lib/xalloc.h

   1 /* xalloc.h -- malloc with out-of-memory checking
   2
   3    Copyright (C) 1990-2000, 2003-2004, 2006-2024 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 <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef XALLOC_H_
  19 #define XALLOC_H_
  20
  21 /* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _Noreturn,
  22    _GL_ATTRIBUTE_ALLOC_SIZE, _GL_ATTRIBUTE_MALLOC,
  23    _GL_ATTRIBUTE_RETURNS_NONNULL.  */
  24 #if !_GL_CONFIG_H_INCLUDED
  25  #error "Please include config.h first."
  26 #endif
  27
  28 #include <stddef.h>
  29 #include <stdlib.h>
  30
  31 #if GNULIB_XALLOC
  32 # include "idx.h"
  33 #endif
  34
  35 _GL_INLINE_HEADER_BEGIN
  36 #ifndef XALLOC_INLINE
  37 # define XALLOC_INLINE _GL_INLINE
  38 #endif
  39
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45
  46 #if GNULIB_XALLOC_DIE
  47
  48 /* This function is always triggered when memory is exhausted.
  49    It must be defined by the application, either explicitly
  50    or by using gnulib's xalloc-die module.  This is the
  51    function to call when one wants the program to die because of a
  52    memory allocation failure.  */
  53 _Noreturn void xalloc_die (void);
  54
  55 #endif /* GNULIB_XALLOC_DIE */
  56
  57 #if GNULIB_XALLOC
  58
  59 void *xmalloc (size_t s)
  60   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  61   _GL_ATTRIBUTE_ALLOC_SIZE ((1)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  62 void *ximalloc (idx_t s)
  63   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  64   _GL_ATTRIBUTE_ALLOC_SIZE ((1)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  65 void *xinmalloc (idx_t n, idx_t s)
  66   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  67   _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  68 void *xzalloc (size_t s)
  69   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  70   _GL_ATTRIBUTE_ALLOC_SIZE ((1)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  71 void *xizalloc (idx_t s)
  72   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  73   _GL_ATTRIBUTE_ALLOC_SIZE ((1)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  74 void *xcalloc (size_t n, size_t s)
  75   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  76   _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  77 void *xicalloc (idx_t n, idx_t s)
  78   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  79   _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  80 void *xrealloc (void *p, size_t s)
  81   _GL_ATTRIBUTE_ALLOC_SIZE ((2));
  82 void *xirealloc (void *p, idx_t s)
  83   _GL_ATTRIBUTE_ALLOC_SIZE ((2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  84 void *xreallocarray (void *p, size_t n, size_t s)
  85   _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3));
  86 void *xireallocarray (void *p, idx_t n, idx_t s)
  87   _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  88 void *x2realloc (void *p, size_t *ps) /* superseded by xpalloc */
  89   _GL_ATTRIBUTE_RETURNS_NONNULL;
  90 void *x2nrealloc (void *p, size_t *pn, size_t s) /* superseded by xpalloc */
  91   _GL_ATTRIBUTE_RETURNS_NONNULL;
  92 void *xpalloc (void *pa, idx_t *pn, idx_t n_incr_min, ptrdiff_t n_max, idx_t s)
  93   _GL_ATTRIBUTE_RETURNS_NONNULL;
  94 void *xmemdup (void const *p, size_t s)
  95   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  96   _GL_ATTRIBUTE_ALLOC_SIZE ((2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
  97 void *ximemdup (void const *p, idx_t s)
  98   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  99   _GL_ATTRIBUTE_ALLOC_SIZE ((2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
 100 char *ximemdup0 (void const *p, idx_t s)
 101   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
