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75 lines
2.5 KiB
C
75 lines
2.5 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 : strchr.c
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Author : Richard A. O'Keefe.
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Michael Widenius: ifdef MC68000
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Updated: 20 April 1984
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Defines: strchr(), index()
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strchr(s, c) returns a pointer to the first place in s where c
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occurs, or NullS if c does not occur in s. This function is called
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index in V7 and 4.?bsd systems; while not ideal the name is clearer
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than strchr, so index remains in strings.h as a macro. NB: strchr
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looks for single characters, not for sets or strings. To find the
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NUL character which closes s, use strchr(s, '\0') or strend(s). The
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parameter 'c' is declared 'int' so it will go in a register; if your
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C compiler is happy with register _char_ change it to that.
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*/
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#include "strings.h"
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#if defined(MC68000) && defined(DS90)
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char* strchr(char *s, pchar c)
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{
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asm(" movl 4(a7),a0 ");
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asm(" movl 8(a7),d1 ");
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asm(".L2: movb (a0)+,d0 ");
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asm(" cmpb d0,d1 ");
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asm(" beq .L1 ");
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asm(" tstb d0 ");
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asm(" bne .L2 ");
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asm(" moveq #0,d0 ");
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asm(" rts ");
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asm(".L1: movl a0,d0 ");
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asm(" subql #1,d0 ");
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}
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#else
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char *strchr(register const char *s, register pchar c)
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{
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for (;;)
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{
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if (*s == (char) c) return (char*) s;
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if (!*s++) return NullS;
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}
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}
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#endif
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