[Toybox] blkid fixed for strict-alias
Conroy, Bradley Quentin
bconroy at uis.edu
Mon Oct 7 10:19:05 PDT 2013
I missed the warnings on compile (it was ~5AM) but I really don't know if like the fix:
using a typedef with __attribute__((__may_alias__))
/* blkid.c - Prints type, label and UUID of filesystem(s).
*
* Copyright 2013 Brad Conroy <bconroy at uis.edu>
*
* See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
USE_BLKID(NEWTOY(blkid, NULL, TOYFLAG_BIN))
config BLKID
bool "blkid"
default n
help
usage: blkid [block device...]
Prints type, label and UUID of filesystem.
*/
#define FOR_blkid
#include "toys.h"
typedef struct fs_info{
unsigned uuid_off;
unsigned lab_off;
short uuid_t;
short lab_len;
}fs_info_t;
typedef unsigned short __attribute__((__may_alias__)) short_t;
typedef unsigned long __attribute__((__may_alias__)) long_t;
#define BIT(x) (1<<(x))
#define _MATCH(buf,type,offset,match) (*((type *)&buf[offset])==(match))
#define MATCH2(b,a) (_MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC2)||MATCH(b,a))
#define MATCH3(b,a) (_MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC3)||MATCH2(b,a))
#define MATCH(b,a) _MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC)
/* may need to check endianess for C2I */
#define C2I(a,b,c,d) (a|(b<<8)|(c<<16)|(d<<24))
#define SET_FS(t) (fs_info_t)t##_INFO
#define ADFS_MAGIC 0xadf5
#define ADFS_TYPE short_t
#define ADFS_OFFSET 0xc00
#define ADFS_INFO {0,0,0,0} /*todo*/
#define BFS_MAGIC 0x1badface
#define BFS_TYPE long_t
#define BFS_OFFSET 0
#define BFS_INFO {0,0,0,0}
/*won't fit in 1 toybuf*/
#define BTRFS_MAGIC C2I('_','B','H','R') //'RHB_'
//#define BTRFS_MAGIC2 'M_Sf' /*not currently used*/
//#define BTRFS_OFFSET2 65604 /*not currently used*/
#define BTRFS_TYPE long_t /*change to long_t long_t if full magic used?*/
#define BTRFS_OFFSET 65600
#define BTRFS_INFO {65803,65819,16,256}
#define CRAMFS_MAGIC 0x28cd3d45
#define CRAMFS_MAGIC2 0x453dcd28
#define CRAMFS_TYPE long_t
#define CRAMFS_OFFSET 0
#define CRAMFS_INFO {0,48,0,16}
#define EXT_MAGIC 0xEF53
#define EXT_MAGIC2 0xEF51
#define EXT_MAGIC3 0x53EF
#define EXT_TYPE short_t
#define EXT_OFFSET 1080
#define EXT3_BYTE 1116
#define EXT4_BYTE 1120
#define EXT_INFO {1128,1144,16,16}
#define F2FS_MAGIC 0xF2F52010
#define F2FS_TYPE long_t
#define F2FS_OFFSET 1024
#define F2FS_INFO {1132,1110,16,16}
/*won't fit in 1 toybuf*/
#define JFS_MAGIC C2I('J','S','F','1') //'1SFJ'
#define JFS_TYPE long_t
#define JFS_OFFSET 32768
#define JFS_INFO {32920,32904,16,16}
#define NILFS_MAGIC 0x3434
#define NILFS_TYPE short_t
#define NILFS_OFFSET 1030
#define NILFS_INFO {1176,1192,16,80}
#define NTFS_MAGIC C2I('N','T','F','S') //'SFTN'
#define NTFS_TYPE long_t
#define NTFS_OFFSET 3
#define NTFS_INFO {0x48,0X4D80,8,-8}
/*won't fit in 1 toybuf*/
#define REISER_MAGIC C2I('R','e','I','s') //'sIeR'
#define REISER_TYPE long_t
#define REISER_OFFSET 8244
#define REISER_INFO {8276,8292,16,16}
#define REISERB_MAGIC REISER_MAGIC //'sIeR'
#define REISERB_TYPE REISER_TYPE
#define REISERB_OFFSET 65588
#define REISERB_INFO {65620,65636,16,16}
#define ROMFS_MAGIC C2I('r','o','m','-') //'-mor'
