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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct {
int argc;
char **argv;
const char *options_with_value;
const char *option;
const char *value;
int i;
unsigned char no_option;
} ArgParser;
static int arg_parser_next(ArgParser *parser) {
top:
if (parser->i <= 0)
parser->i = 1;
if (parser->i >= parser->argc)
return 0;
const char *const arg = parser->argv[parser->i++];
if (parser->no_option)
goto no_option;
if (arg[0] == '-') {
const char *option = arg + 1;
if (option[0] == '-') {
option += 1;
}
if (option[0] == '\0') {
parser->no_option = 1;
goto top;
}
int requires_arg = 0;
const char *p = parser->options_with_value;
while (p && *p) {
size_t n = strcspn(p, ",");
if (strncmp(p, option, n) == 0 && option[n] == 0) {
requires_arg = 1;
break;
}
p += n;
while (*p == ',')
p += 1;
}
if (requires_arg) {
parser->option = option;
if (parser->i >= parser->argc) {
fprintf(stderr, "Error: no value provided for option %s\n", option);
exit(EXIT_FAILURE);
}
parser->value = parser->argv[parser->i++];
} else {
parser->option = option;
parser->value = 0;
}
return 1;
}
no_option:
parser->option = 0;
parser->value = arg;
return 1;
}
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