text: /* 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);
  }
  