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17049c451a
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11909 a95241bf-73f2-0310-859d-f6bbb57e9c96
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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//
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// Copyright (c) 2001-2003, OpenBeOS
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//
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// This software is part of the OpenBeOS distribution and is covered
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// by the OpenBeOS license.
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//
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//
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// File: printenv.c
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// Author: Daniel Reinhold (danielre@users.sf.net)
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// Description: prints environment variables
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//
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// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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#include <OS.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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extern char **environ;
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int print_env(char *);
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int
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main(int argc, char *argv[])
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{
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char *arg = (argc == 2 ? argv[1] : NULL);
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if ((argc > 2) || (arg && !strcmp(arg, "--help"))) {
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printf("Usage: printenv [VARIABLE]\n"
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"If no environment VARIABLE is specified, print them all.\n");
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return 1;
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}
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return print_env(arg);
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}
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int
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print_env(char *arg)
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{
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char **env = environ;
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if (arg == NULL) {
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// print all environment 'key=value' pairs (one per line)
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while (*env)
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printf("%s\n", *env++);
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return 0;
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} else {
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// print only the value of the specified variable
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char *s;
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int len = strlen(arg);
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bool found = false;
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while ((s = *env++) != NULL)
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if (!strncmp(s, arg, len)) {
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char *p = strchr(s, '=');
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if (p) {
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printf("%s\n", p+1);
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found = true;
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}
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}
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return (found ? 0 : 1);
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}
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}
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