2 * UCW Library -- Parsing of command-line options
4 * (c) 2013 Jan Moskyto Matejka <mq@ucw.cz>
5 * (c) 2014 Martin Mares <mj@ucw.cz>
7 * This software may be freely distributed and used according to the terms
8 * of the GNU Lesser General Public License.
13 #include <ucw/opt-internal.h>
14 #include <ucw/stkstring.h>
15 #include <ucw/strtonum.h>
21 * Value flags defaults
22 * ~~~~~~~~~~~~~~~~~~~~
24 * OPT_NO_VALUE for OPT_BOOL, OPT_SWITCH and OPT_INC
25 * OPT_MAYBE_VALUE for OPT_STRING, OPT_UNS, OPT_INT
26 * Some of the value flags (OPT_NO_VALUE, OPT_MAYBE_VALUE, OPT_REQUIRED_VALUE)
27 * must be specified for OPT_CALL and OPT_USER.
29 static uns opt_default_value_flags[] = {
30 [OPT_CL_BOOL] = OPT_NO_VALUE,
31 [OPT_CL_STATIC] = OPT_MAYBE_VALUE,
32 [OPT_CL_SWITCH] = OPT_NO_VALUE,
33 [OPT_CL_INC] = OPT_NO_VALUE,
41 struct opt_precomputed * opts;
42 struct opt_precomputed ** shortopt;
43 struct opt_item ** hooks_before_arg;
44 struct opt_item ** hooks_before_value;
45 struct opt_item ** hooks_after_value;
47 short hooks_before_arg_count;
48 short hooks_before_value_count;
49 short hooks_after_value_count;
54 void opt_failure(const char * mesg, ...) {
57 vfprintf(stderr, mesg, args);
58 fprintf(stderr, "\n");
60 exit(OPT_EXIT_BAD_ARGS);
63 static char *opt_name(struct opt_context *oc, struct opt_precomputed *opt)
65 struct opt_item *item = opt->item;
67 if (item->letter >= OPT_POSITIONAL_TAIL)
68 res = stk_printf("positional argument #%d", oc->positional_count);
69 else if (opt->flags & OPT_SEEN_AS_LONG)
70 res = stk_printf("--%s", opt->name);
72 res = stk_printf("-%c", item->letter);
76 #define THIS_OPT opt_name(oc, opt)
78 void opt_precompute(struct opt_precomputed *opt, struct opt_item *item)
82 opt->name = item->name;
83 uns flags = item->flags;
85 if (item->letter >= OPT_POSITIONAL_TAIL) {
86 flags &= ~OPT_VALUE_FLAGS;
87 flags |= OPT_REQUIRED_VALUE;
89 if (!(flags & OPT_VALUE_FLAGS)) {
90 ASSERT(item->cls != OPT_CL_CALL && item->cls != OPT_CL_USER);
91 flags |= opt_default_value_flags[item->cls];
97 static struct opt_precomputed * opt_find_item_longopt(struct opt_context * oc, char * str) {
98 uns len = strlen(str);
99 struct opt_precomputed * candidate = NULL;
101 for (int i = 0; i < oc->opt_count; i++) {
102 struct opt_precomputed *opt = &oc->opts[i];
106 if (!strncmp(opt->name, str, len)) {
107 if (strlen(opt->name) == len)
109 } else if (opt->item->cls == OPT_CL_BOOL && !strncmp("no-", str, 3) && !strncmp(opt->name, str+3, len-3)) {
110 if (strlen(opt->name) == len-3)
116 opt_failure("Ambiguous option --%s: matches both --%s and --%s.", str, candidate->name, opt->name);
124 opt_failure("Invalid option --%s.", str);
127 // FIXME: Use simple-lists?
