Mercurial > gnulib
annotate lib/eealloc.h @ 40057:b06060465f09
maint: Run 'make update-copyright'
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 01 Jan 2019 00:25:11 +0100 |
| parents | 0b05f2be9830 |
| children |
| rev | line source |
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| 4919 | 1 /* Memory allocation with expensive empty allocations. |
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2 Copyright (C) 2003, 2008, 2010-2019 Free Software Foundation, Inc. |
| 4919 | 3 Written by Bruno Haible <bruno@clisp.org>, 2003, |
| 4 based on prior work by Jim Meyering. | |
| 5 | |
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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 |
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8 the Free Software Foundation; either version 3 of the License, or |
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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 | |
| 19190 | 17 along with this program. If not, see <https://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 | |
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34 #ifndef _GL_INLINE_HEADER_BEGIN |
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35 #error "Please include config.h first." |
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36 #endif |
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37 _GL_INLINE_HEADER_BEGIN |
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38 #ifndef EEALLOC_INLINE |
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39 # define EEALLOC_INLINE _GL_INLINE |
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40 #endif |
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41 |
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42 #if ! defined __clang__ && \ |
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43 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) |
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44 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args)) |
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45 #else |
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46 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) |
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47 #endif |
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48 |
| 4919 | 49 #if MALLOC_0_IS_NONNULL |
| 50 # define eemalloc malloc | |
| 51 #else | |
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52 EEALLOC_INLINE void *eemalloc (size_t n) |
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53 _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1)); |
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54 EEALLOC_INLINE void * |
| 4919 | 55 eemalloc (size_t n) |
| 56 { | |
| 57 /* If n is zero, allocate a 1-byte block. */ | |
| 58 if (n == 0) | |
| 59 n = 1; | |
| 60 return malloc (n); | |
| 61 } | |
| 62 #endif | |
| 63 | |
| 64 #if REALLOC_0_IS_NONNULL | |
| 65 # define eerealloc realloc | |
| 66 #else | |
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67 EEALLOC_INLINE void *eerealloc (void *p, size_t n) |
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68 _GL_ATTRIBUTE_ALLOC_SIZE ((2)); |
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69 EEALLOC_INLINE void * |
| 4919 | 70 eerealloc (void *p, size_t n) |
| 71 { | |
| 72 /* If n is zero, allocate or keep a 1-byte block. */ | |
| 73 if (n == 0) | |
| 74 n = 1; | |
| 75 return realloc (p, n); | |
| 76 } | |
| 77 #endif | |
| 78 | |
| 79 /* Maybe we should also define variants | |
| 80 eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s) | |
| 81 eezalloc (size_t n) - like eemalloc followed by memset 0 | |
| 82 eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0 | |
| 83 eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s) | |
| 84 If this would be useful in your application. please speak up. */ | |
| 85 | |
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86 _GL_INLINE_HEADER_END |
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87 |
| 4919 | 88 #endif /* _EEALLOC_H */ |