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Add formats for client and server UID and user (for multiuser setups).
[tmux.git] / arguments.c
blob37cd02360037701c739dae76ac357b284ed9d9ea
1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <ctype.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <vis.h>
25
26 #include "tmux.h"
27
28 /*
29 * Manipulate command arguments.
30 */
31
32 /* List of argument values. */
33 TAILQ_HEAD(args_values, args_value);
34
35 /* Single arguments flag. */
36 struct args_entry {
37 u_char flag;
38 struct args_values values;
39 u_int count;
40 RB_ENTRY(args_entry) entry;
41 };
42
43 /* Parsed argument flags and values. */
44 struct args {
45 struct args_tree tree;
46 u_int count;
47 struct args_value *values;
48 };
49
50 /* Prepared command state. */
51 struct args_command_state {
52 struct cmd_list *cmdlist;
53 char *cmd;
54 struct cmd_parse_input pi;
55 };
56
57 static struct args_entry *args_find(struct args *, u_char);
58
59 static int args_cmp(struct args_entry *, struct args_entry *);
60 RB_GENERATE_STATIC(args_tree, args_entry, entry, args_cmp);
61
62 /* Arguments tree comparison function. */
63 static int
64 args_cmp(struct args_entry *a1, struct args_entry *a2)
65 {
66 return (a1->flag - a2->flag);
67 }
68
69 /* Find a flag in the arguments tree. */
70 static struct args_entry *
71 args_find(struct args *args, u_char flag)
72 {
73 struct args_entry entry;
74
75 entry.flag = flag;
76 return (RB_FIND(args_tree, &args->tree, &entry));
77 }
78
79 /* Copy value. */
80 static void
81 args_copy_value(struct args_value *to, struct args_value *from)
82 {
83 to->type = from->type;
84 switch (from->type) {
85 case ARGS_NONE:
86 break;
87 case ARGS_COMMANDS:
88 to->cmdlist = from->cmdlist;
89 to->cmdlist->references++;
90 break;
91 case ARGS_STRING:
92 to->string = xstrdup(from->string);
93 break;
94 }
95 }
96
97 /* Get value as string. */
98 static const char *
99 args_value_as_string(struct args_value *value)
100 {
101 switch (value->type) {
102 case ARGS_NONE:
103 return ("");
104 case ARGS_COMMANDS:
105 if (value->cached == NULL)
106 value->cached = cmd_list_print(value->cmdlist, 0);
107 return (value->cached);
108 case ARGS_STRING:
109 return (value->string);
110 }
111 fatalx("unexpected argument type");
112 }
113
114 /* Create an empty arguments set. */
115 struct args *
116 args_create(void)
117 {
118 struct args *args;
119
120 args = xcalloc(1, sizeof *args);
121 RB_INIT(&args->tree);
122 return (args);
123 }
124
125 /* Parse arguments into a new argument set. */
126 struct args *
127 args_parse(const struct args_parse *parse, struct args_value *values,
128 u_int count, char **cause)
129 {
130 struct args *args;
131 u_int i;
132 enum args_parse_type type;
133 struct args_value *value, *new;
134 u_char flag;
135 const char *found, *string, *s;
136 int optional_argument;
137
138 if (count == 0)
139 return (args_create());
140
141 args = args_create();
142 for (i = 1; i < count; /* nothing */) {
143 value = &values[i];
144 if (value->type != ARGS_STRING)
145 break;
146
147 string = value->string;
148 if (*string++ != '-' || *string == '\0')
149 break;
150 i++;
151 if (string[0] == '-' && string[1] == '\0')
152 break;
153
154 for (;;) {
155 flag = *string++;
156 if (flag == '\0')
157 break;
158 if (flag == '?') {
159 args_free(args);
160 return (NULL);
161 }
