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2aa62f2b | 1 | /** @file\r |
2 | Implementation of fread as declared in <stdio.h>.\r | |
3 | \r | |
53e1e5c6 | 4 | Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r |
2aa62f2b | 5 | This program and the accompanying materials are licensed and made available\r |
6 | under the terms and conditions of the BSD License that accompanies this\r | |
7 | distribution. The full text of the license may be found at\r | |
53e1e5c6 | 8 | http://opensource.org/licenses/bsd-license.\r |
2aa62f2b | 9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Copyright (c) 1990, 1993\r | |
14 | The Regents of the University of California. All rights reserved.\r | |
15 | \r | |
16 | This code is derived from software contributed to Berkeley by\r | |
17 | Chris Torek.\r | |
18 | \r | |
19 | Redistribution and use in source and binary forms, with or without\r | |
20 | modification, are permitted provided that the following conditions\r | |
21 | are met:\r | |
22 | - Redistributions of source code must retain the above copyright\r | |
23 | notice, this list of conditions and the following disclaimer.\r | |
24 | - Redistributions in binary form must reproduce the above copyright\r | |
25 | notice, this list of conditions and the following disclaimer in the\r | |
26 | documentation and/or other materials provided with the distribution.\r | |
27 | - Neither the name of the University nor the names of its contributors\r | |
28 | may be used to endorse or promote products derived from this software\r | |
29 | without specific prior written permission.\r | |
30 | \r | |
31 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"\r | |
32 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
33 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
34 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE\r | |
35 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r | |
36 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r | |
37 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r | |
38 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r | |
39 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r | |
40 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r | |
41 | POSSIBILITY OF SUCH DAMAGE.\r | |
42 | \r | |
43 | NetBSD: fread.c,v 1.16 2003/08/07 16:43:25 agc Exp\r | |
44 | fread.c 8.2 (Berkeley) 12/11/93\r | |
45 | **/\r | |
46 | #include <LibConfig.h>\r | |
47 | \r | |
48 | #include <assert.h>\r | |
49 | #include <errno.h>\r | |
50 | #include <stdio.h>\r | |
51 | #include <string.h>\r | |
52 | #include "reentrant.h"\r | |
53 | #include "local.h"\r | |
54 | \r | |
55 | size_t\r | |
56 | fread(void *buf, size_t size, size_t count, FILE *fp)\r | |
57 | {\r | |
58 | size_t resid;\r | |
59 | char *p;\r | |
60 | int r;\r | |
61 | size_t total;\r | |
62 | \r | |
63 | _DIAGASSERT(fp != NULL);\r | |
53e1e5c6 | 64 | if(fp == NULL) {\r |
65 | errno = EINVAL;\r | |
66 | return (0);\r | |
67 | }\r | |
2aa62f2b | 68 | /*\r |
69 | * The ANSI standard requires a return value of 0 for a count\r | |
70 | * or a size of 0. Whilst ANSI imposes no such requirements on\r | |
71 | * fwrite, the SUSv2 does.\r | |
72 | */\r | |
73 | if ((resid = count * size) == 0)\r | |
74 | return (0);\r | |
75 | \r | |
76 | _DIAGASSERT(buf != NULL);\r | |
77 | \r | |
78 | FLOCKFILE(fp);\r | |
79 | if (fp->_r < 0)\r | |
80 | fp->_r = 0;\r | |
81 | total = resid;\r | |
82 | p = buf;\r | |
83 | while (resid > (size_t)(r = fp->_r)) {\r | |
84 | (void)memcpy((void *)p, (void *)fp->_p, (size_t)r);\r | |
85 | fp->_p += r;\r | |
86 | /* fp->_r = 0 ... done in __srefill */\r | |
87 | p += r;\r | |
88 | resid -= r;\r | |
89 | if (__srefill(fp)) {\r | |
90 | /* no more input: return partial result */\r | |
91 | FUNLOCKFILE(fp);\r | |
92 | return ((total - resid) / size);\r | |
93 | }\r | |
94 | }\r | |
95 | (void)memcpy((void *)p, (void *)fp->_p, resid);\r | |
96 | fp->_r -= (int)resid;\r | |
97 | fp->_p += resid;\r | |
98 | FUNLOCKFILE(fp);\r | |
99 | return (count);\r | |
100 | }\r |