1 #include <stdio.h>
2 #include <string.h>
3 #define EPR fprintf(stderr,
4 #define ERR(str, chr) if(opterr){EPR "%s%c\n", str, chr);}
5 int opterr = 1;
6 int optind = 1;
7 int optopt;
8 char *optarg;
9
10 int
lcc_getopt(int argc,char * const argv[],const char * opts)11 lcc_getopt (int argc, char *const argv[], const char *opts)
12 {
13 static int sp = 1;
14 int c;
15 char *cp;
16
17 if (sp == 1) {
18 if (optind >= argc ||
19 argv[optind][0] != '-' || argv[optind][1] == '\0')
20 return -1;
21 else if (strcmp(argv[optind], "--") == 0) {
22 optind++;
23 return -1;
24 }
25 }
26 optopt = c = argv[optind][sp];
27 if (c == ':' || (cp=strchr(opts, c)) == 0) {
28 ERR (": illegal option -- ", c);
29 if (argv[optind][++sp] == '\0') {
30 optind++;
31 sp = 1;
32 }
33 return '?';
34 }
35 if (*++cp == ':') {
36 if (argv[optind][sp+1] != '\0')
37 optarg = &argv[optind++][sp+1];
38 else if (++optind >= argc) {
39 ERR (": option requires an argument -- ", c);
40 sp = 1;
41 return '?';
42 } else
43 optarg = argv[optind++];
44 sp = 1;
45 } else {
46 if (argv[optind][++sp] == '\0') {
47 sp = 1;
48 optind++;
49 }
50 optarg = 0;
51 }
52 return c;
53 }
54