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,
40 void opt_failure(const char * mesg, ...) {
43 vfprintf(stderr, mesg, args);
44 fprintf(stderr, "\nRun with --help for more information.\n");
45 exit(OPT_EXIT_BAD_ARGS);
48 static char *opt_name(struct opt_context *oc, struct opt_precomputed *opt)
50 struct opt_item *item = opt->item;
52 if (item->letter >= OPT_POSITIONAL_TAIL)
53 res = stk_printf("positional argument #%d", oc->positional_count);
54 else if (opt->flags & OPT_SEEN_AS_LONG)
55 res = stk_printf("--%s", opt->name);
57 res = stk_printf("-%c", item->letter);
61 #define THIS_OPT opt_name(oc, opt)
63 void opt_precompute(struct opt_precomputed *opt, struct opt_item *item)
67 opt->name = item->name;
68 uns flags = item->flags;
70 if (item->letter >= OPT_POSITIONAL_TAIL) {
71 flags &= ~OPT_VALUE_FLAGS;
72 flags |= OPT_REQUIRED_VALUE;
74 if (!(flags & OPT_VALUE_FLAGS)) {
75 ASSERT(item->cls != OPT_CL_CALL && item->cls != OPT_CL_USER);
76 flags |= opt_default_value_flags[item->cls];
82 static void opt_invoke_hooks(struct opt_context *oc, uns event, struct opt_item *item, char *value)
84 for (int i = 0; i < oc->hook_count; i++) {
85 struct opt_item *hook = oc->hooks[i];
86 if (hook->flags & event) {
87 void *data = (hook->flags & OPT_HOOK_INTERNAL) ? oc : hook->ptr;
88 hook->u.hook(item, event, value, data);
93 static struct opt_precomputed * opt_find_item_longopt(struct opt_context * oc, char * str) {
94 uns len = strlen(str);
95 struct opt_precomputed * candidate = NULL;
97 for (int i = 0; i < oc->opt_count; i++) {
98 struct opt_precomputed *opt = &oc->opts[i];
102 if (!strncmp(opt->name, str, len)) {
103 if (strlen(opt->name) == len)
105 } else if (opt->item->cls == OPT_CL_BOOL && !strncmp("no-", str, 3) && !strncmp(opt->name, str+3, len-3)) {
106 if (strlen(opt->name) == len-3)
112 opt_failure("Ambiguous option --%s: matches both --%s and --%s.", str, candidate->name, opt->name);
120 opt_failure("Invalid option --%s.", str);
123 // FIXME: Use simple-lists?
124 #define OPT_PTR(type) ({ \
126 if (item->flags & OPT_MULTIPLE) { \
130 } * n = xmalloc(sizeof(*n)); \
131 clist_add_tail(item->ptr, &(n->n)); \
137 static void opt_parse_value(struct opt_context * oc, struct opt_precomputed * opt, char * value) {
138 struct opt_item * item = opt->item;
140 if (opt->count++ && (opt->flags & OPT_SINGLE))
141 opt_failure("Option %s must be specified at most once.", THIS_OPT);
143 if (opt->flags & OPT_LAST_ARG)
144 oc->stop_parsing = 1;
146 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_VALUE, item, value);
150 if (!value || !strcasecmp(value, "y") || !strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"))
151 *((int *) item->ptr) = 1 ^ (!!(opt->flags & OPT_NEGATIVE));
152 else if (!strcasecmp(value, "n") || !strcasecmp(value, "no") || !strcasecmp(value, "false") || !strcasecmp(value, "0"))
153 *((int *) item->ptr) = 0 ^ (!!(opt->flags & OPT_NEGATIVE));
155 opt_failure("Boolean argument for %s has a strange value. Supported (case insensitive): 1/0, y/n, yes/no, true/false.", THIS_OPT);
160 switch (item->type) {
165 e = cf_parse_int(value, OPT_PTR(int));
167 opt_failure("Integer value parsing failed for %s: %s", THIS_OPT, e);
173 e = cf_parse_u64(value, OPT_PTR(u64));
175 opt_failure("Unsigned 64-bit value parsing failed for %s: %s", THIS_OPT, e);
