strncpy.c

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    1 /*      $OpenBSD: strncpy.c,v 1.9 2014/06/10 04:16:57 deraadt Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Chris Torek.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <lib/libkern/libkern.h>
   36 
   37 /*
   38  * Copy src to dst, truncating or null-padding to always copy n bytes.
   39  * Return dst.
   40  */
   41 char *
   42 strncpy(char *dst, const char *src, size_t n)
   43 {
   44         if (n != 0) {
   45                 char *d = dst;
   46                 const char *s = src;
   47 
   48                 do {
   49                         if ((*d++ = *s++) == 0) {
   50                                 /* NUL pad the remaining n-1 bytes */
   51                                 while (--n != 0)
   52                                         *d++ = 0;
   53                                 break;
   54                         }
   55                 } while (--n != 0);
   56         }
   57         return (dst);
   58 }

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/strncpy.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/strncpy.c