kolibrios-fun/programs/develop/libraries/kolibri-libc/source/string/strspn.c

/* strspn( const char *, const char * )

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <string.h>

size_t strspn( const char * s1, const char * s2 )
{
    size_t len = 0;
    const char * p;

    while ( s1[ len ] )
    {
        p = s2;

        while ( *p )
        {
            if ( s1[len] == *p )
            {
                break;
            }

            ++p;
        }

        if ( ! *p )
        {
            return len;
        }

        ++len;
    }

    return len;
}