aboutsummaryrefslogtreecommitdiffstats
path: root/parse.c
blob: ac51abfbab19ee6e7700cbd1dc8174dd9c287c51 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
/*	$NetBSD: parse.c,v 1.192 2013/10/18 20:47:06 christos Exp $	*/

/*
 * Copyright (c) 1988, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: parse.c,v 1.192 2013/10/18 20:47:06 christos Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)parse.c	8.3 (Berkeley) 3/19/94";
#else
__RCSID("$NetBSD: parse.c,v 1.192 2013/10/18 20:47:06 christos Exp $");
#endif
#endif /* not lint */
#endif

/*-
 * parse.c --
 *	Functions to parse a makefile.
 *
 *	One function, Parse_Init, must be called before any functions
 *	in this module are used. After that, the function Parse_File is the
 *	main entry point and controls most of the other functions in this
 *	module.
 *
 *	Most important structures are kept in Lsts. Directories for
 *	the .include "..." function are kept in the 'parseIncPath' Lst, while
 *	those for the .include <...> are kept in the 'sysIncPath' Lst. The
 *	targets currently being defined are kept in the 'targets' Lst.
 *
 *	The variables 'fname' and 'lineno' are used to track the name
 *	of the current file and the line number in that file so that error
 *	messages can be more meaningful.
 *
 * Interface:
 *	Parse_Init	    	    Initialization function which must be
 *	    	  	    	    called before anything else in this module
 *	    	  	    	    is used.
 *
 *	Parse_End		    Cleanup the module
 *
 *	Parse_File	    	    Function used to parse a makefile. It must
 *	    	  	    	    be given the name of the file, which should
 *	    	  	    	    already have been opened, and a function
 *	    	  	    	    to call to read a character from the file.
 *
 *	Parse_IsVar	    	    Returns TRUE if the given line is a
 *	    	  	    	    variable assignment. Used by MainParseArgs
 *	    	  	    	    to determine if an argument is a target
 *	    	  	    	    or a variable assignment. Used internally
 *	    	  	    	    for pretty much the same thing...
 *
 *	Parse_Error	    	    Function called when an error occurs in
 *	    	  	    	    parsing. Used by the variable and
 *	    	  	    	    conditional modules.
 *	Parse_MainName	    	    Returns a Lst of the main target to create.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>

#include "make.h"
#include "hash.h"
#include "dir.h"
#include "job.h"
#include "buf.h"
#include "pathnames.h"

#ifdef HAVE_MMAP
#include <sys/mman.h>

#ifndef MAP_COPY
#define MAP_COPY MAP_PRIVATE
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#endif

////////////////////////////////////////////////////////////
// types and constants

/*
 * Structure for a file being read ("included file")
 */
typedef struct IFile {
    char      	    *fname;         /* name of file */
    int             lineno;         /* current line number in file */
    int             first_lineno;   /* line number of start of text */
    int             cond_depth;     /* 'if' nesting when file opened */
    char            *P_str;         /* point to base of string buffer */
    char            *P_ptr;         /* point to next char of string buffer */
    char            *P_end;         /* point to the end of string buffer */
    char            *(*nextbuf)(void *, size_t *); /* Function to get more data */
    void            *nextbuf_arg;   /* Opaque arg for nextbuf() */
    struct loadedfile *lf;          /* loadedfile object, if any */
} IFile;


/*
 * These values are returned by ParseEOF to tell Parse_File whether to
 * CONTINUE parsing, i.e. it had only reached the end of an include file,
 * or if it's DONE.
 */
#define CONTINUE	1
#define DONE		0

/*
 * Tokens for target attributes
 */
typedef enum {
    Begin,  	    /* .BEGIN */
    Default,	    /* .DEFAULT */
    End,    	    /* .END */
    dotError,	    /* .ERROR */
    Ignore,	    /* .IGNORE */
    Includes,	    /* .INCLUDES */
    Interrupt,	    /* .INTERRUPT */
    Libs,	    /* .LIBS */
    Meta,	    /* .META */
    MFlags,	    /* .MFLAGS or .MAKEFLAGS */
    Main,	    /* .MAIN and we don't have anything user-specified to
		     * make */
    NoExport,	    /* .NOEXPORT */
    NoMeta,	    /* .NOMETA */
    NoMetaCmp,	    /* .NOMETA_CMP */
    NoPath,	    /* .NOPATH */
    Not,	    /* Not special */
    NotParallel,    /* .NOTPARALLEL */
    Null,   	    /* .NULL */
    ExObjdir,	    /* .OBJDIR */
    Order,  	    /* .ORDER */
    Parallel,	    /* .PARALLEL */
    ExPath,	    /* .PATH */
    Phony,	    /* .PHONY */
#ifdef POSIX
    Posix,	    /* .POSIX */
#endif
    Precious,	    /* .PRECIOUS */
    ExShell,	    /* .SHELL */
    Silent,	    /* .SILENT */
    SingleShell,    /* .SINGLESHELL */
    Stale,	    /* .STALE */
    Suffixes,	    /* .SUFFIXES */
    Wait,	    /* .WAIT */
    Attribute	    /* Generic attribute */
} ParseSpecial;

/*
 * Other tokens
 */
#define LPAREN	'('
#define RPAREN	')'


////////////////////////////////////////////////////////////
// result data

/*
 * The main target to create. This is the first target on the first
 * dependency line in the first makefile.
 */
static GNode *mainNode;

////////////////////////////////////////////////////////////
// eval state

/* targets we're working on */
static Lst targets;

#ifdef CLEANUP
/* command lines for targets */
static Lst targCmds;
#endif

/*
 * specType contains the SPECial TYPE of the current target. It is
 * Not if the target is unspecial. If it *is* special, however, the children
 * are linked as children of the parent but not vice versa. This variable is
 * set in ParseDoDependency
 */
static ParseSpecial specType;

/*
 * Predecessor node for handling .ORDER. Initialized to NULL when .ORDER
 * seen, then set to each successive source on the line.
 */
static GNode	*predecessor;

////////////////////////////////////////////////////////////
// parser state

/* true if currently in a dependency line or its commands */
static Boolean inLine;

/* number of fatal errors */
static int fatals = 0;

/*
 * Variables for doing includes
 */

/* current file being read */
static IFile *curFile;

/* stack of IFiles generated by .includes */
static Lst includes;

/* include paths (lists of directories) */
Lst parseIncPath;	/* dirs for "..." includes */
Lst sysIncPath;		/* dirs for <...> includes */
Lst defIncPath;		/* default for sysIncPath */

////////////////////////////////////////////////////////////
// parser tables

/*
 * The parseKeywords table is searched using binary search when deciding
 * if a target or source is special. The 'spec' field is the ParseSpecial
 * type of the keyword ("Not" if the keyword isn't special as a target) while
 * the 'op' field is the operator to apply to the list of targets if the
 * keyword is used as a source ("0" if the keyword isn't special as a source)
 */
static const struct {
    const char   *name;    	/* Name of keyword */
    ParseSpecial  spec;	    	/* Type when used as a target */
    int	    	  op;	    	/* Operator when used as a source */
} parseKeywords[] = {
{ ".BEGIN", 	  Begin,    	0 },
{ ".DEFAULT",	  Default,  	0 },
{ ".END",   	  End,	    	0 },
{ ".ERROR",   	  dotError,    	0 },
{ ".EXEC",	  Attribute,   	OP_EXEC },
{ ".IGNORE",	  Ignore,   	OP_IGNORE },
{ ".INCLUDES",	  Includes, 	0 },
{ ".INTERRUPT",	  Interrupt,	0 },
{ ".INVISIBLE",	  Attribute,   	OP_INVISIBLE },
{ ".JOIN",  	  Attribute,   	OP_JOIN },
{ ".LIBS",  	  Libs,	    	0 },
{ ".MADE",	  Attribute,	OP_MADE },
{ ".MAIN",	  Main,		0 },
{ ".MAKE",  	  Attribute,   	OP_MAKE },
{ ".MAKEFLAGS",	  MFlags,   	0 },
{ ".META",	  Meta,		OP_META },
{ ".MFLAGS",	  MFlags,   	0 },
{ ".NOMETA",	  NoMeta,	OP_NOMETA },
{ ".NOMETA_CMP",  NoMetaCmp,	OP_NOMETA_CMP },
{ ".NOPATH",	  NoPath,	OP_NOPATH },
{ ".NOTMAIN",	  Attribute,   	OP_NOTMAIN },
{ ".NOTPARALLEL", NotParallel,	0 },
{ ".NO_PARALLEL", NotParallel,	0 },
{ ".NULL",  	  Null,	    	0 },
{ ".OBJDIR",	  ExObjdir,	0 },
{ ".OPTIONAL",	  Attribute,   	OP_OPTIONAL },
{ ".ORDER", 	  Order,    	0 },
{ ".PARALLEL",	  Parallel,	0 },
{ ".PATH",	  ExPath,	0 },
{ ".PHONY",	  Phony,	OP_PHONY },
#ifdef POSIX
{ ".POSIX",	  Posix,	0 },
#endif
{ ".PRECIOUS",	  Precious, 	OP_PRECIOUS },
{ ".RECURSIVE",	  Attribute,	OP_MAKE },
{ ".SHELL", 	  ExShell,    	0 },
{ ".SILENT",	  Silent,   	OP_SILENT },
{ ".SINGLESHELL", SingleShell,	0 },
{ ".STALE",	  Stale,	0 },
{ ".SUFFIXES",	  Suffixes, 	0 },
{ ".USE",   	  Attribute,   	OP_USE },
{ ".USEBEFORE",   Attribute,   	OP_USEBEFORE },
{ ".WAIT",	  Wait, 	0 },
};

////////////////////////////////////////////////////////////
// local functions

static int ParseIsEscaped(const char *, const char *);
static void ParseErrorInternal(const char *, size_t, int, const char *, ...)
    MAKE_ATTR_PRINTFLIKE(4,5);
static void ParseVErrorInternal(FILE *, const char *, size_t, int, const char *, va_list)
    MAKE_ATTR_PRINTFLIKE(5, 0);
static int ParseFindKeyword(const char *);
static int ParseLinkSrc(void *, void *);
static int ParseDoOp(void *, void *);
static void ParseDoSrc(int, const char *);
static int ParseFindMain(void *, void *);
static int ParseAddDir(void *, void *);
static int ParseClearPath(void *, void *);
static void ParseDoDependency(char *);
static int ParseAddCmd(void *, void *);
static void ParseHasCommands(void *);
static void ParseDoInclude(char *);
static void ParseSetParseFile(const char *);
#ifdef SYSVINCLUDE
static void ParseTraditionalInclude(char *);
#endif
#ifdef GMAKEEXPORT
static void ParseGmakeExport(char *);
#endif
static int ParseEOF(void);
static char *ParseReadLine(void);
static void ParseFinishLine(void);
static void ParseMark(GNode *);

////////////////////////////////////////////////////////////
// file loader

struct loadedfile {
	const char *path;		/* name, for error reports */
	char *buf;			/* contents buffer */
	size_t len;			/* length of contents */
	size_t maplen;			/* length of mmap area, or 0 */
	Boolean used;			/* XXX: have we used the data yet */
};

