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