diff --git a/updater/Android.mk b/updater/Android.mk
index a0ea06f..0d4179b 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -1,11 +1,23 @@
 # Copyright 2009 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 LOCAL_PATH := $(call my-dir)
 
 updater_src_files := \
-	install.c \
-	blockimg.c \
-	updater.c
+	install.cpp \
+	blockimg.cpp \
+	updater.cpp
 
 #
 # Build a statically-linked binary to include in OTA packages
diff --git a/updater/blockimg.c b/updater/blockimg.cpp
similarity index 98%
rename from updater/blockimg.c
rename to updater/blockimg.cpp
index e0be039..310bbf9 100644
--- a/updater/blockimg.c
+++ b/updater/blockimg.cpp
@@ -20,6 +20,7 @@
 #include <fcntl.h>
 #include <inttypes.h>
 #include <libgen.h>
+#include <linux/fs.h>
 #include <pthread.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -45,10 +46,6 @@
 // erase to mean fill the region with zeroes.
 #define DEBUG_ERASE  0
 
-#ifndef BLKDISCARD
-#define BLKDISCARD _IO(0x12,119)
-#endif
-
 #define STASH_DIRECTORY_BASE "/cache/recovery"
 #define STASH_DIRECTORY_MODE 0700
 #define STASH_FILE_MODE 0600
@@ -67,7 +64,7 @@
 static RangeSet* parse_range(char* text) {
     char* save;
     char* token;
-    int i, num;
+    int num;
     long int val;
     RangeSet* out = NULL;
     size_t bufsize;
@@ -93,7 +90,7 @@
     num = (int) val;
     bufsize = sizeof(RangeSet) + num * sizeof(int);
 
-    out = malloc(bufsize);
+    out = reinterpret_cast<RangeSet*>(malloc(bufsize));
 
     if (!out) {
         fprintf(stderr, "failed to allocate range of %zu bytes\n", bufsize);
@@ -103,7 +100,7 @@
     out->count = num / 2;
     out->size = 0;
 
-    for (i = 0; i < num; ++i) {
+    for (int i = 0; i < num; ++i) {
         token = strtok_r(NULL, ",", &save);
 
         if (!token) {
@@ -478,7 +475,7 @@
     }
 
     len = strlen(STASH_DIRECTORY_BASE) + 1 + strlen(base) + 1 + strlen(id) + strlen(postfix) + 1;
-    fn = malloc(len);
+    fn = reinterpret_cast<char*>(malloc(len));
 
     if (fn == NULL) {
         fprintf(stderr, "failed to malloc %d bytes for fn\n", len);
@@ -529,7 +526,7 @@
         }
 
         len = strlen(dirname) + 1 + strlen(item->d_name) + 1;
-        fn = malloc(len);
+        fn = reinterpret_cast<char*>(malloc(len));
 
         if (fn == NULL) {
             fprintf(stderr, "failed to malloc %d bytes for fn\n", len);
@@ -649,7 +646,8 @@
     fprintf(stderr, " loading %s\n", fn);
 
     if ((st.st_size % BLOCKSIZE) != 0) {
-        fprintf(stderr, "%s size %zd not multiple of block size %d", fn, st.st_size, BLOCKSIZE);
+        fprintf(stderr, "%s size %" PRId64 " not multiple of block size %d",
+                fn, static_cast<int64_t>(st.st_size), BLOCKSIZE);
         goto lsout;
     }
 
@@ -876,7 +874,6 @@
 static int SaveStash(const char* base, char** wordsave, uint8_t** buffer, size_t* buffer_alloc,
                       int fd, int usehash, int* isunresumable) {
     char *id = NULL;
-    int res = -1;
     int blocks = 0;
 
     if (!wordsave || !buffer || !buffer_alloc || !isunresumable) {
@@ -972,7 +969,6 @@
     char* word;
     char* colonsave;
     char* colon;
-    int id;
     int res;
     RangeSet* locs;
     size_t stashalloc = 0;
@@ -1088,7 +1084,6 @@
     char* srchash = NULL;
     char* tgthash = NULL;
     int stash_exists = 0;
-    int overlap_blocks = 0;
     int rc = -1;
     uint8_t* tgtbuffer = NULL;
 
