liboptcfg

annotate src/optcfg.c @ 4:a6f127f3408d

find changesets by author, revision, files, or words in the commit message
implemented -no- and -disable- prefixes
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 27 Jul 2016 05:05:45 +0300
parents 9c73004c7af3
children aca7267dfee0
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <stdlib.h>
nuclear@0 3 #include <string.h>
nuclear@0 4 #include <ctype.h>
nuclear@0 5 #ifdef _MSC_VER
nuclear@0 6 #include <malloc.h>
nuclear@0 7 #else
nuclear@0 8 #include <alloca.h>
nuclear@0 9 #endif
nuclear@0 10 #include "optcfg.h"
nuclear@0 11
nuclear@0 12 struct optcfg {
nuclear@0 13 struct optcfg_option *optlist;
nuclear@0 14
nuclear@0 15 optcfg_opt_callback opt_func;
nuclear@0 16 void *opt_cls;
nuclear@0 17 optcfg_arg_callback arg_func;
nuclear@0 18 void *arg_cls;
nuclear@0 19
nuclear@0 20 int err_abort;
nuclear@0 21
nuclear@0 22 /* argument parsing state */
nuclear@0 23 char **argv;
nuclear@0 24 int argidx;
nuclear@4 25 int disable_opt;
nuclear@0 26
nuclear@0 27 /* config file parsing state */
nuclear@0 28 const char *cfg_fname;
nuclear@0 29 int cfg_nline;
nuclear@0 30 char *cfg_value;
nuclear@0 31 };
nuclear@0 32
nuclear@4 33 static int get_opt(struct optcfg *oc, const char *s, int *disable_opt);
nuclear@0 34 static char *skip_spaces(char *s);
nuclear@0 35 static void strip_comments(char *s);
nuclear@0 36 static void strip_trailing_spaces(char *s);
nuclear@0 37 static char *parse_keyval(char *line);
nuclear@0 38
nuclear@0 39
nuclear@0 40 struct optcfg *optcfg_init(struct optcfg_option *optv)
nuclear@0 41 {
nuclear@0 42 struct optcfg *oc;
nuclear@0 43
nuclear@0 44 if(!(oc = calloc(1, sizeof *oc))) {
nuclear@0 45 return 0;
nuclear@0 46 }
nuclear@0 47 oc->optlist = optv;
nuclear@0 48 oc->err_abort = 1;
nuclear@0 49 return oc;
nuclear@0 50 }
nuclear@0 51
nuclear@0 52 void optcfg_destroy(struct optcfg *oc)
nuclear@0 53 {
nuclear@0 54 memset(oc, 0, sizeof *oc);
nuclear@0 55 free(oc);
nuclear@0 56 }
nuclear@0 57
nuclear@0 58 void optcfg_set_opt_callback(struct optcfg *oc, optcfg_opt_callback func, void *cls)
nuclear@0 59 {
nuclear@0 60 oc->opt_func = func;
nuclear@0 61 oc->opt_cls = cls;
nuclear@0 62 }
nuclear@0 63
nuclear@0 64 void optcfg_set_arg_callback(struct optcfg *oc, optcfg_arg_callback func, void *cls)
nuclear@0 65 {
nuclear@0 66 oc->arg_func = func;
nuclear@0 67 oc->arg_cls = cls;
nuclear@0 68 }
nuclear@0 69
nuclear@0 70 void optcfg_set_error_action(struct optcfg *oc, int act)
nuclear@0 71 {
nuclear@0 72 if(act == OPTCFG_ERROR_FAIL) {
nuclear@0 73 oc->err_abort = 1;
nuclear@0 74 } else if(act == OPTCFG_ERROR_IGNORE) {
nuclear@0 75 oc->err_abort = 0;
nuclear@0 76 }
nuclear@0 77 }
nuclear@0 78
nuclear@0 79 int optcfg_parse_args(struct optcfg *oc, int argc, char **argv)
