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1 //=========================================================================== |
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2 // |
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3 // strstr.cxx |
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4 // |
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5 // ANSI standard strstr() 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 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? |
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48 #ifdef CYGPKG_LIBC |
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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 type definitions |
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53 #include <cyg/infra/cyg_trac.h> // Tracing support |
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54 #include <cyg/infra/cyg_ass.h> // Assertion support |
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55 #include <string.h> // Header for this file |
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56 #include <stddef.h> // Compiler definitions such as size_t, NULL etc. |
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57 #include "clibincl/stringsupp.hxx" // Useful string function support and |
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58 // prototypes |
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59 |
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60 // EXPORTED SYMBOLS |
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61 |
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62 externC char * |
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63 strstr( const char *s1, const char *s2 ) CYGPRI_LIBC_WEAK_ALIAS("_strstr"); |
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64 |
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65 // FUNCTIONS |
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66 |
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67 char * |
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68 _strstr( const char *s1, const char *s2 ) |
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69 { |
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70 CYG_REPORT_FUNCNAMETYPE( "_strstr", "returning %08x" ); |
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71 CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 ); |
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72 |
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73 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); |
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74 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); |
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75 |
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76 if (*s1 == '\0') |
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77 { |
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78 if (*s2) |
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79 { |
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80 CYG_REPORT_RETVAL( NULL ); |
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81 return (char *) NULL; |
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82 } // if |
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83 else |
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84 { |
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85 CYG_REPORT_RETVAL( s1 ); |
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86 return (char *) s1; |
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87 } // else |
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88 } // if |
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89 |
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90 while (*s1) |
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91 { |
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92 cyg_ucount32 i; |
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93 |
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94 for (i=0 ; ; i++) |
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95 { |
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96 if (s2[i] == '\0') |
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97 { |
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98 CYG_REPORT_RETVAL( s1 ); |
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99 return (char *) s1; |
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100 } // if |
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101 |
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102 if (s2[i] != s1[i]) |
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103 { |
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104 break; |
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105 } // if |
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106 } // for |
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107 s1++; |
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108 } // while |
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109 |
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110 CYG_REPORT_RETVAL( NULL ); |
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111 |
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112 return (char *) NULL; |
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113 } // _strstr() |
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114 |
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115 #endif // ifdef CYGPKG_LIBC |
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116 |
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117 // EOF strstr.cxx |
