source: code/icb.c@ 6f076e7

Last change on this file since 6f076e7 was b8da4b3, checked in by Mike Belopuhov <mike@…>, 10 years ago

Callbacks are long gone
  • Property mode set to 100644
File size: 17.7 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 = 1;
260
261 if (strlen(msg) == 0) {
262 icb_error(is, "Empty message");
263 return;
264 }
265
266 res = snprintf(&buf[1], sizeof buf - 1, "%c%s%c%s", ICB_M_OPEN,
267 is->nick, ICB_M_SEP, msg);
268 if (res < 0) {
269 icb_error(is, "Format error");
270 return;
271 }
272 buflen += MIN((size_t)res, sizeof buf - 1);
273 buf[0] = buflen;
274
275 logger(ig->name, is->nick, msg);
276
277 LIST_FOREACH(s, &ig->sess, entry) {
278 if (s == is)
279 continue;
280 icbd_send(s, buf, buflen + 1);
281 }
282}
283
284/*
285 * icb_privmsg: handles personal message ('c') packets
286 */
287void
288icb_privmsg(struct icb_session *is, char *to, char *msg)
289{
290 struct icb_group *ig = is->group;
291 struct icb_session *s;
292 char whom[ICB_MAXNICKLEN];
293
294 icb_vis(whom, to, ICB_MAXNICKLEN, VIS_SP);
295
296 /* try home group first */
297 LIST_FOREACH(s, &ig->sess, entry) {
298 if (strcmp(s->nick, whom) == 0)
299 break;
300 }
301 if (!s) {
302 /* try all groups until the first match */
303 LIST_FOREACH(ig, &groups, entry) {
304 LIST_FOREACH(s, &ig->sess, entry) {
305 if (strcmp(s->nick, whom) == 0)
306 break;
307 }
308 if (s)
309 break;
310 }
311 if (!s) {
312 icb_error(is, "No such user %s", whom);
313 return;
314 }
315 }
316 icb_sendfmt(s, "%c%s%c%s", ICB_M_PERSONAL, is->nick, ICB_M_SEP, msg);
317}
318
319/*
320 * icb_command: handles command ('h') packets
321 */
322void
323icb_command(struct icb_session *is, char *cmd, char *arg)
324{
325 void (*handler)(struct icb_session *, char *);
326 char command[ICB_MAXCMDLEN];
327
328 icb_vis(command, cmd, sizeof command, VIS_SP);
329
330 if ((handler = icb_cmd_lookup(command)) == NULL) {
331 icb_error(is, "Unsupported command: %s", command);
332 return;
333 }
334 handler(is, arg);
335}
336
337/*
338 * icb_cmdout: sends out command output ('i') packets, called from the
339 * command handlers
340 */
341void
342icb_cmdout(struct icb_session *is, int type, char *outmsg)
343{
344 char *otype = NULL;
345
346 switch (type) {
347 case CMDOUT_CO:
348 otype = "co";
349 break;
350 case CMDOUT_EC:
351 otype = "ec";
352 break;
353 case CMDOUT_WG:
354 otype = "wg";
355 break;
356 case CMDOUT_WH:
357 otype = "wh";
358 break;
359 case CMDOUT_WL:
360 otype = "wl";
361 break;
362 default:
363 icbd_log(is, LOG_ERR, "unknown cmdout type %d", type);
364 return;
365 }
366 if (outmsg)
367 icb_sendfmt(is, "%c%s%c%s", ICB_M_CMDOUT, otype, ICB_M_SEP,
368 outmsg);
369 else
370 icb_sendfmt(is, "%c%s", ICB_M_CMDOUT, otype);
371}
372
373/*
374 * icb_status: sends a status message ('d') to the client
375 */
376void
377icb_status(struct icb_session *is, int type, const char *fmt, ...)