162 if (!isalnum(flag)) {
163 xasprintf(cause, "invalid flag -%c", flag);
164 args_free(args);
165 return (NULL);
166 }
167 found = strchr(parse->template, flag);
168 if (found == NULL) {
169 xasprintf(cause, "unknown flag -%c", flag);
170 args_free(args);
171 return (NULL);
172 }
173 if (*++found != ':') {
174 log_debug("%s: -%c", __func__, flag);
175 args_set(args, flag, NULL);
176 continue;
177 }
178 if (*found == ':') {
179 optional_argument = 1;
180 found++;
181 }
182 new = xcalloc(1, sizeof *new);
183 if (*string != '\0') {
184 new->type = ARGS_STRING;
185 new->string = xstrdup(string);
186 } else {
187 if (i == count) {
188 if (optional_argument) {
189 log_debug("%s: -%c", __func__,
190 flag);
191 args_set(args, flag, NULL);
192 continue;
193 }
194 xasprintf(cause,
195 "-%c expects an argument",
196 flag);
197 args_free(args);
198 return (NULL);
199 }
200 if (values[i].type != ARGS_STRING) {
201 xasprintf(cause,
202 "-%c argument must be a string",
203 flag);
204 args_free(args);
205 return (NULL);
206 }
207 args_copy_value(new, &values[i++]);
208 }
209 s = args_value_as_string(new);
210 log_debug("%s: -%c = %s", __func__, flag, s);
211 args_set(args, flag, new);
212 break;
213 }
214 }
215 log_debug("%s: flags end at %u of %u", __func__, i, count);
216 if (i != count) {
217 for (/* nothing */; i < count; i++) {
218 value = &values[i];
219
220 s = args_value_as_string(value);
221 log_debug("%s: %u = %s (type %d)", __func__, i, s,
222 value->type);
223
224 if (parse->cb != NULL) {
225 type = parse->cb(args, args->count, cause);
226 if (type == ARGS_PARSE_INVALID) {
227 args_free(args);
228 return (NULL);
229 }
230 } else
231 type = ARGS_PARSE_STRING;
232
233 args->values = xrecallocarray(args->values,
234 args->count, args->count + 1, sizeof *args->values);
235 new = &args->values[args->count++];
236
237 switch (type) {
238 case ARGS_PARSE_INVALID:
239 fatalx("unexpected argument type");
240 case ARGS_PARSE_STRING:
241 if (value->type != ARGS_STRING) {
242 xasprintf(cause,
243 "argument %u must be \"string\"",
244 args->count);
245 args_free(args);
246 return (NULL);
247 }
248 args_copy_value(new, value);
249 break;
250 case ARGS_PARSE_COMMANDS_OR_STRING:
251 args_copy_value(new, value);
252 break;
253 case ARGS_PARSE_COMMANDS:
254 if (value->type != ARGS_COMMANDS) {
255 xasprintf(cause,
256 "argument %u must be { commands }",
257 args->count);
258 args_free(args);
259 return (NULL);
260 }
261 args_copy_value(new, value);
262 break;
263 }
264 }
265 }
266
267 if (parse->lower != -1 && args->count < (u_int)parse->lower) {
268 xasprintf(cause,
269 "too few arguments (need at least %u)",
270 parse->lower);
271 args_free(args);
272 return (NULL);
273 }
274 if (parse->upper != -1 && args->count > (u_int)parse->upper) {
275 xasprintf(cause,
276 "too many arguments (need at most %u)",
277 parse->upper);
278 args_free(args);
279 return (NULL);
280 }
281 return (args);
282 }
283
284 /* Copy and expand a value. */
285 static void
286 args_copy_copy_value(struct args_value *to, struct args_value *from, int argc,
287 char **argv)
288 {
289 char *s, *expanded;
290 int i;
291
292 to->type = from->type;
293 switch (from->type) {
294 case ARGS_NONE:
295 break;
296 case ARGS_STRING:
297 expanded = xstrdup(from->string);
298 for (i = 0; i < argc; i++) {
299 s = cmd_template_replace(expanded, argv[i], i + 1);
