274 lines
9.8 KiB
C
274 lines
9.8 KiB
C
/*
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* compat.h - Portability shim for building BSD userland on Linux.
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*
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* Must be included before any system headers (either directly or via
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* the compiler's -include flag).
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*/
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#ifndef VX_COMPAT_H
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#define VX_COMPAT_H
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/*
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* Feature-test macros -- unlock POSIX/GNU extensions in glibc headers.
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* This exposes: strdup, asprintf, mkstemp, reallocarray, madvise,
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* MADV_SEQUENTIAL, isascii, PATH_MAX, among others.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <sys/types.h>
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#include <stddef.h>
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#include <stdio.h>
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/* ------------------------------------------------------------------ */
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/* sys/cdefs.h compat -- BSD compiler attribute macros */
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/* ------------------------------------------------------------------ */
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#ifndef __dead2
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#define __dead2 __attribute__((noreturn))
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#endif
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#ifndef __unused
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#define __unused __attribute__((unused))
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#endif
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#ifndef __DECONST
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#define __DECONST(type, var) ((type)(unsigned long)(const void *)(var))
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#endif
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/* ------------------------------------------------------------------ */
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/* Capsicum / sandbox stubs -- Linux has no Capsicum */
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/* ------------------------------------------------------------------ */
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#ifndef __FreeBSD__
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typedef struct { int cr_rights; } cap_rights_t;
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#define cap_rights_init(r, ...) ((void)0)
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#define cap_rights_set(r, ...) ((void)0)
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#define caph_rights_limit(fd, r) (0)
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#define caph_limit_stream(fd, r) (0)
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#define caph_limit_stdio() (0)
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#define caph_limit_stdin() (0)
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#define caph_limit_stdout() (0)
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#define caph_limit_stderr() (0)
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#define caph_cache_catpages() (0)
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#define caph_cache_tzdata() (0)
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#define caph_enter() (0)
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#define CAP_READ 0
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#define CAP_WRITE 0
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#define CAP_FSTAT 0
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#define CAP_SEEK 0
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#define CAP_MMAP_R 0
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#define CAP_FCNTL 0
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#define CAP_EVENT 0
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#define CAPH_READ 0
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#define CAPH_WRITE 0
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#define CAPH_IGNORE_EBADF 0
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#endif
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/* ------------------------------------------------------------------ */
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/* SIGINFO -- BSD-only signal; not available on Linux */
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/* ------------------------------------------------------------------ */
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#ifndef SIGINFO
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#define SIGINFO SIGUSR1
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#endif
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/* ------------------------------------------------------------------ */
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/* sig_t -- BSD typedef for signal handler function pointer */
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/* ------------------------------------------------------------------ */
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#ifndef __OpenBSD__
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#include <signal.h>
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#ifndef __FreeBSD__
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typedef void (*sig_t)(int);
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#endif
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#endif
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/* ------------------------------------------------------------------ */
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/* d_namlen -- BSD struct dirent member; Linux lacks it */
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/* ------------------------------------------------------------------ */
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#include <string.h>
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#include <dirent.h>
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#ifndef _DIRENT_HAVE_D_NAMLEN
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#define DIRENT_NAMLEN(dp) strlen((dp)->d_name)
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#else
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#define DIRENT_NAMLEN(dp) ((dp)->d_namlen)
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#endif
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/*
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* d_fileno -- BSD name for inode number in struct dirent.
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* Linux uses d_ino.
