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Diffstat (limited to 'src/strlcat.c')
| -rw-r--r-- | src/strlcat.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/strlcat.c b/src/strlcat.c new file mode 100644 index 0000000..c1ef3a2 --- /dev/null +++ b/src/strlcat.c @@ -0,0 +1,90 @@ +/* $NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $ */ +/* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */ + +/* + * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> + * + * 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. + */ + +#include "config.h" + +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: strlcat.c,v 1.4 2013/01/23 07:57:27 matt Exp $"); +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <assert.h> +#include <string.h> + +#ifdef _LIBC +# ifdef __weak_alias +__weak_alias(strlcat, _strlcat) +# endif +#endif + +#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; + + _DIAGASSERT(dst != NULL); + _DIAGASSERT(src != NULL); + + /* 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 + _DIAGASSERT(dst != NULL); + _DIAGASSERT(src != NULL); + + /* + * 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 |