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getopt.c
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getopt.c
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/* $Id$ */
/*
** Copyright (C) 2002 Martin Roesch <roesch@sourcefire.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h> /* for EOF */
#include <string.h> /* for strchr() */
#ifdef WIN32
#include <windows.h> /* for TEXT */
#include <stdlib.h>
#endif
#include "getopt.h"
/* static (global) variables that are specified as exported by getopt() */
char *optarg = NULL; /* pointer to the start of the option argument */
int optind = 1; /* number of the next argv[] to be evaluated */
int optopt = 0;
int opterr = 1; /* non-zero if a question mark should be returned
when a non-valid option character is detected */
int optopt;
int getopt(int argc, char *argv[], const char *opstring)
{
static char *pIndexPosition = NULL; /* place inside current argv string */
char *pArgString = NULL; /* where to start from next */
char *pOptString; /* the string in our program */
if (pIndexPosition != NULL) {
/* we last left off inside an argv string */
if (*(++pIndexPosition)) {
/* there is more to come in the most recent argv */
pArgString = pIndexPosition;
}
}
if (pArgString == NULL) {
/* we didn't leave off in the middle of an argv string */
if (optind >= argc) {
/* more command-line arguments than the argument count */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all command-line arguments */
}
/*---------------------------------------------------------------------
* If the next argv[] is not an option, there can be no more options.
*-------------------------------------------------------------------*/
pArgString = argv[optind++]; /* set this to the next argument ptr */
if (('/' != *pArgString) && /* doesn't start with a slash or a dash? */
('-' != *pArgString)) {
--optind; /* point to current arg once we're done */
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all the command-line flags */
}
/* check for special end-of-flags markers */
if ((strcmp(pArgString, "-") == 0) ||
(strcmp(pArgString, "--") == 0)) {
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* encountered the special flag */
}
pArgString++; /* look past the / or - */
}
if (':' == *pArgString) { /* is it a colon? */
/*---------------------------------------------------------------------
* Rare case: if opterr is non-zero, return a question mark;
* otherwise, just return the colon we're on.
*-------------------------------------------------------------------*/
optopt = *pArgString;
return (opterr ? (int)'?' : (int)':');
}
else if ((pOptString = strchr(opstring, *pArgString)) == 0) {
/*---------------------------------------------------------------------
* The letter on the command-line wasn't any good.
*-------------------------------------------------------------------*/
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
optopt = *pArgString;
return (opterr ? (int)'?' : (int)*pArgString);
}
else {
/*---------------------------------------------------------------------
* The letter on the command-line matches one we expect to see
*-------------------------------------------------------------------*/
if (':' == _next_char(pOptString)) { /* is the next letter a colon? */
/* It is a colon. Look for an argument string. */
if ('\0' != _next_char(pArgString)) { /* argument in this argv? */
optarg = &pArgString[1]; /* Yes, it is */
}
else {
/*-------------------------------------------------------------
* The argument string must be in the next argv.
* But, what if there is none (bad input from the user)?
* In that case, return the letter, and optarg as NULL.
*-----------------------------------------------------------*/
if (optind < argc)
optarg = argv[optind++];
else {
optarg = NULL;
optopt = *pArgString;
return (opterr ? (int)'?' : (int)*pArgString);
}
}
pIndexPosition = NULL; /* not in the middle of anything */
}
else {
/* it's not a colon, so just return the letter */
optarg = NULL; /* no argument follows the option */
pIndexPosition = pArgString; /* point to the letter we're on */
}
return (int)*pArgString; /* return the letter that matched */
}
}
#ifdef WIN32
/* static (global) variables that are specified as exported by getopt() */
wchar_t *optarg_w = NULL; /* pointer to the start of the option argument */
int optind_w = 1; /* number of the next argv[] to be evaluated */
int optopt_w = 0;
int getopt_w(int argc, wchar_t *argv[], const wchar_t *opstring)
{
static wchar_t *pIndexPosition = NULL; /* place inside current argv string */
wchar_t *pArgString = NULL; /* where to start from next */
wchar_t *pOptString; /* the string in our program */
if (pIndexPosition != NULL) {
/* we last left off inside an argv string */
if (*(++pIndexPosition)) {
/* there is more to come in the most recent argv */
pArgString = pIndexPosition;
}
}
if (pArgString == NULL) {
/* we didn't leave off in the middle of an argv string */
if (optind_w >= argc) {
/* more command-line arguments than the argument count */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all command-line arguments */
}
/*---------------------------------------------------------------------
* If the next argv[] is not an option, there can be no more options.
*-------------------------------------------------------------------*/
pArgString = argv[optind_w++]; /* set this to the next argument ptr */
if (('/' != *pArgString) && /* doesn't start with a slash or a dash? */
('-' != *pArgString)) {
--optind_w; /* point to current arg once we're done */
optarg_w = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all the command-line flags */
}
/* check for special end-of-flags markers */
if ((wcscmp(pArgString, TEXT("-")) == 0) ||
(wcscmp(pArgString, TEXT("--")) == 0)) {
optarg_w = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* encountered the special flag */
}
pArgString++; /* look past the / or - */
}
if (TEXT(':') == *pArgString) { /* is it a colon? */
/*---------------------------------------------------------------------
* Rare case: if opterr is non-zero, return a question mark;
* otherwise, just return the colon we're on.
*-------------------------------------------------------------------*/
optopt_w = *pArgString;
return (opterr ? (int)TEXT('?') : (int)TEXT(':'));
}
else if ((pOptString = wcschr(opstring, *pArgString)) == 0) {
/*---------------------------------------------------------------------
* The letter on the command-line wasn't any good.
*-------------------------------------------------------------------*/
optarg_w = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
optopt_w = *pArgString;
return (opterr ? (int)TEXT('?') : (int)*pArgString);
}
else {
/*---------------------------------------------------------------------
* The letter on the command-line matches one we expect to see
*-------------------------------------------------------------------*/
if (TEXT(':') == _next_char(pOptString)) { /* is the next letter a colon? */
/* It is a colon. Look for an argument string. */
if (TEXT('\0') != _next_char(pArgString)) { /* argument in this argv? */
optarg_w = &pArgString[1]; /* Yes, it is */
}
else {
/*-------------------------------------------------------------
* The argument string must be in the next argv.
* But, what if there is none (bad input from the user)?
* In that case, return the letter, and optarg_w as NULL.
*-----------------------------------------------------------*/
if (optind_w < argc)
optarg_w = argv[optind_w++];
else {
optarg_w = NULL;
optopt_w = *pArgString;
return (opterr ? (int)TEXT('?') : (int)*pArgString);
}
}
pIndexPosition = NULL; /* not in the middle of anything */
}
else {
/* it's not a colon, so just return the letter */
optarg_w = NULL; /* no argument follows the option */
pIndexPosition = pArgString; /* point to the letter we're on */
}
return (int)*pArgString; /* return the letter that matched */
}
}
#endif