main/file.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Generic File Format Support.
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  */
  25
  26 #include "asterisk.h"
  27
  28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  29
  30 #include <dirent.h>
  31 #include <sys/stat.h>
  32 #include <math.h>
  33
  34 #include "asterisk/_private.h"  /* declare ast_file_init() */
  35 #include "asterisk/paths.h"     /* use ast_config_AST_DATA_DIR */
  36 #include "asterisk/mod_format.h"
  37 #include "asterisk/cli.h"
  38 #include "asterisk/channel.h"
  39 #include "asterisk/sched.h"
  40 #include "asterisk/translate.h"
  41 #include "asterisk/utils.h"
  42 #include "asterisk/lock.h"
  43 #include "asterisk/app.h"
  44 #include "asterisk/pbx.h"
  45 #include "asterisk/linkedlists.h"
  46 #include "asterisk/module.h"
  47 #include "asterisk/astobj2.h"
  48 #include "asterisk/test.h"
  49
  50 /*! \brief
  51  * The following variable controls the layout of localized sound files.
  52  * If 0, use the historical layout with prefix just before the filename
  53  * (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
  54  * if 1 put the prefix at the beginning of the filename
  55  * (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
  56  * The latter permits a language to be entirely in one directory.
  57  *
  58  * This is settable in asterisk.conf.
  59  */
  60 int ast_language_is_prefix = 1;
  61
  62 static AST_RWLIST_HEAD_STATIC(formats, ast_format);
  63
  64 int __ast_format_register(const struct ast_format *f, struct ast_module *mod)
  65 {
  66         struct ast_format *tmp;
  67
  68         AST_RWLIST_WRLOCK(&formats);
  69         AST_RWLIST_TRAVERSE(&formats, tmp, list) {
  70                 if (!strcasecmp(f->name, tmp->name)) {
  71                         AST_RWLIST_UNLOCK(&formats);
  72                         ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
  73                         return -1;
  74                 }
  75         }
  76         if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
  77                 AST_RWLIST_UNLOCK(&formats);
  78                 return -1;
  79         }
  80         *tmp = *f;
  81         tmp->module = mod;
  82         if (tmp->buf_size) {
  83                 /*
  84                  * Align buf_size properly, rounding up to the machine-specific
  85                  * alignment for pointers.
  86                  */
  87                 struct _test_align { void *a, *b; } p;
  88                 int align = (char *)&p.b - (char *)&p.a;
  89                 tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
  90         }
  91
  92         memset(&tmp->list, 0, sizeof(tmp->list));
  93
  94         AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
  95         AST_RWLIST_UNLOCK(&formats);
  96         ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
  97
  98         return 0;
  99 }
 100
 101 int ast_format_unregister(const char *name)
 102 {
 103         struct ast_format *tmp;
 104         int res = -1;
 105
 106         AST_RWLIST_WRLOCK(&formats);
 107         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
 108                 if (!strcasecmp(name, tmp->name)) {
 109                         AST_RWLIST_REMOVE_CURRENT(list);
 110                         ast_free(tmp);
 111                         res = 0;
 112                 }
 113         }
 114         AST_RWLIST_TRAVERSE_SAFE_END;
 115         AST_RWLIST_UNLOCK(&formats);
 116
 117         if (!res)
 118                 ast_verb(2, "Unregistered format %s\n", name);
 119         else
 120                 ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
 121
 122         return res;
 123 }
 124
 125 int ast_stopstream(struct ast_channel *tmp)
 126 {
 127         ast_channel_lock(tmp);
 128
 129         /* Stop a running stream if there is one */
 130         if (tmp->stream) {
 131                 ast_closestream(tmp->stream);
 132                 tmp->stream = NULL;
 133                 if (tmp->oldwriteformat && ast_set_write_format(tmp, tmp->oldwriteformat))
 134                         ast_log(LOG_WARNING, "Unable to restore format back to %s\n", ast_getformatname(tmp->oldwriteformat));
 135         }
 136         /* Stop the video stream too */
 137         if (tmp->vstream != NULL) {
 138                 ast_closestream(tmp->vstream);
 139                 tmp->vstream = NULL;
 140         }
 141
 142         ast_channel_unlock(tmp);
 143
 144         return 0;
 145 }
 146
 147 int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
 148 {
 149         int res = -1;
 150         int alt = 0;
 151         if (f->frametype == AST_FRAME_VIDEO) {
 152                 if (fs->fmt->format & AST_FORMAT_AUDIO_MASK) {
 153                         /* This is the audio portion.  Call the video one... */
 154                         if (!fs->vfs && fs->filename) {
 155                                 const char *type = ast_getformatname(f->subclass.codec & ~0x1);
 156                                 fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
 157                                 ast_debug(1, "Opened video output file\n");
 158                         }
 159                         if (fs->vfs)
 160                                 return ast_writestream(fs->vfs, f);
 161                         /* else ignore */
 162                         return 0;
 163                 } else {
 164                         /* Might / might not have mark set */
 165                         alt = 1;
 166                 }
 167         } else if (f->frametype != AST_FRAME_VOICE) {
 168                 ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
 169                 return -1;
 170         }
 171         if (((fs->fmt->format | alt) & f->subclass.codec) == f->subclass.codec) {
 172                 res =  fs->fmt->write(fs, f);
 173                 if (res < 0)
 174                         ast_log(LOG_WARNING, "Natural write failed\n");
 175                 else if (res > 0)
 176                         ast_log(LOG_WARNING, "Huh??\n");
 177         } else {
 178                 /* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
 179                        the one we've setup a translator for, we do the "wrong thing" XXX */
 180                 if (fs->trans && f->subclass.codec != fs->lastwriteformat) {
 181                         ast_translator_free_path(fs->trans);
 182                         fs->trans = NULL;
 183                 }
 184                 if (!fs->trans)
 185                         fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass.codec);
 186                 if (!fs->trans)
 187                         ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
 188                                 fs->fmt->name, ast_getformatname(f->subclass.codec));
 189                 else {
 190                         struct ast_frame *trf;
 191                         fs->lastwriteformat = f->subclass.codec;
 192                         /* Get the translated frame but don't consume the original in case they're using it on another stream */
 193                         if ((trf = ast_translate(fs->trans, f, 0))) {
 194                                 struct ast_frame *cur;
 195
 196                                 /* the translator may have returned multiple frames, so process them */
 197                                 for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
 198                                         if ((res = fs->fmt->write(fs, trf))) {
 199                                                 ast_log(LOG_WARNING, "Translated frame write failed\n");
 200                                                 break;
 201                                         }
 202                                 }
 203                                 ast_frfree(trf);
 204                         } else {
 205                                 res = 0;
 206                         }
 207                 }
 208         }
 209         return res;
 210 }
 211
 212 static int copy(const char *infile, const char *outfile)
 213 {
 214         int ifd, ofd, len;
 215         char buf[4096]; /* XXX make it lerger. */
 216
 217         if ((ifd = open(infile, O_RDONLY)) < 0) {
 218                 ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
 219                 return -1;
 220         }
 221         if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
 222                 ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
 223                 close(ifd);
 224                 return -1;
 225         }
 226         while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
 227                 int res;
 228                 if (len < 0) {
 229                         ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
 230                         break;
 231                 }
 232                 /* XXX handle partial writes */
 233                 res = write(ofd, buf, len);
 234                 if (res != len) {
 235                         ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
 236                         len = -1; /* error marker */
 237                         break;
 238                 }
 239         }
 240         close(ifd);
 241         close(ofd);
 242         if (len < 0) {
 243                 unlink(outfile);
 244                 return -1; /* error */
 245         }
 246         return 0;       /* success */
 247 }
 248
 249 /*!