300 free(expanded);
301 expanded = s;
302 }
303 to->string = expanded;
304 break;
305 case ARGS_COMMANDS:
306 to->cmdlist = cmd_list_copy(from->cmdlist, argc, argv);
307 break;
308 }
309 }
310
311 /* Copy an arguments set. */
312 struct args *
313 args_copy(struct args *args, int argc, char **argv)
314 {
315 struct args *new_args;
316 struct args_entry *entry;
317 struct args_value *value, *new_value;
318 u_int i;
319
320 cmd_log_argv(argc, argv, "%s", __func__);
321
322 new_args = args_create();
323 RB_FOREACH(entry, args_tree, &args->tree) {
324 if (TAILQ_EMPTY(&entry->values)) {
325 for (i = 0; i < entry->count; i++)
326 args_set(new_args, entry->flag, NULL);
327 continue;
328 }
329 TAILQ_FOREACH(value, &entry->values, entry) {
330 new_value = xcalloc(1, sizeof *new_value);
331 args_copy_copy_value(new_value, value, argc, argv);
332 args_set(new_args, entry->flag, new_value);
333 }
334 }
335 if (args->count == 0)
336 return (new_args);
337 new_args->count = args->count;
338 new_args->values = xcalloc(args->count, sizeof *new_args->values);
339 for (i = 0; i < args->count; i++) {
340 new_value = &new_args->values[i];
341 args_copy_copy_value(new_value, &args->values[i], argc, argv);
342 }
343 return (new_args);
344 }
345
346 /* Free a value. */
347 void
348 args_free_value(struct args_value *value)
349 {
350 switch (value->type) {
351 case ARGS_NONE:
352 break;
353 case ARGS_STRING:
354 free(value->string);
355 break;
356 case ARGS_COMMANDS:
357 cmd_list_free(value->cmdlist);
358 break;
359 }
360 free(value->cached);
361 }
362
363 /* Free values. */
364 void
365 args_free_values(struct args_value *values, u_int count)
366 {
367 u_int i;
368
369 for (i = 0; i < count; i++)
370 args_free_value(&values[i]);
371 }
372
373 /* Free an arguments set. */
374 void
375 args_free(struct args *args)
376 {
377 struct args_entry *entry;
378 struct args_entry *entry1;
379 struct args_value *value;
380 struct args_value *value1;
381
382 args_free_values(args->values, args->count);
383 free(args->values);
384
385 RB_FOREACH_SAFE(entry, args_tree, &args->tree, entry1) {
386 RB_REMOVE(args_tree, &args->tree, entry);
387 TAILQ_FOREACH_SAFE(value, &entry->values, entry, value1) {
388 TAILQ_REMOVE(&entry->values, value, entry);
389 args_free_value(value);
390 free(value);
391 }
392 free(entry);
393 }
394
395 free(args);
396 }
397
398 /* Convert arguments to vector. */
399 void
400 args_to_vector(struct args *args, int *argc, char ***argv)
401 {
402 char *s;
403 u_int i;
404
405 *argc = 0;
406 *argv = NULL;
407
408 for (i = 0; i < args->count; i++) {
409 switch (args->values[i].type) {
410 case ARGS_NONE:
411 break;
412 case ARGS_STRING:
413 cmd_append_argv(argc, argv, args->values[i].string);
414 break;
415 case ARGS_COMMANDS:
416 s = cmd_list_print(args->values[i].cmdlist, 0);
417 cmd_append_argv(argc, argv, s);
418 free(s);
419 break;
420 }
421 }
422 }
423
424 /* Convert arguments from vector. */
425 struct args_value *
426 args_from_vector(int argc, char **argv)
427 {
428 struct args_value *values;
429 int i;
430
431 values = xcalloc(argc, sizeof *values);
432 for (i = 0; i < argc; i++) {
433 values[i].type = ARGS_STRING;
434 values[i].string = xstrdup(argv[i]);
435 }
436 return (values);
437 }
438
439 /* Add to string. */
440 static void printflike(3, 4)
441 args_print_add(char **buf, size_t *len, const char *fmt, ...)
