1 /*

     2 * Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 * FUNCTION

    16 * <<strspn>>---find initial match

    17 * INDEX

    18 * strspn

    19 * ANSI_SYNOPSIS

    20 * #include <string.h>

    21 * size_t strspn(const char *<[s1]>, const char *<[s2]>);

    22 * TRAD_SYNOPSIS

    23 * #include <string.h>

    24 * size_t strspn(<[s1]>, <[s2]>)

    25 * char *<[s1]>;

    26 * char *<[s2]>;

    27 * This function computes the length of the initial segment of

    28 * the string pointed to by <[s1]> which consists entirely of

    29 * characters from the string pointed to by <[s2]> (excluding the

    30 * terminating null character).

    31 * RETURNS

    32 * <<strspn>> returns the length of the segment found.

    33 * PORTABILITY

    34 * <<strspn>> is ANSI C.

    35 * <<strspn>> requires no supporting OS subroutines.

    36 * QUICKREF

    37 * strspn ansi pure

    38 * 

    39 *

    40 */

    41 

    42 

    43 

    44 #include <string.h>

    45 

    46 /**

    47 Get length of substring composed of given characters.

    48 Scans s1 character by character, returning the number of characters read before 

    49 the first character not included in s2 is found.

    50 The search does not include terminating null-characters.

    51 @return the length of the initial substring of s1 

    52 that is only composed of characters included in s2.

    53 @param s1 Null-terminated string to be scanned. 

    54 @param s2 Null-terminated string containing character set.

    55 */

    56 EXPORT_C size_t

    57 strspn (const char *s1, const char *s2)

    58 {

    59   const char *s = s1;

    60   const char *c;

    61 

    62   while (*s1)

    63     {

    64       for (c = s2; *c; c++)

    65 	{

    66 	  if (*s1 == *c)

    67 	    break;

    68 	}

    69       if (*c == '\0')

    70 	break;

    71       s1++;

    72     }

    73 

    74   return s1 - s;

    75 }