size_t strspn(const char *s, const char *accept);
size_t strcspn(const char *s, const char *reject);
The strspn() function calculates the length (in bytes) of the initial
segment of s which consists entirely of bytes in accept.
The strcspn() function calculates the length of the initial segment of
s which consists entirely of bytes not in reject.
The strspn() function returns the number of bytes in the initial seg-
ment of s which consist only of bytes from accept.
The strcspn() function returns the number of bytes in the initial seg-
ment of s which are not in the string reject.
SVr4, 4.3BSD, C89, C99.
index(3), memchr(3), rindex(3), strchr(3), string(3), strpbrk(3),
strsep(3), strstr(3), strtok(3), wcscspn(3), wcsspn(3)
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