1 files changed, 96 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/common/system_utils.cpp b/gfx/angle/checkout/src/common/system_utils.cpp
new file mode 100644
index 0000000000..e05cf8b7fb
--- /dev/null
+++ b/gfx/angle/checkout/src/common/system_utils.cpp
@@ -0,0 +1,96 @@
+//
+// Copyright 2018 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// system_utils.cpp: Implementation of common functions
+
+#include "common/system_utils.h"
+
+#include <stdlib.h>
+
+#if defined(ANGLE_PLATFORM_ANDROID)
+#    include <sys/system_properties.h>
+#endif
+
+namespace angle
+{
+std::string GetExecutableName()
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 21
+    // Support for "getprogname" function in bionic was introduced in L (API level 21)
+    const char *executableName = getprogname();
+    return (executableName) ? std::string(executableName) : "ANGLE";
+#else
+    std::string executableName = GetExecutablePath();
+    size_t lastPathSepLoc      = executableName.find_last_of(GetPathSeparator());
+    return (lastPathSepLoc > 0 ? executableName.substr(lastPathSepLoc + 1, executableName.length())
+                               : "ANGLE");
+#endif  // ANGLE_PLATFORM_ANDROID
+}
+
+// On Android return value cached in the process environment, if none, call
+// GetEnvironmentVarOrUnCachedAndroidProperty if not in environment.
+std::string GetEnvironmentVarOrAndroidProperty(const char *variableName, const char *propertyName)
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 21
+    // Can't use GetEnvironmentVar here because that won't allow us to distinguish between the
+    // environment being set to an empty string vs. not set at all.
+    const char *variableValue = getenv(variableName);
+    if (variableValue != nullptr)
+    {
+        std::string value(variableValue);
+        return value;
+    }
+#endif
+    return GetEnvironmentVarOrUnCachedAndroidProperty(variableName, propertyName);
+}
+
+// Call out to 'getprop' on a shell to get an Android property.  If the value was set, set an
+// environment variable with that value.  Return the value of the environment variable.
+std::string GetEnvironmentVarOrUnCachedAndroidProperty(const char *variableName,
+                                                       const char *propertyName)
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 26
+    std::string propertyValue;
+
+    const prop_info *propertyInfo = __system_property_find(propertyName);
+    if (propertyInfo != nullptr)
+    {
+        __system_property_read_callback(
+            propertyInfo,
+            [](void *cookie, const char *, const char *value, unsigned) {
+                auto propertyValue = reinterpret_cast<std::string *>(cookie);
+                *propertyValue     = value;
+            },
+            &propertyValue);
+    }
+
+    // Set the environment variable with the value.
+    SetEnvironmentVar(variableName, propertyValue.c_str());
+    return propertyValue;
+#endif  // ANGLE_PLATFORM_ANDROID
+    // Return the environment variable's value.
+    return GetEnvironmentVar(variableName);
+}
+
+bool PrependPathToEnvironmentVar(const char *variableName, const char *path)
+{
+    std::string oldValue = GetEnvironmentVar(variableName);
+    const char *newValue = nullptr;
+    std::string buf;
+    if (oldValue.empty())
+    {
+        newValue = path;
+    }
+    else
+    {
+        buf = path;
+        buf += GetPathSeparatorForEnvironmentVar();
+        buf += oldValue;
+        newValue = buf.c_str();
+    }
+    return SetEnvironmentVar(variableName, newValue);
+}
+}  // namespace angle