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getopt.c
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C/C++ Source or Header
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1992-02-13
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2KB
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82 lines
/* $Revision: 1.1 $
**
*/
#include <stdio.h>
#define ERR(s, c) \
if (opterr) { \
char buff[2]; \
buff[0] = c; buff[1] = '\n'; \
(void)write(2, av[0], strlen(av[0])); \
(void)write(2, s, strlen(s)); \
(void)write(2, buff, 2); \
}
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
/*
** Return options and their values from the command line.
** This comes from the AT&T public-domain getopt published in mod.sources
** (i.e., comp.sources.unix before the great Usenet renaming).
*/
int
getopt(ac, av, opts)
int ac;
char *av[];
char *opts;
{
extern char *strchr();
static int i = 1;
char *p;
/* Move to next value from argv? */
if (i == 1) {
if (optind >= ac || av[optind][0] != '-' || av[optind][1] == '\0')
return EOF;
if (strcmp(av[optind], "--") == 0) {
optind++;
return EOF;
}
}
/* Get next option character. */
if ((optopt = av[optind][i]) == ':'
|| (p = strchr(opts, optopt)) == NULL) {
ERR(": illegal option -- ", optopt);
if (av[optind][++i] == '\0') {
optind++;
i = 1;
}
return '?';
}
/* Snarf argument? */
if (*++p == ':') {
if (av[optind][i + 1] != '\0')
optarg = &av[optind++][i + 1];
else {
if (++optind >= ac) {
ERR(": option requires an argument -- ", optopt);
i = 1;
return '?';
}
optarg = av[optind++];
}
i = 1;
}
else {
if (av[optind][++i] == '\0') {
i = 1;
optind++;
}
optarg = NULL;
}
return optopt;
}