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Annotation of linux/tools/build.c, revision 1.1

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

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