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/* getopts.c - Command line argument parser
*
* Whom: Steve Mertz <steve@dragon-ware.com>
* Date: 20010111
* Why: Because I couldn't find one that I liked. So I wrote this one.
*
*/
/*
* Copyright (c) 2001, 2002, Steve Mertz <steve@dragon-ware.com>
* 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 name of Dragon Ware 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 REGENTS
* 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 "getopts.h"
int option_index = 1;
/* int getopts_usage()
*
* Returns: 1 - Successful
*/
int getopts_usage(char *progName, struct options opts[])
{
int count;
printf("Usage: %s [options]\n\n", progName);
printf(" --help,\t-h\t\t\tDisplays this information\n");
for (count = 0; opts[count].description; count++)
{
char *cmd = 0;
if (opts[count].name && opts[count].shortName)
{
cmd = calloc(1, strlen(opts[count].name) + strlen(opts[count].shortName) + 15);
if (opts[count].args)
{
sprintf(cmd, "--%s,\t-%s <args>\t\t", opts[count].name, opts[count].shortName);
}
else
{
sprintf(cmd, "--%s,\t-%s\t\t\t", opts[count].name, opts[count].shortName);
}
}
else if (opts[count].name)
{
cmd = calloc(1, strlen(opts[count].name) + 15);
if (opts[count].args)
{
sprintf(cmd, "--%s <args>\t\t\t", opts[count].name);
}
else
{
sprintf(cmd, "--%s\t\t\t", opts[count].name);
}
}
else if (opts[count].shortName)
{
cmd = calloc(1, strlen(opts[count].shortName) + 15);
if (opts[count].args)
{
sprintf(cmd, "\t\t-%s <args>\t\t", opts[count].shortName);
}
else
{
sprintf(cmd, "\t\t-%s\t\t\t", opts[count].shortName);
}
}
if(cmd)
{
printf(" %s%s\n", cmd, opts[count].description);
free(cmd);
}
}
return 1;
}
/* int getopts()
*
* Returns: -1 - Couldn't allocate memory. Please handle me.
* 0 - No arguements to parse
* # - The number in the struct for the matched arg.
*
*/
int getopts(int argc, char **argv, struct options opts[], char **args)
{
int count1 = 0;
size_t sizeOfArgs = 0;
if (argc == 1 || option_index == argc)
return 0;
/* Search for '-h' or '--help' first. Then we can just exit */
for (count1 = 1; count1 < argc; count1++)
{
if (!strcmp(argv[count1], "-h") || !strcmp(argv[count1], "--help"))
{
useage:
getopts_usage(argv[0], opts);
exit(0);
}
}
/* End of -h --help section */
*args = NULL;
if (option_index <= argc)
{
for (count1 = 0; opts[count1].description; count1++)
{
if ((opts[count1].name && !strcmp(opts[count1].name,
(argv[option_index]+2))) ||
(opts[count1].shortName && !strcmp(opts[count1].shortName,
(argv[option_index]+1))))
{
if (opts[count1].args)
{
option_index++;
if (option_index >= argc)
goto useage;
/* This grossness that follows is to supporte having a '-' in the
argument. It's all squished together like this because I use
an 80 char wide screen for my coding. If you don't like it, help
yourself to fixing it so you do. */
if (*argv[option_index] == '-')
{
int optionSeeker;
for (optionSeeker = 0; opts[optionSeeker].description;
optionSeeker++)
{
if ((opts[optionSeeker].name &&
!strcmp(opts[optionSeeker].name,
(argv[option_index]+2))) ||
(opts[optionSeeker].shortName &&
!strcmp(opts[optionSeeker].shortName,
(argv[option_index]+1))))
{
goto useage;
}
}
/* End of gross hack for supporting '-' in arguments. */
}
sizeOfArgs = strlen(argv[option_index]);
if ((*args = calloc(1, sizeOfArgs+1)) == NULL)
return -1;
strncpy(*args, argv[option_index], sizeOfArgs);
}
option_index++;
return opts[count1].number;
}
}
}
return 0;
}
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