1*3955d011SMarcel Moolenaar /* $NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */ 2*3955d011SMarcel Moolenaar /* $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */ 3*3955d011SMarcel Moolenaar 4*3955d011SMarcel Moolenaar /* 5*3955d011SMarcel Moolenaar * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6*3955d011SMarcel Moolenaar * 7*3955d011SMarcel Moolenaar * Permission to use, copy, modify, and distribute this software for any 8*3955d011SMarcel Moolenaar * purpose with or without fee is hereby granted, provided that the above 9*3955d011SMarcel Moolenaar * copyright notice and this permission notice appear in all copies. 10*3955d011SMarcel Moolenaar * 11*3955d011SMarcel Moolenaar * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 12*3955d011SMarcel Moolenaar * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 13*3955d011SMarcel Moolenaar * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 14*3955d011SMarcel Moolenaar * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15*3955d011SMarcel Moolenaar * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 16*3955d011SMarcel Moolenaar * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 17*3955d011SMarcel Moolenaar * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18*3955d011SMarcel Moolenaar */ 19*3955d011SMarcel Moolenaar 20*3955d011SMarcel Moolenaar #ifdef HAVE_CONFIG_H 21*3955d011SMarcel Moolenaar # include <config.h> 22*3955d011SMarcel Moolenaar #endif 23*3955d011SMarcel Moolenaar #ifndef HAVE_STRLCPY 24*3955d011SMarcel Moolenaar 25*3955d011SMarcel Moolenaar #include <sys/cdefs.h> 26*3955d011SMarcel Moolenaar 27*3955d011SMarcel Moolenaar #include <sys/types.h> 28*3955d011SMarcel Moolenaar #include <string.h> 29*3955d011SMarcel Moolenaar 30*3955d011SMarcel Moolenaar /* 31*3955d011SMarcel Moolenaar * Copy src to string dst of size siz. At most siz-1 characters 32*3955d011SMarcel Moolenaar * will be copied. Always NUL terminates (unless siz == 0). 33*3955d011SMarcel Moolenaar * Returns strlen(src); if retval >= siz, truncation occurred. 34*3955d011SMarcel Moolenaar */ 35*3955d011SMarcel Moolenaar size_t 36*3955d011SMarcel Moolenaar strlcpy(char *dst, const char *src, size_t siz) 37*3955d011SMarcel Moolenaar { 38*3955d011SMarcel Moolenaar char *d = dst; 39*3955d011SMarcel Moolenaar const char *s = src; 40*3955d011SMarcel Moolenaar size_t n = siz; 41*3955d011SMarcel Moolenaar 42*3955d011SMarcel Moolenaar if (!dst || !src) 43*3955d011SMarcel Moolenaar return 0; 44*3955d011SMarcel Moolenaar 45*3955d011SMarcel Moolenaar /* Copy as many bytes as will fit */ 46*3955d011SMarcel Moolenaar if (n != 0 && --n != 0) { 47*3955d011SMarcel Moolenaar do { 48*3955d011SMarcel Moolenaar if ((*d++ = *s++) == 0) 49*3955d011SMarcel Moolenaar break; 50*3955d011SMarcel Moolenaar } while (--n != 0); 51*3955d011SMarcel Moolenaar } 52*3955d011SMarcel Moolenaar 53*3955d011SMarcel Moolenaar /* Not enough room in dst, add NUL and traverse rest of src */ 54*3955d011SMarcel Moolenaar if (n == 0) { 55*3955d011SMarcel Moolenaar if (siz != 0) 56*3955d011SMarcel Moolenaar *d = '\0'; /* NUL-terminate dst */ 57*3955d011SMarcel Moolenaar while (*s++) 58*3955d011SMarcel Moolenaar ; 59*3955d011SMarcel Moolenaar } 60*3955d011SMarcel Moolenaar 61*3955d011SMarcel Moolenaar return(s - src - 1); /* count does not include NUL */ 62*3955d011SMarcel Moolenaar } 63*3955d011SMarcel Moolenaar #endif 64