1 files changed, 675 insertions, 0 deletions

diff --git a/gpt/gpt.c b/gpt/gpt.c
new file mode 100644
index 000000000..068a24458
--- /dev/null
+++ b/gpt/gpt.c
@@ -0,0 +1,675 @@
+/*
+    gpt.[ch]
+
+    Copyright (C) 2000-2001 Dell Computer Corporation <Matt_Domsch@dell.com> 
+
+    EFI GUID Partition Table handling
+    Per Intel EFI Specification v1.02
+    http://developer.intel.com/technology/efi/efi.htm
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+// For TWRP purposes, we'll be opting for version 3 of the GPL
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/utsname.h>
+#include <asm/byteorder.h>
+#include "gpt.h"
+#include "gptcrc32.h"
+
+#define BLKGETLASTSECT  _IO(0x12,108) /* get last sector of block device */
+#define BLKGETSIZE _IO(0x12,96)	/* return device size */
+#define BLKSSZGET  _IO(0x12,104)	/* get block device sector size */
+#define BLKGETSIZE64 _IOR(0x12,114,uint64_t)	/* return device size in bytes (u64 *arg) */
+
+struct blkdev_ioctl_param {
+        unsigned int block;
+        size_t content_length;
+        char * block_contents;
+};
+
+static inline int
+efi_guidcmp(efi_guid_t left, efi_guid_t right)
+{
+	return memcmp(&left, &right, sizeof (efi_guid_t));
+}
+
+static int
+get_sector_size(int filedes)
+{
+	int rc, sector_size = 512;
+
+	rc = ioctl(filedes, BLKSSZGET, &sector_size);
+	if (rc)
+		sector_size = 512;
+	return sector_size;
+}
+
+/**
+ * efi_crc32() - EFI version of crc32 function
+ * @buf: buffer to calculate crc32 of
+ * @len - length of buf
+ *
+ * Description: Returns EFI-style CRC32 value for @buf
+ * 
+ * This function uses the little endian Ethernet polynomial
+ * but seeds the function with ~0, and xor's with ~0 at the end.
+ * Note, the EFI Specification, v1.02, has a reference to
+ * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
+ */
+static inline uint32_t
+efi_crc32(const void *buf, unsigned long len)
+{
+	return (gptcrc32(buf, len, ~0L) ^ ~0L);
+}
+
+/**
+ * is_pmbr_valid(): test Protective MBR for validity
+ * @mbr: pointer to a legacy mbr structure
+ *
+ * Description: Returns 1 if PMBR is valid, 0 otherwise.
+ * Validity depends on two things:
+ *  1) MSDOS signature is in the last two bytes of the MBR
+ *  2) One partition of type 0xEE is found
+ */
+static int
+is_pmbr_valid(legacy_mbr *mbr)
+{
+	int i, found = 0, signature = 0;
+	if (!mbr)
+		return 0;
+	signature = (__le16_to_cpu(mbr->signature) == MSDOS_MBR_SIGNATURE);
+	for (i = 0; signature && i < 4; i++) {
+		if (mbr->partition[i].os_type ==
+                    EFI_PMBR_OSTYPE_EFI_GPT) {
+			found = 1;
+			break;
+		}
+	}
+	return (signature && found);
+}
+
+/**
+ * kernel_has_blkgetsize64()
+ *
+ * Returns: 0 on false, 1 on true
+ * True means kernel is 2.4.x, x>=18, or
+ *                   is 2.5.x, x>4, or
+ *                   is > 2.5
+ */
+static int
+kernel_has_blkgetsize64(void)
+{
+        int major=0, minor=0, patch=0, parsed;
+        int rc;
+        struct utsname u;
+
+        memset(&u, 0, sizeof(u));
+        rc = uname(&u);
+        if (rc) return 0;
+
+        parsed = sscanf(u.release, "%d.%d.%d", &major, &minor, &patch);
+        if (parsed < 3) return 0;
+        if (major > 2) return 1;
+        if (major == 2 && minor > 5) return 1;
+        if (major == 2 && minor == 5 && patch >= 4) return 1;
+        if (major == 2 && minor == 4 && patch >= 18) return 1;
+        return 0;
+}
+
+
+/************************************************************
+ * _get_num_sectors
+ * Requires:
+ *  - filedes is an open file descriptor, suitable for reading
+ * Modifies: nothing
+ * Returns:
+ *  Last LBA value on success 
+ *  0 on error
+ *
+ * Try getting BLKGETSIZE64 and BLKSSZGET first,
+ * then BLKGETSIZE if necessary.
