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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 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //=========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998-02-13 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //=========================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Include the C library? And do we want the stdio stuff? And buffered I/O? |
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48 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) && \ |
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49 defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO) |
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50 |
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51 |
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52 // INCLUDES |
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53 |
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54 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions |
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55 #include <cyg/infra/cyg_ass.h> // Assertion support |
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56 #include <errno.h> // Cyg_ErrNo |
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57 #include "clibincl/stdlibsupp.hxx"// _malloc() and _free() |
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58 #include "clibincl/streambuf.hxx" // header for this file, just in case |
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59 |
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60 // FUNCTIONS |
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61 |
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62 Cyg_ErrNo |
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63 Cyg_StdioStreamBuffer::set_buffer( cyg_ucount32 size=BUFSIZE, |
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64 cyg_uint8 *new_buffer=NULL ) |
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65 { |
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66 |
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67 #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF |
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68 |
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69 // user-supplied buffer? |
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70 if (new_buffer != NULL) { |
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71 CYG_CHECK_DATA_PTR(new_buffer, "new_buffer not valid"); |
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72 // first check if we were responsible for the old buffer |
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73 if (call_free) { |
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74 _free(buffer_bottom); |
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75 call_free = false; |
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76 } |
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77 buffer_bottom = new_buffer; |
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78 } |
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79 else if ( size != get_buffer_size() ) { // as long as its different from |
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80 // what we've got now |
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81 cyg_uint8 *malloced_buf; |
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82 |
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83 malloced_buf = (cyg_uint8 * )_malloc( size ); |
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84 if (malloced_buf == NULL) |
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85 return ENOMEM; |
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86 |
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87 // should the old buffer be freed? This waits till after we know |
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88 // whether the malloc succeeded |
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89 if (call_free) |
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90 _free( buffer_bottom ); |
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91 |
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92 buffer_bottom = malloced_buf; |
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93 |
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94 call_free=true; |
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95 |
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96 } // else if |
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97 |
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98 |
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99 #else // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF |
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100 |
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101 // In this config we can't use a different buffer, or set a |
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102 // size greater than now. We can pretend to shrink it though |
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103 |
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104 // Note on the next line we compare it with the size of buffer_bottom |
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105 // and not the current size, as that's what is the limiting factor |
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106 if ( (new_buffer != NULL) || (size > sizeof(buffer_bottom)) ) |
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107 return EINVAL; |
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108 |
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109 #endif // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF |
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110 |
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111 buffer_top = current_buffer_position = &buffer_bottom[0]; |
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112 buffer_size = size; |
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113 |
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114 return ENOERR; |
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115 |
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116 } // set_buffer() |
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117 |
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118 |
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119 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) && |
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120 // defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO) |
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121 |
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122 |
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123 // EOF streambuf.cxx |
