aboutsummaryrefslogtreecommitdiffstats
path: root/common/util.c
blob: 1e87c62935502b0da32bd734dbc7418a8db196f3 (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
/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1991, 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>

#ifdef __APPLE__
#include <mach/clock.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "common.h"

/*
 * binc --
 *	Increase the size of a buffer.
 *
 * PUBLIC: void *binc(SCR *, void *, size_t *, size_t);
 */
void *
binc(SCR *sp,			/* sp MAY BE NULL!!! */
    void *bp, size_t *bsizep, size_t min)
{
	size_t csize;

	/* If already larger than the minimum, just return. */
	if (min && *bsizep >= min)
		return (bp);

	csize = p2roundup(MAX(min, 256));
	REALLOC(sp, bp, void *, csize);

	if (bp == NULL) {
		*bsizep = 0;
		return (NULL);
	}
	/*
	 * Memory is guaranteed to be zero-filled, various parts of
	 * nvi depend on this.
	 */
	memset((char *)bp + *bsizep, 0, csize - *bsizep);
	*bsizep = csize;
	return (bp);
}

/*
 * nonblank --
 *	Set the column number of the first non-blank character
 *	including or after the starting column.  On error, set
 *	the column to 0, it's safest.
 *
 * PUBLIC: int nonblank(SCR *, recno_t, size_t *);
 */
int
nonblank(SCR *sp, recno_t lno, size_t *cnop)
{
	CHAR_T *p;
	size_t cnt, len, off;
	int isempty;

	/* Default. */
	off = *cnop;
	*cnop = 0;

	/* Get the line, succeeding in an empty file. */
	if (db_eget(sp, lno, &p, &len, &isempty))
		return (!isempty);

	/* Set the offset. */
	if (len == 0 || off >= len)
		return (0);

	for (cnt = off, p = &p[off],
	    len -= off; len && ISBLANK(*p); ++cnt, ++p, --len);

	/* Set the return. */
	*cnop = len ? cnt : cnt - 1;
	return (0);
}

/*
 * join --
 *	Join two paths; need free.
 *
 * PUBLIC: char *join(char *, char *);
 */
char *
join(char *path1, char *path2)
{
	char *p;

	if (path1[0] == '\0' || path2[0] == '/')
		return strdup(path2);
	(void)asprintf(&p, path1[strlen(path1)-1] == '/' ?
	    "%s%s" : "%s/%s", path1, path2);
	return p;
}

/*
 * expanduser --
 *	Return a "~" or "~user" expanded path; need free.
 *
 * PUBLIC: char *expanduser(char *);
 */
char *
expanduser(char *str)
{
	struct passwd *pwd;
	char *p, *t, *u, *h;

	/*
	 * This function always expands the content between the
	 * leading '~' and the first '/' or '\0' from the input.
	 * Return NULL whenever we fail to do so.
	 */
	if (*str != '~')
		return (NULL);
	p = str + 1;
	for (t = p; *t != '/' && *t != '\0'; ++t)
		continue;
	if (t == p) {
		/* ~ */
		if (issetugid() != 0 ||
		    (h = getenv("HOME")) == NULL) {
			if (((h = getlogin()) != NULL &&
			     (pwd = getpwnam(h)) != NULL) ||
			    (pwd = getpwuid(getuid())) != NULL)
				h = pwd->pw_dir;
			else
				return (NULL);
		}
	} else {
		/* ~user */
		if ((u = strndup(p, t - p)) == NULL)
			return (NULL);
		if ((pwd = getpwnam(u)) == NULL) {
			free(u);
			return (NULL);
		} else
			h = pwd->pw_dir;
		free(u);
	}

	for (; *t == '/' && *t != '\0'; ++t)
		continue;
	return (join(h, t));
}

/*
 * quote --
 *	Return a escaped string for /bin/sh; need free.
 *
 * PUBLIC: char *quote(char *);
 */
char *
quote(char *str)
{
	char *p, *t;
	size_t i = 0, n = 0;
	int unsafe = 0;

	for (p = str; *p != '\0'; p++, i++) {
		if (*p == '\'')
			n++;
		if (unsafe)
			continue;
		if (isascii((u_char)*p)) {
			if (isalnum((u_char)*p))
				continue;
			switch (*p) {
			case '%': case '+': case ',': case '-': case '.':
			case '/': case ':': case '=': case '@': case '_':
				continue;
			}
		}
		unsafe = 1;
	}
	if (!unsafe)
		t = strdup(str);
#define SQT "'\\''"
	else if ((p = t = malloc(i + n * (sizeof(SQT) - 2) + 3)) != NULL) {
		*p++ = '\'';
		for (; *str != '\0'; str++) {
			if (*str == '\'') {
				(void)memcpy(p, SQT, sizeof(SQT) - 1);
				p += sizeof(SQT) - 1;
			} else
				*p++ = *str;
		}
		*p++ = '\'';
		*p = '\0';
	}
	return t;
}