/*
 * Constructor/destructor for loadedfile
 */
static struct loadedfile *
loadedfile_create(const char *path)
{
	struct loadedfile *lf;

	lf = bmake_malloc(sizeof(*lf));
	lf->path = (path == NULL ? "(stdin)" : path);
	lf->buf = NULL;
	lf->len = 0;
	lf->maplen = 0;
	lf->used = FALSE;
	return lf;
}

static void
loadedfile_destroy(struct loadedfile *lf)
{
	if (lf->buf != NULL) {
		if (lf->maplen > 0) {
#ifdef HAVE_MMAP
			munmap(lf->buf, lf->maplen);
#endif
		} else {
			free(lf->buf);
		}
	}
	free(lf);
}

/*
 * nextbuf() operation for loadedfile, as needed by the weird and twisted
 * logic below. Once that's cleaned up, we can get rid of lf->used...
 */
static char *
loadedfile_nextbuf(void *x, size_t *len)
{
	struct loadedfile *lf = x;

	if (lf->used) {
		return NULL;
	}
	lf->used = TRUE;
	*len = lf->len;
	return lf->buf;
}

/*
 * Try to get the size of a file.
 */
static ReturnStatus
load_getsize(int fd, size_t *ret)
{
	struct stat st;

	if (fstat(fd, &st) < 0) {
		return FAILURE;
	}

	if (!S_ISREG(st.st_mode)) {
		return FAILURE;
	}

	/*
	 * st_size is an off_t, which is 64 bits signed; *ret is
	 * size_t, which might be 32 bits unsigned or 64 bits
	 * unsigned. Rather than being elaborate, just punt on
	 * files that are more than 2^31 bytes. We should never
	 * see a makefile that size in practice...
	 *
	 * While we're at it reject negative sizes too, just in case.
	 */
	if (st.st_size < 0 || st.st_size > 0x7fffffff) {
		return FAILURE;
	}

	*ret = (size_t) st.st_size;
	return SUCCESS;
}

/*
 * Read in a file.
 *
 * Until the path search logic can be moved under here instead of
 * being in the caller in another source file, we need to have the fd
 * passed in already open. Bleh.
 *
 * If the path is NULL use stdin and (to insure against fd leaks)
 * assert that the caller passed in -1.
 */
static struct loadedfile *
loadfile(const char *path, int fd)
{
	struct loadedfile *lf;
#ifdef HAVE_MMAP
	long pagesize;
#endif
	ssize_t result;
	size_t bufpos;

	lf = loadedfile_create(path);

	if (path == NULL) {
		assert(fd == -1);
		fd = STDIN_FILENO;
	} else {
#if 0 /* notyet */
		fd = open(path, O_RDONLY);
		if (fd < 0) {
			...
			Error("%s: %s", path, strerror(errno));
			exit(1);
		}
#endif
	}

#ifdef HAVE_MMAP
	if (load_getsize(fd, &lf->len) == SUCCESS) {
		/* found a size, try mmap */
		pagesize = sysconf(_SC_PAGESIZE);
		if (pagesize <= 0) {
			pagesize = 0x1000;
		}
		/* round size up to a page */
		lf->maplen = pagesize * ((lf->len + pagesize - 1)/pagesize);

		/*
		 * XXX hack for dealing with empty files; remove when
		 * we're no longer limited by interfacing to the old
		 * logic elsewhere in this file.
		 */
		if (lf->maplen == 0) {
			lf->maplen = pagesize;
		}

		/*
		 * FUTURE: remove PROT_WRITE when the parser no longer
		 * needs to scribble on the input.
		 */
		lf->buf = mmap(NULL, lf->maplen, PROT_READ|PROT_WRITE,
			       MAP_FILE|MAP_COPY, fd, 0);
		if (lf->buf != MAP_FAILED) {
			/* succeeded */
			if (lf->len == lf->maplen && lf->buf[lf->len - 1] != '\n') {
				char *b = malloc(lf->len + 1);
				b[lf->len] = '\n';
				memcpy(b, lf->buf, lf->len++);
				munmap(lf->buf, lf->maplen);
				lf->maplen = 0;
				lf->buf = b;
			}
			goto done;
		}
	}
#endif
	/* cannot mmap; load the traditional way */

	lf->maplen = 0;
	lf->len = 1024;
	lf->buf = bmake_malloc(lf->len);

	bufpos = 0;
	while (1) {
		assert(bufpos <= lf->len);
		if (bufpos == lf->len) {
			lf->len *= 2;
			lf->buf = bmake_realloc(lf->buf, lf->len);
		}
		result = read(fd, lf->buf + bufpos, lf->len - bufpos);
		if (result < 0) {
			Error("%s: read error: %s", path, strerror(errno));
			exit(1);
		}
		if (result == 0) {
			break;
		}
		bufpos += result;
	}
	assert(bufpos <= lf->len);
	lf->len = bufpos;

	/* truncate malloc region to actual length (maybe not useful) */
	if (lf->len > 0) {
		lf->buf = bmake_realloc(lf->buf, lf->len);
	}

#ifdef HAVE_MMAP
done:
#endif
	if (path != NULL) {
		close(fd);
	}
	return lf;
}

////////////////////////////////////////////////////////////
// old code

/*-
 *----------------------------------------------------------------------
 * ParseIsEscaped --
 *	Check if the current character is escaped on the current line
 *
 * Results:
 *	0 if the character is not backslash escaped, 1 otherwise
 *
 * Side Effects:
 *	None
 *----------------------------------------------------------------------
 */
static int
ParseIsEscaped(const char *line, const char *c)
{
    int active = 0;
    for (;;) {
	if (line == c)
	    return active;
	if (*--c != '\\')
	    return active;
	active = !active;
    }
}

/*-
 *----------------------------------------------------------------------
 * ParseFindKeyword --
 *	Look in the table of keywords for one matching the given string.
 *
 * Input:
 *	str		String to find
 *
 * Results:
 *	The index of the keyword, or -1 if it isn't there.
 *
 * Side Effects:
 *	None
 *----------------------------------------------------------------------
 */
static int
ParseFindKeyword(const char *str)
{
    int    start, end, cur;
    int    diff;

    start = 0;
    end = (sizeof(parseKeywords)/sizeof(parseKeywords[0])) - 1;

    do {
	cur = start + ((end - start) / 2);
	diff = strcmp(str, parseKeywords[cur].name);

	if (diff == 0) {
	    return (cur);
	} else if (diff < 0) {
	    end = cur - 1;
	} else {
	    start = cur + 1;
	}
    } while (start <= end);
    return (-1);
}

/*-
 * ParseVErrorInternal  --
 *	Error message abort function for parsing. Prints out the context
 *	of the error (line number and file) as well as the message with
 *	two optional arguments.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	"fatals" is incremented if the level is PARSE_FATAL.
 */
/* VARARGS */
static void
ParseVErrorInternal(FILE *f, const char *cfname, size_t clineno, int type,
    const char *fmt, va_list ap)
{
	static Boolean fatal_warning_error_printed = FALSE;

	(void)fprintf(f, "%s: ", progname);

	if (cfname != NULL) {
		(void)fprintf(f, "\"");
		if (*cfname != '/' && strcmp(cfname, "(stdin)") != 0) {
			char *cp;
			const char *dir;

			/*
			 * Nothing is more annoying than not knowing
			 * which Makefile is the culprit.
			 */
			dir = Var_Value(".PARSEDIR", VAR_GLOBAL, &cp);
			if (dir == NULL || *dir == '\0' ||
			    (*dir == '.' && dir[1] == '\0'))
				dir = Var_Value(".CURDIR", VAR_GLOBAL, &cp);
			if (dir == NULL)
				dir = ".";

			(void)fprintf(f, "%s/%s", dir, cfname);
		} else
			(void)fprintf(f, "%s", cfname);

		(void)fprintf(f, "\" line %d: ", (int)clineno);
	}
	if (type == PARSE_WARNING)
		(void)fprintf(f, "warning: ");
	(void)vfprintf(f, fmt, ap);
	(void)fprintf(f, "\n");
	(void)fflush(f);
	if (type == PARSE_FATAL || parseWarnFatal)
		fatals += 1;
	if (parseWarnFatal && !fatal_warning_error_printed) {
		Error("parsing warnings being treated as errors");
		fatal_warning_error_printed = TRUE;
	}
}

/*-
 * ParseErrorInternal  --
 *	Error function
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	None
 */
/* VARARGS */
static void
ParseErrorInternal(const char *cfname, size_t clineno, int type,
    const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	(void)fflush(stdout);
	ParseVErrorInternal(stderr, cfname, clineno, type, fmt, ap);
	va_end(ap);

	if (debug_file != stderr && debug_file != stdout) {
		va_start(ap, fmt);
		ParseVErrorInternal(debug_file, cfname, clineno, type, fmt, ap);
		va_end(ap);
	}
}

/*-
 * Parse_Error  --
 *	External interface to ParseErrorInternal; uses the default filename
 *	Line number.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	None
 */
/* VARARGS */
void
Parse_Error(int type, const char *fmt, ...)
{
	va_list ap;
	const char *fname;
	size_t lineno;

	if (curFile == NULL) {
		fname = NULL;
		lineno = 0;
	} else {
		fname = curFile->fname;
		lineno = curFile->lineno;
	}

	va_start(ap, fmt);
	(void)fflush(stdout);
	ParseVErrorInternal(stderr, fname, lineno, type, fmt, ap);
	va_end(ap);

	if (debug_file != stderr && debug_file != stdout) {
		va_start(ap, fmt);
		ParseVErrorInternal(debug_file, fname, lineno, type, fmt, ap);
		va_end(ap);
	}
}


/*
 * ParseMessage
 *	Parse a .info .warning or .error directive
 *
 *	The input is the line minus the ".".  We substitute
 *	variables, print the message and exit(1) (for .error) or just print
 *	a warning if the directive is malformed.
 */
static Boolean
ParseMessage(char *line)
{
    int mtype;

    switch(*line) {
    case 'i':
	mtype = 0;
	break;
    case 'w':
	mtype = PARSE_WARNING;
	break;
    case 'e':
	mtype = PARSE_FATAL;
	break;
    default:
	Parse_Error(PARSE_WARNING, "invalid syntax: \".%s\"", line);
	return FALSE;
    }

    while (isalpha((u_char)*line))
	line++;
    if (!isspace((u_char)*line))
	return FALSE;			/* not for us */
    while (isspace((u_char)*line))
	line++;

    line = Var_Subst(NULL, line, VAR_CMD, 0);
    Parse_Error(mtype, "%s", line);
    free(line);

    if (mtype == PARSE_FATAL) {
	/* Terminate immediately. */
	exit(1);
    }
    return TRUE;
}

