1 files changed, 44 insertions, 0 deletions
diff --git a/toys/android/setprop.c b/toys/android/setprop.c
new file mode 100644
index 00000000..cda34a5d
--- /dev/null
+++ b/toys/android/setprop.c
@@ -0,0 +1,44 @@
+/* setprop.c - Set an Android system property
+ *
+ * Copyright 2015 The Android Open Source Project
+
+USE_SETPROP(NEWTOY(setprop, "<2>2", TOYFLAG_USR|TOYFLAG_SBIN))
+
+config SETPROP
+  bool "setprop"
+  default y
+  depends on TOYBOX_ON_ANDROID
+  help
+    usage: setprop NAME VALUE
+
+    Sets an Android system property.
+*/
+
+#define FOR_setprop
+#include "toys.h"
+
+void setprop_main(void)
+{
+  char *name = toys.optargs[0], *value = toys.optargs[1];
+  char *p;
+  size_t name_len = strlen(name), value_len = strlen(value);
+
+  // property_set doesn't tell us why it failed, and actually can't
+  // recognize most failures (because it doesn't wait for init), so
+  // we duplicate all of init's checks here to help the user.
+
+  if (value_len >= PROP_VALUE_MAX && !strncmp(value, "ro.", 3))
+    error_exit("value '%s' too long; try '%.*s'",
+               value, PROP_VALUE_MAX - 1, value);
+
+  if (*name == '.' || name[name_len - 1] == '.')
+    error_exit("property names must not start or end with '.'");
+  if (strstr(name, ".."))
+    error_exit("'..' is not allowed in a property name");
+  for (p = name; *p; ++p)
+    if (!isalnum(*p) && !strchr(":@_.-", *p))
+      error_exit("invalid character '%c' in name '%s'", *p, name);
+
+  if (__system_property_set(name, value))
+    error_msg("failed to set property '%s' to '%s'", name, value);
+}