179 *OPT_PTR(double) = NAN;
181 e = cf_parse_double(value, OPT_PTR(double));
183 opt_failure("Floating-point value parsing failed for %s: %s", THIS_OPT, e);
189 e = cf_parse_ip(value, OPT_PTR(u32));
191 opt_failure("IP address parsing failed for %s: %s", THIS_OPT, e);
195 *OPT_PTR(const char *) = NULL;
197 *OPT_PTR(const char *) = xstrdup(value);
205 if ((opt->flags & OPT_SINGLE) && *((int *)item->ptr) != -1)
206 opt_failure("Multiple switches: %s", THIS_OPT);
208 *((int *)item->ptr) = item->u.value;
211 if (opt->flags & OPT_NEGATIVE)
212 (*((int *)item->ptr))--;
214 (*((int *)item->ptr))++;
218 void *data = (opt->flags & OPT_INTERNAL) ? oc : item->ptr;
219 item->u.call(item, value, data);
225 e = item->u.utype->parser(value, OPT_PTR(void*));
227 opt_failure("Cannot parse the value of %s: %s", THIS_OPT, e);
234 opt_invoke_hooks(oc, OPT_HOOK_AFTER_VALUE, item, value);
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)
330 else if (item->letter || item->name) {
332 if (item->letter > OPT_POSITIONAL_TAIL)
333 oc->positional_max++;
338 static void opt_prepare_items(struct opt_context *oc, const struct opt_section *sec)
340 for (struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
341 if (item->cls == OPT_CL_SECTION)
342 opt_prepare_items(oc, item->u.section);
343 else if (item->cls == OPT_CL_HOOK)
344 oc->hooks[oc->hook_count++] = item;
345 else if (item->letter || item->name) {
346 struct opt_precomputed * opt = &oc->opts[oc->opt_count++];
347 opt_precompute(opt, item);
349 oc->shortopt[(int) item->letter] = opt;
354 static void opt_check_required(struct opt_context *oc)
356 for (int i = 0; i < oc->opt_count; i++) {
357 struct opt_precomputed *opt = &oc->opts[i];
358 if (!opt->count && (opt->flags & OPT_REQUIRED)) {
359 struct opt_item *item = opt->item;
360 if (item->letter > OPT_POSITIONAL_TAIL)
361 opt_failure("Required positional argument #%d not found.", item->letter - OPT_POSITIONAL_TAIL);
362 else if (item->letter == OPT_POSITIONAL_TAIL)
363 opt_failure("Required positional argument not found.");
364 else if (item->letter && item->name)
365 opt_failure("Required option -%c/--%s not found.", item->letter, item->name);
366 else if (item->letter)
367 opt_failure("Required option -%c not found.", item->letter);
369 opt_failure("Required option --%s not found.", item->name);
374 int opt_parse(const struct opt_section * options, char ** argv) {
375 struct opt_context * oc = alloca(sizeof(*oc));
376 memset(oc, 0, sizeof (*oc));
377 oc->options = options;
379 opt_count_items(oc, options);
380 oc->opts = alloca(sizeof(*oc->opts) * oc->opt_count);
381 oc->shortopt = alloca(sizeof(*oc->shortopt) * (oc->positional_max + 257));
382 memset(oc->shortopt, 0, sizeof(*oc->shortopt) * (oc->positional_max + 257));
383 oc->hooks = alloca(sizeof (*oc->hooks) * oc->hook_count);
387 opt_prepare_items(oc, options);
389 int force_positional = 0;
391 for (i=0; argv[i] && !oc->stop_parsing; i++) {
393 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_ARG, NULL, NULL);
394 if (arg[0] != '-' || force_positional)
395 opt_positional(oc, arg);
401 i += opt_longopt(oc, argv, i);
403 i += opt_shortopt(oc, argv, i);
405 opt_positional(oc, arg);
409 opt_check_required(oc);
410 opt_invoke_hooks(oc, OPT_HOOK_FINAL, NULL, NULL);