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2aa62f2b | 1 | /* $NetBSD: ftello.c,v 1.4 2003/08/07 16:43:26 agc Exp $ */\r |
2 | \r | |
3 | /*-\r | |
4 | * Copyright (c) 1990, 1993\r | |
5 | * The Regents of the University of California. All rights reserved.\r | |
6 | *\r | |
7 | * This code is derived from software contributed to Berkeley by\r | |
8 | * Chris Torek.\r | |
9 | *\r | |
10 | * Redistribution and use in source and binary forms, with or without\r | |
11 | * modification, are permitted provided that the following conditions\r | |
12 | * are met:\r | |
13 | * 1. Redistributions of source code must retain the above copyright\r | |
14 | * notice, this list of conditions and the following disclaimer.\r | |
15 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
16 | * notice, this list of conditions and the following disclaimer in the\r | |
17 | * documentation and/or other materials provided with the distribution.\r | |
18 | * 3. Neither the name of the University nor the names of its contributors\r | |
19 | * may be used to endorse or promote products derived from this software\r | |
20 | * without specific prior written permission.\r | |
21 | *\r | |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
32 | * SUCH DAMAGE.\r | |
33 | */\r | |
34 | #include <LibConfig.h>\r | |
35 | #include <sys/EfiCdefs.h>\r | |
36 | #if defined(LIBC_SCCS) && !defined(lint)\r | |
37 | __RCSID("$NetBSD: ftello.c,v 1.4 2003/08/07 16:43:26 agc Exp $");\r | |
38 | #endif /* LIBC_SCCS and not lint */\r | |
39 | \r | |
40 | #include "namespace.h"\r | |
41 | #include <assert.h>\r | |
42 | #include <errno.h>\r | |
43 | #include <stdio.h>\r | |
44 | #include "reentrant.h"\r | |
45 | #include "local.h"\r | |
46 | \r | |
47 | #ifdef __weak_alias\r | |
48 | __weak_alias(ftello, _ftello)\r | |
49 | #endif\r | |
50 | \r | |
51 | /*\r | |
52 | * ftell: return current offset.\r | |
53 | */\r | |
54 | off_t\r | |
55 | ftello(FILE *fp)\r | |
56 | {\r | |
57 | fpos_t pos;\r | |
58 | \r | |
59 | FLOCKFILE(fp);\r | |
60 | \r | |
61 | if (fp->_seek == NULL) {\r | |
62 | FUNLOCKFILE(fp);\r | |
63 | errno = ESPIPE; /* historic practice */\r | |
64 | return ((off_t)-1);\r | |
65 | }\r | |
66 | \r | |
67 | /*\r | |
68 | * Find offset of underlying I/O object, then\r | |
69 | * adjust for buffered bytes.\r | |
70 | */\r | |
71 | __sflush(fp); /* may adjust seek offset on append stream */\r | |
72 | if (fp->_flags & __SOFF)\r | |
73 | pos = fp->_offset;\r | |
74 | else {\r | |
75 | pos = (*fp->_seek)(fp->_cookie, (fpos_t)0, SEEK_CUR);\r | |
76 | if (pos == (fpos_t)-1) {\r | |
77 | FUNLOCKFILE(fp);\r | |
78 | return (pos);\r | |
79 | }\r | |
80 | }\r | |
81 | if (fp->_flags & __SRD) {\r | |
82 | /*\r | |
83 | * Reading. Any unread characters (including\r | |
84 | * those from ungetc) cause the position to be\r | |
85 | * smaller than that in the underlying object.\r | |
86 | */\r | |
87 | pos -= fp->_r;\r | |
88 | if (HASUB(fp))\r | |
89 | pos -= fp->_ur;\r | |
90 | } else if (fp->_flags & __SWR && fp->_p != NULL) {\r | |
91 | /*\r | |
92 | * Writing. Any buffered characters cause the\r | |
93 | * position to be greater than that in the\r | |
94 | * underlying object.\r | |
95 | */\r | |
96 | pos += fp->_p - fp->_bf._base;\r | |
97 | }\r | |
98 | FUNLOCKFILE(fp);\r | |
99 | return (pos);\r | |
100 | }\r |