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strspn(3) [bsd man page]

STRSPN(3)						     Library Functions Manual							 STRSPN(3)

NAME
strspn - span a string SYNOPSIS
#include <string.h> size_t strspn(s, charset) char *s; char *charset; DESCRIPTION
The strcspn() function spans the initial part of the null-terminated string s as long as the characters from s occur in string charset . RETURN VALUES
The strspn() function returns the number of characters spanned. SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strstr(3), strtok(3) STANDARDS
The strspn() function conforms to ANSI C X3.159-9189 (``ANSI C''). 4.4 Berkeley Distribution January 12, 1996 STRSPN(3)

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