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glibc  2.9
strspn.c
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00001 /* Copyright (C) 1991, 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 
00021 #undef strspn
00022 
00023 /* Return the length of the maximum initial segment
00024    of S which contains only characters in ACCEPT.  */
00025 size_t
00026 strspn (s, accept)
00027      const char *s;
00028      const char *accept;
00029 {
00030   const char *p;
00031   const char *a;
00032   size_t count = 0;
00033 
00034   for (p = s; *p != '\0'; ++p)
00035     {
00036       for (a = accept; *a != '\0'; ++a)
00037        if (*p == *a)
00038          break;
00039       if (*a == '\0')
00040        return count;
00041       else
00042        ++count;
00043     }
00044 
00045   return count;
00046 }
00047 libc_hidden_builtin_def (strspn)