 102   _GL_ATTRIBUTE_RETURNS_NONNULL;
 103 char *xstrdup (char const *str)
 104   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
 105   _GL_ATTRIBUTE_RETURNS_NONNULL;
 106
 107 /* In the following macros, T must be an elementary or structure/union or
 108    typedef'ed type, or a pointer to such a type.  To apply one of the
 109    following macros to a function pointer or array type, you need to typedef
 110    it first and use the typedef name.  */
 111
 112 /* Allocate an object of type T dynamically, with error checking.  */
 113 /* extern t *XMALLOC (typename t); */
 114 # define XMALLOC(t) ((t *) xmalloc (sizeof (t)))
 115
 116 /* Allocate memory for N elements of type T, with error checking.  */
 117 /* extern t *XNMALLOC (size_t n, typename t); */
 118 # define XNMALLOC(n, t) \
 119     ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
 120
 121 /* Allocate an object of type T dynamically, with error checking,
 122    and zero it.  */
 123 /* extern t *XZALLOC (typename t); */
 124 # define XZALLOC(t) ((t *) xzalloc (sizeof (t)))
 125
 126 /* Allocate memory for N elements of type T, with error checking,
 127    and zero it.  */
 128 /* extern t *XCALLOC (size_t n, typename t); */
 129 # define XCALLOC(n, t) \
 130     ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
 131
 132
 133 /* Allocate an array of N objects, each with S bytes of memory,
 134    dynamically, with error checking.  S must be nonzero.  */
 135
 136 void *xnmalloc (size_t n, size_t s)
 137   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
 138   _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)) _GL_ATTRIBUTE_RETURNS_NONNULL;
 139
 140 /* FIXME: Deprecate this in favor of xreallocarray?  */
 141 /* Change the size of an allocated block of memory P to an array of N
 142    objects each of S bytes, with error checking.  S must be nonzero.  */
 143
 144 XALLOC_INLINE void *xnrealloc (void *p, size_t n, size_t s)
 145   _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3));
 146 XALLOC_INLINE void *
 147 xnrealloc (void *p, size_t n, size_t s)
 148 {
 149   return xreallocarray (p, n, s);
 150 }
 151
 152 /* Return a pointer to a new buffer of N bytes.  This is like xmalloc,
 153    except it returns char *.  */
 154
 155 char *xcharalloc (size_t n)
 156   _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
 157   _GL_ATTRIBUTE_ALLOC_SIZE ((1)) _GL_ATTRIBUTE_RETURNS_NONNULL;
 158
 159 #endif /* GNULIB_XALLOC */
 160
 161
 162 #ifdef __cplusplus
 163 }
 164 #endif
 165
 166
 167 #if GNULIB_XALLOC && defined __cplusplus
 168
 169 /* C++ does not allow conversions from void * to other pointer types
 170    without a cast.  Use templates to work around the problem when
 171    possible.  */
 172
 173 template <typename T> inline T *
 174 xrealloc (T *p, size_t s)
 175 {
 176   return (T *) xrealloc ((void *) p, s);
 177 }
 178
 179 template <typename T> inline T *
 180 xreallocarray (T *p, size_t n, size_t s)
 181 {
 182   return (T *) xreallocarray ((void *) p, n, s);
 183 }
 184
 185 /* FIXME: Deprecate this in favor of xreallocarray?  */
 186 template <typename T> inline T *
 187 xnrealloc (T *p, size_t n, size_t s)
 188 {
 189   return xreallocarray (p, n, s);
 190 }
 191
 192 template <typename T> inline T *
 193 x2realloc (T *p, size_t *pn)
 194 {
 195   return (T *) x2realloc ((void *) p, pn);
 196 }
 197
 198 template <typename T> inline T *
 199 x2nrealloc (T *p, size_t *pn, size_t s)
 200 {
 201   return (T *) x2nrealloc ((void *) p, pn, s);
 202 }
 203
 204 template <typename T> inline T *
 205 xmemdup (T const *p, size_t s)
 206 {
 207   return (T *) xmemdup ((void const *) p, s);
 208 }
 209
 210 #endif /* GNULIB_XALLOC && C++ */
 211
 212
 213 _GL_INLINE_HEADER_END
 214
 215 #endif /* !XALLOC_H_ */