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Annotation of embedaddon/libiconv/srclib/xmalloc.c, revision 1.1

1.1     ! misho       1: /* xmalloc.c -- malloc with out of memory checking
        !             2:    Copyright (C) 1990-1996, 2000-2003, 2005-2007 Free Software Foundation, Inc.
        !             3: 
        !             4:    This program is free software: you can redistribute it and/or modify
        !             5:    it under the terms of the GNU General Public License as published by
        !             6:    the Free Software Foundation; either version 3 of the License, or
        !             7:    (at your option) any later version.
        !             8: 
        !             9:    This program is distributed in the hope that it will be useful,
        !            10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            12:    GNU General Public License for more details.
        !            13: 
        !            14:    You should have received a copy of the GNU General Public License
        !            15:    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
        !            16: 
        !            17: #include <config.h>
        !            18: 
        !            19: /* Specification.  */
        !            20: #include "xalloc.h"
        !            21: 
        !            22: #include <stdlib.h>
        !            23: 
        !            24: #include "error.h"
        !            25: #include "gettext.h"
        !            26: 
        !            27: #define _(str) gettext (str)
        !            28: 
        !            29: 
        !            30: /* Exit value when the requested amount of memory is not available.
        !            31:    The caller may set it to some other value.  */
        !            32: int xmalloc_exit_failure = EXIT_FAILURE;
        !            33: 
        !            34: void
        !            35: xalloc_die ()
        !            36: {
        !            37:   error (xmalloc_exit_failure, 0, _("memory exhausted"));
        !            38:   /* The `noreturn' cannot be given to error, since it may return if
        !            39:      its first argument is 0.  To help compilers understand the
        !            40:      xalloc_die does terminate, call exit. */
        !            41:   exit (EXIT_FAILURE);
        !            42: }
        !            43: 
        !            44: static void *
        !            45: fixup_null_alloc (size_t n)
        !            46: {
        !            47:   void *p;
        !            48: 
        !            49:   p = NULL;
        !            50:   if (n == 0)
        !            51:     p = malloc ((size_t) 1);
        !            52:   if (p == NULL)
        !            53:     xalloc_die ();
        !            54:   return p;
        !            55: }
        !            56: 
        !            57: /* Allocate N bytes of memory dynamically, with error checking.  */
        !            58: 
        !            59: void *
        !            60: xmalloc (size_t n)
        !            61: {
        !            62:   void *p;
        !            63: 
        !            64:   p = malloc (n);
        !            65:   if (p == NULL)
        !            66:     p = fixup_null_alloc (n);
        !            67:   return p;
        !            68: }
        !            69: 
        !            70: /* Allocate memory for NMEMB elements of SIZE bytes, with error checking.
        !            71:    SIZE must be > 0.  */
        !            72: 
        !            73: void *
        !            74: xnmalloc (size_t nmemb, size_t size)
        !            75: {
        !            76:   size_t n;
        !            77:   void *p;
        !            78: 
        !            79:   if (xalloc_oversized (nmemb, size))
        !            80:     xalloc_die ();
        !            81:   n = nmemb * size;
        !            82:   p = malloc (n);
        !            83:   if (p == NULL)
        !            84:     p = fixup_null_alloc (n);
        !            85:   return p;
        !            86: }
        !            87: 
        !            88: /* Allocate SIZE bytes of memory dynamically, with error checking,
        !            89:    and zero it.  */
        !            90: 
        !            91: void *
        !            92: xzalloc (size_t size)
        !            93: {
        !            94:   void *p;
        !            95: 
        !            96:   p = xmalloc (size);
        !            97:   memset (p, 0, size);
        !            98:   return p;
        !            99: }
        !           100: 
        !           101: /* Allocate memory for N elements of S bytes, with error checking,
        !           102:    and zero it.  */
        !           103: 
        !           104: void *
        !           105: xcalloc (size_t n, size_t s)
        !           106: {
        !           107:   void *p;
        !           108: 
        !           109:   p = calloc (n, s);
        !           110:   if (p == NULL)
        !           111:     p = fixup_null_alloc (n);
        !           112:   return p;
        !           113: }
        !           114: 
        !           115: /* Change the size of an allocated block of memory P to N bytes,
        !           116:    with error checking.
        !           117:    If P is NULL, run xmalloc.  */
        !           118: 
        !           119: void *
        !           120: xrealloc (void *p, size_t n)
        !           121: {
        !           122:   if (p == NULL)
        !           123:     return xmalloc (n);
        !           124:   p = realloc (p, n);
        !           125:   if (p == NULL)
        !           126:     p = fixup_null_alloc (n);
        !           127:   return p;
        !           128: }