/* $OpenBSD: local.h,v 1.12 2005/10/10 17:37:44 espie Exp $ */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #pragma once #include #include #include #if defined(__cplusplus) // Until we fork all of stdio... #include "private/bionic_fortify.h" #endif /* * Information local to this implementation of stdio, * in particular, macros and private variables. */ __BEGIN_DECLS struct __sbuf { unsigned char* _base; #if defined(__LP64__) size_t _size; #else int _size; #endif }; struct __sFILE { unsigned char* _p; /* current position in (some) buffer */ int _r; /* read space left for getc() */ int _w; /* write space left for putc() */ #if defined(__LP64__) int _flags; /* flags, below; this FILE is free if 0 */ int _file; /* fileno, if Unix descriptor, else -1 */ #else short _flags; /* flags, below; this FILE is free if 0 */ short _file; /* fileno, if Unix descriptor, else -1 */ #endif struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ int _lbfsize; /* 0 or -_bf._size, for inline putc */ // Function pointers used by `funopen`. // Note that `_seek` is ignored if `_seek64` (in __sfileext) is set. // TODO: NetBSD has `funopen2` which corrects the `int`s to `size_t`s. // TODO: glibc has `fopencookie` which passes the function pointers in a struct. void* _cookie; /* cookie passed to io functions */ int (*_close)(void*); int (*_read)(void*, char*, int); fpos_t (*_seek)(void*, fpos_t, int); int (*_write)(void*, const char*, int); /* extension data, to avoid further ABI breakage */ struct __sbuf _ext; /* data for long sequences of ungetc() */ unsigned char* _up; /* saved _p when _p is doing ungetc data */ int _ur; /* saved _r when _r is counting ungetc data */ /* tricks to meet minimum requirements even when malloc() fails */ unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ unsigned char _nbuf[1]; /* guarantee a getc() buffer */ /* separate buffer for fgetln() when line crosses buffer boundary */ struct __sbuf _lb; /* buffer for fgetln() */ /* Unix stdio files get aligned to block boundaries on fseek() */ int _blksize; /* stat.st_blksize (may be != _bf._size) */ fpos_t _unused_0; // This was the `_offset` field (see below). // Do not add new fields here. (Or remove or change the size of any above.) // Although bionic currently exports `stdin`, `stdout`, and `stderr` symbols, // that still hasn't made it to the NDK. All NDK-built apps index directly // into an array of this struct (which was in historically), so if // you need to make any changes, they need to be in the `__sfileext` struct // below, and accessed via `_EXT`. }; /* minimal requirement of SUSv2 */ #define WCIO_UNGETWC_BUFSIZE 1 struct wchar_io_data { mbstate_t wcio_mbstate_in; mbstate_t wcio_mbstate_out; wchar_t wcio_ungetwc_buf[WCIO_UNGETWC_BUFSIZE]; size_t wcio_ungetwc_inbuf; int wcio_mode; /* orientation */ }; struct __sfileext { // ungetc buffer. struct __sbuf _ub; // Wide char io status. struct wchar_io_data _wcio; // File lock. pthread_mutex_t _lock; // __fsetlocking support. bool _caller_handles_locking; // Equivalent to `_seek` but for _FILE_OFFSET_BITS=64. // Callers should use this but fall back to `__sFILE::_seek`. off64_t (*_seek64)(void*, off64_t, int); // The pid of the child if this FILE* is from popen(3). pid_t _popen_pid; }; // Values for `__sFILE::_flags`. #define __SLBF 0x0001 // Line buffered. #define __SNBF 0x0002 // Unbuffered. // __SRD and __SWR are mutually exclusive because they indicate what we did last. // If you want to know whether we were opened read-write, check __SRW instead. #define __SRD 0x0004 // Last operation was read. #define __SWR 0x0008 // Last operation was write. #define __SRW 0x0010 // Was opened for reading & writing. #define __SEOF 0x0020 // Found EOF. #define __SERR 0x0040 // Found error. #define __SMBF 0x0080 // `_buf` is from malloc. // #define __SAPP 0x0100 --- historical (fdopen()ed in append mode). #define __SSTR 0x0200 // This is an sprintf/snprintf string. // #define __SOPT 0x0400 --- historical (do fseek() optimization). // #define __SNPT 0x0800 --- historical (do not do fseek() optimization). // #define __SOFF 0x1000 --- historical (set iff _offset is in fact correct). // #define __SMOD 0x2000 --- historical (set iff fgetln modified _p text). #define __SALC 0x4000 // Allocate string space dynamically. #define __SIGN 0x8000 // Ignore this file in _fwalk. // TODO: remove remaining references to these obsolete flags (see above). #define __SMOD 0 #define __SNPT 0 #define __SOPT 0 #define _EXT(fp) __BIONIC_CAST(reinterpret_cast, struct __sfileext*, (fp)->_ext._base) #define _UB(fp) _EXT(fp)->_ub #define _FLOCK(fp) _EXT(fp)->_lock #define _FILEEXT_SETUP(fp, fext) \ do { \ (fp)->_ext._base = __BIONIC_CAST(reinterpret_cast, unsigned char*, fext); \ memset(_EXT(fp), 0, sizeof(struct __sfileext)); \ _EXT(fp)->_caller_handles_locking = true; \ } while (0) // Android <= 19 had getc/putc macros in that referred // to __srget/__swbuf, so those symbols need to be public for LP32 // but can be hidden for LP64. Moreover, the NDK continued to ship // those macros until r15 made unified headers the default. __LIBC32_LEGACY_PUBLIC__ int __srget(FILE*); __LIBC32_LEGACY_PUBLIC__ int __swbuf(int, FILE*); __LIBC32_LEGACY_PUBLIC__ int __srefill(FILE*); /* This was referenced by the apportable middleware for LP32. */ __LIBC32_LEGACY_PUBLIC__ int __swsetup(FILE*); /* These were referenced by a couple of different pieces of middleware and the Crystax NDK. */ __LIBC32_LEGACY_PUBLIC__ int __sflags(const char*, int*); __LIBC32_LEGACY_PUBLIC__ FILE* __sfp(void); __LIBC32_LEGACY_PUBLIC__ void __smakebuf(FILE*); /* These are referenced by the Greed for Glory franchise. */ __LIBC32_LEGACY_PUBLIC__ int __sflush(FILE*); __LIBC32_LEGACY_PUBLIC__ int __sread(void*, char*, int); __LIBC32_LEGACY_PUBLIC__ int __swrite(void*, const char*, int); __LIBC32_LEGACY_PUBLIC__ fpos_t __sseek(void*, fpos_t, int); __LIBC32_LEGACY_PUBLIC__ int __sclose(void*); __LIBC32_LEGACY_PUBLIC__ int _fwalk(int (*)(FILE*)); off64_t __sseek64(void*, off64_t, int); int __sflush_locked(FILE*); int __swhatbuf(FILE*, size_t*, int*); wint_t __fgetwc_unlock(FILE*); wint_t __ungetwc(wint_t, FILE*); int __vfprintf(FILE*, const char*, va_list); int __svfscanf(FILE*, const char*, va_list); int __vfwprintf(FILE*, const wchar_t*, va_list); int __vfwscanf(FILE*, const wchar_t*, va_list); /* * Return true if the given FILE cannot be written now. */ #define cantwrite(fp) ((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && __swsetup(fp)) /* * Test whether the given stdio file has an active ungetc buffer; * release such a buffer, without restoring ordinary unread data. */ #define HASUB(fp) (_UB(fp)._base != NULL) #define FREEUB(fp) \ { \ if (_UB(fp)._base != (fp)->_ubuf) free(_UB(fp)._base); \ _UB(fp)._base = NULL; \ } #define FLOCKFILE(fp) \ if (!_EXT(fp)->_caller_handles_locking) flockfile(fp) #define FUNLOCKFILE(fp) \ if (!_EXT(fp)->_caller_handles_locking) funlockfile(fp) /* OpenBSD exposes these in , but we only want them exposed to the implementation. */ #define __sferror(p) (((p)->_flags & __SERR) != 0) #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR | __SEOF))) #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) /* OpenBSD declares these in fvwrite.h, but we share them with C++ parts of the implementation. */ struct __siov { void* iov_base; size_t iov_len; }; struct __suio { struct __siov* uio_iov; int uio_iovcnt; size_t uio_resid; }; int __sfvwrite(FILE*, struct __suio*); wint_t __fputwc_unlock(wchar_t wc, FILE* fp); /* Remove the if (!__sdidinit) __sinit() idiom from untouched upstream stdio code. */ extern void __sinit(void); // Not actually implemented. #define __sdidinit 1 size_t parsefloat(FILE*, char*, char*); size_t wparsefloat(FILE*, wchar_t*, wchar_t*); // Sanity check a FILE* for nullptr, so we can emit a message while crashing // instead of doing a blind null-dereference. #define CHECK_FP(fp) \ if (fp == nullptr) __fortify_fatal("%s: null FILE*", __FUNCTION__) /* * Floating point scanf/printf (input/output) definitions. */ /* 11-bit exponent (VAX G floating point) is 308 decimal digits */ #define MAXEXP 308 /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */ #define MAXFRACT 39 /* * MAXEXPDIG is the maximum number of decimal digits needed to store a * floating point exponent in the largest supported format. It should * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point * conversions are supported, ceil(log10(LDBL_MAX_EXP)). But since it * is presently never greater than 5 in practice, we fudge it. */ #define MAXEXPDIG 6 #if LDBL_MAX_EXP > 999999 #error "floating point buffers too small" #endif char* __hdtoa(double, const char*, int, int*, int*, char**); char* __hldtoa(long double, const char*, int, int*, int*, char**); char* __ldtoa(long double*, int, int, int*, int*, char**); #define WCIO_GET(fp) (_EXT(fp) ? &(_EXT(fp)->_wcio) : (struct wchar_io_data*)0) #define _SET_ORIENTATION(fp, mode) \ do { \ struct wchar_io_data* _wcio = WCIO_GET(fp); \ if (_wcio && _wcio->wcio_mode == 0) _wcio->wcio_mode = (mode); \ } while (0) #define WCIO_FREE(fp) \ do { \ struct wchar_io_data* _wcio = WCIO_GET(fp); \ if (_wcio) { \ _wcio->wcio_mode = 0; \ _wcio->wcio_ungetwc_inbuf = 0; \ } \ } while (0) __END_DECLS