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annotate packages/language/c/libc/stdio/current/src/common/vsnprintf.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 5e8c9e64b5b0
children
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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, 2009 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: jlarmour
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44 // Date: 1998-02-13
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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 // INCLUDES
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58
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59 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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60 #include <stddef.h> // NULL and size_t from compiler
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61 #include <stdio.h> // header for this file
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62 #include <errno.h> // error codes
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63 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
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64
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65 #include <cyg/libc/stdio/io.inl> // I/O system inlines
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66
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67 // FUNCTIONS
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68
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69 class Cyg_VsnprintfStream: public Cyg_OutputStream
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70 {
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71 public:
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72 Cyg_VsnprintfStream(char* s): s_(s) {}
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73
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74 virtual Cyg_ErrNo write( const cyg_uint8 *buffer,
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75 cyg_ucount32 buffer_length, cyg_ucount32 *bytes_written );
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76
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77 virtual Cyg_ErrNo get_error( void ) { return ENOERR; }
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78
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79 private:
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80 char* s_;
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81 };
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82
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83 Cyg_ErrNo
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84 Cyg_VsnprintfStream::write(
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85 const cyg_uint8 *buffer,
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86 cyg_ucount32 buffer_length,
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87 cyg_ucount32 *bytes_written )
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88 {
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89 #ifdef WHEN_MEMCPY_OPTIMISED_IN_ECOS_EVENTUALLY
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90 memcpy(s_, buffer, buffer_length);
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91 s_ += buffer_length;
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92 *bytes_written = buffer_length;
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93 #else
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94 char *dest = s_;
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95 char const *src = (char const *)buffer;
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96 char const *end = src + buffer_length;
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97 while(src < end)
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98 *dest++ = *src++;
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99 s_ = dest;
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100 *bytes_written = buffer_length;
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101 #endif
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102 return ENOERR;
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103 }
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104
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105 externC int
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106 vsnprintf( char *s, size_t size, const char *format, va_list arg ) __THROW
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107 {
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108 int ret;
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109 Cyg_VsnprintfStream stream(s);
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110 ret = vfnprintf( (FILE *)(void *)&stream, size, format, arg );
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111 /* If no error, and string not truncated, then apply null termination in
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112 * correct place
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113 */
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114 if ( (ret >= 0) && ((size_t)ret < size) )
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115 s[ret] = '\0';
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116 #ifdef CYGIMP_LIBC_STDIO_C99_SNPRINTF
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117 /* C99 case. If no error, and string truncated, apply null termination
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118 * in correct place
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119 */
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120 if ( (ret >= 0) && ((size_t)ret >= size) && (size > 0) )
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121 s[size-1] = '\0';
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122 #endif
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123 return ret;
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124 } // vsnprintf()
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125
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126 // EOF vsnprintf.cxx