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annotate packages/language/c/libc/current/src/string/strlen.cxx @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 443894e2e912
children bf00f99aec69
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1 //===========================================================================
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2 //
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3 // strlen.cxx
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4 //
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5 // ANSI standard strlen() routine
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6 //
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7 //===========================================================================
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8 //####COPYRIGHTBEGIN####
64
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat 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
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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 Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
0
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
2
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35 // Contributors: jlarmour
0
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36 // Date: 1998-02-13
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc.h> // Configuration header
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48
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49 // Include the C library?
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50 #ifdef CYGPKG_LIBC
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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 type definitions
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55 #include <cyg/infra/cyg_trac.h> // Tracing support
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56 #include <cyg/infra/cyg_ass.h> // Assertion support
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57 #include <string.h> // Header for this file
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58 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
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59 #include "clibincl/stringsupp.hxx" // Useful string function support and
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60 // prototypes
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61
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62 // EXPORTED SYMBOLS
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63
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64 externC size_t
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65 strlen( const char *s ) CYGPRI_LIBC_WEAK_ALIAS("_strlen");
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66
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67 // FUNCTIONS
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68
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69 size_t
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70 _strlen( const char *s )
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71 {
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72 int retval;
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73
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74 CYG_REPORT_FUNCNAMETYPE( "_strlen", "returning length %d" );
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75 CYG_REPORT_FUNCARG1( "s=%08x", s );
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76
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77 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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78
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79 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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80 const char *start = s;
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81
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82 while (*s)
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83 s++;
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84
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85 retval = s - start;
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86
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87 CYG_REPORT_RETVAL( retval );
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88
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89 return retval;
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90
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91 #else
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92
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93 const char *start = s;
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94 CYG_WORD *aligned_addr;
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95
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96 if (CYG_LIBC_STR_UNALIGNED (s))
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97 {
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98 while (*s)
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99 s++;
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100 retval = s - start;
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101
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102 CYG_REPORT_RETVAL( retval );
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103
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104 return retval;
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105 }
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106
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107 // If the string is word-aligned, we can check for the presence of
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108 // a null in each word-sized block.
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109
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110 aligned_addr = (CYG_WORD *)s;
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111 while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr))
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112 aligned_addr++;
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113
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114 // Once a null is detected, we check each byte in that block for a
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115 // precise position of the null.
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116 s = (char*)aligned_addr;
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117 while (*s)
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118 s++;
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119 retval = s - start;
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120
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121 CYG_REPORT_RETVAL( retval );
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122
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123 return retval;
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124 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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125 // defined(__OPTIMIZE_SIZE__)
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126 } // _strlen()
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127
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128 #endif // ifdef CYGPKG_LIBC
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129
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130 // EOF strlen.cxx