Android getprop and setprop from Elliott Hughes.

2 files changed, 150 insertions, 0 deletions

diff --git a/toys/android/getprop.c b/toys/android/getprop.c
new file mode 100644
index 00000000..66530419
--- /dev/null
+++ b/toys/android/getprop.c
@@ -0,0 +1,98 @@
+/* getprop.c - Get an Android system property
+ *
+ * Copyright 2015 The Android Open Source Project
+
+USE_GETPROP(NEWTOY(getprop, ">2", TOYFLAG_USR|TOYFLAG_SBIN))
+
+config GETPROP
+  bool "getprop"
+  default y
+  help
+    usage: getprop [NAME [DEFAULT]]
+
+    Gets an Android system property, or lists them all.
+*/
+
+#define FOR_getprop
+#include "toys.h"
+
+#if defined(__ANDROID__)
+
+#include <cutils/properties.h>
+
+GLOBALS(
+  size_t size;
+  size_t capacity;
+)
+
+struct property_info {
+  char *name;
+  char *value;
+};
+
+static struct property_info **properties;
+
+static void add_property(const char *name, const char *value, void *unused)
+{
+  struct property_info *new = xmalloc(sizeof(struct property_info));
+
+  if (TT.size >= TT.capacity) {
+    TT.capacity += 32;
+    properties = xrealloc(properties,
+        TT.capacity * sizeof(struct property_info *));
+  }
+
+  // TODO: fix xstrdup signature so we can remove these bogus casts.
+  new->name = xstrdup((char *) name);
+  new->value = xstrdup((char *) value);
+  properties[TT.size++] = new;
+}
+
+static void free_properties()
+{
+  size_t i;
+
+  for (i = 0; i < TT.size; ++i) {
+    free(properties[i]->name);
+    free(properties[i]->value);
+    free(properties[i]);
+  }
+  free(properties);
+}
+
+static int property_cmp(const void *a, const void *b)
+{
+  struct property_info *pa = *((struct property_info **)a);
+  struct property_info *pb = *((struct property_info **)b);
+
+  return strcmp(pa->name, pb->name);
+}
+
+void getprop_main(void)
+{
+  if (*toys.optargs) {
+    char value[PROPERTY_VALUE_MAX];
+    const char *default_value = "";
+
+    if (toys.optargs[1]) default_value = toys.optargs[1];
+    property_get(*toys.optargs, value, default_value);
+    puts(value);
+  } else {
+    size_t i;
+
+    if (property_list(add_property, NULL))
+      error_exit("property_list failed");
+    qsort(properties, TT.size, sizeof(struct property_info *), property_cmp);
+    for (i = 0; i < TT.size; ++i)
+      printf("[%s]: [%s]\n", properties[i]->name, properties[i]->value);
+    if (CFG_TOYBOX_FREE) free_properties();
+  }
+}
+
+#else
+
+void getprop_main(void)
+{
+}
+
+#endif
diff --git a/toys/android/setprop.c b/toys/android/setprop.c
new file mode 100644
index 00000000..ef24c9ad
--- /dev/null
+++ b/toys/android/setprop.c
@@ -0,0 +1,52 @@
+/* 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
+  help
+    usage: setprop NAME VALUE
+
+    Sets an Android system property.
+*/
+
+#define FOR_setprop
+#include "toys.h"
+
+#if defined(__ANDROID__)
+#include <cutils/properties.h>
+#endif
+
+void setprop_main(void)
+{
+#if defined(__ANDROID__)
+  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 (name_len >= PROP_NAME_MAX)
+    error_exit("name '%s' too long; try '%.*s'",
+               name, PROP_NAME_MAX - 1, name);
+  if (value_len >= PROP_VALUE_MAX)
+    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 (property_set(name, value))
+    error_msg("failed to set property '%s' to '%s'", name, value);
+#endif
+}