442 {
443 va_list ap;
444 char *s;
445 size_t slen;
446
447 va_start(ap, fmt);
448 slen = xvasprintf(&s, fmt, ap);
449 va_end(ap);
450
451 *len += slen;
452 *buf = xrealloc(*buf, *len);
453
454 strlcat(*buf, s, *len);
455 free(s);
456 }
457
458 /* Add value to string. */
459 static void
460 args_print_add_value(char **buf, size_t *len, struct args_value *value)
461 {
462 char *expanded = NULL;
463
464 if (**buf != '\0')
465 args_print_add(buf, len, " ");
466
467 switch (value->type) {
468 case ARGS_NONE:
469 break;
470 case ARGS_COMMANDS:
471 expanded = cmd_list_print(value->cmdlist, 0);
472 args_print_add(buf, len, "{ %s }", expanded);
473 break;
474 case ARGS_STRING:
475 expanded = args_escape(value->string);
476 args_print_add(buf, len, "%s", expanded);
477 break;
478 }
479 free(expanded);
480 }
481
482 /* Print a set of arguments. */
483 char *
484 args_print(struct args *args)
485 {
486 size_t len;
487 char *buf;
488 u_int i, j;
489 struct args_entry *entry;
490 struct args_value *value;
491
492 len = 1;
493 buf = xcalloc(1, len);
494
495 /* Process the flags first. */
496 RB_FOREACH(entry, args_tree, &args->tree) {
497 if (!TAILQ_EMPTY(&entry->values))
498 continue;
499
500 if (*buf == '\0')
501 args_print_add(&buf, &len, "-");
502 for (j = 0; j < entry->count; j++)
503 args_print_add(&buf, &len, "%c", entry->flag);
504 }
505
506 /* Then the flags with arguments. */
507 RB_FOREACH(entry, args_tree, &args->tree) {
508 TAILQ_FOREACH(value, &entry->values, entry) {
509 if (*buf != '\0')
510 args_print_add(&buf, &len, " -%c", entry->flag);
511 else
512 args_print_add(&buf, &len, "-%c", entry->flag);
513 args_print_add_value(&buf, &len, value);
514 }
515 }
516
517 /* And finally the argument vector. */
518 for (i = 0; i < args->count; i++)
519 args_print_add_value(&buf, &len, &args->values[i]);
520
521 return (buf);
522 }
523
524 /* Escape an argument. */
525 char *
526 args_escape(const char *s)
527 {
528 static const char dquoted[] = " #';${}%";
529 static const char squoted[] = " \"";
530 char *escaped, *result;
531 int flags, quotes = 0;
532
533 if (*s == '\0') {
534 xasprintf(&result, "''");
535 return (result);
536 }
537 if (s[strcspn(s, dquoted)] != '\0')
538 quotes = '"';
539 else if (s[strcspn(s, squoted)] != '\0')
540 quotes = '\'';
541
542 if (s[0] != ' ' &&
543 s[1] == '\0' &&
544 (quotes != 0 || s[0] == '~')) {
545 xasprintf(&escaped, "\\%c", s[0]);
546 return (escaped);
547 }
548
549 flags = VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL;
550 if (quotes == '"')
551 flags |= VIS_DQ;
552 utf8_stravis(&escaped, s, flags);
553
554 if (quotes == '\'')
555 xasprintf(&result, "'%s'", escaped);
556 else if (quotes == '"') {
557 if (*escaped == '~')
558 xasprintf(&result, "\"\\%s\"", escaped);
559 else
560 xasprintf(&result, "\"%s\"", escaped);
561 } else {
562 if (*escaped == '~')
563 xasprintf(&result, "\\%s", escaped);
564 else
565 result = xstrdup(escaped);
566 }
567 free(escaped);
568 return (result);
569 }
570
571 /* Return if an argument is present. */
572 int
573 args_has(struct args *args, u_char flag)
574 {
575 struct args_entry *entry;
576
577 entry = args_find(args, flag);
578 if (entry == NULL)
579 return (0);
580 return (entry->count);
581 }
582
583 /* Set argument value in the arguments tree. */
584 void
585 args_set(struct args *args, u_char flag, struct args_value *value)
586 {
587 struct args_entry *entry;
588
589 entry = args_find(args, flag);
590 if (entry == NULL) {
591 entry = xcalloc(1, sizeof *entry);
592 entry->flag = flag;
593 entry->count = 1;
594 TAILQ_INIT(&entry->values);
595 RB_INSERT(args_tree, &args->tree, entry);
596 } else
597 entry->count++;
598 if (value != NULL && value->type != ARGS_NONE)
599 TAILQ_INSERT_TAIL(&entry->values, value, entry);
600 }
601
