minix/lib/other/getopt.c
2005-04-21 14:53:53 +00:00

66 lines
1.1 KiB
C
Executable file

/*
* getopt - parse command-line options
*/
/* $Header$ */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define ERR(s, c) if(opterr){\
fputs(argv[0], stderr);\
fputs(s, stderr);\
fputc(c, stderr);\
fputc('\n', stderr);}
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
int
getopt(argc, argv, opts)
int argc;
char **argv;
char *opts;
{
static int sp = 1;
register c;
register char *cp;
if (sp == 1)
if (optind >= argc ||
argv[optind][0] != '-' || argv[optind][1] == '\0')
return EOF;
else if (!strcmp(argv[optind], "--")) {
optind++;
return EOF;
}
optopt = c = argv[optind][sp];
if (c == ':' || (cp=strchr(opts, c)) == NULL) {
ERR (": illegal 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 (": option requires an argument -- ", c);
sp = 1;
return '?';
} else
optarg = argv[optind++];
sp = 1;
} else {
if (argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return c;
}