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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* Copyright Richard A. O'Keefe.
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Copyright (c) 2000 TXT DataKonsult Ab & Monty Program Ab
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Copyright (c) 2009-2011, Monty Program Ab
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/* File : strlen.c
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Author : Richard A. O'Keefe. / Monty
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Michael Widenius; ifdef MC68000
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Updated: 1986-11-30
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Defines: strlen()
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strlen(s) returns the number of characters in s, that is, the number
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of non-NUL characters found before the closing NULEosCh. Note: some
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non-standard C compilers for 32-bit machines take int to be 16 bits,
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either put up with short strings or change int to long throughout
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this package. Better yet, BOYCOTT such shoddy compilers.
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Beware: the asm version works only if strlen(s) < 65536.
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*/
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#include "strings.h"
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#if VaxAsm
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size_t strlen(char *s)
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{
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asm("locc $0,$65535,*4(ap)");
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asm("subl3 r0,$65535,r0");
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}
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#else
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#if defined(MC68000) && defined(DS90)
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size_t strlen(char *s)
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{
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asm(" movl 4(a7),a0 ");
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asm(" movl a0,a1 ");
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asm(".L4: tstb (a0)+ ");
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asm(" jne .L4 ");
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asm(" movl a0,d0 ");
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asm(" subl a1,d0 ");
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asm(" subql #1,d0 ");
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}
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#else
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size_t strlen(register char *s)
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{
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register char *startpos;
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startpos = s;
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while (*s++);
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return ((size_t) (s-startpos-1));
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}
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#endif
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#endif
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