/* $NetBSD: strlcat.c,v 1.1.1.1 2020/06/15 01:52:54 christos Exp $ */ /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */ /* * Copyright (c) 1998 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #if !defined(_KERNEL) && !defined(_STANDALONE) #if HAVE_CONFIG_H #include "config.h" #endif #include #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: strlcat.c,v 1.1.1.1 2020/06/15 01:52:54 christos Exp $"); #endif /* LIBC_SCCS and not lint */ #ifdef _LIBC #include "namespace.h" #endif #include #include #include #ifdef _LIBC # ifdef __weak_alias __weak_alias(strlcat, _strlcat) # endif #endif #else #include #endif /* !_KERNEL && !_STANDALONE */ #if !HAVE_STRLCAT /* * Appends src to string dst of size siz (unlike strncat, siz is the * full size of dst, not space left). At most siz-1 characters * will be copied. Always NUL terminates (unless siz <= strlen(dst)). * Returns strlen(src) + MIN(siz, strlen(initial dst)). * If retval >= siz, truncation occurred. */ size_t strlcat(char *dst, const char *src, size_t siz) { #if 1 char *d = dst; const char *s = src; size_t n = siz; size_t dlen; /* Find the end of dst and adjust bytes left but don't go past end */ while (n-- != 0 && *d != '\0') d++; dlen = d - dst; n = siz - dlen; if (n == 0) return(dlen + strlen(s)); while (*s != '\0') { if (n != 1) { *d++ = *s; n--; } s++; } *d = '\0'; return(dlen + (s - src)); /* count does not include NUL */ #else /* * Find length of string in dst (maxing out at siz). */ size_t dlen = strnlen(dst, siz); /* * Copy src into any remaining space in dst (truncating if needed). * Note strlcpy(dst, src, 0) returns strlen(src). */ return dlen + strlcpy(dst + dlen, src, siz - dlen); #endif } #endif