374 lines
9.9 KiB
C
374 lines
9.9 KiB
C
// Workarounds for horrible build environment idiosyncrasies.
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// Instead of polluting the code with strange #ifdefs to work around bugs
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// in specific compiler, library, or OS versions, localize all that here
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// and in portability.c
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// Always use long file support.
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// This must come before we #include any system header file to take effect!
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#define _FILE_OFFSET_BITS 64
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// For musl
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#define _ALL_SOURCE
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#include <regex.h>
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#ifndef REG_STARTEND
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#define REG_STARTEND 0
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#endif
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#ifdef __APPLE__
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// macOS 10.13 doesn't have the POSIX 2008 direct access to timespec in
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// struct stat, but we can ask it to give us something equivalent...
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// (This must come before any #include!)
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#define _DARWIN_C_SOURCE
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// ...and then use macros to paper over the difference.
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#define st_atim st_atimespec
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#define st_ctim st_ctimespec
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#define st_mtim st_mtimespec
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#endif
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// Test for gcc (using compiler builtin #define)
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#ifdef __GNUC__
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#define printf_format __attribute__((format(printf, 1, 2)))
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#else
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#define printf_format
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#endif
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// This isn't in the spec, but it's how we determine what libc we're using.
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// Types various replacement prototypes need.
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// This also lets us determine what libc we're using. Systems that
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// have <features.h> will transitively include it, and ones that don't --
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// macOS -- won't break.
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#include <sys/types.h>
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// Various constants old build environments might not have even if kernel does
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#ifndef AT_FDCWD
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#define AT_FDCWD -100
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#endif
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#ifndef AT_SYMLINK_NOFOLLOW
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#define AT_SYMLINK_NOFOLLOW 0x100
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#endif
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#ifndef AT_REMOVEDIR
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#define AT_REMOVEDIR 0x200
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#endif
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#ifndef RLIMIT_RTTIME
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#define RLIMIT_RTTIME 15
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#endif
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// Introduced in Linux 3.1
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#ifndef SEEK_DATA
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#define SEEK_DATA 3
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#endif
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#ifndef SEEK_HOLE
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#define SEEK_HOLE 4
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#endif
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// We don't define GNU_dammit because we're not part of the gnu project, and
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// don't want to get any FSF on us. Unfortunately glibc (gnu libc)
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// won't give us Linux syscall wrappers without claiming to be part of the
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// gnu project (because Stallman's "GNU owns Linux" revisionist history
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// crusade includes the kernel, even though Linux was inspired by Minix).
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// We use most non-posix Linux syscalls directly through the syscall() wrapper,
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// but even many posix-2008 functions aren't provided by glibc unless you
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// claim it's in the name of Gnu.
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#if defined(__GLIBC__)
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// "Function prototypes shall be provided." but aren't.
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// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
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char *crypt(const char *key, const char *salt);
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// According to posix, #include header, get a function definition. But glibc...
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// http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
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#include <wchar.h>
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int wcwidth(wchar_t wc);
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// see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
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#include <time.h>
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char *strptime(const char *buf, const char *format, struct tm *tm);
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// They didn't like posix basename so they defined another function with the
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// same name and if you include libgen.h it #defines basename to something
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// else (where they implemented the real basename), and that define breaks
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// the table entry for the basename command. They didn't make a new function
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// with a different name for their new behavior because gnu.
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//
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// Solution: don't use their broken header, provide an inline to redirect the
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// correct name to the broken name.
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char *dirname(char *path);
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char *__xpg_basename(char *path);
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static inline char *basename(char *path) { return __xpg_basename(path); }
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char *strcasestr(const char *haystack, const char *needle);
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void *memmem(const void *haystack, size_t haystack_length,
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const void *needle, size_t needle_length);
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#endif // defined(glibc)
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// getopt_long(), getopt_long_only(), and struct option.
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#include <getopt.h>
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#if !defined(__GLIBC__)
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// POSIX basename.
