diff options
Diffstat (limited to 'src/env.c')
| -rw-r--r-- | src/env.c | 26 |
1 files changed, 24 insertions, 2 deletions
@@ -80,6 +80,9 @@ #include <stdio.h> #include <getopt.h> #include <sys/types.h> +#include <getopt.h> + +#include "version.h" #include "system.h" int putenv (); @@ -92,10 +95,18 @@ extern char **environ; /* The name by which this program was run. */ char *program_name; +/* If non-zero, display usage information and exit. */ +static int show_help; + +/* If non-zero, print the version on standard error. */ +static int show_version; + static struct option const longopts[] = { + {"help", no_argument, &show_help, 1}, {"ignore-environment", no_argument, NULL, 'i'}, {"unset", required_argument, NULL, 'u'}, + {"version", no_argument, &show_version, 1}, {NULL, 0, NULL, 0} }; @@ -115,6 +126,8 @@ main (argc, argv, envp) { switch (optc) { + case 0: + break; case 'i': ignore_environment = 1; break; @@ -125,6 +138,15 @@ main (argc, argv, envp) } } + if (show_version) + { + printf ("%s\n", version_string); + exit (0); + } + + if (show_help) + usage (); + if (optind != argc && !strcmp (argv[optind], "-")) ignore_environment = 1; @@ -162,8 +184,8 @@ static void usage () { fprintf (stderr, "\ -Usage: %s [-] [-i] [-u name] [--ignore-environment] [--unset=name]\n\ - [name=value]... [command [args...]]\n", +Usage: %s [{--help,--version}] [-] [-i] [-u name] [--ignore-environment]\n\ + [--unset=name] [name=value]... [command [args...]]\n", program_name); exit (2); } |