1*4a5d661aSToomas Soome /* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */ 2*4a5d661aSToomas Soome 3*4a5d661aSToomas Soome /* 4*4a5d661aSToomas Soome * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com> 5*4a5d661aSToomas Soome * 6*4a5d661aSToomas Soome * Permission to use, copy, modify, and distribute this software for any 7*4a5d661aSToomas Soome * purpose with or without fee is hereby granted, provided that the above 8*4a5d661aSToomas Soome * copyright notice and this permission notice appear in all copies. 9*4a5d661aSToomas Soome * 10*4a5d661aSToomas Soome * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11*4a5d661aSToomas Soome * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12*4a5d661aSToomas Soome * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13*4a5d661aSToomas Soome * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14*4a5d661aSToomas Soome * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15*4a5d661aSToomas Soome * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16*4a5d661aSToomas Soome * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17*4a5d661aSToomas Soome */ 18*4a5d661aSToomas Soome 19*4a5d661aSToomas Soome #include <sys/cdefs.h> 20*4a5d661aSToomas Soome __FBSDID("$FreeBSD$"); 21*4a5d661aSToomas Soome 22*4a5d661aSToomas Soome #include <sys/types.h> 23*4a5d661aSToomas Soome #include <string.h> 24*4a5d661aSToomas Soome 25*4a5d661aSToomas Soome /* 26*4a5d661aSToomas Soome * Copy string src to buffer dst of size dsize. At most dsize-1 27*4a5d661aSToomas Soome * chars will be copied. Always NUL terminates (unless dsize == 0). 28*4a5d661aSToomas Soome * Returns strlen(src); if retval >= dsize, truncation occurred. 29*4a5d661aSToomas Soome */ 30*4a5d661aSToomas Soome size_t 31*4a5d661aSToomas Soome strlcpy(char * __restrict dst, const char * __restrict src, size_t dsize) 32*4a5d661aSToomas Soome { 33*4a5d661aSToomas Soome const char *osrc = src; 34*4a5d661aSToomas Soome size_t nleft = dsize; 35*4a5d661aSToomas Soome 36*4a5d661aSToomas Soome /* Copy as many bytes as will fit. */ 37*4a5d661aSToomas Soome if (nleft != 0) { 38*4a5d661aSToomas Soome while (--nleft != 0) { 39*4a5d661aSToomas Soome if ((*dst++ = *src++) == '\0') 40*4a5d661aSToomas Soome break; 41*4a5d661aSToomas Soome } 42*4a5d661aSToomas Soome } 43*4a5d661aSToomas Soome 44*4a5d661aSToomas Soome /* Not enough room in dst, add NUL and traverse rest of src. */ 45*4a5d661aSToomas Soome if (nleft == 0) { 46*4a5d661aSToomas Soome if (dsize != 0) 47*4a5d661aSToomas Soome *dst = '\0'; /* NUL-terminate dst */ 48*4a5d661aSToomas Soome while (*src++) 49*4a5d661aSToomas Soome ; 50*4a5d661aSToomas Soome } 51*4a5d661aSToomas Soome 52*4a5d661aSToomas Soome return(src - osrc - 1); /* count does not include NUL */ 53*4a5d661aSToomas Soome } 54