1410 lines
33 KiB
C
1410 lines
33 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
|
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* documentation is hereby granted, provided that both the copyright
|
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* notice and this permission notice appear in all copies of the
|
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/diskmbr.h>
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#include <sys/endian.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <libgeom.h>
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#include <paths.h>
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#include <regex.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int iotest;
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#define LBUF 100
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static char lbuf[LBUF];
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/*
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*
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* Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
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*
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* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
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* Copyright (c) 1989 Robert. V. Baron
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* Created.
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||
*/
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#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp
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#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
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#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
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#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
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static int secsize = 0; /* the sensed sector size */
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||
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static char *disk;
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||
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static int cyls, sectors, heads, cylsecs, disksecs;
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struct mboot {
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unsigned char padding[2]; /* force the longs to be long aligned */
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unsigned char *bootinst; /* boot code */
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off_t bootinst_size;
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struct dos_partition parts[NDOSPART];
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};
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static struct mboot mboot;
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static int fd;
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#define ACTIVE 0x80
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static uint dos_cyls;
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static uint dos_heads;
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static uint dos_sectors;
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static uint dos_cylsecs;
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#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
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#define DOSCYL(c) (c & 0xff)
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#define MAX_ARGS 10
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static int current_line_number;
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static int geom_processed = 0;
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static int part_processed = 0;
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static int active_processed = 0;
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typedef struct cmd {
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char cmd;
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int n_args;
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struct arg {
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char argtype;
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int arg_val;
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} args[MAX_ARGS];
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} CMD;
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static int B_flag = 0; /* replace boot code */
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static int I_flag = 0; /* use entire disk for FreeBSD */
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static int a_flag = 0; /* set active partition */
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static char *b_flag = NULL; /* path to boot code */
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static int i_flag = 0; /* replace partition data */
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static int u_flag = 0; /* update partition data */
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static int s_flag = 0; /* Print a summary and exit */
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static int t_flag = 0; /* test only */
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static char *f_flag = NULL; /* Read config info from file */
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static int v_flag = 0; /* Be verbose */
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static struct part_type
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{
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unsigned char type;
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const char *name;
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} part_types[] = {
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{0x00, "unused"}
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,{0x01, "Primary DOS with 12 bit FAT"}
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,{0x02, "XENIX / file system"}
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,{0x03, "XENIX /usr file system"}
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,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"}
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,{0x05, "Extended DOS"}
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,{0x06, "Primary 'big' DOS (>= 32MB)"}
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,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"}
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,{0x08, "AIX file system or SplitDrive"}
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,{0x09, "AIX boot partition or Coherent"}
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,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"}
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,{0x0B, "DOS or Windows 95 with 32 bit FAT"}
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,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"}
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,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"}
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,{0x0F, "Extended DOS (LBA)"}
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,{0x10, "OPUS"}
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,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"}
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,{0x12, "Compaq diagnostics"}
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,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"}
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,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"}
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,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"}
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,{0x18, "AST Windows swapfile"}
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,{0x24, "NEC DOS"}
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,{0x3C, "PartitionMagic recovery"}
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,{0x39, "plan9"}
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,{0x40, "VENIX 286"}
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,{0x41, "Linux/MINIX (sharing disk with DRDOS)"}
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,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"}
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,{0x43, "Linux native (sharing disk with DRDOS)"}
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,{0x4D, "QNX 4.2 Primary"}
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,{0x4E, "QNX 4.2 Secondary"}
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,{0x4F, "QNX 4.2 Tertiary"}
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,{0x50, "DM (disk manager)"}
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,{0x51, "DM6 Aux1 (or Novell)"}
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,{0x52, "CP/M or Microport SysV/AT"}
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,{0x53, "DM6 Aux3"}
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,{0x54, "DM6"}
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,{0x55, "EZ-Drive (disk manager)"}
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,{0x56, "Golden Bow (disk manager)"}
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,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */
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,{0x61, "SpeedStor"}
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,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"}
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,{0x64, "Novell Netware/286 2.xx"}
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,{0x65, "Novell Netware/386 3.xx"}
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,{0x70, "DiskSecure Multi-Boot"}
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,{0x75, "PCIX"}
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,{0x77, "QNX4.x"}
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,{0x78, "QNX4.x 2nd part"}
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,{0x79, "QNX4.x 3rd part"}
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,{0x80, "Minix until 1.4a"}
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,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"}
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,{0x82, "Linux swap or Solaris x86"}
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,{0x83, "Linux native"}
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,{0x84, "OS/2 hidden C: drive"}
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,{0x85, "Linux extended"}
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,{0x86, "NTFS volume set??"}
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,{0x87, "NTFS volume set??"}
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||
,{0x93, "Amoeba file system"}
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||
,{0x94, "Amoeba bad block table"}
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||
,{0x9F, "BSD/OS"}
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,{0xA0, "Suspend to Disk"}
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,{0xA5, "FreeBSD/NetBSD/386BSD"}
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,{0xA6, "OpenBSD"}
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,{0xA7, "NeXTSTEP"}
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,{0xA9, "NetBSD"}
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,{0xAC, "IBM JFS"}
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,{0xB7, "BSDI BSD/386 file system"}
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,{0xB8, "BSDI BSD/386 swap"}
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,{0xBE, "Solaris x86 boot"}
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,{0xBF, "Solaris x86 (new)"}
