● Linus's Linux--tools/build.c - 荔园在线 | 深圳大学学生论坛,荔园晨风BBS,深大在线网站

荔园之美，在春之萌芽，在夏之绽放，在秋之收获，在冬之沉淀

发信人: GyeaonWoo (柏林恋人), 信区: Linux
标  题: Linus's Linux--tools/build.c
发信站: 荔园晨风BBS站 (Mon Aug 25 20:16:07 2003), 站内信件

#include <stdio.h>      /* fprintf */
#include <stdlib.h>     /* contains exit */
#include <sys/types.h>  /* unistd.h needs this */
#include <unistd.h>     /* contains read/write */
#include <fcntl.h>

#define MINIX_HEADER 32
#define GCC_HEADER 1024

void die(char * str)
{
        fprintf(stderr,"%s\n",str);
        exit(1);
}

void usage(void)
{
        die("Usage: build boot system [> image]");
}

int main(int argc, char ** argv)
{
        int i,c,id;
        char buf[1024];

        if (argc != 3)
                usage();
        for (i=0;i<sizeof buf; i++) buf[i]=0;
        if ((id=open(argv[1],O_RDONLY,0))<0)
                die("Unable to open 'boot'");
        if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
                die("Unable to read header of 'boot'");
        if (((long *) buf)[0]!=0x04100301)
                die("Non-Minix header of 'boot'");
        if (((long *) buf)[1]!=MINIX_HEADER)
                die("Non-Minix header of 'boot'");
        if (((long *) buf)[3]!=0)
                die("Illegal data segment in 'boot'");
        if (((long *) buf)[4]!=0)
                die("Illegal bss in 'boot'");
        if (((long *) buf)[5] != 0)
                die("Non-Minix header of 'boot'");
        if (((long *) buf)[7] != 0)
                die("Illegal symbol table in 'boot'");
        i=read(id,buf,sizeof buf);
        fprintf(stderr,"Boot sector %d bytes.\n",i);
        if (i>510)
                die("Boot block may not exceed 510 bytes");
        buf[510]=0x55;
        buf[511]=0xAA;
        i=write(1,buf,512);
        if (i!=512)
                die("Write call failed");
        close (id);

        if ((id=open(argv[2],O_RDONLY,0))<0)
                die("Unable to open 'system'");
        if (read(id,buf,GCC_HEADER) != GCC_HEADER)
                die("Unable to read header of 'system'");
        if (((long *) buf)[5] != 0)
                die("Non-GCC header of 'system'");
        for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
                if (write(1,buf,c)!=c)
                        die("Write call failed");
        close(id);
        fprintf(stderr,"System %d bytes.\n",i);
        return(0);
}

--
刻录服务，质量保证，5元一张，多刻有折，自己提供空碟2元刻一张
刻录上传：ftp：upload:upload@192.168.35.5:614

※ 来源:·荔园晨风BBS站 bbs.szu.edu.cn·[FROM: 192.168.35.5]

荔园在线首页友情链接：深圳大学深大招生荔园晨风BBS S-Term软件网络书店