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c84142e8 UD |
1 | /* Copyright (C) 1991, 1993, 1995, 1996, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
28f540f4 | 3 | |
c84142e8 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
c84142e8 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
c84142e8 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
28f540f4 RM |
19 | #include <stddef.h> |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
60092701 | 22 | #include <errno.h> |
28f540f4 RM |
23 | |
24 | ||
25 | /* Make STREAM use the buffering method given in MODE. | |
26 | If MODE indicates full or line buffering, use BUF, | |
27 | a buffer of SIZE bytes; if BUF is NULL, malloc a buffer. */ | |
28 | int | |
c4029823 UD |
29 | setvbuf (stream, buf, mode, size) |
30 | FILE *stream; | |
31 | char *buf; | |
32 | int mode; | |
33 | size_t size; | |
28f540f4 | 34 | { |
c4029823 | 35 | if (!__validfp (stream)) |
28f540f4 | 36 | { |
c4029823 | 37 | __set_errno (EINVAL); |
28f540f4 RM |
38 | return EOF; |
39 | } | |
40 | ||
41 | /* The ANSI standard says setvbuf can only be called before any I/O is done, | |
42 | but we allow it to replace an old buffer, flushing it first. */ | |
43 | if (stream->__buffer != NULL) | |
44 | { | |
c4029823 | 45 | (void) fflush (stream); |
28f540f4 RM |
46 | /* Free the old buffer if it was malloc'd. */ |
47 | if (!stream->__userbuf) | |
48 | free(stream->__buffer); | |
49 | } | |
50 | ||
51 | stream->__get_limit = stream->__put_limit = NULL; | |
52 | stream->__bufp = stream->__buffer = NULL; | |
53 | stream->__userbuf = stream->__linebuf = stream->__linebuf_active = 0; | |
54 | ||
55 | switch (mode) | |
56 | { | |
57 | default: | |
c4029823 | 58 | __set_errno (EINVAL); |
28f540f4 RM |
59 | return EOF; |
60 | case _IONBF: /* Unbuffered. */ | |
61 | stream->__buffer = NULL; | |
62 | stream->__bufsize = 0; | |
63 | stream->__userbuf = 1; | |
64 | break; | |
65 | case _IOLBF: /* Line buffered. */ | |
66 | stream->__linebuf = 1; | |
67 | case _IOFBF: /* Fully buffered. */ | |
68 | if (size == 0) | |
69 | { | |
c4029823 | 70 | __set_errno (EINVAL); |
28f540f4 RM |
71 | return EOF; |
72 | } | |
73 | stream->__bufsize = size; | |
74 | if (buf != NULL) | |
75 | stream->__userbuf = 1; | |
c4029823 | 76 | else if ((buf = (char *) malloc (size)) == NULL) |
28f540f4 RM |
77 | return EOF; |
78 | stream->__buffer = buf; | |
79 | break; | |
80 | } | |
81 | ||
82 | stream->__bufp = stream->__buffer; | |
83 | stream->__get_limit = stream->__buffer; | |
84 | /* The next output operation will prime the stream for writing. */ | |
85 | stream->__put_limit = stream->__buffer; | |
86 | ||
87 | return 0; | |
88 | } |