diff options
Diffstat (limited to 'libc/string/strncat.c')
-rw-r--r-- | libc/string/strncat.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/libc/string/strncat.c b/libc/string/strncat.c new file mode 100644 index 0000000..1cb9405 --- /dev/null +++ b/libc/string/strncat.c @@ -0,0 +1,57 @@ +/* $OpenBSD: strncat.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <string.h> + +/* + * Concatenate src on the end of dst. At most strlen(dst)+n+1 bytes + * are written at dst (at most n+1 bytes being appended). Return dst. + */ +char * +strncat(char *dst, const char *src, size_t n) +{ + if (n != 0) { + char *d = dst; + const char *s = src; + + while (*d != 0) + d++; + do { + if ((*d = *s++) == 0) + break; + d++; + } while (--n != 0); + *d = 0; + } + return (dst); +} |