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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: getconf.c,v 1.12 2009/10/27 23:59:38 deraadt Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by J.T. Conklin.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Winning Strategies, Inc.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * POSIX.2 getconf utility
 *
 * Written by:
 *	J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>

static void usage(void);

struct conf_variable
{
  const char *name;
  enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
  long value;
};

const struct conf_variable conf_table[] =
{
  { "PATH",			CONFSTR,	_CS_PATH		},

  /* Utility Limit Minimum Values */
  { "POSIX2_BC_BASE_MAX",	CONSTANT,	_POSIX2_BC_BASE_MAX	},
  { "POSIX2_BC_DIM_MAX",	CONSTANT,	_POSIX2_BC_DIM_MAX	},
  { "POSIX2_BC_SCALE_MAX",	CONSTANT,	_POSIX2_BC_SCALE_MAX	},
  { "POSIX2_BC_STRING_MAX",	CONSTANT,	_POSIX2_BC_STRING_MAX	},
  { "POSIX2_COLL_WEIGHTS_MAX",	CONSTANT,	_POSIX2_COLL_WEIGHTS_MAX },
  { "POSIX2_EXPR_NEST_MAX",	CONSTANT,	_POSIX2_EXPR_NEST_MAX	},
  { "POSIX2_LINE_MAX",		CONSTANT,	_POSIX2_LINE_MAX	},
  { "POSIX2_RE_DUP_MAX",	CONSTANT,	_POSIX2_RE_DUP_MAX	},
  { "POSIX2_VERSION",		CONSTANT,	_POSIX2_VERSION		},

  /* POSIX.1 Minimum Values */
  { "_POSIX_ARG_MAX",		CONSTANT,	_POSIX_ARG_MAX		},
  { "_POSIX_CHILD_MAX",		CONSTANT,	_POSIX_CHILD_MAX	},
  { "_POSIX_LINK_MAX",		CONSTANT,	_POSIX_LINK_MAX		},
  { "_POSIX_MAX_CANON",		CONSTANT,	_POSIX_MAX_CANON	},
  { "_POSIX_MAX_INPUT",		CONSTANT,	_POSIX_MAX_INPUT	},
  { "_POSIX_NAME_MAX",		CONSTANT,	_POSIX_NAME_MAX		},
  { "_POSIX_NGROUPS_MAX",	CONSTANT,	_POSIX_NGROUPS_MAX	},
  { "_POSIX_OPEN_MAX",		CONSTANT,	_POSIX_OPEN_MAX		},
  { "_POSIX_PATH_MAX",		CONSTANT,	_POSIX_PATH_MAX		},
  { "_POSIX_PIPE_BUF",		CONSTANT,	_POSIX_PIPE_BUF		},
  { "_POSIX_SSIZE_MAX",		CONSTANT,	_POSIX_SSIZE_MAX	},
  { "_POSIX_STREAM_MAX",	CONSTANT,	_POSIX_STREAM_MAX	},
  { "_POSIX_TZNAME_MAX",	CONSTANT,	_POSIX_TZNAME_MAX	},

  /* Symbolic Utility Limits */
  { "BC_BASE_MAX",		SYSCONF,	_SC_BC_BASE_MAX		},
  { "BC_DIM_MAX",		SYSCONF,	_SC_BC_DIM_MAX		},
  { "BC_SCALE_MAX",		SYSCONF,	_SC_BC_SCALE_MAX	},
  { "BC_STRING_MAX",		SYSCONF,	_SC_BC_STRING_MAX	},
  { "COLL_WEIGHTS_MAX",		SYSCONF,	_SC_COLL_WEIGHTS_MAX	},
  { "EXPR_NEST_MAX",		SYSCONF,	_SC_EXPR_NEST_MAX	},
  { "LINE_MAX",			SYSCONF,	_SC_LINE_MAX		},
  { "RE_DUP_MAX",		SYSCONF,	_SC_RE_DUP_MAX		},

