Mercurial > flash_v2
diff packages/language/c/libc/current/src/string/strstr.cxx @ 0:3111d98ba7b3 ecos-v1_1-release
Initial commit of eCos version 1.1
| author | jlarmour |
|---|---|
| date | Tue, 11 May 1999 11:16:07 +0000 |
| parents | |
| children | 443894e2e912 |
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new file mode 100644 --- /dev/null +++ b/packages/language/c/libc/current/src/string/strstr.cxx @@ -0,0 +1,117 @@ +//=========================================================================== +// +// strstr.cxx +// +// ANSI standard strstr() routine +// +//=========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Cygnus eCos Public License +// Version 1.0 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://sourceware.cygnus.com/ecos +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Cygnus Operating System, released +// September 30, 1998. +// +// The Initial Developer of the Original Code is Cygnus. Portions created +// by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//=========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): jlarmour +// Contributors: jlarmour@cygnus.co.uk +// Date: 1998-02-13 +// Purpose: +// Description: +// Usage: +// +//####DESCRIPTIONEND#### +// +//=========================================================================== + +// CONFIGURATION + +#include <pkgconf/libc.h> // Configuration header + +// Include the C library? +#ifdef CYGPKG_LIBC + +// INCLUDES + +#include <cyg/infra/cyg_type.h> // Common type definitions +#include <cyg/infra/cyg_trac.h> // Tracing support +#include <cyg/infra/cyg_ass.h> // Assertion support +#include <string.h> // Header for this file +#include <stddef.h> // Compiler definitions such as size_t, NULL etc. +#include "clibincl/stringsupp.hxx" // Useful string function support and + // prototypes + +// EXPORTED SYMBOLS + +externC char * +strstr( const char *s1, const char *s2 ) CYGPRI_LIBC_WEAK_ALIAS("_strstr"); + +// FUNCTIONS + +char * +_strstr( const char *s1, const char *s2 ) +{ + CYG_REPORT_FUNCNAMETYPE( "_strstr", "returning %08x" ); + CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 ); + + CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); + CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); + + if (*s1 == '\0') + { + if (*s2) + { + CYG_REPORT_RETVAL( NULL ); + return (char *) NULL; + } // if + else + { + CYG_REPORT_RETVAL( s1 ); + return (char *) s1; + } // else + } // if + + while (*s1) + { + cyg_ucount32 i; + + for (i=0 ; ; i++) + { + if (s2[i] == '\0') + { + CYG_REPORT_RETVAL( s1 ); + return (char *) s1; + } // if + + if (s2[i] != s1[i]) + { + break; + } // if + } // for + s1++; + } // while + + CYG_REPORT_RETVAL( NULL ); + + return (char *) NULL; +} // _strstr() + +#endif // ifdef CYGPKG_LIBC + +// EOF strstr.cxx