nuclear@0 80 {
nuclear@0 81 int i;
nuclear@0 82
nuclear@0 83 oc->argv = argv;
nuclear@0 84
nuclear@0 85 for(i=1; i<argc; i++) {
nuclear@0 86 oc->argidx = i;
nuclear@0 87
nuclear@0 88 if(argv[i][0] == '-') {
nuclear@0 89 if(oc->opt_func) {
nuclear@4 90 int o = get_opt(oc, argv[i], &oc->disable_opt);
nuclear@0 91 if(o == -1 || oc->opt_func(oc, o, oc->opt_cls) == -1) {
nuclear@0 92 if(oc->err_abort) {
nuclear@4 93 fprintf(stderr, "unexpected option: %s\n", argv[i]);
nuclear@0 94 return -1;
nuclear@0 95 }
nuclear@0 96 }
nuclear@0 97 } else {
nuclear@0 98 fprintf(stderr, "unexpected option: %s\n", argv[i]);
nuclear@0 99 if(oc->err_abort) {
nuclear@0 100 return -1;
nuclear@0 101 }
nuclear@0 102 }
nuclear@0 103 } else {
nuclear@0 104 if(oc->arg_func) {
nuclear@0 105 if(oc->arg_func(oc, argv[i], oc->arg_cls) == -1) {
nuclear@0 106 if(oc->err_abort) {
nuclear@4 107 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@0 108 return -1;
nuclear@0 109 }
nuclear@0 110 }
nuclear@0 111 } else {
nuclear@0 112 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@0 113 if(oc->err_abort) {
nuclear@0 114 return -1;
nuclear@0 115 }
nuclear@0 116 }
nuclear@0 117 }
nuclear@0 118
nuclear@0 119 i = oc->argidx;
nuclear@0 120 }
nuclear@0 121
nuclear@0 122 oc->argidx = 0; /* done parsing args */
nuclear@0 123 return 0;
nuclear@0 124 }
nuclear@0 125
nuclear@0 126 int optcfg_parse_config_file(struct optcfg *oc, const char *fname)
nuclear@0 127 {
nuclear@0 128 int res;
nuclear@0 129 FILE *fp = fopen(fname, "rb");
nuclear@0 130 if(!fp) {
nuclear@0 131 return -1;
nuclear@0 132 }
nuclear@0 133
nuclear@0 134 oc->cfg_fname = fname;
nuclear@0 135 res = optcfg_parse_config_stream(oc, fp);
nuclear@0 136 oc->cfg_fname = 0;
nuclear@0 137 fclose(fp);
nuclear@0 138 return res;
nuclear@0 139 }
nuclear@0 140
nuclear@0 141 int optcfg_parse_config_stream(struct optcfg *oc, FILE *fp)
nuclear@0 142 {
nuclear@0 143 char buf[512];
nuclear@0 144
nuclear@0 145 oc->cfg_nline = 0;
nuclear@0 146 while(fgets(buf, sizeof buf, fp)) {
nuclear@0 147 ++oc->cfg_nline;
nuclear@0 148
nuclear@0 149 if(optcfg_parse_config_line(oc, buf) == -1) {
nuclear@0 150 if(oc->err_abort) {
nuclear@0 151 return -1;
nuclear@0 152 }
nuclear@0 153 }
nuclear@0 154 }
nuclear@0 155 return 0;
nuclear@0 156 }
nuclear@0 157
nuclear@0 158 int optcfg_parse_config_line(struct optcfg *oc, const char *line)
nuclear@0 159 {
nuclear@0 160 int opt, len;
nuclear@0 161 char *start, *val, *buf;
nuclear@0 162
nuclear@0 163 len = strlen(line);
nuclear@0 164 buf = alloca(len + 1);
nuclear@2 165 memcpy(buf, line, len + 1);
nuclear@0 166
nuclear@0 167 start = skip_spaces(buf);
nuclear@0 168 strip_comments(start);
nuclear@0 169 strip_trailing_spaces(start);
nuclear@0 170 if(!*start) {
nuclear@0 171 return 0;
nuclear@0 172 }
