@node strlen, string
@findex strlen
@subheading Syntax

@example
#include <string.h>

size_t strlen(const char *string);
@end example

@subheading Description

This function returns the number of characters in @var{string}.

@subheading Return Value

The length of the string.

@subheading Portability

@portability ansi, posix

@subheading Example

@example
if (strlen(fname) > PATH_MAX)
  invalid_file(fname);
@end example