@@ -1511,7 +1506,7 @@
     range = strtok_r(NULL, " ", &params->cpos);
 
     if (range == NULL) {
-        fprintf(stderr, "missing target blocks for zero\n");
+        fprintf(stderr, "missing target blocks for erase\n");
         goto pceout;
     }
 
@@ -1686,7 +1681,7 @@
 
     // The data in transfer_list_value is not necessarily null-terminated, so we need
     // to copy it to a new buffer and add the null that strtok_r will need.
-    transfer_list = malloc(transfer_list_value->size + 1);
+    transfer_list = reinterpret_cast<char*>(malloc(transfer_list_value->size + 1));
 
     if (transfer_list == NULL) {
         fprintf(stderr, "failed to allocate %zd bytes for transfer list\n",
@@ -1964,13 +1959,15 @@
         goto done;
     }
 
-    int fd = open(blockdev_filename->data, O_RDWR);
+    int fd;
+    fd = open(blockdev_filename->data, O_RDWR);
     if (fd < 0) {
         ErrorAbort(state, "open \"%s\" failed: %s", blockdev_filename->data, strerror(errno));
         goto done;
     }
 
-    RangeSet* rs = parse_range(ranges->data);
+    RangeSet* rs;
+    rs = parse_range(ranges->data);
     uint8_t buffer[BLOCKSIZE];
 
     SHA_CTX ctx;
diff --git a/updater/install.c b/updater/install.cpp
similarity index 92%
rename from updater/install.c
rename to updater/install.cpp
index 01a5dd2..a2bc402 100644
--- a/updater/install.c
+++ b/updater/install.cpp
@@ -75,9 +75,9 @@
 
 // Take a sha-1 digest and return it as a newly-allocated hex string.
 char* PrintSha1(const uint8_t* digest) {
-    char* buffer = malloc(SHA_DIGEST_SIZE*2 + 1);
-    int i;
+    char* buffer = reinterpret_cast<char*>(malloc(SHA_DIGEST_SIZE*2 + 1));
     const char* alphabet = "0123456789abcdef";
+    size_t i;
     for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
         buffer[i*2] = alphabet[(digest[i] >> 4) & 0xf];
         buffer[i*2+1] = alphabet[digest[i] & 0xf];
@@ -133,18 +133,20 @@
         goto done;
     }
 
-    char *secontext = NULL;
+    {
+        char *secontext = NULL;
 
-    if (sehandle) {
-        selabel_lookup(sehandle, &secontext, mount_point, 0755);
-        setfscreatecon(secontext);
-    }
+        if (sehandle) {
+            selabel_lookup(sehandle, &secontext, mount_point, 0755);
+            setfscreatecon(secontext);
+        }
 
-    mkdir(mount_point, 0755);
+        mkdir(mount_point, 0755);
 
-    if (secontext) {
-        freecon(secontext);
-        setfscreatecon(NULL);
+        if (secontext) {
+            freecon(secontext);
+            setfscreatecon(NULL);
+        }
     }
 
     if (strcmp(partition_type, "MTD") == 0) {
@@ -202,11 +204,13 @@
     }
 
     scan_mounted_volumes();
-    const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
-    if (vol == NULL) {
-        result = strdup("");
-    } else {
-        result = mount_point;
+    {
+        const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
+        if (vol == NULL) {
+            result = strdup("");
+        } else {
+            result = mount_point;
+        }
     }
 
 done:
@@ -230,17 +234,19 @@
     }
 
     scan_mounted_volumes();
-    const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
-    if (vol == NULL) {
-        uiPrintf(state, "unmount of %s failed; no such volume\n", mount_point);
-        result = strdup("");
-    } else {
-        int ret = unmount_mounted_volume(vol);
-        if (ret != 0) {
-           uiPrintf(state, "unmount of %s failed (%d): %s\n",
-                    mount_point, ret, strerror(errno));
+    {
+        const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
+        if (vol == NULL) {
+            uiPrintf(state, "unmount of %s failed; no such volume\n", mount_point);
+            result = strdup("");
+        } else {
+            int ret = unmount_mounted_volume(vol);
+            if (ret != 0) {
+                uiPrintf(state, "unmount of %s failed (%d): %s\n",
+                         mount_point, ret, strerror(errno));
+            }
+            result = mount_point;
         }
-        result = mount_point;
     }
 
