Annotation of embedaddon/libiconv/srclib/xalloc.h, revision 1.1
1.1 ! misho 1: /* malloc with out of memory checking.
! 2: Copyright (C) 2001-2004, 2006 Free Software Foundation, Inc.
! 3: Written by Bruno Haible <haible@clisp.cons.org>, 2001.
! 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: #ifndef _XALLOC_H
! 19: #define _XALLOC_H
! 20:
! 21: #include <stddef.h>
! 22:
! 23:
! 24: #ifdef __cplusplus
! 25: extern "C" {
! 26: #endif
! 27:
! 28:
! 29: /* Defined in xmalloc.c. */
! 30:
! 31: /* Allocate SIZE bytes of memory dynamically, with error checking. */
! 32: extern void *xmalloc (size_t size);
! 33:
! 34: /* Allocate memory for NMEMB elements of SIZE bytes, with error checking.
! 35: SIZE must be > 0. */
! 36: extern void *xnmalloc (size_t nmemb, size_t size);
! 37:
! 38: /* Allocate SIZE bytes of memory dynamically, with error checking,
! 39: and zero it. */
! 40: extern void *xzalloc (size_t size);
! 41:
! 42: /* Allocate memory for NMEMB elements of SIZE bytes, with error checking,
! 43: and zero it. */
! 44: extern void *xcalloc (size_t nmemb, size_t size);
! 45:
! 46: /* Change the size of an allocated block of memory PTR to SIZE bytes,
! 47: with error checking. If PTR is NULL, run xmalloc. */
! 48: extern void *xrealloc (void *ptr, size_t size);
! 49: #ifdef __cplusplus
! 50: }
! 51: template <typename T>
! 52: inline T * xrealloc (T * ptr, size_t size)
! 53: {
! 54: return (T *) xrealloc ((void *) ptr, size);
! 55: }
! 56: extern "C" {
! 57: #endif
! 58:
! 59: /* This function is always triggered when memory is exhausted. It is
! 60: in charge of honoring the three previous items. This is the
! 61: function to call when one wants the program to die because of a
! 62: memory allocation failure. */
! 63: extern void xalloc_die (void)
! 64: #if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)) && !__STRICT_ANSI__
! 65: __attribute__ ((__noreturn__))
! 66: #endif
! 67: ;
! 68:
! 69: /* In the following macros, T must be an elementary or structure/union or
! 70: typedef'ed type, or a pointer to such a type. To apply one of the
! 71: following macros to a function pointer or array type, you need to typedef
! 72: it first and use the typedef name. */
! 73:
! 74: /* Allocate an object of type T dynamically, with error checking. */
! 75: /* extern T *XMALLOC (typename T); */
! 76: #define XMALLOC(T) \
! 77: ((T *) xmalloc (sizeof (T)))
! 78:
! 79: /* Allocate memory for NMEMB elements of type T, with error checking. */
! 80: /* extern T *XNMALLOC (size_t nmemb, typename T); */
! 81: #if HAVE_INLINE
! 82: /* xnmalloc performs a division and multiplication by sizeof (T). Arrange to
! 83: perform the division at compile-time and the multiplication with a factor
! 84: known at compile-time. */
! 85: # define XNMALLOC(N,T) \
! 86: ((T *) (sizeof (T) == 1 \
! 87: ? xmalloc (N) \
! 88: : xnboundedmalloc(N, (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / sizeof (T), sizeof (T))))
! 89: static inline void *
! 90: xnboundedmalloc (size_t n, size_t bound, size_t s)
! 91: {
! 92: if (n > bound)
! 93: xalloc_die ();
! 94: return xmalloc (n * s);
! 95: }
! 96: #else
! 97: # define XNMALLOC(N,T) \
! 98: ((T *) (sizeof (T) == 1 ? xmalloc (N) : xnmalloc (N, sizeof (T))))
! 99: #endif
! 100:
! 101: /* Allocate an object of type T dynamically, with error checking,
! 102: and zero it. */
! 103: /* extern T *XZALLOC (typename T); */
! 104: #define XZALLOC(T) \
! 105: ((T *) xzalloc (sizeof (T)))
! 106:
! 107: /* Allocate memory for NMEMB elements of type T, with error checking,
! 108: and zero it. */
! 109: /* extern T *XCALLOC (size_t nmemb, typename T); */
! 110: #define XCALLOC(N,T) \
! 111: ((T *) xcalloc (N, sizeof (T)))
! 112:
! 113: /* Return a pointer to a new buffer of N bytes. This is like xmalloc,
! 114: except it returns char *. */
! 115: #define xcharalloc(N) \
! 116: XNMALLOC (N, char)
! 117:
! 118:
! 119: /* Defined in xstrdup.c. */
! 120:
! 121: /* Return a newly allocated copy of the N bytes of memory starting at P. */
! 122: extern void *xmemdup (const void *p, size_t n);
! 123: #ifdef __cplusplus
! 124: }
! 125: template <typename T>
! 126: inline T * xmemdup (const T * p, size_t n)
! 127: {
! 128: return (T *) xmemdup ((const void *) p, n);
! 129: }
! 130: extern "C" {
! 131: #endif
! 132:
! 133: /* Return a newly allocated copy of STRING. */
! 134: extern char *xstrdup (const char *string);
! 135:
! 136:
! 137: /* Return 1 if an array of N objects, each of size S, cannot exist due
! 138: to size arithmetic overflow. S must be positive and N must be
! 139: nonnegative. This is a macro, not an inline function, so that it
! 140: works correctly even when SIZE_MAX < N.
! 141:
! 142: By gnulib convention, SIZE_MAX represents overflow in size
! 143: calculations, so the conservative dividend to use here is
! 144: SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
! 145: However, malloc (SIZE_MAX) fails on all known hosts where
! 146: sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
! 147: exactly-SIZE_MAX allocations on such hosts; this avoids a test and
! 148: branch when S is known to be 1. */
! 149: # define xalloc_oversized(n, s) \
! 150: ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
! 151:
! 152:
! 153: #ifdef __cplusplus
! 154: }
! 155: #endif
! 156:
! 157:
! 158: #endif /* _XALLOC_H */
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