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*/
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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#define d_fileno d_ino
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#endif
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/* ------------------------------------------------------------------ */
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/* fgetln -- BSD line-reading function; see fgetln.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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char *fgetln(FILE *fp, size_t *lenp);
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#endif
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/* ------------------------------------------------------------------ */
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/* strlcpy / strlcat -- bounded string ops from OpenBSD */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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#if !defined(__GLIBC__) || (__GLIBC__ < 2) || \
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(__GLIBC__ == 2 && __GLIBC_MINOR__ < 38)
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size_t strlcpy(char *dst, const char *src, size_t dsize);
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size_t strlcat(char *dst, const char *src, size_t dsize);
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#define VX_NEED_STRLCPY 1
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#endif
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#endif
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/* ------------------------------------------------------------------ */
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/* reallocf -- frees original on failure; see reallocf.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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void *reallocf(void *ptr, size_t size);
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#endif
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/* ------------------------------------------------------------------ */
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/* strtonum -- safe string-to-number; see strtonum.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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long long strtonum(const char *nptr, long long minval,
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long long maxval, const char **errstrp);
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#endif
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/* ------------------------------------------------------------------ */
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/* errc / warnc -- BSD err.h variants with explicit errno */
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/* ------------------------------------------------------------------ */
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#include <err.h>
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#include <errno.h>
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#if !defined(__FreeBSD__)
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#define errc(eval, code, ...) do { errno = (code); err((eval), __VA_ARGS__); } while (0)
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#define warnc(code, ...) do { errno = (code); warn(__VA_ARGS__); } while (0)
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#endif
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/* ------------------------------------------------------------------ */
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/* expand_number -- FreeBSD libutil; see expand_number.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__)
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#include <stdint.h>
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int expand_number(const char *buf, uint64_t *num);
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#endif
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/* ------------------------------------------------------------------ */
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/* stdckdint.h -- C23 checked integer arithmetic */
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/* Provide fallback using GCC/Clang builtins. */
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/* ------------------------------------------------------------------ */
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#if defined(__has_include)
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#if __has_include(<stdckdint.h>)
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#include <stdckdint.h>
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#define VX_HAVE_STDCKDINT 1
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#endif
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#endif
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#ifndef VX_HAVE_STDCKDINT
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#define ckd_add(result, a, b) __builtin_add_overflow((a), (b), (result))
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#define ckd_sub(result, a, b) __builtin_sub_overflow((a), (b), (result))
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#define ckd_mul(result, a, b) __builtin_mul_overflow((a), (b), (result))
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#endif
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/* ------------------------------------------------------------------ */
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/* roundup macro -- BSD sys/param.h; may be missing */
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/* ------------------------------------------------------------------ */
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#ifndef roundup
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#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
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#endif
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/* ------------------------------------------------------------------ */
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/* optreset -- BSD getopt extension */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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#include <getopt.h>
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static int vx_optreset_dummy_ __attribute__((unused));
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#define optreset vx_optreset_dummy_
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#endif
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/* ------------------------------------------------------------------ */
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/* strmode -- convert mode_t to ls-style string; see strmode.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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void strmode(mode_t mode, char *p);
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#endif
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/* ------------------------------------------------------------------ */
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/* user_from_uid / group_from_gid -- cached passwd/group lookups */
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/* see ugid.c */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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const char *user_from_uid(uid_t uid, int nouser);
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const char *group_from_gid(gid_t gid, int nogroup);
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#endif
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/* ------------------------------------------------------------------ */
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/* MAXLOGNAME -- BSD login name limit; Linux uses LOGIN_NAME_MAX */
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/* ------------------------------------------------------------------ */
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#ifndef MAXLOGNAME
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#include <limits.h>
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#ifdef LOGIN_NAME_MAX
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#define MAXLOGNAME LOGIN_NAME_MAX
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#else
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#define MAXLOGNAME 17
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#endif
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#endif
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/* ------------------------------------------------------------------ */
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/* D_MD_ORDER -- BSD langinfo constant for month/day ordering */
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/* Not available on Linux; define a harmless fallback. */
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/* ------------------------------------------------------------------ */
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#include <langinfo.h>
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#ifndef D_MD_ORDER
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#define D_MD_ORDER D_FMT
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#endif
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/* ------------------------------------------------------------------ */
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/* MAXPATHLEN -- BSD path limit constant; Linux uses PATH_MAX */
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/* ------------------------------------------------------------------ */
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#ifndef MAXPATHLEN
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#include <limits.h>
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#ifdef PATH_MAX
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#define MAXPATHLEN PATH_MAX
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#else
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#define MAXPATHLEN 4096
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#endif
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#endif
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/* ------------------------------------------------------------------ */
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/* REG_BASIC -- BSD regex constant; 0 on Linux (default) */
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/* ------------------------------------------------------------------ */
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#ifndef REG_BASIC
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#define REG_BASIC 0
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#endif
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/* ------------------------------------------------------------------ */
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/* S_ISTXT -- BSD sticky bit name; Linux uses S_ISVTX */
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/* ------------------------------------------------------------------ */
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#ifndef S_ISTXT
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#define S_ISTXT S_ISVTX
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#endif
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/* ------------------------------------------------------------------ */
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/* QUAD_MAX -- BSD quad_t limit; use LLONG_MAX */
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/* ------------------------------------------------------------------ */
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#ifndef QUAD_MAX
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#include <limits.h>
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#define QUAD_MAX LLONG_MAX
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#endif
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/* ------------------------------------------------------------------ */
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/* setmode / getmode -- BSD file mode parsing */
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/* ------------------------------------------------------------------ */
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#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
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void *setmode(const char *p);
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mode_t getmode(const void *set, mode_t omode);
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#endif
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/* ------------------------------------------------------------------ */
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/* makedev -- Linux needs sys/sysmacros.h */
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/* ------------------------------------------------------------------ */
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#ifdef __linux__
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#include <sys/sysmacros.h>
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#endif
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#endif /* VX_COMPAT_H */
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