Clib string & memory functions

git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00
parent d5f66e011c
commit 836c97f0ac
162 changed files with 11855 additions and 0 deletions
--- a/watcom/trunk/clib/string/strstr.c
+++ b/watcom/trunk/clib/string/strstr.c
@@ -0,0 +1,113 @@
+/****************************************************************************
+*
+*                            Open Watcom Project
+*
+*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
+*
+*  ========================================================================
+*
+*    This file contains Original Code and/or Modifications of Original
+*    Code as defined in and that are subject to the Sybase Open Watcom
+*    Public License version 1.0 (the 'License'). You may not use this file
+*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
+*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
+*    provided with the Original Code and Modifications, and is also
+*    available at www.sybase.com/developer/opensource.
+*
+*    The Original Code and all software distributed under the License are
+*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
+*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
+*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
+*    NON-INFRINGEMENT. Please see the License for the specific language
+*    governing rights and limitations under the License.
+*
+*  ========================================================================
+*
+* Description:  Implementation of strstr() and wcsstr().
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include "widechar.h"
+#include <stddef.h>
+#include <string.h>
+#if defined(_M_IX86)
+ #include <i86.h>
+#endif
+
+#if defined(M_I86) && !defined( __WIDECHAR__ )
+
+extern  int     i86_memeq( const char *, const char _WCFAR *, int );
+
+#define _ZFLAG          (INTR_ZF<<8)
+
+#if defined(__SMALL_DATA__)
+
+#pragma aux     i86_memeq = \
+        0xf3 0xa6       /* rep cmpsb */\
+        0x9f            /* lahf */\
+        parm caller     [si] [es di] [cx]\
+        value           [ax] \
+        modify exact    [si di cx ax];
+
+#else
+
+#pragma aux     i86_memeq = \
+        0x1e            /* push ds */ \
+        0x8e 0xda       /* mov ds,dx */ \
+        0xf3 0xa6       /* rep cmpsb */\
+        0x9f            /* lahf */\
+        0x1f            /* pop ds */ \
+        parm caller     [dx si] [es di] [cx]\
+        value           [ax] \
+        modify exact    [si di cx ax];
+
+#endif
+
+#define memeq( p1, p2, len )    ( i86_memeq((p1),(p2),(len)) & _ZFLAG )
+
+#else
+
+#define memeq( p1, p2, len )    ( memcmp((p1),(p2),(len)*CHARSIZE) == 0 )
+
+#endif
+
+/* Locate the first occurrence of the string pointed to by s2 in the
+   string pointed to by s1.
+   The strstr function returns a pointer to the located string, or a
+   null pointer if the string is not found.
+*/
+
+
+_WCRTLINK CHAR_TYPE *__F_NAME(strstr,wcsstr) ( const CHAR_TYPE *s1, const CHAR_TYPE *s2 )
+    {
+        CHAR_TYPE *end_of_s1;
+        size_t s1len, s2len;
+
+        if( s2[0] == NULLCHAR ) {
+            return( (CHAR_TYPE *)s1 );
+        } else if( s2[1] == NULLCHAR ) {
+            return( __F_NAME(strchr,wcschr)( s1, s2[0] ) );
+        }
+        #ifdef __WIDECHAR__
+            end_of_s1 = (CHAR_TYPE*)s1 + wcslen( s1 );
+        #else
+            end_of_s1 = memchr( s1, NULLCHAR, ~0u );
+        #endif
+        s2len = __F_NAME(strlen,wcslen)( s2 );
+        for(;;) {
+            s1len = end_of_s1 - s1;
+            if( s1len < s2len ) break;
+            #ifdef __WIDECHAR__
+                s1 = wcschr( s1, *s2 );  /* find start of possible match */
+            #else
+                s1 = memchr( s1, *s2, s1len );  /* find start of possible match */
+            #endif
+            if( s1 == NULL ) break;
+            if( memeq( s1, s2, s2len ) ) return( (CHAR_TYPE *)s1 );
+            ++s1;
+        }
+        return( NULL );
+    }