 done:
@@ -413,9 +419,8 @@
 }
 
 Value* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
-    char** paths = malloc(argc * sizeof(char*));
-    int i;
-    for (i = 0; i < argc; ++i) {
+    char** paths = reinterpret_cast<char**>(malloc(argc * sizeof(char*)));
+    for (int i = 0; i < argc; ++i) {
         paths[i] = Evaluate(state, argv[i]);
         if (paths[i] == NULL) {
             int j;
@@ -430,7 +435,7 @@
     bool recursive = (strcmp(name, "delete_recursive") == 0);
 
     int success = 0;
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         if ((recursive ? dirUnlinkHierarchy(paths[i]) : unlink(paths[i])) == 0)
             ++success;
         free(paths[i]);
@@ -517,8 +522,6 @@
     }
     bool success = false;
 
-    UpdaterInfo* ui = (UpdaterInfo*)(state->cookie);
-
     if (argc == 2) {
         // The two-argument version extracts to a file.
 
@@ -534,14 +537,16 @@
             goto done2;
         }
 
-        FILE* f = fopen(dest_path, "wb");
-        if (f == NULL) {
-            printf("%s: can't open %s for write: %s\n",
-                    name, dest_path, strerror(errno));
-            goto done2;
+        {
+            FILE* f = fopen(dest_path, "wb");
+            if (f == NULL) {
+                printf("%s: can't open %s for write: %s\n",
+                        name, dest_path, strerror(errno));
+                goto done2;
+            }
+            success = mzExtractZipEntryToFile(za, entry, fileno(f));
+            fclose(f);
         }
-        success = mzExtractZipEntryToFile(za, entry, fileno(f));
-        fclose(f);
 
       done2:
         free(zip_path);
@@ -552,7 +557,7 @@
         // as the result.
 
         char* zip_path;
-        Value* v = malloc(sizeof(Value));
+        Value* v = reinterpret_cast<Value*>(malloc(sizeof(Value)));
         v->type = VAL_BLOB;
         v->size = -1;
         v->data = NULL;
@@ -567,7 +572,7 @@
         }
 
         v->size = mzGetZipEntryUncompLen(entry);
-        v->data = malloc(v->size);
+        v->data = reinterpret_cast<char*>(malloc(v->size));
         if (v->data == NULL) {
             printf("%s: failed to allocate %ld bytes for %s\n",
                     name, (long)v->size, zip_path);
@@ -866,17 +871,14 @@
 }
 
 static Value* SetMetadataFn(const char* name, State* state, int argc, Expr* argv[]) {
-    int i;
     int bad = 0;
-    static int nwarnings = 0;
     struct stat sb;
     Value* result = NULL;
 
     bool recursive = (strcmp(name, "set_metadata_recursive") == 0);
 
     if ((argc % 2) != 1) {
-        return ErrorAbort(state, "%s() expects an odd number of arguments, got %d",
-                          name, argc);
+        return ErrorAbort(state, "%s() expects an odd number of arguments, got %d", name, argc);
     }
 
     char** args = ReadVarArgs(state, argc, argv);
@@ -887,20 +889,22 @@
         goto done;
     }
 
-    struct perm_parsed_args parsed = ParsePermArgs(state, argc, args);
+    {
+        struct perm_parsed_args parsed = ParsePermArgs(state, argc, args);
 
