strlen.c
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上传日期:2022-05-23
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- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* File : strlen.c
- Author : Richard A. O'Keefe. / Monty
- Michael Widenius; ifdef MC68000
- Updated: 1986-11-30
- Defines: strlen()
- strlen(s) returns the number of characters in s, that is, the number
- of non-NUL characters found before the closing NULEosCh. Note: some
- non-standard C compilers for 32-bit machines take int to be 16 bits,
- either put up with short strings or change int to long throughout
- this package. Better yet, BOYCOTT such shoddy compilers.
- Beware: the asm version works only if strlen(s) < 65536.
- */
- #include "strings.h"
- #if VaxAsm
- size_s strlen(char *s)
- {
- asm("locc $0,$65535,*4(ap)");
- asm("subl3 r0,$65535,r0");
- }
- #else
- #if defined(MC68000) && defined(DS90)
- size_s strlen(char *s)
- {
- asm(" movl 4(a7),a0 ");
- asm(" movl a0,a1 ");
- asm(".L4: tstb (a0)+ ");
- asm(" jne .L4 ");
- asm(" movl a0,d0 ");
- asm(" subl a1,d0 ");
- asm(" subql #1,d0 ");
- }
- #else
- size_s strlen(register char *s)
- {
- register char *startpos;
- startpos = s;
- while (*s++);
- return ((size_s) (s-startpos-1));
- }
- #endif
- #endif