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>
15 #include <ucw/stkstring.h>
16 #include <ucw/strtonum.h>
21 static uint opt_default_value_flags[] = {
22 [OPT_CL_BOOL] = OPT_NO_VALUE,
23 [OPT_CL_STATIC] = OPT_MAYBE_VALUE,
24 [OPT_CL_MULTIPLE] = OPT_REQUIRED_VALUE,
25 [OPT_CL_SWITCH] = OPT_NO_VALUE,
26 [OPT_CL_INC] = OPT_NO_VALUE,
32 void opt_failure(const char * mesg, ...) {
35 vfprintf(stderr, mesg, args);
36 fprintf(stderr, "\nRun with --help for more information.\n");
37 exit(OPT_EXIT_BAD_ARGS);
40 static char *opt_name(struct opt_context *oc, struct opt_precomputed *opt)
42 const struct opt_item *item = opt->item;
44 if (item->letter >= OPT_POSITIONAL_TAIL)
45 res = stk_printf("positional argument #%d", oc->positional_count);
46 else if (opt->flags & OPT_SEEN_AS_LONG)
47 res = stk_printf("--%s", opt->name);
49 res = stk_printf("-%c", item->letter);
53 #define THIS_OPT opt_name(oc, opt)
55 void opt_precompute(struct opt_precomputed *opt, const struct opt_item *item)
59 opt->name = item->name;
60 uint flags = item->flags;
62 if (item->letter >= OPT_POSITIONAL_TAIL) {
63 flags &= ~OPT_VALUE_FLAGS;
64 flags |= OPT_REQUIRED_VALUE;
66 if (!(flags & OPT_VALUE_FLAGS)) {
67 ASSERT(item->cls != OPT_CL_CALL);
68 flags |= opt_default_value_flags[item->cls];
74 static void opt_invoke_hooks(struct opt_context *oc, uint event, const struct opt_item *item, char *value)
76 for (int i = 0; i < oc->hook_count; i++) {
77 const struct opt_item *hook = oc->hooks[i];
78 if (hook->flags & event) {
79 void *data = (hook->flags & OPT_HOOK_INTERNAL) ? oc : hook->ptr;
80 hook->u.hook(item, event, value, data);
85 static struct opt_precomputed * opt_find_item_longopt(struct opt_context * oc, char * str) {
86 uint len = strlen(str);
87 struct opt_precomputed * candidate = NULL;
89 for (int i = 0; i < oc->opt_count; i++) {
90 struct opt_precomputed *opt = &oc->opts[i];
94 if (!strncmp(opt->name, str, len)) {
95 if (strlen(opt->name) == len)
97 } else if (opt->item->cls == OPT_CL_BOOL) {
98 if (opt->flags & OPT_NEGATIVE) {
99 // If the option is called no-X, match X as well
100 if (!strncmp("no-", opt->name, 3) && !strncmp(opt->name+3, str, len)) {
101 if (strlen(opt->name) == len+3)
106 // Match no-X as well
107 if (!strncmp("no-", str, 3) && !strncmp(opt->name, str+3, len-3)) {
108 if (strlen(opt->name) == len-3)
117 opt_failure("Ambiguous option --%s: matches both --%s and --%s.", str, candidate->name, opt->name);
125 opt_failure("Invalid option --%s.", str);
128 static void opt_parse_value(struct opt_context * oc, struct opt_precomputed * opt, char * value) {
129 const struct opt_item * item = opt->item;
131 if (opt->count++ && (opt->flags & OPT_SINGLE))
132 opt_failure("Option %s must be specified at most once.", THIS_OPT);
134 if (opt->flags & OPT_LAST_ARG)
135 oc->stop_parsing = 1;
137 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_VALUE, item, value);
141 if (!value || !strcasecmp(value, "y") || !strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"))
142 *((int *) item->ptr) = 1 ^ (!!(opt->flags & OPT_NEGATIVE));
143 else if (!strcasecmp(value, "n") || !strcasecmp(value, "no") || !strcasecmp(value, "false") || !strcasecmp(value, "0"))
144 *((int *) item->ptr) = 0 ^ (!!(opt->flags & OPT_NEGATIVE));