 250  * \brief construct a filename. Absolute pathnames are preserved,
 251  * relative names are prefixed by the sounds/ directory.
 252  * The wav49 suffix is replaced by 'WAV'.
 253  * Returns a malloc'ed string to be freed by the caller.
 254  */
 255 static char *build_filename(const char *filename, const char *ext)
 256 {
 257         char *fn = NULL;
 258
 259         if (!strcmp(ext, "wav49"))
 260                 ext = "WAV";
 261
 262         if (filename[0] == '/') {
 263                 if (asprintf(&fn, "%s.%s", filename, ext) < 0) {
 264                         ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
 265                         fn = NULL;
 266                 }
 267         } else {
 268                 if (asprintf(&fn, "%s/sounds/%s.%s",
 269                              ast_config_AST_DATA_DIR, filename, ext) < 0) {
 270                         ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
 271                         fn = NULL;
 272                 }
 273         }
 274         return fn;
 275 }
 276
 277 /* compare type against the list 'exts' */
 278 /* XXX need a better algorithm */
 279 static int exts_compare(const char *exts, const char *type)
 280 {
 281         char tmp[256];
 282         char *stringp = tmp, *ext;
 283
 284         ast_copy_string(tmp, exts, sizeof(tmp));
 285         while ((ext = strsep(&stringp, "|"))) {
 286                 if (!strcmp(ext, type))
 287                         return 1;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static void filestream_destructor(void *arg)
 294 {
 295         char *cmd = NULL;
 296         size_t size = 0;
 297         struct ast_filestream *f = arg;
 298
 299         /* Stop a running stream if there is one */
 300         if (f->owner) {
 301                 if (f->fmt->format < AST_FORMAT_AUDIO_MASK) {
 302                         f->owner->stream = NULL;
 303                         AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
 304                         ast_settimeout(f->owner, 0, NULL, NULL);
 305                 } else {
 306                         f->owner->vstream = NULL;
 307                         AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
 308                 }
 309         }
 310         /* destroy the translator on exit */
 311         if (f->trans)
 312                 ast_translator_free_path(f->trans);
 313
 314         if (f->realfilename && f->filename) {
 315                         size = strlen(f->filename) + strlen(f->realfilename) + 15;
 316                         cmd = alloca(size);
 317                         memset(cmd,0,size);
 318                         snprintf(cmd,size,"/bin/mv -f %s %s",f->filename,f->realfilename);
 319                         ast_safe_system(cmd);
 320         }
 321
 322         if (f->filename)
 323                 free(f->filename);
 324         if (f->realfilename)
 325                 free(f->realfilename);
 326         if (f->fmt->close) {
 327                 void (*closefn)(struct ast_filestream *) = f->fmt->close;
 328                 closefn(f);
 329         }
 330         if (f->f)
 331                 fclose(f->f);
 332         if (f->vfs)
 333                 ast_closestream(f->vfs);
 334         if (f->write_buffer) {
 335                 ast_free(f->write_buffer);
 336         }
 337         if (f->orig_chan_name)
 338                 free((void *) f->orig_chan_name);
 339         ast_module_unref(f->fmt->module);
 340 }
 341
 342 static struct ast_filestream *get_filestream(struct ast_format *fmt, FILE *bfile)
 343 {
 344         struct ast_filestream *s;
 345
 346         int l = sizeof(*s) + fmt->buf_size + fmt->desc_size;    /* total allocation size */
 347         if ( (s = ao2_alloc(l, filestream_destructor)) == NULL)
 348                 return NULL;
 349         s->fmt = fmt;
 350         s->f = bfile;
 351
 352         if (fmt->desc_size)
 353                 s->_private = ((char *)(s + 1)) + fmt->buf_size;
 354         if (fmt->buf_size)
 355                 s->buf = (char *)(s + 1);
 356         s->fr.src = fmt->name;
 357         return s;
 358 }
 359
 360 /*
 361  * Default implementations of open and rewrite.
 362  * Only use them if you don't have expensive stuff to do.
 363  */
 364 enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
 365
 366 static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
 367 {
 368         struct ast_format *f = s->fmt;
 369         int ret = -1;
 370         int (*openfn)(struct ast_filestream *s);
 371
 372         if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
 373                 ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
 374         else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
 375                 ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
 376         else {
 377                 /* preliminary checks succeed. update usecount */
 378                 ast_module_ref(f->module);
 379                 ret = 0;
 380         }
 381         return ret;
 382 }
 383
 384 static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
 385 {
 386         return fn_wrapper(s, comment, WRAP_REWRITE);
 387 }
 388
 389 static int open_wrapper(struct ast_filestream *s)
 390 {
 391         return fn_wrapper(s, NULL, WRAP_OPEN);
 392 }
 393
 394 enum file_action {
 395         ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
 396         ACTION_DELETE,  /* delete file, return 0 on success, -1 on error */
 397         ACTION_RENAME,  /* rename file. return 0 on success, -1 on error */
 398         ACTION_OPEN,
 399         ACTION_COPY     /* copy file. return 0 on success, -1 on error */
 400 };
 401
 402 /*!
