Apple-2-SW/dos33fsprogs
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Fix gcc-flagged potential type conversion error.

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This commit is contained in:
Vince Weaver 2012-05-02 11:31:50 -04:00
parent 85d0c1aa35
commit 38d90a85ec
1 changed files with 23 additions and 6 deletions
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29
dos33.c
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@ -31,6 +31,15 @@ static int ones_lookup[16]={
/* 0xf = 1111 */ 4,
};
static unsigned char get_high_byte(int value) {
return (value>>8)&0xff;
}
static unsigned char get_low_byte(int value) {
return (value&0xff);
}
#define FILE_NORMAL 0
#define FILE_DELETED 1
@ -505,19 +514,27 @@ static int dos33_add_file(int fd,char type,char *filename,
/* we aren't the first t/s list so do special stuff */
/* load in the old t/s list */
lseek(fd,DISK_OFFSET((old_ts_list>>8)&0xff,old_ts_list&0xff),SEEK_SET);
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=read(fd,&sector_buffer,BYTES_PER_SECTOR);
/* point from old ts list to new one we just made */
sector_buffer[TSL_NEXT_TRACK]=(ts_list>>8)&0xff;
sector_buffer[TSL_NEXT_SECTOR]=(ts_list)&0xff;
sector_buffer[TSL_NEXT_TRACK]=get_high_byte(ts_list);
sector_buffer[TSL_NEXT_SECTOR]=get_low_byte(ts_list);
/* set offset into file */
sector_buffer[TSL_OFFSET_H]=(((i-122)*256)>>8)&0xff;
sector_buffer[TSL_OFFSET_L]=(((i-122)*256)&0xff);
sector_buffer[TSL_OFFSET_H]=get_high_byte((i-122)*256);
sector_buffer[TSL_OFFSET_L]=get_low_byte((i-122)*256);
/* write out the old t/s list with updated info */
lseek(fd,DISK_OFFSET((old_ts_list>>8)&0xff,old_ts_list&0xff),SEEK_SET);
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
}
}