Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/eealloc.h @ 10074:cf0a8e173c39
Help GCC to do better code generation.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 15 May 2008 02:01:46 +0200 |
| parents | bbbbbf4cd1c5 |
| children | b5e42ef33b49 |
| rev | line source |
|---|---|
| 4919 | 1 /* Memory allocation with expensive empty allocations. |
|
10074
cf0a8e173c39
Help GCC to do better code generation.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
2 Copyright (C) 2003, 2008 Free Software Foundation, Inc. |
| 4919 | 3 Written by Bruno Haible <bruno@clisp.org>, 2003, |
| 4 based on prior work by Jim Meyering. | |
| 5 | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
5848
diff
changeset
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6 This program is free software: you can redistribute it and/or modify |
| 4919 | 7 it under the terms of the GNU General Public License as published by |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
5848
diff
changeset
|
8 the Free Software Foundation; either version 3 of the License, or |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
5848
diff
changeset
|
9 (at your option) any later version. |
| 4919 | 10 |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
5848
diff
changeset
|
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 4919 | 18 |
| 19 #ifndef _EEALLOC_H | |
| 20 #define _EEALLOC_H | |
| 21 | |
| 22 /* malloc() and realloc() are allowed to return NULL when asked to allocate | |
| 23 a memory block of 0 bytes; this is not an out-of-memory condition. | |
| 24 (See ISO C 99 section 7.20.3.) In some places, this is not welcome, | |
| 25 because it requires extra checking (so as not to confuse a zero-sized | |
| 26 allocation with an out-of-memory condition). This file provides | |
| 27 malloc()/realloc() workalikes which return non-NULL pointers for | |
| 28 succeeding zero-sized allocations. GNU libc already defines malloc() | |
| 29 and realloc() this way; on such platforms the workalikes are aliased | |
| 30 to the original malloc()/realloc() functions. */ | |
| 31 | |
| 32 #include <stdlib.h> | |
| 33 | |
| 34 #if MALLOC_0_IS_NONNULL | |
| 35 # define eemalloc malloc | |
| 36 #else | |
|
10074
cf0a8e173c39
Help GCC to do better code generation.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
37 # if __GNUC__ >= 3 |
|
cf0a8e173c39
Help GCC to do better code generation.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
38 static inline void *eemalloc (size_t n) __attribute__ ((__malloc__)); |
|
cf0a8e173c39
Help GCC to do better code generation.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
39 # endif |
| 4919 | 40 static inline void * |
| 41 eemalloc (size_t n) | |
| 42 { | |
| 43 /* If n is zero, allocate a 1-byte block. */ | |
| 44 if (n == 0) | |
| 45 n = 1; | |
| 46 return malloc (n); | |
| 47 } | |
| 48 #endif | |
| 49 | |
| 50 #if REALLOC_0_IS_NONNULL | |
| 51 # define eerealloc realloc | |
| 52 #else | |
| 53 static inline void * | |
| 54 eerealloc (void *p, size_t n) | |
| 55 { | |
| 56 /* If n is zero, allocate or keep a 1-byte block. */ | |
| 57 if (n == 0) | |
| 58 n = 1; | |
| 59 return realloc (p, n); | |
| 60 } | |
| 61 #endif | |
| 62 | |
| 63 /* Maybe we should also define variants | |
| 64 eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s) | |
| 65 eezalloc (size_t n) - like eemalloc followed by memset 0 | |
| 66 eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0 | |
| 67 eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s) | |
| 68 If this would be useful in your application. please speak up. */ | |
| 69 | |
| 70 #endif /* _EEALLOC_H */ |