| 1 | /* Written by Kamila Szewczyk (k@iczelia.net) */ |
| 2 | |
| 3 | #ifndef _YARG_H |
| 4 | #define _YARG_H |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdbool.h> |
| 8 | #include <stdarg.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | #include <limits.h> |
| 12 | |
| 13 | typedef enum { |
| 14 | no_argument, |
| 15 | required_argument, |
| 16 | optional_argument |
| 17 | } yarg_arg_type; |
| 18 | |
| 19 | typedef struct { |
| 20 | int opt; |
| 21 | yarg_arg_type type; |
| 22 | const char * long_opt; |
| 23 | } yarg_options; |
| 24 | |
| 25 | typedef enum { |
| 26 | YARG_STYLE_WINDOWS, |
| 27 | YARG_STYLE_UNIX, |
| 28 | YARG_STYLE_UNIX_SHORT |
| 29 | } yarg_style; |
| 30 | |
| 31 | typedef struct { |
| 32 | bool dash_dash; |
| 33 | yarg_style style; |
| 34 | } yarg_settings; |
| 35 | |
| 36 | typedef struct { |
| 37 | int opt; |
| 38 | const char * long_opt; |
| 39 | char * arg; |
| 40 | } yarg_option; |
| 41 | |
| 42 | typedef struct { |
| 43 | yarg_option * args; |
| 44 | int argc; |
| 45 | char ** pos_args; |
| 46 | int pos_argc; |
| 47 | char * error; |
| 48 | } yarg_result; |
| 49 | |
| 50 | static const char yarg_oom[] = "Out of memory"; |
| 51 | static int yarg_asprintf(char ** strp, const char * fmt, ...) { |
| 52 | if (fmt == yarg_oom) |
| 53 | goto use_yarg_oom; |
| 54 | va_list ap; |
| 55 | va_start(ap, fmt); |
| 56 | int len = vsnprintf(NULL, 0, fmt, ap); |
| 57 | va_end(ap); |
| 58 | if (len < 0) |
| 59 | goto use_yarg_oom; |
| 60 | *strp = (char *) malloc(len + 1); |
| 61 | if (!*strp) |
| 62 | goto use_yarg_oom; |
| 63 | va_start(ap, fmt); |
| 64 | len = vsnprintf(*strp, len + 1, fmt, ap); |
| 65 | va_end(ap); |
| 66 | return len; |
| 67 | |
| 68 | use_yarg_oom: |
| 69 | *strp = (char *)yarg_oom; |
| 70 | return sizeof(yarg_oom); |
| 71 | } |
| 72 | |
| 73 | static char * yarg_strdup(const char * str) { |
| 74 | char * new_str = (char *) calloc(strlen(str) + 1, 1); |
| 75 | if (!new_str) return NULL; |
| 76 | strcpy(new_str, str); |
| 77 | return new_str; |
| 78 | } |
| 79 | |
| 80 | static int yarg_parse_unix(int argc, char * argv[], yarg_options opt[], |
| 81 | yarg_result * res, bool dash_dash) { |
| 82 | int no_args = 0, no_pos_args = 0; |
| 83 | for (int i = 1; i < argc; i++) { |
| 84 | if (argv[i][0] == '-') { |
| 85 | if (argv[i][1] == '-') { |
| 86 | if (dash_dash && argv[i][2] == '\0') |
| 87 | { no_pos_args += argc - i - 1; break; } |
| 88 | char * long_opt = argv[i] + 2; yarg_options * o = NULL; |
| 89 | int len = 0; while (long_opt[len] && long_opt[len] != '=') len++; |
| 90 | for (int j = 0; opt[j].opt; j++) |
| 91 | if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len)) |
| 92 | { o = &opt[j]; break; } |
| 93 | if (!o) { |
| 94 | yarg_asprintf(&res->error, "--%.*s -- unknown option\n", len, long_opt); |
| 95 | return 0; |
| 96 | } |
| 97 | if (o->type == required_argument) { |
| 98 | if (long_opt[len] == '=') { |
| 99 | // Ignore. |
| 100 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 101 | i++; |
| 102 | } else { |
| 103 | yarg_asprintf(&res->error, "--%s -- missing argument\n", o->long_opt); |
| 104 | return 0; |
| 105 | } |
| 106 | } else if (o->type == optional_argument) { |
| 107 | if (long_opt[len] == '=') { |
| 108 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 109 | i++; |
| 110 | } |
| 111 | } |
| 112 | no_args++; |
| 113 | } else { |
| 114 | for (int j = 1; argv[i][j]; j++) { |
| 115 | char c = argv[i][j]; yarg_options * o = NULL; |
| 116 | for (int k = 0; opt[k].opt; k++) |
| 117 | if (opt[k].opt == c) |
| 118 | { o = &opt[k]; break; } |
| 119 | if (!o) { |
| 120 | yarg_asprintf(&res->error, "-%c -- unknown option\n", c); |
| 121 | return 0; |
| 122 | } |
| 123 | if (o->type == required_argument) { |
| 124 | if (argv[i][j + 1]) { |
| 125 | // Ignore. |
| 126 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 127 | i++; |
| 128 | } else { |
| 129 | yarg_asprintf(&res->error, "-%c -- missing argument\n", c); |