-    if (recursive) {
-        recursive_parsed_args = parsed;
-        recursive_state = state;
-        bad += nftw(args[0], do_SetMetadataRecursive, 30, FTW_CHDIR | FTW_DEPTH | FTW_PHYS);
-        memset(&recursive_parsed_args, 0, sizeof(recursive_parsed_args));
-        recursive_state = NULL;
-    } else {
-        bad += ApplyParsedPerms(state, args[0], &sb, parsed);
+        if (recursive) {
+            recursive_parsed_args = parsed;
+            recursive_state = state;
+            bad += nftw(args[0], do_SetMetadataRecursive, 30, FTW_CHDIR | FTW_DEPTH | FTW_PHYS);
+            memset(&recursive_parsed_args, 0, sizeof(recursive_parsed_args));
+            recursive_state = NULL;
+        } else {
+            bad += ApplyParsedPerms(state, args[0], &sb, parsed);
+        }
     }
 
 done:
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         free(args[i]);
     }
     free(args);
@@ -920,8 +924,7 @@
     if (argc != 1) {
         return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
     }
-    char* key;
-    key = Evaluate(state, argv[0]);
+    char* key = Evaluate(state, argv[0]);
     if (key == NULL) return NULL;
 
     char value[PROPERTY_VALUE_MAX];
@@ -948,29 +951,27 @@
 
     struct stat st;
     if (stat(filename, &st) < 0) {
-        ErrorAbort(state, "%s: failed to stat \"%s\": %s",
-                   name, filename, strerror(errno));
+        ErrorAbort(state, "%s: failed to stat \"%s\": %s", name, filename, strerror(errno));
         goto done;
     }
 
 #define MAX_FILE_GETPROP_SIZE    65536
 
     if (st.st_size > MAX_FILE_GETPROP_SIZE) {
-        ErrorAbort(state, "%s too large for %s (max %d)",
-                   filename, name, MAX_FILE_GETPROP_SIZE);
+        ErrorAbort(state, "%s too large for %s (max %d)", filename, name, MAX_FILE_GETPROP_SIZE);
         goto done;
     }
 
-    buffer = malloc(st.st_size+1);
+    buffer = reinterpret_cast<char*>(malloc(st.st_size+1));
     if (buffer == NULL) {
         ErrorAbort(state, "%s: failed to alloc %lld bytes", name, (long long)st.st_size+1);
         goto done;
     }
 
-    FILE* f = fopen(filename, "rb");
+    FILE* f;
+    f = fopen(filename, "rb");
     if (f == NULL) {
-        ErrorAbort(state, "%s: failed to open %s: %s",
-                   name, filename, strerror(errno));
+        ErrorAbort(state, "%s: failed to open %s: %s", name, filename, strerror(errno));
         goto done;
     }
 
@@ -984,7 +985,8 @@
 
     fclose(f);
 
-    char* line = strtok(buffer, "\n");
+    char* line;
+    line = strtok(buffer, "\n");
     do {
         // skip whitespace at start of line
         while (*line && isspace(*line)) ++line;
@@ -1028,15 +1030,6 @@
     return StringValue(result);
 }
 
-
-static bool write_raw_image_cb(const unsigned char* data,
-                               int data_len, void* ctx) {
-    int r = mtd_write_data((MtdWriteContext*)ctx, (const char *)data, data_len);
-    if (r == data_len) return true;
-    printf("%s\n", strerror(errno));
-    return false;
-}
-
 // write_raw_image(filename_or_blob, partition)
 Value* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
     char* result = NULL;
@@ -1063,14 +1056,16 @@
     }
 
     mtd_scan_partitions();
-    const MtdPartition* mtd = mtd_find_partition_by_name(partition);
+    const MtdPartition* mtd;
+    mtd = mtd_find_partition_by_name(partition);
     if (mtd == NULL) {
         printf("%s: no mtd partition named \"%s\"\n", name, partition);
         result = strdup("");
         goto done;
     }
 
