From 55c640704152694dca1f19bf2a0b86fa2efa99d1 Mon Sep 17 00:00:00 2001
From: Paul McLean <pmclean@google.com>
Date: Thu, 19 Dec 2013 15:47:29 -0800
Subject: [PATCH] Adding a handy predicate function (str_parms_has_key()

Change-Id: I1af5c260a1a820b65f0850ea9adb38b01fcb183c
---
 include/cutils/str_parms.h | 6 ++++++
 libcutils/str_parms.c      | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/include/cutils/str_parms.h b/include/cutils/str_parms.h
index 247c996f5..66f363770 100644
--- a/include/cutils/str_parms.h
+++ b/include/cutils/str_parms.h
@@ -34,6 +34,12 @@ int str_parms_add_int(struct str_parms *str_parms, const char *key, int value);
 int str_parms_add_float(struct str_parms *str_parms, const char *key,
                         float value);
 
+// Returns non-zero if the str_parms contains the specified key.
+int str_parms_has_key(struct str_parms *str_parms, const char *key);
+
+// Gets value associated with the specified key (if present), placing it in the buffer
+// pointed to by the out_val parameter.  Returns the length of the returned string value.
+// If 'key' isn't in the parms, then return -ENOENT (-2) and leave 'out_val' untouched.
 int str_parms_get_str(struct str_parms *str_parms, const char *key,
                       char *out_val, int len);
 int str_parms_get_int(struct str_parms *str_parms, const char *key,
diff --git a/libcutils/str_parms.c b/libcutils/str_parms.c
index 7cfbcb354..1edef118f 100644
--- a/libcutils/str_parms.c
+++ b/libcutils/str_parms.c
@@ -240,6 +240,10 @@ int str_parms_add_float(struct str_parms *str_parms, const char *key,
     return ret;
 }
 
+int str_parms_has_key(struct str_parms *str_parms, const char *key) {
+    return hashmapGet(str_parms->map, (void *)key) != NULL;
+}
+
 int str_parms_get_str(struct str_parms *str_parms, const char *key, char *val,
                       int len)
 {