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-rw-r--r--getopt.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/getopt.c b/getopt.c
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index 000000000000..e6afaaaaa30d
--- /dev/null
+++ b/getopt.c
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+/*
+ * "getopt" routine customized for top.
+ */
+
+/*
+ * Many modern-day Unix implementations already have this function
+ * in libc. The standard "getopt" is perfectly sufficient for top's
+ * needs. If such a function exists in libc then you certainly don't
+ * need to compile this one in. To prevent this function from being
+ * compiled, define "HAVE_GETOPT". This is usually done in the "CFLAGS"
+ * line of the corresponding machine module.
+ */
+
+/*
+ * This empty declaration exists solely to placate overexhuberant C
+ * compilers that like to warn you about content-free files.
+ */
+static void __empty();
+
+#ifndef HAVE_GETOPT
+
+/*LINTLIBRARY*/
+
+#include "os.h"
+#ifndef NULL
+#define NULL 0
+#endif
+#ifndef EOF
+#define EOF (-1)
+#endif
+#define ERR(s, c) if(opterr){\
+ extern int write();\
+ char errbuf[2];\
+ errbuf[0] = c; errbuf[1] = '\n';\
+ (void) write(2, argv[0], strlen(argv[0]));\
+ (void) write(2, s, strlen(s));\
+ (void) write(2, errbuf, 2);}
+
+
+int opterr = 1;
+int optind = 1;
+int optopt;
+char *optarg;
+
+int
+getopt(argc, argv, opts)
+int argc;
+char **argv, *opts;
+{
+ static int sp = 1;
+ register int c;
+ register char *cp;
+
+ if(sp == 1)
+ if(optind >= argc ||
+ argv[optind][0] != '-' || argv[optind][1] == '\0')
+ return(EOF);
+ else if(strcmp(argv[optind], "--") == 0) {
+ optind++;
+ return(EOF);
+ }
+ optopt = c = argv[optind][sp];
+ if(c == ':' || (cp=strchr(opts, c)) == NULL) {
+ ERR(": unknown option, -", c);
+ if(argv[optind][++sp] == '\0') {
+ optind++;
+ sp = 1;
+ }
+ return('?');
+ }
+ if(*++cp == ':') {
+ if(argv[optind][sp+1] != '\0')
+ optarg = &argv[optind++][sp+1];
+ else if(++optind >= argc) {
+ ERR(": argument missing for -", c);
+ sp = 1;
+ return('?');
+ } else
+ optarg = argv[optind++];
+ sp = 1;
+ } else {
+ if(argv[optind][++sp] == '\0') {
+ sp = 1;
+ optind++;
+ }
+ optarg = NULL;
+ }
+ return(c);
+}
+#endif /* HAVE_GETOPT */