378{
379 va_list ap;
380 char buf[ICB_MSGSIZE];
381 int res, buflen = 1;
382 static const struct {
383 int type;
384 const char *msg;
385 } msgtab[] = {
386 { STATUS_ARRIVE, "Arrive" },
387 { STATUS_BOOT, "Boot" },
388 { STATUS_DEPART, "Depart" },
389 { STATUS_HELP, "Help" },
390 { STATUS_NAME, "Name" },
391 { STATUS_NOBEEP, "No-Beep" },
392 { STATUS_NOTIFY, "Notify" },
393 { STATUS_SIGNON, "Sign-on" },
394 { STATUS_SIGNOFF, "Sign-off" },
395 { STATUS_STATUS, "Status" },
396 { STATUS_TOPIC, "Topic" },
397 { STATUS_WARNING, "Warning" },
398 { 0, NULL }
399 };
400
401 if (type < 0 || type > (int)nitems(msgtab) - 1)
402 return;
403 res = snprintf(&buf[1], sizeof buf - 1, "%c%s%c", ICB_M_STATUS,
404 msgtab[type].msg, ICB_M_SEP);
405 if (res < 0) {
406 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
407 return;
408 }
409 buflen += MIN((size_t)res, sizeof buf - 1);
410 if ((size_t)buflen >= sizeof buf) {
411 icbd_log(NULL, LOG_ERR, "Status buffer too small");
412 return;
413 }
414 va_start(ap, fmt);
415 res = vsnprintf(&buf[buflen], sizeof buf - buflen, fmt, ap);
416 va_end(ap);
417 if (res < 0) {
418 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
419 return;
420 }
421 buflen += MIN((size_t)res, sizeof buf - buflen);
422 buf[0] = buflen;
423 icbd_send(is, buf, buflen + 1);
424}
425
426/*
427 * icb_status: sends a status message ('d') to the group except of the
428 * "ex" if it's not NULL
429 */
430void
431icb_status_group(struct icb_group *ig, struct icb_session *ex, int type,
432 const char *fmt, ...)
433{
434 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
435 va_list ap;
436 struct icb_session *s;
437
438 va_start(ap, fmt);
439 (void)vsnprintf(buf, sizeof buf, fmt, ap);
440 LIST_FOREACH(s, &ig->sess, entry) {
441 if (ex && s == ex)
442 continue;
443 icb_status(s, type, buf);
444 }
445 logger(ig->name, "", buf);
446 icbd_log(NULL, LOG_DEBUG, "%s", buf);
447 va_end(ap);
448}
449
450/*
451 * icb_error: sends an error message ('e') to the client
452 */
453void
454icb_error(struct icb_session *is, const char *fmt, ...)
455{
456 char buf[ICB_MSGSIZE];
457 va_list ap;
458 int res, buflen = 1;
459
460 va_start(ap, fmt);
461 res = vsnprintf(&buf[2], sizeof buf - 2, fmt, ap);
462 va_end(ap);
463 if (res < 0) {
464 icbd_log(NULL, LOG_ERR, "Format error");
465 return;
466 }
467 buflen += MIN((size_t)res, sizeof buf - 2);
468 buf[0] = ++buflen; /* account for ICB_M_ERROR */
469 buf[1] = ICB_M_ERROR;
470 icbd_send(is, buf, buflen + 1);
471 icbd_log(is, LOG_DEBUG, "%s", buf + 2);
472}
473
474/*
475 * icb_remove: removes a session from the associated group
476 */
477void
478icb_remove(struct icb_session *is, char *reason)
479{
480 if (is->group) {
481 if (icb_ismod(is->group, is))
482 (void)icb_pass(is->group, is, NULL);
483 LIST_REMOVE(is, entry);
484 if (reason)
485 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
486 "%s (%s@%s) just left: %s", is->nick, is->client,
487 is->host, reason);
488 else
489 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
490 "%s (%s@%s) just left", is->nick, is->client,
491 is->host);
492 is->group = NULL;
493 }
494}
495
496/*
497 * icb_addgroup: adds a new group to the list
498 */
499struct icb_group *
500icb_addgroup(struct icb_session *is, char *name)
501{
502 struct icb_group *ig;
503
504 if ((ig = calloc(1, sizeof *ig)) == NULL)
505 return (NULL);
506 strlcpy(ig->name, name, sizeof ig->name);
507 if (is)
508 ig->mod = is;
509 LIST_INIT(&ig->sess);
510 LIST_INSERT_HEAD(&groups, ig, entry);
511 return (ig);
512}
513
514#ifdef notused
515/*
516 * icb_delgroup: removes a group from the list
517 */
518void
519icb_delgroup(struct icb_group *ig)
