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>
22 * Value flags defaults
23 * ~~~~~~~~~~~~~~~~~~~~
25 * OPT_NO_VALUE for OPT_BOOL, OPT_SWITCH and OPT_INC
26 * OPT_MAYBE_VALUE for OPT_STRING, OPT_UNS, OPT_INT
27 * Some of the value flags (OPT_NO_VALUE, OPT_MAYBE_VALUE, OPT_REQUIRED_VALUE)
28 * must be specified for OPT_CALL and OPT_USER.
30 static uns opt_default_value_flags[] = {
31 [OPT_CL_BOOL] = OPT_NO_VALUE,
32 [OPT_CL_STATIC] = OPT_MAYBE_VALUE,
33 [OPT_CL_SWITCH] = OPT_NO_VALUE,
34 [OPT_CL_INC] = OPT_NO_VALUE,
42 struct opt_precomputed * opts;
43 struct opt_precomputed ** shortopt;
44 struct opt_item ** hooks;
52 void opt_failure(const char * mesg, ...) {
55 vfprintf(stderr, mesg, args);
56 fprintf(stderr, "\nRun with --help for more information.\n");
57 exit(OPT_EXIT_BAD_ARGS);
60 static char *opt_name(struct opt_context *oc, struct opt_precomputed *opt)
62 struct opt_item *item = opt->item;
64 if (item->letter >= OPT_POSITIONAL_TAIL)
65 res = stk_printf("positional argument #%d", oc->positional_count);
66 else if (opt->flags & OPT_SEEN_AS_LONG)
67 res = stk_printf("--%s", opt->name);
69 res = stk_printf("-%c", item->letter);
73 #define THIS_OPT opt_name(oc, opt)
75 void opt_precompute(struct opt_precomputed *opt, struct opt_item *item)
79 opt->name = item->name;
80 uns flags = item->flags;
82 if (item->letter >= OPT_POSITIONAL_TAIL) {
83 flags &= ~OPT_VALUE_FLAGS;
84 flags |= OPT_REQUIRED_VALUE;
86 if (!(flags & OPT_VALUE_FLAGS)) {
87 ASSERT(item->cls != OPT_CL_CALL && item->cls != OPT_CL_USER);
88 flags |= opt_default_value_flags[item->cls];
94 static void opt_invoke_hooks(struct opt_context *oc, uns event, struct opt_item *item, char *value)
96 for (int i = 0; i < oc->hook_count; i++) {
97 struct opt_item *hook = oc->hooks[i];
98 if (hook->flags & event)
99 hook->u.hook(item, event, value, hook->ptr);
103 static struct opt_precomputed * opt_find_item_longopt(struct opt_context * oc, char * str) {
104 uns len = strlen(str);
105 struct opt_precomputed * candidate = NULL;
107 for (int i = 0; i < oc->opt_count; i++) {
108 struct opt_precomputed *opt = &oc->opts[i];
112 if (!strncmp(opt->name, str, len)) {
113 if (strlen(opt->name) == len)
115 } else if (opt->item->cls == OPT_CL_BOOL && !strncmp("no-", str, 3) && !strncmp(opt->name, str+3, len-3)) {
116 if (strlen(opt->name) == len-3)
122 opt_failure("Ambiguous option --%s: matches both --%s and --%s.", str, candidate->name, opt->name);
130 opt_failure("Invalid option --%s.", str);
133 // FIXME: Use simple-lists?
134 #define OPT_PTR(type) ({ \
136 if (item->flags & OPT_MULTIPLE) { \
140 } * n = xmalloc(sizeof(*n)); \
141 clist_add_tail(item->ptr, &(n->n)); \
147 static void opt_parse_value(struct opt_context * oc, struct opt_precomputed * opt, char * value) {
148 struct opt_item * item = opt->item;
150 if (opt->count++ && (opt->flags & OPT_SINGLE))
151 opt_failure("Option %s must be specified at most once.", THIS_OPT);
153 if (opt->flags & OPT_LAST_ARG)
154 oc->stop_parsing = 1;
156 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_VALUE, item, value);
160 if (!value || !strcasecmp(value, "y") || !strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"))
161 *((int *) item->ptr) = 1 ^ (!!(opt->flags & OPT_NEGATIVE));
162 else if (!strcasecmp(value, "n") || !strcasecmp(value, "no") || !strcasecmp(value, "false") || !strcasecmp(value, "0"))
163 *((int *) item->ptr) = 0 ^ (!!(opt->flags & OPT_NEGATIVE));
165 opt_failure("Boolean argument for %s has a strange value. Supported (case insensitive): 1/0, y/n, yes/no, true/false.", THIS_OPT);
170 switch (item->type) {
175 e = cf_parse_int(value, OPT_PTR(int));
177 opt_failure("Integer value parsing failed for %s: %s", THIS_OPT, e);
183 e = cf_parse_u64(value, OPT_PTR(u64));
185 opt_failure("Unsigned 64-bit value parsing failed for %s: %s", THIS_OPT, e);
189 *OPT_PTR(double) = NAN;
191 e = cf_parse_double(value, OPT_PTR(double));
193 opt_failure("Floating-point value parsing failed for %s: %s", THIS_OPT, e);
199 e = cf_parse_ip(value, OPT_PTR(u32));
201 opt_failure("IP address parsing failed for %s: %s", THIS_OPT, e);
205 *OPT_PTR(const char *) = NULL;
207 *OPT_PTR(const char *) = xstrdup(value);
215 if ((opt->flags & OPT_SINGLE) && *((int *)item->ptr) != -1)
216 opt_failure("Multiple switches: %s", THIS_OPT);
218 *((int *)item->ptr) = item->u.value;
221 if (opt->flags & OPT_NEGATIVE)
222 (*((int *)item->ptr))--;
224 (*((int *)item->ptr))++;
227 item->u.call(item, value, item->ptr);
232 e = item->u.utype->parser(value, OPT_PTR(void*));