146 opt_failure("Boolean argument for %s has a strange value. Supported (case insensitive): 1/0, y/n, yes/no, true/false.", THIS_OPT);
149 case OPT_CL_MULTIPLE:
153 if (item->cls == OPT_CL_STATIC)
156 ptr = GARY_PUSH_GENERIC(*(void **)item->ptr);
157 #define OPT_PTR(type) ((type *) ptr)
158 switch (item->type) {
163 e = cf_parse_int(value, OPT_PTR(int));
165 opt_failure("Integer value parsing failed for %s: %s", THIS_OPT, e);
171 e = cf_parse_u64(value, OPT_PTR(u64));
173 opt_failure("Unsigned 64-bit value parsing failed for %s: %s", THIS_OPT, e);
177 *OPT_PTR(double) = NAN;
179 e = cf_parse_double(value, OPT_PTR(double));
181 opt_failure("Floating-point value parsing failed for %s: %s", THIS_OPT, e);
187 e = cf_parse_ip(value, OPT_PTR(u32));
189 opt_failure("IP address parsing failed for %s: %s", THIS_OPT, e);
193 *OPT_PTR(const char *) = NULL;
195 *OPT_PTR(const char *) = xstrdup(value);
199 char * e = item->u.utype->parser(value, ptr);
201 opt_failure("Cannot parse the value of %s: %s", THIS_OPT, e);
211 if ((opt->flags & OPT_SINGLE) && *((int *)item->ptr) != -1)
212 opt_failure("Multiple switches: %s", THIS_OPT);
214 *((int *)item->ptr) = item->u.value;
217 if (opt->flags & OPT_NEGATIVE)
218 (*((int *)item->ptr))--;
220 (*((int *)item->ptr))++;
224 void *data = (opt->flags & OPT_INTERNAL) ? oc : item->ptr;
225 item->u.call(item, value, data);
229 oc->stop_parsing = 2;
235 opt_invoke_hooks(oc, OPT_HOOK_AFTER_VALUE, item, value);
238 static int opt_longopt(struct opt_context * oc, char ** argv, int index) {
240 char * name_in = argv[index] + 2; // skipping the -- on the beginning
241 uint pos = strchrnul(name_in, '=') - name_in;
242 struct opt_precomputed * opt = opt_find_item_longopt(oc, strndupa(name_in, pos));
245 opt->flags |= OPT_SEEN_AS_LONG;
247 if (opt->item->cls == OPT_CL_BOOL &&
248 ((opt->flags & OPT_NEGATIVE)
249 ? (!strncmp(opt->item->name, "no-", 3) && !strncmp(name_in, opt->item->name + 3, pos-3))
250 : (!strncmp(name_in, "no-", 3) && !strncmp(name_in+3, opt->item->name, pos-3)))) {
252 opt_failure("Option --%s must not have any value.", name_in);
254 } else if (opt->flags & OPT_REQUIRED_VALUE) {
256 value = name_in + pos + 1;
258 value = argv[index+1];
260 opt_failure("Option %s must have a value, but nothing supplied.", THIS_OPT);
263 } else if (opt->flags & OPT_MAYBE_VALUE) {
265 value = name_in + pos + 1;
268 opt_failure("Option %s must have no value.", THIS_OPT);
270 opt_parse_value(oc, opt, value);
274 static int opt_shortopt(struct opt_context * oc, char ** argv, int index) {
276 struct opt_precomputed * opt;
279 while (o = argv[index][++chr]) {
280 if (o < 0 || o >= 128)
281 opt_failure("Invalid character 0x%02x in option name. Only ASCII is allowed.", o & 0xff);
282 opt = oc->shortopt[o];
285 opt_failure("Unknown option -%c.", o);
287 opt->flags &= ~OPT_SEEN_AS_LONG;
289 if (opt->flags & OPT_NO_VALUE)
290 opt_parse_value(oc, opt, NULL);
291 else if (opt->flags & OPT_REQUIRED_VALUE) {
292 if (argv[index][chr+1]) {
293 opt_parse_value(oc, opt, argv[index] + chr + 1);
295 } else if (!argv[index+1])
296 opt_failure("Option -%c must have a value, but nothing supplied.", o);
298 opt_parse_value(oc, opt, argv[index+1]);
301 } else if (opt->flags & OPT_MAYBE_VALUE) {
