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cleanup: Fix fread() and fwrite() error handling 

Cleaned up some of the incorrect uses of fread() and fwrite(), mostly in
the format modules. Neither of these functions will ever return a value
less than 0, which we were checking for in some cases.

I've introduced a fair amount of duplication in the format modules, but
I plan to change how format modules work internally in a subsequent
patch set, so this is simply a stop-gap.

Change-Id: I8ca1cd47c20b2c0b72088bd13b9046f6977aa872
This commit is contained in:
Sean Bright 2017-04-21 13:04:44 -04:00
parent 8df729517e
commit f5b67871df
19 changed files with 198 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
addons/format_mp3.c
View File

@ -118,9 +118,11 @@ static int mp3_squeue(struct ast_filestream *s)
res = ftell(s->f);
p->sbuflen = fread(p->sbuf, 1, MP3_SCACHE, s->f);
if(p->sbuflen < 0) {
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", p->sbuflen, strerror(errno));
return -1;
if (p->sbuflen < MP3_SCACHE) {
if (ferror(s->f)) {
ast_log(LOG_WARNING, "Error while reading MP3 file: %s\n", strerror(errno));
return -1;
}
}
res = decodeMP3(&p->mp,p->sbuf,p->sbuflen,p->dbuf,MP3_DCACHE,&p->dbuflen);
if(res != MP3_OK)

14
apps/app_minivm.c
View File

@ -854,16 +854,16 @@ static int b64_inbuf(struct b64_baseio *bio, FILE *fi)
if (bio->ateof)
return 0;
if ((l = fread(bio->iobuf, 1, B64_BASEMAXINLINE,fi)) <= 0) {
if (ferror(fi))
return -1;
if ((l = fread(bio->iobuf, 1, B64_BASEMAXINLINE, fi)) != B64_BASEMAXINLINE) {
bio->ateof = 1;
return 0;
if (l == 0) {
/* Assume EOF */
return 0;
}
}
bio->iolen= l;
bio->iocp= 0;
bio->iolen = l;
bio->iocp = 0;
return 1;
}

14
apps/app_voicemail.c
View File

@ -2728,9 +2728,9 @@ static int imap_store_file(const char *dir, const char *mailboxuser, const char
*(vmu->email) = '\0';
return -1;
}
if (fread(buf, len, 1, p) < len) {
if (fread(buf, 1, len, p) != len) {
if (ferror(p)) {
ast_log(LOG_ERROR, "Short read while reading in mail file.\n");
ast_log(LOG_ERROR, "Error while reading mail file: %s\n");
return -1;
}
}
@ -4743,12 +4743,12 @@ static int inbuf(struct baseio *bio, FILE *fi)
if (bio->ateof)
return 0;
if ((l = fread(bio->iobuf, 1, BASEMAXINLINE, fi)) <= 0) {
if (ferror(fi))
return -1;
if ((l = fread(bio->iobuf, 1, BASEMAXINLINE, fi)) != BASEMAXINLINE) {
bio->ateof = 1;
return 0;
if (l == 0) {
/* Assume EOF */
return 0;
}
}
bio->iolen = l;

12
formats/format_g719.c
View File

@ -45,8 +45,16 @@ static struct ast_frame *g719read(struct ast_filestream *s, int *whennext)
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = BYTES_TO_SAMPLES(res);

13
formats/format_g723.c
View File

@ -64,8 +64,17 @@ static struct ast_frame *g723_read(struct ast_filestream *s, int *whennext)
}
/* Read the data into the buffer */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != size) {
ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = 240;

12
formats/format_g726.c
View File

@ -124,8 +124,16 @@ static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, frame_size[fs->rate]);
s->fr.samples = 8 * FRAME_TIME;
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples;

12
formats/format_g729.c
View File

@ -51,8 +51,16 @@ static struct ast_frame *g729_read(struct ast_filestream *s, int *whennext)
s->fr.samples = G729A_SAMPLES;
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res && (res != 10)) /* XXX what for ? */
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples;

