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STRSPN(3) Library Functions Manual STRSPN(3)

strspn — span a string

#include <string.h>

size_t
strspn(const char *s, const char *charset);

The () function spans the initial part of the null-terminated string s as long as the characters from s occur in string charset.

The strspn() function returns the number of characters spanned.

index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strstr(3), strtok(3)

The strspn() function conforms to ANSI X3.159-1989 (“ANSI C89”).

4.4BSD-Lite2 June 4, 1993 STRSPN(3)