520{
521 struct icb_session *s;
522
523 /* well, i guess we should kick out participants! ;-) */
524 LIST_FOREACH(s, &ig->sess, entry) {
525 icb_status(s, STATUS_WARNING, "Group dismissed");
526 s->group = NULL;
527 }
528 LIST_REMOVE(ig, entry);
529 bzero(ig, sizeof ig); /* paranoic thing, obviously */
530 free(ig);
531}
532#endif
533
534/*
535 * icb_dowho: a helper function that sends out a group header as a command
536 * output and user information in the "wl" format
537 */
538int
539icb_dowho(struct icb_session *is, struct icb_group *ig)
540{
541 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
542 struct icb_session *s;
543 time_t now;
544 int nusers = 0;
545
546 now = getmonotime();
547 icb_cmdout(is, CMDOUT_CO, " ");
548 snprintf(buf, sizeof buf, "Group: %-8s (%cvl) Mod: %-13s Topic: %s",
549 ig->name, ig->mod ? 'm' : 'p', ig->mod ? ig->mod->nick : "(None)",
550 strlen(ig->topic) > 0 ? ig->topic : "(None)");
551 icb_cmdout(is, CMDOUT_CO, buf);
552 LIST_FOREACH(s, &ig->sess, entry) {
553 (void)snprintf(buf, sizeof buf,
554 "%c%c%s%c%lld%c0%c%lld%c%s%c%s%c%s",
555 icb_ismod(ig, s) ? 'm' : ' ', ICB_M_SEP,
556 s->nick, ICB_M_SEP, now - s->last,
557 ICB_M_SEP, ICB_M_SEP, s->login, ICB_M_SEP,
558 s->client, ICB_M_SEP, s->host, ICB_M_SEP, " ");
559 icb_cmdout(is, CMDOUT_WL, buf);
560 nusers++;
561 }
562 return (nusers);
563}
564
565/*
566 * icb_who: sends a list of users of either the specified group or all
567 * groups found on the server
568 */
569void
570icb_who(struct icb_session *is, struct icb_group *ig)
571{
572 char buf[ICB_MSGSIZE - 10]; /* truncate to make sure all fits */
573 struct icb_group *g;
574
575 if (!ig) {
576 int nusers = 0, ngroups = 0;
577
578 LIST_FOREACH(g, &groups, entry) {
579 nusers += icb_dowho(is, g);
580 ngroups++;
581 }
582 if (nusers > 0) {
583 (void)snprintf(buf, sizeof buf,
584 "Total: %d %s in %d %s",
585 nusers, nusers > 1 ? "users" : "user",
586 ngroups, ngroups > 1 ? "groups" : "group");
587 } else
588 (void)snprintf(buf, sizeof buf, "No users found.");
589 icb_cmdout(is, CMDOUT_CO, buf);
590 } else
591 (void)icb_dowho(is, ig);
592}
593
594/*
595 * icb_ismod: checks whether group is moderated by "is"
596 */
597inline int
598icb_ismod(struct icb_group *ig, struct icb_session *is)
599{
600 return (ig->mod == is);
601}
602
603/*
604 * icb_modpermit: checks user against the moderators table if it has
605 * been populated
606 */
607int
608icb_modpermit(struct icb_session *is, int enforce)
609{
610 extern char modtab[ICB_MTABLEN][ICB_MAXNICKLEN];
611 extern int modtabcnt;
612
613 icbd_modupdate();
614 if ((enforce ? 0 : modtabcnt == 0) ||
615 bsearch(is->nick, modtab, modtabcnt, ICB_MAXNICKLEN,
616 (int (*)(const void *, const void *))strcmp))
617 return (1);
618 return (0);
619}
620
621/*
622 * icb_pass: passes moderation of group "ig" from "from" to "to",
623 * returns -1 if "from" is not a moderator, 1 if passed
624 * to "to" and 0 otherwise (no moderator or passed to the
625 * internal bot)
626 */
627int
628icb_pass(struct icb_group *ig, struct icb_session *from,
629 struct icb_session *to)
630{
631 if (ig->mod && ig->mod != from)
632 return (-1);
633 if (!from && !to)
634 return (-1);
635 ig->mod = to;
636 if (to)
637 icb_status(to, STATUS_NOTIFY, "%s just passed you moderation"
638 " of %s", from ? from->nick : "server", ig->name);
639 icb_status_group(ig, to, STATUS_NOTIFY, "%s has passed moderation "
640 "to %s", from ? from->nick : "server", to ? to->nick : "server");
641 return (1);
642}
643
644/*
645 * icb_sendfmt: formats a string and sends it over
646 */
647void
648icb_sendfmt(struct icb_session *is, const char *fmt, ...)
