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STRCSPN(3) FreeBSD Library Functions Manual STRCSPN(3) NAME strcspn - span the complement of a string SYNOPSIS #include <string.h> size_t strcspn(const char *s, const char *charset); DESCRIPTION The strcspn() function spans the initial part of the NUL-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. EXAMPLES 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); The following removes the first (if any) newline character from string line. This is useful for trimming the newline after a fgets(3) call. char line[BUFSIZ]; if (fgets(line, sizeof(line), fp) != NULL) line[strcspn(line, "\n")] = '\0'; SEE ALSO memchr(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), wcscspn(3) STANDARDS The strcspn() function conforms to ANSI X3.159-1989 ("ANSI C89"). HISTORY The strcspn() function first appeared in AT&T System III UNIX and was reimplemented for 4.3BSD. FreeBSD 14.1-RELEASE-p8 December 11, 2024 FreeBSD 14.1-RELEASE-p8