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Diffstat (limited to 'sysdeps/vax/strncat.s')
| -rw-r--r-- | sysdeps/vax/strncat.s | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/sysdeps/vax/strncat.s b/sysdeps/vax/strncat.s new file mode 100644 index 0000000000..bcf29c16c7 --- /dev/null +++ b/sysdeps/vax/strncat.s @@ -0,0 +1,83 @@ +/* + * Copyright (c) 1983 Regents of the University of California. + * All rights reserved. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) + .asciz "@(#)strncat.s 5.6 (Berkeley) 6/1/90" +#endif /* LIBC_SCCS and not lint */ + +/* + * Concatenate string s2 on the end of s1 + * and return the base of s1. The parameter + * n is the maximum length of string s2 to + * concatenate. + * + * char * + * strncat(s1, s2, n) + * char *s1, *s2; + * int n; + */ +#include "DEFS.h" + +ENTRY(strncat, R6) + movl 12(ap),r6 # r6 = n + bleq done # n <= 0 + movl 4(ap),r3 # r3 = s1 + movl r3,r1 +0: + locc $0,$65535,(r1) + beql 0b + movl r1,r3 # r3 = index(s1, '\0'); + movl 8(ap),r1 # r1 = s2 +1: + movzwl $65535,r2 # r2 = bytes in first chunk + cmpl r6,r2 # r2 = min(bytes in chunk, n); + jgeq 2f + movl r6,r2 +2: + subl2 r2,r6 # update n + locc $0,r2,(r1) # '\0' found? + jneq 3f + subl2 r2,r1 # back up pointer updated by locc + movc3 r2,(r1),(r3) # copy in next piece + tstl r6 # run out of space? + jneq 1b + clrb (r3) # force '\0' termination + jbr done +3: + subl2 r0,r2 # r2 = number of bytes to move + subl2 r2,r1 # back up pointer updated by locc + incl r2 # copy '\0' as well + movc3 r2,(r1),(r3) # copy in last piece +done: + movl 4(ap),r0 # return s1 + ret |