Line data Source code
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 <stddef.h>
34 : #include <stdint.h>
35 : #include <sys/param.h>
36 : #include <endian.h>
37 : #include <byteswap.h>
38 : #include <unistd.h>
39 :
40 : #if __BYTE_ORDER == __LITTLE_ENDIAN
41 : # define LE32(n) (n)
42 : # define LE64(n) (n)
43 : # define BE32(n) bswap_32 (n)
44 : # define BE64(n) bswap_64 (n)
45 : #elif __BYTE_ORDER == __BIG_ENDIAN
46 : # define BE32(n) (n)
47 : # define BE64(n) (n)
48 : # define LE32(n) bswap_32 (n)
49 : # define LE64(n) bswap_64 (n)
50 : #else
51 : # error "Unknown byte order"
52 : #endif
53 :
54 : #ifndef MAX
55 : #define MAX(m, n) ((m) < (n) ? (n) : (m))
56 : #endif
57 :
58 : #ifndef MIN
59 : #define MIN(m, n) ((m) < (n) ? (m) : (n))
60 : #endif
61 :
62 : #if !HAVE_DECL_POWEROF2
63 : #define powerof2(x) (((x) & ((x) - 1)) == 0)
64 : #endif
65 :
66 : #if !HAVE_DECL_MEMPCPY
67 : #define mempcpy(dest, src, n) \
68 : ((void *) ((char *) memcpy (dest, src, n) + (size_t) n))
69 : #endif
70 :
71 : /* A special gettext function we use if the strings are too short. */
72 : #define sgettext(Str) \
73 : ({ const char *__res = strrchr (gettext (Str), '|'); \
74 : __res ? __res + 1 : Str; })
75 :
76 : #define gettext_noop(Str) Str
77 :
78 : #ifndef TEMP_FAILURE_RETRY
79 : #define TEMP_FAILURE_RETRY(expression) \
80 : ({ ssize_t __res; \
81 : do \
82 : __res = expression; \
83 : while (__res == -1 && errno == EINTR); \
84 : __res; })
85 : #endif
86 :
87 : static inline ssize_t __attribute__ ((unused))
88 6196 : pwrite_retry (int fd, const void *buf, size_t len, off_t off)
89 : {
90 6196 : ssize_t recvd = 0;
91 :
92 : do
93 : {
94 6196 : ssize_t ret = TEMP_FAILURE_RETRY (pwrite (fd, buf + recvd, len - recvd,
95 : off + recvd));
96 6196 : if (ret <= 0)
97 75 : return ret < 0 ? ret : recvd;
98 :
99 6121 : recvd += ret;
100 : }
101 6121 : while ((size_t) recvd < len);
102 :
103 : return recvd;
104 : }
105 :
106 : static inline ssize_t __attribute__ ((unused))
107 14 : write_retry (int fd, const void *buf, size_t len)
108 : {
109 14 : ssize_t recvd = 0;
110 :
111 : do
112 : {
113 14 : ssize_t ret = TEMP_FAILURE_RETRY (write (fd, buf + recvd, len - recvd));
114 14 : if (ret <= 0)
115 0 : return ret < 0 ? ret : recvd;
116 :
117 14 : recvd += ret;
118 : }
119 14 : while ((size_t) recvd < len);
120 :
121 : return recvd;
122 : }
123 :
124 : static inline ssize_t __attribute__ ((unused))
125 26831 : pread_retry (int fd, void *buf, size_t len, off_t off)
126 : {
127 26831 : ssize_t recvd = 0;
128 :
129 : do
130 : {
131 63684 : ssize_t ret = TEMP_FAILURE_RETRY (pread (fd, buf + recvd, len - recvd,
132 : off + recvd));
133 31842 : if (ret <= 0)
134 5011 : return ret < 0 ? ret : recvd;
135 :
136 26831 : recvd += ret;
137 : }
138 26831 : while ((size_t) recvd < len);
139 :
140 : return recvd;
141 : }
142 :
143 : /* The demangler from libstdc++. */
144 : extern char *__cxa_demangle (const char *mangled_name, char *output_buffer,
145 : size_t *length, int *status);
146 :
147 : /* A static assertion. This will cause a compile-time error if EXPR,
148 : which must be a compile-time constant, is false. */
149 :
150 : #define eu_static_assert(expr) \
151 : extern int never_defined_just_used_for_checking[(expr) ? 1 : -1] \
152 : __attribute__ ((unused))
153 :
154 : #endif /* system.h */
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