128 #define OPT_PTR(type) ({ \
130 if (item->flags & OPT_MULTIPLE) { \
134 } * n = xmalloc(sizeof(*n)); \
135 clist_add_tail(item->ptr, &(n->n)); \
141 static void opt_parse_value(struct opt_context * oc, struct opt_precomputed * opt, char * value) {
142 struct opt_item * item = opt->item;
144 if (opt->count++ && (opt->flags & OPT_SINGLE))
145 opt_failure("Option %s must be specified at most once.", THIS_OPT);
147 for (int i = 0; i < oc->hooks_before_value_count; i++)
148 oc->hooks_before_value[i]->u.call(item, value, oc->hooks_before_value[i]->ptr);
152 if (!value || !strcasecmp(value, "y") || !strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"))
153 *((int *) item->ptr) = 1 ^ (!!(opt->flags & OPT_NEGATIVE));
154 else if (!strcasecmp(value, "n") || !strcasecmp(value, "no") || !strcasecmp(value, "false") || !strcasecmp(value, "0"))
155 *((int *) item->ptr) = 0 ^ (!!(opt->flags & OPT_NEGATIVE));
157 opt_failure("Boolean argument for %s has a strange value. Supported (case insensitive): 1/0, y/n, yes/no, true/false.", THIS_OPT);
162 switch (item->type) {
167 e = cf_parse_int(value, OPT_PTR(int));
169 opt_failure("Integer value parsing failed for %s: %s", THIS_OPT, e);
175 e = cf_parse_u64(value, OPT_PTR(u64));
177 opt_failure("Unsigned 64-bit value parsing failed for %s: %s", THIS_OPT, e);
181 *OPT_PTR(double) = NAN;
183 e = cf_parse_double(value, OPT_PTR(double));
185 opt_failure("Floating-point value parsing failed for %s: %s", THIS_OPT, e);
191 e = cf_parse_ip(value, OPT_PTR(u32));
193 opt_failure("IP address parsing failed for %s: %s", THIS_OPT, e);
197 *OPT_PTR(const char *) = NULL;
199 *OPT_PTR(const char *) = xstrdup(value);
207 if ((opt->flags & OPT_SINGLE) && *((int *)item->ptr) != -1)
208 opt_failure("Multiple switches: %s", THIS_OPT);
210 *((int *)item->ptr) = item->u.value;
213 if (opt->flags & OPT_NEGATIVE)
214 (*((int *)item->ptr))--;
216 (*((int *)item->ptr))++;
219 item->u.call(item, value, item->ptr);
224 e = item->u.utype->parser(value, OPT_PTR(void*));
226 opt_failure("Cannot parse the value of %s: %s", THIS_OPT, e);
233 for (int i = 0;i < oc->hooks_after_value_count; i++)
234 oc->hooks_after_value[i]->u.call(item, value, oc->hooks_after_value[i]->ptr);
237 static int opt_longopt(struct opt_context * oc, char ** argv, int index) {
239 char * name_in = argv[index] + 2; // skipping the -- on the beginning
240 uns pos = strchrnul(name_in, '=') - name_in;
241 struct opt_precomputed * opt = opt_find_item_longopt(oc, strndupa(name_in, pos));
244 opt->flags |= OPT_SEEN_AS_LONG;
246 if (opt->item->cls == OPT_CL_BOOL && !strncmp(name_in, "no-", 3) && !strncmp(name_in+3, opt->item->name, pos-3)) {
248 opt_failure("Option --%s must not have any value.", name_in);
250 } else if (opt->flags & OPT_REQUIRED_VALUE) {
252 value = name_in + pos + 1;
254 value = argv[index+1];
256 opt_failure("Option %s must have a value, but nothing supplied.", THIS_OPT);
259 } else if (opt->flags & OPT_MAYBE_VALUE) {
261 value = name_in + pos + 1;
264 opt_failure("Option %s must have no value.", THIS_OPT);
266 opt_parse_value(oc, opt, value);
270 static int opt_shortopt(struct opt_context * oc, char ** argv, int index) {
272 struct opt_precomputed * opt;
275 while (o = argv[index][++chr]) {
276 if (o < 0 || o >= 128)
277 opt_failure("Invalid character 0x%02x in option name. Only ASCII is allowed.", o & 0xff);
278 opt = oc->shortopt[o];
281 opt_failure("Unknown option -%c.", o);
283 opt->flags &= ~OPT_SEEN_AS_LONG;
285 if (opt->flags & OPT_NO_VALUE)
286 opt_parse_value(oc, opt, NULL);
287 else if (opt->flags & OPT_REQUIRED_VALUE) {
288 if (argv[index][chr+1]) {
289 opt_parse_value(oc, opt, argv[index] + chr + 1);
291 } else if (!argv[index+1])
292 opt_failure("Option -%c must have a value, but nothing supplied.", o);
294 opt_parse_value(oc, opt, argv[index+1]);
297 } else if (opt->flags & OPT_MAYBE_VALUE) {
298 if (argv[index][chr+1]) {
299 opt_parse_value(oc, opt, argv[index] + chr + 1);
