1 /* Declarations for common convenience functions.
2 Copyright (C) 2006-2011 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29 #ifndef LIB_SYSTEM_H
30 #define LIB_SYSTEM_H 1
31
32 #include <errno.h>
33 #include <error.h>
34 #include <stddef.h>
35 #include <stdint.h>
36 #include <sys/param.h>
37 #include <endian.h>
38 #include <byteswap.h>
39 #include <unistd.h>
40
41 #if __BYTE_ORDER == __LITTLE_ENDIAN
42 # define LE32(n) (n)
43 # define LE64(n) (n)
44 # define BE32(n) bswap_32 (n)
45 # define BE64(n) bswap_64 (n)
46 #elif __BYTE_ORDER == __BIG_ENDIAN
47 # define BE32(n) (n)
48 # define BE64(n) (n)
49 # define LE32(n) bswap_32 (n)
50 # define LE64(n) bswap_64 (n)
51 #else
52 # error "Unknown byte order"
53 #endif
54
55 #ifndef MAX
56 #define MAX(m, n) ((m) < (n) ? (n) : (m))
57 #endif
58
59 #ifndef MIN
60 #define MIN(m, n) ((m) < (n) ? (m) : (n))
61 #endif
62
63 #if !HAVE_DECL_POWEROF2
64 #define powerof2(x) (((x) & ((x) - 1)) == 0)
65 #endif
66
67 #if !HAVE_DECL_MEMPCPY
68 #define mempcpy(dest, src, n) \
69 ((void *) ((char *) memcpy (dest, src, n) + (size_t) n))
70 #endif
71
72 /* A special gettext function we use if the strings are too short. */
73 #define sgettext(Str) \
74 ({ const char *__res = strrchr (gettext (Str), '|'); \
75 __res ? __res + 1 : Str; })
76
77 #define gettext_noop(Str) Str
78
79 #ifndef TEMP_FAILURE_RETRY
80 #define TEMP_FAILURE_RETRY(expression) \
81 ({ ssize_t __res; \
82 do \
83 __res = expression; \
84 while (__res == -1 && errno == EINTR); \
85 __res; })
86 #endif
87
88 static inline ssize_t __attribute__ ((unused))
pwrite_retry(int fd,const void * buf,size_t len,off_t off)89 pwrite_retry (int fd, const void *buf, size_t len, off_t off)
90 {
91 ssize_t recvd = 0;
92
93 do
94 {
95 ssize_t ret = TEMP_FAILURE_RETRY (pwrite (fd, buf + recvd, len - recvd,
96 off + recvd));
97 if (ret <= 0)
98 return ret < 0 ? ret : recvd;
99
100 recvd += ret;
101 }
102 while ((size_t) recvd < len);
103
104 return recvd;
105 }
106
107 static inline ssize_t __attribute__ ((unused))
write_retry(int fd,const void * buf,size_t len)108 write_retry (int fd, const void *buf, size_t len)
109 {
110 ssize_t recvd = 0;
111
112 do
113 {
114 ssize_t ret = TEMP_FAILURE_RETRY (write (fd, buf + recvd, len - recvd));
115 if (ret <= 0)
116 return ret < 0 ? ret : recvd;
117
118 recvd += ret;
119 }
120 while ((size_t) recvd < len);
121
122 return recvd;
123 }
124
125 static inline ssize_t __attribute__ ((unused))
pread_retry(int fd,void * buf,size_t len,off_t off)126 pread_retry (int fd, void *buf, size_t len, off_t off)
127 {
128 ssize_t recvd = 0;
129
130 do
131 {
132 ssize_t ret = TEMP_FAILURE_RETRY (pread (fd, buf + recvd, len - recvd,
133 off + recvd));
134 if (ret <= 0)
135 return ret < 0 ? ret : recvd;
136
137 recvd += ret;
138 }
139 while ((size_t) recvd < len);
140
141 return recvd;
142 }
143
144 /* The demangler from libstdc++. */
145 extern char *__cxa_demangle (const char *mangled_name, char *output_buffer,
146 size_t *length, int *status);
147
148 /* A static assertion. This will cause a compile-time error if EXPR,
149 which must be a compile-time constant, is false. */
150
151 #define eu_static_assert(expr) \
152 extern int never_defined_just_used_for_checking[(expr) ? 1 : -1] \
153 __attribute__ ((unused))
154
155 #endif /* system.h */
156