+ *  Kernels 2.4.15-2.4.18 and 2.5.0-2.5.3 have a broken BLKGETSIZE64
+ *  which returns the number of 512-byte sectors, not the size of
+ *  the disk in bytes. Fixed in kernels 2.4.18-pre8 and 2.5.4-pre3.
+ ************************************************************/
+static uint64_t
+_get_num_sectors(int filedes)
+{
+	unsigned long sectors=0;
+        uint64_t bytes=0;
+	int rc;
+        if (kernel_has_blkgetsize64()) {
+                rc = ioctl(filedes, BLKGETSIZE64, &bytes);
+                if (!rc)
+                        return bytes / get_sector_size(filedes);
+        }
+
+        rc = ioctl(filedes, BLKGETSIZE, &sectors);
+        if (rc)
+                return 0;
+        
+	return sectors;
+}
+
+/************************************************************
+ * last_lba(): return number of last logical block of device
+ * 
+ * @fd
+ * 
+ * Description: returns Last LBA value on success, 0 on error.
+ * Notes: The value st_blocks gives the size of the file
+ *        in 512-byte blocks, which is OK if
+ *        EFI_BLOCK_SIZE_SHIFT == 9.
+ ************************************************************/
+
+static uint64_t
+last_lba(int filedes)
+{
+	int rc;
+	uint64_t sectors = 0;
+	struct stat s;
+	memset(&s, 0, sizeof (s));
+	rc = fstat(filedes, &s);
+	if (rc == -1) {
+		fprintf(stderr, "last_lba() could not stat: %s\n",
+			strerror(errno));
+		return 0;
+	}
+
+	if (S_ISBLK(s.st_mode)) {
+		sectors = _get_num_sectors(filedes);
+	} else {
+		fprintf(stderr,
+			"last_lba(): I don't know how to handle files with mode %x\n",
+			s.st_mode);
+		sectors = 1;
+	}
+
+	return sectors - 1;
+}
+
+
+static ssize_t
+read_lastoddsector(int fd, uint64_t lba __unused, void *buffer, size_t count)
+{
+        int rc;
+        struct blkdev_ioctl_param ioctl_param;
+
+        if (!buffer) return 0; 
+
+        ioctl_param.block = 0; /* read the last sector */
+        ioctl_param.content_length = count;
+        ioctl_param.block_contents = buffer;
+
+        rc = ioctl(fd, BLKGETLASTSECT, &ioctl_param);
+        if (rc == -1) perror("read failed");
+
+        return !rc;
+}
+
+static ssize_t
+read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
+{
+	int sector_size = get_sector_size(fd);
+	off_t offset = lba * sector_size;
+        ssize_t bytesread;
+        void *aligned;
+        void *unaligned;
+
+        if (bytes % sector_size)
+                return EINVAL;
+
+	unaligned = malloc(bytes+sector_size-1);
+	aligned = (void *)
+		(((unsigned long)unaligned + sector_size - 1) &
+		 ~(unsigned long)(sector_size-1));
+	memset(aligned, 0, bytes);
+
+
+	lseek(fd, offset, SEEK_SET);
+	bytesread = read(fd, aligned, bytes);
+        memcpy(buffer, aligned, bytesread);
+        free(unaligned);
+
+        /* Kludge.  This is necessary to read/write the last
+           block of an odd-sized disk, until Linux 2.5.x kernel fixes.
+           This is only used by gpt.c, and only to read
+           one sector, so we don't have to be fancy.
+        */
+        if (!bytesread && !(last_lba(fd) & 1) && lba == last_lba(fd)) {
+                bytesread = read_lastoddsector(fd, lba, buffer, bytes);
+        }
+        return bytesread;
+}
+
+/**
+ * alloc_read_gpt_entries(): reads partition entries from disk
+ * @fd  is an open file descriptor to the whole disk
+ * @gpt is a buffer into which the GPT will be put  
+ * Description: Returns ptes on success,  NULL on error.
+ * Allocates space for PTEs based on information found in @gpt.
+ * Notes: remember to free pte when you're done!
+ */
+static gpt_entry *
+alloc_read_gpt_entries(int fd, gpt_header * gpt)
+{
+	gpt_entry *pte;
+        size_t count = __le32_to_cpu(gpt->num_partition_entries) *
+                __le32_to_cpu(gpt->sizeof_partition_entry);
+
+        if (!count) return NULL;
+
+	pte = (gpt_entry *)malloc(count);
+	if (!pte)
+		return NULL;
+	memset(pte, 0, count);
+
+	if (!read_lba(fd, __le64_to_cpu(gpt->partition_entry_lba), pte,
+                      count)) {
+		free(pte);
+		return NULL;
+	}
+	return pte;
+}
+
+/**
+ * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
+ * @fd  is an open file descriptor to the whole disk
+ * @lba is the Logical Block Address of the partition table
+ * 
+ * Description: returns GPT header on success, NULL on error.   Allocates
+ * and fills a GPT header starting at @ from @bdev.
