1281135Spfg/* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */ 249593Simp 349593Simp/* 4281135Spfg * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com> 549593Simp * 6184059Sdelphij * Permission to use, copy, modify, and distribute this software for any 7184059Sdelphij * purpose with or without fee is hereby granted, provided that the above 8184059Sdelphij * copyright notice and this permission notice appear in all copies. 949593Simp * 10184059Sdelphij * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11184059Sdelphij * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12184059Sdelphij * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13184059Sdelphij * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14184059Sdelphij * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15184059Sdelphij * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16184059Sdelphij * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1749593Simp */ 1849593Simp 1986170Sobrien#include <sys/cdefs.h> 2086170Sobrien__FBSDID("$FreeBSD$"); 2149593Simp 2249593Simp#include <sys/types.h> 2349593Simp#include <string.h> 2449593Simp 2549593Simp/* 26281135Spfg * Copy string src to buffer dst of size dsize. At most dsize-1 27281135Spfg * chars will be copied. Always NUL terminates (unless dsize == 0). 28281135Spfg * Returns strlen(src); if retval >= dsize, truncation occurred. 2949593Simp */ 30159644Smaximsize_t 31281135Spfgstrlcpy(char * __restrict dst, const char * __restrict src, size_t dsize) 3249593Simp{ 33281135Spfg const char *osrc = src; 34281135Spfg size_t nleft = dsize; 3549593Simp 36281135Spfg /* Copy as many bytes as will fit. */ 37281135Spfg if (nleft != 0) { 38281135Spfg while (--nleft != 0) { 39281135Spfg if ((*dst++ = *src++) == '\0') 4049594Simp break; 41184059Sdelphij } 4249593Simp } 4349593Simp 44281135Spfg /* Not enough room in dst, add NUL and traverse rest of src. */ 45281135Spfg if (nleft == 0) { 46281135Spfg if (dsize != 0) 47281135Spfg *dst = '\0'; /* NUL-terminate dst */ 48281135Spfg while (*src++) 4949594Simp ; 5049594Simp } 5149594Simp 52281135Spfg return(src - osrc - 1); /* count does not include NUL */ 5349593Simp} 54