229 lines
5.6 KiB
C
229 lines
5.6 KiB
C
/*
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* libcompat - system compatibility library
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* compat.h - system compatibility declarations
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*
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* Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
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* Copyright © 2008, 2009 Guillem Jover <guillem@debian.org>
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef COMPAT_H
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#define COMPAT_H
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#ifndef TEST_LIBCOMPAT
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#define TEST_LIBCOMPAT 0
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRNLEN) || !defined(HAVE_STRNDUP) || \
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!defined(HAVE_C99_SNPRINTF)
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#include <stddef.h>
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_ASPRINTF) || !defined(HAVE_C99_SNPRINTF)
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#include <stdarg.h>
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_VA_COPY)
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#include <string.h>
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_FGETPWENT) || !defined(HAVE_FGETGRENT)
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#include <stdio.h>
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_FGETPWENT)
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#include <pwd.h>
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_FGETGRENT)
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#include <grp.h>
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#endif
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/* Language definitions. */
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/* Supported since gcc 5.1.0 and clang 2.9.0. For attributes that appeared
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* before these versions, in addition we need to do version checks. */
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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#ifndef __has_include
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#define __has_include(x) 0
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#endif
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#ifdef __GNUC__
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#define LIBCOMPAT_GCC_VERSION (__GNUC__ << 8 | __GNUC_MINOR__)
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#else
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#define LIBCOMPAT_GCC_VERSION 0
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#endif
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#if LIBCOMPAT_GCC_VERSION >= 0x0300 || __has_attribute(__format__)
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#define LIBCOMPAT_ATTR_FMT(t, f, a) __attribute__((__format__(t, f, a)))
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#define LIBCOMPAT_ATTR_PRINTF(n) LIBCOMPAT_ATTR_FMT(__printf__, n, n + 1)
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#define LIBCOMPAT_ATTR_VPRINTF(n) LIBCOMPAT_ATTR_FMT(__printf__, n, 0)
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#else
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#define LIBCOMPAT_ATTR_FMT(t, f, a)
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#define LIBCOMPAT_ATTR_PRINTF(n)
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#define LIBCOMPAT_ATTR_VPRINTF(n)
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#endif
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#if LIBCOMPAT_GCC_VERSION >= 0x0300 || __has_attribute(__noreturn__)
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#define LIBCOMPAT_ATTR_NORET __attribute__((__noreturn__))
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#else
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#define LIBCOMPAT_ATTR_NORET
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#endif
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#if LIBCOMPAT_GCC_VERSION >= 0x0400 || __has_attribute(__sentinel__)
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#define LIBCOMPAT_ATTR_SENTINEL __attribute__((__sentinel__))
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#else
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#define LIBCOMPAT_ATTR_SENTINEL
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#endif
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#if __has_attribute(__enum_extensibility__)
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#define LIBCOMPAT_ATTR_ENUM_FLAGS \
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__attribute__((__enum_extensibility__(closed),__flag_enum__))
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#else
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#define LIBCOMPAT_ATTR_ENUM_FLAGS
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef HAVE_OFFSETOF
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#define offsetof(st, m) ((size_t)&((st *)NULL)->m)
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#endif
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#ifndef HAVE_MAKEDEV
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#define makedev(maj, min) ((((maj) & 0xff) << 8) | ((min) & 0xff))
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#endif
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#ifndef HAVE_O_NOFOLLOW
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#define O_NOFOLLOW 0
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#endif
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#ifndef HAVE_P_TMPDIR
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#define P_tmpdir "/tmp"
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#endif
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/*
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* Define WCOREDUMP if we don't have it already, coredumps won't be
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* detected, though.
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*/
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#ifndef HAVE_WCOREDUMP
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#define WCOREDUMP(x) 0
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#endif
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#ifndef HAVE_VA_COPY
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#define va_copy(dest, src) memcpy(&(dest), &(src), sizeof(va_list))
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#endif
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#if TEST_LIBCOMPAT
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#undef snprintf
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#define snprintf test_snprintf
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#undef vsnprintf
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#define vsnprintf test_vsnprintf
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#undef asprintf
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#define asprintf test_asprintf
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#undef vasprintf
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#define vasprintf test_vasprintf
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#undef strchrnul
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#define strchrnul test_strchrnul
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#undef strndup
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#define strndup test_strndup
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#undef strnlen
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#define strnlen test_strnlen
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#undef strerror
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#define strerror test_strerror
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#undef strsignal
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#define strsignal test_strsignal
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#undef fgetpwent
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#define fgetpwent test_fgetpwent
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#undef fgetgrent
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#define fgetgrent test_fgetgrent
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#undef scandir
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#define scandir test_scandir
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#undef alphasort
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#define alphasort test_alphasort
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#undef unsetenv
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#define unsetenv test_unsetenv
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#endif
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#if !HAVE_DECL_SYS_SIGLIST
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extern const char *const sys_siglist[];
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_C99_SNPRINTF)
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int snprintf(char *str, size_t n, char const *fmt, ...)
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LIBCOMPAT_ATTR_PRINTF(3);
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int vsnprintf(char *buf, size_t maxsize, const char *fmt, va_list args)
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LIBCOMPAT_ATTR_VPRINTF(3);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_ASPRINTF)
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int asprintf(char **str, char const *fmt, ...)
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LIBCOMPAT_ATTR_PRINTF(2);
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int vasprintf(char **str, const char *fmt, va_list args)
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LIBCOMPAT_ATTR_VPRINTF(2);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRCHRNUL)
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char *strchrnul(const char *s, int c);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRNLEN)
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size_t strnlen(const char *s, size_t n);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRNDUP)
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char *strndup(const char *s, size_t n);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRERROR)
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const char *strerror(int);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_STRSIGNAL)
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const char *strsignal(int);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_FGETPWENT)
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struct passwd *fgetpwent(FILE *fp);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_FGETGRENT)
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struct group *fgetgrent(FILE *fp);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_SCANDIR)
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struct dirent;
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int scandir(const char *dir, struct dirent ***namelist,
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int (*filter)(const struct dirent *),
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int (*cmp)(const void *, const void *));
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_ALPHASORT)
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int alphasort(const void *a, const void *b);
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#endif
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#if TEST_LIBCOMPAT || !defined(HAVE_UNSETENV)
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int unsetenv(const char *x);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* COMPAT_H */
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