-// Humor glibc to get dprintf, then #define it to something more portable.
-#define _GNU_SOURCE
-#include <stdio.h>
-#define fdprintf(...) dprintf(__VA_ARGS__)
+// Workarounds for horrible build environment idiosyncrasies.
+
+// Instead of polluting the code with strange #ifdefs to work around bugs
+// in specific compiler, library, or OS versions, localize all that here
+// and in portability.c
+
+// For musl
+#define _ALL_SOURCE
+
+// Test for gcc (using compiler builtin #define)
#ifdef __GNUC__
#define noreturn __attribute__((noreturn))
+#if CFG_TOYBOX_DEBUG
+#define printf_format __attribute__((format(printf, 1, 2)))
+#else
+#define printf_format
+#endif
#else
#define noreturn
+#define printf_format
+#endif
+
+// Always use long file support.
+#define _FILE_OFFSET_BITS 64
+
+// This isn't in the spec, but it's how we determine what libc we're using.
+
+#include <features.h>
+
+// Types various replacement prototypes need
+#include <sys/types.h>
+
+// Various constants old build environments might not have even if kernel does
+
+#ifndef AT_FDCWD
+#define AT_FDCWD -100
+#endif
+
+#ifndef AT_SYMLINK_NOFOLLOW
+#define AT_SYMLINK_NOFOLLOW 0x100
+#endif
+
+#ifndef AT_REMOVEDIR
+#define AT_REMOVEDIR 0x200
+#endif
+
+// We don't define GNU_dammit because we're not part of the gnu project, and
+// don't want to get any FSF on us. Unfortunately glibc (gnu libc)
+// won't give us Linux syscall wrappers without claiming to be part of the
+// gnu project (because Stallman's "GNU owns Linux" revisionist history
+// crusade includes the kernel, even though Linux was inspired by Minix).
+
+// We use most non-posix Linux syscalls directly through the syscall() wrapper,
+// but even many posix-2008 functions aren't provided by glibc unless you
+// claim it's in the name of Gnu.
+
+#if defined(__GLIBC__)
+// "Function prototypes shall be provided." but aren't.
+// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
+char *crypt(const char *key, const char *salt);
+
+// According to posix, #include header, get a function definition. But glibc...
+// http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
+#include <wchar.h>
+int wcwidth(wchar_t wc);
+
+// see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
+#include <time.h>
+char *strptime(const char *buf, const char *format, struct tm *tm);
+
+// They didn't like posix basename so they defined another function with the
+// same name and if you include libgen.h it #defines basename to something
+// else (where they implemented the real basename), and that define breaks
+// the table entry for the basename command. They didn't make a new function
+// with a different name for their new behavior because gnu.
+//
+// Solution: don't use their broken header, provide an inline to redirect the
+// correct name to the broken name.
+
+char *dirname(char *path);
+char *__xpg_basename(char *path);
+static inline char *basename(char *path) { return __xpg_basename(path); }
+
+// uClibc pretends to be glibc and copied a lot of its bugs, but has a few more
+#if defined(__UCLIBC__)
+#include <unistd.h>
+#include <stdio.h>
+ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
+char *stpcpy(char *dest, const char *src);
+pid_t getsid(pid_t pid);
+
+// uClibc's last-ever release was in 2012, so of course it doesn't define
+// any flag newer than MS_MOVE, which was added in 2001 (linux 2.5.0.5),
+// eleven years earlier.
+
+#include <sys/mount.h>
+#ifndef MS_MOVE
+#define MS_MOVE (1<<13)
+#endif
+#ifndef MS_REC
+#define MS_REC (1<<14)
+#endif
+#ifndef MS_SILENT
+#define MS_SILENT (1<<15)
+#endif
+#ifndef MS_UNBINDABLE
+#define MS_UNBINDABLE (1<<17)
#endif
+#ifndef MS_PRIVATE
+#define MS_PRIVATE (1<<18)
+#endif
+#ifndef MS_SLAVE
+#define MS_SLAVE (1<<19)
+#endif
+#ifndef MS_SHARED
+#define MS_SHARED (1<<20)
+#endif
+
+// When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit.
