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/*
* cmdline.c -- parse a command line using getopt, environment and defaults
*
* Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
* Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
* Copyright (c) 2010, 2011 Giuseppe Scrivano (gscrivano@gnu.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* Changes:
* Michele Comitini (mcm@glisco.it): better handling of numeric type args.
*/
#include "barcode.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "cmdline.h"
/* In case of error, print help string and return error (-1) */
int commandline_errormsg(FILE *f, struct commandline *args,
char *prgname, char *messagehead)
{
char *buffer;
char *buffer2;
int len;
struct commandline *ptr;
if (!messagehead) {
fprintf(f, _("%s: Error in cmdline\nPossible options:\n"), prgname);
} else {
fprintf(f,"%s: %s",prgname, messagehead);
}
for (ptr = args; ptr->option; ptr++) {
if (_(ptr->descrip)) {
len = strlen(_(ptr->descrip));
len += ptr->default_v ? strlen(ptr->default_v) : 6;
len += ptr->env ? strlen(ptr->env) : 6;
buffer2 = malloc(len+3); /* 3 to be safe :) */
len += 32;
if (buffer2) {
buffer = malloc(len);
if (buffer) {
sprintf(buffer2, _(ptr->descrip),
ptr->default_v ? ptr->default_v : "(none)",
ptr->env ? ptr->env : "(none)");
sprintf(buffer, " -%c %s %s", ptr->option,
ptr->type ? "<arg>" : " ", buffer2);
fprintf(f, "%s\n",buffer);
free(buffer);
}
free(buffer2);
}
}
}
return -1;
}
/*
* Associate formats to type.
*/
struct type_fmt {
enum option_type type;
char *fmt;
};
static struct type_fmt formats[] = {
{CMDLINE_I, "%i%s"}, /* the trailing "%s" is used for error check */
{CMDLINE_D, "%d%s"},
{CMDLINE_X, "%x%s"},
{CMDLINE_O, "%o%s"},
{CMDLINE_F, "%lf%s"},
{CMDLINE_P, "%p%s"},
{0, NULL} /* If we get here, it's CMDLINE_S: no sscanf buf strcpy() */
};
/* Parse one argument (default or provided) */
static int commandline_oneopt(struct commandline *ptr, char *value)
{
struct type_fmt *tptr;
char *trash = value ? strdup(value) : NULL;
/* convert it, if needed */
if ((ptr->type != CMDLINE_NONE) && ptr->result) {
for (tptr = formats; tptr->type; tptr++)
if (tptr->type == ptr->type)
break;
if (!tptr->type) /* not found: it is a string */
*(char **)(ptr->result) = value;
else
if (sscanf(value, tptr->fmt, ptr->result, trash)!=1) {
free(trash);
return -1;
}
}
if (trash)
free(trash);
if ((ptr->type == CMDLINE_NONE) && ptr->result) /* no type, just count */
(*(int *)(ptr->result))++;
/* call the function, if needed */
if (ptr->fun) {
if (ptr->type) {
if (ptr->result) return ptr->fun(ptr->result); /* converted */
return ptr->fun(value); /* type, but not converted */
}
return ptr->fun(NULL); /* no type: just call it */
}
return 0;
}
/* The main function */
int commandline(struct commandline *args, int argc, char **argv,
char *errorhead)
{
struct commandline *ptr;
char *getopt_desc = (char *)calloc(512, 1);
int desc_offset = 0;
int opt, retval;
char *value;
/* Build getopt string and process defaults values */
for (ptr = args; ptr->option; ptr++) {
getopt_desc[desc_offset++] = ptr->option;
if (ptr->type) getopt_desc[desc_offset++] = ':';
value = NULL;
if (ptr->env)
value = getenv(ptr->env);
if (!value)
value = ptr->default_v;
if (value && (retval = commandline_oneopt(ptr, value))) {
/*
* if the function returns a specific (not -1) value, it already
* printed its message, so avoid the generic help
*/
if (retval == -1)
commandline_errormsg(stderr, args, argv[0], errorhead);
return retval;
}
}
/* Run getopt and process material */
while ((opt = getopt(argc, argv, getopt_desc)) != -1) {
for (ptr = args; ptr->option; ptr++)
if (opt == ptr->option)
break;
if (!ptr->option) /* unknown option */
return commandline_errormsg(stderr, args, argv[0], errorhead);
if ( (retval = commandline_oneopt(ptr, optarg)) ) { /* wrong arg */
if (retval == -1)
commandline_errormsg(stderr, args, argv[0], errorhead);
return retval;
}
}
return 0;
}
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