 403  * \brief perform various actions on a file. Second argument
 404  * arg2 depends on the command:
 405  *      unused for EXISTS and DELETE
 406  *      destination file name (const char *) for COPY and RENAME
 407  *      struct ast_channel * for OPEN
 408  * if fmt is NULL, OPEN will return the first matching entry,
 409  * whereas other functions will run on all matching entries.
 410  */
 411 static format_t ast_filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
 412 {
 413         struct ast_format *f;
 414         format_t res = (action == ACTION_EXISTS) ? 0 : -1;
 415
 416         AST_RWLIST_RDLOCK(&formats);
 417         /* Check for a specific format */
 418         AST_RWLIST_TRAVERSE(&formats, f, list) {
 419                 char *stringp, *ext = NULL;
 420
 421                 if (fmt && !exts_compare(f->exts, fmt))
 422                         continue;
 423
 424                 /* Look for a file matching the supported extensions.
 425                  * The file must exist, and for OPEN, must match
 426                  * one of the formats supported by the channel.
 427                  */
 428                 stringp = ast_strdupa(f->exts); /* this is in the stack so does not need to be freed */
 429                 while ( (ext = strsep(&stringp, "|")) ) {
 430                         struct stat st;
 431                         char *fn = build_filename(filename, ext);
 432
 433                         if (fn == NULL)
 434                                 continue;
 435
 436                         if ( stat(fn, &st) ) { /* file not existent */
 437                                 ast_free(fn);
 438                                 continue;
 439                         }
 440                         /* for 'OPEN' we need to be sure that the format matches
 441                          * what the channel can process
 442                          */
 443                         if (action == ACTION_OPEN) {
 444                                 struct ast_channel *chan = (struct ast_channel *)arg2;
 445                                 FILE *bfile;
 446                                 struct ast_filestream *s;
 447
 448                                 if ( !(chan->writeformat & f->format) &&
 449                                      !((f->format & AST_FORMAT_AUDIO_MASK && fmt) ||
 450                                           (f->format & AST_FORMAT_VIDEO_MASK && fmt))) {
 451                                         ast_free(fn);
 452                                         continue;       /* not a supported format */
 453                                 }
 454                                 if ( (bfile = fopen(fn, "r")) == NULL) {
 455                                         ast_free(fn);
 456                                         continue;       /* cannot open file */
 457                                 }
 458                                 s = get_filestream(f, bfile);
 459                                 if (!s) {
 460                                         fclose(bfile);
 461                                         ast_free(fn);   /* cannot allocate descriptor */
 462                                         continue;
 463                                 }
 464                                 if (open_wrapper(s)) {
 465                                         ast_free(fn);
 466                                         ast_closestream(s);
 467                                         continue;       /* cannot run open on file */
 468                                 }
 469                                 if (st.st_size == 0) {
 470                                         ast_log(LOG_WARNING, "File %s detected to have zero size.\n", fn);
 471                                 }
 472                                 /* ok this is good for OPEN */
 473                                 res = 1;        /* found */
 474                                 s->lasttimeout = -1;
 475                                 s->fmt = f;
 476                                 s->trans = NULL;
 477                                 s->filename = NULL;
 478                                 if (s->fmt->format & AST_FORMAT_AUDIO_MASK) {
 479                                         if (chan->stream)
 480                                                 ast_closestream(chan->stream);
 481                                         chan->stream = s;
 482                                 } else {
 483                                         if (chan->vstream)
 484                                                 ast_closestream(chan->vstream);
 485                                         chan->vstream = s;
 486                                 }
 487                                 ast_free(fn);
 488                                 break;
 489                         }
 490                         switch (action) {
 491                         case ACTION_OPEN:
 492                                 break;  /* will never get here */
 493
 494                         case ACTION_EXISTS:     /* return the matching format */
 495                                 res |= f->format;
 496                                 break;
 497
 498                         case ACTION_DELETE:
 499                                 if ( (res = unlink(fn)) )
 500                                         ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
 501                                 break;
 502
 503                         case ACTION_RENAME:
 504                         case ACTION_COPY: {
 505                                 char *nfn = build_filename((const char *)arg2, ext);
 506                                 if (!nfn)
 507                                         ast_log(LOG_WARNING, "Out of memory\n");
 508                                 else {
 509                                         res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
 510                                         if (res)
 511                                                 ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
 512                                                         action == ACTION_COPY ? "copy" : "rename",
 513                                                          fn, nfn, strerror(errno));
 514                                         ast_free(nfn);
 515                                 }
 516                             }
 517                                 break;
 518
 519                         default:
 520                                 ast_log(LOG_WARNING, "Unknown helper %d\n", action);
 521                         }
 522                         ast_free(fn);
 523                 }
 524         }
 525         AST_RWLIST_UNLOCK(&formats);
 526         return res;
 527 }
 528
 529 static int is_absolute_path(const char *filename)
 530 {
 531         return filename[0] == '/';
 532 }
 533
 534 static format_t fileexists_test(const char *filename, const char *fmt, const char *lang,
 535                            char *buf, int buflen)
 536 {
 537         if (buf == NULL) {
 538                 return -1;
 539         }
 540
 541         if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
 542                 if (lang) {
 543                         snprintf(buf, buflen, "%s/%s", lang, filename);
 544                 } else {
 545                         snprintf(buf, buflen, "%s", filename);
 546                 }
 547         } else { /* old layout */
 548                 strcpy(buf, filename);  /* first copy the full string */
 549                 if (lang) {
 550                         /* insert the language and suffix if needed */
 551                         const char *c = strrchr(filename, '/');
 552                         int offset = c ? c - filename + 1 : 0;  /* points right after the last '/' */
 553                         snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
 554                 }
 555         }
 556
 557         return ast_filehelper(buf, NULL, fmt, ACTION_EXISTS);
 558 }
 559
 560 /*!
