strpbrk.c

来自「the vxworks system kernel souce packeg.t」· C语言 代码 · 共 66 行

/* strpbrk.c - string search, string */

/* Copyright 1992-1993 Wind River Systems, Inc. */

/*
modification history
--------------------
01c,25feb93,jdi  documentation cleanup for 5.1.
01b,20sep92,smb  documentation additions
01a,08jul92,smb  written and documented.
*/

/*
DESCRIPTION

INCLUDE FILES: string.h

SEE ALSO: American National Standard X3.159-1989

NOMANUAL
*/

#include "vxWorks.h"
#include "string.h"


/*******************************************************************************
*
* strpbrk - find the first occurrence in a string of a character from a given set (ANSI)
*
* This routine locates the first occurrence in string <s1> of any character
* from string <s2>.
*
* INCLUDE FILES: string.h
*
* RETURNS:
* A pointer to the character found in <s1>, or
* NULL if no character from <s2> occurs in <s1>.
*
* SEE ALSO: strcspn()
*/

char * strpbrk
    (
    const char * s1,       /* string to search */
    const char * s2        /* set of characters to look for in <s1> */
    )
    {
    char *scanp;
    int   c;
    int   sc;

    while ((c = *s1++) != 0)			/* wait until end of string */
	{
	/* loop, searching for character */

	for (scanp = CHAR_FROM_CONST(s2); (sc = *scanp++) != 0;)
	    {
	    if (sc == c)
		return (CHAR_FROM_CONST(s1 - 1));
	    }
	}

    return (NULL);
    }