Fix alloc_realloc UB

 void ** does not exist: the address of a generic pointer is not
properly defined (different pointer types may have different
representations). So, alloc_realloc cannot exist as is without UB.
Fortunately, it's not supposed to be used in the skalibs programming
style, and skalibs itself only uses it in two places
(stralloc_ready_tuned and stralloc_shrink) where the pointer is a
char *.
 So we just fix the UB by making alloc_realloc() take a char **,
and it's only defined for that pointer type.
 Nothing to see here folks, nothing happened at all.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstddjb/alloc_realloc.c b/src/libstddjb/alloc_realloc.c
index 8787291..82be92b 100644
--- a/src/libstddjb/alloc_realloc.c
+++ b/src/libstddjb/alloc_realloc.c
@@ -3,9 +3,9 @@
 #include <stdlib.h>
 #include <skalibs/alloc.h>
 
-int alloc_realloc (void **x, size_t n)
+int alloc_realloc (char **x, size_t n)
 {
-  void *y = n ? realloc(*x, n) : (free(*x), alloc(0)) ;
+  char *y = n ? (char *)realloc(*x, n) : (free(*x), (char *)alloc(0)) ;
   if (!y) return 0 ;
   *x = y ;
   return 1 ;