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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 #include <stdlib.h>
     31 
     32 #include "local.h"
     33 #include "private/libc_logging.h"
     34 
     35 size_t __fbufsize(FILE* fp) {
     36   return fp->_bf._size;
     37 }
     38 
     39 /* For a _SRW stream, we don't know whether we last read or wrote.
     40 int __freading(FILE* fp) {
     41   return (fp->_flags & _SRD) != 0 || ...;
     42 }
     43 */
     44 
     45 /* For a _SRW stream, we don't know whether we last read or wrote.
     46 int __fwriting(FILE*) {
     47   return (fp->_flags & _SWR) != 0 || ...;
     48 }
     49 */
     50 
     51 int __freadable(FILE* fp) {
     52   return (fp->_flags & (__SRD|__SRW)) != 0;
     53 }
     54 
     55 int __fwritable(FILE* fp) {
     56   return (fp->_flags & (__SWR|__SRW)) != 0;
     57 }
     58 
     59 int __flbf(FILE* fp) {
     60   return (fp->_flags & __SLBF) != 0;
     61 }
     62 
     63 void __fpurge(FILE* fp) {
     64   fpurge(fp);
     65 }
     66 
     67 size_t __fpending(FILE* fp) {
     68   return fp->_p - fp->_bf._base;
     69 }
     70 
     71 void _flushlbf() {
     72   // If we flush all streams, we know we've flushed all the line-buffered streams.
     73   fflush(NULL);
     74 }
     75 
     76 int __fsetlocking(FILE* fp, int type) {
     77   int old_state = _EXT(fp)->_stdio_handles_locking ? FSETLOCKING_INTERNAL : FSETLOCKING_BYCALLER;
     78   if (type == FSETLOCKING_QUERY) {
     79     return old_state;
     80   }
     81 
     82   if (type != FSETLOCKING_INTERNAL && type != FSETLOCKING_BYCALLER) {
     83     // The API doesn't let us report an error, so blow up.
     84     __libc_fatal("Bad type (%d) passed to __fsetlocking", type);
     85   }
     86 
     87   _EXT(fp)->_stdio_handles_locking = (type == FSETLOCKING_INTERNAL);
     88   return old_state;
     89 }
     90 
     91 void clearerr_unlocked(FILE* fp) {
     92   return __sclearerr(fp);
     93 }
     94 
     95 int feof_unlocked(FILE* fp) {
     96   return __sfeof(fp);
     97 }
     98 
     99 int ferror_unlocked(FILE* fp) {
    100   return __sferror(fp);
    101 }
    102