Avoid buffer text relocations in calls to STRING_CHAR_* macros.

 src/charset.c (maybe_unify_char): Inhibit relocation of buffer text
 for the duration of call to load_charset, to avoid problems with
 callers of maybe_unify_char that access buffer text through C
 pointers.
 src/ralloc.c (r_alloc_inhibit_buffer_relocation): Increment and
 decrement the inhibition flag, instead of just setting or
 resetting it.

Fixes: debbugs:11519

1 files changed, 6 insertions, 1 deletions

diff --git a/src/ralloc.c b/src/ralloc.c
index db3638a54e..2e4823dc6c 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -1204,7 +1204,12 @@ r_alloc_reset_variable (POINTER *old, POINTER *new)
 void
 r_alloc_inhibit_buffer_relocation (int inhibit)
 {
-  use_relocatable_buffers = !inhibit;
+  if (use_relocatable_buffers < 0)
+    use_relocatable_buffers = 0;
+  if (inhibit)
+    use_relocatable_buffers++;
+  else if (use_relocatable_buffers > 0)
+    use_relocatable_buffers--;
 }