| /* |
| FUNCTION |
| <<strnlen>>---character string length |
| |
| INDEX |
| strnlen |
| |
| ANSI_SYNOPSIS |
| #include <string.h> |
| size_t strnlen(const char *<[str]>, size_t <[n]>); |
| |
| TRAD_SYNOPSIS |
| #include <string.h> |
| size_t strnlen(<[str]>, <[n]>) |
| char *<[src]>; |
| size_t <[n]>; |
| |
| DESCRIPTION |
| The <<strnlen>> function works out the length of the string |
| starting at <<*<[str]>>> by counting chararacters until it |
| reaches a NUL character or the maximum: <[n]> number of |
| characters have been inspected. |
| |
| RETURNS |
| <<strnlen>> returns the character count or <[n]>. |
| |
| PORTABILITY |
| <<strnlen>> is a GNU extension. |
| |
| <<strnlen>> requires no supporting OS subroutines. |
| |
| */ |
| |
| #undef __STRICT_ANSI__ |
| #include <_ansi.h> |
| #include <string.h> |
| |
| size_t |
| _DEFUN (strnlen, (str, n), |
| _CONST char *str _AND |
| size_t n) |
| { |
| _CONST char *start = str; |
| |
| while (n-- > 0 && *str) |
| str++; |
| |
| return str - start; |
| } |