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