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always allocates at least 64 bytes for real, and damages them before free

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This commit is contained in:
Daniel Stenberg 2002-02-28 12:18:15 +00:00
parent 6753c3c715
commit 0cacbc892c
1 changed files with 30 additions and 8 deletions
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38
lib/memdebug.c
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@ -47,6 +47,11 @@
/* DONT include memdebug.h here! */ /* DONT include memdebug.h here! */
struct memdebug {
int size;
char mem[1];
};
/* /*
* Note that these debug functions are very simple and they are meant to * Note that these debug functions are very simple and they are meant to
* remain so. For advanced analysis, record a log file and write perl scripts * remain so. For advanced analysis, record a log file and write perl scripts
@ -67,15 +72,21 @@ void curl_memdebug(const char *logname)
} }
void *curl_domalloc(size_t size, int line, const char *source) void *curl_domalloc(size_t wantedsize, int line, const char *source)
{ {
void *mem=(malloc)(size); void *mem;
size_t size;
/* alloc at least 64 bytes */
size = wantedsize>64?wantedsize:64;
mem=(malloc)(size);
if(mem) if(mem)
/* fill memory with junk */ /* fill memory with junk */
memset(mem, 0xA5, size); memset(mem, 0xA5, size);
if(logfile) if(logfile && source)
fprintf(logfile, "MEM %s:%d malloc(%d) = %p\n", fprintf(logfile, "MEM %s:%d malloc(%d) = %p\n",
source, line, size, mem); source, line, wantedsize, mem);
return mem; return mem;
} }
@ -90,20 +101,28 @@ char *curl_dostrdup(const char *str, int line, const char *source)
exit(2); exit(2);
} }
mem=(strdup)(str);
len=strlen(str)+1; len=strlen(str)+1;
mem=curl_domalloc(len, 0, NULL); /* NULL prevents logging */
memcpy(mem, str, len);
if(logfile) if(logfile)
fprintf(logfile, "MEM %s:%d strdup(%p) (%d) = %p\n", fprintf(logfile, "MEM %s:%d strdup(%p) (%d) = %p\n",
source, line, str, len, mem); source, line, str, len, mem);
return mem; return mem;
} }
void *curl_dorealloc(void *ptr, size_t size, int line, const char *source) void *curl_dorealloc(void *ptr, size_t wantedsize,
int line, const char *source)
{ {
void *mem=(realloc)(ptr, size); void *mem;
size_t size = wantedsize>64?wantedsize:64;
mem=(realloc)(ptr, size);
if(logfile) if(logfile)
fprintf(logfile, "MEM %s:%d realloc(%p, %d) = %p\n", fprintf(logfile, "MEM %s:%d realloc(%p, %d) = %p\n",
source, line, ptr, size, mem); source, line, ptr, wantedsize, mem);
return mem; return mem;
} }
@ -114,7 +133,10 @@ void curl_dofree(void *ptr, int line, const char *source)
source, line); source, line);
exit(2); exit(2);
} }
/* we know this is least 64 bytes, destroy this much */
memset(ptr, 0x13, 64);
/* free for real */
(free)(ptr); (free)(ptr);
if(logfile) if(logfile)