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ad3f90f6ca
"usage:" string. This is how most (all?) other programs in the system do it. PR: 31596 Submitted by: Cyrille Lefevre <clefevre@citeweb.net>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* Copyright (c) 2000 Peter Wemm <peter@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <err.h>
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#include <unistd.h>
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static char sbuf[1024];
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: kenv [-h] [variable]\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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int name2oid_oid[2];
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int real_oid[CTL_MAXNAME+4];
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size_t oidlen;
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int ch, error, hflag, i, slen;
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char *env, *eq, *name, *var, *val;
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hflag = 0;
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env = NULL;
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while ((ch = getopt(argc, argv, "h")) != -1) {
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switch (ch) {
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case 'h':
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hflag++;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc > 0) {
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env = argv[0];
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argv++;
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argc--;
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}
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if (argc > 0)
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usage();
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name2oid_oid[0] = 0; /* This is magic & undocumented! */
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name2oid_oid[1] = 3;
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oidlen = sizeof(real_oid);
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name = "kern.environment";
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error = sysctl(name2oid_oid, 2, real_oid, &oidlen, name, strlen(name));
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if (error < 0)
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err(1, "cannot find kern.environment base sysctl OID");
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oidlen /= sizeof (int);
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if (oidlen >= CTL_MAXNAME)
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errx(1, "kern.environment OID is too large!");
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real_oid[oidlen] = 0;
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for (i = 0; ; i++) {
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real_oid[oidlen + 1] = i;
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slen = sizeof(sbuf) - 1;
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error = sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0);
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if (error < 0) {
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if (errno != ENOENT)
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err(1, "sysctl kern.environment.%d\n", i);
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break;
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}
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sbuf[sizeof(sbuf) - 1] = '\0';
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eq = strchr(sbuf, '=');
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if (eq == NULL)
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err(1, "malformed environment string: %s\n", sbuf);
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var = sbuf;
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*eq = '\0';
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val = eq + 1;
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if (env) {
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if (strcmp(var, env) != 0)
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continue;
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printf("%s\n", val);
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break;
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}
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if (hflag) {
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if (strncmp(var, "hint.", 5) != 0)
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continue;
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/* FALLTHROUGH */
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}
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printf("%s=\"", var);
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while (*val) {
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switch (*val) {
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case '"':
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putchar('\\');
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putchar('"');
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break;
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case '\\':
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putchar('\\');
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putchar('\\');
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break;
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default:
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putchar(*val);
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break;
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}
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val++;
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}
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printf("\"\n");
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}
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exit(0);
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}
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