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/*
* Copyright (C) 2004-2010 NVIDIA Corporation
*
* 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
*
*
* nvgetopt.c - portable getopt_long() replacement; removes the need
* for the stupid optstring argument.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "nvgetopt.h"
int nvgetopt(int argc,
char *argv[],
const NVGetoptOption *options,
char **strval,
int *boolval,
int *intval,
double *doubleval,
int *disable_val)
{
char *c, *a, *arg, *name = NULL, *argument=NULL;
int i, found = NVGETOPT_FALSE;
int ret = 0;
int negate = NVGETOPT_FALSE;
int disable = NVGETOPT_FALSE;
const NVGetoptOption *o = NULL;
static int argv_index = 0;
if (strval) *strval = NULL;
if (boolval) *boolval = NVGETOPT_FALSE;
if (intval) *intval = 0;
if (doubleval) *doubleval = 0.0;
if (disable_val) *disable_val = NVGETOPT_FALSE;
argv_index++;
/* if no more options, return -1 */
if (argv_index >= argc) return -1;
/* get the argument in question */
arg = strdup(argv[argv_index]);
/* look for "--" or "-" */
if ((arg[0] == '-') && (arg[1] == '-')) {
name = arg + 2;
} else if (arg[0] == '-') {
name = arg + 1;
} else {
fprintf(stderr, "%s: invalid option: \"%s\"\n", argv[0], arg);
goto done;
}
/*
* if there is an "=" in the string, then assign argument and zero
* out the equal sign so that name will match what is in the
* option table.
*/
c = name;
while (*c) {
if (*c == '=') { argument = c + 1; *c = '\0'; break; }
c++;
}
/*
* if the string is terminated after one character, interpret it
* as a short option. Otherwise, interpret it as a long option.
*/
if (name[1] == '\0') { /* short option */
for (i = 0; options[i].name; i++) {
if (options[i].val == name[0]) {
o = &options[i];
break;
}
}
} else { /* long option */
for (i = 0; options[i].name; i++) {
const char *tmpname;
int tmp_negate;
/*
* if this option allows negation by prepending with
* "--no-" (true for IS_BOOLEAN and ALLOW_DISABLE), then
* skip any leading "no-" in the argument
*/
if ((options[i].flags & (NVGETOPT_IS_BOOLEAN |
NVGETOPT_ALLOW_DISABLE)) &&
(name[0] == 'n') &&
(name[1] == 'o') &&
(name[2] == '-')) {
tmpname = name + 3;
tmp_negate = NVGETOPT_TRUE;
} else {
tmpname = name;
tmp_negate = NVGETOPT_FALSE;
}
if (strcmp(tmpname, options[i].name) == 0) {
o = &options[i];
negate = tmp_negate;
break;
}
}
}
/*
* if we didn't find a match, maybe this is multiple short options
* stored together; is each character a short option?
*/
if (!o) {
for (c = name; *c; c++) {
found = NVGETOPT_FALSE;
for (i = 0; options[i].name; i++) {
if (options[i].val == *c) {
found = NVGETOPT_TRUE;
break;
}
}
if (!found) break;
}
if (found) {
/*
* all characters individually are short options, so
* interpret them that way
*/
for (i = 0; options[i].name; i++) {
if (options[i].val == name[0]) {
/*
* don't allow options with arguments to be
* processed in this way
*/
if (options[i].flags & NVGETOPT_HAS_ARGUMENT) break;
/*
* remove the first short option from
* argv[argv_index]
*/
a = argv[argv_index];
if (a[0] == '-') a++;
if (a[0] == '-') a++;
if (a[0] == '+') a++;
while(a[0]) { a[0] = a[1]; a++; }
/*
* decrement argv_index so that we process this
* entry again
*/
argv_index--;
o = &options[i];
break;
}
}
}
}
/* if we didn't find an option, return */
if (!o) {
fprintf(stderr, "%s: unrecognized option: \"%s\"\n", argv[0], arg);
goto done;
}
/* if the option is boolean, record !negate as the boolean value */
if (o->flags & NVGETOPT_IS_BOOLEAN) {
if (boolval) *boolval = !negate;
}
/*
* if this option is flagged as "disable-able", then let the
* "--no-" prefix get interpreted to mean that the option should
* be disabled
*/
if ((o->flags & NVGETOPT_ALLOW_DISABLE) && (negate == NVGETOPT_TRUE)) {
disable = NVGETOPT_TRUE;
}
/*
* if the option takes an argument (either string or integer), and
* we haven't already decided to disable the option, then we
* either need to use what was after the "=" in this argv[] entry,
* or we need to pull the next entry off of argv[]
*/
if ((o->flags & NVGETOPT_HAS_ARGUMENT) && !disable) {
if (argument) {
if (!argument[0]) {
fprintf(stderr, "%s: option \"%s\" requires an "
"argument.\n", argv[0], arg);
goto done;
}
} else {
/*
* if the argument is optional, and we're either at the
* end of the argv list, or the next argv starts with '-',
* then assume there is no argument for this option
*/
if ((o->flags & NVGETOPT_ARGUMENT_IS_OPTIONAL) &&
((argv_index == (argc - 1)) ||
(argv[argv_index + 1][0] == '-'))) {
argument = NULL;
goto argument_processing_done;
} else {
argv_index++;
if (argv_index >= argc) {
fprintf(stderr, "%s: option \"%s\" requires an "
"argument.\n", argv[0], arg);
goto done;
}
argument = argv[argv_index];
}
}
/* argument is now a valid string: parse it */
if ((o->flags & NVGETOPT_INTEGER_ARGUMENT) && (intval)) {
/* parse the argument as an integer */
char *endptr;
*intval = (int) strtol(argument, &endptr, 0);
if (*endptr) {
fprintf(stderr, "%s: \"%s\" is not a valid argument for "
"option \"%s\".\n", argv[0], argument, arg);
goto done;
}
} else if ((o->flags & NVGETOPT_STRING_ARGUMENT) && (strval)) {
/* treat the argument as a string */
*strval = strdup(argument);
} else if ((o->flags & NVGETOPT_DOUBLE_ARGUMENT) && (doubleval)) {
/* parse the argument as a double */
char *endptr;
*doubleval = (double) strtod(argument, &endptr);
if (*endptr) {
fprintf(stderr, "%s: \"%s\" is not a valid argument for "
"option \"%s\".\n", argv[0], argument, arg);
goto done;
}
} else {
fprintf(stderr, "%s: error while assigning argument for "
"option \"%s\".\n", argv[0], arg);
goto done;
}
} else {
/* if we have an argument when we shouldn't; complain */
if (argument) {
fprintf(stderr, "%s: option \"%s\" does not take an argument, but "
"was given an argument of \"%s\".\n",
argv[0], arg, argument);
goto done;
}
}
argument_processing_done:
ret = o->val;
/* fall through */
done:
if (disable_val) *disable_val = disable;
free(arg);
return ret;
} /* nvgetopt() */
|