 561  * \brief helper routine to locate a file with a given format
 562  * and language preference.
 563  * Try preflang, preflang with stripped '_' suffices, or NULL.
 564  *
 565  * The last parameter(s) point to a buffer of sufficient size,
 566  * which on success is filled with the matching filename.
 567  */
 568 static format_t fileexists_core(const char *filename, const char *fmt, const char *preflang,
 569                            char *buf, int buflen)
 570 {
 571         format_t res = -1;
 572         char *lang;
 573
 574         if (buf == NULL) {
 575                 return -1;
 576         }
 577
 578         /* We try languages in the following order:
 579          *    preflang (may include dialect and style codes)
 580          *    lang (preflang without dialect - if any)
 581          *    <none>
 582          *    default (unless the same as preflang or lang without dialect)
 583          */
 584
 585         lang = ast_strdupa(preflang);
 586
 587         /* Try preferred language, including removing any style or dialect codes */
 588         while (!ast_strlen_zero(lang)) {
 589                 char *end;
 590
 591                 if ((res = fileexists_test(filename, fmt, lang, buf, buflen)) > 0) {
 592                         return res;
 593                 }
 594
 595                 if ((end = strrchr(lang, '_')) != NULL) {
 596                         *end = '\0';
 597                         continue;
 598                 }
 599
 600                 break;
 601         }
 602
 603         /* Try without any language */
 604         if ((res = fileexists_test(filename, fmt, NULL, buf, buflen)) > 0) {
 605                 return res;
 606         }
 607
 608         /* Finally try the default language unless it was already tried before */
 609         if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
 610                 if ((res = fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen)) > 0) {
 611                         return res;
 612                 }
 613         }
 614
 615         return 0;
 616 }
 617
 618 struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
 619 {
 620         return ast_openstream_full(chan, filename, preflang, 0);
 621 }
 622
 623 struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
 624 {
 625         /*
 626          * Use fileexists_core() to find a file in a compatible
 627          * language and format, set up a suitable translator,
 628          * and open the stream.
 629          */
 630         format_t fmts, res;
 631         int buflen;
 632         char *buf;
 633
 634         if (!asis) {
 635                 /* do this first, otherwise we detect the wrong writeformat */
 636                 ast_stopstream(chan);
 637                 if (chan->generator)
 638                         ast_deactivate_generator(chan);
 639         }
 640         if (preflang == NULL)
 641                 preflang = "";
 642         buflen = strlen(preflang) + strlen(filename) + 4;
 643         buf = alloca(buflen);
 644         if (buf == NULL)
 645                 return NULL;
 646         fmts = fileexists_core(filename, NULL, preflang, buf, buflen);
 647         if (fmts > 0)
 648                 fmts &= AST_FORMAT_AUDIO_MASK;
 649         if (fmts < 1) {
 650                 ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
 651                 return NULL;
 652         }
 653         chan->oldwriteformat = chan->writeformat;
 654         /* Set the channel to a format we can work with */
 655         res = ast_set_write_format(chan, fmts);
 656         if (res == -1) {        /* No format available that works with this channel */
 657                 return NULL;
 658         }
 659         res = ast_filehelper(buf, chan, NULL, ACTION_OPEN);
 660         if (res >= 0)
 661                 return chan->stream;
 662         return NULL;
 663 }
 664
 665 struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
 666 {
 667         /* As above, but for video. But here we don't have translators
 668          * so we must enforce a format.
 669          */
 670         format_t format;
 671         char *buf;
 672         int buflen;
 673
 674         if (preflang == NULL)
 675                 preflang = "";
 676         buflen = strlen(preflang) + strlen(filename) + 4;
 677         buf = alloca(buflen);
 678         if (buf == NULL)
 679                 return NULL;
 680
 681         for (format = AST_FORMAT_AUDIO_MASK + 1; format <= AST_FORMAT_VIDEO_MASK; format = format << 1) {
 682                 int fd;
 683                 const char *fmt;
 684
 685                 if (!(chan->nativeformats & format))
 686                         continue;
 687                 fmt = ast_getformatname(format);
 688                 if ( fileexists_core(filename, fmt, preflang, buf, buflen) < 1) /* no valid format */
 689                         continue;
 690                 fd = ast_filehelper(buf, chan, fmt, ACTION_OPEN);
 691                 if (fd >= 0)
 692                         return chan->vstream;
 693                 ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
 694         }
 695         return NULL;
 696 }
 697
 698 static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
 699 {
 700         struct ast_frame *fr, *new_fr;
 701
 702         if (!s || !s->fmt) {
 703                 return NULL;
 704         }
 705
 706         if (!(fr = s->fmt->read(s, whennext))) {
 707                 return NULL;
 708         }
 709
 710         if (!(new_fr = ast_frisolate(fr))) {
 711                 ast_frfree(fr);
 712                 return NULL;
 713         }
 714
 715         if (new_fr != fr) {
 716                 ast_frfree(fr);
 717                 fr = new_fr;
 718         }
 719
 720         return fr;
 721 }
 722
 723 struct ast_frame *ast_readframe(struct ast_filestream *s)
 724 {
 725         int whennext = 0;
 726
 727         return read_frame(s, &whennext);
 728 }
 729
 730 enum fsread_res {
 731         FSREAD_FAILURE,
 732         FSREAD_SUCCESS_SCHED,
 733         FSREAD_SUCCESS_NOSCHED,
 734 };
 735
 736 static int ast_fsread_audio(const void *data);
 737
