1 #include <stdio.h>
2 #include <string.h>
3 #include "ext.h"
4 #define ERR(str, chr) if(opterr){fprintf(stderr, "%s%s%c\n", argv[0], str, chr);}
5 int opterr = 1;
6 int optind = 1;
7 int optopt;
8 char *optarg;
9
10 int
getopt(int argc,char ** argv,char * opts)11 getopt (int argc, char **argv, char *opts)
12 {
13 static int sp = 1;
14 register int c;
15 register char *cp;
16
17 if (sp == 1)
18 if (optind >= argc ||
19 argv[optind][0] != '-' || argv[optind][1] == '\0')
20 return EOF;
21 else if (strcmp(argv[optind], "--") == 0) {
22 optind++;
23 return EOF;
24 }
25 optopt = c = argv[optind][sp];
26 if (c == ':' || (cp=strchr(opts, c)) == NULL) {
27 ERR (": illegal option -- ", c);
28 if (argv[optind][++sp] == '\0') {
29 optind++;
30 sp = 1;
31 }
32 return '?';
33 }
34 if (*++cp == ':') {
35 if (argv[optind][sp+1] != '\0')
36 optarg = &argv[optind++][sp+1];
37 else if (++optind >= argc) {
38 ERR (": option requires an argument -- ", c);
39 sp = 1;
40 return '?';
41 } else
42 optarg = argv[optind++];
43 sp = 1;
44 } else {
45 if (argv[optind][++sp] == '\0') {
46 sp = 1;
47 optind++;
48 }
49 optarg = NULL;
50 }
51 return c;
52 }
53