source: code/icb.c@ d8c3967

Last change on this file since d8c3967 was d8c3967, checked in by Mike Belopuhov <mike@…>, 8 years ago

Fix off-by-one in icb_sendfmt
  • Property mode set to 100644
File size: 18.2 KB
Line 
1/*
2 * Copyright (c) 2009, 2010, 2013, 2014 Mike Belopuhov
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <sys/types.h>
18#include <sys/queue.h>
19#include <netdb.h>
20#include <stdarg.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <syslog.h>
25#include <unistd.h>
26#include <ctype.h>
27#include <event.h>
28#include <vis.h>
29
30#include "icb.h"
31#include "icbd.h"
32
33struct icb_grplist groups;
34
35extern int creategroups;
36extern char srvname[NI_MAXHOST];
37
38void icb_command(struct icb_session *, char *, char *);
39void icb_groupmsg(struct icb_session *, char *);
40int icb_login(struct icb_session *, char *, char *, char *);
41int icb_dowho(struct icb_session *, struct icb_group *);
42
43/*
44 * icb_init: initialize server name and a list of groups
45 */
46void
47icb_init(void)
48{
49 LIST_INIT(&groups);
50
51 if (strlen(srvname) == 0)
52 (void)gethostname(srvname, sizeof srvname);
53 /*
54 * NI_MAXHOST is usually greater than what we
55 * can actually send, hence truncation:
56 */
57 if (strlen(srvname) > 200)
58 srvname[200] = '\0';
59}
60
61/*
62 * icb_start: called upon accepting a new connection, greets new client
63 */
64void
65icb_start(struct icb_session *is)
66{
67 icb_sendfmt(is, "%c%c%c%s%c%s", ICB_M_PROTO, '1', ICB_M_SEP, srvname,
68 ICB_M_SEP, "icbd");
69 SETF(is->flags, ICB_SF_PROTOSENT);
70}
71
72/*
73 * icb_input: main input processing routine
74 */
75int
76icb_input(struct icb_session *is)
77{
78 char *msg = is->buffer;
79 int msglen = is->length;
80 unsigned char type;
81 char *wptr = NULL;
82 int res = 0;
83
84 is->last = getmonotime();
85 type = msg[0];
86 msg++;
87 if (!ISSETF(is->flags, ICB_SF_LOGGEDIN) && type != ICB_M_LOGIN) {
88 icb_error(is, "Not logged in");
89 return (0);
90 }
91 switch (type) {
92 case ICB_M_LOGIN: {
93 char client[ICB_MAXNICKLEN];
94 char nick[ICB_MAXNICKLEN];
95 char group[ICB_MAXGRPLEN];
96 char cmd[ICB_MAXCMDLEN];
97
98 memset(client, 0, sizeof client);
99 if (icb_token(msg, msglen, &wptr, client, ICB_MAXNICKLEN,
100 ICB_M_SEP, 1) < 0) {
101 icb_error(is, "Invalid client");
102 icbd_drop(is, NULL);
103 return (1);
104 }
105 memset(nick, 0, sizeof nick);
106 if (icb_token(msg, msglen, &wptr, nick, ICB_MAXNICKLEN,
107 ICB_M_SEP, 1) <= 0) {
108 icb_error(is, "Invalid nick");
109 icbd_drop(is, NULL);
110 return (1);
111 }
112 memset(group, 0, sizeof group);
113 if (icb_token(msg, msglen, &wptr, group, ICB_MAXGRPLEN,
114 ICB_M_SEP, 1) < 0) {
115 icb_error(is, "Invalid login group");
116 icbd_drop(is, NULL);
117 return (1);
118 }
119 memset(cmd, 0, sizeof cmd);
120 if (icb_token(msg, msglen, &wptr, cmd, ICB_MAXCMDLEN,
121 ICB_M_SEP, 1) < 0) {
122 icb_error(is, "Invalid command");
123 icbd_drop(is, NULL);
124 return (1);
125 }
126 if (strlen(cmd) > 0 && cmd[0] == 'w') {
127 icb_error(is, "Command not implemented");
128 icbd_drop(is, NULL);
129 return (1);
130 }
131 if (strlen(cmd) == 0 || strcmp(cmd, "login") != 0) {
132 icb_error(is, "Malformed login packet");
