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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <stdio_ext.h>
     30 
     31 #include <errno.h>
     32 #include <stdlib.h>
     33 
     34 #include "local.h"
     35 #include "private/libc_logging.h"
     36 
     37 size_t __fbufsize(FILE* fp) {
     38   return fp->_bf._size;
     39 }
     40 
     41 /* For a _SRW stream, we don't know whether we last read or wrote.
     42 int __freading(FILE* fp) {
     43   return (fp->_flags & _SRD) != 0 || ...;
     44 }
     45 */
     46 
     47 /* For a _SRW stream, we don't know whether we last read or wrote.
     48 int __fwriting(FILE*) {
     49   return (fp->_flags & _SWR) != 0 || ...;
     50 }
     51 */
     52 
     53 int __freadable(FILE* fp) {
     54   return (fp->_flags & (__SRD|__SRW)) != 0;
     55 }
     56 
     57 int __fwritable(FILE* fp) {
     58   return (fp->_flags & (__SWR|__SRW)) != 0;
     59 }
     60 
     61 int __flbf(FILE* fp) {
     62   return (fp->_flags & __SLBF) != 0;
     63 }
     64 
     65 void __fpurge(FILE* fp) {
     66   fpurge(fp);
     67 }
     68 
     69 size_t __fpending(FILE* fp) {
     70   return fp->_p - fp->_bf._base;
     71 }
     72 
     73 void _flushlbf() {
     74   // If we flush all streams, we know we've flushed all the line-buffered streams.
     75   fflush(NULL);
     76 }
     77 
     78 int __fsetlocking(FILE* fp, int type) {
     79   int old_state = _EXT(fp)->_caller_handles_locking ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
     80   if (type == FSETLOCKING_QUERY) {
     81     return old_state;
     82   }
     83 
     84   if (type != FSETLOCKING_INTERNAL && type != FSETLOCKING_BYCALLER) {
     85     // The API doesn't let us report an error, so blow up.
     86     __libc_fatal("Bad type (%d) passed to __fsetlocking", type);
     87   }
     88 
     89   _EXT(fp)->_caller_handles_locking = (type == FSETLOCKING_BYCALLER);
     90   return old_state;
     91 }
     92 
     93 void clearerr_unlocked(FILE* fp) {
     94   return __sclearerr(fp);
     95 }
     96 
     97 int feof_unlocked(FILE* fp) {
     98   return __sfeof(fp);
     99 }
    100 
    101 int ferror_unlocked(FILE* fp) {
    102   return __sferror(fp);
    103 }
    104 
    105 int fileno_unlocked(FILE* fp) {
    106   int fd = fp->_file;
    107   if (fd == -1) {
    108     errno = EBADF;
    109     return -1;
    110   }
    111   return fd;
    112 }
    113