strcspn - span the complement of a string
#include <string.h>
size_t
strcspn(const char *s, const char *charset);
The strcspn() function spans the initial part of the nullterminated
string s as long as the characters from s do not occur in
string charset
(it spans the complement of charset).
The strcspn() function returns the number of characters
spanned.
The following call to strcspn() will return 3, since the
first three
characters of string s do not occur in string charset:
char *s = "foobar";
char *charset = "bar";
size_t span;
span = strcspn(s, charset);
memchr(3), strchr(3), strpbrk(3), strrchr(3), strsep(3),
strspn(3),
strstr(3), strtok(3)
The strcspn() function conforms to ANSI X3.159-1989 (``ANSI
C'').
OpenBSD 3.6 June 29, 1991
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