dhcpd-pools  3.0
ISC dhcpd lease usage analyser
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alloca.in.h
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1 /* Memory allocation on the stack.
2 
3  Copyright (C) 1995, 1999, 2001-2004, 2006-2017 Free Software Foundation,
4  Inc.
5 
6  This program is free software; you can redistribute it and/or modify it
7  under the terms of the GNU General Public License as published
8  by the Free Software Foundation; either version 3, or (at your option)
9  any later version.
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 GNU
14  General Public License for more details.
15 
16  You should have received a copy of the GNU General Public
17  License along with this program; if not, see
18  <https://www.gnu.org/licenses/>.
19  */
20 
21 /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
22  means there is a real alloca function. */
23 #ifndef _GL_ALLOCA_H
24 #define _GL_ALLOCA_H
25 
26 /* alloca (N) returns a pointer to N bytes of memory
27  allocated on the stack, which will last until the function returns.
28  Use of alloca should be avoided:
29  - inside arguments of function calls - undefined behaviour,
30  - in inline functions - the allocation may actually last until the
31  calling function returns,
32  - for huge N (say, N >= 65536) - you never know how large (or small)
33  the stack is, and when the stack cannot fulfill the memory allocation
34  request, the program just crashes.
35  */
36 
37 #ifndef alloca
38 # ifdef __GNUC__
39 # define alloca __builtin_alloca
40 # elif defined _AIX
41 # define alloca __alloca
42 # elif defined _MSC_VER
43 # include <malloc.h>
44 # define alloca _alloca
45 # elif defined __DECC && defined __VMS
46 # define alloca __ALLOCA
47 # elif defined __TANDEM && defined _TNS_E_TARGET
48 # ifdef __cplusplus
49 extern "C"
50 # endif
51 void *_alloca (unsigned short);
52 # pragma intrinsic (_alloca)
53 # define alloca _alloca
54 # elif defined __MVS__
55 # include <stdlib.h>
56 # else
57 # include <stddef.h>
58 # ifdef __cplusplus
59 extern "C"
60 # endif
61 void *alloca (size_t);
62 # endif
63 #endif
64 
65 #endif /* _GL_ALLOCA_H */
alloca
void * alloca(size_t)
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