Mercurial > ecos
annotate packages/language/c/libc/stdio/current/src/common/vsnprintf.cxx @ 208:e0c0827131d1 ecos
Merge from eCos master repository on 2002-05-20-20:11:54-BST
| author | jlarmour |
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| date | Mon, 20 May 2002 22:19:26 +0000 |
| parents | 6ed91473a1cd |
| children | d2c90368aeef |
| rev | line source |
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1 //=========================================================================== |
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2 // |
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3 // vsnprintf.cxx |
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4 // |
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5 // ANSI Stdio vsnprintf() function |
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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 Red Hat, 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 version. |
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16 // |
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 // for more details. |
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21 // |
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22 // You should have received a copy of the GNU General Public License along |
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23 // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 // |
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26 // As a special exception, if other files instantiate templates or use macros |
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27 // or inline functions from this file, or you compile this file and link it |
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28 // with other works to produce a work based on this file, this file does not |
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29 // by itself cause the resulting work to be covered by the GNU General Public |
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30 // License. However the source code for this file must still be made available |
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31 // in accordance with section (3) of the GNU General Public License. |
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32 // |
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33 // This exception does not invalidate any other reasons why a work based on |
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34 // this file might be covered by the GNU General Public License. |
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35 // |
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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37 // at http://sources.redhat.com/ecos/ecos-license |
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38 // ------------------------------------------- |
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39 //####ECOSGPLCOPYRIGHTEND#### |
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40 //=========================================================================== |
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41 //#####DESCRIPTIONBEGIN#### |
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42 // |
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43 // Author(s): jlarmour |
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44 // Contributors: jlarmour |
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45 // Date: 1998-02-13 |
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46 // Purpose: |
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47 // Description: |
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48 // Usage: |
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49 // |
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50 //####DESCRIPTIONEND#### |
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51 // |
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52 //=========================================================================== |
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53 |
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54 // CONFIGURATION |
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55 |
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56 #include <pkgconf/libc_stdio.h> // Configuration header |
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57 |
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58 // INCLUDES |
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59 |
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60 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions |
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61 #include <stddef.h> // NULL and size_t from compiler |
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62 #include <stdio.h> // header for this file |
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63 #include <errno.h> // error codes |
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64 #include <cyg/io/devtab.h> // Device table |
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65 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream |
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66 |
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67 #include <cyg/libc/stdio/io.inl> // I/O system inlines |
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68 |
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69 #ifndef CYGPKG_LIBC_STDIO_FILEIO |
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70 |
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71 // FUNCTIONS |
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72 |
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73 static Cyg_ErrNo |
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74 str_write(cyg_stdio_handle_t handle, const void *buf, cyg_uint32 *len) |
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75 { |
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76 cyg_devtab_entry_t *dev = (cyg_devtab_entry_t *)handle; |
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77 cyg_uint8 **str_p = (cyg_uint8 **)dev->priv; |
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78 cyg_ucount32 i; |
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79 |
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80 // I suspect most strings passed to vsnprintf will be relatively short, |
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81 // so we just take the simple approach rather than have the overhead |
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82 // of calling memcpy etc. |
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83 |
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84 // simply copy string until we run out of user space |
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85 |
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86 for (i = 0; i < *len; i++, (*str_p)++ ) |
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87 { |
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88 **str_p = *((cyg_uint8 *)buf + i); |
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89 } // for |
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90 |
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91 *len = i; |
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92 |
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93 return ENOERR; |
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94 |
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95 } // str_write() |
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96 |
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97 static DEVIO_TABLE(devio_table, |
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98 str_write, // write |
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99 NULL, // read |
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100 NULL, // select |
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101 NULL, // get_config |
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102 NULL); // set_config |
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103 |
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104 externC int |
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105 vsnprintf( char *s, size_t size, const char *format, va_list arg ) |
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106 { |
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107 int rc; |
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108 // construct a fake device with the address of the string we've |
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109 // been passed as its private data. This way we can use the data |
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110 // directly |
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111 DEVTAB_ENTRY_NO_INIT(strdev, |
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112 "strdev", // Name |
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113 NULL, // Dependent name (layered device) |
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114 &devio_table, // I/O function table |
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115 NULL, // Init |
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116 NULL, // Lookup |
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117 &s); // private |
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118 Cyg_StdioStream my_stream( &strdev, Cyg_StdioStream::CYG_STREAM_WRITE, |
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119 false, false, _IONBF, 0, NULL ); |
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120 |
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121 rc = vfnprintf( (FILE *)&my_stream, size, format, arg ); |
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122 |
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123 // Null-terminate it, but note that s has been changed by str_write(), so |
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124 // that it now points to the end of the string |
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125 s[0] = '\0'; |
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126 |
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127 return rc; |
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128 |
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129 } // vsnprintf() |
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130 |
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131 #else |
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132 |
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133 externC int |
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134 vsnprintf( char *s, size_t size, const char *format, va_list arg ) |
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135 { |
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136 int rc; |
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137 |
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138 Cyg_StdioStream my_stream( Cyg_StdioStream::CYG_STREAM_WRITE, |
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139 size, (cyg_uint8 *)s ); |
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140 |
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141 rc = vfnprintf( (FILE *)&my_stream, size, format, arg ); |
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142 |
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143 if( rc > 0 ) |
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144 s[rc] = '\0'; |
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145 |
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146 return rc; |
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147 |
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148 } // vsnprintf() |
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149 |
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150 #endif |
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151 |
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152 // EOF vsnprintf.cxx |