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,{0xC1, "DRDOS/sec with 12-bit FAT"}
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,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"}
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,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"}
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,{0xC7, "Syrinx"}
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,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"}
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,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"}
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,{0xE3, "DOS R/O or SpeedStor"}
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,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."}
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,{0xEB, "BeOS file system"}
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,{0xEE, "EFI GPT"}
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,{0xEF, "EFI System Partition"}
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,{0xF1, "SpeedStor"}
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,{0xF2, "DOS 3.3+ Secondary"}
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,{0xF4, "SpeedStor large partition"}
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,{0xFE, "SpeedStor >1024 cyl. or LANstep"}
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,{0xFF, "Xenix bad blocks table"}
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};
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static void print_s0(int which);
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static void print_part(int i);
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static void init_sector0(unsigned long start);
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static void init_boot(void);
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static void change_part(int i);
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static void print_params(void);
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static void change_active(int which);
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static void change_code(void);
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static void get_params_to_use(void);
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static char *get_rootdisk(void);
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static void dos(struct dos_partition *partp);
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static int open_disk(int flag);
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static ssize_t read_disk(off_t sector, void *buf);
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static int write_disk(off_t sector, void *buf);
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static int get_params(void);
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static int read_s0(void);
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static int write_s0(void);
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static int ok(const char *str);
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static int decimal(const char *str, int *num, int deflt);
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static const char *get_type(int type);
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static int read_config(char *config_file);
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static void reset_boot(void);
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static int sanitize_partition(struct dos_partition *);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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int c, i;
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int partition = -1;
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struct dos_partition *partp;
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while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1)
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switch (c) {
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case 'B':
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B_flag = 1;
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break;
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case 'I':
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I_flag = 1;
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break;
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case 'a':
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a_flag = 1;
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break;
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case 'b':
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b_flag = optarg;
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break;
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case 'f':
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f_flag = optarg;
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break;
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case 'i':
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i_flag = 1;
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break;
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case 's':
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s_flag = 1;
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break;
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case 't':
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t_flag = 1;
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break;
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case 'u':
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u_flag = 1;
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break;
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case 'v':
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v_flag = 1;
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break;
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case '1':
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case '2':
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case '3':
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case '4':
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partition = c - '0';
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break;
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default:
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usage();
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}
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if (f_flag || i_flag)
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u_flag = 1;
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if (t_flag)
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v_flag = 1;
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argc -= optind;
|
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argv += optind;
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if (argc == 0) {
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disk = get_rootdisk();
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} else {
|
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if (stat(argv[0], &sb) == 0) {
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/* OK, full pathname given */
|
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disk = argv[0];
|
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} else if (errno == ENOENT && argv[0][0] != '/') {
|
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/* Try prepending "/dev" */
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asprintf(&disk, "%s%s", _PATH_DEV, argv[0]);
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if (disk == NULL)
|
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errx(1, "out of memory");
|
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} else {
|
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/* other stat error, let it fail below */
|
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disk = argv[0];
|
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}
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}
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if (open_disk(u_flag) < 0)
|
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err(1, "cannot open disk %s", disk);
|
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|
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/* (abu)use mboot.bootinst to probe for the sector size */
|
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if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
|
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err(1, "cannot allocate buffer to determine disk sector size");
|
||
read_disk(0, mboot.bootinst);
|
||
free(mboot.bootinst);
|
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mboot.bootinst = NULL;
|
||
|
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if (s_flag) {
|
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if (read_s0())
|
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err(1, "read_s0");
|
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printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
|
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dos_sectors);
|
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printf("Part %11s %11s Type Flags\n", "Start", "Size");
|
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for (i = 0; i < NDOSPART; i++) {
|
||
partp = ((struct dos_partition *) &mboot.parts) + i;
|
||
if (partp->dp_start == 0 && partp->dp_size == 0)
|
||
continue;
|
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printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
|
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(u_long) partp->dp_start,
|
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(u_long) partp->dp_size, partp->dp_typ,
|
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partp->dp_flag);
|
||
}
|
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exit(0);
|
||
}
|
||
|
||
printf("******* Working on device %s *******\n",disk);
|
||
|
||
if (I_flag) {
|
||
read_s0();
|
||
reset_boot();
|
||
partp = (struct dos_partition *) (&mboot.parts[0]);
|
||
partp->dp_typ = DOSPTYP_386BSD;
|
||
partp->dp_flag = ACTIVE;
|
||
partp->dp_start = dos_sectors;
|
||
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs -
|
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dos_sectors;
|
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dos(partp);
|
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if (v_flag)
|
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print_s0(-1);
|
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if (!t_flag)
|
||
write_s0();
|
||
exit(0);
|
||
}
|
||
if (f_flag) {
|
||
if (read_s0() || i_flag)
|
||
reset_boot();
|
||
if (!read_config(f_flag))
|
||
exit(1);
|
||
if (v_flag)
|
||
print_s0(-1);
|
||
if (!t_flag)
|
||
write_s0();
|
||
} else {
|
||
if(u_flag)
|
||
get_params_to_use();
|
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else
|
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print_params();
|
||
|
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if (read_s0())
|
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init_sector0(dos_sectors);
|
||
|
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printf("Media sector size is %d\n", secsize);
|
||
printf("Warning: BIOS sector numbering starts with sector 1\n");
|
||
printf("Information from DOS bootblock is:\n");
|
||
if (partition == -1)
|
||
for (i = 1; i <= NDOSPART; i++)
|
||
change_part(i);
|
||
else
|
||
change_part(partition);
|
||
|
||
if (u_flag || a_flag)
|
||
change_active(partition);
|
||
|
||
if (B_flag)
|
||
change_code();
|
||
|
||
if (u_flag || a_flag || B_flag) {
|
||
if (!t_flag) {
|
||
printf("\nWe haven't changed the partition table yet. ");
|
||
printf("This is your last chance.\n");
|
||
}
|
||
print_s0(-1);
|
||
if (!t_flag) {
|
||
if (ok("Should we write new partition table?"))
