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2aa62f2b | 1 | /** @file\r |
2 | Implementation of fopen as declared in <stdio.h>.\r | |
3 | \r | |
0c1992fb | 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 | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
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: fopen.c,v 1.12 2003/08/07 16:43:24 agc Exp\r | |
44 | fopen.c 8.1 (Berkeley) 6/4/93"\r | |
45 | **/\r | |
46 | #include <LibConfig.h>\r | |
47 | #include <sys/EfiCdefs.h>\r | |
48 | \r | |
49 | #include <sys/types.h>\r | |
50 | #include <sys/stat.h>\r | |
51 | #include <assert.h>\r | |
52 | #include <fcntl.h>\r | |
2aa62f2b | 53 | #include <stdio.h>\r |
54 | #include <errno.h>\r | |
0c1992fb | 55 | #include <unistd.h>\r |
2aa62f2b | 56 | #include "reentrant.h"\r |
57 | #include "local.h"\r | |
58 | \r | |
59 | FILE *\r | |
60 | fopen(const char *file, const char *mode)\r | |
61 | {\r | |
62 | FILE *fp;\r | |
63 | int f;\r | |
64 | int flags, oflags;\r | |
65 | \r | |
66 | _DIAGASSERT(file != NULL);\r | |
67 | if ((flags = __sflags(mode, &oflags)) == 0)\r | |
68 | return (NULL);\r | |
69 | if ((fp = __sfp()) == NULL)\r | |
70 | return (NULL);\r | |
71 | if ((f = open(file, oflags, DEFFILEMODE)) < 0)\r | |
72 | goto release;\r | |
73 | if (oflags & O_NONBLOCK) {\r | |
74 | struct stat st;\r | |
75 | if (fstat(f, &st) == -1) {\r | |
76 | int sverrno = errno;\r | |
77 | (void)close(f);\r | |
78 | errno = sverrno;\r | |
79 | goto release;\r | |
80 | }\r | |
81 | if (!S_ISREG(st.st_mode)) {\r | |
82 | (void)close(f);\r | |
83 | errno = EFTYPE;\r | |
84 | goto release;\r | |
85 | }\r | |
86 | }\r | |
87 | fp->_file = (short)f;\r | |
88 | fp->_flags = (unsigned short)flags;\r | |
89 | fp->_cookie = fp;\r | |
90 | fp->_read = __sread;\r | |
91 | fp->_write = __swrite;\r | |
92 | fp->_seek = __sseek;\r | |
93 | fp->_close = __sclose;\r | |
94 | \r | |
95 | /*\r | |
96 | * When opening in append mode, even though we use O_APPEND,\r | |
97 | * we need to seek to the end so that ftell() gets the right\r | |
98 | * answer. If the user then alters the seek pointer, or\r | |
99 | * the file extends, this will fail, but there is not much\r | |
100 | * we can do about this. (We could set __SAPP and check in\r | |
101 | * fseek and ftell.)\r | |
102 | */\r | |
103 | if (oflags & O_APPEND)\r | |
104 | (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);\r | |
105 | return (fp);\r | |
106 | release:\r | |
107 | fp->_flags = 0; /* release */\r | |
108 | return (NULL);\r | |
109 | }\r |