Branch data     Line data    Source code

       1                 :            : /* xmalloc.c -- malloc with out of memory checking
       2                 :            : 
       3                 :            :    Copyright (C) 1990-2000, 2002-2006, 2008-2012 Free Software Foundation, Inc.
       4                 :            : 
       5                 :            :    This program is free software: you can redistribute it and/or modify
       6                 :            :    it under the terms of the GNU General Public License as published by
       7                 :            :    the Free Software Foundation; either version 3 of the License, or
       8                 :            :    (at your option) any later version.
       9                 :            : 
      10                 :            :    This program is distributed in the hope that it will be useful,
      11                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      12                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13                 :            :    GNU General Public License for more details.
      14                 :            : 
      15                 :            :    You should have received a copy of the GNU General Public License
      16                 :            :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      17                 :            : 
      18                 :            : #include <config.h>
      19                 :            : 
      20                 :            : #if ! HAVE_INLINE
      21                 :            : # define static_inline
      22                 :            : #endif
      23                 :            : #include "xalloc.h"
      24                 :            : #undef static_inline
      25                 :            : 
      26                 :            : #include <stdlib.h>
      27                 :            : #include <string.h>
      28                 :            : 
      29                 :            : /* 1 if calloc is known to be compatible with GNU calloc.  This
      30                 :            :    matters if we are not also using the calloc module, which defines
      31                 :            :    HAVE_CALLOC_GNU and supports the GNU API even on non-GNU platforms.  */
      32                 :            : #if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
      33                 :            : enum { HAVE_GNU_CALLOC = 1 };
      34                 :            : #else
      35                 :            : enum { HAVE_GNU_CALLOC = 0 };
      36                 :            : #endif
      37                 :            : 
      38                 :            : /* Allocate N bytes of memory dynamically, with error checking.  */
      39                 :            : 
      40                 :            : void *
      41                 :          0 : xmalloc (size_t n)
      42                 :            : {
      43                 :          0 :   void *p = malloc (n);
      44 [ #  # ][ #  # ]:          0 :   if (!p && n != 0)
      45                 :          0 :     xalloc_die ();
      46                 :          0 :   return p;
      47                 :            : }
      48                 :            : 
      49                 :            : /* Change the size of an allocated block of memory P to N bytes,
      50                 :            :    with error checking.  */
      51                 :            : 
      52                 :            : void *
      53                 :          0 : xrealloc (void *p, size_t n)
      54                 :            : {
      55 [ #  # ][ #  # ]:          0 :   if (!n && p)
      56                 :            :     {
      57                 :            :       /* The GNU and C99 realloc behaviors disagree here.  Act like
      58                 :            :          GNU, even if the underlying realloc is C99.  */
      59                 :          0 :       free (p);
      60                 :          0 :       return NULL;
      61                 :            :     }
      62                 :            : 
      63                 :          0 :   p = realloc (p, n);
      64 [ #  # ][ #  # ]:          0 :   if (!p && n)
      65                 :          0 :     xalloc_die ();
      66                 :          0 :   return p;
      67                 :            : }
      68                 :            : 
      69                 :            : /* If P is null, allocate a block of at least *PN bytes; otherwise,
      70                 :            :    reallocate P so that it contains more than *PN bytes.  *PN must be
      71                 :            :    nonzero unless P is null.  Set *PN to the new block's size, and
      72                 :            :    return the pointer to the new block.  *PN is never set to zero, and
      73                 :            :    the returned pointer is never null.  */
      74                 :            : 
      75                 :            : void *
      76                 :          0 : x2realloc (void *p, size_t *pn)
      77                 :            : {
      78                 :          0 :   return x2nrealloc (p, pn, 1);
      79                 :            : }
      80                 :            : 
      81                 :            : /* Allocate S bytes of zeroed memory dynamically, with error checking.
      82                 :            :    There's no need for xnzalloc (N, S), since it would be equivalent
      83                 :            :    to xcalloc (N, S).  */
      84                 :            : 
      85                 :            : void *
      86                 :          0 : xzalloc (size_t s)
      87                 :            : {
      88                 :          0 :   return memset (xmalloc (s), 0, s);
      89                 :            : }
      90                 :            : 
      91                 :            : /* Allocate zeroed memory for N elements of S bytes, with error
      92                 :            :    checking.  S must be nonzero.  */
      93                 :            : 
      94                 :            : void *
      95                 :          0 : xcalloc (size_t n, size_t s)
      96                 :            : {
      97                 :            :   void *p;
      98                 :            :   /* Test for overflow, since some calloc implementations don't have
      99                 :            :      proper overflow checks.  But omit overflow and size-zero tests if
     100                 :            :      HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
     101                 :            :      returns NULL if successful.  */
     102         [ #  # ]:          0 :   if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
     103                 :            :       || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
     104                 :          0 :     xalloc_die ();
     105                 :          0 :   return p;
     106                 :            : }
     107                 :            : 
     108                 :            : /* Clone an object P of size S, with error checking.  There's no need
     109                 :            :    for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
     110                 :            :    need for an arithmetic overflow check.  */
     111                 :            : 
     112                 :            : void *
     113                 :          0 : xmemdup (void const *p, size_t s)
     114                 :            : {
     115                 :          0 :   return memcpy (xmalloc (s), p, s);
     116                 :            : }
     117                 :            : 
     118                 :            : /* Clone STRING.  */
     119                 :            : 
     120                 :            : char *
     121                 :          0 : xstrdup (char const *string)
     122                 :            : {
     123                 :          0 :   return xmemdup (string, strlen (string) + 1);
     124                 :            : }