/*-
 *---------------------------------------------------------------------
 * ParseLinkSrc  --
 *	Link the parent node to its new child. Used in a Lst_ForEach by
 *	ParseDoDependency. If the specType isn't 'Not', the parent
 *	isn't linked as a parent of the child.
 *
 * Input:
 *	pgnp		The parent node
 *	cgpn		The child node
 *
 * Results:
 *	Always = 0
 *
 * Side Effects:
 *	New elements are added to the parents list of cgn and the
 *	children list of cgn. the unmade field of pgn is updated
 *	to reflect the additional child.
 *---------------------------------------------------------------------
 */
static int
ParseLinkSrc(void *pgnp, void *cgnp)
{
    GNode          *pgn = (GNode *)pgnp;
    GNode          *cgn = (GNode *)cgnp;

    if ((pgn->type & OP_DOUBLEDEP) && !Lst_IsEmpty (pgn->cohorts))
	pgn = (GNode *)Lst_Datum(Lst_Last(pgn->cohorts));
    (void)Lst_AtEnd(pgn->children, cgn);
    if (specType == Not)
	    (void)Lst_AtEnd(cgn->parents, pgn);
    pgn->unmade += 1;
    if (DEBUG(PARSE)) {
	fprintf(debug_file, "# ParseLinkSrc: added child %s - %s\n", pgn->name, cgn->name);
	Targ_PrintNode(pgn, 0);
	Targ_PrintNode(cgn, 0);
    }
    return (0);
}

/*-
 *---------------------------------------------------------------------
 * ParseDoOp  --
 *	Apply the parsed operator to the given target node. Used in a
 *	Lst_ForEach call by ParseDoDependency once all targets have
 *	been found and their operator parsed. If the previous and new
 *	operators are incompatible, a major error is taken.
 *
 * Input:
 *	gnp		The node to which the operator is to be applied
 *	opp		The operator to apply
 *
 * Results:
 *	Always 0
 *
 * Side Effects:
 *	The type field of the node is altered to reflect any new bits in
 *	the op.
 *---------------------------------------------------------------------
 */
static int
ParseDoOp(void *gnp, void *opp)
{
    GNode          *gn = (GNode *)gnp;
    int             op = *(int *)opp;
    /*
     * If the dependency mask of the operator and the node don't match and
     * the node has actually had an operator applied to it before, and
     * the operator actually has some dependency information in it, complain.
     */
    if (((op & OP_OPMASK) != (gn->type & OP_OPMASK)) &&
	!OP_NOP(gn->type) && !OP_NOP(op))
    {
	Parse_Error(PARSE_FATAL, "Inconsistent operator for %s", gn->name);
	return (1);
    }

    if ((op == OP_DOUBLEDEP) && ((gn->type & OP_OPMASK) == OP_DOUBLEDEP)) {
	/*
	 * If the node was the object of a :: operator, we need to create a
	 * new instance of it for the children and commands on this dependency
	 * line. The new instance is placed on the 'cohorts' list of the
	 * initial one (note the initial one is not on its own cohorts list)
	 * and the new instance is linked to all parents of the initial
	 * instance.
	 */
	GNode	*cohort;

	/*
	 * Propagate copied bits to the initial node.  They'll be propagated
	 * back to the rest of the cohorts later.
	 */
	gn->type |= op & ~OP_OPMASK;

	cohort = Targ_FindNode(gn->name, TARG_NOHASH);
	if (doing_depend)
	    ParseMark(cohort);
	/*
	 * Make the cohort invisible as well to avoid duplicating it into
	 * other variables. True, parents of this target won't tend to do
	 * anything with their local variables, but better safe than
	 * sorry. (I think this is pointless now, since the relevant list
	 * traversals will no longer see this node anyway. -mycroft)
	 */
	cohort->type = op | OP_INVISIBLE;
	(void)Lst_AtEnd(gn->cohorts, cohort);
	cohort->centurion = gn;
	gn->unmade_cohorts += 1;
	snprintf(cohort->cohort_num, sizeof cohort->cohort_num, "#%d",
		gn->unmade_cohorts);
    } else {
	/*
	 * We don't want to nuke any previous flags (whatever they were) so we
	 * just OR the new operator into the old
	 */
	gn->type |= op;
    }

    return (0);
}

/*-
 *---------------------------------------------------------------------
 * ParseDoSrc  --
 *	Given the name of a source, figure out if it is an attribute
 *	and apply it to the targets if it is. Else decide if there is
 *	some attribute which should be applied *to* the source because
 *	of some special target and apply it if so. Otherwise, make the
 *	source be a child of the targets in the list 'targets'
 *
 * Input:
 *	tOp		operator (if any) from special targets
 *	src		name of the source to handle
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	Operator bits may be added to the list of targets or to the source.
 *	The targets may have a new source added to their lists of children.
 *---------------------------------------------------------------------
 */
static void
ParseDoSrc(int tOp, const char *src)
{
    GNode	*gn = NULL;
    static int wait_number = 0;
    char wait_src[16];

    if (*src == '.' && isupper ((unsigned char)src[1])) {
	int keywd = ParseFindKeyword(src);
	if (keywd != -1) {
	    int op = parseKeywords[keywd].op;
	    if (op != 0) {
		Lst_ForEach(targets, ParseDoOp, &op);
		return;
	    }
	    if (parseKeywords[keywd].spec == Wait) {
		/*
		 * We add a .WAIT node in the dependency list.
		 * After any dynamic dependencies (and filename globbing)
		 * have happened, it is given a dependency on the each
		 * previous child back to and previous .WAIT node.
		 * The next child won't be scheduled until the .WAIT node
		 * is built.
		 * We give each .WAIT node a unique name (mainly for diag).
		 */
		snprintf(wait_src, sizeof wait_src, ".WAIT_%u", ++wait_number);
		gn = Targ_FindNode(wait_src, TARG_NOHASH);
		if (doing_depend)
		    ParseMark(gn);
		gn->type = OP_WAIT | OP_PHONY | OP_DEPENDS | OP_NOTMAIN;
		Lst_ForEach(targets, ParseLinkSrc, gn);
		return;
	    }
	}
    }

    switch (specType) {
    case Main:
	/*
	 * If we have noted the existence of a .MAIN, it means we need
	 * to add the sources of said target to the list of things
	 * to create. The string 'src' is likely to be free, so we
	 * must make a new copy of it. Note that this will only be
	 * invoked if the user didn't specify a target on the command
	 * line. This is to allow #ifmake's to succeed, or something...
	 */
	(void)Lst_AtEnd(create, bmake_strdup(src));
	/*
	 * Add the name to the .TARGETS variable as well, so the user can
	 * employ that, if desired.
	 */
	Var_Append(".TARGETS", src, VAR_GLOBAL);
	return;

    case Order:
	/*
	 * Create proper predecessor/successor links between the previous
	 * source and the current one.
	 */
	gn = Targ_FindNode(src, TARG_CREATE);
	if (doing_depend)
	    ParseMark(gn);
	if (predecessor != NULL) {
	    (void)Lst_AtEnd(predecessor->order_succ, gn);
	    (void)Lst_AtEnd(gn->order_pred, predecessor);
	    if (DEBUG(PARSE)) {
		fprintf(debug_file, "# ParseDoSrc: added Order dependency %s - %s\n",
			predecessor->name, gn->name);
		Targ_PrintNode(predecessor, 0);
		Targ_PrintNode(gn, 0);
	    }
	}
	/*
	 * The current source now becomes the predecessor for the next one.
	 */
	predecessor = gn;
	break;

    default:
	/*
	 * If the source is not an attribute, we need to find/create
	 * a node for it. After that we can apply any operator to it
	 * from a special target or link it to its parents, as
	 * appropriate.
	 *
	 * In the case of a source that was the object of a :: operator,
	 * the attribute is applied to all of its instances (as kept in
	 * the 'cohorts' list of the node) or all the cohorts are linked
	 * to all the targets.
	 */

	/* Find/create the 'src' node and attach to all targets */
	gn = Targ_FindNode(src, TARG_CREATE);
	if (doing_depend)
	    ParseMark(gn);
	if (tOp) {
	    gn->type |= tOp;
	} else {
	    Lst_ForEach(targets, ParseLinkSrc, gn);
	}
	break;
    }
}

/*-
 *-----------------------------------------------------------------------
 * ParseFindMain --
 *	Find a real target in the list and set it to be the main one.
 *	Called by ParseDoDependency when a main target hasn't been found
 *	yet.
 *
 * Input:
 *	gnp		Node to examine
 *
 * Results:
 *	0 if main not found yet, 1 if it is.
 *
 * Side Effects:
 *	mainNode is changed and Targ_SetMain is called.
 *
 *-----------------------------------------------------------------------
 */
static int
ParseFindMain(void *gnp, void *dummy)
{
    GNode   	  *gn = (GNode *)gnp;
    if ((gn->type & OP_NOTARGET) == 0) {
	mainNode = gn;
	Targ_SetMain(gn);
	return (dummy ? 1 : 1);
    } else {
	return (dummy ? 0 : 0);
    }
}

/*-
 *-----------------------------------------------------------------------
 * ParseAddDir --
 *	Front-end for Dir_AddDir to make sure Lst_ForEach keeps going
 *
 * Results:
 *	=== 0
 *
 * Side Effects:
 *	See Dir_AddDir.
 *
 *-----------------------------------------------------------------------
 */
static int
ParseAddDir(void *path, void *name)
{
    (void)Dir_AddDir((Lst) path, (char *)name);
    return(0);
}

/*-
 *-----------------------------------------------------------------------
 * ParseClearPath --
 *	Front-end for Dir_ClearPath to make sure Lst_ForEach keeps going
 *
 * Results:
 *	=== 0
 *
 * Side Effects:
 *	See Dir_ClearPath
 *
 *-----------------------------------------------------------------------
 */
static int
ParseClearPath(void *path, void *dummy)
{
    Dir_ClearPath((Lst) path);
    return(dummy ? 0 : 0);
}

/*-
 *---------------------------------------------------------------------
 * ParseDoDependency  --
 *	Parse the dependency line in line.
 *
 * Input:
 *	line		the line to parse
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	The nodes of the sources are linked as children to the nodes of the
 *	targets. Some nodes may be created.
 *
 *	We parse a dependency line by first extracting words from the line and
 * finding nodes in the list of all targets with that name. This is done
 * until a character is encountered which is an operator character. Currently
 * these are only ! and :. At this point the operator is parsed and the
 * pointer into the line advanced until the first source is encountered.
 * 	The parsed operator is applied to each node in the 'targets' list,
 * which is where the nodes found for the targets are kept, by means of
 * the ParseDoOp function.
 *	The sources are read in much the same way as the targets were except
 * that now they are expanded using the wildcarding scheme of the C-Shell
 * and all instances of the resulting words in the list of all targets
 * are found. Each of the resulting nodes is then linked to each of the
 * targets as one of its children.
 *	Certain targets are handled specially. These are the ones detailed
 * by the specType variable.
 *	The storing of transformation rules is also taken care of here.
 * A target is recognized as a transformation rule by calling
 * Suff_IsTransform. If it is a transformation rule, its node is gotten
 * from the suffix module via Suff_AddTransform rather than the standard
 * Targ_FindNode in the target module.
 *---------------------------------------------------------------------
 */
static void
ParseDoDependency(char *line)
{
    char  	   *cp;		/* our current position */
    GNode 	   *gn = NULL;	/* a general purpose temporary node */
    int             op;		/* the operator on the line */
    char            savec;	/* a place to save a character */
    Lst    	    paths;   	/* List of search paths to alter when parsing
				 * a list of .PATH targets */
    int	    	    tOp;    	/* operator from special target */
    Lst	    	    sources;	/* list of archive source names after
				 * expansion */
    Lst 	    curTargs;	/* list of target names to be found and added
				 * to the targets list */
    char	   *lstart = line;

    if (DEBUG(PARSE))
	fprintf(debug_file, "ParseDoDependency(%s)\n", line);
    tOp = 0;

    specType = Not;
    paths = NULL;

    curTargs = Lst_Init(FALSE);

    do {
	for (cp = line; *cp && (ParseIsEscaped(lstart, cp) ||
		     !(isspace((unsigned char)*cp) ||
			 *cp == '!' || *cp == ':' || *cp == LPAREN));
		 cp++) {
	    if (*cp == '$') {
		/*
		 * Must be a dynamic source (would have been expanded
		 * otherwise), so call the Var module to parse the puppy
		 * so we can safely advance beyond it...There should be
		 * no errors in this, as they would have been discovered
		 * in the initial Var_Subst and we wouldn't be here.
		 */
		int 	length;
		void    *freeIt;

