freebsd-dev/bin/kenv/kenv.c
Xin LI 41f05c8281 Constify parameters, no functional or binary change.
Verified with:	sha256(1)
MFC after:	2 weeks
2013-05-15 18:38:28 +00:00

207 lines
4.3 KiB
C

/*-
* Copyright (c) 2000 Peter Wemm <peter@freebsd.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/sysctl.h>
#include <err.h>
#include <kenv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
static int kdumpenv(void);
static int kgetenv(const char *);
static int ksetenv(const char *, char *);
static int kunsetenv(const char *);
static int hflag = 0;
static int Nflag = 0;
static int qflag = 0;
static int uflag = 0;
static int vflag = 0;
static void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n%s\n",
"usage: kenv [-hNq]",
" kenv [-qv] variable[=value]",
" kenv [-q] -u variable");
exit(1);
}
int
main(int argc, char **argv)
{
char *env, *eq, *val;
int ch, error;
error = 0;
val = NULL;
env = NULL;
while ((ch = getopt(argc, argv, "hNquv")) != -1) {
switch (ch) {
case 'h':
hflag++;
break;
case 'N':
Nflag++;
break;
case 'q':
qflag++;
break;
case 'u':
uflag++;
break;
case 'v':
vflag++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0) {
env = argv[0];
eq = strchr(env, '=');
if (eq != NULL) {
*eq++ = '\0';
val = eq;
}
argv++;
argc--;
}
if ((hflag || Nflag) && env != NULL)
usage();
if (argc > 0 || ((uflag || vflag) && env == NULL))
usage();
if (env == NULL) {
error = kdumpenv();
if (error && !qflag)
warn("kdumpenv");
} else if (val == NULL) {
if (uflag) {
error = kunsetenv(env);
if (error && !qflag)
warnx("unable to unset %s", env);
} else {
error = kgetenv(env);
if (error && !qflag)
warnx("unable to get %s", env);
}
} else {
error = ksetenv(env, val);
if (error && !qflag)
warnx("unable to set %s to %s", env, val);
}
return (error);
}
static int
kdumpenv(void)
{
char *buf, *cp;
int buflen, envlen;
envlen = kenv(KENV_DUMP, NULL, NULL, 0);
if (envlen < 0)
return (-1);
for (;;) {
buflen = envlen * 120 / 100;
buf = malloc(buflen + 1);
if (buf == NULL)
return (-1);
memset(buf, 0, buflen + 1); /* Be defensive */
envlen = kenv(KENV_DUMP, NULL, buf, buflen);
if (envlen < 0) {
free(buf);
return (-1);
}
if (envlen > buflen)
free(buf);
else
break;
}
for (; *buf != '\0'; buf += strlen(buf) + 1) {
if (hflag) {
if (strncmp(buf, "hint.", 5) != 0)
continue;
}
cp = strchr(buf, '=');
if (cp == NULL)
continue;
*cp++ = '\0';
if (Nflag)
printf("%s\n", buf);
else
printf("%s=\"%s\"\n", buf, cp);
buf = cp;
}
return (0);
}
static int
kgetenv(const char *env)
{
char buf[1024];
int ret;
ret = kenv(KENV_GET, env, buf, sizeof(buf));
if (ret == -1)
return (ret);
if (vflag)
printf("%s=\"%s\"\n", env, buf);
else
printf("%s\n", buf);
return (0);
}
static int
ksetenv(const char *env, char *val)
{
int ret;
ret = kenv(KENV_SET, env, val, strlen(val)+1);
if (ret == 0)
printf("%s=\"%s\"\n", env, val);
return (ret);
}
static int
kunsetenv(const char *env)
{
int ret;
ret = kenv(KENV_UNSET, env, NULL, 0);
return (ret);
}