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/* Written by Kamila Szewczyk (k@iczelia.net) */
#ifndef _YARG_H
#define _YARG_H
#include <stdio.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
typedef enum {
no_argument,
required_argument,
optional_argument
} yarg_arg_type;
typedef struct {
int opt;
yarg_arg_type type;
const char * long_opt;
} yarg_options;
typedef enum {
YARG_STYLE_WINDOWS,
YARG_STYLE_UNIX,
YARG_STYLE_UNIX_SHORT
} yarg_style;
typedef struct {
bool dash_dash;
yarg_style style;
} yarg_settings;
typedef struct {
int opt;
const char * long_opt;
char * arg;
} yarg_option;
typedef struct {
yarg_option * args;
int argc;
char ** pos_args;
int pos_argc;
char * error;
} yarg_result;
static const char yarg_oom[] = "Out of memory";
static int yarg_asprintf(char ** strp, const char * fmt, ...) {
if (fmt == yarg_oom)
goto use_yarg_oom;
va_list ap;
va_start(ap, fmt);
int len = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (len < 0)
goto use_yarg_oom;
*strp = (char *) malloc(len + 1);
if (!*strp)
goto use_yarg_oom;
va_start(ap, fmt);
len = vsnprintf(*strp, len + 1, fmt, ap);
va_end(ap);
return len;
use_yarg_oom:
*strp = (char *)yarg_oom;
return sizeof(yarg_oom);
}
static char * yarg_strdup(const char * str) {
char * new_str = (char *) calloc(strlen(str) + 1, 1);
if (!new_str) return NULL;
strcpy(new_str, str);
return new_str;
}
static int yarg_parse_unix(int argc, char * argv[], yarg_options opt[],
yarg_result * res, bool dash_dash) {
int no_args = 0, no_pos_args = 0;
for (int i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
if (argv[i][1] == '-') {
if (dash_dash && argv[i][2] == '\0')
{ no_pos_args += argc - i - 1; break; }
char * long_opt = argv[i] + 2; yarg_options * o = NULL;
int len = 0; while (long_opt[len] && long_opt[len] != '=') len++;
for (int j = 0; opt[j].opt; j++)
if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len))
{ o = &opt[j]; break; }
if (!o) {
yarg_asprintf(&res->error, "--%.*s -- unknown option\n", len, long_opt);
return 0;
}
if (o->type == required_argument) {
if (long_opt[len] == '=') {
// Ignore.
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
i++;
} else {
yarg_asprintf(&res->error, "--%s -- missing argument\n", o->long_opt);
return 0;
}
} else if (o->type == optional_argument) {
if (long_opt[len] == '=') {
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
i++;
}
}
no_args++;
} else {
for (int j = 1; argv[i][j]; j++) {
char c = argv[i][j]; yarg_options * o = NULL;
for (int k = 0; opt[k].opt; k++)
if (opt[k].opt == c)
{ o = &opt[k]; break; }
if (!o) {
yarg_asprintf(&res->error, "-%c -- unknown option\n", c);
return 0;
}
if (o->type == required_argument) {
if (argv[i][j + 1]) {
// Ignore.
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
i++;
} else {
yarg_asprintf(&res->error, "-%c -- missing argument\n", c);
return 0;
}
no_args++;
break;
} else if(o->type == optional_argument) {
if (argv[i][j + 1]) {
// Ignore.
