78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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Newsgroups: mod.std.unix
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Subject: public domain AT&T getopt source
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Date: 3 Nov 85 19:34:15 GMT
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Here's something you've all been waiting for: the AT&T public domain
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source for getopt(3). It is the code which was given out at the 1985
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UNIFORUM conference in Dallas. I obtained it by electronic mail
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directly from AT&T. The people there assure me that it is indeed
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in the public domain.
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*/
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/*LINTLIBRARY*/
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#define NULL 0
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#define EOF (-1)
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#define ERR(s, c) if(opterr){\
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extern int strlen(), write();\
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char errbuf[2];\
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errbuf[0] = c; errbuf[1] = '\n';\
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(void) write(2, argv[0], (unsigned)strlen(argv[0]));\
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(void) write(2, s, (unsigned)strlen(s));\
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(void) write(2, errbuf, 2);}
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extern int strcmp();
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extern char *strchr();
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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
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getopt(argc, argv, opts)
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int argc;
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char **argv, *opts;
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{
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static int sp = 1;
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register int c;
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register 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(EOF);
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else if(strcmp(argv[optind], "--") == NULL) {
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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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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 = NULL;
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}
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return(c);
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}
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