toys/posix/env.c

/* env.c - Set the environment for command invocation.
 *
 * Copyright 2012 Tryn Mirell <tryn@mirell.org>
 *
 * http://opengroup.org/onlinepubs/9699919799/utilities/env.html

USE_ENV(NEWTOY(env, "^i", TOYFLAG_USR|TOYFLAG_BIN))

config ENV
  bool "env"
  default y
  help
    usage: env [-i] [NAME=VALUE...] [command [option...]]

    Set the environment for command invocation.

    -i	Clear existing environment.
*/

#include "toys.h"

extern char **environ;

void env_main(void)
{
  char **ev;
  char **command = NULL;
  char *del = "=";

  if (toys.optflags) clearenv();

  for (ev = toys.optargs; *ev != NULL; ev++) {
    char *env, *val = NULL;

    env = strtok(*ev, del);

    if (env) val = strtok(NULL, del);

    if (val) setenv(env, val, 1);
    else {
      command = ev;
      break;
    }
  }

  if (!command) {
    char **ep;
    if (environ) for (ep = environ; *ep; ep++) xputs(*ep);
  } else xexec_optargs(command - toys.optargs);

}