nuclear@0 173
nuclear@0 174 if(!(val = parse_keyval(start))) {
nuclear@0 175 fprintf(stderr, "error parsing %s line %d: invalid syntax\n", oc->cfg_fname ? oc->cfg_fname : "", oc->cfg_nline);
nuclear@0 176 return -1;
nuclear@0 177 }
nuclear@0 178 oc->cfg_value = val;
nuclear@4 179 if((opt = get_opt(oc, start, 0)) == -1) {
nuclear@0 180 fprintf(stderr, "error parsing %s line %d: unknown option: %s\n", oc->cfg_fname ? oc->cfg_fname : "",
nuclear@0 181 oc->cfg_nline, start);
nuclear@0 182 return -1;
nuclear@0 183 }
nuclear@0 184
nuclear@0 185 if(oc->opt_func) {
nuclear@0 186 if(oc->opt_func(oc, opt, oc->opt_cls) == -1) {
nuclear@0 187 return -1;
nuclear@0 188 }
nuclear@0 189 }
nuclear@0 190 oc->cfg_value = 0;
nuclear@0 191 return 0;
nuclear@0 192 }
nuclear@0 193
nuclear@2 194 int optcfg_enabled_value(struct optcfg *oc, int *enabledp)
nuclear@2 195 {
nuclear@2 196 if(oc->argidx) {
nuclear@4 197 *enabledp = ~oc->disable_opt & 1;
nuclear@2 198 } else {
nuclear@2 199 char *val = optcfg_next_value(oc);
nuclear@2 200 if(optcfg_bool_value(val, enabledp) == -1) {
nuclear@2 201 return -1;
nuclear@2 202 }
nuclear@2 203 }
nuclear@2 204 return 0;
nuclear@2 205 }
nuclear@2 206
nuclear@2 207
nuclear@0 208 char *optcfg_next_value(struct optcfg *oc)
nuclear@0 209 {
nuclear@0 210 if(oc->argidx) { /* we're in the middle of parsing arguments, so get the next one */
nuclear@0 211 return oc->argv[++oc->argidx];
nuclear@0 212 }
nuclear@0 213 if(oc->cfg_value) {
nuclear@0 214 char *val = oc->cfg_value;
nuclear@0 215 oc->cfg_value = 0;
nuclear@0 216 return val;
nuclear@0 217 }
nuclear@0 218 return 0;
nuclear@0 219 }
nuclear@0 220
nuclear@0 221 void optcfg_print_options(struct optcfg *oc)
nuclear@0 222 {
nuclear@0 223 int i;
nuclear@0 224 for(i=0; oc->optlist[i].opt != -1; i++) {
nuclear@0 225 struct optcfg_option *opt = oc->optlist + i;
nuclear@0 226
nuclear@0 227 if(opt->c) {
nuclear@0 228 printf(" -%c", opt->c);
nuclear@0 229 } else {
nuclear@0 230 printf(" ");
nuclear@0 231 }
nuclear@0 232 if(opt->s) {
nuclear@0 233 printf("%c-%s: ", opt->c ? ',' : ' ', opt->s);
nuclear@0 234 } else {
nuclear@0 235 printf(": ");
nuclear@0 236 }
nuclear@0 237 printf("%s\n", opt->desc ? opt->desc : "undocumented");
nuclear@0 238 }
nuclear@0 239 }
nuclear@0 240
nuclear@0 241 int optcfg_bool_value(char *s, int *valret)
nuclear@0 242 {
nuclear@0 243 if(strcasecmp(s, "yes") == 0 || strcasecmp(s, "true") == 0 || strcmp(s, "1") == 0) {
nuclear@0 244 *valret = 1;
nuclear@0 245 return 0;
nuclear@0 246 }
nuclear@0 247 if(strcasecmp(s, "no") == 0 || strcasecmp(s, "false") == 0 || strcmp(s, "0") == 0) {
nuclear@0 248 *valret = 0;
nuclear@0 249 return 0;
nuclear@0 250 }
nuclear@0 251 return -1;
nuclear@0 252 }
nuclear@0 253
nuclear@0 254 int optcfg_int_value(char *str, int *valret)