 738 static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
 739 {
 740         int whennext = 0;
 741
 742         while (!whennext) {
 743                 struct ast_frame *fr;
 744
 745                 if (s->orig_chan_name && strcasecmp(s->owner->name, s->orig_chan_name)) {
 746                         goto return_failure;
 747                 }
 748
 749                 fr = read_frame(s, &whennext);
 750
 751                 if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
 752                         if (fr) {
 753                                 ast_log(LOG_WARNING, "Failed to write frame\n");
 754                                 ast_frfree(fr);
 755                         }
 756                         goto return_failure;
 757                 }
 758
 759                 if (fr) {
 760                         ast_frfree(fr);
 761                 }
 762         }
 763
 764         if (whennext != s->lasttimeout) {
 765                 if (s->owner->timingfd > -1) {
 766                         float samp_rate = (float) ast_format_rate(s->fmt->format);
 767                         unsigned int rate;
 768
 769                         rate = (unsigned int) roundf(samp_rate / ((float) whennext));
 770
 771                         ast_settimeout(s->owner, rate, ast_fsread_audio, s);
 772                 } else {
 773                         s->owner->streamid = ast_sched_add(s->owner->sched,
 774                                 whennext / (ast_format_rate(s->fmt->format) / 1000), ast_fsread_audio, s);
 775                 }
 776                 s->lasttimeout = whennext;
 777                 return FSREAD_SUCCESS_NOSCHED;
 778         }
 779         return FSREAD_SUCCESS_SCHED;
 780
 781 return_failure:
 782         s->owner->streamid = -1;
 783         ast_settimeout(s->owner, 0, NULL, NULL);
 784         return FSREAD_FAILURE;
 785 }
 786
 787 static int ast_fsread_audio(const void *data)
 788 {
 789         struct ast_filestream *fs = (struct ast_filestream *)data;
 790         enum fsread_res res;
 791
 792         res = ast_readaudio_callback(fs);
 793
 794         if (res == FSREAD_SUCCESS_SCHED)
 795                 return 1;
 796
 797         return 0;
 798 }
 799
 800 static int ast_fsread_video(const void *data);
 801
 802 static enum fsread_res ast_readvideo_callback(struct ast_filestream *s)
 803 {
 804         int whennext = 0;
 805
 806         while (!whennext) {
 807                 struct ast_frame *fr = read_frame(s, &whennext);
 808
 809                 if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
 810                         if (fr) {
 811                                 ast_log(LOG_WARNING, "Failed to write frame\n");
 812                                 ast_frfree(fr);
 813                         }
 814                         s->owner->vstreamid = -1;
 815                         return FSREAD_FAILURE;
 816                 }
 817
 818                 if (fr) {
 819                         ast_frfree(fr);
 820                 }
 821         }
 822
 823         if (whennext != s->lasttimeout) {
 824                 s->owner->vstreamid = ast_sched_add(s->owner->sched,
 825                         whennext / (ast_format_rate(s->fmt->format) / 1000),
 826                         ast_fsread_video, s);
 827                 s->lasttimeout = whennext;
 828                 return FSREAD_SUCCESS_NOSCHED;
 829         }
 830
 831         return FSREAD_SUCCESS_SCHED;
 832 }
 833
 834 static int ast_fsread_video(const void *data)
 835 {
 836         struct ast_filestream *fs = (struct ast_filestream *)data;
 837         enum fsread_res res;
 838
 839         res = ast_readvideo_callback(fs);
 840
 841         if (res == FSREAD_SUCCESS_SCHED)
 842                 return 1;
 843
 844         return 0;
 845 }
 846
 847 int ast_applystream(struct ast_channel *chan, struct ast_filestream *s)
 848 {
 849         s->owner = chan;
 850         return 0;
 851 }
 852
 853 int ast_playstream(struct ast_filestream *s)
 854 {
 855         enum fsread_res res;
 856
 857         if (s->fmt->format & AST_FORMAT_AUDIO_MASK)
 858                 res = ast_readaudio_callback(s);
 859         else
 860                 res = ast_readvideo_callback(s);
 861
 862         return (res == FSREAD_FAILURE) ? -1 : 0;
 863 }
 864
 865 int ast_seekstream(struct ast_filestream *fs, off_t sample_offset, int whence)
 866 {
 867         return fs->fmt->seek(fs, sample_offset, whence);
 868 }
 869
 870 int ast_truncstream(struct ast_filestream *fs)
 871 {
 872         return fs->fmt->trunc(fs);
 873 }
 874
 875 off_t ast_tellstream(struct ast_filestream *fs)
 876 {
 877         return fs->fmt->tell(fs);
 878 }
 879
 880 int ast_stream_fastforward(struct ast_filestream *fs, off_t ms)
 881 {
 882         return ast_seekstream(fs, ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
 883 }
 884
 885 int ast_stream_rewind(struct ast_filestream *fs, off_t ms)
 886 {
 887         return ast_seekstream(fs, -ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
 888 }
 889
 890 int ast_closestream(struct ast_filestream *f)
 891 {
 892         /* This used to destroy the filestream, but it now just decrements a refcount.
 893          * We need to force the stream to quit queuing frames now, because we might
 894          * change the writeformat, which could result in a subsequent write error, if
 895          * the format is different. */
 896
 897         /* Stop a running stream if there is one */
 898         if (f->owner) {
 899                 if (f->fmt->format < AST_FORMAT_AUDIO_MASK) {
 900                         f->owner->stream = NULL;
 901                         AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
 902                         ast_settimeout(f->owner, 0, NULL, NULL);
 903                 } else {
 904                         f->owner->vstream = NULL;
 905                         AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
 906                 }
 907         }
 908
 909         ao2_ref(f, -1);
 910         return 0;
 911 }
 912
 913
 914 /*
 915  * Look the various language-specific places where a file could exist.