		(void)Var_Parse(cp, VAR_CMD, TRUE, &length, &freeIt);
		if (freeIt)
		    free(freeIt);
		cp += length-1;
	    }
	}

	if (!ParseIsEscaped(lstart, cp) && *cp == LPAREN) {
	    /*
	     * Archives must be handled specially to make sure the OP_ARCHV
	     * flag is set in their 'type' field, for one thing, and because
	     * things like "archive(file1.o file2.o file3.o)" are permissible.
	     * Arch_ParseArchive will set 'line' to be the first non-blank
	     * after the archive-spec. It creates/finds nodes for the members
	     * and places them on the given list, returning SUCCESS if all
	     * went well and FAILURE if there was an error in the
	     * specification. On error, line should remain untouched.
	     */
	    if (Arch_ParseArchive(&line, targets, VAR_CMD) != SUCCESS) {
		Parse_Error(PARSE_FATAL,
			     "Error in archive specification: \"%s\"", line);
		goto out;
	    } else {
		continue;
	    }
	}
	savec = *cp;

	if (!*cp) {
	    /*
	     * Ending a dependency line without an operator is a Bozo
	     * no-no.  As a heuristic, this is also often triggered by
	     * undetected conflicts from cvs/rcs merges.
	     */
	    if ((strncmp(line, "<<<<<<", 6) == 0) ||
		(strncmp(line, "======", 6) == 0) ||
		(strncmp(line, ">>>>>>", 6) == 0))
		Parse_Error(PARSE_FATAL,
		    "Makefile appears to contain unresolved cvs/rcs/??? merge conflicts");
	    else
		Parse_Error(PARSE_FATAL, lstart[0] == '.' ? "Unknown directive"
				     : "Need an operator");
	    goto out;
	}
	*cp = '\0';

	/*
	 * Have a word in line. See if it's a special target and set
	 * specType to match it.
	 */
	if (*line == '.' && isupper ((unsigned char)line[1])) {
	    /*
	     * See if the target is a special target that must have it
	     * or its sources handled specially.
	     */
	    int keywd = ParseFindKeyword(line);
	    if (keywd != -1) {
		if (specType == ExPath && parseKeywords[keywd].spec != ExPath) {
		    Parse_Error(PARSE_FATAL, "Mismatched special targets");
		    goto out;
		}

		specType = parseKeywords[keywd].spec;
		tOp = parseKeywords[keywd].op;

		/*
		 * Certain special targets have special semantics:
		 *	.PATH		Have to set the dirSearchPath
		 *			variable too
		 *	.MAIN		Its sources are only used if
		 *			nothing has been specified to
		 *			create.
		 *	.DEFAULT    	Need to create a node to hang
		 *			commands on, but we don't want
		 *			it in the graph, nor do we want
		 *			it to be the Main Target, so we
		 *			create it, set OP_NOTMAIN and
		 *			add it to the list, setting
		 *			DEFAULT to the new node for
		 *			later use. We claim the node is
		 *	    	    	A transformation rule to make
		 *	    	    	life easier later, when we'll
		 *	    	    	use Make_HandleUse to actually
		 *	    	    	apply the .DEFAULT commands.
		 *	.PHONY		The list of targets
		 *	.NOPATH		Don't search for file in the path
		 *	.STALE
		 *	.BEGIN
		 *	.END
		 *	.ERROR
		 *	.INTERRUPT  	Are not to be considered the
		 *			main target.
		 *  	.NOTPARALLEL	Make only one target at a time.
		 *  	.SINGLESHELL	Create a shell for each command.
		 *  	.ORDER	    	Must set initial predecessor to NULL
		 */
		switch (specType) {
		case ExPath:
		    if (paths == NULL) {
			paths = Lst_Init(FALSE);
		    }
		    (void)Lst_AtEnd(paths, dirSearchPath);
		    break;
		case Main:
		    if (!Lst_IsEmpty(create)) {
			specType = Not;
		    }
		    break;
		case Begin:
		case End:
		case Stale:
		case dotError:
		case Interrupt:
		    gn = Targ_FindNode(line, TARG_CREATE);
		    if (doing_depend)
			ParseMark(gn);
		    gn->type |= OP_NOTMAIN|OP_SPECIAL;
		    (void)Lst_AtEnd(targets, gn);
		    break;
		case Default:
		    gn = Targ_NewGN(".DEFAULT");
		    gn->type |= (OP_NOTMAIN|OP_TRANSFORM);
		    (void)Lst_AtEnd(targets, gn);
		    DEFAULT = gn;
		    break;
		case NotParallel:
		    maxJobs = 1;
		    break;
		case SingleShell:
		    compatMake = TRUE;
		    break;
		case Order:
		    predecessor = NULL;
		    break;
		default:
		    break;
		}
	    } else if (strncmp(line, ".PATH", 5) == 0) {
		/*
		 * .PATH<suffix> has to be handled specially.
		 * Call on the suffix module to give us a path to
		 * modify.
		 */
		Lst 	path;

		specType = ExPath;
		path = Suff_GetPath(&line[5]);
		if (path == NULL) {
		    Parse_Error(PARSE_FATAL,
				 "Suffix '%s' not defined (yet)",
				 &line[5]);
		    goto out;
		} else {
		    if (paths == NULL) {
			paths = Lst_Init(FALSE);
		    }
		    (void)Lst_AtEnd(paths, path);
		}
	    }
	}

	/*
	 * Have word in line. Get or create its node and stick it at
	 * the end of the targets list
	 */
	if ((specType == Not) && (*line != '\0')) {
	    if (Dir_HasWildcards(line)) {
		/*
		 * Targets are to be sought only in the current directory,
		 * so create an empty path for the thing. Note we need to
		 * use Dir_Destroy in the destruction of the path as the
		 * Dir module could have added a directory to the path...
		 */
		Lst	    emptyPath = Lst_Init(FALSE);

		Dir_Expand(line, emptyPath, curTargs);

		Lst_Destroy(emptyPath, Dir_Destroy);
	    } else {
		/*
		 * No wildcards, but we want to avoid code duplication,
		 * so create a list with the word on it.
		 */
		(void)Lst_AtEnd(curTargs, line);
	    }

	    while(!Lst_IsEmpty(curTargs)) {
		char	*targName = (char *)Lst_DeQueue(curTargs);

		if (!Suff_IsTransform (targName)) {
		    gn = Targ_FindNode(targName, TARG_CREATE);
		} else {
		    gn = Suff_AddTransform(targName);
		}
		if (doing_depend)
		    ParseMark(gn);

		(void)Lst_AtEnd(targets, gn);
	    }
	} else if (specType == ExPath && *line != '.' && *line != '\0') {
	    Parse_Error(PARSE_WARNING, "Extra target (%s) ignored", line);
	}

	*cp = savec;
	/*
	 * If it is a special type and not .PATH, it's the only target we
	 * allow on this line...
	 */
	if (specType != Not && specType != ExPath) {
	    Boolean warning = FALSE;

	    while (*cp && (ParseIsEscaped(lstart, cp) ||
		((*cp != '!') && (*cp != ':')))) {
		if (ParseIsEscaped(lstart, cp) ||
		    (*cp != ' ' && *cp != '\t')) {
		    warning = TRUE;
		}
		cp++;
	    }
	    if (warning) {
		Parse_Error(PARSE_WARNING, "Extra target ignored");
	    }
	} else {
	    while (*cp && isspace ((unsigned char)*cp)) {
		cp++;
	    }
	}
	line = cp;
    } while (*line && (ParseIsEscaped(lstart, line) ||
	((*line != '!') && (*line != ':'))));

    /*
     * Don't need the list of target names anymore...
     */
    Lst_Destroy(curTargs, NULL);
    curTargs = NULL;

    if (!Lst_IsEmpty(targets)) {
	switch(specType) {
	    default:
		Parse_Error(PARSE_WARNING, "Special and mundane targets don't mix. Mundane ones ignored");
		break;
	    case Default:
	    case Stale:
	    case Begin:
	    case End:
	    case dotError:
	    case Interrupt:
		/*
		 * These four create nodes on which to hang commands, so
		 * targets shouldn't be empty...
		 */
	    case Not:
		/*
		 * Nothing special here -- targets can be empty if it wants.
		 */
		break;
	}
    }

    /*
     * Have now parsed all the target names. Must parse the operator next. The
     * result is left in  op .
     */
    if (*cp == '!') {
	op = OP_FORCE;
    } else if (*cp == ':') {
	if (cp[1] == ':') {
	    op = OP_DOUBLEDEP;
	    cp++;
	} else {
	    op = OP_DEPENDS;
	}
    } else {
	Parse_Error(PARSE_FATAL, lstart[0] == '.' ? "Unknown directive"
		    : "Missing dependency operator");
	goto out;
    }

    cp++;			/* Advance beyond operator */

    Lst_ForEach(targets, ParseDoOp, &op);

    /*
     * Get to the first source
     */
    while (*cp && isspace ((unsigned char)*cp)) {
	cp++;
    }
    line = cp;

    /*
     * Several special targets take different actions if present with no
     * sources:
     *	a .SUFFIXES line with no sources clears out all old suffixes
     *	a .PRECIOUS line makes all targets precious
     *	a .IGNORE line ignores errors for all targets
     *	a .SILENT line creates silence when making all targets
     *	a .PATH removes all directories from the search path(s).
     */
    if (!*line) {
	switch (specType) {
	    case Suffixes:
		Suff_ClearSuffixes();
		break;
	    case Precious:
		allPrecious = TRUE;
		break;
	    case Ignore:
		ignoreErrors = TRUE;
		break;
	    case Silent:
		beSilent = TRUE;
		break;
	    case ExPath:
		Lst_ForEach(paths, ParseClearPath, NULL);
		Dir_SetPATH();
		break;
#ifdef POSIX
            case Posix:
                Var_Set("%POSIX", "1003.2", VAR_GLOBAL, 0);
                break;
#endif
	    default:
		break;
	}
    } else if (specType == MFlags) {
	/*
	 * Call on functions in main.c to deal with these arguments and
	 * set the initial character to a null-character so the loop to
	 * get sources won't get anything
	 */
	Main_ParseArgLine(line);
	*line = '\0';
    } else if (specType == ExShell) {
	if (Job_ParseShell(line) != SUCCESS) {
	    Parse_Error(PARSE_FATAL, "improper shell specification");
	    goto out;
	}
	*line = '\0';
    } else if ((specType == NotParallel) || (specType == SingleShell)) {
	*line = '\0';
    }

