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tools/trasher: Check fseek returns 

Fixes CID733726

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-22 16:49:56 +01:00
parent c3b6454d80
commit ca86e91dd6
1 changed files with 12 additions and 6 deletions
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18
tools/trasher.c
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@ -30,6 +30,15 @@ static uint32_t ran(void)
return state = state * 1664525 + 1013904223;
}
static void checked_seek(FILE *stream, int64_t offset, int whence)
{
offset = fseek(stream, offset, whence);
if (offset < 0) {
fprintf(stderr, "seek failed\n");
exit(1);
}
}
int main(int argc, char **argv)
{
FILE *f;
@ -49,17 +58,14 @@ int main(int argc, char **argv)
maxburst = atoi(argv[3]);
state = atoi(argv[4]);
fseek(f, 0, SEEK_END);
checked_seek(f, 0, SEEK_END);
length = ftell(f);
fseek(f, 0, SEEK_SET);
checked_seek(f, 0, SEEK_SET);
while (count--) {
int burst = 1 + ran() * (uint64_t) (abs(maxburst) - 1) / UINT32_MAX;
int pos = ran() * (uint64_t) length / UINT32_MAX;
if (fseek(f, pos, SEEK_SET) < 0) {
fprintf(stderr, "seek failed\n");
return 1;
}
checked_seek(f, pos, SEEK_SET);
if (maxburst < 0)
burst = -maxburst;