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Sprite 1984 - 1993
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Sprite 1984 - 1993.iso
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setvbuf.c,v
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1991-12-02
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201 lines
head 1.4;
branch ;
access ;
symbols sprited:1.4.1;
locks ; strict;
comment @ * @;
1.4
date 89.06.19.14.15.14; author jhh; state Exp;
branches 1.4.1.1;
next 1.3;
1.3
date 88.07.25.13.12.57; author ouster; state Exp;
branches ;
next 1.2;
1.2
date 88.06.27.11.20.57; author ouster; state Exp;
branches ;
next 1.1;
1.1
date 88.06.10.16.24.00; author ouster; state Exp;
branches ;
next ;
1.4.1.1
date 91.12.02.20.02.43; author kupfer; state Exp;
branches ;
next ;
desc
@@
1.4
log
@Made stderr buffer static
@
text
@/*
* setvbuf.c --
*
* Source code for the "setvbuf" library procedure.
*
* Copyright 1988 Regents of the University of California
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. The University of California
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#ifndef lint
static char rcsid[] = "$Header: /sprite/src/lib/c/stdio/RCS/setvbuf.c,v 1.3 88/07/25 13:12:57 ouster Exp Locker: jhh $ SPRITE (Berkeley)";
#endif not lint
#include <stdio.h>
#include <stdlib.h>
#include "fileInt.h"
/*
*----------------------------------------------------------------------
*
* setvbuf --
*
* This procedure may be used to amount of buffering used for
* a stdio stream. A buffer size of 0 or 1, or a mode of _IONBF,
* means the stream is unbuffered: each byte of I/O results in a
* system call. Needless to say, this is likely to be inefficient.
* A buffer size of N means that N characters are read from the
* system at a time, regardless of how many are actually needed,
* and on writes, nothing is written to the system until N bytes
* have accumulated, at which point all are written in one operation.
*
* Results:
* Returns 0 on success, -1 if there was an error in the arguments
* or if buffer space couldn't be setup properly.
*
* Side effects:
* The stream is modified to use size bytes of buffering.
* Old buffer space is returned to the storage allocator, if it
* was allocated by stdio rather than the client.
*
*----------------------------------------------------------------------
*/
int
setvbuf(stream, buf, mode, size)
register FILE *stream; /* Stream whose buffering is to be changed. */
char *buf; /* Buffer to use for stream. */
int mode; /* Mode for buffering: _IOFBF, _IOLBF, or
* _IONBF. */
int size; /* Number of characters of space in buffer;
* 0 or 1 means unbuffered. */
{
int result;
if (stream->readProc != (void (*)()) StdioFileReadProc) {
return -1;
}
result = fflush(stream);
/*
* Careful! Don't free the statically-allocated buffers for
* standard streams.
*/
if ((stream->buffer != stdioTempBuffer)
&& (stream->buffer != stdioStderrBuffer)
&& (stream->buffer != NULL)
&& !(stream->flags & STDIO_NOT_OUR_BUF)) {
free((char *) stream->buffer);
}
stream->flags &= ~(STDIO_LINEBUF|STDIO_NOT_OUR_BUF);
if (size < 1) {
size = 1;
}
if (mode == _IONBF) {
size = 1;
} else if (mode == _IOLBF) {
stream->flags |= STDIO_LINEBUF;
} else if (mode != _IOFBF) {
return -1;
}
if (buf != 0) {
stream->buffer = (unsigned char *) buf;
stream->flags |= STDIO_NOT_OUR_BUF;
} else {
stream->buffer = (unsigned char *) malloc((unsigned) size);
}
stream->bufSize = size;
stream->lastAccess = stream->buffer - 1;
stream->readCount = 0;
stream->writeCount = 0;
return result;
}
@
1.4.1.1
log
@Initial branch for Sprite server.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: /sprite/src/lib/c/stdio/RCS/setvbuf.c,v 1.4 89/06/19 14:15:14 jhh Exp $ SPRITE (Berkeley)";
@
1.3
log
@Lint.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: setvbuf.c,v 1.2 88/06/27 11:20:57 ouster Exp $ SPRITE (Berkeley)";
d73 1
@
1.2
log
@Was freeing buffers it shouldn't.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: setvbuf.c,v 1.1 88/06/10 16:24:00 ouster Exp $ SPRITE (Berkeley)";
d20 2
a21 1
#include "stdio.h"
@
1.1
log
@Initial revision
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: atoi.c,v 1.1 88/04/28 17:20:23 ouster Exp $ SPRITE (Berkeley)";
d21 1
d60 4
d71 4
a74 2
if ((stream->flags & STDIO_NOT_OUR_BUF) == 0) {
free((char *) stream->buffer);
@