|
||
write_s0();
|
||
} else {
|
||
printf("\n-t flag specified -- partition table not written.\n");
|
||
}
|
||
}
|
||
}
|
||
|
||
exit(0);
|
||
}
|
||
|
||
static void
|
||
usage()
|
||
{
|
||
fprintf(stderr, "%s%s",
|
||
"usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n",
|
||
" fdisk -f configfile [-itv] [disk]\n");
|
||
exit(1);
|
||
}
|
||
|
||
static void
|
||
print_s0(int which)
|
||
{
|
||
int i;
|
||
|
||
print_params();
|
||
printf("Information from DOS bootblock is:\n");
|
||
if (which == -1)
|
||
for (i = 1; i <= NDOSPART; i++)
|
||
printf("%d: ", i), print_part(i);
|
||
else
|
||
print_part(which);
|
||
}
|
||
|
||
static struct dos_partition mtpart;
|
||
|
||
static void
|
||
print_part(int i)
|
||
{
|
||
struct dos_partition *partp;
|
||
u_int64_t part_mb;
|
||
|
||
partp = ((struct dos_partition *) &mboot.parts) + i - 1;
|
||
|
||
if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
|
||
printf("<UNUSED>\n");
|
||
return;
|
||
}
|
||
/*
|
||
* Be careful not to overflow.
|
||
*/
|
||
part_mb = partp->dp_size;
|
||
part_mb *= secsize;
|
||
part_mb /= (1024 * 1024);
|
||
printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
|
||
get_type(partp->dp_typ));
|
||
printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
|
||
(u_long)partp->dp_start,
|
||
(u_long)partp->dp_size,
|
||
(uintmax_t)part_mb,
|
||
partp->dp_flag,
|
||
partp->dp_flag == ACTIVE ? " (active)" : "");
|
||
printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
|
||
,DPCYL(partp->dp_scyl, partp->dp_ssect)
|
||
,partp->dp_shd
|
||
,DPSECT(partp->dp_ssect)
|
||
,DPCYL(partp->dp_ecyl, partp->dp_esect)
|
||
,partp->dp_ehd
|
||
,DPSECT(partp->dp_esect));
|
||
}
|
||
|
||
|
||
static void
|
||
init_boot(void)
|
||
{
|
||
#ifndef __ia64__
|
||
const char *fname;
|
||
int fdesc, n;
|
||
struct stat sb;
|
||
|
||
fname = b_flag ? b_flag : "/boot/mbr";
|
||
if ((fdesc = open(fname, O_RDONLY)) == -1 ||
|
||
fstat(fdesc, &sb) == -1)
|
||
err(1, "%s", fname);
|
||
if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
|
||
errx(1, "%s: length must be a multiple of sector size", fname);
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
|
||
errx(1, "%s: unable to allocate read buffer", fname);
|
||
if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
|
||
close(fdesc))
|
||
err(1, "%s", fname);
|
||
if (n != mboot.bootinst_size)
|
||
errx(1, "%s: short read", fname);
|
||
#else
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
mboot.bootinst_size = secsize;
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL)
|
||
errx(1, "unable to allocate boot block buffer");
|
||
memset(mboot.bootinst, 0, mboot.bootinst_size);
|
||
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
|
||
#endif
|
||
}
|
||
|
||
|
||
static void
|
||
init_sector0(unsigned long start)
|
||
{
|
||
struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]);
|
||
|
||
init_boot();
|
||
|
||
partp->dp_typ = DOSPTYP_386BSD;
|
||
partp->dp_flag = ACTIVE;
|
||
start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors;
|
||
if(start == 0)
|
||
start = dos_sectors;
|
||
partp->dp_start = start;
|
||
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start;
|
||
|
||
dos(partp);
|
||
}
|
||
|
||
static void
|
||
change_part(int i)
|
||
{
|
||
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
|
||
|
||
printf("The data for partition %d is:\n", i);
|
||
print_part(i);
|
||
|
||
if (u_flag && ok("Do you want to change it?")) {
|
||
int tmp;
|
||
|
||
if (i_flag) {
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
if (i == 1) {
|
||
init_sector0(1);
|
||
printf("\nThe static data for the slice 1 has been reinitialized to:\n");
|
||
print_part(i);
|
||
}
|
||
}
|
||
|
||
do {
|
||
Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp);
|
||
Decimal("start", partp->dp_start, tmp);
|
||
Decimal("size", partp->dp_size, tmp);
|
||
if (!sanitize_partition(partp)) {
|
||
warnx("ERROR: failed to adjust; setting sysid to 0");
|
||
partp->dp_typ = 0;
|
||
}
|
||
|
||
if (ok("Explicitly specify beg/end address ?"))