    /*
     * NOW GO FOR THE SOURCES
     */
    if ((specType == Suffixes) || (specType == ExPath) ||
	(specType == Includes) || (specType == Libs) ||
	(specType == Null) || (specType == ExObjdir))
    {
	while (*line) {
	    /*
	     * If the target was one that doesn't take files as its sources
	     * but takes something like suffixes, we take each
	     * space-separated word on the line as a something and deal
	     * with it accordingly.
	     *
	     * If the target was .SUFFIXES, we take each source as a
	     * suffix and add it to the list of suffixes maintained by the
	     * Suff module.
	     *
	     * If the target was a .PATH, we add the source as a directory
	     * to search on the search path.
	     *
	     * If it was .INCLUDES, the source is taken to be the suffix of
	     * files which will be #included and whose search path should
	     * be present in the .INCLUDES variable.
	     *
	     * If it was .LIBS, the source is taken to be the suffix of
	     * files which are considered libraries and whose search path
	     * should be present in the .LIBS variable.
	     *
	     * If it was .NULL, the source is the suffix to use when a file
	     * has no valid suffix.
	     *
	     * If it was .OBJDIR, the source is a new definition for .OBJDIR,
	     * and will cause make to do a new chdir to that path.
	     */
	    while (*cp && !isspace ((unsigned char)*cp)) {
		cp++;
	    }
	    savec = *cp;
	    *cp = '\0';
	    switch (specType) {
		case Suffixes:
		    Suff_AddSuffix(line, &mainNode);
		    break;
		case ExPath:
		    Lst_ForEach(paths, ParseAddDir, line);
		    break;
		case Includes:
		    Suff_AddInclude(line);
		    break;
		case Libs:
		    Suff_AddLib(line);
		    break;
		case Null:
		    Suff_SetNull(line);
		    break;
		case ExObjdir:
		    Main_SetObjdir(line);
		    break;
		default:
		    break;
	    }
	    *cp = savec;
	    if (savec != '\0') {
		cp++;
	    }
	    while (*cp && isspace ((unsigned char)*cp)) {
		cp++;
	    }
	    line = cp;
	}
	if (paths) {
	    Lst_Destroy(paths, NULL);
	}
	if (specType == ExPath)
	    Dir_SetPATH();
    } else {
	while (*line) {
	    /*
	     * The targets take real sources, so we must beware of archive
	     * specifications (i.e. things with left parentheses in them)
	     * and handle them accordingly.
	     */
	    for (; *cp && !isspace ((unsigned char)*cp); cp++) {
		if ((*cp == LPAREN) && (cp > line) && (cp[-1] != '$')) {
		    /*
		     * Only stop for a left parenthesis if it isn't at the
		     * start of a word (that'll be for variable changes
		     * later) and isn't preceded by a dollar sign (a dynamic
		     * source).
		     */
		    break;
		}
	    }

	    if (*cp == LPAREN) {
		sources = Lst_Init(FALSE);
		if (Arch_ParseArchive(&line, sources, VAR_CMD) != SUCCESS) {
		    Parse_Error(PARSE_FATAL,
				 "Error in source archive spec \"%s\"", line);
		    goto out;
		}

		while (!Lst_IsEmpty (sources)) {
		    gn = (GNode *)Lst_DeQueue(sources);
		    ParseDoSrc(tOp, gn->name);
		}
		Lst_Destroy(sources, NULL);
		cp = line;
	    } else {
		if (*cp) {
		    *cp = '\0';
		    cp += 1;
		}

		ParseDoSrc(tOp, line);
	    }
	    while (*cp && isspace ((unsigned char)*cp)) {
		cp++;
	    }
	    line = cp;
	}
    }

    if (mainNode == NULL) {
	/*
	 * If we have yet to decide on a main target to make, in the
	 * absence of any user input, we want the first target on
	 * the first dependency line that is actually a real target
	 * (i.e. isn't a .USE or .EXEC rule) to be made.
	 */
	Lst_ForEach(targets, ParseFindMain, NULL);
    }

out:
    if (curTargs)
	    Lst_Destroy(curTargs, NULL);
}

/*-
 *---------------------------------------------------------------------
 * Parse_IsVar  --
 *	Return TRUE if the passed line is a variable assignment. A variable
 *	assignment consists of a single word followed by optional whitespace
 *	followed by either a += or an = operator.
 *	This function is used both by the Parse_File function and main when
 *	parsing the command-line arguments.
 *
 * Input:
 *	line		the line to check
 *
 * Results:
 *	TRUE if it is. FALSE if it ain't
 *
 * Side Effects:
 *	none
 *---------------------------------------------------------------------
 */
Boolean
Parse_IsVar(char *line)
{
    Boolean wasSpace = FALSE;	/* set TRUE if found a space */
    char ch;
    int level = 0;
#define ISEQOPERATOR(c) \
	(((c) == '+') || ((c) == ':') || ((c) == '?') || ((c) == '!'))

    /*
     * Skip to variable name
     */
    for (;(*line == ' ') || (*line == '\t'); line++)
	continue;

    /* Scan for one of the assignment operators outside a variable expansion */
    while ((ch = *line++) != 0) {
	if (ch == '(' || ch == '{') {
	    level++;
	    continue;
	}
	if (ch == ')' || ch == '}') {
	    level--;
	    continue;
	}
	if (level != 0)
	    continue;
	while (ch == ' ' || ch == '\t') {
	    ch = *line++;
	    wasSpace = TRUE;
	}
#ifdef SUNSHCMD
	if (ch == ':' && strncmp(line, "sh", 2) == 0) {
	    line += 2;
	    continue;
	}
#endif
	if (ch == '=')
	    return TRUE;
	if (*line == '=' && ISEQOPERATOR(ch))
	    return TRUE;
	if (wasSpace)
	    return FALSE;
    }

    return FALSE;
}

/*-
 *---------------------------------------------------------------------
 * Parse_DoVar  --
 *	Take the variable assignment in the passed line and do it in the
 *	global context.
 *
 *	Note: There is a lexical ambiguity with assignment modifier characters
 *	in variable names. This routine interprets the character before the =
 *	as a modifier. Therefore, an assignment like
 *	    C++=/usr/bin/CC
 *	is interpreted as "C+ +=" instead of "C++ =".
 *
 * Input:
 *	line		a line guaranteed to be a variable assignment.
 *			This reduces error checks
 *	ctxt		Context in which to do the assignment
 *
 * Results:
 *	none
 *
 * Side Effects:
 *	the variable structure of the given variable name is altered in the
 *	global context.
 *---------------------------------------------------------------------
 */
void
Parse_DoVar(char *line, GNode *ctxt)
{
    char	   *cp;	/* pointer into line */
    enum {
	VAR_SUBST, VAR_APPEND, VAR_SHELL, VAR_NORMAL
    }	    	    type;   	/* Type of assignment */
    char            *opc;	/* ptr to operator character to
				 * null-terminate the variable name */
    Boolean	   freeCp = FALSE; /* TRUE if cp needs to be freed,
				    * i.e. if any variable expansion was
				    * performed */
    int depth;

    /*
     * Skip to variable name
     */
    while ((*line == ' ') || (*line == '\t')) {
	line++;
    }

    /*
     * Skip to operator character, nulling out whitespace as we go
     * XXX Rather than counting () and {} we should look for $ and
     * then expand the variable.
     */
    for (depth = 0, cp = line + 1; depth != 0 || *cp != '='; cp++) {
	if (*cp == '(' || *cp == '{') {
	    depth++;
	    continue;
	}
	if (*cp == ')' || *cp == '}') {
	    depth--;
	    continue;
	}
	if (depth == 0 && isspace ((unsigned char)*cp)) {
	    *cp = '\0';
	}
    }
    opc = cp-1;		/* operator is the previous character */
    *cp++ = '\0';	/* nuke the = */

    /*
     * Check operator type
     */
    switch (*opc) {
	case '+':
	    type = VAR_APPEND;
	    *opc = '\0';
	    break;

	case '?':
	    /*
	     * If the variable already has a value, we don't do anything.
	     */
	    *opc = '\0';
	    if (Var_Exists(line, ctxt)) {
		return;
	    } else {
		type = VAR_NORMAL;
	    }
	    break;

	case ':':
	    type = VAR_SUBST;
	    *opc = '\0';
	    break;

	case '!':
	    type = VAR_SHELL;
	    *opc = '\0';
	    break;

	default:
#ifdef SUNSHCMD
	    while (opc > line && *opc != ':')
		opc--;

	    if (strncmp(opc, ":sh", 3) == 0) {
		type = VAR_SHELL;
		*opc = '\0';
		break;
	    }
#endif
	    type = VAR_NORMAL;
	    break;
    }

    while (isspace ((unsigned char)*cp)) {
	cp++;
    }

    if (type == VAR_APPEND) {
	Var_Append(line, cp, ctxt);
    } else if (type == VAR_SUBST) {
	/*
	 * Allow variables in the old value to be undefined, but leave their
	 * invocation alone -- this is done by forcing oldVars to be false.
	 * XXX: This can cause recursive variables, but that's not hard to do,
	 * and this allows someone to do something like
	 *
	 *  CFLAGS = $(.INCLUDES)
	 *  CFLAGS := -I.. $(CFLAGS)
	 *
	 * And not get an error.
	 */
	Boolean	  oldOldVars = oldVars;

	oldVars = FALSE;

	/*
	 * make sure that we set the variable the first time to nothing
	 * so that it gets substituted!
	 */
	if (!Var_Exists(line, ctxt))
	    Var_Set(line, "", ctxt, 0);

	cp = Var_Subst(NULL, cp, ctxt, FALSE);
	oldVars = oldOldVars;
	freeCp = TRUE;

