strend.c

来自「Many C samples. It is a good sample for 」· C语言 代码 · 共 35 行

/*  File   : strend.c
    Author : Richard A. O'Keefe.
    Updated: 23 April 1984
    Defines: strend()

    strend(s) returns a character pointer to the NUL which ends s.  That
    is,  strend(s)-s  ==  strlen(s). This is useful for adding things at
    the end of strings.  It is redundant, because  strchr(s,'\0')  could
    be used instead, but this is clearer and faster.
    Beware: the asm version works only if strlen(s) < 65535.
*/

#include "strings.h"

#if	VaxAsm

char *strend(s)
    char *s;
    {
	asm("locc $0,$65535,*4(ap)");
	asm("movl r1,r0");
    }

#else  ~VaxAsm 

char *strend(s)
    register char *s;
    {
	while (*s++);
	return s-1;
    }

#endif	VaxAsm