diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/xmalloc.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/lib/xmalloc.c b/lib/xmalloc.c index c1632b96d..6977703b8 100644 --- a/lib/xmalloc.c +++ b/lib/xmalloc.c @@ -1,7 +1,7 @@ /* xmalloc.c -- malloc with out of memory checking Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, - 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc. + 1999, 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -30,6 +30,15 @@ # define SIZE_MAX ((size_t) -1) #endif +/* 1 if calloc is known to be compatible with GNU calloc. This + matters if we are not also using the calloc module, which defines + HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */ +#if defined HAVE_CALLOC || defined __GLIBC__ +enum { HAVE_GNU_CALLOC = 1 }; +#else +enum { HAVE_GNU_CALLOC = 0 }; +#endif + /* Allocate an array of N objects, each with S bytes of memory, dynamically, with error checking. S must be nonzero. */ @@ -204,8 +213,11 @@ xcalloc (size_t n, size_t s) { void *p; /* Test for overflow, since some calloc implementations don't have - proper overflow checks. */ - if (xalloc_oversized (n, s) || (! (p = calloc (n, s)) && n != 0)) + proper overflow checks. But omit overflow and size-zero tests if + HAVE_GNU_CALLOC, since GNU calloc catches overflow and never + returns NULL if successful. */ + if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s)) + || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) xalloc_die (); return p; } |