|
||
{
|
||
int tsec,tcyl,thd;
|
||
tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
|
||
thd = partp->dp_shd;
|
||
tsec = DPSECT(partp->dp_ssect);
|
||
Decimal("beginning cylinder", tcyl, tmp);
|
||
Decimal("beginning head", thd, tmp);
|
||
Decimal("beginning sector", tsec, tmp);
|
||
partp->dp_scyl = DOSCYL(tcyl);
|
||
partp->dp_ssect = DOSSECT(tsec,tcyl);
|
||
partp->dp_shd = thd;
|
||
|
||
tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
|
||
thd = partp->dp_ehd;
|
||
tsec = DPSECT(partp->dp_esect);
|
||
Decimal("ending cylinder", tcyl, tmp);
|
||
Decimal("ending head", thd, tmp);
|
||
Decimal("ending sector", tsec, tmp);
|
||
partp->dp_ecyl = DOSCYL(tcyl);
|
||
partp->dp_esect = DOSSECT(tsec,tcyl);
|
||
partp->dp_ehd = thd;
|
||
} else
|
||
dos(partp);
|
||
|
||
print_part(i);
|
||
} while (!ok("Are we happy with this entry?"));
|
||
}
|
||
}
|
||
|
||
static void
|
||
print_params()
|
||
{
|
||
printf("parameters extracted from in-core disklabel are:\n");
|
||
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
|
||
,cyls,heads,sectors,cylsecs);
|
||
if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
|
||
printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
|
||
printf("parameters to be used for BIOS calculations are:\n");
|
||
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
|
||
,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
|
||
}
|
||
|
||
static void
|
||
change_active(int which)
|
||
{
|
||
struct dos_partition *partp = &mboot.parts[0];
|
||
int active, i, new, tmp;
|
||
|
||
active = -1;
|
||
for (i = 0; i < NDOSPART; i++) {
|
||
if ((partp[i].dp_flag & ACTIVE) == 0)
|
||
continue;
|
||
printf("Partition %d is marked active\n", i + 1);
|
||
if (active == -1)
|
||
active = i + 1;
|
||
}
|
||
if (a_flag && which != -1)
|
||
active = which;
|
||
else if (active == -1)
|
||
active = 1;
|
||
|
||
if (!ok("Do you want to change the active partition?"))
|
||
return;
|
||
setactive:
|
||
do {
|
||
new = active;
|
||
Decimal("active partition", new, tmp);
|
||
if (new < 1 || new > 4) {
|
||
printf("Active partition number must be in range 1-4."
|
||
" Try again.\n");
|
||
goto setactive;
|
||
}
|
||
active = new;
|
||
} while (!ok("Are you happy with this choice"));
|
||
for (i = 0; i < NDOSPART; i++)
|
||
partp[i].dp_flag = 0;
|
||
if (active > 0 && active <= NDOSPART)
|
||
partp[active-1].dp_flag = ACTIVE;
|
||
}
|
||
|
||
static void
|
||
change_code()
|
||
{
|
||
if (ok("Do you want to change the boot code?"))
|
||
init_boot();
|
||
}
|
||
|
||
void
|
||
get_params_to_use()
|
||
{
|
||
int tmp;
|
||
print_params();
|
||
if (ok("Do you want to change our idea of what BIOS thinks ?"))