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#include <libgen.h>
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#endif
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// Work out how to do endianness
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#ifdef __APPLE__
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#include <libkern/OSByteOrder.h>
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#ifdef __BIG_ENDIAN__
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#define IS_BIG_ENDIAN 1
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#else
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#define IS_BIG_ENDIAN 0
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#endif
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#define bswap_16(x) OSSwapInt16(x)
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#define bswap_32(x) OSSwapInt32(x)
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#define bswap_64(x) OSSwapInt64(x)
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#elif defined(__FreeBSD__) || defined(__OpenBSD__)
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#include <sys/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define IS_BIG_ENDIAN 1
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#else
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#define IS_BIG_ENDIAN 0
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#endif
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#else
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#include <byteswap.h>
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#include <endian.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define IS_BIG_ENDIAN 1
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#else
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#define IS_BIG_ENDIAN 0
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#endif
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#endif
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#if IS_BIG_ENDIAN
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#define IS_LITTLE_ENDIAN 0
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#define SWAP_BE16(x) (x)
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#define SWAP_BE32(x) (x)
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#define SWAP_BE64(x) (x)
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#define SWAP_LE16(x) bswap_16(x)
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#define SWAP_LE32(x) bswap_32(x)
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#define SWAP_LE64(x) bswap_64(x)
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#else
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#define IS_LITTLE_ENDIAN 1
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#define SWAP_BE16(x) bswap_16(x)
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#define SWAP_BE32(x) bswap_32(x)
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#define SWAP_BE64(x) bswap_64(x)
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#define SWAP_LE16(x) (x)
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#define SWAP_LE32(x) (x)
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#define SWAP_LE64(x) (x)
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#endif
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// Linux headers not listed by POSIX or LSB
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#include <sys/mount.h>
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#ifdef __linux__
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#include <sys/statfs.h>
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#include <sys/swap.h>
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#include <sys/sysinfo.h>
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#endif
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#ifdef __APPLE__
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#include <util.h>
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#elif !defined(__FreeBSD__) && !defined(__OpenBSD__)
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#include <pty.h>
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#else
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#include <termios.h>
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#ifndef IUTF8
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#define IUTF8 0
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#endif
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#endif
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#if defined(__APPLE__) || defined(__linux__)
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// Linux and macOS has both have getxattr and friends in <sys/xattr.h>, but
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// they aren't compatible.
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#include <sys/xattr.h>
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ssize_t xattr_get(const char *, const char *, void *, size_t);
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ssize_t xattr_lget(const char *, const char *, void *, size_t);
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ssize_t xattr_fget(int fd, const char *, void *, size_t);
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ssize_t xattr_list(const char *, char *, size_t);
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ssize_t xattr_llist(const char *, char *, size_t);
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ssize_t xattr_flist(int, char *, size_t);
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ssize_t xattr_set(const char*, const char*, const void*, size_t, int);
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ssize_t xattr_lset(const char*, const char*, const void*, size_t, int);
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ssize_t xattr_fset(int, const char*, const void*, size_t, int);
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#endif
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#if defined(__APPLE__)
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// macOS doesn't have these functions, but we can fake them.
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int mknodat(int, const char*, mode_t, dev_t);
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int posix_fallocate(int, off_t, off_t);
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// macOS keeps newlocale(3) in the non-POSIX <xlocale.h> rather than <locale.h>.
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#include <xlocale.h>
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#endif
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#if defined(__APPLE__) || defined(__OpenBSD__)
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static inline long statfs_bsize(struct statfs *sf) { return sf->f_iosize; }
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static inline long statfs_frsize(struct statfs *sf) { return sf->f_bsize; }
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#else
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static inline long statfs_bsize(struct statfs *sf) { return sf->f_bsize; }
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static inline long statfs_frsize(struct statfs *sf) { return sf->f_frsize; }
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#endif
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// Android is missing some headers and functions
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// "generated/config.h" is included first
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#if CFG_TOYBOX_SHADOW
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#include <shadow.h>
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#endif
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#if CFG_TOYBOX_UTMPX
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#include <utmpx.h>
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#else
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struct utmpx {int ut_type;};
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#define USER_PROCESS 0
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static inline struct utmpx *getutxent(void) {return 0;}
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static inline void setutxent(void) {;}
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static inline void endutxent(void) {;}
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#endif
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// Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
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#include <fcntl.h>
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#ifndef O_NOFOLLOW
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#define O_NOFOLLOW 0
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#endif
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#ifndef O_NOATIME
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#define O_NOATIME 01000000
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#endif
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 02000000
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#endif
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#ifndef O_PATH
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#define O_PATH 010000000
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#endif
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#ifndef SCHED_RESET_ON_FORK
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#define SCHED_RESET_ON_FORK (1<<30)
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#endif
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// Glibc won't give you linux-kernel constants unless you say "no, a BUD lite"
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// even though linux has nothing to do with the FSF and never has.