  /* Optional Facility Configuration Values */
#if 0
  { "POSIX2_C_BIND",		SYSCONF,	???			},
#endif
  { "POSIX2_C_DEV",		SYSCONF,	_SC_2_C_DEV		},
  { "POSIX2_CHAR_TERM",		SYSCONF,	_SC_2_CHAR_TERM		},
  { "POSIX2_FORT_DEV",		SYSCONF,	_SC_2_FORT_DEV		},
  { "POSIX2_FORT_RUN",		SYSCONF,	_SC_2_FORT_RUN		},
  { "POSIX2_LOCALEDEF",		SYSCONF,	_SC_2_LOCALEDEF		},
  { "POSIX2_SW_DEV",		SYSCONF,	_SC_2_SW_DEV		},
  { "POSIX2_UPE",		SYSCONF,	_SC_2_UPE		},

  /* POSIX.1 Configurable System Variables */
  { "ARG_MAX",			SYSCONF,	_SC_ARG_MAX 		},
  { "CHILD_MAX",		SYSCONF,	_SC_CHILD_MAX		},
  { "CLK_TCK",			SYSCONF,	_SC_CLK_TCK		},
  { "NGROUPS_MAX",		SYSCONF,	_SC_NGROUPS_MAX		},
  { "OPEN_MAX",			SYSCONF,	_SC_OPEN_MAX		},
  { "STREAM_MAX",		SYSCONF,	_SC_STREAM_MAX		},
  { "TZNAME_MAX",		SYSCONF,	_SC_TZNAME_MAX		},
  { "_POSIX_JOB_CONTROL",	SYSCONF,	_SC_JOB_CONTROL 	},
  { "_POSIX_SAVED_IDS",		SYSCONF,	_SC_SAVED_IDS		},
  { "_POSIX_VERSION",		SYSCONF,	_SC_VERSION		},

  { "LINK_MAX",			PATHCONF,	_PC_LINK_MAX		},
  { "MAX_CANON",		PATHCONF,	_PC_MAX_CANON		},
  { "MAX_INPUT",		PATHCONF,	_PC_MAX_INPUT		},
  { "NAME_MAX",			PATHCONF,	_PC_NAME_MAX		},
  { "PATH_MAX",			PATHCONF,	_PC_PATH_MAX		},
  { "PIPE_BUF",			PATHCONF,	_PC_PIPE_BUF		},
  { "_POSIX_CHOWN_RESTRICTED",	PATHCONF,	_PC_CHOWN_RESTRICTED	},
  { "_POSIX_NO_TRUNC",		PATHCONF,	_PC_NO_TRUNC		},
  { "_POSIX_VDISABLE",		PATHCONF,	_PC_VDISABLE		},

  { NULL }
};


int
main(int argc, char *argv[])
{
	int ch;
	const struct conf_variable *cp;

	long val;
	size_t slen;
	char * sval;

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "")) != -1) {
		switch (ch) {
		case '?':
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (argc < 1 || argc > 2) {
		usage();
		/* NOTREACHED */
	}

	for (cp = conf_table; cp->name != NULL; cp++) {
		if (strcmp(*argv, cp->name) == 0)
			break;
	}
	if (cp->name == NULL) {
		errx(1, "%s: unknown variable", *argv);
		/* NOTREACHED */
	}

	if (cp->type == PATHCONF) {
		if (argc != 2) usage();
	} else {
		if (argc != 1) usage();
	}

	switch (cp->type) {
	case CONSTANT:
		printf("%ld\n", cp->value);
		break;

	case CONFSTR:
		errno = 0;
		slen = confstr (cp->value, (char *) 0, (size_t) 0);
		
		if (slen == 0 || slen == (size_t)-1) {
			if (errno)
				err(1, "%ld", cp->value);
			else
				errx(1, "%ld", cp->value);
		}
		if ((sval = malloc(slen)) == NULL)
			err(1, NULL);

		confstr(cp->value, sval, slen);
		printf("%s\n", sval);
		break;

	case SYSCONF:
		errno = 0;
		if ((val = sysconf(cp->value)) == -1) {
			if (errno != 0) {
				err(1, NULL);
				/* NOTREACHED */
			}

			printf ("undefined\n");
		} else {
			printf("%ld\n", val);
		}
		break;

	case PATHCONF:
		errno = 0;
		if ((val = pathconf(argv[1], cp->value)) == -1) {
			if (errno != 0) {
				err(1, "%s", argv[1]);
				/* NOTREACHED */
			}

			printf ("undefined\n");
		} else {
			printf ("%ld\n", val);
		}
		break;
	}

	exit (ferror(stdout));
}


static void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr, "usage: %s name [pathname]\n", __progname);
	exit(1);
}