 916  */
 917 int ast_fileexists(const char *filename, const char *fmt, const char *preflang)
 918 {
 919         char *buf;
 920         int buflen;
 921
 922         if (preflang == NULL)
 923                 preflang = "";
 924         buflen = strlen(preflang) + strlen(filename) + 4;       /* room for everything */
 925         buf = alloca(buflen);
 926         if (buf == NULL)
 927                 return 0;
 928         return fileexists_core(filename, fmt, preflang, buf, buflen);
 929 }
 930
 931 int ast_filedelete(const char *filename, const char *fmt)
 932 {
 933         return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
 934 }
 935
 936 int ast_filerename(const char *filename, const char *filename2, const char *fmt)
 937 {
 938         return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
 939 }
 940
 941 int ast_filecopy(const char *filename, const char *filename2, const char *fmt)
 942 {
 943         return ast_filehelper(filename, filename2, fmt, ACTION_COPY);
 944 }
 945
 946 int ast_streamfile(struct ast_channel *chan, const char *filename, const char *preflang)
 947 {
 948         struct ast_filestream *fs;
 949         struct ast_filestream *vfs=NULL;
 950         char fmt[256];
 951         int seekattempt;
 952         int res;
 953
 954         fs = ast_openstream(chan, filename, preflang);
 955         if (!fs) {
 956                 ast_log(LOG_WARNING, "Unable to open %s (format %s): %s\n", filename, ast_getformatname_multiple(fmt, sizeof(fmt), chan->nativeformats), strerror(errno));
 957                 return -1;
 958         }
 959
 960         /* check to see if there is any data present (not a zero length file),
 961          * done this way because there is no where for ast_openstream_full to
 962          * return the file had no data. */
 963         seekattempt = fseek(fs->f, -1, SEEK_END);
 964         if (!seekattempt)
 965                 ast_seekstream(fs, 0, SEEK_SET);
 966         else
 967                 return 0;
 968
 969         vfs = ast_openvstream(chan, filename, preflang);
 970         if (vfs) {
 971                 ast_debug(1, "Ooh, found a video stream, too, format %s\n", ast_getformatname(vfs->fmt->format));
 972         }
 973
 974         if (ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM))
 975                 fs->orig_chan_name = ast_strdup(chan->name);
 976         if (ast_applystream(chan, fs))
 977                 return -1;
 978         if (vfs && ast_applystream(chan, vfs))
 979                 return -1;
 980         res = ast_playstream(fs);
 981         if (!res && vfs)
 982                 res = ast_playstream(vfs);
 983         ast_verb(3, "<%s> Playing '%s.%s' (language '%s')\n", chan->name, filename, ast_getformatname(chan->writeformat), preflang ? preflang : "default");
 984
 985         return res;
 986 }
 987
 988 struct ast_filestream *ast_readfile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
 989 {
 990         FILE *bfile;
 991         struct ast_format *f;
 992         struct ast_filestream *fs = NULL;
 993         char *fn;
 994         int format_found = 0;
 995
 996         AST_RWLIST_RDLOCK(&formats);
 997
 998         AST_RWLIST_TRAVERSE(&formats, f, list) {
 999                 fs = NULL;
1000                 if (!exts_compare(f->exts, type))
1001                         continue;
1002                 else
1003                         format_found = 1;
1004
1005                 fn = build_filename(filename, type);
1006                 errno = 0;
1007                 bfile = fopen(fn, "r");
1008
1009                 if (!bfile || (fs = get_filestream(f, bfile)) == NULL || open_wrapper(fs) ) {
1010                         ast_log(LOG_WARNING, "Unable to open %s\n", fn);
1011                         if (fs) {
1012                                 ast_closestream(fs);
1013                         }
1014                         fs = NULL;
1015                         bfile = NULL;
1016                         ast_free(fn);
1017                         break;
1018                 }
1019                 /* found it */
1020                 fs->trans = NULL;
1021                 fs->fmt = f;
1022                 fs->flags = flags;
1023                 fs->mode = mode;
1024                 fs->filename = ast_strdup(filename);
1025                 fs->vfs = NULL;
1026                 break;
1027         }
1028
1029         AST_RWLIST_UNLOCK(&formats);
1030         if (!format_found)
1031                 ast_log(LOG_WARNING, "No such format '%s'\n", type);
1032
1033         return fs;
1034 }
1035
1036 struct ast_filestream *ast_writefile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
1037 {
1038         int fd, myflags = 0;
1039         /* compiler claims this variable can be used before initialization... */
1040         FILE *bfile = NULL;
1041         struct ast_format *f;
1042         struct ast_filestream *fs = NULL;
1043         char *buf = NULL;
1044         size_t size = 0;
1045         int format_found = 0;
1046
1047         AST_RWLIST_RDLOCK(&formats);
1048
1049         /* set the O_TRUNC flag if and only if there is no O_APPEND specified */
1050         /* We really can't use O_APPEND as it will break WAV header updates */
1051         if (flags & O_APPEND) {
1052                 flags &= ~O_APPEND;
1053         } else {
1054                 myflags = O_TRUNC;
1055         }
1056
1057         myflags |= O_WRONLY | O_CREAT;
1058
1059         /* XXX need to fix this - we should just do the fopen,
1060          * not open followed by fdopen()
1061          */
1062         AST_RWLIST_TRAVERSE(&formats, f, list) {
1063                 char *fn, *orig_fn = NULL;
1064                 if (fs)
1065                         break;
1066
1067                 if (!exts_compare(f->exts, type))
1068                         continue;
1069                 else
1070                         format_found = 1;
1071
1072                 fn = build_filename(filename, type);
1073                 fd = open(fn, flags | myflags, mode);
1074                 if (fd > -1) {
1075                         /* fdopen() the resulting file stream */
1076                         bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
1077                         if (!bfile) {
1078                                 ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
1079                                 close(fd);
1080                                 fd = -1;
1081                         }
1082                 }
1083
1084                 if (ast_opt_cache_record_files && (fd > -1)) {
1085                         char *c;
1086
1087                         fclose(bfile);  /* this also closes fd */
1088                         /*
1089                           We touch orig_fn just as a place-holder so other things (like vmail) see the file is there.
1090                           What we are really doing is writing to record_cache_dir until we are done then we will mv the file into place.
