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Annotation of linux/tools/build.c, revision 1.1.1.3

1.1       root        1: #include <stdio.h>     /* fprintf */
                      2: #include <stdlib.h>    /* contains exit */
                      3: #include <sys/types.h> /* unistd.h needs this */
                      4: #include <unistd.h>    /* contains read/write */
                      5: #include <fcntl.h>
1.1.1.3 ! root        6: #include <string.h>
1.1       root        7: 
                      8: #define MINIX_HEADER 32
                      9: #define GCC_HEADER 1024
                     10: 
                     11: void die(char * str)
                     12: {
                     13:        fprintf(stderr,"%s\n",str);
                     14:        exit(1);
                     15: }
                     16: 
                     17: void usage(void)
                     18: {
                     19:        die("Usage: build boot system [> image]");
                     20: }
                     21: 
                     22: int main(int argc, char ** argv)
                     23: {
                     24:        int i,c,id;
                     25:        char buf[1024];
                     26: 
                     27:        if (argc != 3)
                     28:                usage();
                     29:        for (i=0;i<sizeof buf; i++) buf[i]=0;
                     30:        if ((id=open(argv[1],O_RDONLY,0))<0)
                     31:                die("Unable to open 'boot'");
                     32:        if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
                     33:                die("Unable to read header of 'boot'");
                     34:        if (((long *) buf)[0]!=0x04100301)
                     35:                die("Non-Minix header of 'boot'");
                     36:        if (((long *) buf)[1]!=MINIX_HEADER)
                     37:                die("Non-Minix header of 'boot'");
                     38:        if (((long *) buf)[3]!=0)
                     39:                die("Illegal data segment in 'boot'");
                     40:        if (((long *) buf)[4]!=0)
                     41:                die("Illegal bss in 'boot'");
                     42:        if (((long *) buf)[5] != 0)
                     43:                die("Non-Minix header of 'boot'");
                     44:        if (((long *) buf)[7] != 0)
                     45:                die("Illegal symbol table in 'boot'");
                     46:        i=read(id,buf,sizeof buf);
                     47:        fprintf(stderr,"Boot sector %d bytes.\n",i);
                     48:        if (i>510)
                     49:                die("Boot block may not exceed 510 bytes");
                     50:        buf[510]=0x55;
                     51:        buf[511]=0xAA;
                     52:        i=write(1,buf,512);
                     53:        if (i!=512)
                     54:                die("Write call failed");
                     55:        close (id);
                     56:        
                     57:        if ((id=open(argv[2],O_RDONLY,0))<0)
                     58:                die("Unable to open 'system'");
1.1.1.3 ! root       59: //     if (read(id,buf,GCC_HEADER) != GCC_HEADER)
        !            60: //             die("Unable to read header of 'system'");
        !            61: //     if (((long *) buf)[5] != 0)
        !            62: //             die("Non-GCC header of 'system'");
1.1       root       63:        for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
                     64:                if (write(1,buf,c)!=c)
                     65:                        die("Write call failed");
1.1.1.2   root       66: 
                     67:        /* only needed by qemu. ( qemu may not read last sector if
                     68:         * size is < 512 bytes ) 
                     69:         */
                     70:        memset(buf,0,512);
                     71:        write(1,buf,512);       
                     72: 
1.1       root       73:        close(id);
                     74:        fprintf(stderr,"System %d bytes.\n",i);
                     75:        return(0);
                     76: }

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