302 if (argv[index][chr+1]) {
303 opt_parse_value(oc, opt, argv[index] + chr + 1);
306 opt_parse_value(oc, opt, NULL);
315 static void opt_positional(struct opt_context * oc, char * value) {
316 oc->positional_count++;
317 uint id = oc->positional_count > oc->positional_max ? OPT_POSITIONAL_TAIL : OPT_POSITIONAL(oc->positional_count);
318 struct opt_precomputed * opt = oc->shortopt[id];
320 opt_failure("Too many positional arguments.");
322 opt->flags &= ~OPT_SEEN_AS_LONG;
323 opt_parse_value(oc, opt, value);
327 static void opt_count_items(struct opt_context *oc, const struct opt_section *sec)
329 for (const struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
330 if (item->cls == OPT_CL_SECTION)
331 opt_count_items(oc, item->u.section);
332 else if (item->cls == OPT_CL_HOOK)
334 else if (item->letter || item->name) {
336 if (item->letter > OPT_POSITIONAL_TAIL)
337 oc->positional_max++;
342 static void opt_prepare_items(struct opt_context *oc, const struct opt_section *sec)
344 for (const struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
345 if (item->cls == OPT_CL_SECTION)
346 opt_prepare_items(oc, item->u.section);
347 else if (item->cls == OPT_CL_HOOK)
348 oc->hooks[oc->hook_count++] = item;
349 else if (item->letter || item->name) {
350 struct opt_precomputed * opt = &oc->opts[oc->opt_count++];
351 opt_precompute(opt, item);
353 oc->shortopt[(int) item->letter] = opt;
358 static void opt_check_required(struct opt_context *oc)
360 for (int i = 0; i < oc->opt_count; i++) {
361 struct opt_precomputed *opt = &oc->opts[i];
362 if (!opt->count && (opt->flags & OPT_REQUIRED)) {
363 const struct opt_item *item = opt->item;
364 if (item->letter > OPT_POSITIONAL_TAIL)
365 opt_failure("Required positional argument #%d not found.", item->letter - OPT_POSITIONAL_TAIL);
366 else if (item->letter == OPT_POSITIONAL_TAIL)
367 opt_failure("Required positional argument not found.");
368 else if (item->letter && item->name)
369 opt_failure("Required option -%c/--%s not found.", item->letter, item->name);
370 else if (item->letter)
371 opt_failure("Required option -%c not found.", item->letter);
373 opt_failure("Required option --%s not found.", item->name);
378 int opt_parse(const struct opt_section * options, char ** argv) {
379 struct opt_context * oc = alloca(sizeof(*oc));
380 memset(oc, 0, sizeof (*oc));
381 oc->options = options;
383 opt_count_items(oc, options);
384 oc->opts = alloca(sizeof(*oc->opts) * oc->opt_count);
385 oc->shortopt = alloca(sizeof(*oc->shortopt) * (oc->positional_max + OPT_POSITIONAL_TAIL + 1));
386 memset(oc->shortopt, 0, sizeof(*oc->shortopt) * (oc->positional_max + OPT_POSITIONAL_TAIL + 1));
387 oc->hooks = alloca(sizeof (*oc->hooks) * oc->hook_count);
391 opt_prepare_items(oc, options);
393 int force_positional = 0;
395 for (i=0; argv[i] && !oc->stop_parsing; i++) {
398 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_ARG, NULL, NULL);
399 if (arg[0] != '-' || force_positional)
400 opt_positional(oc, arg);
406 i += opt_longopt(oc, argv, i);
408 i += opt_shortopt(oc, argv, i);
410 opt_positional(oc, arg);
414 opt_check_required(oc);
415 opt_invoke_hooks(oc, OPT_HOOK_FINAL, NULL, NULL);
416 return (oc->stop_parsing < 2 ? i : start_i);