133 icbd_drop(is, NULL);
134 return (1);
135 }
136 res = icb_login(is, group, nick, client);
137 break;
138 }
139 case ICB_M_OPEN: {
140 icb_groupmsg(is, msg);
141 break;
142 }
143 case ICB_M_COMMAND: {
144 char cmd[ICB_MAXCMDLEN];
145
146 memset(cmd, 0, sizeof cmd);
147 if (icb_token(msg, msglen, &wptr, cmd, ICB_MAXCMDLEN,
148 ICB_M_SEP, 1) <= 0) {
149 icb_error(is, "Invalid command");
150 icbd_drop(is, NULL);
151 return (1);
152 }
153 msg = wptr;
154 icb_command(is, cmd, msg);
155 break;
156 }
157 case ICB_M_PONG: {
158 icb_sendfmt(is, "%c", ICB_M_PING);
159 break;
160 }
161 case ICB_M_PROTO:
162 case ICB_M_NOOP:
163 /* ignore */
164 break;
165 default:
166 /* everything else is not valid */
167 icb_error(is, "Undefined message type %u", type);
168 }
169 return (res);
170}
171
172/*
173 * icb_login: handles login ('a') packets
174 */
175int
176icb_login(struct icb_session *is, char *grp, char *nick, char *client)
177{
178 const char *defgrp = "1";
179 struct icb_group *ig;
180 struct icb_session *s;
181 char group[ICB_MAXGRPLEN];
182
183 if (!nick || strlen(nick) == 0 ||
184 icb_vis(is->nick, nick, ICB_MAXNICKLEN, VIS_SP)) {
185 icb_error(is, "Invalid nick");
186 icbd_drop(is, NULL);
187 return (1);
188 }
189 if (!grp || strlen(grp) == 0)
190 strlcpy(group, defgrp, ICB_MAXGRPLEN);
191 else
192 icb_vis(group, grp, ICB_MAXGRPLEN, VIS_SP);
193 LIST_FOREACH(ig, &groups, entry) {
194 if (strcmp(ig->name, group) == 0)
195 break;
196 }
197 if (ig == NULL) {
198 if (!creategroups) {
199 icb_error(is, "Can't create new groups", group);
200 icbd_drop(is, NULL);
201 return (1);
202 } else {
203 if ((ig = icb_addgroup(is, group)) == NULL) {
204 icb_error(is, "Can't create group %s", group);
205 return (0);
206 }
207 icbd_log(NULL, LOG_DEBUG, "%s created group %s",
208 is->nick, group);
209 }
210 }
211 LIST_FOREACH(s, &ig->sess, entry) {
212 if (strcmp(s->nick, is->nick) == 0) {
213 icb_error(is, "Nick is already in use");
214 icbd_drop(is, NULL);
215 return (1);
216 }
217 }
218
219 if (client && strlen(client) > 0)
220 icb_vis(is->client, client, sizeof is->client, VIS_SP);
221 else
222 strlcpy(is->client, is->nick, sizeof is->client);
223 is->group = ig;
224 is->login = time(NULL);
225 is->last = getmonotime();
226
227 /* notify group */
228 icb_status_group(ig, NULL, STATUS_SIGNON, "%s (%s@%s) entered group",
229 is->nick, is->client, is->host);
230
231 CLRF(is->flags, ICB_SF_PROTOSENT);
232 SETF(is->flags, ICB_SF_LOGGEDIN);
233
234 LIST_INSERT_HEAD(&ig->sess, is, entry);
235
236 /* acknowledge successful login */
237 icb_sendfmt(is, "%c", ICB_M_LOGIN);
238
239 /* notify user */
240 icb_status(is, STATUS_STATUS, "You are now in group %s%s", ig->name,
241 icb_ismod(ig, is) ? " as moderator" : "");
242
243 /* send user a topic name */
244 if (strlen(ig->topic) > 0)
245 icb_status(is, STATUS_TOPIC, "Topic for %s is \"%s\"",
246 ig->name, ig->topic);
247 return (0);
248}
249
250/*
251 * icb_groupmsg: handles open message ('b') packets
252 */
253void
254icb_groupmsg(struct icb_session *is, char *msg)
255{
256 char buf[ICB_MSGSIZE];
257 struct icb_group *ig = is->group;
258 struct icb_session *s;
259 int res, buflen;
