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-rw-r--r--fcp/src/cmd_trunc.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/fcp/src/cmd_trunc.c b/fcp/src/cmd_trunc.c
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+++ b/fcp/src/cmd_trunc.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) International Business Machines Corp., 2012
+ *
+ * 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
+ */
+
+/*
+ * File: cmd_trunc.c
+ * Author: Shaun Wetzstein <shaun@us.ibm.com>
+ * Descr: trunc implementation
+ * Date: 01/30/2013
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <fcntl.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <ctype.h>
+#include <regex.h>
+
+#include <clib/attribute.h>
+#include <clib/assert.h>
+#include <clib/list.h>
+#include <clib/list_iter.h>
+#include <clib/misc.h>
+#include <clib/min.h>
+#include <clib/err.h>
+#include <clib/raii.h>
+
+#include "misc.h"
+#include "main.h"
+
+static int __trunc(args_t * args, off_t offset)
+{
+ assert(args != NULL);
+
+ char * type = args->dst_type;
+ char * target = args->dst_target;
+ char * name = args->dst_name;
+
+ RAII(FILE*, file, __fopen(type, target, "r+", debug), fclose);
+ if (file == NULL)
+ return -1;
+ if (check_file(target, file, offset) < 0)
+ return -1;
+ RAII(ffs_t*, ffs, __ffs_fopen(file, offset), __ffs_fclose);
+ if (ffs == NULL)
+ return -1;
+
+ if (ffs->count <= 0)
+ return 0;
+
+ size_t block_size;
+ if (__ffs_info(ffs, FFS_INFO_BLOCK_SIZE, &block_size) < 0)
+ return -1;
+
+ if (args->buffer != NULL) {
+ size_t buffer;
+ if (parse_size(args->buffer, &buffer) < 0)
+ return -1;
+ if (__ffs_buffer(ffs, buffer) < 0)
+ return -1;
+ }
+
+ ffs_entry_t entry;
+ if (__ffs_entry_find(ffs, name, &entry) == false) {
+ UNEXPECTED("partition entry '%s' not found\n", name);
+ return -1;
+ }
+
+ char full_name[page_size];
+ if (__ffs_entry_name(ffs, &entry, full_name,
+ sizeof full_name) < 0)
+ return -1;
+
+ if (entry.type == FFS_TYPE_LOGICAL) {
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: logical (skip)\n",
+ offset, full_name);
+ return 0;
+ }
+
+ if (args->protected != f_PROTECTED &&
+ entry.flags && FFS_FLAGS_PROTECTED) {
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: protected (skip)\n",
+ offset, full_name);
+ return 0;
+ }
+
+ size_t size = 0;
+ if (args->opt_nr == 1) {
+ size = entry.size * block_size;
+ } else if (args->opt_nr == 2) {
+ if (parse_number(args->opt[1], &size) < 0)
+ return -1;
+ }
+
+ if (__ffs_entry_truncate(ffs, full_name, size) < 0) {
+ ERRNO(errno);
+ return -1;
+ }
+
+ if (args->verbose == f_VERBOSE)
+ fprintf(stderr, "%8llx: %s: truncate '%x' (done)\n",
+ offset, full_name, size);
+
+ return 0;
+}
+
+int command_trunc(args_t * args)
+{
+ assert(args != NULL);
+
+ int rc = 0;
+
+ char * end = (char *)args->offset;
+ while (rc == 0 && end != NULL && *end != '\0') {
+ errno = 0;
+ off_t offset = strtoull(end, &end, 0);
+ if (end == NULL || errno != 0) {
+ UNEXPECTED("invalid --offset specified '%s'",
+ args->offset);
+ return -1;
+ }
+
+ if (*end != ',' && *end != ':' && *end != '\0') {
+ UNEXPECTED("invalid --offset separator "
+ "character '%c'", *end);
+ return -1;
+ }
+
+ rc = __trunc(args, offset);
+ if (rc < 0)
+ break;
+
+ if (*end == '\0')
+ break;
+ end++;
+ }
+
+ return rc;
+}
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