	Var_Set(line, cp, ctxt, 0);
    } else if (type == VAR_SHELL) {
	char *res;
	const char *error;

	if (strchr(cp, '$') != NULL) {
	    /*
	     * There's a dollar sign in the command, so perform variable
	     * expansion on the whole thing. The resulting string will need
	     * freeing when we're done, so set freeCmd to TRUE.
	     */
	    cp = Var_Subst(NULL, cp, VAR_CMD, TRUE);
	    freeCp = TRUE;
	}

	res = Cmd_Exec(cp, &error);
	Var_Set(line, res, ctxt, 0);
	free(res);

	if (error)
	    Parse_Error(PARSE_WARNING, error, cp);
    } else {
	/*
	 * Normal assignment -- just do it.
	 */
	Var_Set(line, cp, ctxt, 0);
    }
    if (strcmp(line, MAKEOVERRIDES) == 0)
	Main_ExportMAKEFLAGS(FALSE);	/* re-export MAKEFLAGS */
    else if (strcmp(line, ".CURDIR") == 0) {
	/*
	 * Somone is being (too?) clever...
	 * Let's pretend they know what they are doing and
	 * re-initialize the 'cur' Path.
	 */
	Dir_InitCur(cp);
	Dir_SetPATH();
    } else if (strcmp(line, MAKE_JOB_PREFIX) == 0) {
	Job_SetPrefix();
    } else if (strcmp(line, MAKE_EXPORTED) == 0) {
	Var_Export(cp, 0);
    }
    if (freeCp)
	free(cp);
}


/*-
 * ParseAddCmd  --
 *	Lst_ForEach function to add a command line to all targets
 *
 * Input:
 *	gnp		the node to which the command is to be added
 *	cmd		the command to add
 *
 * Results:
 *	Always 0
 *
 * Side Effects:
 *	A new element is added to the commands list of the node.
 */
static int
ParseAddCmd(void *gnp, void *cmd)
{
    GNode *gn = (GNode *)gnp;

    /* Add to last (ie current) cohort for :: targets */
    if ((gn->type & OP_DOUBLEDEP) && !Lst_IsEmpty (gn->cohorts))
	gn = (GNode *)Lst_Datum(Lst_Last(gn->cohorts));

    /* if target already supplied, ignore commands */
    if (!(gn->type & OP_HAS_COMMANDS)) {
	(void)Lst_AtEnd(gn->commands, cmd);
	ParseMark(gn);
    } else {
#ifdef notyet
	/* XXX: We cannot do this until we fix the tree */
	(void)Lst_AtEnd(gn->commands, cmd);
	Parse_Error(PARSE_WARNING,
		     "overriding commands for target \"%s\"; "
		     "previous commands defined at %s: %d ignored",
		     gn->name, gn->fname, gn->lineno);
#else
	Parse_Error(PARSE_WARNING,
		     "duplicate script for target \"%s\" ignored",
		     gn->name);
	ParseErrorInternal(gn->fname, gn->lineno, PARSE_WARNING,
			    "using previous script for \"%s\" defined here",
			    gn->name);
#endif
    }
    return(0);
}

/*-
 *-----------------------------------------------------------------------
 * ParseHasCommands --
 *	Callback procedure for Parse_File when destroying the list of
 *	targets on the last dependency line. Marks a target as already
 *	having commands if it does, to keep from having shell commands
 *	on multiple dependency lines.
 *
 * Input:
 *	gnp		Node to examine
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	OP_HAS_COMMANDS may be set for the target.
 *
 *-----------------------------------------------------------------------
 */
static void
ParseHasCommands(void *gnp)
{
    GNode *gn = (GNode *)gnp;
    if (!Lst_IsEmpty(gn->commands)) {
	gn->type |= OP_HAS_COMMANDS;
    }
}

/*-
 *-----------------------------------------------------------------------
 * Parse_AddIncludeDir --
 *	Add a directory to the path searched for included makefiles
 *	bracketed by double-quotes. Used by functions in main.c
 *
 * Input:
 *	dir		The name of the directory to add
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	The directory is appended to the list.
 *
 *-----------------------------------------------------------------------
 */
void
Parse_AddIncludeDir(char *dir)
{
    (void)Dir_AddDir(parseIncPath, dir);
}

/*-
 *---------------------------------------------------------------------
 * ParseDoInclude  --
 *	Push to another file.
 *
 *	The input is the line minus the `.'. A file spec is a string
 *	enclosed in <> or "". The former is looked for only in sysIncPath.
 *	The latter in . and the directories specified by -I command line
 *	options
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	A structure is added to the includes Lst and readProc, lineno,
 *	fname and curFILE are altered for the new file
 *---------------------------------------------------------------------
 */

static void
Parse_include_file(char *file, Boolean isSystem, int silent)
{
    struct loadedfile *lf;
    char          *fullname;	/* full pathname of file */
    char          *newName;
    char          *prefEnd, *incdir;
    int           fd;
    int           i;

    /*
     * Now we know the file's name and its search path, we attempt to
     * find the durn thing. A return of NULL indicates the file don't
     * exist.
     */
    fullname = file[0] == '/' ? bmake_strdup(file) : NULL;

    if (fullname == NULL && !isSystem) {
	/*
	 * Include files contained in double-quotes are first searched for
	 * relative to the including file's location. We don't want to
	 * cd there, of course, so we just tack on the old file's
	 * leading path components and call Dir_FindFile to see if
	 * we can locate the beast.
	 */

	incdir = bmake_strdup(curFile->fname);
	prefEnd = strrchr(incdir, '/');
	if (prefEnd != NULL) {
	    *prefEnd = '\0';
	    /* Now do lexical processing of leading "../" on the filename */
	    for (i = 0; strncmp(file + i, "../", 3) == 0; i += 3) {
		prefEnd = strrchr(incdir + 1, '/');
		if (prefEnd == NULL || strcmp(prefEnd, "/..") == 0)
		    break;
		*prefEnd = '\0';
	    }
	    newName = str_concat(incdir, file + i, STR_ADDSLASH);
	    fullname = Dir_FindFile(newName, parseIncPath);
	    if (fullname == NULL)
		fullname = Dir_FindFile(newName, dirSearchPath);
	    free(newName);
	}
	free(incdir);

	if (fullname == NULL) {
	    /*
    	     * Makefile wasn't found in same directory as included makefile.
	     * Search for it first on the -I search path,
	     * then on the .PATH search path, if not found in a -I directory.
	     * If we have a suffix specific path we should use that.
	     */
	    char *suff;
	    Lst	suffPath = NULL;

	    if ((suff = strrchr(file, '.'))) {
		suffPath = Suff_GetPath(suff);
		if (suffPath != NULL) {
		    fullname = Dir_FindFile(file, suffPath);
		}
	    }
	    if (fullname == NULL) {
		fullname = Dir_FindFile(file, parseIncPath);
		if (fullname == NULL) {
		    fullname = Dir_FindFile(file, dirSearchPath);
		}
	    }
	}
    }

    /* Looking for a system file or file still not found */
    if (fullname == NULL) {
	/*
	 * Look for it on the system path
	 */
	fullname = Dir_FindFile(file,
		    Lst_IsEmpty(sysIncPath) ? defIncPath : sysIncPath);
    }

    if (fullname == NULL) {
	if (!silent)
	    Parse_Error(PARSE_FATAL, "Could not find %s", file);
	return;
    }

    /* Actually open the file... */
    fd = open(fullname, O_RDONLY);
    if (fd == -1) {
	if (!silent)
	    Parse_Error(PARSE_FATAL, "Cannot open %s", fullname);
	free(fullname);
	return;
    }

    /* load it */
    lf = loadfile(fullname, fd);

    /* Start reading from this file next */
    Parse_SetInput(fullname, 0, -1, loadedfile_nextbuf, lf);
    curFile->lf = lf;
}

static void
ParseDoInclude(char *line)
{
    char          endc;	    	/* the character which ends the file spec */
    char          *cp;		/* current position in file spec */
    int		  silent = (*line != 'i') ? 1 : 0;
    char	  *file = &line[7 + silent];

    /* Skip to delimiter character so we know where to look */
    while (*file == ' ' || *file == '\t')
	file++;

    if (*file != '"' && *file != '<') {
	Parse_Error(PARSE_FATAL,
	    ".include filename must be delimited by '\"' or '<'");
	return;
    }

    /*
     * Set the search path on which to find the include file based on the
     * characters which bracket its name. Angle-brackets imply it's
     * a system Makefile while double-quotes imply it's a user makefile
     */
    if (*file == '<') {
	endc = '>';
    } else {
	endc = '"';
    }

    /* Skip to matching delimiter */
    for (cp = ++file; *cp && *cp != endc; cp++)
	continue;

    if (*cp != endc) {
	Parse_Error(PARSE_FATAL,
		     "Unclosed %cinclude filename. '%c' expected",
		     '.', endc);
	return;
    }
    *cp = '\0';

    /*
     * Substitute for any variables in the file name before trying to
     * find the thing.
     */
    file = Var_Subst(NULL, file, VAR_CMD, FALSE);

    Parse_include_file(file, endc == '>', silent);
    free(file);
}


/*-
 *---------------------------------------------------------------------
 * ParseSetParseFile  --
 *	Set the .PARSEDIR and .PARSEFILE variables to the dirname and
 *	basename of the given filename
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	The .PARSEDIR and .PARSEFILE variables are overwritten by the
 *	dirname and basename of the given filename.
 *---------------------------------------------------------------------
 */
static void
ParseSetParseFile(const char *filename)
{
    char *slash, *dirname;
    const char *pd, *pf;
    int len;

    slash = strrchr(filename, '/');
    if (slash == NULL) {
	Var_Set(".PARSEDIR", pd = curdir, VAR_GLOBAL, 0);
	Var_Set(".PARSEFILE", pf = filename, VAR_GLOBAL, 0);
	dirname= NULL;
    } else {
	len = slash - filename;
	dirname = bmake_malloc(len + 1);
	memcpy(dirname, filename, len);
	dirname[len] = '\0';
	Var_Set(".PARSEDIR", pd = dirname, VAR_GLOBAL, 0);
	Var_Set(".PARSEFILE", pf = slash + 1, VAR_GLOBAL, 0);
    }
    if (DEBUG(PARSE))
	fprintf(debug_file, "ParseSetParseFile: ${.PARSEDIR} = `%s' "
	    "${.PARSEFILE} = `%s'\n", pd, pf);
    free(dirname);
}

/*
 * Track the makefiles we read - so makefiles can
 * set dependencies on them.
 * Avoid adding anything more than once.
 */

static void
ParseTrackInput(const char *name)
{
    char *old;
    char *fp = NULL;
    size_t name_len = strlen(name);
    
    old = Var_Value(MAKE_MAKEFILES, VAR_GLOBAL, &fp);
    if (old) {
	/* does it contain name? */
	for (; old != NULL; old = strchr(old, ' ')) {
	    if (*old == ' ')
		old++;
	    if (memcmp(old, name, name_len) == 0
		    && (old[name_len] == 0 || old[name_len] == ' '))
		goto cleanup;
	}
    }
    Var_Append (MAKE_MAKEFILES, name, VAR_GLOBAL);
 cleanup:
    if (fp) {
	free(fp);
    }
}


/*-
 *---------------------------------------------------------------------
 * Parse_setInput  --
 *	Start Parsing from the given source
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	A structure is added to the includes Lst and readProc, lineno,
 *	fname and curFile are altered for the new file
 *---------------------------------------------------------------------
 */
void
Parse_SetInput(const char *name, int line, int fd,
	char *(*nextbuf)(void *, size_t *), void *arg)
{
    char *buf;
    size_t len;

    if (name == NULL)
	name = curFile->fname;
    else
	ParseTrackInput(name);

    if (DEBUG(PARSE))
	fprintf(debug_file, "Parse_SetInput: file %s, line %d, fd %d, nextbuf %p, arg %p\n",
		name, line, fd, nextbuf, arg);

    if (fd == -1 && nextbuf == NULL)
	/* sanity */
	return;

    if (curFile != NULL)
	/* Save exiting file info */
	Lst_AtFront(includes, curFile);