-    MtdWriteContext* ctx = mtd_write_partition(mtd);
+    MtdWriteContext* ctx;
+    ctx = mtd_write_partition(mtd);
     if (ctx == NULL) {
         printf("%s: can't write mtd partition \"%s\"\n",
                 name, partition);
@@ -1085,14 +1080,13 @@
         char* filename = contents->data;
         FILE* f = fopen(filename, "rb");
         if (f == NULL) {
-            printf("%s: can't open %s: %s\n",
-                    name, filename, strerror(errno));
+            printf("%s: can't open %s: %s\n", name, filename, strerror(errno));
             result = strdup("");
             goto done;
         }
 
         success = true;
-        char* buffer = malloc(BUFSIZ);
+        char* buffer = reinterpret_cast<char*>(malloc(BUFSIZ));
         int read;
         while (success && (read = fread(buffer, 1, BUFSIZ, f)) > 0) {
             int wrote = mtd_write_data(ctx, buffer, read);
@@ -1139,8 +1133,7 @@
     char* endptr;
     size_t bytes = strtol(bytes_str, &endptr, 10);
     if (bytes == 0 && endptr == bytes_str) {
-        ErrorAbort(state, "%s(): can't parse \"%s\" as byte count\n\n",
-                   name, bytes_str);
+        ErrorAbort(state, "%s(): can't parse \"%s\" as byte count\n\n", name, bytes_str);
         free(bytes_str);
         return NULL;
     }
@@ -1200,7 +1193,7 @@
         return NULL;
     }
 
-    char** patch_sha_str = malloc(patchcount * sizeof(char*));
+    char** patch_sha_str = reinterpret_cast<char**>(malloc(patchcount * sizeof(char*)));
     for (i = 0; i < patchcount; ++i) {
         patch_sha_str[i] = patches[i*2]->data;
         patches[i*2]->data = NULL;
@@ -1259,7 +1252,7 @@
     for (i = 0; i < argc; ++i) {
         size += strlen(args[i]);
     }
-    char* buffer = malloc(size+1);
+    char* buffer = reinterpret_cast<char*>(malloc(size+1));
     size = 0;
     for (i = 0; i < argc; ++i) {
         strcpy(buffer+size, args[i]);
@@ -1289,7 +1282,7 @@
         return NULL;
     }
 
-    char** args2 = malloc(sizeof(char*) * (argc+1));
+    char** args2 = reinterpret_cast<char**>(malloc(sizeof(char*) * (argc+1)));
     memcpy(args2, args, sizeof(char*) * argc);
     args2[argc] = NULL;
 
@@ -1356,7 +1349,7 @@
     }
 
     int i;
-    uint8_t* arg_digest = malloc(SHA_DIGEST_SIZE);
+    uint8_t* arg_digest = reinterpret_cast<uint8_t*>(malloc(SHA_DIGEST_SIZE));
     for (i = 1; i < argc; ++i) {
         if (args[i]->type != VAL_STRING) {
             printf("%s(): arg %d is not a string; skipping",
@@ -1392,7 +1385,7 @@
     char* filename;
     if (ReadArgs(state, argv, 1, &filename) < 0) return NULL;
 
-    Value* v = malloc(sizeof(Value));
+    Value* v = reinterpret_cast<Value*>(malloc(sizeof(Value)));
     v->type = VAL_BLOB;
 
     FileContents fc;
@@ -1550,15 +1543,14 @@
         return ErrorAbort(state, "%s() could not read args", name);
     }
 
-    int i;
-    char** args2 = malloc(sizeof(char*) * (argc+1));
+    char** args2 = reinterpret_cast<char**>(malloc(sizeof(char*) * (argc+1)));
     // Tune2fs expects the program name as its args[0]
     args2[0] = strdup(name);
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
        args2[i + 1] = args[i];
     }
     int result = tune2fs_main(argc + 1, args2);
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         free(args[i]);
     }
     free(args);
diff --git a/updater/updater.c b/updater/updater.cpp
similarity index 97%
rename from updater/updater.c
rename to updater/updater.cpp
index 661f695..0f22e6d 100644
--- a/updater/updater.c
+++ b/updater/updater.cpp
@@ -89,7 +89,7 @@
         return 4;
     }
 
-    char* script = malloc(script_entry->uncompLen+1);
+    char* script = reinterpret_cast<char*>(malloc(script_entry->uncompLen+1));
     if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
         printf("failed to read script from package\n");
         return 5;