diff options
Diffstat (limited to 'src/printenv.c')
| -rw-r--r-- | src/printenv.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/printenv.c b/src/printenv.c new file mode 100644 index 0000000..e06b704 --- /dev/null +++ b/src/printenv.c @@ -0,0 +1,134 @@ +/* printenv -- print all or part of environment + Copyright (C) 1989-1997, 1999-2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Usage: printenv [variable...] + + If no arguments are given, print the entire environment. + If one or more variable names are given, print the value of + each one that is set, and nothing for ones that are not set. + + Exit status: + 0 if all variables specified were found + 1 if not + 2 if some other error occurred + + David MacKenzie and Richard Mlynarik */ + +#include <config.h> +#include <stdio.h> +#include <sys/types.h> +#include <getopt.h> + +#include "system.h" +#include "error.h" +#include "long-options.h" + +/* Exit status for syntax errors, etc. */ +enum { PRINTENV_FAILURE = 2 }; + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "printenv" + +#define AUTHORS "David MacKenzie", "Richard Mlynarik" + +/* The name this program was run with. */ +char *program_name; + +extern char **environ; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("\ +Usage: %s [VARIABLE]...\n\ + or: %s OPTION\n\ +If no environment VARIABLE specified, print them all.\n\ +\n\ +"), + program_name, program_name); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + char **env; + char *ep, *ap; + int i; + bool ok; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + initialize_exit_failure (PRINTENV_FAILURE); + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "+", NULL, NULL) != -1) + usage (PRINTENV_FAILURE); + + if (optind >= argc) + { + for (env = environ; *env != NULL; ++env) + puts (*env); + ok = true; + } + else + { + int matches = 0; + + for (i = optind; i < argc; ++i) + { + bool matched = false; + + for (env = environ; *env; ++env) + { + ep = *env; + ap = argv[i]; + while (*ep != '\0' && *ap != '\0' && *ep++ == *ap++) + { + if (*ep == '=' && *ap == '\0') + { + puts (ep + 1); + matched = true; + break; + } + } + } + + matches += matched; + } + + ok = (matches == argc - optind); + } + + exit (ok ? EXIT_SUCCESS : EXIT_FAILURE); +} |