/* Copyright (C) 2003 Manuel Novoa III * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* ATTENTION! ATTENTION! ATTENTION! ATTENTION! ATTENTION! * * Besides uClibc, I'm using this code in my libc for elks, which is * a 16-bit environment with a fairly limited compiler. It would make * things much easier for me if this file isn't modified unnecessarily. * In particular, please put any new or replacement functions somewhere * else, and modify the makefile to use your version instead. * Thanks. Manuel * * ATTENTION! ATTENTION! ATTENTION! ATTENTION! ATTENTION! */ /* Sep 7, 2003 * Initial version of a SUSv3 compliant getopt(). */ #define _GNU_SOURCE #include <unistd.h> #include <string.h> #include <stdio.h> #ifdef __UCLIBC_MJN3_ONLY__ #warning TODO: Enable gettext awareness. #endif /* __UCLIBC_MJN3_ONLY__ */ #undef _ #define _(X) X #ifdef __BCC__ static const char missing[] = "option requires an argument"; static const char illegal[] = "illegal option"; #else static const char missing[] = "%s: option requires an argument -- %c\n"; static const char illegal[] = "%s: illegal option -- %c\n"; #endif int opterr = 1; int optind = 1; int optopt = 0; char *optarg = NULL; int getopt(int argc, char * const argv[], const char *optstring) { static const char *o; /* multi opt position */ register const char *p; register const char *s; int retval = -1; optopt = 0; optarg = NULL; if (!o) { /* Not in a multi-option arg. */ if ((optind >= argc) /* No more args? */ || ((p = argv[optind]) == NULL) /* Missing? */ || (*p != '-') /* Not an option? */ || (!*++p) /* "-" case? */ ) { goto DONE; } if ((*p == '-') && (p[1] == 0)) { /* "--" case. */ /* ++optind; */ /* goto DONE; */ goto NEXTOPT; /* Less code generated... */ } o = p; } #ifdef __BCC__ p = o; /* Sigh... Help out bcc. */ #define o p #endif retval = (unsigned char) *o; /* Avoid problems for char val of -1. */ if ((*o == ':') || !(s = __strchr(optstring, *o))) { /* Illegal option? */ s = illegal; retval = '?'; goto BAD; } if (s[1] == ':') { /* Option takes an arg? */ if (o[1]) { /* No space between option and arg? */ optarg = (char *)(o + 1); goto NEXTOPT; } if (optind + 1 < argc) { /* Space between option and arg? */ optarg = argv[++optind]; } else { /* Out of args! */ s = missing; retval = ':'; BAD: optopt = *o; if (*optstring != ':') { retval = '?'; if (opterr) { #ifdef __BCC__ fprintf(stderr, "%s: %s -- %c\n", argv[0], s, *o); #else fprintf(stderr, _(s), argv[0], *o); #endif } } } } #ifdef __BCC__ #undef o #endif if (!*++o) { NEXTOPT: o = NULL; ++optind; } DONE: return retval; }