mdw@git.distorted.org.uk Git - dpkg/blob - lib/compat/compat.h

   1 /*
   2  * libcompat - system compatibility library
   3  * compat.h - system compatibility declarations
   4  *
   5  * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  * Copyright © 2008, 2009 Guillem Jover <guillem@debian.org>
   7  *
   8  * This is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef COMPAT_H
  23 #define COMPAT_H
  24
  25 #ifndef TEST_LIBCOMPAT
  26 #define TEST_LIBCOMPAT 0
  27 #endif
  28
  29 #if TEST_LIBCOMPAT || !defined(HAVE_STRNLEN) || !defined(HAVE_STRNDUP) || \
  30     !defined(HAVE_C99_SNPRINTF)
  31 #include <stddef.h>
  32 #endif
  33
  34 #if TEST_LIBCOMPAT || !defined(HAVE_ASPRINTF) || !defined(HAVE_C99_SNPRINTF)
  35 #include <stdarg.h>
  36 #endif
  37
  38 #if  TEST_LIBCOMPAT || !defined(HAVE_VA_COPY)
  39 #include <string.h>
  40 #endif
  41
  42 /* Language definitions. */
  43
  44 #ifdef __GNUC__
  45 #define LIBCOMPAT_GCC_VERSION (__GNUC__ << 8 | __GNUC_MINOR__)
  46 #else
  47 #define LIBCOMPAT_GCC_VERSION 0
  48 #endif
  49
  50 #if LIBCOMPAT_GCC_VERSION >= 0x0300
  51 #define LIBCOMPAT_ATTR_PRINTF(n)        __attribute__((format(printf, n, n + 1)))
  52 #define LIBCOMPAT_ATTR_VPRINTF(n)       __attribute__((format(printf, n, 0)))
  53 #else
  54 #define LIBCOMPAT_ATTR_PRINTF(n)
  55 #define LIBCOMPAT_ATTR_VPRINTF(n)
  56 #endif
  57
  58 /* For C++, define a __func__ fallback in case it's not natively supported. */
  59 #if defined(__cplusplus) && __cplusplus < 201103L
  60 # if LIBCOMPAT_GCC_VERSION >= 0x0200
  61 #  define __func__ __PRETTY_FUNCTION__
  62 # else
  63 #  define __func__ __FUNCTION__
  64 # endif
  65 #endif
  66
  67 #if defined(__cplusplus) && __cplusplus < 201103L
  68 #define nullptr 0
  69 #endif
  70
  71 #ifdef __cplusplus
  72 extern "C" {
  73 #endif
  74
  75 #ifndef HAVE_OFFSETOF
  76 #define offsetof(st, m) ((size_t)&((st *)NULL)->m)
  77 #endif
  78
  79 #ifndef HAVE_MAKEDEV
  80 #define makedev(maj, min) ((((maj) & 0xff) << 8) | ((min) & 0xff))
  81 #endif
  82
  83 #ifndef HAVE_O_NOFOLLOW
  84 #define O_NOFOLLOW 0
  85 #endif
  86
  87 #ifndef HAVE_P_TMPDIR
  88 #define P_tmpdir "/tmp"
  89 #endif
  90
  91 /*
  92  * Define WCOREDUMP if we don't have it already, coredumps won't be
  93  * detected, though.
  94  */
  95 #ifndef HAVE_WCOREDUMP
  96 #define WCOREDUMP(x) 0
  97 #endif
  98
  99 #ifndef HAVE_VA_COPY
 100 #define va_copy(dest, src) memcpy(&(dest), &(src), sizeof(va_list))
 101 #endif
 102
 103 #if TEST_LIBCOMPAT
 104 #undef snprintf
 105 #define snprintf test_snprintf
 106 #undef vsnprintf
 107 #define vsnprintf test_vsnprintf
 108 #undef asprintf
 109 #define asprintf test_asprintf
 110 #undef vasprintf
 111 #define vasprintf test_vasprintf
 112 #undef strndup
 113 #define strndup test_strndup
 114 #undef strnlen
 115 #define strnlen test_strnlen
 116 #undef strerror
 117 #define strerror test_strerror
 118 #undef strsignal
 119 #define strsignal test_strsignal
 120 #undef scandir
 121 #define scandir test_scandir
 122 #undef alphasort
 123 #define alphasort test_alphasort
 124 #undef unsetenv
 125 #define unsetenv test_unsetenv
 126 #endif
 127
 128 #if TEST_LIBCOMPAT || !defined(HAVE_C99_SNPRINTF)
 129 int snprintf(char *str, size_t n, char const *fmt, ...)
 130         LIBCOMPAT_ATTR_PRINTF(3);
 131 int vsnprintf(char *buf, size_t maxsize, const char *fmt, va_list args)
 132         LIBCOMPAT_ATTR_VPRINTF(3);
 133 #endif
 134
 135 #if TEST_LIBCOMPAT || !defined(HAVE_ASPRINTF)
 136 int asprintf(char **str, char const *fmt, ...)
 137         LIBCOMPAT_ATTR_PRINTF(2);
 138 int vasprintf(char **str, const char *fmt, va_list args)
 139         LIBCOMPAT_ATTR_VPRINTF(2);
 140 #endif
 141
 142 #if TEST_LIBCOMPAT || !defined(HAVE_STRNLEN)
 143 size_t strnlen(const char *s, size_t n);
 144 #endif
 145
 146 #if TEST_LIBCOMPAT || !defined(HAVE_STRNDUP)
 147 char *strndup(const char *s, size_t n);
 148 #endif
 149
 150 #if TEST_LIBCOMPAT || !defined(HAVE_STRERROR)
 151 const char *strerror(int);
 152 #endif
 153
 154 #if TEST_LIBCOMPAT || !defined(HAVE_STRSIGNAL)
 155 const char *strsignal(int);
 156 #endif
 157
 158 #if TEST_LIBCOMPAT || !defined(HAVE_SCANDIR)
 159 struct dirent;
 160 int scandir(const char *dir, struct dirent ***namelist,
 161             int (*filter)(const struct dirent *),
 162             int (*cmp)(const void *, const void *));
 163 #endif
 164
 165 #if TEST_LIBCOMPAT || !defined(HAVE_ALPHASORT)
 166 int alphasort(const void *a, const void *b);
 167 #endif
 168
 169 #if TEST_LIBCOMPAT || !defined(HAVE_UNSETENV)
 170 int unsetenv(const char *x);
 171 #endif
 172
 173 #if TEST_LIBCOMPAT || !defined(HAVE_SETEXECFILECON)
 174 int setexecfilecon(const char *filename, const char *fallback_type);
 175 #endif
 176
 177 #ifdef __cplusplus
 178 }
 179 #endif
 180
 181 #endif /* COMPAT_H */