#define ROMFS_OFFSET 0
#define ROMFS_TYPE long_t
#define ROMFS_INFO {0,0,0,0}
#define SQUASHFS_OFFSET 0
#define SQUASHFS_TYPE long_t
#define SQUASHFS_MAGIC 0x73717368
#define SQUASHFS_INFO {0,0,0,0}
#define XIAFS_OFFSET 572
#define XIAFS_TYPE long_t
#define XIAFS_MAGIC 0x012FD16D
#define XIAFS_INFO {0,0,0,0}
#define XFS_OFFSET 0
#define XFS_TYPE long_t
#define XFS_MAGIC C2I('X','F','S','B')
#define XFS_INFO {32,108,16,12}
#if (CFG_BLKID)
char *toutf8(short_t * ws){ /* hack for NTFS utf16 */
static char buf[16];
int i=0;
while((buf[i++]=*ws++));
return buf;
}
#endif
/* TODO if no args use proc/partitions */
void do_blkid(int fd, char *name){
fs_info_t fs;
char *fstype;
unsigned char buf[66560]; /*toybuf is only 4096, could rework logic*/
int sb_read;
sb_read = read(fd, &buf, sizeof(buf));
if (sb_read < 1) return;
if MATCH(buf,ADFS){
fstype="adfs";
if (CFG_BLKID) fs=SET_FS(ADFS);
}else if MATCH(buf,BFS){
fstype="bfs";
if (CFG_BLKID) fs=SET_FS(BFS);
}else if MATCH(buf,CRAMFS){
fstype="cramfs";
if (CFG_BLKID) fs=SET_FS(CRAMFS);
}else if MATCH3(buf,EXT){
fstype=(buf[EXT3_BYTE]&BIT(2))?((buf[EXT4_BYTE]&BIT(6))?"ext4":"ext3"):"ext2";
if (CFG_BLKID) fs=SET_FS(EXT);
}else if MATCH(buf,F2FS){
fstype="f2fs";
if (CFG_BLKID) fs=SET_FS(F2FS);
}else if MATCH(buf,NILFS){
fstype="nilfs";
if (CFG_BLKID) fs=SET_FS(NILFS);
}else if MATCH(buf,NTFS){
fstype="ntfs";
if (CFG_BLKID) fs=SET_FS(NTFS);
}else if MATCH(buf,XIAFS){
fstype="xiafs";
if (CFG_BLKID) fs=SET_FS(XIAFS);
/*below here would require more than 1 toybuf*/
}else if MATCH(buf,REISER){
fstype="reiserfs";
if (CFG_BLKID) fs=SET_FS(REISER);
}else if MATCH(buf,JFS){
fstype="jfs";
if (CFG_BLKID) fs=SET_FS(JFS);
}else if MATCH(buf,BTRFS){
fstype="btrfs";
if (CFG_BLKID) fs=SET_FS(BTRFS);
}else if MATCH(buf,REISERB){
fstype="reiserfs";
if (CFG_BLKID) fs=SET_FS(REISERB);
}else return;
if (CFG_BLKID && !strncmp("blkid",toys.which->name,5) ){
printf("%s:",name);
if ( fs.lab_len > 0 )
printf(" LABEL=\"%.*s\"", fs.lab_len, (char *)&buf[fs.lab_off]);
else if ( fs.lab_len < 0 )
printf(" LABEL=\"%.*s\"", -fs.lab_len,
toutf8((short_t *)&buf[fs.lab_off]));
if ( fs.uuid_off > 0 ){
if ( fs.uuid_t == 16 )
printf(" UUID=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x%02x%02x%02x%02x\"",
buf[fs.uuid_off], buf[fs.uuid_off+1],
buf[fs.uuid_off+2], buf[fs.uuid_off+3],
buf[fs.uuid_off+4], buf[fs.uuid_off+5],
buf[fs.uuid_off+6], buf[fs.uuid_off+7],
buf[fs.uuid_off+8], buf[fs.uuid_off+9],
buf[fs.uuid_off+10], buf[fs.uuid_off+11],
buf[fs.uuid_off+12], buf[fs.uuid_off+13],
buf[fs.uuid_off+14], buf[fs.uuid_off+15]);
if ( fs.uuid_t == 8 )
printf(" UUID=\"%02X%02X%02X%02X%02X%02X%02X%02X\"",
buf[fs.uuid_off+7], buf[fs.uuid_off+6],
buf[fs.uuid_off+5], buf[fs.uuid_off+4],
buf[fs.uuid_off+3], buf[fs.uuid_off+2],
buf[fs.uuid_off+1], buf[fs.uuid_off]);
}
printf(" TYPE=\"%s\"",fstype);
}else /* fstype */
write(1,fstype,strlen(fstype)); /* avoid printf overhead in fstype */
putchar('\n');
}
#if (CFG_BLKID)
void blkid_main(void)
{
loopfiles(toys.optargs, do_blkid);
}
#endif
1381166345.0
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