602 /* Get argument value. Will be NULL if it isn't present. */
603 const char *
604 args_get(struct args *args, u_char flag)
605 {
606 struct args_entry *entry;
607
608 if ((entry = args_find(args, flag)) == NULL)
609 return (NULL);
610 if (TAILQ_EMPTY(&entry->values))
611 return (NULL);
612 return (TAILQ_LAST(&entry->values, args_values)->string);
613 }
614
615 /* Get first argument. */
616 u_char
617 args_first(struct args *args, struct args_entry **entry)
618 {
619 *entry = RB_MIN(args_tree, &args->tree);
620 if (*entry == NULL)
621 return (0);
622 return ((*entry)->flag);
623 }
624
625 /* Get next argument. */
626 u_char
627 args_next(struct args_entry **entry)
628 {
629 *entry = RB_NEXT(args_tree, &args->tree, *entry);
630 if (*entry == NULL)
631 return (0);
632 return ((*entry)->flag);
633 }
634
635 /* Get argument count. */
636 u_int
637 args_count(struct args *args)
638 {
639 return (args->count);
640 }
641
642 /* Get argument values. */
643 struct args_value *
644 args_values(struct args *args)
645 {
646 return (args->values);
647 }
648
649 /* Get argument value. */
650 struct args_value *
651 args_value(struct args *args, u_int idx)
652 {
653 if (idx >= args->count)
654 return (NULL);
655 return (&args->values[idx]);
656 }
657
658 /* Return argument as string. */
659 const char *
660 args_string(struct args *args, u_int idx)
661 {
662 if (idx >= args->count)
663 return (NULL);
664 return (args_value_as_string(&args->values[idx]));
665 }
666
667 /* Make a command now. */
668 struct cmd_list *
669 args_make_commands_now(struct cmd *self, struct cmdq_item *item, u_int idx,
670 int expand)
671 {
672 struct args_command_state *state;
673 char *error;
674 struct cmd_list *cmdlist;
675
676 state = args_make_commands_prepare(self, item, idx, NULL, 0, expand);
677 cmdlist = args_make_commands(state, 0, NULL, &error);
678 if (cmdlist == NULL) {
679 cmdq_error(item, "%s", error);
680 free(error);
681 }
682 else
683 cmdlist->references++;
684 args_make_commands_free(state);
685 return (cmdlist);
686 }
687
688 /* Save bits to make a command later. */
689 struct args_command_state *
690 args_make_commands_prepare(struct cmd *self, struct cmdq_item *item, u_int idx,
691 const char *default_command, int wait, int expand)
692 {
693 struct args *args = cmd_get_args(self);
694 struct cmd_find_state *target = cmdq_get_target(item);
695 struct client *tc = cmdq_get_target_client(item);
696 struct args_value *value;
697 struct args_command_state *state;
698 const char *cmd;
699
700 state = xcalloc(1, sizeof *state);
701
702 if (idx < args->count) {
703 value = &args->values[idx];
704 if (value->type == ARGS_COMMANDS) {
705 state->cmdlist = value->cmdlist;
706 state->cmdlist->references++;
707 return (state);
708 }
709 cmd = value->string;
710 } else {
711 if (default_command == NULL)
712 fatalx("argument out of range");
713 cmd = default_command;
714 }
715
716
717 if (expand)
718 state->cmd = format_single_from_target(item, cmd);
719 else
720 state->cmd = xstrdup(cmd);
721 log_debug("%s: %s", __func__, state->cmd);
722
723 if (wait)
724 state->pi.item = item;
725 cmd_get_source(self, &state->pi.file, &state->pi.line);
726 state->pi.c = tc;
727 if (state->pi.c != NULL)
728 state->pi.c->references++;
729 cmd_find_copy_state(&state->pi.fs, target);
730
731 return (state);
732 }
733
734 /* Return argument as command. */
735 struct cmd_list *
736 args_make_commands(struct args_command_state *state, int argc, char **argv,
737 char **error)
738 {
739 struct cmd_parse_result *pr;
740 char *cmd, *new_cmd;
741 int i;
742
743 if (state->cmdlist != NULL) {
744 if (argc == 0)
745 return (state->cmdlist);
746 return (cmd_list_copy(state->cmdlist, argc, argv));
747 }
748
749 cmd = xstrdup(state->cmd);
750 for (i = 0; i < argc; i++) {