    /* Allocate and fill in new structure */
    curFile = bmake_malloc(sizeof *curFile);

    /*
     * Once the previous state has been saved, we can get down to reading
     * the new file. We set up the name of the file to be the absolute
     * name of the include file so error messages refer to the right
     * place.
     */
    curFile->fname = bmake_strdup(name);
    curFile->lineno = line;
    curFile->first_lineno = line;
    curFile->nextbuf = nextbuf;
    curFile->nextbuf_arg = arg;
    curFile->lf = NULL;

    assert(nextbuf != NULL);

    /* Get first block of input data */
    buf = curFile->nextbuf(curFile->nextbuf_arg, &len);
    if (buf == NULL) {
        /* Was all a waste of time ... */
	if (curFile->fname)
	    free(curFile->fname);
	free(curFile);
	return;
    }
    curFile->P_str = buf;
    curFile->P_ptr = buf;
    curFile->P_end = buf+len;

    curFile->cond_depth = Cond_save_depth();
    ParseSetParseFile(name);
}

#ifdef SYSVINCLUDE
/*-
 *---------------------------------------------------------------------
 * ParseTraditionalInclude  --
 *	Push to another file.
 *
 *	The input is the current line. The file name(s) are
 *	following the "include".
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	A structure is added to the includes Lst and readProc, lineno,
 *	fname and curFILE are altered for the new file
 *---------------------------------------------------------------------
 */
static void
ParseTraditionalInclude(char *line)
{
    char          *cp;		/* current position in file spec */
    int		   done = 0;
    int		   silent = (line[0] != 'i') ? 1 : 0;
    char	  *file = &line[silent + 7];
    char	  *all_files;

    if (DEBUG(PARSE)) {
	    fprintf(debug_file, "ParseTraditionalInclude: %s\n", file);
    }

    /*
     * Skip over whitespace
     */
    while (isspace((unsigned char)*file))
	file++;

    /*
     * Substitute for any variables in the file name before trying to
     * find the thing.
     */
    all_files = Var_Subst(NULL, file, VAR_CMD, FALSE);

    if (*file == '\0') {
	Parse_Error(PARSE_FATAL,
		     "Filename missing from \"include\"");
	return;
    }

    for (file = all_files; !done; file = cp + 1) {
	/* Skip to end of line or next whitespace */
	for (cp = file; *cp && !isspace((unsigned char) *cp); cp++)
	    continue;

	if (*cp)
	    *cp = '\0';
	else
	    done = 1;

	Parse_include_file(file, FALSE, silent);
    }
    free(all_files);
}
#endif

#ifdef GMAKEEXPORT
/*-
 *---------------------------------------------------------------------
 * ParseGmakeExport  --
 *	Parse export <variable>=<value>
 *
 *	And set the environment with it.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	None
 *---------------------------------------------------------------------
 */
static void
ParseGmakeExport(char *line)
{
    char	  *variable = &line[6];
    char	  *value;

    if (DEBUG(PARSE)) {
	    fprintf(debug_file, "ParseGmakeExport: %s\n", variable);
    }

    /*
     * Skip over whitespace
     */
    while (isspace((unsigned char)*variable))
	variable++;

    for (value = variable; *value && *value != '='; value++)
	continue;

    if (*value != '=') {
	Parse_Error(PARSE_FATAL,
		     "Variable/Value missing from \"export\"");
	return;
    }
    *value++ = '\0';			/* terminate variable */

    /*
     * Expand the value before putting it in the environment.
     */
    value = Var_Subst(NULL, value, VAR_CMD, FALSE);
    setenv(variable, value, 1);
}
#endif

/*-
 *---------------------------------------------------------------------
 * ParseEOF  --
 *	Called when EOF is reached in the current file. If we were reading
 *	an include file, the includes stack is popped and things set up
 *	to go back to reading the previous file at the previous location.
 *
 * Results:
 *	CONTINUE if there's more to do. DONE if not.
 *
 * Side Effects:
 *	The old curFILE, is closed. The includes list is shortened.
 *	lineno, curFILE, and fname are changed if CONTINUE is returned.
 *---------------------------------------------------------------------
 */
static int
ParseEOF(void)
{
    char *ptr;
    size_t len;

    assert(curFile->nextbuf != NULL);

    /* get next input buffer, if any */
    ptr = curFile->nextbuf(curFile->nextbuf_arg, &len);
    curFile->P_ptr = ptr;
    curFile->P_str = ptr;
    curFile->P_end = ptr + len;
    curFile->lineno = curFile->first_lineno;
    if (ptr != NULL) {
	/* Iterate again */
	return CONTINUE;
    }

    /* Ensure the makefile (or loop) didn't have mismatched conditionals */
    Cond_restore_depth(curFile->cond_depth);

    if (curFile->lf != NULL) {
	    loadedfile_destroy(curFile->lf);
	    curFile->lf = NULL;
    }

    /* Dispose of curFile info */
    /* Leak curFile->fname because all the gnodes have pointers to it */
    free(curFile->P_str);
    free(curFile);

    curFile = Lst_DeQueue(includes);

    if (curFile == NULL) {
	/* We've run out of input */
	Var_Delete(".PARSEDIR", VAR_GLOBAL);
	Var_Delete(".PARSEFILE", VAR_GLOBAL);
	return DONE;
    }

    if (DEBUG(PARSE))
	fprintf(debug_file, "ParseEOF: returning to file %s, line %d\n",
	    curFile->fname, curFile->lineno);

    /* Restore the PARSEDIR/PARSEFILE variables */
    ParseSetParseFile(curFile->fname);
    return (CONTINUE);
}

#define PARSE_RAW 1
#define PARSE_SKIP 2

static char *
ParseGetLine(int flags, int *length)
{
    IFile *cf = curFile;
    char *ptr;
    char ch;
    char *line;
    char *line_end;
    char *escaped;
    char *comment;
    char *tp;

    /* Loop through blank lines and comment lines */
    for (;;) {
	cf->lineno++;
	line = cf->P_ptr;
	ptr = line;
	line_end = line;
	escaped = NULL;
	comment = NULL;
	for (;;) {
	    if (cf->P_end != NULL && ptr == cf->P_end) {
		/* end of buffer */
		ch = 0;
		break;
	    }
	    ch = *ptr;
	    if (ch == 0 || (ch == '\\' && ptr[1] == 0)) {
		if (cf->P_end == NULL)
		    /* End of string (aka for loop) data */
		    break;
		/* see if there is more we can parse */
		while (ptr++ < cf->P_end) {
		    if ((ch = *ptr) == '\n') {
			if (ptr > line && ptr[-1] == '\\')
			    continue;
			Parse_Error(PARSE_WARNING,
			    "Zero byte read from file, skipping rest of line.");
			break;
		    }
		}
		if (cf->nextbuf != NULL) {
		    /*
		     * End of this buffer; return EOF and outer logic
		     * will get the next one. (eww)
		     */
		    break;
		}
		Parse_Error(PARSE_FATAL, "Zero byte read from file");
		return NULL;
	    }

	    if (ch == '\\') {
		/* Don't treat next character as special, remember first one */
		if (escaped == NULL)
		    escaped = ptr;
		if (ptr[1] == '\n')
		    cf->lineno++;
		ptr += 2;
		line_end = ptr;
		continue;
	    }
	    if (ch == '#' && comment == NULL) {
		/* Remember first '#' for comment stripping */
		/* Unless previous char was '[', as in modifier :[#] */
		if (!(ptr > line && ptr[-1] == '['))
		    comment = line_end;
	    }
	    ptr++;
	    if (ch == '\n')
		break;
	    if (!isspace((unsigned char)ch))
		/* We are not interested in trailing whitespace */
		line_end = ptr;
	}

	/* Save next 'to be processed' location */
	cf->P_ptr = ptr;

	/* Check we have a non-comment, non-blank line */
	if (line_end == line || comment == line) {
	    if (ch == 0)
		/* At end of file */
		return NULL;
	    /* Parse another line */
	    continue;
	}

	/* We now have a line of data */
	*line_end = 0;

	if (flags & PARSE_RAW) {
	    /* Leave '\' (etc) in line buffer (eg 'for' lines) */
	    *length = line_end - line;
	    return line;
	}

	if (flags & PARSE_SKIP) {
	    /* Completely ignore non-directives */
	    if (line[0] != '.')
		continue;
	    /* We could do more of the .else/.elif/.endif checks here */
	}
	break;
    }

    /* Brutally ignore anything after a non-escaped '#' in non-commands */
    if (comment != NULL && line[0] != '\t') {
	line_end = comment;
	*line_end = 0;
    }

    /* If we didn't see a '\\' then the in-situ data is fine */
    if (escaped == NULL) {
	*length = line_end - line;
	return line;
    }

    /* Remove escapes from '\n' and '#' */
    tp = ptr = escaped;
    escaped = line;
    for (; ; *tp++ = ch) {
	ch = *ptr++;
	if (ch != '\\') {
	    if (ch == 0)
		break;
	    continue;
	}

	ch = *ptr++;
	if (ch == 0) {
	    /* Delete '\\' at end of buffer */
	    tp--;
	    break;
	}

	if (ch == '#' && line[0] != '\t')
	    /* Delete '\\' from before '#' on non-command lines */
	    continue;

	if (ch != '\n') {
	    /* Leave '\\' in buffer for later */
	    *tp++ = '\\';
	    /* Make sure we don't delete an escaped ' ' from the line end */
	    escaped = tp + 1;
	    continue;
	}

	/* Escaped '\n' replace following whitespace with a single ' ' */
	while (ptr[0] == ' ' || ptr[0] == '\t')
	    ptr++;
	ch = ' ';
    }

    /* Delete any trailing spaces - eg from empty continuations */
    while (tp > escaped && isspace((unsigned char)tp[-1]))
	tp--;

    *tp = 0;
    *length = tp - line;
    return line;
}

/*-
 *---------------------------------------------------------------------
 * ParseReadLine --
 *	Read an entire line from the input file. Called only by Parse_File.
 *
 * Results:
 *	A line w/o its newline
 *
 * Side Effects:
 *	Only those associated with reading a character
 *---------------------------------------------------------------------
 */
static char *
ParseReadLine(void)
{
    char 	  *line;    	/* Result */
    int	    	  lineLength;	/* Length of result */
    int	    	  lineno;	/* Saved line # */
    int	    	  rval;

    for (;;) {
	line = ParseGetLine(0, &lineLength);
	if (line == NULL)
	    return NULL;

	if (line[0] != '.')
	    return line;