234 opt_failure("Cannot parse the value of %s: %s", THIS_OPT, e);
241 opt_invoke_hooks(oc, OPT_HOOK_AFTER_VALUE, item, value);
244 static int opt_longopt(struct opt_context * oc, char ** argv, int index) {
246 char * name_in = argv[index] + 2; // skipping the -- on the beginning
247 uns pos = strchrnul(name_in, '=') - name_in;
248 struct opt_precomputed * opt = opt_find_item_longopt(oc, strndupa(name_in, pos));
251 opt->flags |= OPT_SEEN_AS_LONG;
253 if (opt->item->cls == OPT_CL_BOOL && !strncmp(name_in, "no-", 3) && !strncmp(name_in+3, opt->item->name, pos-3)) {
255 opt_failure("Option --%s must not have any value.", name_in);
257 } else if (opt->flags & OPT_REQUIRED_VALUE) {
259 value = name_in + pos + 1;
261 value = argv[index+1];
263 opt_failure("Option %s must have a value, but nothing supplied.", THIS_OPT);
266 } else if (opt->flags & OPT_MAYBE_VALUE) {
268 value = name_in + pos + 1;
271 opt_failure("Option %s must have no value.", THIS_OPT);
273 opt_parse_value(oc, opt, value);
277 static int opt_shortopt(struct opt_context * oc, char ** argv, int index) {
279 struct opt_precomputed * opt;
282 while (o = argv[index][++chr]) {
283 if (o < 0 || o >= 128)
284 opt_failure("Invalid character 0x%02x in option name. Only ASCII is allowed.", o & 0xff);
285 opt = oc->shortopt[o];
288 opt_failure("Unknown option -%c.", o);
290 opt->flags &= ~OPT_SEEN_AS_LONG;
292 if (opt->flags & OPT_NO_VALUE)
293 opt_parse_value(oc, opt, NULL);
294 else if (opt->flags & OPT_REQUIRED_VALUE) {
295 if (argv[index][chr+1]) {
296 opt_parse_value(oc, opt, argv[index] + chr + 1);
298 } else if (!argv[index+1])
299 opt_failure("Option -%c must have a value, but nothing supplied.", o);
301 opt_parse_value(oc, opt, argv[index+1]);
304 } else if (opt->flags & OPT_MAYBE_VALUE) {
305 if (argv[index][chr+1]) {
306 opt_parse_value(oc, opt, argv[index] + chr + 1);
309 opt_parse_value(oc, opt, NULL);
318 static void opt_positional(struct opt_context * oc, char * value) {
319 oc->positional_count++;
320 uns id = oc->positional_count > oc->positional_max ? OPT_POSITIONAL_TAIL : OPT_POSITIONAL(oc->positional_count);
321 struct opt_precomputed * opt = oc->shortopt[id];
323 opt_failure("Too many positional arguments.");
325 opt->flags &= OPT_SEEN_AS_LONG;
326 opt_parse_value(oc, opt, value);
330 static void opt_count_items(struct opt_context *oc, const struct opt_section *sec)
332 for (const struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
333 if (item->cls == OPT_CL_SECTION)
334 opt_count_items(oc, item->u.section);
335 else if (item->cls == OPT_CL_HOOK)
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 oc->hooks[oc->hook_count++] = item;
352 else if (item->letter || item->name) {
353 struct opt_precomputed * opt = &oc->opts[oc->opt_count++];
354 opt_precompute(opt, item);
356 oc->shortopt[(int) item->letter] = opt;
361 static void opt_check_required(struct opt_context *oc)
363 for (int i = 0; i < oc->opt_count; i++) {
364 struct opt_precomputed *opt = &oc->opts[i];
365 if (!opt->count && (opt->flags & OPT_REQUIRED)) {
366 struct opt_item *item = opt->item;
367 if (item->letter > OPT_POSITIONAL_TAIL)
368 opt_failure("Required positional argument #%d not found.", item->letter - OPT_POSITIONAL_TAIL);
369 else if (item->letter == OPT_POSITIONAL_TAIL)
370 opt_failure("Required positional argument not found.");
371 else if (item->letter && item->name)
372 opt_failure("Required option -%c/--%s not found.", item->letter, item->name);
373 else if (item->letter)
374 opt_failure("Required option -%c not found.", item->letter);
376 opt_failure("Required option --%s not found.", item->name);
381 int opt_parse(const struct opt_section * options, char ** argv) {
382 struct opt_context * oc = alloca(sizeof(*oc));
383 memset(oc, 0, sizeof (*oc));
385 opt_count_items(oc, options);
386 oc->opts = alloca(sizeof(*oc->opts) * oc->opt_count);
387 oc->shortopt = alloca(sizeof(*oc->shortopt) * (oc->positional_max + 257));
388 memset(oc->shortopt, 0, sizeof(*oc->shortopt) * (oc->positional_max + 257));
389 oc->hooks = alloca(sizeof (*oc->hooks) * oc->hook_count);
393 opt_prepare_items(oc, options);
395 int force_positional = 0;
397 for (i=0; argv[i] && !oc->stop_parsing; i++) {
399 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_ARG, NULL, NULL);
400 if (arg[0] != '-' || force_positional)
401 opt_positional(oc, arg);
407 i += opt_longopt(oc, argv, i);
409 i += opt_shortopt(oc, argv, i);
411 opt_positional(oc, arg);
415 opt_check_required(oc);
416 opt_invoke_hooks(oc, OPT_HOOK_FINAL, NULL, NULL);