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Annotation of GNUtools/libg++/libiberty/strstr.c, revision 1.1

1.1     ! root        1: /* Simple implementation of strstr for systems without it.
        !             2:    Copyright (C) 1991 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of the libiberty library.
        !             5: Libiberty is free software; you can redistribute it and/or
        !             6: modify it under the terms of the GNU Library General Public
        !             7: License as published by the Free Software Foundation; either
        !             8: version 2 of the License, or (at your option) any later version.
        !             9: 
        !            10: Libiberty is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            13: Library General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU Library General Public
        !            16: License along with libiberty; see the file COPYING.LIB.  If
        !            17: not, write to the Free Software Foundation, Inc., 675 Mass Ave,
        !            18: Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: /*
        !            21: 
        !            22: NAME
        !            23: 
        !            24:        strstr -- locate first occurance of a substring
        !            25: 
        !            26: SYNOPSIS
        !            27: 
        !            28:        #include <string.h>
        !            29: 
        !            30:        char *strstr (char *s1, char *s2)
        !            31: 
        !            32: DESCRIPTION
        !            33: 
        !            34:        Locates the first occurance in the string pointed to by S1 of
        !            35:        the string pointed to by S2.  Returns a pointer to the substring
        !            36:        found, or a NULL pointer if not found.  If S2 points to a string
        !            37:        with zero length, the function returns S1.
        !            38:        
        !            39: BUGS
        !            40: 
        !            41: */
        !            42: 
        !            43: 
        !            44: /* FIXME:  The above description is ANSI compiliant.  This routine has not
        !            45:    been validated to comply with it.  -fnf */
        !            46: 
        !            47: char *
        !            48: strstr (s1, s2)
        !            49:   char *s1, *s2;
        !            50: {
        !            51:   register char *p = s1;
        !            52:   extern char *strchr ();
        !            53:   extern int strncmp ();
        !            54: #if __GNUC__==2
        !            55:   extern __SIZE_TYPE__ strlen ();
        !            56: #endif
        !            57:   register int len = strlen (s2);
        !            58: 
        !            59:   for (; (p = strchr (p, *s2)) != 0; p++)
        !            60:     {
        !            61:       if (strncmp (p, s2, len) == 0)
        !            62:        {
        !            63:          return (p);
        !            64:        }
        !            65:     }
        !            66:   return (0);
        !            67: }

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