53 lines
818 B
C
53 lines
818 B
C
/*
|
|
FUNCTION
|
|
<<strspn>>---find initial match
|
|
|
|
INDEX
|
|
strspn
|
|
|
|
SYNOPSIS
|
|
#include <string.h>
|
|
size_t strspn(const char *<[s1]>, const char *<[s2]>);
|
|
|
|
DESCRIPTION
|
|
This function computes the length of the initial segment of
|
|
the string pointed to by <[s1]> which consists entirely of
|
|
characters from the string pointed to by <[s2]> (excluding the
|
|
terminating null character).
|
|
|
|
RETURNS
|
|
<<strspn>> returns the length of the segment found.
|
|
|
|
PORTABILITY
|
|
<<strspn>> is ANSI C.
|
|
|
|
<<strspn>> requires no supporting OS subroutines.
|
|
|
|
QUICKREF
|
|
strspn ansi pure
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
size_t
|
|
strspn (const char *s1,
|
|
const char *s2)
|
|
{
|
|
const char *s = s1;
|
|
const char *c;
|
|
|
|
while (*s1)
|
|
{
|
|
for (c = s2; *c; c++)
|
|
{
|
|
if (*s1 == *c)
|
|
break;
|
|
}
|
|
if (*c == '\0')
|
|
break;
|
|
s1++;
|
|
}
|
|
|
|
return s1 - s;
|
|
}
|