Line data    Source code

       1             : /* xmalloc.c -- malloc with out of memory checking
       2             : 
       3             :    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
       4             :    1999, 2000, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
       5             :    Inc.
       6             : 
       7             :    This program is free software: you can redistribute it and/or modify
       8             :    it under the terms of the GNU General Public License as published by
       9             :    the Free Software Foundation; either version 3 of the License, or
      10             :    (at your option) any later version.
      11             : 
      12             :    This program is distributed in the hope that it will be useful,
      13             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :    GNU General Public License for more details.
      16             : 
      17             :    You should have received a copy of the GNU General Public License
      18             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      19             : 
      20             : #include <config.h>
      21             : 
      22             : #if ! HAVE_INLINE
      23             : # define static_inline
      24             : #endif
      25             : #include "xalloc.h"
      26             : #undef static_inline
      27             : 
      28             : #include <stdlib.h>
      29             : #include <string.h>
      30             : 
      31             : #ifndef SIZE_MAX
      32             : # define SIZE_MAX ((size_t) -1)
      33             : #endif
      34             : 
      35             : /* 1 if calloc is known to be compatible with GNU calloc.  This
      36             :    matters if we are not also using the calloc module, which defines
      37             :    HAVE_CALLOC and supports the GNU API even on non-GNU platforms.  */
      38             : #if defined HAVE_CALLOC || defined __GLIBC__
      39             : enum { HAVE_GNU_CALLOC = 1 };
      40             : #else
      41             : enum { HAVE_GNU_CALLOC = 0 };
      42             : #endif
      43             : 
      44             : /* Allocate N bytes of memory dynamically, with error checking.  */
      45             : 
      46             : void *
      47       11274 : xmalloc (size_t n)
      48             : {
      49       11274 :   void *p = malloc (n);
      50       11274 :   if (!p && n != 0)
      51           1 :     xalloc_die ();
      52       11273 :   return p;
      53             : }
      54             : 
      55             : /* Change the size of an allocated block of memory P to N bytes,
      56             :    with error checking.  */
      57             : 
      58             : void *
      59        1389 : xrealloc (void *p, size_t n)
      60             : {
      61        1389 :   p = realloc (p, n);
      62        1389 :   if (!p && n != 0)
      63           0 :     xalloc_die ();
      64        1389 :   return p;
      65             : }
      66             : 
      67             : /* If P is null, allocate a block of at least *PN bytes; otherwise,
      68             :    reallocate P so that it contains more than *PN bytes.  *PN must be
      69             :    nonzero unless P is null.  Set *PN to the new block's size, and
      70             :    return the pointer to the new block.  *PN is never set to zero, and
      71             :    the returned pointer is never null.  */
      72             : 
      73             : void *
      74         605 : x2realloc (void *p, size_t *pn)
      75             : {
      76         605 :   return x2nrealloc (p, pn, 1);
      77             : }
      78             : 
      79             : /* Allocate S bytes of zeroed memory dynamically, with error checking.
      80             :    There's no need for xnzalloc (N, S), since it would be equivalent
      81             :    to xcalloc (N, S).  */
      82             : 
      83             : void *
      84         113 : xzalloc (size_t s)
      85             : {
      86         113 :   return memset (xmalloc (s), 0, s);
      87             : }
      88             : 
      89             : /* Allocate zeroed memory for N elements of S bytes, with error
      90             :    checking.  S must be nonzero.  */
      91             : 
      92             : void *
      93         184 : xcalloc (size_t n, size_t s)
      94             : {
      95             :   void *p;
      96             :   /* Test for overflow, since some calloc implementations don't have
      97             :      proper overflow checks.  But omit overflow and size-zero tests if
      98             :      HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
      99             :      returns NULL if successful.  */
     100         184 :   if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
     101             :       || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
     102           0 :     xalloc_die ();
     103         184 :   return p;
     104             : }
     105             : 
     106             : /* Clone an object P of size S, with error checking.  There's no need
     107             :    for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
     108             :    need for an arithmetic overflow check.  */
     109             : 
     110             : void *
     111        5082 : xmemdup (void const *p, size_t s)
     112             : {
     113        5082 :   return memcpy (xmalloc (s), p, s);
     114             : }
     115             : 
     116             : /* Clone STRING.  */
     117             : 
     118             : char *
     119        5066 : xstrdup (char const *string)
     120             : {
     121        5066 :   return xmemdup (string, strlen (string) + 1);
     122             : }