16
formats/format_gsm.c
View File

@ -55,10 +55,18 @@ static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
{
int res;
AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE)
AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE);
if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), GSM_FRAME_SIZE, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = GSM_SAMPLES;
@ -131,7 +139,7 @@ static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
int i;
fseeko(fs->f, 0, SEEK_END);
for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) {
if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) {
if (fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f) != GSM_FRAME_SIZE) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
}

16
formats/format_h263.c
View File

@ -58,7 +58,7 @@ static int h263_open(struct ast_filestream *s)
{
unsigned int ts;
if (fread(&ts, 1, sizeof(ts), s->f) < sizeof(ts)) {
if (fread(&ts, 1, sizeof(ts), s->f) != sizeof(ts)) {
ast_log(LOG_WARNING, "Empty file!\n");
return -1;
}
@ -74,7 +74,7 @@ static struct ast_frame *h263_read(struct ast_filestream *s, int *whennext)
struct h263_desc *fs = (struct h263_desc *)s->_private;
/* Send a frame from the file to the appropriate channel */
if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
if ((res = fread(&len, 1, sizeof(len), s->f)) != sizeof(len))
return NULL;
len = ntohs(len);
mark = (len & FRAME_ENDED) ? 1 : 0;
@ -85,8 +85,16 @@ static struct ast_frame *h263_read(struct ast_filestream *s, int *whennext)
}
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
s->fr.samples = fs->lastts; /* XXX what ? */

16
formats/format_h264.c
View File

@ -50,7 +50,7 @@ struct h264_desc {
static int h264_open(struct ast_filestream *s)
{
unsigned int ts;
if (fread(&ts, 1, sizeof(ts), s->f) < sizeof(ts)) {
if (fread(&ts, 1, sizeof(ts), s->f) != sizeof(ts)) {
ast_log(LOG_WARNING, "Empty file!\n");
return -1;
}
@ -66,7 +66,7 @@ static struct ast_frame *h264_read(struct ast_filestream *s, int *whennext)
struct h264_desc *fs = (struct h264_desc *)s->_private;
/* Send a frame from the file to the appropriate channel */
if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
if ((res = fread(&len, 1, sizeof(len), s->f)) != sizeof(len))
return NULL;
len = ntohs(len);
mark = (len & FRAME_ENDED) ? 1 : 0;
@ -77,8 +77,16 @@ static struct ast_frame *h264_read(struct ast_filestream *s, int *whennext)
}
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
s->fr.samples = fs->lastts;

12
formats/format_ilbc.c
View File

@ -49,8 +49,16 @@ static struct ast_frame *ilbc_read(struct ast_filestream *s, int *whennext)
/* Send a frame from the file to the appropriate channel */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = ILBC_SAMPLES;

10
formats/format_ogg_vorbis.c
View File

@ -181,10 +181,10 @@ static int ogg_vorbis_rewrite(struct ast_filestream *s,
while (!tmp->eos) {
if (ogg_stream_flush(&tmp->os, &tmp->og) == 0)
break;
if (!fwrite(tmp->og.header, 1, tmp->og.header_len, s->f)) {
if (fwrite(tmp->og.header, 1, tmp->og.header_len, s->f) != tmp->og.header_len) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
if (!fwrite(tmp->og.body, 1, tmp->og.body_len, s->f)) {
if (fwrite(tmp->og.body, 1, tmp->og.body_len, s->f) != tmp->og.body_len) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
if (ogg_page_eos(&tmp->og))
@ -211,10 +211,10 @@ static void write_stream(struct ogg_vorbis_desc *s, FILE *f)
if (ogg_stream_pageout(&s->os, &s->og) == 0) {
break;
}
if (!fwrite(s->og.header, 1, s->og.header_len, f)) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
if (fwrite(s->og.header, 1, s->og.header_len, f) != s->og.header_len) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
if (!fwrite(s->og.body, 1, s->og.body_len, f)) {
if (fwrite(s->og.body, 1, s->og.body_len, f) != s->og.body_len) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
if (ogg_page_eos(&s->og)) {

