newlib/libc/string/strpbrk.c

   1 /*
   2 FUNCTION
   3         <<strpbrk>>---find characters in string
   4
   5 INDEX
   6         strpbrk
   7
   8 SYNOPSIS
   9         #include <string.h>
  10         char *strpbrk(const char *<[s1]>, const char *<[s2]>);
  11
  12 DESCRIPTION
  13         This function locates the first occurence in the string
  14         pointed to by <[s1]> of any character in string pointed to by
  15         <[s2]> (excluding the terminating null character).
  16
  17 RETURNS
  18         <<strpbrk>> returns a pointer to the character found in <[s1]>, or a
  19         null pointer if no character from <[s2]> occurs in <[s1]>.
  20
  21 PORTABILITY
  22 <<strpbrk>> requires no supporting OS subroutines.
  23 */
  24
  25 #include <string.h>
  26
  27 char *
  28 strpbrk (const char *s1,
  29         const char *s2)
  30 {
  31   const char *c = s2;
  32
  33   while (*s1)
  34     {
  35       for (c = s2; *c; c++)
  36         {
  37           if (*s1 == *c)
  38             return (char *) s1;
  39         }
  40       s1++;
  41     }
  42
  43   return (char *) NULL;
  44 }