1091                         */
1092                         orig_fn = ast_strdupa(fn);
1093                         for (c = fn; *c; c++)
1094                                 if (*c == '/')
1095                                         *c = '_';
1096
1097                         size = strlen(fn) + strlen(record_cache_dir) + 2;
1098                         buf = alloca(size);
1099                         strcpy(buf, record_cache_dir);
1100                         strcat(buf, "/");
1101                         strcat(buf, fn);
1102                         ast_free(fn);
1103                         fn = buf;
1104                         fd = open(fn, flags | myflags, mode);
1105                         if (fd > -1) {
1106                                 /* fdopen() the resulting file stream */
1107                                 bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
1108                                 if (!bfile) {
1109                                         ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
1110                                         close(fd);
1111                                         fd = -1;
1112                                 }
1113                         }
1114                 }
1115                 if (fd > -1) {
1116                         errno = 0;
1117                         fs = get_filestream(f, bfile);
1118                         if (!fs || rewrite_wrapper(fs, comment)) {
1119                                 ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
1120                                 close(fd);
1121                                 if (orig_fn) {
1122                                         unlink(fn);
1123                                         unlink(orig_fn);
1124                                 }
1125                                 if (fs) {
1126                                         ast_closestream(fs);
1127                                         fs = NULL;
1128                                 }
1129                                 continue;
1130                         }
1131                         fs->trans = NULL;
1132                         fs->fmt = f;
1133                         fs->flags = flags;
1134                         fs->mode = mode;
1135                         if (orig_fn) {
1136                                 fs->realfilename = ast_strdup(orig_fn);
1137                                 fs->filename = ast_strdup(fn);
1138                         } else {
1139                                 fs->realfilename = NULL;
1140                                 fs->filename = ast_strdup(filename);
1141                         }
1142                         fs->vfs = NULL;
1143                         /* If truncated, we'll be at the beginning; if not truncated, then append */
1144
1145                         if ((fs->write_buffer = ast_malloc(32768))){
1146                                 setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
1147                         }
1148
1149                         f->seek(fs, 0, SEEK_END);
1150                 } else if (errno != EEXIST) {
1151                         ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
1152                         if (orig_fn)
1153                                 unlink(orig_fn);
1154                 }
1155                 /* if buf != NULL then fn is already free and pointing to it */
1156                 if (!buf)
1157                         ast_free(fn);
1158         }
1159
1160         AST_RWLIST_UNLOCK(&formats);
1161
1162         if (!format_found)
1163                 ast_log(LOG_WARNING, "No such format '%s'\n", type);
1164
1165         return fs;
1166 }
1167
1168 /*!
1169  * \brief the core of all waitstream() functions
1170  */
1171 static int waitstream_core(struct ast_channel *c, const char *breakon,
1172         const char *forward, const char *reverse, int skip_ms,
1173         int audiofd, int cmdfd,  const char *context)
1174 {
1175         const char *orig_chan_name = NULL;
1176         int err = 0;
1177
1178         if (!breakon)
1179                 breakon = "";
1180         if (!forward)
1181                 forward = "";
1182         if (!reverse)
1183                 reverse = "";
1184
1185         /* Switch the channel to end DTMF frame only. waitstream_core doesn't care about the start of DTMF. */
1186         ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
1187
1188         if (ast_test_flag(c, AST_FLAG_MASQ_NOSTREAM))
1189                 orig_chan_name = ast_strdupa(c->name);
1190
1191         while (c->stream) {
1192                 int res;
1193                 int ms;
1194
1195                 if (orig_chan_name && strcasecmp(orig_chan_name, c->name)) {
1196                         ast_stopstream(c);
1197                         err = 1;
1198                         break;
1199                 }
1200
1201                 ms = ast_sched_wait(c->sched);
1202
1203                 if (ms < 0 && !c->timingfunc) {
1204                         ast_stopstream(c);
1205                         break;
1206                 }
1207                 if (ms < 0)
1208                         ms = 1000;
1209                 if (cmdfd < 0) {
1210                         res = ast_waitfor(c, ms);
1211                         if (res < 0) {
1212                                 ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
1213                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1214                                 return res;
1215                         }
1216                 } else {
1217                         int outfd;
1218                         struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
1219                         if (!rchan && (outfd < 0) && (ms)) {
1220                                 /* Continue */
1221                                 if (errno == EINTR)
1222                                         continue;
1223                                 ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
1224                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1225                                 return -1;
1226                         } else if (outfd > -1) { /* this requires cmdfd set */
1227                                 /* The FD we were watching has something waiting */
1228                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1229                                 return 1;
1230                         }
1231                         /* if rchan is set, it is 'c' */
1232                         res = rchan ? 1 : 0; /* map into 'res' values */
1233                 }
1234                 if (res > 0) {
1235                         struct ast_frame *fr = ast_read(c);
1236                         if (!fr) {
1237                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1238                                 return -1;
1239                         }
1240                         switch (fr->frametype) {
1241                         case AST_FRAME_DTMF_END:
1242                                 if (context) {
1243                                         const char exten[2] = { fr->subclass.integer, '\0' };
1244                                         if (ast_exists_extension(c, context, exten, 1,
1245                                                 S_COR(c->caller.id.number.valid, c->caller.id.number.str, NULL))) {
1246                                                 res = fr->subclass.integer;
1247                                                 ast_frfree(fr);
1248                                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1249                                                 return res;
1250                                         }
1251                                 } else {
1252                                         res = fr->subclass.integer;
1253                                         if (strchr(forward, res)) {
1254                                                 int eoftest;
1255                                                 ast_stream_fastforward(c->stream, skip_ms);
1256                                                 eoftest = fgetc(c->stream->f);
1257                                                 if (feof(c->stream->f)) {
1258                                                         ast_stream_rewind(c->stream, skip_ms);
1259                                                 } else {
1260                                                         ungetc(eoftest, c->stream->f);
1261                                                 }
1262                                         } else if (strchr(reverse, res)) {
1263                                                 ast_stream_rewind(c->stream, skip_ms);
1264                                         } else if (strchr(breakon, res)) {
1265                                                 ast_frfree(fr);
1266                                                 ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1267                                                 return res;
1268                                         }
1269                                 }
1270                                 break;
1271                         case AST_FRAME_CONTROL:
1272                                 switch (fr->subclass.integer) {
1273                                 case AST_CONTROL_HANGUP:
1274                                 case AST_CONTROL_BUSY:
1275                                 case AST_CONTROL_CONGESTION:
1276                                         ast_frfree(fr);
1277                                         ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1278                                         return -1;
1279                                 case AST_CONTROL_RINGING:
1280                                 case AST_CONTROL_ANSWER:
1281                                 case AST_CONTROL_VIDUPDATE:
1282                                 case AST_CONTROL_SRCUPDATE:
1283                                 case AST_CONTROL_SRCCHANGE:
1284                                 case AST_CONTROL_HOLD:
1285                                 case AST_CONTROL_UNHOLD:
1286                                 case AST_CONTROL_CONNECTED_LINE:
1287                                 case AST_CONTROL_REDIRECTING:
1288                                 case AST_CONTROL_AOC:
1289                                 case -1:
1290                                         /* Unimportant */
1291                                         break;
1292                                 default:
1293                                         ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass.integer);
1294                                 }
1295                                 break;
1296                         case AST_FRAME_VOICE:
1297                                 /* Write audio if appropriate */
1298                                 if (audiofd > -1) {
1299                                         if (write(audiofd, fr->data.ptr, fr->datalen) < 0) {
1300                                                 ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
1301                                         }
1302                                 }
1303                         default:
1304                                 /* Ignore all others */
1305                                 break;
1306                         }
1307                         ast_frfree(fr);
1308                 }
1309                 ast_sched_runq(c->sched);
1310         }
1311
1312         ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
1313
1314         return (err || c->_softhangup) ? -1 : 0;
1315 }
1316
1317 int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *reverse, int ms)
1318 {
1319         return waitstream_core(c, breakon, forward, reverse, ms,
1320                 -1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
1321 }
1322
1323 int ast_waitstream(struct ast_channel *c, const char *breakon)
1324 {
1325         return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
1326 }
1327
1328 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
1329 {
1330         return waitstream_core(c, breakon, NULL, NULL, 0,
1331                 audiofd, cmdfd, NULL /* no context */);
1332 }
1333
1334 int ast_waitstream_exten(struct ast_channel *c, const char *context)
1335 {
1336         /* Waitstream, with return in the case of a valid 1 digit extension */
1337         /* in the current or specified context being pressed */
1338
1339         if (!context)
1340                 context = c->context;
1341         return waitstream_core(c, NULL, NULL, NULL, 0,
1342                 -1, -1, context);
1343 }
1344
1345 /*
1346  * if the file name is non-empty, try to play it.
