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52 lines
1 KiB
C
Executable file
52 lines
1 KiB
C
Executable file
#include <stdio.h>
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#define EPR fprintf(stderr,
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#define ERR(str, chr) if(opterr){EPR "%s%c\n", str, chr);}
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int opterr = 1;
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int optind = 1;
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int optopt;
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char *optarg;
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char *strchr();
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int
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getopt (int argc, char *const argv[], const char *opts)
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{
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static int sp = 1;
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int c;
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char *cp;
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if (sp == 1)
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if (optind >= argc ||
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argv[optind][0] != '-' || argv[optind][1] == '\0')
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return -1;
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else if (strcmp(argv[optind], "--") == 0) {
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optind++;
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return -1;
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}
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optopt = c = argv[optind][sp];
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if (c == ':' || (cp=strchr(opts, c)) == 0) {
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ERR (": illegal option -- ", c);
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if (argv[optind][++sp] == '\0') {
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optind++;
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sp = 1;
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}
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return '?';
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}
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if (*++cp == ':') {
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if (argv[optind][sp+1] != '\0')
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optarg = &argv[optind++][sp+1];
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else if (++optind >= argc) {
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ERR (": option requires an argument -- ", c);
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sp = 1;
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return '?';
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} else
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optarg = argv[optind++];
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sp = 1;
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} else {
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if (argv[optind][++sp] == '\0') {
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sp = 1;
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optind++;
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}
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optarg = 0;
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}
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return c;
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}
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