751 new_cmd = cmd_template_replace(cmd, argv[i], i + 1);
752 log_debug("%s: %%%u %s: %s", __func__, i + 1, argv[i], new_cmd);
753 free(cmd);
754 cmd = new_cmd;
755 }
756 log_debug("%s: %s", __func__, cmd);
757
758 pr = cmd_parse_from_string(cmd, &state->pi);
759 free(cmd);
760 switch (pr->status) {
761 case CMD_PARSE_ERROR:
762 *error = pr->error;
763 return (NULL);
764 case CMD_PARSE_SUCCESS:
765 return (pr->cmdlist);
766 }
767 fatalx("invalid parse return state");
768 }
769
770 /* Free commands state. */
771 void
772 args_make_commands_free(struct args_command_state *state)
773 {
774 if (state->cmdlist != NULL)
775 cmd_list_free(state->cmdlist);
776 if (state->pi.c != NULL)
777 server_client_unref(state->pi.c);
778 free(state->cmd);
779 free(state);
780 }
781
782 /* Get prepared command. */
783 char *
784 args_make_commands_get_command(struct args_command_state *state)
785 {
786 struct cmd *first;
787 int n;
788 char *s;
789
790 if (state->cmdlist != NULL) {
791 first = cmd_list_first(state->cmdlist);
792 if (first == NULL)
793 return (xstrdup(""));
794 return (xstrdup(cmd_get_entry(first)->name));
795 }
796 n = strcspn(state->cmd, " ,");
797 xasprintf(&s, "%.*s", n, state->cmd);
798 return (s);
799 }
800
801 /* Get first value in argument. */
802 struct args_value *
803 args_first_value(struct args *args, u_char flag)
804 {
805 struct args_entry *entry;
806
807 if ((entry = args_find(args, flag)) == NULL)
808 return (NULL);
809 return (TAILQ_FIRST(&entry->values));
810 }
811
812 /* Get next value in argument. */
813 struct args_value *
814 args_next_value(struct args_value *value)
815 {
816 return (TAILQ_NEXT(value, entry));
817 }
818
819 /* Convert an argument value to a number. */
820 long long
821 args_strtonum(struct args *args, u_char flag, long long minval,
822 long long maxval, char **cause)
823 {
824 const char *errstr;
825 long long ll;
826 struct args_entry *entry;
827 struct args_value *value;
828
829 if ((entry = args_find(args, flag)) == NULL) {
830 *cause = xstrdup("missing");
831 return (0);
832 }
833 value = TAILQ_LAST(&entry->values, args_values);
834
835 ll = strtonum(value->string, minval, maxval, &errstr);
836 if (errstr != NULL) {
837 *cause = xstrdup(errstr);
838 return (0);
839 }
840
841 *cause = NULL;
842 return (ll);
843 }
844
845 /* Convert an argument to a number which may be a percentage. */
846 long long
847 args_percentage(struct args *args, u_char flag, long long minval,
848 long long maxval, long long curval, char **cause)
849 {
850 const char *value;
851 struct args_entry *entry;
852
853 if ((entry = args_find(args, flag)) == NULL) {
854 *cause = xstrdup("missing");
855 return (0);
856 }
857 value = TAILQ_LAST(&entry->values, args_values)->string;
858 return (args_string_percentage(value, minval, maxval, curval, cause));
859 }
860
861 /* Convert a string to a number which may be a percentage. */
862 long long
863 args_string_percentage(const char *value, long long minval, long long maxval,
864 long long curval, char **cause)
865 {
866 const char *errstr;
867 long long ll;
868 size_t valuelen = strlen(value);
869 char *copy;
870
871 if (value[valuelen - 1] == '%') {
872 copy = xstrdup(value);
873 copy[valuelen - 1] = '\0';
874
875 ll = strtonum(copy, 0, 100, &errstr);
876 free(copy);
877 if (errstr != NULL) {
878 *cause = xstrdup(errstr);
879 return (0);
880 }
881 ll = (curval * ll) / 100;
882 if (ll < minval) {
883 *cause = xstrdup("too small");
884 return (0);
885 }
886 if (ll > maxval) {
887 *cause = xstrdup("too large");
888 return (0);
889 }
890 } else {
891 ll = strtonum(value, minval, maxval, &errstr);
892 if (errstr != NULL) {
893 *cause = xstrdup(errstr);
894 return (0);
895 }
896 }
897
898 *cause = NULL;
899 return (ll);
900 }
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