toolchain/uClibc/patches-0.9.33.2/150-vasprintf_size_reduce.patch

   1 Reduce the initial buffer size for open_memstream (used by vasprintf),
   2 as most strings are usually smaller than that.
   3 Realloc the buffer after finishing the string to further reduce size.
   4
   5 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   6
   7 --- a/libc/stdio/vasprintf.c
   8 +++ b/libc/stdio/vasprintf.c
   9 @@ -39,6 +39,8 @@ int vasprintf(char **__restrict buf, con
  10                 if (rv < 0) {
  11                         free(*buf);
  12                         *buf = NULL;
  13 +               } else {
  14 +                       *buf = realloc(*buf, rv + 1);
  15                 }
  16         }
  17
  18 --- a/libc/stdio/open_memstream.c
  19 +++ b/libc/stdio/open_memstream.c
  20 @@ -17,6 +17,8 @@
  21
  22  #define COOKIE ((__oms_cookie *) cookie)
  23
  24 +#define MEMSTREAM_BUFSIZ       256
  25 +
  26  typedef struct {
  27         char *buf;
  28         size_t len;
  29 @@ -134,7 +136,7 @@ FILE *open_memstream(char **__restrict b
  30         register FILE *fp;
  31
  32         if ((cookie = malloc(sizeof(__oms_cookie))) != NULL) {
  33 -               if ((cookie->buf = malloc(cookie->len = BUFSIZ)) == NULL) {
  34 +               if ((cookie->buf = malloc(cookie->len = MEMSTREAM_BUFSIZ)) == NULL) {
  35                         goto EXIT_cookie;
  36                 }
  37                 *cookie->buf = 0;               /* Set nul terminator for buffer. */