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53e1e5c6 | 1 | /*\r |
a9c12422 | 2 | Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>\r |
53e1e5c6 | 3 | This program and the accompanying materials are licensed and made available\r |
4 | under the terms and conditions of the BSD License that accompanies this\r | |
5 | distribution. The full text of the license may be found at\r | |
6 | http://opensource.org/licenses/bsd-license.\r | |
7 | \r | |
8 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
9 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
2aa62f2b | 10 | \r |
2aa62f2b | 11 | * Copyright (c) 1990, 1993\r |
12 | * The Regents of the University of California. All rights reserved.\r | |
13 | *\r | |
14 | * This code is derived from software contributed to Berkeley by\r | |
15 | * Chris Torek.\r | |
16 | *\r | |
17 | * Redistribution and use in source and binary forms, with or without\r | |
18 | * modification, are permitted provided that the following conditions\r | |
19 | * are met:\r | |
20 | * 1. Redistributions of source code must retain the above copyright\r | |
21 | * notice, this list of conditions and the following disclaimer.\r | |
22 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
23 | * notice, this list of conditions and the following disclaimer in the\r | |
24 | * documentation and/or other materials provided with the distribution.\r | |
25 | * 3. Neither the name of the University nor the names of its contributors\r | |
26 | * may be used to endorse or promote products derived from this software\r | |
27 | * without specific prior written permission.\r | |
28 | *\r | |
29 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
39 | * SUCH DAMAGE.\r | |
53e1e5c6 | 40 | \r |
41 | NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp\r | |
42 | refill.c 8.1 (Berkeley) 6/4/93\r | |
43 | */\r | |
2aa62f2b | 44 | #include <LibConfig.h>\r |
45 | #include <sys/EfiCdefs.h>\r | |
2aa62f2b | 46 | \r |
47 | #include <assert.h>\r | |
48 | #include <errno.h>\r | |
49 | #include <stdio.h>\r | |
50 | #include <stdlib.h>\r | |
51 | #include "reentrant.h"\r | |
52 | #include "local.h"\r | |
53 | \r | |
54 | #ifdef _REENTRANT\r | |
55 | extern rwlock_t __sfp_lock;\r | |
56 | #endif\r | |
57 | \r | |
58 | static int lflush(FILE *);\r | |
59 | \r | |
60 | static int\r | |
61 | lflush(FILE *fp)\r | |
62 | {\r | |
63 | \r | |
53e1e5c6 | 64 | _DIAGASSERT(fp != NULL);\r |
65 | if(fp == NULL) {\r | |
66 | errno = EINVAL;\r | |
67 | return (EOF);\r | |
68 | }\r | |
2aa62f2b | 69 | \r |
70 | if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))\r | |
71 | return (__sflush(fp));\r | |
72 | return (0);\r | |
73 | }\r | |
74 | \r | |
75 | /*\r | |
76 | * Refill a stdio buffer.\r | |
77 | * Return EOF on eof or error, 0 otherwise.\r | |
78 | */\r | |
79 | int\r | |
80 | __srefill(FILE *fp)\r | |
81 | {\r | |
82 | \r | |
53e1e5c6 | 83 | _DIAGASSERT(fp != NULL);\r |
84 | if(fp == NULL) {\r | |
85 | errno = EINVAL;\r | |
86 | return (EOF);\r | |
87 | }\r | |
2aa62f2b | 88 | \r |
89 | /* make sure stdio is set up */\r | |
90 | if (!__sdidinit)\r | |
91 | __sinit();\r | |
92 | \r | |
2aa62f2b | 93 | fp->_r = 0; /* largely a convenience for callers */\r |
94 | \r | |
95 | /* SysV does not make this test; take it out for compatibility */\r | |
96 | if (fp->_flags & __SEOF) {\r | |
2aa62f2b | 97 | return (EOF);\r |
98 | }\r | |
99 | \r | |
100 | /* if not already reading, have to be reading and writing */\r | |
101 | if ((fp->_flags & __SRD) == 0) {\r | |
2aa62f2b | 102 | if ((fp->_flags & __SRW) == 0) {\r |
103 | errno = EBADF;\r | |
104 | fp->_flags |= __SERR; //<dvm> Allows differentiation between errors and EOF\r | |
2aa62f2b | 105 | return (EOF);\r |
106 | }\r | |
107 | /* switch to reading */\r | |
108 | if (fp->_flags & __SWR) {\r | |
109 | if (__sflush(fp)) {\r | |
2aa62f2b | 110 | return (EOF);\r |
111 | }\r | |
112 | fp->_flags &= ~__SWR;\r | |
113 | fp->_w = 0;\r | |
114 | fp->_lbfsize = 0;\r | |
115 | }\r | |
116 | fp->_flags |= __SRD;\r | |
117 | } else {\r | |
2aa62f2b | 118 | /*\r |
119 | * We were reading. If there is an ungetc buffer,\r | |
120 | * we must have been reading from that. Drop it,\r | |
121 | * restoring the previous buffer (if any). If there\r | |
122 | * is anything in that buffer, return.\r | |
123 | */\r | |
124 | if (HASUB(fp)) {\r | |
125 | FREEUB(fp);\r | |
126 | if ((fp->_r = fp->_ur) != 0) {\r | |
127 | fp->_p = fp->_up;\r | |
2aa62f2b | 128 | return (0);\r |
129 | }\r | |
130 | }\r | |
131 | }\r | |
132 | \r | |
133 | if (fp->_bf._base == NULL)\r | |
134 | __smakebuf(fp);\r | |
135 | \r | |
2aa62f2b | 136 | /*\r |
137 | * Before reading from a line buffered or unbuffered file,\r | |
138 | * flush all line buffered output files, per the ANSI C\r | |
139 | * standard.\r | |
140 | */\r | |
141 | if (fp->_flags & (__SLBF|__SNBF)) {\r | |
142 | rwlock_rdlock(&__sfp_lock);\r | |
143 | (void) _fwalk(lflush);\r | |
144 | rwlock_unlock(&__sfp_lock);\r | |
2aa62f2b | 145 | }\r |
146 | fp->_p = fp->_bf._base;\r | |
147 | fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);\r | |
148 | fp->_flags &= ~__SMOD; /* buffer contents are again pristine */\r | |
149 | if (fp->_r <= 0) {\r | |
150 | if (fp->_r == 0)\r | |
151 | fp->_flags |= __SEOF;\r | |
152 | else {\r | |
153 | fp->_r = 0;\r | |
154 | fp->_flags |= __SERR;\r | |
155 | }\r | |
2aa62f2b | 156 | return (EOF);\r |
157 | }\r | |
2aa62f2b | 158 | return (0);\r |
159 | }\r |