24
formats/format_pcm.c
View File

@ -83,9 +83,17 @@ static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
/* Send a frame from the file to the appropriate channel */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
s->fr.datalen = res;
@ -140,9 +148,10 @@ static int pcm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
const char *src = (ast_format_cmp(fs->fmt->format, ast_format_alaw) == AST_FORMAT_CMP_EQUAL) ? alaw_silence : ulaw_silence;
while (left) {
size_t written = fwrite(src, 1, (left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
if (written == -1)
size_t written = fwrite(src, 1, MIN(left, BUF_SIZE), fs->f);
if (written < MIN(left, BUF_SIZE)) {
break; /* error */
}
left -= written;
}
ret = 0; /* successful */
@ -210,7 +219,10 @@ static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
to_write = fpos - cur;
if (to_write > sizeof(buf))
to_write = sizeof(buf);
fwrite(buf, 1, to_write, fs->f);
if (fwrite(buf, 1, to_write, fs->f) != to_write) {
ast_log(LOG_ERROR, "Failed to write to file: %s\n", strerror(errno));
return -1;
}
cur += to_write;
}
}

12
formats/format_siren14.c
View File

@ -45,8 +45,16 @@ static struct ast_frame *siren14read(struct ast_filestream *s, int *whennext)
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = BYTES_TO_SAMPLES(res);

12
formats/format_siren7.c
View File

@ -45,8 +45,16 @@ static struct ast_frame *siren7read(struct ast_filestream *s, int *whennext)
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = BYTES_TO_SAMPLES(res);

14
formats/format_sln.c
View File

@ -38,9 +38,17 @@ static struct ast_frame *generic_read(struct ast_filestream *s, int *whennext, u
/* Send a frame from the file to the appropriate channel */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, buf_size);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = res/2;

14
formats/format_vox.c
View File

@ -44,9 +44,17 @@ static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
/* Send a frame from the file to the appropriate channel */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
*whennext = s->fr.samples = res * 2;

23
formats/format_wav.c
View File

@ -361,7 +361,7 @@ static void wav_close(struct ast_filestream *s)
/* Pad to even length */
if (fs->bytes & 0x1) {
if (!fwrite(&zero, 1, 1, s->f)) {
if (fwrite(&zero, 1, 1, s->f) != 1) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
}
@ -385,14 +385,23 @@ static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
here = ftello(s->f);
if (fs->maxlen - here < bytes) /* truncate if necessary */
bytes = fs->maxlen - here;
if (bytes < 0)
bytes = 0;
if (bytes <= 0) {
return NULL;
}
/* ast_debug(1, "here: %d, maxlen: %d, bytes: %d\n", here, s->maxlen, bytes); */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes);
if ( (res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) <= 0 ) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
s->fr.datalen = res;

14
formats/format_wav_gsm.c
View File

@ -422,8 +422,16 @@ static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
int res;
if ((res = fread(msdata, 1, MSGSM_FRAME_SIZE, s->f)) != MSGSM_FRAME_SIZE) {
if (res && (res != 1))
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), MSGSM_FRAME_SIZE, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
/* Convert from MS format to two real GSM frames */
@ -511,7 +519,7 @@ static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
int i;
fseek(fs->f, 0, SEEK_END);
for (i=0; i< (offset - max) / MSGSM_FRAME_SIZE; i++) {
if (!fwrite(msgsm_silence, 1, MSGSM_FRAME_SIZE, fs->f)) {
if (fwrite(msgsm_silence, 1, MSGSM_FRAME_SIZE, fs->f) != MSGSM_FRAME_SIZE) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
}