string.c

来自「国产CPU－龙芯（loongson)BIOS源代码」· C语言 代码 · 共 63 行

/* Simple string functions */
#include <stdio.h>

int strlen(char *str)
{
    int i = 0;
    while(str[i++] != NULL)
    {
	if (i>0x100000)
	{
	    WARNING("String too large\n");
	    panic("die\n");
	}
    }
    return i;
}

void strcpy(char *to, char *from)
{
    int i,j;
    int count = 0;
    i = strlen(to);
    j = strlen(from);
    for (count = 0; count < j; count++)
    {
	to[count] = from[count];
	i--;
	if (i == 0)
	    break;
    }
    if (i)
    {
	for (j = count; j < i+count; j++)
	    to[j] = 0;
    }
}

int strcmp(char *to, char *from)
{
    int i,j;
    int count = 0;
    i = strlen(to);
    j = strlen(from);
    for (count=0;count<j;count++)
    {
	i--;
	if (to[count] == from[count])
	    continue;
	else
	{
	    if (to[count] > from[count])
		return 1;
	    else
		return -1;
	}
	if (i == 0)
	    return -1;
    }
    if (i)
	return 1;
    return 0;
}