Annotation of prex/usr/lib/libc/stdio/putc.c, Revision 1.1
1.1 ! nbrk 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: */
! 32:
! 33: #include <stdio.h>
! 34: #include "local.h"
! 35:
! 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
! 42: __swbuf(c, fp)
! 43: int c;
! 44: FILE *fp;
! 45: {
! 46: int n;
! 47:
! 48: if (cantwrite(fp))
! 49: return (EOF);
! 50: c = (unsigned char)c;
! 51:
! 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: */
! 61: n = fp->_p - fp->_bf._base;
! 62: if (n >= fp->_bf._size) {
! 63: if (fflush(fp))
! 64: return (EOF);
! 65: n = 0;
! 66: }
! 67: 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: }
! 74:
! 75: int
! 76: putc(c, fp)
! 77: int c;
! 78: FILE *fp;
! 79: {
! 80: if (--fp->_w >= 0)
! 81: return (*fp->_p++ = c);
! 82: else
! 83: return (__swbuf(c, fp));
! 84: }
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