nuclear@0 255 {
nuclear@0 256 char *endp;
nuclear@0 257 *valret = strtol(str, &endp, 0);
nuclear@0 258 if(endp == str) {
nuclear@0 259 return -1;
nuclear@0 260 }
nuclear@0 261 return 0;
nuclear@0 262 }
nuclear@0 263
nuclear@0 264 int optcfg_float_value(char *str, float *valret)
nuclear@0 265 {
nuclear@0 266 char *endp;
nuclear@0 267 *valret = strtod(str, &endp);
nuclear@0 268 if(endp == str) {
nuclear@0 269 return -1;
nuclear@0 270 }
nuclear@0 271 return 0;
nuclear@0 272 }
nuclear@0 273
nuclear@0 274
nuclear@0 275
nuclear@4 276 static int get_opt(struct optcfg *oc, const char *arg, int *disable_opt)
nuclear@0 277 {
nuclear@1 278 int i, ndashes = 0;
nuclear@0 279
nuclear@1 280 while(*arg && *arg == '-') {
nuclear@4 281 ++ndashes;
nuclear@4 282 ++arg;
nuclear@0 283 }
nuclear@0 284
nuclear@1 285 if(ndashes > 2) {
nuclear@1 286 arg -= ndashes;
nuclear@4 287 ndashes = 0;
nuclear@4 288 }
nuclear@4 289
nuclear@4 290 if(disable_opt) {
nuclear@4 291 if(ndashes && (strstr(arg, "no-") == arg || strstr(arg, "disable-") == arg)) {
nuclear@4 292 *disable_opt = 1;
nuclear@4 293 arg = strchr(arg, '-') + 1; /* guaranteed to exist at this point */
nuclear@4 294 } else {
nuclear@4 295 *disable_opt = 0;
nuclear@4 296 }
nuclear@1 297 }
nuclear@1 298
nuclear@1 299 if(arg[1]) { /* match long options */
nuclear@0 300 for(i=0; oc->optlist[i].opt != -1; i++) {
nuclear@1 301 if(strcmp(arg, oc->optlist[i].s) == 0) {
nuclear@0 302 return i;
nuclear@0 303 }
nuclear@0 304 }
nuclear@0 305 } else {
nuclear@0 306 for(i=0; oc->optlist[i].opt != -1; i++) {
nuclear@1 307 if(arg[0] == oc->optlist[i].c) {
nuclear@0 308 return i;
nuclear@0 309 }
nuclear@0 310 }
nuclear@0 311 }
nuclear@0 312 return -1;
nuclear@0 313 }
nuclear@0 314
nuclear@0 315 static char *skip_spaces(char *s)
nuclear@0 316 {
nuclear@0 317 while(*s && isspace(*s)) ++s;
nuclear@0 318 return s;
nuclear@0 319 }
nuclear@0 320
nuclear@0 321 static void strip_comments(char *s)
nuclear@0 322 {
nuclear@0 323 while(*s && *s != '#') ++s;
nuclear@0 324 if(*s == '#') *s = 0;
nuclear@0 325 }
nuclear@0 326
nuclear@0 327 static void strip_trailing_spaces(char *s)
nuclear@0 328 {
nuclear@0 329 char *end = s + strlen(s) - 1;
nuclear@0 330 while(end >= s && isspace(*end)) {
nuclear@0 331 *end-- = 0;
nuclear@0 332 }
nuclear@0 333 }
nuclear@0 334
nuclear@0 335 static char *parse_keyval(char *line)
nuclear@0 336 {
nuclear@0 337 char *val;
nuclear@0 338 char *eq = strchr(line, '=');
nuclear@0 339 if(!eq) return 0;
nuclear@0 340
nuclear@0 341 *eq = 0;
nuclear@0 342 strip_trailing_spaces(line);
nuclear@0 343 val = skip_spaces(eq + 1);
nuclear@2 344 strip_trailing_spaces(val);
nuclear@0 345
nuclear@0 346 if(!*line || !*val) {
nuclear@0 347 return 0;
nuclear@0 348 }
nuclear@0 349 return val;
nuclear@0 350 }