260
261 if (strlen(msg) == 0) {
262 icb_error(is, "Empty message");
263 return;
264 }
265
266 do {
267 res = snprintf(&buf[1], sizeof buf - 1, "%c%s%c%s", ICB_M_OPEN,
268 is->nick, ICB_M_SEP, msg);
269 if (res < 0) {
270 icbd_log(is, LOG_ERR, "Format error in %s", __func__);
271 return;
272 }
273 /* res doesn't include the terminating NUL */
274 buflen = MIN((size_t)res + 1, sizeof buf - 1);
275 buf[0] = buflen;
276
277 logger(ig->name, is->nick, msg);
278
279 LIST_FOREACH(s, &ig->sess, entry) {
280 if (s == is)
281 continue;
282 icbd_send(s, buf, buflen + 1);
283 }
284
285 msg += buflen - 1;
286 } while (res > buflen - 1);
287}
288
289/*
290 * icb_privmsg: handles personal message ('c') packets
291 */
292void
293icb_privmsg(struct icb_session *is, char *to, char *msg)
294{
295 struct icb_group *ig = is->group;
296 struct icb_session *s;
297 char buf[ICB_MSGSIZE];
298 char whom[ICB_MAXNICKLEN];
299 int res, buflen;
300
301 icb_vis(whom, to, ICB_MAXNICKLEN, VIS_SP);
302
303 /* try home group first */
304 LIST_FOREACH(s, &ig->sess, entry) {
305 if (strcmp(s->nick, whom) == 0)
306 break;
307 }
308 if (!s) {
309 /* try all groups until the first match */
310 LIST_FOREACH(ig, &groups, entry) {
311 LIST_FOREACH(s, &ig->sess, entry) {
312 if (strcmp(s->nick, whom) == 0)
313 break;
314 }
315 if (s)
316 break;
317 }
318 if (!s) {
319 icb_error(is, "No such user %s", whom);
320 return;
321 }
322 }
323
324 do {
325 res = snprintf(&buf[1], sizeof buf - 1, "%c%s%c%s",
326 ICB_M_PERSONAL, is->nick, ICB_M_SEP, msg);
327 if (res < 0) {
328 icbd_log(is, LOG_ERR, "Format error in %s", __func__);
329 return;
330 }
331 /* res doesn't include the terminating NUL */
332 buflen = MIN((size_t)res + 1, sizeof buf - 1);
333 buf[0] = buflen;
334
335 icbd_send(s, buf, buflen + 1);
336
337 msg += buflen - 1;
338 } while (res > buflen - 1);
339}
340
341/*
342 * icb_command: handles command ('h') packets
343 */
344void
345icb_command(struct icb_session *is, char *cmd, char *arg)
346{
347 void (*handler)(struct icb_session *, char *);
348 char command[ICB_MAXCMDLEN];
349
350 icb_vis(command, cmd, sizeof command, VIS_SP);
351
352 if ((handler = icb_cmd_lookup(command)) == NULL) {
353 icb_error(is, "Unsupported command: %s", command);
354 return;
355 }
356 handler(is, arg);
357}
358
359/*
360 * icb_cmdout: sends out command output ('i') packets, called from the
361 * command handlers
362 */
363void
364icb_cmdout(struct icb_session *is, int type, char *outmsg)
365{
366 char *otype = NULL;
367
368 switch (type) {
369 case CMDOUT_CO:
370 otype = "co";
371 break;
372 case CMDOUT_EC:
373 otype = "ec";
374 break;
375 case CMDOUT_WG:
376 otype = "wg";
377 break;
378 case CMDOUT_WH:
379 otype = "wh";
380 break;
381 case CMDOUT_WL:
382 otype = "wl";
383 break;
384 default:
385 icbd_log(is, LOG_ERR, "unknown cmdout type %d", type);
386 return;
387 }
388 if (outmsg)
389 icb_sendfmt(is, "%c%s%c%s", ICB_M_CMDOUT, otype, ICB_M_SEP,
390 outmsg);
391 else
392 icb_sendfmt(is, "%c%s", ICB_M_CMDOUT, otype);
393}
394
395/*
396 * icb_status: sends a status message ('d') to the client
397 */
398void
399icb_status(struct icb_session *is, int type, const char *fmt, ...)