|
||
{
|
||
do
|
||
{
|
||
Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
|
||
Decimal("BIOS's idea of #heads", dos_heads, tmp);
|
||
Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
|
||
dos_cylsecs = dos_heads * dos_sectors;
|
||
print_params();
|
||
}
|
||
while(!ok("Are you happy with this choice"));
|
||
}
|
||
}
|
||
|
||
|
||
/***********************************************\
|
||
* Change real numbers into strange dos numbers *
|
||
\***********************************************/
|
||
static void
|
||
dos(struct dos_partition *partp)
|
||
{
|
||
int cy, sec;
|
||
u_int32_t end;
|
||
|
||
if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
|
||
memcpy(partp, &mtpart, sizeof(*partp));
|
||
return;
|
||
}
|
||
|
||
/* Start c/h/s. */
|
||
partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
|
||
cy = partp->dp_start / dos_cylsecs;
|
||
sec = partp->dp_start % dos_sectors + 1;
|
||
partp->dp_scyl = DOSCYL(cy);
|
||
partp->dp_ssect = DOSSECT(sec, cy);
|
||
|
||
/* End c/h/s. */
|
||
end = partp->dp_start + partp->dp_size - 1;
|
||
partp->dp_ehd = end % dos_cylsecs / dos_sectors;
|
||
cy = end / dos_cylsecs;
|
||
sec = end % dos_sectors + 1;
|
||
partp->dp_ecyl = DOSCYL(cy);
|
||
partp->dp_esect = DOSSECT(sec, cy);
|
||
}
|
||
|
||
static int
|
||
open_disk(int flag)
|
||
{
|
||
struct stat st;
|
||
int rwmode;
|
||
|
||
if (stat(disk, &st) == -1) {
|
||
if (errno == ENOENT)
|
||
return -2;
|
||
warnx("can't get file status of %s", disk);
|
||
return -1;
|
||
}
|
||
if ( !(st.st_mode & S_IFCHR) )
|
||
warnx("device %s is not character special", disk);
|
||
rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY;
|
||
fd = open(disk, rwmode);
|
||
if (fd == -1 && errno == EPERM && rwmode == O_RDWR)
|
||
fd = open(disk, O_RDONLY);
|
||
if (fd == -1 && errno == ENXIO)
|
||
return -2;
|
||
if (fd == -1) {
|
||
warnx("can't open device %s", disk);
|
||
return -1;
|
||
}
|
||
if (get_params() == -1) {
|
||
warnx("can't get disk parameters on %s", disk);
|
||
return -1;
|
||
}
|
||
return fd;
|
||
}
|
||
|
||
static ssize_t
|
||
read_disk(off_t sector, void *buf)
|
||
{
|
||
|
||
lseek(fd, (sector * 512), 0);
|
||
if (secsize == 0)
|
||
for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
|
||
secsize *= 2) {
|
||
/* try the read */
|
||
int size = read(fd, buf, secsize);
|
||
if (size == secsize)
|
||
/* it worked so return */
|
||
return secsize;
|
||
}
|
||
else
|
||
return read(fd, buf, secsize);
|
||
|
||
/* we failed to read at any of the sizes */
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
write_disk(off_t sector, void *buf)
|
||
{
|
||
int error;
|
||
struct gctl_req *grq;
|
||
const char *q;
|
||
char fbuf[BUFSIZ];
|
||
int i, fdw;
|
||
|
||
grq = gctl_get_handle();
|
||
gctl_ro_param(grq, "verb", -1, "write MBR");
|
||
gctl_ro_param(grq, "class", -1, "MBR");
|
||
q = strrchr(disk, '/');
|
||
if (q == NULL)
|
||
q = disk;
|
||
else
|
||
q++;
|
||
gctl_ro_param(grq, "geom", -1, q);
|
||
gctl_ro_param(grq, "data", secsize, buf);
|
||
q = gctl_issue(grq);
|
||
if (q == NULL)
|
||
return(0);
|
||
warnx("%s", q);
|
||
|
||
error = pwrite(fd, buf, secsize, (sector * 512));
|
||
if (error == secsize)
|
||
return (0);
|
||
|
||
for (i = 1; i < 5; i++) {
|
||
sprintf(fbuf, "%ss%d", disk, i);
|
||
fdw = open(fbuf, O_RDWR, 0);
|
||
if (fdw < 0)
|
||
continue;
|
||
error = ioctl(fdw, DIOCSMBR, buf);
|
||
close(fdw);
|
||
if (error == 0)
|
||
return (0);
|
||
}
|
||
warnx("Failed to write sector zero");
|
||
return(EINVAL);
|
||
}
|
||
|
||
static int
|
||
get_params()
|
||
{
|
||
int error;
|
||
u_int u;
|
||
off_t o;
|
||
|
||
error = ioctl(fd, DIOCGFWSECTORS, &u);
|
||
if (error == 0)
|
||
sectors = dos_sectors = u;
|
||
else
|
||
sectors = dos_sectors = 63;
|
||
|
||
error = ioctl(fd, DIOCGFWHEADS, &u);
|
||
if (error == 0)
|
||
heads = dos_heads = u;
|
||
else
|
||
heads = dos_heads = 255;
|
||
|
||
dos_cylsecs = cylsecs = heads * sectors;
|
||
disksecs = cyls * heads * sectors;
|
||
|
||
error = ioctl(fd, DIOCGSECTORSIZE, &u);
|
||
if (error != 0 || u == 0)
|
||
u = 512;
|
||
|
||
error = ioctl(fd, DIOCGMEDIASIZE, &o);
|
||
if (error == 0) {
|
||
disksecs = o / u;
|
||
cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
|
||
}
|
||
|
||
return (disksecs);
|
||
}
|
||
|
||
|
||
static int
|
||
read_s0()
|
||
{
|
||
int i;
|
||
|
||
mboot.bootinst_size = secsize;
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
|
||
warnx("unable to allocate buffer to read fdisk "
|
||
"partition table");
|
||
return -1;
|
||
}
|
||
if (read_disk(0, mboot.bootinst) == -1) {
|
||
warnx("can't read fdisk partition table");
|
||
return -1;
|
||
}
|
||
if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
|
||
warnx("invalid fdisk partition table found");
|
||
/* So should we initialize things */
|
||
return -1;
|
||
}
|
||
for (i = 0; i < NDOSPART; i++)
|
||
dos_partition_dec(
|
||
&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
|
||
&mboot.parts[i]);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
write_s0()
|
||
{
|
||
int sector, i;
|
||
|
||
if (iotest) {
|
||
print_s0(-1);
|
||
return 0;
|
||
}
|
||
for(i = 0; i < NDOSPART; i++)
|
||
dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
|
||
&mboot.parts[i]);
|
||
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
