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y4minput: add more error reporting on read failure

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Change-Id: Iedb136e4019ec3eb3005ea567efb33902dccfb8d
This commit is contained in:
James Zern 2014-03-15 12:35:44 -07:00
parent 17d2394c43
commit d5866987ff
1 changed files with 11 additions and 3 deletions
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14
y4minput.c
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@ -22,13 +22,14 @@
static int file_read(void *buf, size_t size, FILE *file) {
const int kMaxRetries = 5;
int retry_count = 0;
int file_error;
size_t len = 0;
do {
const size_t n = fread((uint8_t*)buf + len, 1, size - len, file);
len += n;
if (ferror(file)) {
file_error = ferror(file);
if (file_error) {
if (errno == EINTR || errno == EAGAIN) {
++retry_count;
clearerr(file);
continue;
} else {
@ -37,7 +38,14 @@ static int file_read(void *buf, size_t size, FILE *file) {
return 0;
}
}
} while (!feof(file) && len < size && retry_count < kMaxRetries);
} while (!feof(file) && len < size && ++retry_count < kMaxRetries);
if (!feof(file) && len != size) {
fprintf(stderr, "Error reading file: %u of %u bytes read,"
" error: %d, retries: %d, %d: %s\n",
(uint32_t)len, (uint32_t)size, file_error, retry_count,
errno, strerror(errno));
}
return len == size;
}