400{
401 va_list ap;
402 char buf[ICB_MSGSIZE];
403 int res, buflen = 1;
404 static const struct {
405 int type;
406 const char *msg;
407 } msgtab[] = {
408 { STATUS_ARRIVE, "Arrive" },
409 { STATUS_BOOT, "Boot" },
410 { STATUS_DEPART, "Depart" },
411 { STATUS_HELP, "Help" },
412 { STATUS_NAME, "Name" },
413 { STATUS_NOBEEP, "No-Beep" },
414 { STATUS_NOTIFY, "Notify" },
415 { STATUS_SIGNON, "Sign-on" },
416 { STATUS_SIGNOFF, "Sign-off" },
417 { STATUS_STATUS, "Status" },
418 { STATUS_TOPIC, "Topic" },
419 { STATUS_WARNING, "Warning" },
420 { 0, NULL }
421 };
422
423 if (type < 0 || type > (int)nitems(msgtab) - 1)
424 return;
425 res = snprintf(&buf[1], sizeof buf - 1, "%c%s%c", ICB_M_STATUS,
426 msgtab[type].msg, ICB_M_SEP);
427 if (res < 0) {
428 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
429 return;
430 }
431 buflen += MIN((size_t)res, sizeof buf - 1);
432 if ((size_t)buflen >= sizeof buf) {
433 icbd_log(NULL, LOG_ERR, "Status buffer too small");
434 return;
435 }
436 va_start(ap, fmt);
437 res = vsnprintf(&buf[buflen], sizeof buf - buflen, fmt, ap);
438 va_end(ap);
439 if (res < 0) {
440 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
441 return;
442 }
443 buflen += MIN((size_t)res, sizeof buf - buflen);
444 buf[0] = buflen;
445 icbd_send(is, buf, buflen + 1);
446}
447
448/*
449 * icb_status: sends a status message ('d') to the group except of the
450 * "ex" if it's not NULL
451 */
452void
453icb_status_group(struct icb_group *ig, struct icb_session *ex, int type,
454 const char *fmt, ...)
455{
456 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
457 va_list ap;
458 struct icb_session *s;
459
460 va_start(ap, fmt);
461 (void)vsnprintf(buf, sizeof buf, fmt, ap);
462 LIST_FOREACH(s, &ig->sess, entry) {
463 if (ex && s == ex)
464 continue;
465 icb_status(s, type, buf);
466 }
467 logger(ig->name, "", buf);
468 icbd_log(NULL, LOG_DEBUG, "%s", buf);
469 va_end(ap);
470}
471
472/*
473 * icb_error: sends an error message ('e') to the client
474 */
475void
476icb_error(struct icb_session *is, const char *fmt, ...)
477{
478 char buf[ICB_MSGSIZE];
479 va_list ap;
480 int res, buflen = 1;
481
482 va_start(ap, fmt);
483 res = vsnprintf(&buf[2], sizeof buf - 2, fmt, ap);
484 va_end(ap);
485 if (res < 0) {
486 icbd_log(NULL, LOG_ERR, "Format error");
487 return;
488 }
489 buflen += MIN((size_t)res, sizeof buf - 2);
490 buf[0] = ++buflen; /* account for ICB_M_ERROR */
491 buf[1] = ICB_M_ERROR;
492 icbd_send(is, buf, buflen + 1);
493 icbd_log(is, LOG_DEBUG, "%s", buf + 2);
494}
495
496/*
497 * icb_remove: removes a session from the associated group
498 */
499void
500icb_remove(struct icb_session *is, char *reason)
501{
502 if (is->group) {
503 if (icb_ismod(is->group, is))
504 (void)icb_pass(is->group, is, NULL);
505 LIST_REMOVE(is, entry);
506 if (reason)
507 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
508 "%s (%s@%s) just left: %s", is->nick, is->client,
509 is->host, reason);
510 else
511 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
512 "%s (%s@%s) just left", is->nick, is->client,
513 is->host);
514 is->group = NULL;
515 }
516}
517
518/*
519 * icb_addgroup: adds a new group to the list
520 */
521struct icb_group *
522icb_addgroup(struct icb_session *is, char *name)
523{
524 struct icb_group *ig;
525
526 if ((ig = calloc(1, sizeof *ig)) == NULL)
527 return (NULL);
528 strlcpy(ig->name, name, sizeof ig->name);
529 if (is)
530 ig->mod = is;
531 LIST_INIT(&ig->sess);
532 LIST_INSERT_HEAD(&groups, ig, entry);
533 return (ig);
534}
535
536#ifdef notused
537/*
538 * icb_delgroup: removes a group from the list
539 */
540void
541icb_delgroup(struct icb_group *ig)