|
||
for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
|
||
if (write_disk(sector,
|
||
&mboot.bootinst[sector * secsize]) == -1) {
|
||
warn("can't write fdisk partition table");
|
||
return -1;
|
||
}
|
||
return(0);
|
||
}
|
||
|
||
|
||
static int
|
||
ok(const char *str)
|
||
{
|
||
printf("%s [n] ", str);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (*lbuf &&
|
||
(!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
|
||
!strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
decimal(const char *str, int *num, int deflt)
|
||
{
|
||
int acc = 0, c;
|
||
char *cp;
|
||
|
||
while (1) {
|
||
printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (!*lbuf)
|
||
return 0;
|
||
|
||
cp = lbuf;
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c)
|
||
return 0;
|
||
while ((c = *cp++)) {
|
||
if (c <= '9' && c >= '0')
|
||
acc = acc * 10 + c - '0';
|
||
else
|
||
break;
|
||
}
|
||
if (c == ' ' || c == '\t')
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c) {
|
||
*num = acc;
|
||
return 1;
|
||
} else
|
||
printf("%s is an invalid decimal number. Try again.\n",
|
||
lbuf);
|
||
}
|
||
|
||
}
|
||
|
||
static const char *
|
||
get_type(int type)
|
||
{
|
||
int numentries = (sizeof(part_types)/sizeof(struct part_type));
|
||
int counter = 0;
|
||
struct part_type *ptr = part_types;
|
||
|
||
|
||
while(counter < numentries) {
|
||
if(ptr->type == type)
|
||
return(ptr->name);
|
||
ptr++;
|
||
counter++;
|
||
}
|
||
return("unknown");
|
||
}
|
||
|
||
|
||
static void
|
||
parse_config_line(char *line, CMD *command)
|
||
{
|
||
char *cp, *end;
|
||
|
||
cp = line;
|
||
while (1) {
|
||
memset(command, 0, sizeof(*command));
|
||
|
||
while (isspace(*cp)) ++cp;
|
||
if (*cp == '\0' || *cp == '#')
|
||
break;
|
||
command->cmd = *cp++;
|
||
|
||
/*
|
||
* Parse args
|
||
*/
|
||
while (1) {
|
||
while (isspace(*cp)) ++cp;
|
||
if (*cp == '#')
|
||
break; /* found comment */
|
||
if (isalpha(*cp))
|
||
command->args[command->n_args].argtype = *cp++;
|
||
if (!isdigit(*cp))
|
||
break; /* assume end of line */
|
||
end = NULL;
|
||
command->args[command->n_args].arg_val = strtol(cp, &end, 0);
|
||
if (cp == end)
|
||
break; /* couldn't parse number */
|
||
cp = end;
|
||
command->n_args++;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
static int
|
||
process_geometry(CMD *command)
|
||
{
|
||
int status = 1, i;
|
||
|
||
while (1) {
|
||
geom_processed = 1;
|
||
if (part_processed) {
|
||
warnx(
|
||
"ERROR line %d: the geometry specification line must occur before\n\
|
||
all partition specifications",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
if (command->n_args != 3) {
|
||
warnx("ERROR line %d: incorrect number of geometry args",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
dos_cyls = 0;
|
||
dos_heads = 0;
|
||
dos_sectors = 0;
|
||
for (i = 0; i < 3; ++i) {
|
||
switch (command->args[i].argtype) {
|
||
case 'c':
|
||
dos_cyls = command->args[i].arg_val;
|
||
break;
|
||
case 'h':
|
||
dos_heads = command->args[i].arg_val;
|
||
break;
|
||
case 's':
|
||
dos_sectors = command->args[i].arg_val;
|
||
break;
|
||
default:
|
||
warnx(
|
||
"ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
|
||
current_line_number, command->args[i].argtype,
|
||
command->args[i].argtype);
|
||
status = 0;
|
||
break;
|
||
}
|
||
}
|
||
if (status == 0)
|
||
break;
|
||
|
||
dos_cylsecs = dos_heads * dos_sectors;
|
||
|
||
/*
|
||
* Do sanity checks on parameter values
|
||
*/
|
||
if (dos_cyls == 0) {
|
||
warnx("ERROR line %d: number of cylinders not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
if (dos_cyls > 1024) {
|
||
warnx(
|
||
"WARNING line %d: number of cylinders (%d) may be out-of-range\n\
|
||
(must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
|
||
is dedicated to FreeBSD)",
|
||
current_line_number, dos_cyls);
|
||
}
|
||
|
||
if (dos_heads == 0) {
|
||
warnx("ERROR line %d: number of heads not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
} else if (dos_heads > 256) {
|
||
warnx("ERROR line %d: number of heads must be within (1-256)",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
|
||
if (dos_sectors == 0) {
|
||
warnx("ERROR line %d: number of sectors not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
} else if (dos_sectors > 63) {
|
||
warnx("ERROR line %d: number of sectors must be within (1-63)",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_partition(CMD *command)
|
||
{
|
||
int status = 0, partition;
|
||
u_int32_t prev_head_boundary, prev_cyl_boundary;
|
||
u_int32_t adj_size, max_end;
|
||
struct dos_partition *partp;
|
||
|
||
while (1) {
|
||
part_processed = 1;
|
||
if (command->n_args != 4) {
|
||
warnx("ERROR line %d: incorrect number of partition args",
|
||
current_line_number);
|
||
break;
|
||
}
|
||
partition = command->args[0].arg_val;
|
||
if (partition < 1 || partition > 4) {
|
||
warnx("ERROR line %d: invalid partition number %d",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
partp->dp_typ = command->args[1].arg_val;
|
||
partp->dp_start = command->args[2].arg_val;
|
||
partp->dp_size = command->args[3].arg_val;
|
||
max_end = partp->dp_start + partp->dp_size;
|
||
|
||
if (partp->dp_typ == 0) {
|
||
/*
|
||
* Get out, the partition is marked as unused.
