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/*
* nvidia-installer: A tool for installing NVIDIA software packages on
* Unix and Linux systems.
*
* Copyright (C) 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"
/*
* nvgetopt() - see the glibc getopt_long(3) manpage for usage
* description. Options can be prepended with "--" or "-".
*
* A global variable stores the current index into the argv array, so
* subsequent calls to nvgetopt() will advance through argv[].
*
* On success, the matching NVGetoptOption.val is returned.
*
* On failure, an error is printed to stderr, and 0 is returned.
*
* When there are no more options to parse, -1 is returned.
*/
int nvgetopt(int argc, char *argv[], const NVGetoptOption *options,
char **strval)
{
char *c, *a, *arg, *name = NULL, *argument=NULL;
int i, found = NVGETOPT_FALSE, ret = 0;
const NVGetoptOption *o = NULL;
static int argv_index = 0;
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++) {
if (strcmp(options[i].name, name) == 0) {
o = &options[i];
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 takes an argument string, 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) {
if (argument) {
if (!argument[0]) {
fprintf(stderr, "%s: option \"%s\" requires an "
"argument.\n", argv[0], arg);
goto 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_STRING_ARGUMENT) && (strval)) {
*strval = strdup(argument);
} 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;
}
}
ret = o->val;
done:
free(arg);
return ret;
} /* nvgetopt() */
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