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strcspn(3) [bsd man page]

STRCSPN(3)						     Library Functions Manual							STRCSPN(3)

NAME
strcspn - span the complement of a string SYNOPSIS
#include <string.h> size_t strcspn(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 do not occur in string charset (it spans the complement of charset ) . RETURN VALUES
The strcspn() function returns the number of characters spanned. SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3) STANDARDS
The strcspn() function conforms to ANSI C X3.159-1989 (``ANSI C''). 4.4 Berkeley Distribution January 12, 1996 STRCSPN(3)

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