if (off + len <= SB_BUFFER_SIZE) {
if (id->sbbuf == NULL) {
id->sbbuf = malloc(SB_BUFFER_SIZE);
- if (id->sbbuf == NULL)
+ if (id->sbbuf == NULL) {
+ dbg("error malloc");
return NULL;
+ }
}
/* check if we need to read */
if ((off + len) > id->sbbuf_len) {
dbg("read sbbuf len:0x%llx", (unsigned long long) (off + len));
- lseek(id->fd, 0, SEEK_SET);
+ if (lseek(id->fd, 0, SEEK_SET) < 0) {
+ dbg("lseek failed (%s)", strerror(errno));
+ return NULL;
+ }
buf_len = read(id->fd, id->sbbuf, off + len);
+ if (buf_len < 0) {
+ dbg("read failed (%s)", strerror(errno));
+ return NULL;
+ }
dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
id->sbbuf_len = buf_len;
- if (buf_len < off + len)
+ if (buf_len < off + len) {
+ dbg("requested 0x%zx bytes, got only 0x%zx bytes", len, buf_len);
return NULL;
+ }
}
return &(id->sbbuf[off]);
/* get seek buffer */
if (id->seekbuf == NULL) {
id->seekbuf = malloc(SEEK_BUFFER_SIZE);
- if (id->seekbuf == NULL)
+ if (id->seekbuf == NULL) {
+ dbg("error malloc");
return NULL;
+ }
}
/* check if we need to read */
if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
dbg("read seekbuf off:0x%llx len:0x%zx", (unsigned long long) off, len);
- if (lseek(id->fd, off, SEEK_SET) == -1)
+ if (lseek(id->fd, off, SEEK_SET) < 0) {
+ dbg("lseek failed (%s)", strerror(errno));
return NULL;
+ }
buf_len = read(id->fd, id->seekbuf, len);
+ if (buf_len < 0) {
+ dbg("read failed (%s)", strerror(errno));
+ return NULL;
+ }
dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
id->seekbuf_off = off;
id->seekbuf_len = buf_len;