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Do not dereference NULL window when resizing client, GitHub issue 2982.
[tmux-openbsd.git] / arguments.c
blob17bc12ec273854e4977652cf4789b290544864fb
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, argument;
135 const char *found, *string, *s;
136
137 if (count == 0)
138 return (args_create());
139
140 args = args_create();
141 for (i = 1; i < count; /* nothing */) {
142 value = &values[i];
143 if (value->type != ARGS_STRING)
144 break;
145
146 string = value->string;
147 if (*string++ != '-' || *string == '\0')
148 break;
149 i++;
150 if (string[0] == '-' && string[1] == '\0')
151 break;
152
153 for (;;) {
154 flag = *string++;
155 if (flag == '\0')
156 break;
157 if (flag == '?') {
158 args_free(args);
159 return (NULL);
160 }
161 if (!isalnum(flag)) {
162 xasprintf(cause, "invalid flag -%c", flag);
163 args_free(args);
164 return (NULL);
165 }
166 found = strchr(parse->template, flag);
167 if (found == NULL) {
168 xasprintf(cause, "unknown flag -%c", flag);
169 args_free(args);
170 return (NULL);
171 }
172 argument = *++found;
173 if (argument != ':') {
174 log_debug("%s: -%c", __func__, flag);
175 args_set(args, flag, NULL);
176 continue;
177 }
178 new = xcalloc(1, sizeof *new);
179 if (*string != '\0') {
180 new->type = ARGS_STRING;
181 new->string = xstrdup(string);
182 } else {
183 if (i == count) {
184 xasprintf(cause,
185 "-%c expects an argument",
186 flag);
187 args_free(args);
188 return (NULL);
189 }
190 if (values[i].type != ARGS_STRING) {
191 xasprintf(cause,
192 "-%c argument must be a string",
193 flag);
194 args_free(args);
195 return (NULL);
196 }
197 args_copy_value(new, &values[i++]);
198 }
199 s = args_value_as_string(new);
200 log_debug("%s: -%c = %s", __func__, flag, s);
201 args_set(args, flag, new);
202 break;
203 }
204 }
205 log_debug("%s: flags end at %u of %u", __func__, i, count);
206 if (i != count) {
207 for (/* nothing */; i < count; i++) {
208 value = &values[i];
209
210 s = args_value_as_string(value);
211 log_debug("%s: %u = %s (type %d)", __func__, i, s,
212 value->type);
213
214 if (parse->cb != NULL) {
215 type = parse->cb(args, args->count, cause);
216 if (type == ARGS_PARSE_INVALID) {
217 args_free(args);
218 return (NULL);
219 }
220 } else
221 type = ARGS_PARSE_STRING;
222
223 args->values = xrecallocarray(args->values,
224 args->count, args->count + 1, sizeof *args->values);
225 new = &args->values[args->count++];
226
227 switch (type) {
228 case ARGS_PARSE_INVALID:
229 fatalx("unexpected argument type");
230 case ARGS_PARSE_STRING:
231 if (value->type != ARGS_STRING) {
232 xasprintf(cause,
233 "argument %u must be \"string\"",
234 args->count);
235 args_free(args);
236 return (NULL);
237 }
238 args_copy_value(new, value);
239 break;
240 case ARGS_PARSE_COMMANDS_OR_STRING:
241 args_copy_value(new, value);
242 break;
243 case ARGS_PARSE_COMMANDS:
244 if (value->type != ARGS_COMMANDS) {
245 xasprintf(cause,
246 "argument %u must be { commands }",
247 args->count);
248 args_free(args);
249 return (NULL);
250 }
251 args_copy_value(new, value);
252 break;
253 }
254 }
255 }
256
257 if (parse->lower != -1 && args->count < (u_int)parse->lower) {
258 xasprintf(cause,
259 "too few arguments (need at least %u)",
260 parse->lower);
261 args_free(args);
262 return (NULL);
263 }
264 if (parse->upper != -1 && args->count > (u_int)parse->upper) {
265 xasprintf(cause,
266 "too many arguments (need at most %u)",
267 parse->upper);
268 args_free(args);
269 return (NULL);
270 }
271 return (args);
272 }
273
274 /* Copy and expand a value. */
275 static void
276 args_copy_copy_value(struct args_value *to, struct args_value *from, int argc,
