Annotation of prex/usr/lib/libc/stdio/setvbuf.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 <stdlib.h>
! 35: #include "local.h"
! 36:
! 37: /*
! 38: * Set one of the three kinds of buffering, optionally including
! 39: * a buffer.
! 40: */
! 41: int
! 42: setvbuf(fp, buf, mode, size)
! 43: FILE *fp;
! 44: char *buf;
! 45: int mode;
! 46: size_t size;
! 47: {
! 48: int ret, flags;
! 49: /* int ttyflag; */
! 50:
! 51: /*
! 52: * Verify arguments. The `int' limit on `size' is due to this
! 53: * particular implementation. Note, buf and size are ignored
! 54: * when setting _IONBF.
! 55: */
! 56: if (mode != _IONBF)
! 57: if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
! 58: return (EOF);
! 59:
! 60: /*
! 61: * Write current buffer, if any. Discard unread input (including
! 62: * ungetc data), cancel line buffering, and free old buffer if
! 63: * malloc()ed. We also clear any eof condition, as if this were
! 64: * a seek.
! 65: */
! 66: ret = 0;
! 67: (void)__sflush(fp);
! 68: if (HASUB(fp))
! 69: FREEUB(fp);
! 70: fp->_r = 0;
! 71: flags = fp->_flags;
! 72: if (buf != NULL && (flags & __SMBF))
! 73: free((void *)fp->_bf._base);
! 74: flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);
! 75:
! 76: /*
! 77: * Fix up the FILE fields, and set __cleanup for output flush on
! 78: * exit (since we are buffered in some way).
! 79: */
! 80: if (mode == _IOLBF)
! 81: flags |= __SLBF;
! 82: fp->_flags = flags;
! 83:
! 84: /*
! 85: * If buffer is NULL, we change only buffering mode.
! 86: */
! 87: if (buf == NULL)
! 88: return 0;
! 89:
! 90: fp->_bf._base = fp->_p = (unsigned char *)buf;
! 91: fp->_bf._size = size;
! 92: fp->_w = 0;
! 93: __cleanup = _cleanup;
! 94:
! 95: return (ret);
! 96: }
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