Add __android_log_assert.

third_party/hwcplus/src/hwcplus_util.c

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 
+#include <android/log.h>
+#include <cutils/properties.h>
 #include <hardware/hardware.h>
-#include <cutils/properties.h>
 
 #define LOG_BUF_SIZE 1024
 
 static int default_log_fn(int prio, const char* tag, const char* msg);
 
 static hwcplus_log_fn_t hwcplus_log_fn = default_log_fn;
 
 void hwcplus_set_log_fn(hwcplus_log_fn_t fn) {
     hwcplus_log_fn = fn;
 }
@@ skipping 36 matching lines @@
     va_list ap;
     char buf[LOG_BUF_SIZE];
 
     va_start(ap, fmt);
     vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
     va_end(ap);
 
     return __android_log_write(prio, tag, buf);
 }
 
+void __android_log_assert(const char* cond,
+                          const char* tag,
+                          const char* fmt,
+                          ...) {
+    char buf[LOG_BUF_SIZE];
+
+    if (fmt) {
+        va_list ap;
+        va_start(ap, fmt);
+        vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
+        va_end(ap);
+    } else {
+        /* Msg not provided, log condition.  N.B. Do not use cond directly as
+         * format string as it could contain spurious '%' syntax (e.g.
+         * "%d" in "blocks%devs == 0").
+         */
+        if (cond)
+            snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
+        else
+            snprintf(buf, LOG_BUF_SIZE, "Unspecified assertion failed");
+    }
+
+    __android_log_write(ANDROID_LOG_FATAL, tag, buf);
+
+    __builtin_trap(); /* trap so we have a chance to debug the situation */
+}
+
 int property_get(const char* key, char* value, const char* default_value) {
     printf("property_get %s\n", key);
     const char* r = default_value;
     if (!r)
         r = "";
     strncpy(value, r, PROPERTY_VALUE_MAX);
     return strlen(r);
 }
-