Annotation of sys/lib/libkern/strncpy.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: strncpy.c,v 1.7 2004/11/28 07:23:41 mickey 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: #if defined(LIBC_SCCS) && !defined(lint)
! 36: static char *rcsid = "$OpenBSD: strncpy.c,v 1.7 2004/11/28 07:23:41 mickey Exp $";
! 37: #endif /* LIBC_SCCS and not lint */
! 38:
! 39: #if !defined(_KERNEL) && !defined(_STANDALONE)
! 40: #include <string.h>
! 41: #else
! 42: #include <lib/libkern/libkern.h>
! 43: #endif
! 44:
! 45: /*
! 46: * Copy src to dst, truncating or null-padding to always copy n bytes.
! 47: * Return dst.
! 48: */
! 49: char *
! 50: strncpy(char *dst, const char *src, size_t n)
! 51: {
! 52: if (n != 0) {
! 53: char *d = dst;
! 54: const char *s = src;
! 55:
! 56: do {
! 57: if ((*d++ = *s++) == 0) {
! 58: /* NUL pad the remaining n-1 bytes */
! 59: while (--n != 0)
! 60: *d++ = 0;
! 61: break;
! 62: }
! 63: } while (--n != 0);
! 64: }
! 65: return (dst);
! 66: }
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