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annotate packages/language/c/libc/stdio/current/src/common/streambuf.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===========================================================================
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2 //
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3 // streambuf.cxx
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4 //
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5 // C library stdio stream buffer functions
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6 //
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7 //===========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //===========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jlarmour
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43 // Contributors:
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44 // Date: 2000-04-20
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45 // Purpose:
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46 // Description:
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47 // Usage:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //===========================================================================
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52
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53 // CONFIGURATION
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54
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55 #include <pkgconf/libc_stdio.h> // Configuration header
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56
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57 // Include buffered I/O?
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58 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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59
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60
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61 // INCLUDES
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62
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63 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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64 #include <cyg/infra/cyg_ass.h> // Assertion support
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65 #include <errno.h> // Cyg_ErrNo
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66 #include <stdlib.h> // malloc() and free()
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67 #include <cyg/libc/stdio/streambuf.hxx> // header for this file, just in case
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68
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69 // FUNCTIONS
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70
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71 Cyg_ErrNo
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72 Cyg_StdioStreamBuffer::set_buffer( cyg_ucount32 size,
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73 cyg_uint8 *new_buffer )
115
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74 {
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75
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76 #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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77
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78 // user-supplied buffer?
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79 if (new_buffer != NULL) {
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80 CYG_CHECK_DATA_PTR(new_buffer, "new_buffer not valid");
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81 #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
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82 // first check if we were responsible for the old buffer
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83 if (call_free) {
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84 free(buffer_bottom);
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85 call_free = false;
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86 }
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87 #endif
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88 buffer_bottom = new_buffer;
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89 }
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90 #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
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91 else if ( size != buffer_size ) { // as long as its different from
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92 // what we've got now
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93 cyg_uint8 *malloced_buf;
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94
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95 malloced_buf = (cyg_uint8 * )malloc( size );
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96 if (malloced_buf == NULL)
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97 return ENOMEM;
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98
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99 // should the old buffer be freed? This waits till after we know
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100 // whether the malloc succeeded
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101 if (call_free)
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102 free( buffer_bottom );
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103
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104 buffer_bottom = malloced_buf;
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105
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106 call_free=true;
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107
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108 } // else if
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109 #else
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110 // Here we have not been given a new buffer, but have been given
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111 // a new buffer size. If possible, we just shrink what we already
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112 // have.
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113 else if( size > buffer_size )
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114 return EINVAL;
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115 #endif
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116
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117 #else // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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118
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119 // In this config we can't use a different buffer, or set a
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120 // size greater than now. We can pretend to shrink it though
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121
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122 // Note on the next line we compare it with the size of static_buffer
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123 // and not the current size, as that's what is the limiting factor
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124 if ( (new_buffer != NULL) || (size > sizeof(static_buffer)) )
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125 return EINVAL;
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126
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127 #endif // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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128
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129 buffer_top = current_buffer_position = &buffer_bottom[0];
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130 buffer_size = size;
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131
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132 return ENOERR;
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133
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134 } // set_buffer()
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135
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136
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137 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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138
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139
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140 // EOF streambuf.cxx