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glibc  2.9
strcmp.c
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00001 /* Copyright (C) 1991, 1996, 1997, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <string.h>
00020 #include <memcopy.h>
00021 
00022 #undef strcmp
00023 
00024 /* Compare S1 and S2, returning less than, equal to or
00025    greater than zero if S1 is lexicographically less than,
00026    equal to or greater than S2.  */
00027 int
00028 strcmp (p1, p2)
00029      const char *p1;
00030      const char *p2;
00031 {
00032   register const unsigned char *s1 = (const unsigned char *) p1;
00033   register const unsigned char *s2 = (const unsigned char *) p2;
00034   unsigned reg_char c1, c2;
00035 
00036   do
00037     {
00038       c1 = (unsigned char) *s1++;
00039       c2 = (unsigned char) *s2++;
00040       if (c1 == '\0')
00041        return c1 - c2;
00042     }
00043   while (c1 == c2);
00044 
00045   return c1 - c2;
00046 }
00047 libc_hidden_builtin_def (strcmp)