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#ifndef F_SETPIPE_SZ
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#define F_SETPIPE_SZ 1031
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#endif
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#ifndef F_GETPIPE_SZ
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#define F_GETPIPE_SZ 1032
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#endif
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#if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \
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&& __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__
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typedef double FLOAT;
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#else
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typedef float FLOAT;
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#endif
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#ifndef __uClinux__
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pid_t xfork(void);
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#endif
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//#define strncpy(...) @@strncpyisbadmmkay@@
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//#define strncat(...) @@strncatisbadmmkay@@
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// Support building the Android tools on glibc, so hermetic AOSP builds can
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// use toybox before they're ready to switch to host bionic.
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#ifdef __BIONIC__
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#include <android/log.h>
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#else
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typedef enum android_LogPriority {
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ANDROID_LOG_UNKNOWN = 0,
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ANDROID_LOG_DEFAULT,
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ANDROID_LOG_VERBOSE,
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ANDROID_LOG_DEBUG,
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ANDROID_LOG_INFO,
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ANDROID_LOG_WARN,
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ANDROID_LOG_ERROR,
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ANDROID_LOG_FATAL,
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ANDROID_LOG_SILENT,
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} android_LogPriority;
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static inline int __android_log_write(int pri, const char *tag, const char *msg)
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{
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return -1;
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}
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#endif
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// libprocessgroup is an Android platform library not included in the NDK.
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#if defined(__BIONIC__)
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#if __has_include(<processgroup/sched_policy.h>)
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#include <processgroup/sched_policy.h>
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#define GOT_IT
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#endif
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#endif
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#ifdef GOT_IT
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#undef GOT_IT
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#else
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static inline int get_sched_policy(int tid, void *policy) {return 0;}
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static inline char *get_sched_policy_name(int policy) {return "unknown";}
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#endif
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// Android NDKv18 has liblog.so but not liblog.c for static builds,
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// stub it out for now.
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#ifdef __ANDROID_NDK__
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#define __android_log_write(a, b, c) (0)
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#endif
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#ifndef SYSLOG_NAMES
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typedef struct {char *c_name; int c_val;} CODE;
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extern CODE prioritynames[], facilitynames[];
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#endif
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#if CFG_TOYBOX_GETRANDOM
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#include <sys/random.h>
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#endif
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int xgetrandom(void *buf, unsigned len, unsigned flags);
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// Android's bionic libc doesn't have confstr.
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#ifdef __BIONIC__
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#define _CS_PATH 0
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#define _CS_V7_ENV 1
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#include <string.h>
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static inline void confstr(int a, char *b, int c) {strcpy(b, a ? "POSIXLY_CORRECT=1" : "/bin:/usr/bin");}
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#endif
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// Paper over the differences between BSD kqueue and Linux inotify for tail.
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struct xnotify {
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char **paths;
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int max, *fds, count, kq;
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};
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struct xnotify *xnotify_init(int max);
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int xnotify_add(struct xnotify *not, int fd, char *path);
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int xnotify_wait(struct xnotify *not, char **path);
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int sig_to_num(char *s);
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char *num_to_sig(int sig);
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struct signame {
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int num;
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char *name;
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};
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void xsignal_all_killers(void *handler);
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// Different OSes encode major/minor device numbers differently.
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int dev_minor(int dev);
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int dev_major(int dev);
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int dev_makedev(int major, int minor);
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char *fs_type_name(struct statfs *statfs);
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int get_block_device_size(int fd, unsigned long long *size);
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