|
||
*/
|
||
/*
|
||
* Insure that it's unused.
|
||
*/
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
status = 1;
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Adjust start upwards, if necessary, to fall on a head boundary.
|
||
*/
|
||
if (partp->dp_start % dos_sectors != 0) {
|
||
prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors;
|
||
if (max_end < dos_sectors ||
|
||
prev_head_boundary > max_end - dos_sectors) {
|
||
/*
|
||
* Can't go past end of partition
|
||
*/
|
||
warnx(
|
||
"ERROR line %d: unable to adjust start of partition %d to fall on\n\
|
||
a head boundary",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
warnx(
|
||
"WARNING: adjusting start offset of partition %d\n\
|
||
from %u to %u, to fall on a head boundary",
|
||
partition, (u_int)partp->dp_start,
|
||
(u_int)(prev_head_boundary + dos_sectors));
|
||
partp->dp_start = prev_head_boundary + dos_sectors;
|
||
}
|
||
|
||
/*
|
||
* Adjust size downwards, if necessary, to fall on a cylinder
|
||
* boundary.
|
||
*/
|
||
prev_cyl_boundary =
|
||
((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
|
||
if (prev_cyl_boundary > partp->dp_start)
|
||
adj_size = prev_cyl_boundary - partp->dp_start;
|
||
else {
|
||
warnx(
|
||
"ERROR: could not adjust partition to start on a head boundary\n\
|
||
and end on a cylinder boundary.");
|
||
return (0);
|
||
}
|
||
if (adj_size != partp->dp_size) {
|
||
warnx(
|
||
"WARNING: adjusting size of partition %d from %u to %u\n\
|
||
to end on a cylinder boundary",
|
||
partition, (u_int)partp->dp_size, (u_int)adj_size);
|
||
partp->dp_size = adj_size;
|
||
}
|
||
if (partp->dp_size == 0) {
|
||
warnx("ERROR line %d: size of partition %d is zero",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
|
||
dos(partp);
|
||
status = 1;
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_active(CMD *command)
|
||
{
|
||
int status = 0, partition, i;
|
||
struct dos_partition *partp;
|
||
|
||
while (1) {
|
||
active_processed = 1;
|
||
if (command->n_args != 1) {
|
||
warnx("ERROR line %d: incorrect number of active args",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
partition = command->args[0].arg_val;
|
||
if (partition < 1 || partition > 4) {
|
||
warnx("ERROR line %d: invalid partition number %d",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
/*
|
||
* Reset active partition
|
||
*/
|
||
partp = ((struct dos_partition *) &mboot.parts);
|
||
for (i = 0; i < NDOSPART; i++)
|
||
partp[i].dp_flag = 0;
|
||
partp[partition-1].dp_flag = ACTIVE;
|
||
|
||
status = 1;
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_line(char *line)
|
||
{
|
||
CMD command;
|
||
int status = 1;
|
||
|
||
while (1) {
|
||
parse_config_line(line, &command);
|
||
switch (command.cmd) {
|
||
case 0:
|
||
/*
|
||
* Comment or blank line
|
||
*/
|
||
break;
|
||
case 'g':
|
||
/*
|
||
* Set geometry
|
||
*/
|
||
status = process_geometry(&command);
|
||
break;
|
||
case 'p':
|
||
status = process_partition(&command);
|
||
break;
|
||
case 'a':
|
||
status = process_active(&command);
|
||
break;
|
||
default:
|
||
status = 0;
|
||
break;
|
||
}
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
read_config(char *config_file)
|
||
{
|
||
FILE *fp = NULL;
|
||
int status = 1;
|
||
char buf[1010];
|
||
|
||
while (1) {
|
||
if (strcmp(config_file, "-") != 0) {
|
||
/*
|
||
* We're not reading from stdin
|
||
*/
|
||
if ((fp = fopen(config_file, "r")) == NULL) {
|
||
status = 0;
|
||
break;
|
||
}
|
||
} else {
|
||
fp = stdin;
|
||
}
|
||
current_line_number = 0;
|
||
while (!feof(fp)) {
|
||
if (fgets(buf, sizeof(buf), fp) == NULL)
|
||
break;
|
||
++current_line_number;
|
||
status = process_line(buf);
|
||
if (status == 0)
|
||
break;
|
||
}
|
||
break;
|
||
}
|
||
if (fp) {
|
||
/*
|
||
* It doesn't matter if we're reading from stdin, as we've reached EOF
