Initial Contribution

1 files changed, 185 insertions, 0 deletions

diff --git a/libs/utils/misc.cpp b/libs/utils/misc.cpp
new file mode 100644
index 0000000..dc89d15
--- /dev/null
+++ b/libs/utils/misc.cpp
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2005 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.
+ */
+
+//
+// Miscellaneous utility functions.
+//
+#include <utils/misc.h>
+
+#include <sys/stat.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdio.h>
+
+using namespace android;
+
+namespace android {
+
+/*
+ * Like strdup(), but uses C++ "new" operator instead of malloc.
+ */
+char* strdupNew(const char* str)
+{
+    char* newStr;
+    int len;
+
+    if (str == NULL)
+        return NULL;
+
+    len = strlen(str);
+    newStr = new char[len+1];
+    memcpy(newStr, str, len+1);
+
+    return newStr;
+}
+
+/*
+ * Concatenate an argument vector.
+ */
+char* concatArgv(int argc, const char* const argv[])
+{
+    char* newStr = NULL;
+    int len, totalLen, posn, idx;
+
+    /*
+     * First, figure out the total length.
+     */
+    totalLen = idx = 0;
+    while (1) {
+        if (idx == argc || argv[idx] == NULL)
+            break;
+        if (idx)
+            totalLen++;  // leave a space between args
+        totalLen += strlen(argv[idx]);
+        idx++;
+    }
+
+    /*
+     * Alloc the string.
+     */
+    newStr = new char[totalLen +1];
+    if (newStr == NULL)
+        return NULL;
+
+    /*
+     * Finally, allocate the string and copy data over.
+     */
+    idx = posn = 0;
+    while (1) {
+        if (idx == argc || argv[idx] == NULL)
+            break;
+        if (idx)
+            newStr[posn++] = ' ';
+
+        len = strlen(argv[idx]);
+        memcpy(&newStr[posn], argv[idx], len);
+        posn += len;
+
+        idx++;
+    }
+
+    assert(posn == totalLen);
+    newStr[posn] = '\0';
+
+    return newStr;
+}
+
+/*
+ * Count the #of args in an argument vector.  Don't count the final NULL.
+ */
+int countArgv(const char* const argv[])
+{
+    int count = 0;
+
+    while (argv[count] != NULL)
+        count++;
+
+    return count;
+}
+
+
+#include <stdio.h>
+/*
+ * Get a file's type.
+ */
+FileType getFileType(const char* fileName)
+{
+    struct stat sb;
+
+    if (stat(fileName, &sb) < 0) {
+        if (errno == ENOENT || errno == ENOTDIR)
+            return kFileTypeNonexistent;
+        else {
+            fprintf(stderr, "getFileType got errno=%d on '%s'\n",
+                errno, fileName);
+            return kFileTypeUnknown;
+        }
+    } else {
+        if (S_ISREG(sb.st_mode))
+            return kFileTypeRegular;
+        else if (S_ISDIR(sb.st_mode))
+            return kFileTypeDirectory;
+        else if (S_ISCHR(sb.st_mode))
+            return kFileTypeCharDev;
+        else if (S_ISBLK(sb.st_mode))
+            return kFileTypeBlockDev;
+        else if (S_ISFIFO(sb.st_mode))
+            return kFileTypeFifo;
+#ifdef HAVE_SYMLINKS            
+        else if (S_ISLNK(sb.st_mode))
+            return kFileTypeSymlink;
+        else if (S_ISSOCK(sb.st_mode))
+            return kFileTypeSocket;
+#endif            
+        else
+            return kFileTypeUnknown;
+    }
+}
+
+/*
+ * Get a file's modification date.
+ */
+time_t getFileModDate(const char* fileName)
+{
+    struct stat sb;
+
+    if (stat(fileName, &sb) < 0)
+        return (time_t) -1;
+
+    return sb.st_mtime;
+}
+
+/*
+ * Round up to the next highest power of 2.
+ *
+ * Found on http://graphics.stanford.edu/~seander/bithacks.html.
+ */
+unsigned int roundUpPower2(unsigned int val)
+{
+    val--;
+    val |= val >> 1;
+    val |= val >> 2;
+    val |= val >> 4;
+    val |= val >> 8;
+    val |= val >> 16;
+    val++;
+
+    return val;
+}
+
+}; // namespace android
+