+ * Note: remember to free gpt when finished with it.
+ */
+static gpt_header *
+alloc_read_gpt_header(int fd, uint64_t lba)
+{
+	gpt_header *gpt;
+	gpt = (gpt_header *)
+	    malloc(sizeof (gpt_header));
+	if (!gpt)
+		return NULL;
+	memset(gpt, 0, sizeof (*gpt));
+	if (!read_lba(fd, lba, gpt, sizeof (gpt_header))) {
+		free(gpt);
+		return NULL;
+	}
+
+	return gpt;
+}
+
+/**
+ * is_gpt_valid() - tests one GPT header and PTEs for validity
+ * @fd  is an open file descriptor to the whole disk
+ * @lba is the logical block address of the GPT header to test
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if valid,  0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ */
+static int
+is_gpt_valid(int fd, uint64_t lba,
+             gpt_header ** gpt, gpt_entry ** ptes)
+{
+	int rc = 0;		/* default to not valid */
+	uint32_t crc, origcrc;
+
+	if (!gpt || !ptes)
+                return 0;
+	if (!(*gpt = alloc_read_gpt_header(fd, lba)))
+		return 0;
+
+	/* Check the GUID Partition Table signature */
+	if (__le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
+		/* 
+		   printf("GUID Partition Table Header signature is wrong: %" PRIx64" != %" PRIx64 "\n",
+		   __le64_to_cpu((*gpt)->signature), GUID_PT_HEADER_SIGNATURE);
+		 */
+		free(*gpt);
+		*gpt = NULL;
+		return rc;
+	}
+
+	/* Check the GUID Partition Table Header CRC */
+	origcrc = __le32_to_cpu((*gpt)->header_crc32);
+	(*gpt)->header_crc32 = 0;
+	crc = efi_crc32(*gpt, __le32_to_cpu((*gpt)->header_size));
+	if (crc != origcrc) {
+		// printf( "GPTH CRC check failed, %x != %x.\n", origcrc, crc);
+		(*gpt)->header_crc32 = __cpu_to_le32(origcrc);
+		free(*gpt);
+		*gpt = NULL;
+		return 0;
+	}
+	(*gpt)->header_crc32 = __cpu_to_le32(origcrc);
+
+	/* Check that the my_lba entry points to the LBA
+	 * that contains the GPT we read */
+	if (__le64_to_cpu((*gpt)->my_lba) != lba) {
+		// printf( "my_lba % PRIx64 "x != lba %"PRIx64 "x.\n", __le64_to_cpu((*gpt)->my_lba), lba);
+		free(*gpt);
+		*gpt = NULL;
+		return 0;
+	}
+
+	if (!(*ptes = alloc_read_gpt_entries(fd, *gpt))) {
+		free(*gpt);
+		*gpt = NULL;
+		return 0;
+	}
+
+	/* Check the GUID Partition Entry Array CRC */
+	crc = efi_crc32(*ptes,
+                        __le32_to_cpu((*gpt)->num_partition_entries) *
+			__le32_to_cpu((*gpt)->sizeof_partition_entry));
+	if (crc != __le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
+		// printf("GUID Partitition Entry Array CRC check failed.\n");
+		free(*gpt);
+		*gpt = NULL;
+		free(*ptes);
+		*ptes = NULL;
+		return 0;
+	}
+
+	/* We're done, all's well */
+	return 1;
+}
+/**
+ * compare_gpts() - Search disk for valid GPT headers and PTEs
+ * @pgpt is the primary GPT header
+ * @agpt is the alternate GPT header
+ * @lastlba is the last LBA number
+ * Description: Returns nothing.  Sanity checks pgpt and agpt fields
+ * and prints warnings on discrepancies.