277 char **argv)
278 {
279 char *s, *expanded;
280 int i;
281
282 to->type = from->type;
283 switch (from->type) {
284 case ARGS_NONE:
285 break;
286 case ARGS_STRING:
287 expanded = xstrdup(from->string);
288 for (i = 0; i < argc; i++) {
289 s = cmd_template_replace(expanded, argv[i], i + 1);
290 free(expanded);
291 expanded = s;
292 }
293 to->string = expanded;
294 break;
295 case ARGS_COMMANDS:
296 to->cmdlist = cmd_list_copy(from->cmdlist, argc, argv);
297 break;
298 }
299 }
300
301 /* Copy an arguments set. */
302 struct args *
303 args_copy(struct args *args, int argc, char **argv)
304 {
305 struct args *new_args;
306 struct args_entry *entry;
307 struct args_value *value, *new_value;
308 u_int i;
309
310 cmd_log_argv(argc, argv, "%s", __func__);
311
312 new_args = args_create();
313 RB_FOREACH(entry, args_tree, &args->tree) {
314 if (TAILQ_EMPTY(&entry->values)) {
315 for (i = 0; i < entry->count; i++)
316 args_set(new_args, entry->flag, NULL);
317 continue;
318 }
319 TAILQ_FOREACH(value, &entry->values, entry) {
320 new_value = xcalloc(1, sizeof *new_value);
321 args_copy_copy_value(new_value, value, argc, argv);
322 args_set(new_args, entry->flag, new_value);
323 }
324 }
325 if (args->count == 0)
326 return (new_args);
327 new_args->count = args->count;
328 new_args->values = xcalloc(args->count, sizeof *new_args->values);
329 for (i = 0; i < args->count; i++) {
330 new_value = &new_args->values[i];
331 args_copy_copy_value(new_value, &args->values[i], argc, argv);
332 }
333 return (new_args);
334 }
335
336 /* Free a value. */
337 void
338 args_free_value(struct args_value *value)
339 {
340 switch (value->type) {
341 case ARGS_NONE:
342 break;
343 case ARGS_STRING:
344 free(value->string);
345 break;
346 case ARGS_COMMANDS:
347 cmd_list_free(value->cmdlist);
348 break;
349 }
350 free(value->cached);
351 }
352
353 /* Free values. */
354 void
355 args_free_values(struct args_value *values, u_int count)
356 {
357 u_int i;
358
359 for (i = 0; i < count; i++)
360 args_free_value(&values[i]);
361 }
362
363 /* Free an arguments set. */
364 void
365 args_free(struct args *args)
366 {
367 struct args_entry *entry;
368 struct args_entry *entry1;
369 struct args_value *value;
370 struct args_value *value1;
371
372 args_free_values(args->values, args->count);
373 free(args->values);
374
375 RB_FOREACH_SAFE(entry, args_tree, &args->tree, entry1) {
376 RB_REMOVE(args_tree, &args->tree, entry);
377 TAILQ_FOREACH_SAFE(value, &entry->values, entry, value1) {
378 TAILQ_REMOVE(&entry->values, value, entry);
379 args_free_value(value);
380 free(value);
381 }
382 free(entry);
383 }
384
385 free(args);
386 }
387
388 /* Convert arguments to vector. */
389 void
390 args_to_vector(struct args *args, int *argc, char ***argv)
391 {
392 char *s;
393 u_int i;
394
395 *argc = 0;
396 *argv = NULL;
397
398 for (i = 0; i < args->count; i++) {
399 switch (args->values[i].type) {
400 case ARGS_NONE:
401 break;
402 case ARGS_STRING:
403 cmd_append_argv(argc, argv, args->values[i].string);
404 break;
405 case ARGS_COMMANDS:
406 s = cmd_list_print(args->values[i].cmdlist, 0);
407 cmd_append_argv(argc, argv, s);
408 free(s);
409 break;
410 }
411 }
412 }
413
414 /* Convert arguments from vector. */
415 struct args_value *
416 args_from_vector(int argc, char **argv)
417 {
418 struct args_value *values;
419 int i;
420
421 values = xcalloc(argc, sizeof *values);
422 for (i = 0; i < argc; i++) {
423 values[i].type = ARGS_STRING;
424 values[i].string = xstrdup(argv[i]);
425 }
426 return (values);
427 }
428
429 /* Add to string. */
430 static void printflike(3, 4)
431 args_print_add(char **buf, size_t *len, const char *fmt, ...)
