69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#include <stdio.h> /* fprintf */
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#include <stdlib.h> /* contains exit */
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#include <sys/types.h> /* unistd.h needs this */
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#include <unistd.h> /* contains read/write */
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#include <fcntl.h>
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#define MINIX_HEADER 32
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#define GCC_HEADER 1024
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void die(char * str)
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{
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fprintf(stderr,"%s\n",str);
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exit(1);
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}
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void usage(void)
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{
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die("Usage: build boot system [> image]");
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}
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int main(int argc, char ** argv)
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{
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int i,c,id;
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char buf[1024];
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if (argc != 3)
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usage();
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for (i=0;i<sizeof buf; i++) buf[i]=0;
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if ((id=open(argv[1],O_RDONLY,0))<0)
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die("Unable to open 'boot'");
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if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
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die("Unable to read header of 'boot'");
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if (((long *) buf)[0]!=0x04100301)
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[1]!=MINIX_HEADER)
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[3]!=0)
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die("Illegal data segment in 'boot'");
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if (((long *) buf)[4]!=0)
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die("Illegal bss in 'boot'");
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if (((long *) buf)[5] != 0)
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[7] != 0)
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die("Illegal symbol table in 'boot'");
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i=read(id,buf,sizeof buf);
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fprintf(stderr,"Boot sector %d bytes.\n",i);
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if (i>510)
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die("Boot block may not exceed 510 bytes");
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buf[510]=0x55;
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buf[511]=0xAA;
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i=write(1,buf,512);
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if (i!=512)
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die("Write call failed");
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close (id);
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if ((id=open(argv[2],O_RDONLY,0))<0)
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die("Unable to open 'system'");
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if (read(id,buf,GCC_HEADER) != GCC_HEADER)
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die("Unable to read header of 'system'");
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if (((long *) buf)[5] != 0)
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die("Non-GCC header of 'system'");
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for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
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if (write(1,buf,c)!=c)
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die("Write call failed");
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close(id);
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fprintf(stderr,"System %d bytes.\n",i);
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return(0);
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}
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