check return value

OSGeo · Oct 2, 2024 · 6a71726 · 6a71726
1 parent 33d0d15
commit 6a71726
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/raster/r.thin/io.c b/raster/r.thin/io.c
@@ -67,13 +67,17 @@ int put_a_row(int row, CELL *buf)
 
 static int read_row(int file, void *buf, int row, int buf_len)
 {
- lseek(file, ((off_t)row) * buf_len, 0);
+ if (lseek(file, ((off_t)row) * buf_len, 0) == -1) {
+ G_fatal_error(_("Unable to seek: %s"), strerror(errno));
+ }
  return (read(file, buf, buf_len) == buf_len);
 }
 
 static int write_row(int file, const void *buf, int row, int buf_len)
 {
- lseek(file, ((off_t)row) * buf_len, 0);
+ if (lseek(file, ((off_t)row) * buf_len, 0) == -1) {
+ G_fatal_error(_("Unable to seek: %s"), strerror(errno));
+ }
  return (write(file, buf, buf_len) == buf_len);
 }