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2 | pj | 1 | /*- |
2 | * Copyright (c) 1990, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * This code is derived from software contributed to Berkeley by |
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6 | * Chris Torek. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * 3. All advertising materials mentioning features or use of this software |
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17 | * must display the following acknowledgement: |
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18 | * This product includes software developed by the University of |
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19 | * California, Berkeley and its contributors. |
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20 | * 4. Neither the name of the University nor the names of its contributors |
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21 | * may be used to endorse or promote products derived from this software |
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22 | * without specific prior written permission. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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34 | * SUCH DAMAGE. |
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35 | */ |
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36 | |||
37 | #if defined(LIBC_SCCS) && !defined(lint) |
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38 | #if 0 |
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39 | static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; |
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40 | #endif |
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41 | static const char rcsid[] = |
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42 | "$\Id: stdio.c,v 1.4 1996/06/22 10:33:57 jraynard Exp $"; |
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43 | #endif /* LIBC_SCCS and not lint */ |
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44 | |||
45 | #include <fcntl.h> |
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46 | #include <unistd.h> |
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47 | #include <stdio.h> |
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48 | #include "local.h" |
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49 | |||
50 | /* |
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51 | * Small standard I/O/seek/close functions. |
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52 | * These maintain the `known seek offset' for seek optimisation. |
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53 | */ |
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54 | int |
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55 | __sread(cookie, buf, n) |
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56 | void *cookie; |
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57 | char *buf; |
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58 | int n; |
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59 | { |
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60 | register FILE *fp = cookie; |
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61 | register int ret; |
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62 | |||
63 | ret = read(fp->_file, buf, (size_t)n); |
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64 | /* if the read succeeded, update the current offset */ |
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65 | if (ret >= 0) |
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66 | fp->_offset += ret; |
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67 | else |
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68 | fp->_flags &= ~__SOFF; /* paranoia */ |
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69 | return (ret); |
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70 | } |
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71 | |||
72 | int |
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73 | __swrite(cookie, buf, n) |
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74 | void *cookie; |
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75 | char const *buf; |
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76 | int n; |
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77 | { |
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78 | register FILE *fp = cookie; |
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79 | |||
80 | if (fp->_flags & __SAPP) |
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81 | (void) lseek(fp->_file, (off_t)0, SEEK_END); |
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82 | fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ |
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83 | return (write(fp->_file, buf, (size_t)n)); |
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84 | } |
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85 | |||
86 | fpos_t |
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87 | __sseek(cookie, offset, whence) |
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88 | void *cookie; |
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89 | fpos_t offset; |
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90 | int whence; |
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91 | { |
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92 | register FILE *fp = cookie; |
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93 | register off_t ret; |
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94 | |||
95 | ret = lseek(fp->_file, (off_t)offset, whence); |
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96 | if (ret == -1) |
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97 | fp->_flags &= ~__SOFF; |
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98 | else { |
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99 | fp->_flags |= __SOFF; |
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100 | fp->_offset = ret; |
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101 | } |
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102 | return (ret); |
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103 | } |
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104 | |||
105 | int |
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106 | __sclose(cookie) |
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107 | void *cookie; |
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108 | { |
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109 | |||
110 | return (close(((FILE *)cookie)->_file)); |
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111 | } |