| 130 | return 0; |
| 131 | } |
| 132 | no_args++; |
| 133 | break; |
| 134 | } else if(o->type == optional_argument) { |
| 135 | if (argv[i][j + 1]) { |
| 136 | // Ignore. |
| 137 | no_args++; |
| 138 | break; |
| 139 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 140 | i++; |
| 141 | no_args++; |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | no_args++; |
| 146 | } |
| 147 | } |
| 148 | } else no_pos_args++; |
| 149 | } |
| 150 | |
| 151 | res->args = (yarg_option *) calloc((no_args + 1) * sizeof(yarg_option), 1); |
| 152 | res->pos_args = (char **) calloc((no_pos_args + 1) * sizeof(char *), 1); |
| 153 | if(!res->args || !res->pos_args) { |
| 154 | yarg_asprintf(&res->error, yarg_oom); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | for (int i = 1; i < argc; i++) { |
| 159 | if (argv[i][0] == '-') { |
| 160 | if (argv[i][1] == '-') { |
| 161 | if (dash_dash && argv[i][2] == '\0') { |
| 162 | for (int j = i + 1; j < argc; j++) |
| 163 | if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[j]))) { |
| 164 | yarg_asprintf(&res->error, yarg_oom); |
| 165 | return 0; |
| 166 | } |
| 167 | break; |
| 168 | } |
| 169 | char * long_opt = argv[i] + 2; yarg_options * o = NULL; |
| 170 | int len = 0; while (long_opt[len] && long_opt[len] != '=') len++; |
| 171 | for (int j = 0; opt[j].opt; j++) |
| 172 | if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len)) |
| 173 | { o = &opt[j]; break; } |
| 174 | res->args[res->argc].opt = o->opt; |
| 175 | res->args[res->argc].long_opt = o->long_opt; |
| 176 | if (o->type == required_argument || o->type == optional_argument) { |
| 177 | if (long_opt[len] == '=') { |
| 178 | if(!(res->args[res->argc].arg = yarg_strdup(long_opt + len + 1))) { |
| 179 | yarg_asprintf(&res->error, yarg_oom); |
| 180 | return 0; |
| 181 | } |
| 182 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 183 | if(!(res->args[res->argc].arg = yarg_strdup(argv[++i]))) { |
| 184 | yarg_asprintf(&res->error, yarg_oom); |
| 185 | return 0; |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | res->argc++; |
| 190 | } else { |
| 191 | for (int j = 1; argv[i][j]; j++) { |
| 192 | char c = argv[i][j]; yarg_options * o = NULL; |
| 193 | for (int k = 0; opt[k].opt; k++) |
| 194 | if (opt[k].opt == c) |
| 195 | { o = &opt[k]; break; } |
| 196 | if (!o) { |
| 197 | yarg_asprintf(&res->error, "-%c -- unknown option\n", c); |
| 198 | return 0; |
| 199 | } |
| 200 | res->args[res->argc].opt = c; |
| 201 | res->args[res->argc].long_opt = o->long_opt; |
| 202 | if (o->type == required_argument || o->type == optional_argument) { |
| 203 | if (argv[i][j + 1]) { |
| 204 | if(!(res->args[res->argc++].arg = yarg_strdup(argv[i] + j + 1))) { |
| 205 | yarg_asprintf(&res->error, yarg_oom); |
| 206 | return 0; |
| 207 | } |
| 208 | break; |
| 209 | } else if (argv[i + 1] && argv[i + 1][0] != '-') { |
| 210 | if(!(res->args[res->argc++].arg = yarg_strdup(argv[++i]))) { |
| 211 | yarg_asprintf(&res->error, yarg_oom); |
| 212 | return 0; |
| 213 | } |
| 214 | break; |
| 215 | } |
| 216 | } |
| 217 | res->argc++; |
| 218 | } |
| 219 | } |
| 220 | } else if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[i]))) { |
| 221 | yarg_asprintf(&res->error, yarg_oom); |
| 222 | return 0; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | return 1; |
| 227 | } |
| 228 | |
| 229 | static int yarg_parse_unix_short(int argc, char * argv[], yarg_options opt[], |
| 230 | yarg_result * res, bool dash_dash, char opt_char) { |
| 231 | int no_args = 0, no_pos_args = 0; |
| 232 | for (int i = 1; i < argc; i++) { |
| 233 | if (argv[i][0] == opt_char) { |
| 234 | if (dash_dash && argv[i][1] == '\0') { |
| 235 | no_pos_args += argc - i - 1; |
| 236 | break; |
| 237 | } |
| 238 | char * long_opt = argv[i] + 1; yarg_options * o = NULL; |
| 239 | int len = 0; while (long_opt[len] && long_opt[len] != '=') len++; |