+ * 
+ */
+static void
+compare_gpts(gpt_header *pgpt, gpt_header *agpt, uint64_t lastlba)
+{
+	int error_found = 0;
+	if (!pgpt || !agpt)
+		return;
+	if (__le64_to_cpu(pgpt->my_lba) != __le64_to_cpu(agpt->alternate_lba)) {
+		fprintf(stderr, 
+		       "GPT:Primary header LBA != Alt. header alternate_lba\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(pgpt->my_lba),
+                       __le64_to_cpu(agpt->alternate_lba));
+		error_found++;
+	}
+	if (__le64_to_cpu(pgpt->alternate_lba) != __le64_to_cpu(agpt->my_lba)) {
+		fprintf(stderr, 
+		       "GPT:Primary header alternate_lba != Alt. header my_lba\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(pgpt->alternate_lba),
+                       __le64_to_cpu(agpt->my_lba));
+		error_found++;
+	}
+	if (__le64_to_cpu(pgpt->first_usable_lba) !=
+            __le64_to_cpu(agpt->first_usable_lba)) {
+		fprintf(stderr,  "GPT:first_usable_lbas don't match.\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(pgpt->first_usable_lba),
+                       __le64_to_cpu(agpt->first_usable_lba));
+		error_found++;
+	}
+	if (__le64_to_cpu(pgpt->last_usable_lba) !=
+            __le64_to_cpu(agpt->last_usable_lba)) {
+		fprintf(stderr,  "GPT:last_usable_lbas don't match.\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(pgpt->last_usable_lba),
+                       __le64_to_cpu(agpt->last_usable_lba));
+		error_found++;
+	}
+	if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
+		fprintf(stderr,  "GPT:disk_guids don't match.\n");
+		error_found++;
+	}
+	if (__le32_to_cpu(pgpt->num_partition_entries) !=
+            __le32_to_cpu(agpt->num_partition_entries)) {
+		fprintf(stderr,  "GPT:num_partition_entries don't match: "
+		       "0x%x != 0x%x\n",
+		       __le32_to_cpu(pgpt->num_partition_entries),
+		       __le32_to_cpu(agpt->num_partition_entries));
+		error_found++;
+	}
+	if (__le32_to_cpu(pgpt->sizeof_partition_entry) !=
+            __le32_to_cpu(agpt->sizeof_partition_entry)) {
+		fprintf(stderr, 
+		       "GPT:sizeof_partition_entry values don't match: "
+		       "0x%x != 0x%x\n",
+                       __le32_to_cpu(pgpt->sizeof_partition_entry),
+		       __le32_to_cpu(agpt->sizeof_partition_entry));
+		error_found++;
+	}
+	if (__le32_to_cpu(pgpt->partition_entry_array_crc32) !=
+            __le32_to_cpu(agpt->partition_entry_array_crc32)) {
+		fprintf(stderr, 
+		       "GPT:partition_entry_array_crc32 values don't match: "
+		       "0x%x != 0x%x\n",
+                       __le32_to_cpu(pgpt->partition_entry_array_crc32),
+		       __le32_to_cpu(agpt->partition_entry_array_crc32));
+		error_found++;
+	}
+	if (__le64_to_cpu(pgpt->alternate_lba) != lastlba) {
+		fprintf(stderr, 
+		       "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(pgpt->alternate_lba), lastlba);
+		error_found++;
+	}
+
+	if (__le64_to_cpu(agpt->my_lba) != lastlba) {
+		fprintf(stderr, 
+		       "GPT:Alternate GPT header not at the end of the disk.\n");
+		fprintf(stderr,  "GPT:0x%" PRIx64 " != 0x%" PRIx64 "\n",
+		       __le64_to_cpu(agpt->my_lba), lastlba);
+		error_found++;
+	}
+
+	if (error_found)
+		fprintf(stderr, 
+		       "GPT: Use GNU Parted to correct GPT errors.\n");
+	return;
+}
+
+/**
+ * find_valid_gpt() - Search disk for valid GPT headers and PTEs
+ * @fd  is an open file descriptor to the whole disk
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ * Description: Returns 1 if valid, 0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ * Validity depends on finding either the Primary GPT header and PTEs valid,
+ * or the Alternate GPT header and PTEs valid, and the PMBR valid.
