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root/usr/lib/libc/stdio/putc.c

DEFINITIONS

1. __swbuf
2. putc

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  33 #include <stdio.h>
  34 #include "local.h"
  36 /*
  37  * Write the given character into the (probably full) buffer for
  38  * the given file.  Flush the buffer out if it is or becomes full,
  39  * or if c=='\n' and the file is line buffered.
  40  */
  41 int
__swbuf(c, fp)
  43         int c;
FILE *fp;
  45 {
  46         int n;
  48         if (cantwrite(fp))
  49                 return (EOF);
c = (unsigned char)c;
  52         /*
  53          * If it is completely full, flush it out.  Then, in any case,
  54          * stuff c into the buffer.  If this causes the buffer to fill
  55          * completely, or if c is '\n' and the file is line buffered,
  56          * flush it (perhaps a second time).  The second flush will always
  57          * happen on unbuffered streams, where _bf._size==1; fflush()
  58          * guarantees that putc() will always call wbuf() by setting _w
  59          * to 0, so we need not do anything else.
  60          */
n = fp->_p - fp->_bf._base;
  62         if (n >= fp->_bf._size) {
  63                 if (fflush(fp))
  64                         return (EOF);
n = 0;
  66         }
fp->_w--;
  68         *fp->_p++ = c;
  69         if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))
  70                 if (fflush(fp))
  71                         return (EOF);
  72         return (c);
  73 }
  75 int
putc(c, fp)
  77         int c;
FILE *fp;
  79 {
  80         if (--fp->_w >= 0)
  81                 return (*fp->_p++ = c);
  82         else
  83                 return (__swbuf(c, fp));
  84 }