432 {
433 va_list ap;
434 char *s;
435 size_t slen;
436
437 va_start(ap, fmt);
438 slen = xvasprintf(&s, fmt, ap);
439 va_end(ap);
440
441 *len += slen;
442 *buf = xrealloc(*buf, *len);
443
444 strlcat(*buf, s, *len);
445 free(s);
446 }
447
448 /* Add value to string. */
449 static void
450 args_print_add_value(char **buf, size_t *len, struct args_value *value)
451 {
452 char *expanded = NULL;
453
454 if (**buf != '\0')
455 args_print_add(buf, len, " ");
456
457 switch (value->type) {
458 case ARGS_NONE:
459 break;
460 case ARGS_COMMANDS:
461 expanded = cmd_list_print(value->cmdlist, 0);
462 args_print_add(buf, len, "{ %s }", expanded);
463 break;
464 case ARGS_STRING:
465 expanded = args_escape(value->string);
466 args_print_add(buf, len, "%s", expanded);
467 break;
468 }
469 free(expanded);
470 }
471
472 /* Print a set of arguments. */
473 char *
474 args_print(struct args *args)
475 {
476 size_t len;
477 char *buf;
478 u_int i, j;
479 struct args_entry *entry;
480 struct args_value *value;
481
482 len = 1;
483 buf = xcalloc(1, len);
484
485 /* Process the flags first. */
486 RB_FOREACH(entry, args_tree, &args->tree) {
487 if (!TAILQ_EMPTY(&entry->values))
488 continue;
489
490 if (*buf == '\0')
491 args_print_add(&buf, &len, "-");
492 for (j = 0; j < entry->count; j++)
493 args_print_add(&buf, &len, "%c", entry->flag);
494 }
495
496 /* Then the flags with arguments. */
497 RB_FOREACH(entry, args_tree, &args->tree) {
498 TAILQ_FOREACH(value, &entry->values, entry) {
499 if (*buf != '\0')
500 args_print_add(&buf, &len, " -%c", entry->flag);
501 else
502 args_print_add(&buf, &len, "-%c", entry->flag);
503 args_print_add_value(&buf, &len, value);
504 }
505 }
506
507 /* And finally the argument vector. */
508 for (i = 0; i < args->count; i++)
509 args_print_add_value(&buf, &len, &args->values[i]);
510
511 return (buf);
512 }
513
514 /* Escape an argument. */
515 char *
516 args_escape(const char *s)
517 {
518 static const char dquoted[] = " #';${}%";
519 static const char squoted[] = " \"";
520 char *escaped, *result;
521 int flags, quotes = 0;
522
523 if (*s == '\0') {
524 xasprintf(&result, "''");
525 return (result);
526 }
527 if (s[strcspn(s, dquoted)] != '\0')
528 quotes = '"';
529 else if (s[strcspn(s, squoted)] != '\0')
530 quotes = '\'';
531
532 if (s[0] != ' ' &&
533 s[1] == '\0' &&
534 (quotes != 0 || s[0] == '~')) {
535 xasprintf(&escaped, "\\%c", s[0]);
536 return (escaped);
537 }
538
539 flags = VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL;
540 if (quotes == '"')
541 flags |= VIS_DQ;
542 utf8_stravis(&escaped, s, flags);
543
544 if (quotes == '\'')
545 xasprintf(&result, "'%s'", escaped);
546 else if (quotes == '"') {
547 if (*escaped == '~')
548 xasprintf(&result, "\"\\%s\"", escaped);
549 else
550 xasprintf(&result, "\"%s\"", escaped);
551 } else {
552 if (*escaped == '~')
553 xasprintf(&result, "\\%s", escaped);
554 else
555 result = xstrdup(escaped);
556 }
557 free(escaped);
558 return (result);
559 }
560
561 /* Return if an argument is present. */
562 int
563 args_has(struct args *args, u_char flag)
564 {
565 struct args_entry *entry;
566
567 entry = args_find(args, flag);
568 if (entry == NULL)
569 return (0);
570 return (entry->count);
571 }
572
573 /* Set argument value in the arguments tree. */
574 void
575 args_set(struct args *args, u_char flag, struct args_value *value)
576 {
577 struct args_entry *entry;
578
579 entry = args_find(args, flag);
580 if (entry == NULL) {
581 entry = xcalloc(1, sizeof *entry);
582 entry->flag = flag;
583 entry->count = 1;
584 TAILQ_INIT(&entry->values);
585 RB_INSERT(args_tree, &args->tree, entry);
586 } else
587 entry->count++;
588 if (value != NULL && value->type != ARGS_NONE)
589 TAILQ_INSERT_TAIL(&entry->values, value, entry);
