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annotate packages/language/c/libc/string/current/src/strchr.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 //===========================================================================
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2 //
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3 // strchr.cxx
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4 //
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5 // ANSI standard strchr() routine
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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 Red Hat eCos Public License
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12 // Version 1.1 (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://www.redhat.com/
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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 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 //
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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
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35 // Contributors:
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36 // Date: 2000-04-14
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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_string.h> // Configuration header
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48
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49 // INCLUDES
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50
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51 #include <cyg/infra/cyg_type.h> // Common type definitions
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52 #include <cyg/infra/cyg_trac.h> // Tracing support
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53 #include <cyg/infra/cyg_ass.h> // Assertion support
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54 #include <string.h> // Header for this file
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55 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
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56 #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
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57 // prototypes
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58
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59 // EXPORTED SYMBOLS
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60
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61 externC char *
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62 strchr( const char *s, int c ) CYGBLD_ATTRIB_WEAK_ALIAS(__strchr);
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63
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64 // MACROS
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65
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66 // DETECTCHAR returns nonzero if X contains the byte used
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67 // to fill MASK.
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68 #define DETECTCHAR(X,MASK) (CYG_LIBC_STR_DETECTNULL( (X) ^ (MASK) ))
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69
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70 // FUNCTIONS
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71
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72 char *
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73 __strchr( const char *s, int c )
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74 {
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75 CYG_REPORT_FUNCNAMETYPE( "__strchr", "returning %08x" );
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76 CYG_REPORT_FUNCARG2( "s=%08x, c=%d", s, c );
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77
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78 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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79
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80 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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81 char charc = c;
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82
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83 while (*s && *s != charc)
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84 {
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85 s++;
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86 }
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87
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88 if (*s != charc)
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89 {
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90 s = NULL;
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91 }
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92
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93 CYG_REPORT_RETVAL( s );
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94
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95 return (char *) s;
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96 #else
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97 char charc = c;
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98 CYG_WORD mask;
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99 CYG_WORD j;
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100 CYG_WORD *aligned_addr;
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101
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102 if (CYG_LIBC_STR_UNALIGNED (s))
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103 {
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104 while (*s && *s != charc)
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105 s++;
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106 if (*s != charc)
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107 s = NULL;
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108
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109 CYG_REPORT_RETVAL( s );
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110
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111 return (char *) s;
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112 }
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113
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114 for (j = 0, mask = 0; j < sizeof(mask); j++)
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115 mask = (mask << 8) + charc;
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116
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117 aligned_addr = (CYG_WORD *)s;
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118 while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr) &&
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119 !DETECTCHAR (*aligned_addr, mask))
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120 aligned_addr++;
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121
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122 // The block of bytes currently pointed to by aligned_addr
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123 // contains either a null or the target char, or both. We
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124 // catch it using the bytewise search.
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125
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126 s = (char *)aligned_addr;
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127 while (*s && *s != charc)
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128 s++;
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129 if (*s != charc)
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130 s = NULL;
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131
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132 CYG_REPORT_RETVAL( s );
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133
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134 return (char *)s;
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135 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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136 // defined(__OPTIMIZE_SIZE__)
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137 } // __strchr()
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138
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139 // EOF strchr.cxx