+#elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
+#define fstatat fstatat64
+int fstatat64(int dirfd, const char *pathname, void *buf, int flags);
+int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
+char *stpcpy(char *dest, const char *src);
+#include <sys/stat.h>
+int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
+int openat(int dirfd, const char *pathname, int flags, ...);
+#include <dirent.h>
+DIR *fdopendir(int fd);
+#include <unistd.h>
+int fchownat(int dirfd, const char *pathname,
+ uid_t owner, gid_t group, int flags);
+int isblank(int c);
+int unlinkat(int dirfd, const char *pathname, int flags);
+#include <stdio.h>
+ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
+
+// Straight from posix-2008, things old glibc had but didn't prototype
+
+int faccessat(int fd, const char *path, int amode, int flag);
+int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag);
+int mkdirat(int fd, const char *path, mode_t mode);
+int symlinkat(const char *path1, int fd, const char *path2);
+int mknodat(int fd, const char *path, mode_t mode, dev_t dev);
+#include <sys/time.h>
+int futimens(int fd, const struct timespec times[2]);
+int utimensat(int fd, const char *path, const struct timespec times[2], int flag);
+
+#ifndef MNT_DETACH
+#define MNT_DETACH 2
+#endif
+#endif // Old glibc
+
+#endif // glibc in general
+
+#if !defined(__GLIBC__) && !defined(__BIONIC__)
+// POSIX basename.
+#include <libgen.h>
+#endif
+
+// glibc was handled above; for 32-bit bionic we need to avoid a collision
+// with toybox's basename_r so we can't include <libgen.h> even though that
+// would give us a POSIX basename(3).
+#if defined(__BIONIC__)
+char *basename(char *path);
+char *dirname(char *path);
+#endif
+
+// Work out how to do endianness
#ifndef __APPLE__
#include <byteswap.h>
#define IS_BIG_ENDIAN 0
#endif
+int clearenv(void);
#else
#ifdef __BIG_ENDIAN__
#define SWAP_LE64(x) (x)
#endif
-// Some versions of gcc produce spurious "may be uninitialized" warnings in
-// cases where it provably can't happen. Unfortunately, although this warning
-// is calculated and produced separately from the "is definitely used
-// uninitialized" warnings, there's no way to turn off the broken spurious "may
-// be" warnings without also turning off the non-broken "is" warnings.
+#if defined(__APPLE__) \
+ || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10)
+ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
+ssize_t getline(char **lineptr, size_t *n, FILE *stream);
+#endif
-#if CFG_TOYBOX_DEBUG
-#define GCC_BUG =0
+// Linux headers not listed by POSIX or LSB
+#include <sys/mount.h>
+#include <sys/swap.h>
+
+// Android is missing some headers and functions
+// "generated/config.h" is included first
+#if CFG_TOYBOX_SHADOW
+#include <shadow.h>
+#endif
+#if CFG_TOYBOX_UTMPX
+#include <utmpx.h>
+#endif
+
+// Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
+#include <fcntl.h>
+#ifndef O_NOFOLLOW
+#define O_NOFOLLOW 0
+#endif
+
+#ifndef O_NOATIME
+#define O_NOATIME 01000000
+#endif
+
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 02000000
+#endif
+
+#ifndef O_PATH
+#define O_PATH 010000000
+#endif
+
+#if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \
+ && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__
+typedef double FLOAT;
#else
-#define GCC_BUG
+typedef float FLOAT;
#endif
+
+#ifndef __uClinux__
+pid_t xfork(void);
+#endif
+
+//#define strncpy(...) @@strncpyisbadmmkay@@
+//#define strncat(...) @@strncatisbadmmkay@@
+
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