	/*
	 * The line might be a conditional. Ask the conditional module
	 * about it and act accordingly
	 */
	switch (Cond_Eval(line)) {
	case COND_SKIP:
	    /* Skip to next conditional that evaluates to COND_PARSE.  */
	    do {
		line = ParseGetLine(PARSE_SKIP, &lineLength);
	    } while (line && Cond_Eval(line) != COND_PARSE);
	    if (line == NULL)
		break;
	    continue;
	case COND_PARSE:
	    continue;
	case COND_INVALID:    /* Not a conditional line */
	    /* Check for .for loops */
	    rval = For_Eval(line);
	    if (rval == 0)
		/* Not a .for line */
		break;
	    if (rval < 0)
		/* Syntax error - error printed, ignore line */
		continue;
	    /* Start of a .for loop */
	    lineno = curFile->lineno;
	    /* Accumulate loop lines until matching .endfor */
	    do {
		line = ParseGetLine(PARSE_RAW, &lineLength);
		if (line == NULL) {
		    Parse_Error(PARSE_FATAL,
			     "Unexpected end of file in for loop.");
		    break;
		}
	    } while (For_Accum(line));
	    /* Stash each iteration as a new 'input file' */
	    For_Run(lineno);
	    /* Read next line from for-loop buffer */
	    continue;
	}
	return (line);
    }
}

/*-
 *-----------------------------------------------------------------------
 * ParseFinishLine --
 *	Handle the end of a dependency group.
 *
 * Results:
 *	Nothing.
 *
 * Side Effects:
 *	inLine set FALSE. 'targets' list destroyed.
 *
 *-----------------------------------------------------------------------
 */
static void
ParseFinishLine(void)
{
    if (inLine) {
	Lst_ForEach(targets, Suff_EndTransform, NULL);
	Lst_Destroy(targets, ParseHasCommands);
	targets = NULL;
	inLine = FALSE;
    }
}


/*-
 *---------------------------------------------------------------------
 * Parse_File --
 *	Parse a file into its component parts, incorporating it into the
 *	current dependency graph. This is the main function and controls
 *	almost every other function in this module
 *
 * Input:
 *	name		the name of the file being read
 *	fd		Open file to makefile to parse
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	closes fd.
 *	Loads. Nodes are added to the list of all targets, nodes and links
 *	are added to the dependency graph. etc. etc. etc.
 *---------------------------------------------------------------------
 */
void
Parse_File(const char *name, int fd)
{
    char	  *cp;		/* pointer into the line */
    char          *line;	/* the line we're working on */
    struct loadedfile *lf;

    lf = loadfile(name, fd);

    inLine = FALSE;
    fatals = 0;

    if (name == NULL) {
	    name = "(stdin)";
    }

    Parse_SetInput(name, 0, -1, loadedfile_nextbuf, lf);
    curFile->lf = lf;

    do {
	for (; (line = ParseReadLine()) != NULL; ) {
	    if (DEBUG(PARSE))
		fprintf(debug_file, "ParseReadLine (%d): '%s'\n",
			curFile->lineno, line);
	    if (*line == '.') {
		/*
		 * Lines that begin with the special character may be
		 * include or undef directives.
		 * On the other hand they can be suffix rules (.c.o: ...)
		 * or just dependencies for filenames that start '.'.
		 */
		for (cp = line + 1; isspace((unsigned char)*cp); cp++) {
		    continue;
		}
		if (strncmp(cp, "include", 7) == 0 ||
			((cp[0] == 's' || cp[0] == '-') &&
			    strncmp(&cp[1], "include", 7) == 0)) {
		    ParseDoInclude(cp);
		    continue;
		}
		if (strncmp(cp, "undef", 5) == 0) {
		    char *cp2;
		    for (cp += 5; isspace((unsigned char) *cp); cp++)
			continue;
		    for (cp2 = cp; !isspace((unsigned char) *cp2) &&
				   (*cp2 != '\0'); cp2++)
			continue;
		    *cp2 = '\0';
		    Var_Delete(cp, VAR_GLOBAL);
		    continue;
		} else if (strncmp(cp, "export", 6) == 0) {
		    for (cp += 6; isspace((unsigned char) *cp); cp++)
			continue;
		    Var_Export(cp, 1);
		    continue;
		} else if (strncmp(cp, "unexport", 8) == 0) {
		    Var_UnExport(cp);
		    continue;
		} else if (strncmp(cp, "info", 4) == 0 ||
			   strncmp(cp, "error", 5) == 0 ||
			   strncmp(cp, "warning", 7) == 0) {
		    if (ParseMessage(cp))
			continue;
		}		    
	    }

	    if (*line == '\t') {
		/*
		 * If a line starts with a tab, it can only hope to be
		 * a creation command.
		 */
		cp = line + 1;
	      shellCommand:
		for (; isspace ((unsigned char)*cp); cp++) {
		    continue;
		}
		if (*cp) {
		    if (!inLine)
			Parse_Error(PARSE_FATAL,
				     "Unassociated shell command \"%s\"",
				     cp);
		    /*
		     * So long as it's not a blank line and we're actually
		     * in a dependency spec, add the command to the list of
		     * commands of all targets in the dependency spec
		     */
		    if (targets) {
			cp = bmake_strdup(cp);
			Lst_ForEach(targets, ParseAddCmd, cp);
#ifdef CLEANUP
			Lst_AtEnd(targCmds, cp);
#endif
		    }
		}
		continue;
	    }

#ifdef SYSVINCLUDE
	    if (((strncmp(line, "include", 7) == 0 &&
		    isspace((unsigned char) line[7])) ||
			((line[0] == 's' || line[0] == '-') &&
			    strncmp(&line[1], "include", 7) == 0 &&
			    isspace((unsigned char) line[8]))) &&
		    strchr(line, ':') == NULL) {
		/*
		 * It's an S3/S5-style "include".
		 */
		ParseTraditionalInclude(line);
		continue;
	    }
#endif
#ifdef GMAKEEXPORT
	    if (strncmp(line, "export", 6) == 0 &&
		isspace((unsigned char) line[6]) &&
		strchr(line, ':') == NULL) {
		/*
		 * It's a Gmake "export".
		 */
		ParseGmakeExport(line);
		continue;
	    }
#endif
	    if (Parse_IsVar(line)) {
		ParseFinishLine();
		Parse_DoVar(line, VAR_GLOBAL);
		continue;
	    }

#ifndef POSIX
	    /*
	     * To make life easier on novices, if the line is indented we
	     * first make sure the line has a dependency operator in it.
	     * If it doesn't have an operator and we're in a dependency
	     * line's script, we assume it's actually a shell command
	     * and add it to the current list of targets.
	     */
	    cp = line;
	    if (isspace((unsigned char) line[0])) {
		while ((*cp != '\0') && isspace((unsigned char) *cp))
		    cp++;
		while (*cp && (ParseIsEscaped(line, cp) ||
			(*cp != ':') && (*cp != '!'))) {
		    cp++;
		}
		if (*cp == '\0') {
		    if (inLine) {
			Parse_Error(PARSE_WARNING,
				     "Shell command needs a leading tab");
			goto shellCommand;
		    }
		}
	    }
#endif
	    ParseFinishLine();

	    /*
	     * For some reason - probably to make the parser impossible -
	     * a ';' can be used to separate commands from dependencies.
	     * Attempt to avoid ';' inside substitution patterns.
	     */
	    {
		int level = 0;

		for (cp = line; *cp != 0; cp++) {
		    if (*cp == '\\' && cp[1] != 0) {
			cp++;
			continue;
		    }
		    if (*cp == '$' &&
			(cp[1] == '(' || cp[1] == '{')) {
			level++;
			continue;
		    }
		    if (level > 0) {
			if (*cp == ')' || *cp == '}') {
			    level--;
			    continue;
			}
		    } else if (*cp == ';') {
			break;
		    }
		}
	    }
	    if (*cp != 0)
		/* Terminate the dependency list at the ';' */
		*cp++ = 0;
	    else
		cp = NULL;

	    /*
	     * We now know it's a dependency line so it needs to have all
	     * variables expanded before being parsed. Tell the variable
	     * module to complain if some variable is undefined...
	     */
	    line = Var_Subst(NULL, line, VAR_CMD, TRUE);

	    /*
	     * Need a non-circular list for the target nodes
	     */
	    if (targets)
		Lst_Destroy(targets, NULL);

	    targets = Lst_Init(FALSE);
	    inLine = TRUE;

	    ParseDoDependency(line);
	    free(line);

	    /* If there were commands after a ';', add them now */
	    if (cp != NULL) {
		goto shellCommand;
	    }
	}
	/*
	 * Reached EOF, but it may be just EOF of an include file...
	 */
    } while (ParseEOF() == CONTINUE);

    if (fatals) {
	(void)fflush(stdout);
	(void)fprintf(stderr,
	    "%s: Fatal errors encountered -- cannot continue",
	    progname);
	PrintOnError(NULL, NULL);
	exit(1);
    }
}

/*-
 *---------------------------------------------------------------------
 * Parse_Init --
 *	initialize the parsing module
 *
 * Results:
 *	none
 *
 * Side Effects:
 *	the parseIncPath list is initialized...
 *---------------------------------------------------------------------
 */
void
Parse_Init(void)
{
    mainNode = NULL;
    parseIncPath = Lst_Init(FALSE);
    sysIncPath = Lst_Init(FALSE);
    defIncPath = Lst_Init(FALSE);
    includes = Lst_Init(FALSE);
#ifdef CLEANUP
    targCmds = Lst_Init(FALSE);
#endif
}

void
Parse_End(void)
{
#ifdef CLEANUP
    Lst_Destroy(targCmds, (FreeProc *)free);
    if (targets)
	Lst_Destroy(targets, NULL);
    Lst_Destroy(defIncPath, Dir_Destroy);
    Lst_Destroy(sysIncPath, Dir_Destroy);
    Lst_Destroy(parseIncPath, Dir_Destroy);
    Lst_Destroy(includes, NULL);	/* Should be empty now */
#endif
}


/*-
 *-----------------------------------------------------------------------
 * Parse_MainName --
 *	Return a Lst of the main target to create for main()'s sake. If
 *	no such target exists, we Punt with an obnoxious error message.
 *
 * Results:
 *	A Lst of the single node to create.
 *
 * Side Effects:
 *	None.
 *
 *-----------------------------------------------------------------------
 */
Lst
Parse_MainName(void)
{
    Lst           mainList;	/* result list */

    mainList = Lst_Init(FALSE);

    if (mainNode == NULL) {
	Punt("no target to make.");
    	/*NOTREACHED*/
    } else if (mainNode->type & OP_DOUBLEDEP) {
	(void)Lst_AtEnd(mainList, mainNode);
	Lst_Concat(mainList, mainNode->cohorts, LST_CONCNEW);
    }
    else
	(void)Lst_AtEnd(mainList, mainNode);
    Var_Append(".TARGETS", mainNode->name, VAR_GLOBAL);
    return (mainList);
}

/*-
 *-----------------------------------------------------------------------
 * ParseMark --
 *	Add the filename and lineno to the GNode so that we remember
 *	where it was first defined.
 *
 * Side Effects:
 *	None.
 *
 *-----------------------------------------------------------------------
 */
static void
ParseMark(GNode *gn)
{
    gn->fname = curFile->fname;
    gn->lineno = curFile->lineno;
}