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/*****************************************************************************
* getopt.c - competent and free getopt library.
* $Header: /cvsroot/freegetopt/freegetopt/getopt.c,v 1.2 2003/10/26 03:10:20 vindaci Exp $
*
* Copyright (c)2002-2003 Mark K. Kim
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the original author of this software nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cairo-boilerplate-getopt.h"
char* optarg = NULL;
int optind = 0;
int opterr = 1;
int optopt = '?';
static char** prev_argv = NULL; /* Keep a copy of argv and argc to */
static int prev_argc = 0; /* tell if getopt params change */
static int argv_index = 0; /* Option we're checking */
static int argv_index2 = 0; /* Option argument we're checking */
static int opt_offset = 0; /* Index into compounded "-option" */
static int dashdash = 0; /* True if "--" option reached */
static int nonopt = 0; /* How many nonopts we've found */
static void increment_index(void)
{
/* Move onto the next option */
if(argv_index < argv_index2)
while(prev_argv[++argv_index] && prev_argv[argv_index][0] != '-'
&& argv_index < argv_index2+1);
}
else argv_index++;
opt_offset = 1;
/*
* Permutes argv[] so that the argument currently being processed is moved
* to the end.
static int permute_argv_once(void)
/* Movability check */
if(argv_index + nonopt >= prev_argc) return 1;
/* Move the current option to the end, bring the others to front */
else
char* tmp = prev_argv[argv_index];
/* Move the data */
memmove(&prev_argv[argv_index], &prev_argv[argv_index+1],
sizeof(char**) * (prev_argc - argv_index - 1));
prev_argv[prev_argc - 1] = tmp;
nonopt++;
return 0;
int _cairo_getopt(int argc, char** argv, const char* optstr)
int c = 0;
/* If we have new argv, reinitialize */
if(prev_argv != argv || prev_argc != argc)
/* Initialize variables */
prev_argv = argv;
prev_argc = argc;
argv_index = 1;
argv_index2 = 1;
dashdash = 0;
nonopt = 0;
/* Jump point in case we want to ignore the current argv_index */
getopt_top:
/* Misc. initializations */
optarg = NULL;
/* Dash-dash check */
if(argv[argv_index] && !strcmp(argv[argv_index], "--"))
dashdash = 1;
increment_index();
/* If we're at the end of argv, that's it. */
if(argv[argv_index] == NULL)
c = -1;
/* Are we looking at a string? Single dash is also a string */
else if(dashdash || argv[argv_index][0] != '-' || !strcmp(argv[argv_index], "-"))
/* If we want a string... */
if(optstr[0] == '-')
c = 1;
optarg = argv[argv_index];
/* If we really don't want it (we're in POSIX mode), we're done */
else if(optstr[0] == '+' || getenv("POSIXLY_CORRECT"))
/* Everything else is a non-opt argument */
nonopt = argc - argv_index;
/* If we mildly don't want it, then move it back */
if(!permute_argv_once()) goto getopt_top;
else c = -1;
/* Otherwise we're looking at an option */
char* opt_ptr = NULL;
/* Grab the option */
c = argv[argv_index][opt_offset++];
/* Is the option in the optstr? */
if(optstr[0] == '-') opt_ptr = strchr(optstr+1, c);
else opt_ptr = strchr(optstr, c);
/* Invalid argument */
if(!opt_ptr)
if(opterr)
fprintf(stderr, "%s: invalid option -- %c\n", argv[0], c);
optopt = c;
c = '?';
/* Option takes argument */
else if(opt_ptr[1] == ':')
/* ie, -oARGUMENT, -xxxoARGUMENT, etc. */
if(argv[argv_index][opt_offset] != '\0')
optarg = &argv[argv_index][opt_offset];
/* ie, -o ARGUMENT (only if it's a required argument) */
else if(opt_ptr[2] != ':')
/* One of those "you're not expected to understand this" moment */
if(argv_index2 < argv_index) argv_index2 = argv_index;
while(argv[++argv_index2] && argv[argv_index2][0] == '-');
optarg = argv[argv_index2];
/* Don't cross into the non-option argument list */
if(argv_index2 + nonopt >= prev_argc) optarg = NULL;
/* In case we got no argument for an option with required argument */
if(optarg == NULL && opt_ptr[2] != ':')
fprintf(stderr,"%s: option requires an argument -- %c\n",
argv[0], optopt);
/* Option does not take argument */
/* Next argv_index */
if(argv[argv_index][opt_offset] == '\0')
/* Calculate optind */
if(c == -1)
optind = argc - nonopt;
optind = argv_index;
return c;
/* vim:ts=3