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tgetopt.c
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tgetopt.c
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/*
* getopt replacement
*
* Tommy van Leeuwen <tommy@chiparus.org>
* 2004 March, 6th First Version, written because some OS'es lack getopt
*
* Create an array like this:
*
* struct option opts[] = {
* { "help", 0, NULL, 'h', 0 },
* { "config", 1, NULL, 'c', 0 },
* // Leave this last line
* { NULL, 0, NULL, 0, 0 },
* };
*
* int main(int argc, char **argc) {
* tgetopt(argc, argv);
* int = toptset('h');
* char* = toptargs('c');
* tfreeopt(); // clean up argument mem
* ...
* }
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "tgetopt.h"
char * toptargs(int opt) {
int j;
for( j=0; ;j++ ) {
if ( opts[j].longname == NULL && opts[j].shortname == 0 )
break;
if ( opts[j].shortname == opt )
return opts[j].args;
}
return NULL;
}
int toptset(int opt) {
int j;
for( j=0; ;j++ ) {
if ( opts[j].longname == NULL && opts[j].shortname == 0 )
break;
if ( opts[j].shortname == opt )
return opts[j].isset;
}
return 0;
}
void tgetopt(int argc, char **argv) {
int i,j;
char c;
char *p;
for(i=1; i<argc; i++) {
if ( argv[i][0] == '-' && argv[i][1] == '-' ) {
//longopt
p = argv[i]+2;
for( j=0; ;j++ ) {
if ( opts[j].longname == NULL && opts[j].shortname == 0 )
break;
if ( strcasecmp(opts[j].longname, p) == 0 ) {
//foundopt
if ( opts[j].hasargs == 1 ) {
if ( argv[i+1] == NULL || argv[i+1][0] == '-' ) {
fprintf(stderr,"Argument for option %s missing\n",
opts[j].longname);
exit(0);
}
opts[j].args = strdup(argv[++i]);
}
opts[j].isset++;
}
}
}else if ( argv[i][0] == '-' ) {
//shortopt
c = argv[i][1];
for( j=0; ;j++ ) {
if ( opts[j].longname == NULL && opts[j].shortname == 0 )
break;
if ( opts[j].shortname == c ) {
//foundopt
if ( opts[j].hasargs == 1 ) {
if ( argv[i][2] != 0 ) {
opts[j].args = strdup(argv[i]+2);
}else
if ( argv[i+1] != NULL && argv[i+1][0] != '-' ) {
opts[j].args = strdup(argv[++i]);
}else{
fprintf(stderr,"Argument for option %c missing\n",
opts[j].shortname);
exit(0);
}
}
opts[j].isset++;
}
}
}else {
fprintf(stderr, "getopt: Skipping unknown option %s\n", argv[i]);
}
}
}
void tfreeopt(void) {
int j;
for( j=0; ;j++ ) {
if ( opts[j].longname == NULL && opts[j].shortname == 0 )
break;
if ( opts[j].args != NULL )
free(opts[j].args);
}
}