strcopy.c

来自「arm ads1.2 with crack.rar」· C语言 代码 · 共 40 行

/* Example 4-1 */

#include <stdio.h>

void my_strcpy(const char *src, char *dst)
{
    int ch;
    __asm
    {
    loop:
#ifndef __thumb
        // ARM version
        LDRB    ch, [src], #1
        STRB    ch, [dst], #1
#else
        // Thumb version
        LDRB    ch, [src]
        ADD     src, #1
        STRB    ch, [dst]
        ADD     dst, #1
#endif
        CMP     ch, #0
        BNE     loop
    }
}


int main(void)
{
    const char *a = "Hello world!";
    char b[20];

    my_strcpy (a,b);

    printf("Original string: '%s'\n", a);
    printf("Copied   string: '%s'\n", b);
    return 0;
}