542{
543 struct icb_session *s;
544
545 /* well, i guess we should kick out participants! ;-) */
546 LIST_FOREACH(s, &ig->sess, entry) {
547 icb_status(s, STATUS_WARNING, "Group dismissed");
548 s->group = NULL;
549 }
550 LIST_REMOVE(ig, entry);
551 bzero(ig, sizeof ig); /* paranoic thing, obviously */
552 free(ig);
553}
554#endif
555
556/*
557 * icb_dowho: a helper function that sends out a group header as a command
558 * output and user information in the "wl" format
559 */
560int
561icb_dowho(struct icb_session *is, struct icb_group *ig)
562{
563 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
564 struct icb_session *s;
565 time_t now;
566 int nusers = 0;
567
568 now = getmonotime();
569 icb_cmdout(is, CMDOUT_CO, " ");
570 snprintf(buf, sizeof buf, "Group: %-8s (%cvl) Mod: %-13s Topic: %s",
571 ig->name, ig->mod ? 'm' : 'p', ig->mod ? ig->mod->nick : "(None)",
572 strlen(ig->topic) > 0 ? ig->topic : "(None)");
573 icb_cmdout(is, CMDOUT_CO, buf);
574 LIST_FOREACH(s, &ig->sess, entry) {
575 (void)snprintf(buf, sizeof buf,
576 "%c%c%s%c%lld%c0%c%lld%c%s%c%s%c%s",
577 icb_ismod(ig, s) ? 'm' : ' ', ICB_M_SEP,
578 s->nick, ICB_M_SEP, now - s->last,
579 ICB_M_SEP, ICB_M_SEP, s->login, ICB_M_SEP,
580 s->client, ICB_M_SEP, s->host, ICB_M_SEP, " ");
581 icb_cmdout(is, CMDOUT_WL, buf);
582 nusers++;
583 }
584 return (nusers);
585}
586
587/*
588 * icb_who: sends a list of users of either the specified group or all
589 * groups found on the server
590 */
591void
592icb_who(struct icb_session *is, struct icb_group *ig)
593{
594 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
595 struct icb_group *g;
596
597 if (!ig) {
598 int nusers = 0, ngroups = 0;
599
600 LIST_FOREACH(g, &groups, entry) {
601 nusers += icb_dowho(is, g);
602 ngroups++;
603 }
604 if (nusers > 0) {
605 (void)snprintf(buf, sizeof buf,
606 "Total: %d %s in %d %s",
607 nusers, nusers > 1 ? "users" : "user",
608 ngroups, ngroups > 1 ? "groups" : "group");
609 } else
610 (void)snprintf(buf, sizeof buf, "No users found.");
611 icb_cmdout(is, CMDOUT_CO, buf);
612 } else
613 (void)icb_dowho(is, ig);
614}
615
616/*
617 * icb_ismod: checks whether group is moderated by "is"
618 */
619int
620icb_ismod(struct icb_group *ig, struct icb_session *is)
621{
622 return (ig->mod == is);
623}
624
625/*
626 * icb_modpermit: checks user against the moderators table if it has
627 * been populated
628 */
629int
630icb_modpermit(struct icb_session *is, int enforce)
631{
632 extern char modtab[ICB_MTABLEN][ICB_MAXNICKLEN];
633 extern int modtabcnt;
634
635 icbd_modupdate();
636 if ((enforce ? 0 : modtabcnt == 0) ||
637 bsearch(is->nick, modtab, modtabcnt, ICB_MAXNICKLEN,
638 (int (*)(const void *, const void *))strcmp))
639 return (1);
640 return (0);
641}
642
643/*
644 * icb_pass: passes moderation of group "ig" from "from" to "to",
645 * returns -1 if "from" is not a moderator, 1 if passed
646 * to "to" and 0 otherwise (no moderator or passed to the
647 * internal bot)
648 */
649int
650icb_pass(struct icb_group *ig, struct icb_session *from,
651 struct icb_session *to)
652{
653 if (ig->mod && ig->mod != from)
654 return (-1);
655 if (!from && !to)
656 return (-1);
657 ig->mod = to;
658 if (to)
659 icb_status(to, STATUS_NOTIFY, "%s just passed you moderation"
660 " of %s", from ? from->nick : "server", ig->name);
661 icb_status_group(ig, to, STATUS_NOTIFY, "%s has passed moderation "
662 "to %s", from ? from->nick : "server", to ? to->nick : "server");
663 return (1);
664}
665
666/*
667 * icb_sendfmt: formats a string and sends it over
668 */
669void
670icb_sendfmt(struct icb_session *is, const char *fmt, ...)
