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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 //####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? |
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48 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions |
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53 #include <stddef.h> // NULL and size_t from compiler |
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54 #include <stdio.h> // header for this file |
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55 #include <errno.h> // error codes |
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56 #include <cyg/devs/common/table.h> // Device table stuff |
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57 #include <cyg/devs/common/iorb.h> // IORBs |
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58 #include "clibincl/stdiosupp.hxx" // Support functions for stdio |
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59 #include "clibincl/stream.hxx" // Cyg_StdioStream |
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60 |
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61 |
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62 // EXPORTED SYMBOLS |
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63 |
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64 externC int |
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65 vsnprintf( char *, size_t, const char *, va_list ) |
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66 CYGPRI_LIBC_WEAK_ALIAS("_vsnprintf"); |
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67 |
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68 // FUNCTIONS |
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69 |
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70 |
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71 static Cyg_ErrNo |
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72 str_write( CYG_ADDRWORD cookie, Cyg_IORB *iorb ) |
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73 { |
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74 cyg_uint8 **str_p = (cyg_uint8 **) cookie; |
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75 cyg_ucount32 i=0; |
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76 |
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77 // I suspect most strings passed to vsnprintf will be relatively short, |
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78 // so we just take the simple approach rather than have the overhead |
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79 // of calling memcpy etc. |
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80 |
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81 // simply copy string until we run out of user space |
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82 |
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83 for (i=0; i < iorb->buffer_length; i++, (*str_p)++ ) |
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84 { |
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85 **str_p = *((char *)iorb->buffer + i); |
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86 } // for |
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87 |
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88 iorb->xferred_length = i; |
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89 |
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90 return ENOERR; |
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91 |
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92 } // str_write() |
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93 |
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94 |
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95 externC int |
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96 _vsnprintf( char *s, size_t size, const char *format, va_list arg ) |
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97 { |
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98 int rc; |
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99 // construct a fake device with the address of the string we've |
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100 // been passed as its private data. This way we can use the data |
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101 // directly |
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102 struct Cyg_Device_Table_t strdev = { "strdev", |
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103 (CYG_ADDRWORD) &s, |
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104 NULL, // open |
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105 NULL, // read_cancel |
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106 NULL, // write_cancel |
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107 NULL, // read_blocking |
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108 &str_write, // write_blocking |
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109 NULL, // read_asynchronous |
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110 NULL, // write_asynchronous |
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111 NULL, // close |
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112 0 }; // ioctl |
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113 Cyg_StdioStream my_stream( &strdev, Cyg_StdioStream::CYG_STREAM_WRITE, |
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114 false, false, _IONBF, 0, NULL ); |
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115 |
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116 rc = _vfnprintf( (FILE *)&my_stream, size, format, arg ); |
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117 |
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118 // Null-terminate it, but note that s has been changed by str_write(), so |
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119 // that it now points to the end of the string |
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120 s[0] = '\0'; |
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121 |
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122 return rc; |
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123 |
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124 } // _vsnprintf() |
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125 |
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126 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) |
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127 |
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128 // EOF vsnprintf.cxx |
