自制操作系统日记（7）：字符串显示

D:\\software\\NASM\\nasm.exe bootsect.asm -o bootsect.bin -l bootsect.lstD:\\software\\NASM\\nasm.exe setup.asm -o setup.bin  -l setup.lst
@REM 主函数编译gcc -m32 -fno-asynchronous-unwind-tables -s -O2 -c -o .\\c\\start.o .\\c\\start.cD:\\software\\objconv\\objconv.exe -fnasm .\\c\\start.o .\\c\\nasm\\start.asm
@REM 字体文件编译.\makefont.exe .\hankaku.txt .\hankaku.bin.\bin2obj.exe .\hankaku.bin .\hankaku.obj _hankakuD:\\software\\objconv\\objconv.exe -fnasm .\hankaku.obj .\\c\\nasm\\hankaku.asm
@REM 处理生成的nasm不合理的的地方D:\\software\\python3\\python.exe E:\\code\\python\\self\\tools\\tools\\objconv2nasm_clearn.py
@REM 合并文件，编译运行copy /B head.asm+.\\c\\clean\\start.asm+func.asm+.\\c\\clean\\hankaku.asm kernel.asmD:\\software\\NASM\\nasm.exe kernel.asm -o kernel.bin -l kernel.lstcopy /B bootsect.bin+setup.bin+kernel.bin  os.isoD:\\software\\Bochs-2.7\\bochs -q -f D:\\software\\Bochs-2.7\\dlxlinux\\bochsrc_m.bxrc

import os

def clean_nasm_file(file_name, nasm_path, clean_path):    nasm_file = nasm_path + "\\" + file_name    clean_file = clean_path + "\\" + file_name    with open(clean_file, "w") as fw:        with open(nasm_file, "r") as fr:            content = fr.readline()            while content:                if content.startswith("global") or content.startswith("extern"):                    content = fr.readline()                    continue                content = content.replace("noexecute", "")                content = content.replace("execute", "")                fw.write(content)                content = fr.readline()

if __name__ == "__main__":    nasm_path = "E:\\code\\other\\self\\operating-system\\c\\nasm"    clean_path = "E:\\code\\other\\self\\operating-system\\c\\clean"    files = os.listdir(nasm_path)    for file in files:        if not os.path.isdir(file):            clean_nasm_file(file, nasm_path, clean_path)

......void putfont8(char *vram, int xsize, int x, int y, char c, char *font);void putfont8_asc(char *vram, int xsize, int x, int y, char c, unsigned char *s);
void start(void){    ......
    putfont8_asc(vram, xsize, 8, 8, COL8_FFFFFF, "Hollo OS!");
    ......}
void putfont8_asc(char *vram, int xsize, int x, int y, char c,  unsigned char *s){   extern char hankaku[4096];    /* C语言中，字符串都是以0x00结尾 */    for (; *s != 0x00; s++) {  putfont8(vram, xsize, x, y, c, hankaku + *s * 16);  x += 8;    }    return; }
void putfont8(char *vram, int xsize, int x, int y, char c,  char *font){    int i;    char *p, d /* data */;    for (i = 0; i < 16; i++) {        p = vram + (y + i) * xsize + x;        d = font[i];        if ((d & 0x80) != 0) { p[0] = c; }        if ((d & 0x40) != 0) { p[1] = c; }        if ((d & 0x20) != 0) { p[2] = c; }        if ((d & 0x10) != 0) { p[3] = c; }        if ((d & 0x08) != 0) { p[4] = c; }        if ((d & 0x04) != 0) { p[5] = c; }        if ((d & 0x02) != 0) { p[6] = c; }        if ((d & 0x01) != 0) { p[7] = c; }    }    return;}