| 240 | for (int j = 0; opt[j].opt; j++) |
| 241 | if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len)) |
| 242 | { o = &opt[j]; break; } |
| 243 | if (!o) { |
| 244 | yarg_asprintf(&res->error, "%c%.*s -- unknown option\n", opt_char, len, long_opt); |
| 245 | return 0; |
| 246 | } |
| 247 | if (o->type == required_argument) { |
| 248 | if (long_opt[len] == '=') { |
| 249 | // Ignore. |
| 250 | } else if (argv[i + 1] && argv[i + 1][0] != opt_char) { |
| 251 | i++; |
| 252 | } else { |
| 253 | yarg_asprintf(&res->error, "%c%s -- missing argument\n", opt_char, o->long_opt); |
| 254 | return 0; |
| 255 | } |
| 256 | } else if (o->type == optional_argument) { |
| 257 | if (long_opt[len] == '=') { |
| 258 | // Ignore. |
| 259 | } else if (argv[i + 1] && argv[i + 1][0] != opt_char) { |
| 260 | i++; |
| 261 | } |
| 262 | } |
| 263 | no_args++; |
| 264 | } else no_pos_args++; |
| 265 | } |
| 266 | |
| 267 | res->args = (yarg_option *) calloc((no_args + 1) * sizeof(yarg_option), 1); |
| 268 | res->pos_args = (char **) calloc((no_pos_args + 1) * sizeof(char *), 1); |
| 269 | if (!res->args || !res->pos_args) { |
| 270 | yarg_asprintf(&res->error, yarg_oom); |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | for (int i = 1; i < argc; i++) { |
| 275 | if (argv[i][0] == opt_char) { |
| 276 | if (dash_dash && argv[i][1] == '\0') { |
| 277 | for (int j = i + 1; j < argc; j++) |
| 278 | if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[j]))) { |
| 279 | yarg_asprintf(&res->error, yarg_oom); |
| 280 | return 0; |
| 281 | } |
| 282 | break; |
| 283 | } |
| 284 | char * long_opt = argv[i] + 1; yarg_options * o = NULL; |
| 285 | int len = 0; while (long_opt[len] && long_opt[len] != '=') len++; |
| 286 | for (int j = 0; opt[j].opt; j++) |
| 287 | if (opt[j].long_opt && !strncmp(opt[j].long_opt, long_opt, len)) |
| 288 | { o = &opt[j]; break; } |
| 289 | res->args[res->argc].opt = o->opt; |
| 290 | res->args[res->argc].long_opt = o->long_opt; |
| 291 | if (o->type == required_argument || o->type == optional_argument) { |
| 292 | if (long_opt[len] == '=') { |
| 293 | if(!(res->args[res->argc].arg = yarg_strdup(long_opt + len + 1))) { |
| 294 | yarg_asprintf(&res->error, yarg_oom); |
| 295 | return 0; |
| 296 | } |
| 297 | } else if (argv[i + 1] && argv[i + 1][0] != opt_char) { |
| 298 | if(!(res->args[res->argc].arg = yarg_strdup(argv[++i]))) { |
| 299 | yarg_asprintf(&res->error, yarg_oom); |
| 300 | return 0; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | res->argc++; |
| 305 | } else if(!(res->pos_args[res->pos_argc++] = yarg_strdup(argv[i]))) { |
| 306 | yarg_asprintf(&res->error, yarg_oom); |
| 307 | return 0; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | return 1; |
| 312 | } |
| 313 | |
| 314 | void yarg_destroy(yarg_result * r) { |
| 315 | if(r) { |
| 316 | if(r->args) { |
| 317 | for (int i = 0; i < r->argc; i++) { |
| 318 | free(r->args[i].arg); |
| 319 | } |
| 320 | } |
| 321 | free(r->args); |
| 322 | if(r->pos_args) { |
| 323 | for (int i = 0; i < r->pos_argc; i++) { |
| 324 | free(r->pos_args[i]); |
| 325 | } |
| 326 | } |
| 327 | free(r->pos_args); |
| 328 | if (r->error != yarg_oom) |
| 329 | free(r->error); |
| 330 | } |
| 331 | free(r); |
| 332 | } |
| 333 | |
| 334 | yarg_result * yarg_parse(int argc, char * argv[], yarg_options opt[], yarg_settings settings) { |
| 335 | yarg_result * res = (yarg_result *) calloc(sizeof(yarg_result), 1); |
| 336 | if (!res) return NULL; |
| 337 | switch (settings.style) { |
| 338 | case YARG_STYLE_WINDOWS: |
| 339 | yarg_parse_unix_short(argc, argv, opt, res, false, '/'); |
| 340 | break; |
| 341 | case YARG_STYLE_UNIX: |
| 342 | yarg_parse_unix(argc, argv, opt, res, settings.dash_dash); |
| 343 | break; |
| 344 | case YARG_STYLE_UNIX_SHORT: |
| 345 | yarg_parse_unix_short(argc, argv, opt, res, settings.dash_dash, '-'); |
| 346 | break; |
| 347 | } |
| 348 | return res; |
| 349 | } |
| 350 | |
| 351 | #endif |
