打印内存log的代码实现

void HexDump(char *buf,int len,int addr) {
    int i,j,k;
    char binstr[80];
 
    for (i=0;i<len;i++) {
        if (0==(i%16)) {
            sprintf(binstr,"%08x -",i+addr);
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        } else if (15==(i%16)) {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
            sprintf(binstr,"%s  ",binstr);
            for (j=i-15;j<=i;j++) {
                sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
            }
            printf("%s\n",binstr);
        } else {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        }
    }
    if (0!=(i%16)) {
        k=16-(i%16);
        for (j=0;j<k;j++) {
            sprintf(binstr,"%s   ",binstr);
        }
        sprintf(binstr,"%s  ",binstr);
        k=16-k;
        for (j=i-k;j<i;j++) {
            sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
        }
        printf("%s\n",binstr);
    }
}
 
int main(void)
{
	char buf[40] = "125a3ADC566742->->45!23afasdb2345~+asd";
	HexDump(buf, strlen(buf), (int)buf);
	return 0;
}

运行效果如下：

修改为不换行：

char* wswHexDump(char *buf,int len,char *ret_buf) {
    char binstr[1024];
    int i = 0;
    if(len>sizeof(binstr)){
    return "len is too long";
    }
    for (i=0;i<len;i++) {
        if (0==(i%len)) {
            sprintf(binstr,"%s","BufMemInfo:");
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        } else if ((len-1)==(i%len)) {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
            sprintf(ret_buf,"%s  ",binstr);
        } else {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        }
    }
    return ret_buf;
}

//下面是调用。
	char test[]="1234567890abcDEFHIJK";
    tmp[512]=""; 
    printf("%s\n",wswHexDump(test,10,tmp));
    printf("%s\n",wswHexDump(test,20,tmp));
    printf("%s\n",wswHexDump(test,40,tmp));