[590] | 1 | //vio.c: |
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| 2 | |
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[690] | 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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| 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | * NOTE for everyone want's to change something and send patches: |
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| 24 | * read README and HACKING! There a addition information on |
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| 25 | * the license of this document you need to read before you send |
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| 26 | * any patches. |
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| 27 | * |
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| 28 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 29 | * or libpulse*: |
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| 30 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 31 | * and are therefore GPL. Because of this it may be illigal to use |
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| 32 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 33 | */ |
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| 34 | |
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[590] | 35 | #include "libroar.h" |
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| 36 | |
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[897] | 37 | // this is to avoid warning messages on platforms |
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| 38 | // where sizeof(void*) == 8 and szeof(int) == 4 |
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| 39 | #ifdef __LP64__ |
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| 40 | #define INSTINT long int |
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| 41 | #else |
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| 42 | #define INSTINT int |
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| 43 | #endif |
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| 44 | |
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[591] | 45 | int roar_vio_init_calls (struct roar_vio_calls * calls) { |
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| 46 | if ( !calls ) |
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| 47 | return -1; |
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| 48 | |
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| 49 | memset((void*)calls, 0, sizeof(struct roar_vio_calls)); |
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| 50 | |
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[881] | 51 | /* |
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[597] | 52 | calls->read = (ssize_t (*)(int fd, void *buf, size_t count, void * inst))read; |
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| 53 | calls->write = (ssize_t (*)(int fd, void *buf, size_t count, void * inst))write; |
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| 54 | calls->lseek = (off_t (*)(int fildes, off_t offset, int whence, void * inst))lseek; |
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[881] | 55 | */ |
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| 56 | |
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| 57 | calls->read = roar_vio_basic_read; |
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| 58 | calls->write = roar_vio_basic_write; |
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| 59 | calls->lseek = roar_vio_basic_lseek; |
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| 60 | |
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| 61 | return 0; |
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| 62 | } |
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| 63 | |
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| 64 | int roar_vio_set_inst (struct roar_vio_calls * vio, void * inst) { |
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| 65 | if ( vio == NULL ) |
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| 66 | return -1; |
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| 67 | |
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| 68 | vio->inst = inst; |
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[591] | 69 | |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |
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[881] | 73 | int roar_vio_set_fh (struct roar_vio_calls * vio, int fh) { |
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[897] | 74 | return roar_vio_set_inst(vio, (void*)(INSTINT)(fh + 1)); |
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[881] | 75 | } |
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| 76 | |
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| 77 | int roar_vio_get_fh (struct roar_vio_calls * vio) { |
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| 78 | if ( vio == NULL ) |
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| 79 | return -1; |
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| 80 | |
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[897] | 81 | return ((int)(INSTINT)vio->inst) - 1; |
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[881] | 82 | } |
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| 83 | |
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| 84 | |
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| 85 | ssize_t roar_vio_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 86 | if ( vio == NULL ) |
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| 87 | return -1; |
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| 88 | |
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| 89 | if ( vio->read == NULL ) |
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| 90 | return -1; |
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| 91 | |
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| 92 | return vio->read(vio, buf, count); |
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| 93 | } |
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| 94 | |
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| 95 | ssize_t roar_vio_write(struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 96 | if ( vio == NULL ) |
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| 97 | return -1; |
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| 98 | |
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| 99 | if ( vio->write == NULL ) |
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| 100 | return -1; |
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| 101 | |
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| 102 | return vio->write(vio, buf, count); |
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| 103 | } |
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| 104 | |
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| 105 | off_t roar_vio_lseek(struct roar_vio_calls * vio, off_t offset, int whence) { |
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| 106 | if ( vio == NULL ) |
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| 107 | return -1; |
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| 108 | |
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| 109 | if ( vio->lseek == NULL ) |
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| 110 | return -1; |
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| 111 | |
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| 112 | return vio->lseek(vio, offset, whence); |
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| 113 | } |
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| 114 | |
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[886] | 115 | // VIOs: |
