| // SPDX-License-Identifier: BSD-3-Clause |
| /* |
| * Copyright (c) 1994-2009 Red Hat, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * 3. Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /* |
| 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; |
| } |