no_args++;
break;
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
i++;
no_args++;
break;
}
}
no_args++;
}
}
} else no_pos_args++;
}
res->args = (yarg_option *) calloc((no_args + 1) * sizeof(yarg_option), 1);
res->pos_args = (char **) calloc((no_pos_args + 1) * sizeof(char *), 1);
if(!res->args || !res->pos_args) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
for (int i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
if (argv[i][1] == '-') {
if (dash_dash && argv[i][2] == '\0') {
for (int j = i + 1; j < argc; j++)
if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[j]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
break;
}
char * long_opt = argv[i] + 2; yarg_options * o = NULL;
int len = 0; while (long_opt[len] && long_opt[len] != '=') len++;
for (int j = 0; opt[j].opt; j++)
if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len))
{ o = &opt[j]; break; }
res->args[res->argc].opt = o->opt;
res->args[res->argc].long_opt = o->long_opt;
if (o->type == required_argument || o->type == optional_argument) {
if (long_opt[len] == '=') {
if(!(res->args[res->argc].arg = yarg_strdup(long_opt + len + 1))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
if(!(res->args[res->argc].arg = yarg_strdup(argv[++i]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
}
}
res->argc++;
} else {
for (int j = 1; argv[i][j]; j++) {
char c = argv[i][j]; yarg_options * o = NULL;
for (int k = 0; opt[k].opt; k++)
if (opt[k].opt == c)
{ o = &opt[k]; break; }
if (!o) {
yarg_asprintf(&res->error, "-%c -- unknown option\n", c);
return 0;
}
res->args[res->argc].opt = c;
res->args[res->argc].long_opt = o->long_opt;
if (o->type == required_argument || o->type == optional_argument) {
if (argv[i][j + 1]) {
if(!(res->args[res->argc++].arg = yarg_strdup(argv[i] + j + 1))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
break;
} else if (argv[i + 1] && argv[i + 1][0] != '-') {
if(!(res->args[res->argc++].arg = yarg_strdup(argv[++i]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
break;
}
}
res->argc++;
}
}
} else if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[i]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
}
return 1;
}
static int yarg_parse_unix_short(int argc, char * argv[], yarg_options opt[],
yarg_result * res, bool dash_dash, char opt_char) {
int no_args = 0, no_pos_args = 0;
for (int i = 1; i < argc; i++) {
if (argv[i][0] == opt_char) {
if (dash_dash && argv[i][1] == '\0') {
no_pos_args += argc - i - 1;
break;
}
char * long_opt = argv[i] + 1; yarg_options * o = NULL;
int len = 0; while (long_opt[len] && long_opt[len] != '=') len++;
for (int j = 0; opt[j].opt; j++)
if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len))
{ o = &opt[j]; break; }
if (!o) {
yarg_asprintf(&res->error, "%c%.*s -- unknown option\n", opt_char, len, long_opt);
return 0;
}
if (o->type == required_argument) {
if (long_opt[len] == '=') {
// Ignore.
} else if (argv[i + 1] && argv[i + 1][0] != opt_char) {
i++;
} else {
yarg_asprintf(&res->error, "%c%s -- missing argument\n", opt_char, o->long_opt);
return 0;
}
} else if (o->type == optional_argument) {
if (long_opt[len] == '=') {
// Ignore.
} else if (argv[i + 1] && argv[i + 1][0] != opt_char) {
i++;
}
}
no_args++;
} else no_pos_args++;
}
res->args = (yarg_option *) calloc((no_args + 1) * sizeof(yarg_option), 1);
res->pos_args = (char **) calloc((no_pos_args + 1) * sizeof(char *), 1);
if (!res->args || !res->pos_args) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
for (int i = 1; i < argc; i++) {
if (argv[i][0] == opt_char) {
if (dash_dash && argv[i][1] == '\0') {
for (int j = i + 1; j < argc; j++)
if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[j]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
break;
}
char * long_opt = argv[i] + 1; yarg_options * o = NULL;
int len = 0; while (long_opt[len] && long_opt[len] != '=') len++;
for (int j = 0; opt[j].opt; j++)
if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len))
{ o = &opt[j]; break; }
res->args[res->argc].opt = o->opt;
res->args[res->argc].long_opt = o->long_opt;
if (o->type == required_argument || o->type == optional_argument) {
if (long_opt[len] == '=') {
if(!(res->args[res->argc].arg = yarg_strdup(long_opt + len + 1))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
} else if (argv[i + 1] && argv[i + 1][0] != opt_char) {
if(!(res->args[res->argc].arg = yarg_strdup(argv[++i]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
}
}
res->argc++;
} else if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[i]))) {
yarg_asprintf(&res->error, yarg_oom);
return 0;
}
}
return 1;
}
void yarg_destroy(yarg_result * r) {
if(r) {
if(r->args) {
for (int i = 0; i < r->argc; i++) {
free(r->args[i].arg);
}
}
free(r->args);
if(r->pos_args) {
for (int i = 0; i < r->pos_argc; i++) {
free(r->pos_args[i]);
}
}
free(r->pos_args);
if (r->error != yarg_oom)
free(r->error);
}
free(r);
}
yarg_result * yarg_parse(int argc, char * argv[], yarg_options opt[], yarg_settings settings) {
yarg_result * res = (yarg_result *) calloc(sizeof(yarg_result), 1);
if (!res) return NULL;
switch (settings.style) {
case YARG_STYLE_WINDOWS:
yarg_parse_unix_short(argc, argv, opt, res, false, '/');
break;
case YARG_STYLE_UNIX:
yarg_parse_unix(argc, argv, opt, res, settings.dash_dash);
break;
case YARG_STYLE_UNIX_SHORT:
yarg_parse_unix_short(argc, argv, opt, res, settings.dash_dash, '-');
break;
}
return res;
}
#endif
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