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/*
* Copyright 2005 Timo Hirvonen
*/
#include <prog.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>
char *program_name = NULL;
void warn(const char *format, ...)
{
va_list ap;
fprintf(stderr, "%s: ", program_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
}
void warn_errno(const char *format, ...)
{
int e = errno;
va_list ap;
fprintf(stderr, "%s: ", program_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fprintf(stderr, ": %s\n", strerror(e));
}
void __NORETURN die(const char *format, ...)
{
va_list ap;
fprintf(stderr, "%s: ", program_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
exit(1);
}
void __NORETURN die_errno(const char *format, ...)
{
int e = errno;
va_list ap;
fprintf(stderr, "%s: ", program_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fprintf(stderr, ": %s\n", strerror(e));
exit(1);
}
static int short_option(int ch, const struct option *options)
{
int i;
for (i = 0; ; i++) {
if (!options[i].short_opt) {
if (!options[i].long_opt)
die("unrecognized option `-%c'\n", ch);
continue;
}
if (options[i].short_opt != ch)
continue;
return i;
}
}
static int long_option(const char *opt, const struct option *options)
{
int len, i, idx, num;
len = strlen(opt);
idx = -1;
num = 0;
for (i = 0; options[i].short_opt || options[i].long_opt; i++) {
if (options[i].long_opt && strncmp(opt, options[i].long_opt, len) == 0) {
idx = i;
num++;
if (options[i].long_opt[len] == 0) {
/* exact */
num = 1;
break;
}
}
}
if (num > 1)
die("option `--%s' is ambiguous\n", opt);
if (num == 0)
die("unrecognized option `--%s'\n", opt);
return idx;
}
int get_option(char **argvp[], const struct option *options, char **arg)
{
char **argv = *argvp;
const char *opt = *argv;
int i;
*arg = NULL;
if (opt == NULL || opt[0] != '-' || opt[1] == 0)
return -1;
if (opt[1] == '-') {
if (opt[2] == 0) {
/* '--' => no more options */
*argvp = argv + 1;
return -1;
}
i = long_option(opt + 2, options);
} else if (opt[2]) {
return -1;
} else {
i = short_option(opt[1], options);
}
argv++;
if (options[i].has_arg) {
if (*argv == NULL)
die("option `%s' requires an argument\n", opt);
*arg = *argv++;
}
*argvp = argv;
return i;
}
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