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[881] | 116 | |
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[886] | 117 | // basic |
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[881] | 118 | ssize_t roar_vio_basic_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 119 | return read(roar_vio_get_fh(vio), buf, count); |
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| 120 | } |
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| 121 | |
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| 122 | ssize_t roar_vio_basic_write(struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 123 | return write(roar_vio_get_fh(vio), buf, count); |
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| 124 | } |
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| 125 | |
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| 126 | off_t roar_vio_basic_lseek(struct roar_vio_calls * vio, off_t offset, int whence) { |
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| 127 | return lseek(roar_vio_get_fh(vio), offset, whence); |
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| 128 | } |
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| 129 | |
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[943] | 130 | // null |
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| 131 | ssize_t roar_vio_null_rw (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 132 | if ( vio == NULL || buf == NULL ) |
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| 133 | return -1; |
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| 134 | |
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| 135 | return 0; |
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| 136 | } |
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| 137 | |
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[886] | 138 | // pass |
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| 139 | ssize_t roar_vio_pass_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 140 | return roar_vio_read((struct roar_vio_calls *) vio->inst, buf, count); |
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| 141 | } |
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| 142 | |
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| 143 | ssize_t roar_vio_pass_write(struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 144 | return roar_vio_write((struct roar_vio_calls *) vio->inst, buf, count); |
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| 145 | } |
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| 146 | |
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| 147 | off_t roar_vio_pass_lseek(struct roar_vio_calls * vio, off_t offset, int whence) { |
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| 148 | return roar_vio_lseek((struct roar_vio_calls *) vio->inst, offset, whence); |
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| 149 | } |
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| 150 | |
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| 151 | |
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| 152 | // re |
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| 153 | ssize_t roar_vio_re_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 154 | size_t len = 0; |
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| 155 | ssize_t r = -1; |
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| 156 | |
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| 157 | if ( vio == NULL ) |
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| 158 | return -1; |
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| 159 | |
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| 160 | if ( vio->inst == NULL ) |
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| 161 | return -1; |
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| 162 | |
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| 163 | errno = 0; |
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| 164 | |
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| 165 | while ( (r = roar_vio_read((struct roar_vio_calls *) vio->inst, buf, count)) > 0 ) { |
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| 166 | len += r; |
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| 167 | buf += r; |
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| 168 | count -= r; |
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| 169 | if ( count == 0 ) |
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| 170 | break; |
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| 171 | } |
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| 172 | |
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| 173 | if ( len == 0 && r == -1 ) |
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| 174 | return -1; |
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| 175 | |
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| 176 | return len; |
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| 177 | } |
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| 178 | |
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| 179 | ssize_t roar_vio_re_write(struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 180 | size_t len = 0; |
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| 181 | ssize_t r = -1; |
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| 182 | |
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| 183 | if ( vio == NULL ) |
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| 184 | return -1; |
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| 185 | |
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| 186 | if ( vio->inst == NULL ) |
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| 187 | return -1; |
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| 188 | |
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| 189 | errno = 0; |
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| 190 | |
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| 191 | while ( (r = roar_vio_write((struct roar_vio_calls *) vio->inst, buf, count)) > 0 ) { |
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| 192 | len += r; |
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| 193 | buf += r; |
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| 194 | count -= r; |
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| 195 | if ( count == 0 ) |
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| 196 | break; |
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| 197 | } |
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| 198 | |
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| 199 | if ( len == 0 && r == -1 ) |
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| 200 | return -1; |
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| 201 | |
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| 202 | return len; |
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| 203 | } |
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| 204 | |
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| 205 | // we should do a some more intelgent thing here. |
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| 206 | off_t roar_vio_re_lseek(struct roar_vio_calls * vio, off_t offset, int whence) { |
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| 207 | return roar_vio_lseek((struct roar_vio_calls *) vio->inst, offset, whence); |
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| 208 | } |
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| 209 | |
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| 210 | |
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[590] | 211 | //ll |
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