|
||
*/
|
||
fclose(fp);
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static void
|
||
reset_boot(void)
|
||
{
|
||
int i;
|
||
struct dos_partition *partp;
|
||
|
||
init_boot();
|
||
for (i = 0; i < 4; ++i) {
|
||
partp = ((struct dos_partition *) &mboot.parts) + i;
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
}
|
||
}
|
||
|
||
static int
|
||
sanitize_partition(struct dos_partition *partp)
|
||
{
|
||
u_int32_t prev_head_boundary, prev_cyl_boundary;
|
||
u_int32_t max_end, size, start;
|
||
|
||
start = partp->dp_start;
|
||
size = partp->dp_size;
|
||
max_end = start + size;
|
||
/* Only allow a zero size if the partition is being marked unused. */
|
||
if (size == 0) {
|
||
if (start == 0 && partp->dp_typ == 0)
|
||
return (1);
|
||
warnx("ERROR: size of partition is zero");
|
||
return (0);
|
||
}
|
||
/* Return if no adjustment is necessary. */
|
||
if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
|
||
return (1);
|
||
|
||
if (start == 0) {
|
||
warnx("WARNING: partition overlaps with partition table");
|
||
if (ok("Correct this automatically?"))
|
||
start = dos_sectors;
|
||
}
|
||
if (start % dos_sectors != 0)
|
||
warnx("WARNING: partition does not start on a head boundary");
|
||
if ((start +size) % dos_sectors != 0)
|
||
warnx("WARNING: partition does not end on a cylinder boundary");
|
||
warnx("WARNING: this may confuse the BIOS or some operating systems");
|
||
if (!ok("Correct this automatically?"))
|
||
return (1);
|
||
|
||
/*
|
||
* Adjust start upwards, if necessary, to fall on a head boundary.
|
||
*/
|
||
if (start % dos_sectors != 0) {
|
||
prev_head_boundary = start / dos_sectors * dos_sectors;
|
||
if (max_end < dos_sectors ||
|
||
prev_head_boundary >= max_end - dos_sectors) {
|
||
/*
|
||
* Can't go past end of partition
|
||
*/
|
||
warnx(
|
||
"ERROR: unable to adjust start of partition to fall on a head boundary");
|
||
return (0);
|
||
}
|
||
start = prev_head_boundary + dos_sectors;
|
||
}
|
||
|
||
/*
|
||
* Adjust size downwards, if necessary, to fall on a cylinder
|
||
* boundary.
|
||
*/
|
||
prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs;
|
||
if (prev_cyl_boundary > start)
|
||
size = prev_cyl_boundary - start;
|
||
else {
|
||
warnx("ERROR: could not adjust partition to start on a head boundary\n\
|
||
and end on a cylinder boundary.");
|
||
return (0);
|
||
}
|
||
|
||
/* Finally, commit any changes to partp and return. */
|
||
if (start != partp->dp_start) {
|
||
warnx("WARNING: adjusting start offset of partition to %u",
|
||
(u_int)start);
|
||
partp->dp_start = start;
|
||
}
|
||
if (size != partp->dp_size) {
|
||
warnx("WARNING: adjusting size of partition to %u", (u_int)size);
|
||
partp->dp_size = size;
|
||
}
|
||
|
||
return (1);
|
||
}
|
||
|
||
/*
|
||
* Try figuring out the root device's canonical disk name.
|
||
* The following choices are considered:
|
||
* /dev/ad0s1a => /dev/ad0
|
||
* /dev/da0a => /dev/da0
|
||
* /dev/vinum/root => /dev/vinum/root
|
||
*/
|
||
static char *
|
||
get_rootdisk(void)
|
||
{
|
||
struct statfs rootfs;
|
||
regex_t re;
|
||
#define NMATCHES 2
|
||
regmatch_t rm[NMATCHES];
|
||
char *s;
|
||
int rv;
|
||
|
||
if (statfs("/", &rootfs) == -1)
|
||
err(1, "statfs(\"/\")");
|
||
|
||
if ((rv = regcomp(&re, "^(/dev/[a-z]+[0-9]+)([sp][0-9]+)?[a-h]?$",
|
||
REG_EXTENDED)) != 0)
|
||
errx(1, "regcomp() failed (%d)", rv);
|
||
if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0)
|
||
errx(1,
|
||
"mounted root fs resource doesn't match expectations (regexec returned %d)",
|
||
rv);
|
||
if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
|
||
errx(1, "out of memory");
|
||
memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
|
||
rm[1].rm_eo - rm[1].rm_so);
|
||
s[rm[1].rm_eo - rm[1].rm_so] = 0;
|
||
|
||
return s;
|
||
}
|