302 opt_parse_value(oc, opt, NULL);
311 static void opt_positional(struct opt_context * oc, char * value) {
312 oc->positional_count++;
313 uns id = oc->positional_count > oc->positional_max ? OPT_POSITIONAL_TAIL : OPT_POSITIONAL(oc->positional_count);
314 struct opt_precomputed * opt = oc->shortopt[id];
316 opt_failure("Too many positional arguments.");
318 opt->flags &= OPT_SEEN_AS_LONG;
319 opt_parse_value(oc, opt, value);
323 static void opt_count_items(struct opt_context *oc, const struct opt_section *sec)
325 for (const struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
326 if (item->cls == OPT_CL_SECTION)
327 opt_count_items(oc, item->u.section);
328 else if (item->cls == OPT_CL_HOOK) {
329 if (item->flags & OPT_HOOK_BEFORE_ARG)
330 oc->hooks_before_arg_count++;
331 else if (item->flags & OPT_HOOK_BEFORE_VALUE)
332 oc->hooks_before_value_count++;
333 else if (item->flags & OPT_HOOK_AFTER_VALUE)
334 oc->hooks_after_value_count++;
337 } else if (item->letter || item->name) {
339 if (item->letter > OPT_POSITIONAL_TAIL)
340 oc->positional_max++;
345 static void opt_prepare_items(struct opt_context *oc, const struct opt_section *sec)
347 for (struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
348 if (item->cls == OPT_CL_SECTION)
349 opt_prepare_items(oc, item->u.section);
350 else if (item->cls == OPT_CL_HOOK) {
351 if (item->flags & OPT_HOOK_BEFORE_ARG)
352 oc->hooks_before_arg[oc->hooks_before_arg_count++] = item;
353 else if (item->flags & OPT_HOOK_BEFORE_VALUE)
354 oc->hooks_before_value[oc->hooks_before_value_count++] = item;
355 else if (item->flags & OPT_HOOK_AFTER_VALUE)
356 oc->hooks_after_value[oc->hooks_after_value_count++] = item;
359 } else if (item->letter || item->name) {
360 struct opt_precomputed * opt = &oc->opts[oc->opt_count++];
361 opt_precompute(opt, item);
363 oc->shortopt[(int) item->letter] = opt;
368 static void opt_check_required(struct opt_context *oc)
370 for (int i = 0; i < oc->opt_count; i++) {
371 struct opt_precomputed *opt = &oc->opts[i];
372 if (!opt->count && (opt->flags & OPT_REQUIRED)) {
373 struct opt_item *item = opt->item;
374 if (item->letter > OPT_POSITIONAL_TAIL)
375 opt_failure("Required positional argument #%d not found.", item->letter - OPT_POSITIONAL_TAIL);
376 else if (item->letter == OPT_POSITIONAL_TAIL)
377 opt_failure("Required positional argument not found.");
378 else if (item->letter && item->name)
379 opt_failure("Required option -%c/--%s not found.", item->letter, item->name);
380 else if (item->letter)
381 opt_failure("Required option -%c not found.", item->letter);
383 opt_failure("Required option --%s not found.", item->name);
388 void opt_parse(const struct opt_section * options, char ** argv) {
389 struct opt_context * oc = alloca(sizeof(*oc));
390 memset(oc, 0, sizeof (*oc));
392 opt_count_items(oc, options);
393 oc->opts = alloca(sizeof(*oc->opts) * oc->opt_count);
394 oc->shortopt = alloca(sizeof(*oc->shortopt) * (oc->positional_max + 257));
395 memset(oc->shortopt, 0, sizeof(*oc->shortopt) * (oc->positional_max + 257));
396 oc->hooks_before_arg = alloca(sizeof (*oc->hooks_before_arg) * oc->hooks_before_arg_count);
397 oc->hooks_before_value = alloca(sizeof (*oc->hooks_before_value) * oc->hooks_before_value_count);
398 oc->hooks_after_value = alloca(sizeof (*oc->hooks_after_value) * oc->hooks_after_value_count);
401 oc->hooks_before_arg_count = 0;
402 oc->hooks_before_value_count = 0;
403 oc->hooks_after_value_count = 0;
404 opt_prepare_items(oc, options);
406 int force_positional = 0;
407 for (int i = 0; argv[i]; i++) {
409 for (int j = 0; j < oc->hooks_before_arg_count; j++)
410 oc->hooks_before_arg[j]->u.call(NULL, NULL, oc->hooks_before_arg[j]->ptr);
411 if (arg[0] != '-' || force_positional)
412 opt_positional(oc, arg);
418 i += opt_longopt(oc, argv, i);
420 i += opt_shortopt(oc, argv, i);
422 opt_positional(oc, arg);
426 opt_check_required(oc);