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- /*
- Newsgroups: mod.std.unix
- Subject: public domain AT&T getopt source
- Date: 3 Nov 85 19:34:15 GMT
-
- Here's something you've all been waiting for: the AT&T public domain
- source for getopt(3). It is the code which was given out at the 1985
- UNIFORUM conference in Dallas. I obtained it by electronic mail
- directly from AT&T. The people there assure me that it is indeed
- in the public domain.
- */
-
-
- /*LINTLIBRARY*/
-
- #ifdef UNIX
- # if !defined(_NEXT_SOURCE)
- extern int strlen();
- # endif
- extern int strcmp();
- extern char *strchr();
- extern int write();
- #else
- #include <io.h>
- #include <string.h>
- #endif
-
- #define NULL 0
- #define EOF (-1)
- #define ERR(s, c) if(opterr){\
- char errbuf[2];\
- errbuf[0] = c; errbuf[1] = '\n';\
- (void) write(2, argv[0], (unsigned)strlen(argv[0]));\
- (void) write(2, s, (unsigned)strlen(s));\
- (void) write(2, errbuf, 2);}
-
-
- int opterr = 1;
- int optind = 1;
- int optopt;
- char *optarg;
-
- int
- getopt(argc, argv, opts)
- int argc;
- char **argv, *opts;
- {
- static int sp = 1;
- register int c;
- register char *cp;
-
- if(sp == 1)
- if(optind >= argc ||
- argv[optind][0] != '-' || argv[optind][1] == '\0')
- return(EOF);
- else if(strcmp(argv[optind], "--") == NULL) {
- optind++;
- return(EOF);
- }
- optopt = c = argv[optind][sp];
- if(c == ':' || (cp=strchr(opts, c)) == NULL) {
- ERR(": illegal option -- ", c);
- if(argv[optind][++sp] == '\0') {
- optind++;
- sp = 1;
- }
- return('?');
- }
- if(*++cp == ':') {
- if(argv[optind][sp+1] != '\0')
- optarg = &argv[optind++][sp+1];
- else if(++optind >= argc) {
- ERR(": option requires an argument -- ", c);
- sp = 1;
- return('?');
- } else
- optarg = argv[optind++];
- sp = 1;
- } else {
- if(argv[optind][++sp] == '\0') {
- sp = 1;
- optind++;
- }
- optarg = NULL;
- }
- return(c);
- }
-