+ */
+static int
+find_valid_gpt(int fd, gpt_header ** gpt, gpt_entry ** ptes)
+{
+	int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
+	gpt_header *pgpt = NULL, *agpt = NULL;
+	gpt_entry *pptes = NULL, *aptes = NULL;
+	legacy_mbr *legacymbr = NULL;
+	uint64_t lastlba;
+	if (!gpt || !ptes)
+		return 0;
+
+	lastlba = last_lba(fd);
+	good_pgpt = is_gpt_valid(fd, GPT_PRIMARY_PARTITION_TABLE_LBA,
+				 &pgpt, &pptes);
+        if (good_pgpt) {
+		good_agpt = is_gpt_valid(fd,
+                                         __le64_to_cpu(pgpt->alternate_lba),
+					 &agpt, &aptes);
+                if (!good_agpt) {
+                        good_agpt = is_gpt_valid(fd, lastlba,
+                                                 &agpt, &aptes);
+                }
+        }
+        else {
+                good_agpt = is_gpt_valid(fd, lastlba,
+                                         &agpt, &aptes);
+        }
+
+        /* The obviously unsuccessful case */
+        if (!good_pgpt && !good_agpt) {
+                goto fail;
+        }
+
+	/* This will be added to the EFI Spec. per Intel after v1.02. */
+        legacymbr = malloc(sizeof (*legacymbr));
+        if (legacymbr) {
+                memset(legacymbr, 0, sizeof (*legacymbr));
+                read_lba(fd, 0, (uint8_t *) legacymbr,
+                         sizeof (*legacymbr));
+                good_pmbr = is_pmbr_valid(legacymbr);
+                free(legacymbr);
+                legacymbr=NULL;
+        }
+
+        /* Failure due to bad PMBR */
+        if ((good_pgpt || good_agpt) && !good_pmbr) {
+                fprintf(stderr,
+                       "  Warning: Disk has a valid GPT signature "
+                       "but invalid PMBR.\n"
+                       "  Assuming this disk is *not* a GPT disk anymore.\n"
+                       "  Use gpt kernel option to override.  "
+                       "Use GNU Parted to correct disk.\n");
+                goto fail;
+        }
+
+        /* Would fail due to bad PMBR, but force GPT anyhow */
+        if ((good_pgpt || good_agpt) && !good_pmbr) {
+                fprintf(stderr, 
+                       "  Warning: Disk has a valid GPT signature but "
+                       "invalid PMBR.\n"
+                       "  Use GNU Parted to correct disk.\n"
+                       "  gpt option taken, disk treated as GPT.\n");
+        }
+
+        compare_gpts(pgpt, agpt, lastlba);
+
+        /* The good cases */
+        if (good_pgpt && (good_pmbr)) {
+                *gpt  = pgpt;
+                *ptes = pptes;
+                if (agpt)  { free(agpt);   agpt = NULL; }
+                if (aptes) { free(aptes); aptes = NULL; }
+                if (!good_agpt) {
+                        fprintf(stderr, 
+			       "Alternate GPT is invalid, "
+                               "using primary GPT.\n");
+                }
+                return 1;
+        }
+        else if (good_agpt && (good_pmbr)) {
+                *gpt  = agpt;
+                *ptes = aptes;
+                if (pgpt)  { free(pgpt);   pgpt = NULL; }
+                if (pptes) { free(pptes); pptes = NULL; }
+                fprintf(stderr, 
+                       "Primary GPT is invalid, using alternate GPT.\n");
+                return 1;
+        }
+
+ fail:
+        if (pgpt)  { free(pgpt);   pgpt=NULL; }
+        if (agpt)  { free(agpt);   agpt=NULL; }
+        if (pptes) { free(pptes); pptes=NULL; }
+        if (aptes) { free(aptes); aptes=NULL; }
+        *gpt = NULL;
+        *ptes = NULL;
+        return 0;
+}
+
+void guid_to_ascii(const char *guid, char *s)
+{
+	uint32_t p1;
+	uint16_t p2;
+	uint16_t p3;
+	unsigned char p4[8];
+
+	memcpy(&p1, guid + 0, 4);
+	memcpy(&p2, guid + 4, 2);
+	memcpy(&p3, guid + 6, 2);
+	memcpy(p4, guid + 8, 8);
+
+	sprintf(s, "%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x",
+		p1, p2, p3, p4[0], p4[1],
+		p4[2], p4[3], p4[4], p4[5], p4[6], p4[7]);
+}
+
+
+/************************************************************
+ * gpt_disk_get_partition_info()
+ * Requires:
+ *  - open file descriptor fd
+ *  - start, size, signature, mbr_type, signature_type
+ * Modifies: all these
+ * Returns:
+ *  0 on success
+ *  non-zero on failure
+ *
+ ************************************************************/
+int
+gpt_disk_get_partition_info(int fd, uint32_t num,
+			    char *type, char *part)
+{
+	gpt_header *gpt = NULL;
+	gpt_entry *ptes = NULL, *p;
+
+	if (!find_valid_gpt(fd, &gpt, &ptes))
+		return 1;
+
+	if (num > 0 && num <= __le32_to_cpu(gpt->num_partition_entries)) {
+		p = &ptes[num - 1];
+		guid_to_ascii((char*)&p->partition_type_guid, type);
+		guid_to_ascii((char*)&p->unique_partition_guid, part);
+	} else {
+		fprintf (stderr,"partition %d is not valid\n", num);
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: nil
+ * tab-width: 8
+ * End:
+ */