671{
672 char buf[ICB_MSGSIZE];
673 va_list ap;
674 int res, buflen;
675
676 va_start(ap, fmt);
677 res = vsnprintf(&buf[1], sizeof buf - 1, fmt, ap);
678 va_end(ap);
679 if (res < 0) {
680 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
681 return;
682 }
683 buflen = MIN((size_t)res + 1, sizeof buf - 1);
684 buf[0] = buflen;
685 icbd_send(is, buf, buflen + 1);
686}
687
688/*
689 * icb_token: copies a sequence of characters delimited by the 'sep' character
690 * from the source buffer 'buf' at offset indicated by 'bufptr' to
691 * the destination buffer 'dst' and sets 'bufptr' to the next byte
692 * after 'sep'.
693 */
694int
695icb_token(char *buf, int len, char **bufptr, char *dst, int dstlen, int sep,
696 int trim)
697{
698 char *start;
699 int i, ret;
700
701 if (buf == NULL || len <= 0 || dst == NULL || dstlen <= 0)
702 return (0);
703 if (*bufptr == NULL)
704 *bufptr = buf;
705 start = *bufptr;
706 for (i = *bufptr - buf; i < len; i++, (*bufptr)++) {
707 if (**bufptr == sep || **bufptr == '\0') {
708 /* copy and null terminate the token */
709 ret = strlcpy(dst, start,
710 MIN(*bufptr - start + 1, dstlen));
711 if (**bufptr != '\0')
712 (*bufptr)++;
713 if (ret > 0 && trim)
714 ret = icb_trim(dst, dstlen);
715 return (ret);
716 }
717 }
718 /*
719 * Reached the end of the buffer without finding a field separator
720 * nor the end of line character. If we have advanced our pointer
721 * we should copy the resulting single field out.
722 */
723 if (*bufptr - start > 0) {
724 ret = strlcpy(dst, start, MIN(*bufptr - start + 1, dstlen));
725 if (ret > 0 && trim)
726 ret = icb_trim(dst, dstlen);
727 return (ret);
728 }
729 return (0);
730}
731
732/*
733 * icb_trim: trims trailing whitespace
734 */
735int
736icb_trim(char *buf, int len)
737{
738 char *p = buf;
739 int i;
740
741 for (i = 0; i < len && *p != '\0'; i++)
742 p++;
743 if (*p == '\0' && p - buf > 0)
744 p--;
745 while (p >= buf && isspace(*p)) {
746 *p = '\0';
747 i--;
748 if (p > buf)
749 p--;
750 }
751 return (i);
752}
753
754/*
755 * icb_vis: strnvis-like function that escapes percentages as well
756 */
757int
758icb_vis(char *dst, const char *src, size_t dstsize, int flags)
759{
760 int si, di, td;
761
762 for (si = 0, di = 0; (size_t)di < dstsize - 1 && src[si] != '\0';
763 si++, di++) {
764 if (src[si] == '%') {
765 if ((size_t)di + 1 >= dstsize - 1)
766 break;
767 dst[di++] = '%';
768 dst[di] = '%';
769 } else if (src[si] == ' ' && flags & VIS_SP)
770 dst[di] = '_';
771 else if (isgraph(src[si]) || src[si] == ' ')
772 dst[di] = src[si];
773 else {
774 td = snprintf(&dst[di], dstsize - di,
775 "\\%03o", (unsigned char)src[si]);
776 if (td == -1 || (size_t)td >= dstsize - di)
777 break;
778 di += td - 1;
779 }
780 }
781 dst[MIN((size_t)di, dstsize - 1)] = '\0';
782 return (0);
783}
Note: See TracBrowser for help on using the repository browser.