1347  * Return 0 if success, -1 if error, digit if interrupted by a digit.
1348  * If digits == "" then we can simply check for non-zero.
1349  */
1350 int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
1351 {
1352         int res = 0;
1353         if (!ast_strlen_zero(file)) {
1354                 res = ast_streamfile(chan, file, chan->language);
1355                 if (!res) {
1356                         res = ast_waitstream(chan, digits);
1357                 }
1358         }
1359         return res;
1360 }
1361
1362 char *ast_format_str_reduce(char *fmts)
1363 {
1364         struct ast_format *f;
1365         struct ast_format *fmts_ptr[AST_MAX_FORMATS];
1366         char *fmts_str[AST_MAX_FORMATS];
1367         char *stringp, *type;
1368         char *orig = fmts;
1369         int i, j, x, first, found = 0;
1370         int len = strlen(fmts) + 1;
1371         int res;
1372
1373         if (AST_RWLIST_RDLOCK(&formats)) {
1374                 ast_log(LOG_WARNING, "Unable to lock format list\n");
1375                 return NULL;
1376         }
1377
1378         stringp = ast_strdupa(fmts);
1379
1380         for (x = 0; (type = strsep(&stringp, "|")) && x < AST_MAX_FORMATS; x++) {
1381                 AST_RWLIST_TRAVERSE(&formats, f, list) {
1382                         if (exts_compare(f->exts, type)) {
1383                                 found = 1;
1384                                 break;
1385                         }
1386                 }
1387
1388                 fmts_str[x] = type;
1389                 if (found) {
1390                         fmts_ptr[x] = f;
1391                 } else {
1392                         fmts_ptr[x] = NULL;
1393                 }
1394         }
1395         AST_RWLIST_UNLOCK(&formats);
1396
1397         first = 1;
1398         for (i = 0; i < x; i++) {
1399                 /* ignore invalid entries */
1400                 if (!fmts_ptr[i]) {
1401                         ast_log(LOG_WARNING, "ignoring unknown format '%s'\n", fmts_str[i]);
1402                         continue;
1403                 }
1404
1405                 /* special handling for the first entry */
1406                 if (first) {
1407                         res = snprintf(fmts, len, "%s", fmts_str[i]);
1408                         fmts += res;
1409                         len -= res;
1410                         first = 0;
1411                         continue;
1412                 }
1413
1414                 found = 0;
1415                 for (j = 0; j < i; j++) {
1416                         /* this is a duplicate */
1417                         if (fmts_ptr[j] == fmts_ptr[i]) {
1418                                 found = 1;
1419                                 break;
1420                         }
1421                 }
1422
1423                 if (!found) {
1424                         res = snprintf(fmts, len, "|%s", fmts_str[i]);
1425                         fmts += res;
1426                         len -= res;
1427                 }
1428         }
1429
1430         if (first) {
1431                 ast_log(LOG_WARNING, "no known formats found in format list (%s)\n", orig);
1432                 return NULL;
1433         }
1434
1435         return orig;
1436 }
1437
1438 static char *handle_cli_core_show_file_formats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1439 {
1440 #define FORMAT "%-10s %-10s %-20s\n"
1441 #define FORMAT2 "%-10s %-10s %-20s\n"
1442         struct ast_format *f;
1443         int count_fmt = 0;
1444
1445         switch (cmd) {
1446         case CLI_INIT:
1447                 e->command = "core show file formats";
1448                 e->usage =
1449                         "Usage: core show file formats\n"
1450                         "       Displays currently registered file formats (if any).\n";
1451                 return NULL;
1452         case CLI_GENERATE:
1453                 return NULL;
1454         }
1455
1456         if (a->argc != 4)
1457                 return CLI_SHOWUSAGE;
1458
1459         ast_cli(a->fd, FORMAT, "Format", "Name", "Extensions");
1460         ast_cli(a->fd, FORMAT, "------", "----", "----------");
1461
1462         AST_RWLIST_RDLOCK(&formats);
1463         AST_RWLIST_TRAVERSE(&formats, f, list) {
1464                 ast_cli(a->fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
1465                 count_fmt++;
1466         }
1467         AST_RWLIST_UNLOCK(&formats);
1468         ast_cli(a->fd, "%d file formats registered.\n", count_fmt);
1469         return CLI_SUCCESS;
1470 #undef FORMAT
1471 #undef FORMAT2
1472 }
1473
1474 static struct ast_cli_entry cli_file[] = {
1475         AST_CLI_DEFINE(handle_cli_core_show_file_formats, "Displays file formats")
1476 };
1477
1478 int ast_file_init(void)
1479 {
1480         ast_cli_register_multiple(cli_file, ARRAY_LEN(cli_file));
1481         return 0;
1482 }