Unverified Commit 992083b1 authored by Marcel Raad's avatar Marcel Raad
Browse files

examples/fopen: fix comparison 

As want is size_t, (file->buffer_pos - want) is unsigned, so checking
if it's less than zero makes no sense.
Check if file->buffer_pos is less than want instead to avoid the
unsigned integer wraparound.

Closes https://github.com/curl/curl/pull/3975
parent e23c52b3

docs/examples/fopen.c

+1 −1
Original line number Diff line number Diff line
@@ -211,7 +211,7 @@ static int fill_buffer(URL_FILE *file, size_t want) 
static int use_buffer(URL_FILE *file, size_t want)

{

  /* sort out buffer */

  if((file->buffer_pos - want) <= 0) {

  if(file->buffer_pos <= want) {

    /* ditch buffer - write will recreate */

    free(file->buffer);

    file->buffer = NULL;