/* * From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) Newsgroups: net.sources * Subject: getopt library routine Date: 30 Mar 85 04:45:33 GMT */ /* * getopt -- public domain version of standard System V routine * * Strictly enforces the System V Command Syntax Standard; provided by D A * Gwyn of BRL for generic ANSI C implementations * * #define STRICT to prevent acceptance of clustered options with arguments * and ommision of whitespace between option and arg. */ /* * Modified by Manuel Novoa III on 1/5/01 to use weak symbols. * Programs needing long options will link gnu_getopt instead. */ #include <stdio.h> #include <string.h> extern int opterr; /* error => print message */ extern int optind; /* next argv[] index */ extern int optopt; /* Set for unknown arguments */ extern char *optarg; /* option parameter if any */ static int Err(name, mess, c) /* returns '?' */ char *name; /* program name argv[0] */ char *mess; /* specific message */ int c; /* defective option letter */ { optopt = c; if (opterr) { (void) fprintf(stderr, "%s: %s -- %c\n", name, mess, c); } return '?'; /* erroneous-option marker */ } extern int getopt (int argc, char *const *argv, const char *optstring) __attribute__ ((__weak__)); int getopt (int argc, char *const *argv, const char *optstring) { static int sp = 1; /* position within argument */ register int osp; /* saved `sp' for param test */ #ifndef STRICT register int oind; /* saved `optind' for param test */ #endif register int c; /* option letter */ register char *cp; /* -> option in `optstring' */ optarg = NULL; /* initialise getopt vars */ if (optind == 0) { optind = 1; opterr = 1; optopt = 1; optarg = NULL; } if (sp == 1) { /* fresh argument */ if (optind >= argc /* no more arguments */ || argv[optind][0] != '-' /* no more options */ || argv[optind][1] == '\0' /* not option; stdin */ ) return EOF; else if (strcmp(argv[optind], "--") == 0) { ++optind; /* skip over "--" */ return EOF; /* "--" marks end of options */ } } c = argv[optind][sp]; /* option letter */ osp = sp++; /* get ready for next letter */ #ifndef STRICT oind = optind; /* save optind for param test */ #endif if (argv[optind][sp] == '\0') { /* end of argument */ ++optind; /* get ready for next try */ sp = 1; /* beginning of next argument */ } if (c == ':' || c == '?' /* optstring syntax conflict */ || (cp = strchr(optstring, c)) == NULL /* not found */ ) { return Err(argv[0], "illegal option", c); } if (cp[1] == ':') { /* option takes parameter */ #ifdef STRICT if (osp != 1) { return Err(argv[0], "option must not be clustered", c); } /* reset by end of argument */ if (sp != 1) { return Err(argv[0], "option must be followed by white space", c); } #else if (oind == optind) { /* argument w/o whitespace */ optarg = &argv[optind][sp]; sp = 1; /* beginning of next argument */ } else #endif if (optind >= argc) { return Err(argv[0], "option requires an argument", c); } else /* argument w/ whitespace */ optarg = argv[optind]; ++optind; /* skip over parameter */ } return c; }