NAME
strspn, strcspn
— span a string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include
<string.h>
size_t
strspn(const
char *s, const char
*charset);
size_t
strcspn(const
char *s, const char
*charset);
DESCRIPTION
The
strspn()
function spans the initial part of the null-terminated string
s as long as the characters from
s occur in the null-terminated string
charset. In other words, it computes the string array
index of the first character of s which is not in
charset, else the index of the first null
character.
The
strcspn()
function spans the initial part of the null-terminated string
s as long as the characters from
s
do not occur
in the null-terminated string charset (it spans the
complement
of charset). In other words, it computes the string
array index of the first character of s which is also
in charset, else the index of the first null
character.
RETURN VALUES
The strspn() and
strcspn() functions return the number of characters
spanned.
SEE ALSO
memchr(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strstr(3), strtok(3), wcsspn(3)
STANDARDS
The strspn() and
strcspn() functions conform to
ISO/IEC 9899:1990
(“ISO C90”).