590 }
591
592 /* Get argument value. Will be NULL if it isn't present. */
593 const char *
594 args_get(struct args *args, u_char flag)
595 {
596 struct args_entry *entry;
597
598 if ((entry = args_find(args, flag)) == NULL)
599 return (NULL);
600 if (TAILQ_EMPTY(&entry->values))
601 return (NULL);
602 return (TAILQ_LAST(&entry->values, args_values)->string);
603 }
604
605 /* Get first argument. */
606 u_char
607 args_first(struct args *args, struct args_entry **entry)
608 {
609 *entry = RB_MIN(args_tree, &args->tree);
610 if (*entry == NULL)
611 return (0);
612 return ((*entry)->flag);
613 }
614
615 /* Get next argument. */
616 u_char
617 args_next(struct args_entry **entry)
618 {
619 *entry = RB_NEXT(args_tree, &args->tree, *entry);
620 if (*entry == NULL)
621 return (0);
622 return ((*entry)->flag);
623 }
624
625 /* Get argument count. */
626 u_int
627 args_count(struct args *args)
628 {
629 return (args->count);
630 }
631
632 /* Get argument values. */
633 struct args_value *
634 args_values(struct args *args)
635 {
636 return (args->values);
637 }
638
639 /* Get argument value. */
640 struct args_value *
641 args_value(struct args *args, u_int idx)
642 {
643 if (idx >= args->count)
644 return (NULL);
645 return (&args->values[idx]);
646 }
647
648 /* Return argument as string. */
649 const char *
650 args_string(struct args *args, u_int idx)
651 {
652 if (idx >= args->count)
653 return (NULL);
654 return (args_value_as_string(&args->values[idx]));
655 }
656
657 /* Make a command now. */
658 struct cmd_list *
659 args_make_commands_now(struct cmd *self, struct cmdq_item *item, u_int idx,
660 int expand)
661 {
662 struct args_command_state *state;
663 char *error;
664 struct cmd_list *cmdlist;
665
666 state = args_make_commands_prepare(self, item, idx, NULL, 0, expand);
667 cmdlist = args_make_commands(state, 0, NULL, &error);
668 if (cmdlist == NULL) {
669 cmdq_error(item, "%s", error);
670 free(error);
671 }
672 else
673 cmdlist->references++;
674 args_make_commands_free(state);
675 return (cmdlist);
676 }
677
678 /* Save bits to make a command later. */
679 struct args_command_state *
680 args_make_commands_prepare(struct cmd *self, struct cmdq_item *item, u_int idx,
681 const char *default_command, int wait, int expand)
682 {
683 struct args *args = cmd_get_args(self);
684 struct cmd_find_state *target = cmdq_get_target(item);
685 struct client *tc = cmdq_get_target_client(item);
686 struct args_value *value;
687 struct args_command_state *state;
688 const char *cmd;
689
690 state = xcalloc(1, sizeof *state);
691
692 if (idx < args->count) {
693 value = &args->values[idx];
694 if (value->type == ARGS_COMMANDS) {
695 state->cmdlist = value->cmdlist;
696 state->cmdlist->references++;
697 return (state);
698 }
699 cmd = value->string;
700 } else {
701 if (default_command == NULL)
702 fatalx("argument out of range");
703 cmd = default_command;
704 }
705
706
707 if (expand)
708 state->cmd = format_single_from_target(item, cmd);
709 else
710 state->cmd = xstrdup(cmd);
711 log_debug("%s: %s", __func__, state->cmd);
712
713 if (wait)
714 state->pi.item = item;
715 cmd_get_source(self, &state->pi.file, &state->pi.line);
716 state->pi.c = tc;
717 if (state->pi.c != NULL)
718 state->pi.c->references++;
719 cmd_find_copy_state(&state->pi.fs, target);
720
721 return (state);
722 }
723
724 /* Return argument as command. */
725 struct cmd_list *
726 args_make_commands(struct args_command_state *state, int argc, char **argv,
727 char **error)
728 {
729 struct cmd_parse_result *pr;
730 char *cmd, *new_cmd;
731 int i;
732
733 if (state->cmdlist != NULL) {
734 if (argc == 0)
735 return (state->cmdlist);
736 return (cmd_list_copy(state->cmdlist, argc, argv));
737 }
738
739 cmd = xstrdup(state->cmd);
