strcspn(3) -- Linux man page
NAME
strspn, strcspn - search a string for a set of characters
SYNOPSIS
#include <string.h>
size_t strspn(const char *s, const char *accept);
size_t strcspn(const char *s, const char *reject);
DESCRIPTION
The strspn() function calculates the length of the initial
segment of s which consists entirely of characters in
accept.
The strcspn() function calculates the length of the initial
segment of s which consists entirely of characters not in
reject.
RETURN VALUE
The strspn() function returns the number of characters in
the initial segment of s which consist only of characters
from accept.
The strcspn() function returns the number of characters in
the initial segment of s which are not in the string
reject.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
index(3),
memchr(3),
rindex(3),
strchr(3),
strpbrk(3),
strsep(3),
strstr(3),
strtok(3)
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