649{
650 char buf[ICB_MSGSIZE];
651 va_list ap;
652 int res, buflen = 1;
653
654 va_start(ap, fmt);
655 res = vsnprintf(&buf[1], sizeof buf - 1, fmt, ap);
656 va_end(ap);
657 if (res < 0) {
658 icbd_log(NULL, LOG_ERR, "Format error in %s", __func__);
659 return;
660 }
661 buflen += MIN((size_t)res, sizeof buf - 1);
662 buf[0] = buflen;
663 icbd_send(is, buf, buflen + 1);
664}
665
666/*
667 * icb_token: copies a sequence of characters delimited by the 'sep' character
668 * from the source buffer 'buf' at offset indicated by 'bufptr' to
669 * the destination buffer 'dst' and sets 'bufptr' to the next byte
670 * after 'sep'.
671 */
672int
673icb_token(char *buf, int len, char **bufptr, char *dst, int dstlen, int sep,
674 int trim)
675{
676 char *start;
677 int i, ret;
678
679 if (buf == NULL || len <= 0 || dst == NULL || dstlen <= 0)
680 return (0);
681 if (*bufptr == NULL)
682 *bufptr = buf;
683 start = *bufptr;
684 for (i = *bufptr - buf; i < len; i++, (*bufptr)++) {
685 if (**bufptr == sep || **bufptr == '\0') {
686 /* copy and null terminate the token */
687 ret = strlcpy(dst, start,
688 MIN(*bufptr - start + 1, dstlen));
689 if (**bufptr != '\0')
690 (*bufptr)++;
691 if (ret > 0 && trim)
692 ret = icb_trim(dst, dstlen);
693 return (ret);
694 }
695 }
696 /*
697 * Reached the end of the buffer without finding a field separator
698 * nor the end of line character. If we have advanced our pointer
699 * we should copy the resulting single field out.
700 */
701 if (*bufptr - start > 0) {
702 ret = strlcpy(dst, start, MIN(*bufptr - start + 1, dstlen));
703 if (ret > 0 && trim)
704 ret = icb_trim(dst, dstlen);
705 return (ret);
706 }
707 return (0);
708}
709
710/*
711 * icb_trim: trims trailing whitespace
712 */
713int
714icb_trim(char *buf, int len)
715{
716 char *p = buf;
717 int i;
718
719 for (i = 0; i < len && *p != '\0'; i++)
720 p++;
721 if (*p == '\0' && p - buf > 0)
722 p--;
723 while (p >= buf && isspace(*p)) {
724 *p = '\0';
725 i--;
726 if (p > buf)
727 p--;
728 }
729 return (i);
730}
731
732/*
733 * icb_vis: strnvis-like function that escapes percentages as well
734 */
735int
736icb_vis(char *dst, const char *src, size_t dstsize, int flags)
737{
738 int si = 0, di = 0, td;
739
740 while ((size_t)di < dstsize - 1 && src[si] != '\0') {
741 if (src[si] == '%') {
742 if ((size_t)di + 1 >= dstsize - 1)
743 break;
744 dst[di++] = '%', dst[di] = '%';
745 } else if (src[si] == ' ' && flags & VIS_SP)
746 dst[di] = '_';
747 else if (isgraph(src[si]) || src[si] == ' ')
748 dst[di] = src[si];
749 else {
750 td = snprintf(&dst[di], dstsize - di,
751 "\\%03o", (unsigned char)src[si]);
752 if (td == -1 || (size_t)td >= dstsize - di)
753 break;
754 di += td - 1;
755 }
756 si++, di++;
757 }
758 dst[MIN((size_t)di, dstsize - 1)] = '\0';
759 return (0);
760}
Note: See TracBrowser for help on using the repository browser.