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- /* getopt.c -- command line option/argument parser.
- * From AT&T UNIX System Toolchest
- */
-
- #define DOS_MODS
-
- #if defined (DOS_MODS)
- /* Program name set by main() */
- extern char *Pgm;
- #else
- #ident "@(#)getopt.c 1.9"
- #endif
-
- /* 3.0 SID # 1.2" */
- /* LINTLIBRARY */
- #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);}
-
- #if defined (DOS_MODS)
- /* permit funtion prototyping under DOS */
- #include <stdlib.h>
- #include <string.h>
- #else
- /* standard UNIX declarations */
- extern int strcmp();
- extern char *strchr();
- /*
- * The following line was moved here from the ERR definition to
- * prevent a "duplicate definition" error message when the code
- * is compiled under DOS.
- */
- extern int strlen(), write();
- #endif
-
- 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);
- }
-