另类设置程序参数

for ( argp = argv+1 ; *argp ; argp++ ) { if ( **argp == '-' ) { opt = *argp + 1; if ( !*opt ) usage(); while ( *opt ) { switch ( *opt ) { case 's': /* Use "safe, slow and stupid" code */ stupid = 1; break; case 'r': /* RAID mode */ raid_mode = 1; break; case 'f': /* Force install */ force = 1; break; case 'm': /* Install MBR */ mbr = 1; break; case 'a': /* Mark this partition active */ setactive = 1; break; case 'd': if ( argp[1] ) subdir = *++argp; break; default: usage(); break; } opt++; } } else { if ( bootsecfile ) usage(); else if ( drive ) bootsecfile = *argp; else drive = *argp; } }