memdebug: remove 9 year old unused debug function

There used to be a way to have memdebug fill allocated memory. 9 years
later this has no value there (valgrind and ASAN etc are way better). If
people need to know about it they can have a look at VCS logs.

Closes #5973

diff --git a/lib/memdebug.c b/lib/memdebug.c
index da75c9f5db43295f795f5da6c06bf8a1b9ebd196..6c56084742125637c1e8f02474502c3f46253210 100644 (file)
--- a/lib/memdebug.c
+++ b/lib/memdebug.c
@@ -35,52 +35,6 @@
 #include "curl_memory.h"
 #include "memdebug.h"
 
-/*
- * Until 2011-08-17 libcurl's Memory Tracking feature also performed
- * automatic malloc and free filling operations using 0xA5 and 0x13
- * values. Our own preinitialization of dynamically allocated memory
- * might be useful when not using third party memory debuggers, but
- * on the other hand this would fool memory debuggers into thinking
- * that all dynamically allocated memory is properly initialized.
- *
- * As a default setting, libcurl's Memory Tracking feature no longer
- * performs preinitialization of dynamically allocated memory on its
- * own. If you know what you are doing, and really want to retain old
- * behavior, you can achieve this compiling with preprocessor symbols
- * CURL_MT_MALLOC_FILL and CURL_MT_FREE_FILL defined with appropriate
- * values.
- */
-
-#ifdef CURL_MT_MALLOC_FILL
-# if (CURL_MT_MALLOC_FILL < 0) || (CURL_MT_MALLOC_FILL > 0xff)
-#   error "invalid CURL_MT_MALLOC_FILL or out of range"
-# endif
-#endif
-
-#ifdef CURL_MT_FREE_FILL
-# if (CURL_MT_FREE_FILL < 0) || (CURL_MT_FREE_FILL > 0xff)
-#   error "invalid CURL_MT_FREE_FILL or out of range"
-# endif
-#endif
-
-#if defined(CURL_MT_MALLOC_FILL) && defined(CURL_MT_FREE_FILL)
-# if (CURL_MT_MALLOC_FILL == CURL_MT_FREE_FILL)
-#   error "CURL_MT_MALLOC_FILL same as CURL_MT_FREE_FILL"
-# endif
-#endif
-
-#ifdef CURL_MT_MALLOC_FILL
-#  define mt_malloc_fill(buf,len) memset((buf), CURL_MT_MALLOC_FILL, (len))
-#else
-#  define mt_malloc_fill(buf,len) Curl_nop_stmt
-#endif
-
-#ifdef CURL_MT_FREE_FILL
-#  define mt_free_fill(buf,len) memset((buf), CURL_MT_FREE_FILL, (len))
-#else
-#  define mt_free_fill(buf,len) Curl_nop_stmt
-#endif
-
 struct memdebug {
   size_t size;
   union {
@@ -173,8 +127,6 @@ void *curl_dbg_malloc(size_t wantedsize, int line, const char *source)
 
   mem = (Curl_cmalloc)(size);
   if(mem) {
-    /* fill memory with junk */
-    mt_malloc_fill(mem->mem, wantedsize);
     mem->size = wantedsize;
   }
 
@@ -321,9 +273,6 @@ void curl_dbg_free(void *ptr, int line, const char *source)
 #  pragma warning(pop)
 #endif
 
-    /* destroy */
-    mt_free_fill(mem->mem, mem->size);
-
     /* free for real */
     (Curl_cfree)(mem);
   }