740 for (i = 0; i < argc; i++) {
741 new_cmd = cmd_template_replace(cmd, argv[i], i + 1);
742 log_debug("%s: %%%u %s: %s", __func__, i + 1, argv[i], new_cmd);
743 free(cmd);
744 cmd = new_cmd;
745 }
746 log_debug("%s: %s", __func__, cmd);
747
748 pr = cmd_parse_from_string(cmd, &state->pi);
749 free(cmd);
750 switch (pr->status) {
751 case CMD_PARSE_ERROR:
752 *error = pr->error;
753 return (NULL);
754 case CMD_PARSE_SUCCESS:
755 return (pr->cmdlist);
756 }
757 fatalx("invalid parse return state");
758 }
759
760 /* Free commands state. */
761 void
762 args_make_commands_free(struct args_command_state *state)
763 {
764 if (state->cmdlist != NULL)
765 cmd_list_free(state->cmdlist);
766 if (state->pi.c != NULL)
767 server_client_unref(state->pi.c);
768 free(state->cmd);
769 free(state);
770 }
771
772 /* Get prepared command. */
773 char *
774 args_make_commands_get_command(struct args_command_state *state)
775 {
776 struct cmd *first;
777 int n;
778 char *s;
779
780 if (state->cmdlist != NULL) {
781 first = cmd_list_first(state->cmdlist);
782 if (first == NULL)
783 return (xstrdup(""));
784 return (xstrdup(cmd_get_entry(first)->name));
785 }
786 n = strcspn(state->cmd, " ,");
787 xasprintf(&s, "%.*s", n, state->cmd);
788 return (s);
789 }
790
791 /* Get first value in argument. */
792 struct args_value *
793 args_first_value(struct args *args, u_char flag)
794 {
795 struct args_entry *entry;
796
797 if ((entry = args_find(args, flag)) == NULL)
798 return (NULL);
799 return (TAILQ_FIRST(&entry->values));
800 }
801
802 /* Get next value in argument. */
803 struct args_value *
804 args_next_value(struct args_value *value)
805 {
806 return (TAILQ_NEXT(value, entry));
807 }
808
809 /* Convert an argument value to a number. */
810 long long
811 args_strtonum(struct args *args, u_char flag, long long minval,
812 long long maxval, char **cause)
813 {
814 const char *errstr;
815 long long ll;
816 struct args_entry *entry;
817 struct args_value *value;
818
819 if ((entry = args_find(args, flag)) == NULL) {
820 *cause = xstrdup("missing");
821 return (0);
822 }
823 value = TAILQ_LAST(&entry->values, args_values);
824
825 ll = strtonum(value->string, minval, maxval, &errstr);
826 if (errstr != NULL) {
827 *cause = xstrdup(errstr);
828 return (0);
829 }
830
831 *cause = NULL;
832 return (ll);
833 }
834
835 /* Convert an argument to a number which may be a percentage. */
836 long long
837 args_percentage(struct args *args, u_char flag, long long minval,
838 long long maxval, long long curval, char **cause)
839 {
840 const char *value;
841 struct args_entry *entry;
842
843 if ((entry = args_find(args, flag)) == NULL) {
844 *cause = xstrdup("missing");
845 return (0);
846 }
847 value = TAILQ_LAST(&entry->values, args_values)->string;
848 return (args_string_percentage(value, minval, maxval, curval, cause));
849 }
850
851 /* Convert a string to a number which may be a percentage. */
852 long long
853 args_string_percentage(const char *value, long long minval, long long maxval,
854 long long curval, char **cause)
855 {
856 const char *errstr;
857 long long ll;
858 size_t valuelen = strlen(value);
859 char *copy;
860
861 if (value[valuelen - 1] == '%') {
862 copy = xstrdup(value);
863 copy[valuelen - 1] = '\0';
864
865 ll = strtonum(copy, 0, 100, &errstr);
866 free(copy);
867 if (errstr != NULL) {
868 *cause = xstrdup(errstr);
869 return (0);
870 }
871 ll = (curval * ll) / 100;
872 if (ll < minval) {
873 *cause = xstrdup("too small");
874 return (0);
875 }
876 if (ll > maxval) {
877 *cause = xstrdup("too large");
878 return (0);
879 }
880 } else {
881 ll = strtonum(value, minval, maxval, &errstr);
882 if (errstr != NULL) {
883 *cause = xstrdup(errstr);
884 return (0);
885 }
886 }
887
888 *cause = NULL;
889 return (ll);
890 }