/*
 * v_strdup --
 *	Strdup for 8-bit character strings with an associated length.
 *
 * PUBLIC: char *v_strdup(SCR *, const char *, size_t);
 */
char *
v_strdup(SCR *sp, const char *str, size_t len)
{
	char *copy;

	MALLOC(sp, copy, len + 1);
	if (copy == NULL)
		return (NULL);
	memcpy(copy, str, len);
	copy[len] = '\0';
	return (copy);
}

/*
 * v_wstrdup --
 *	Strdup for wide character strings with an associated length.
 *
 * PUBLIC: CHAR_T *v_wstrdup(SCR *, const CHAR_T *, size_t);
 */
CHAR_T *
v_wstrdup(SCR *sp, const CHAR_T *str, size_t len)
{
	CHAR_T *copy;

	MALLOC(sp, copy, (len + 1) * sizeof(CHAR_T));
	if (copy == NULL)
		return (NULL);
	MEMCPY(copy, str, len);
	copy[len] = '\0';
	return (copy);
}

/*
 * nget_uslong --
 *      Get an unsigned long, checking for overflow.
 *
 * PUBLIC: enum nresult nget_uslong(u_long *, const CHAR_T *, CHAR_T **, int);
 */
enum nresult
nget_uslong(u_long *valp, const CHAR_T *p, CHAR_T **endp, int base)
{
	errno = 0;
	*valp = STRTOUL(p, endp, base);
	if (errno == 0)
		return (NUM_OK);
	if (errno == ERANGE && *valp == ULONG_MAX)
		return (NUM_OVER);
	return (NUM_ERR);
}

/*
 * nget_slong --
 *      Convert a signed long, checking for overflow and underflow.
 *
 * PUBLIC: enum nresult nget_slong(long *, const CHAR_T *, CHAR_T **, int);
 */
enum nresult
nget_slong(long *valp, const CHAR_T *p, CHAR_T **endp, int base)
{
	errno = 0;
	*valp = STRTOL(p, endp, base);
	if (errno == 0)
		return (NUM_OK);
	if (errno == ERANGE) {
		if (*valp == LONG_MAX)
			return (NUM_OVER);
		if (*valp == LONG_MIN)
			return (NUM_UNDER);
	}
	return (NUM_ERR);
}

/*
 * timepoint_steady --
 *      Get a timestamp from a monotonic clock.
 *
 * PUBLIC: void timepoint_steady(struct timespec *);
 */
void
timepoint_steady(struct timespec *ts)
{
#ifdef __APPLE__
	static mach_timebase_info_data_t base = { 0 };
	uint64_t val;
	uint64_t ns;

	if (base.denom == 0)
		(void)mach_timebase_info(&base);

	val = mach_absolute_time();
	ns = val * base.numer / base.denom;
	ts->tv_sec = ns / 1000000000;
	ts->tv_nsec = ns % 1000000000;
#else
#ifdef CLOCK_MONOTONIC_FAST
	(void)clock_gettime(CLOCK_MONOTONIC_FAST, ts);
#else
	(void)clock_gettime(CLOCK_MONOTONIC, ts);
#endif
#endif
}

/*
 * timepoint_system --
 *      Get the current calendar time.
 *
 * PUBLIC: void timepoint_system(struct timespec *);
 */
void
timepoint_system(struct timespec *ts)
{
#ifdef __APPLE__
	clock_serv_t clk;
	mach_timespec_t mts;
	kern_return_t kr;

	kr = host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &clk);
	if (kr != KERN_SUCCESS)
		return;
	(void)clock_get_time(clk, &mts);
	(void)mach_port_deallocate(mach_task_self(), clk);
	ts->tv_sec = mts.tv_sec;
	ts->tv_nsec = mts.tv_nsec;
#else
#ifdef CLOCK_REALTIME_FAST
	(void)clock_gettime(CLOCK_REALTIME_FAST, ts);
#else
	(void)clock_gettime(CLOCK_REALTIME, ts);
#endif
#endif
}

#ifdef DEBUG
#include <stdarg.h>

/*
 * TRACE --
 *	debugging trace routine.
 *
 * PUBLIC: void TRACE(SCR *, const char *, ...);
 */
void
TRACE(SCR *sp, const char *fmt, ...)
{
	FILE *tfp;
	va_list ap;

	if ((tfp = sp->gp->tracefp) == NULL)
		return;
	va_start(ap, fmt);
	(void)vfprintf(tfp, fmt, ap);
	va_end(ap);

	(void)fflush(tfp);
}
#endif