* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*
- * from util-linux -- adapted for busybox by
- * Erik Andersen <andersee@debian.org>. I ripped out Native Language
+ * from util-linux -- adapted for busybox by
+ * Erik Andersen <andersen@codepoet.org>. I ripped out Native Language
* Support, replaced getopt, added some gotos for redundant stuff.
+ *
+ * Audited and cleaned up on 7 March 2003 to reduce size of
+ * check error handling by Erik Andersen <andersen@codepoet.org>
*/
-#include "internal.h"
-#include <linux/unistd.h>
#include <stdio.h>
-#include <getopt.h>
#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <sys/klog.h>
-#if __GNU_LIBRARY__ < 5
-
-#ifndef __alpha__
-# define __NR_klogctl __NR_syslog
-static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
-#else /* __alpha__ */
-#define klogctl syslog
-#endif
-
-#else
-# include <sys/klog.h>
-#endif
-
-static const char dmesg_usage[] = "dmesg [-c] [-n level] [-s bufsize]\n";
+#include "busybox.h"
int dmesg_main(int argc, char **argv)
{
- char *buf;
+ char *buf
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ = NULL
+#endif
+ ;
int bufsize = 8196;
- int i;
- int n;
+ int i, n;
int level = 0;
int lastc;
int cmd = 3;
- int stopDoingThat;
-
- argc--;
- argv++;
- /* Parse any options */
- while (argc && **argv == '-') {
- stopDoingThat = FALSE;
- while (stopDoingThat == FALSE && *++(*argv)) {
- switch (**argv) {
+ while ((i = getopt(argc, argv, "cn:s:")) > 0) {
+ switch (i) {
case 'c':
cmd = 4;
break;
case 'n':
cmd = 8;
- if (--argc == 0)
- goto end;
- level = atoi(*(++argv));
- if (--argc > 0)
- ++argv;
- stopDoingThat = TRUE;
+ level = bb_xgetlarg(optarg, 10, 0, 10);
break;
case 's':
- if (--argc == 0)
- goto end;
- bufsize = atoi(*(++argv));
- if (--argc > 0)
- ++argv;
- stopDoingThat = TRUE;
+ /* I think a 512k max kernel ring buffer is big enough for
+ * anybody, as the default is 16k... Could be wrong though.
+ * If so I'm sure I'll hear about it by the enraged masses*/
+ bufsize = bb_xgetlarg(optarg, 10, 4096, 512*1024);
break;
default:
- goto end;
- }
+ bb_show_usage();
}
}
- if (argc > 1) {
- goto end;
+ if (optind < argc) {
+ bb_show_usage();
}
if (cmd == 8) {
- n = klogctl(cmd, NULL, level);
- if (n < 0) {
- goto klogctl_error;
- }
- exit(TRUE);
+ if (klogctl(cmd, NULL, level) < 0)
+ goto die_the_death;
+ goto all_done;
}
- if (bufsize < 4096)
- bufsize = 4096;
- buf = (char *) malloc(bufsize);
- n = klogctl(cmd, buf, bufsize);
- if (n < 0) {
- goto klogctl_error;
- }
+ buf = xmalloc(bufsize);
+ if ((n = klogctl(cmd, buf, bufsize)) < 0)
+ goto die_the_death;
lastc = '\n';
for (i = 0; i < n; i++) {
- if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') {
+ if (lastc == '\n' && buf[i] == '<') {
i++;
while (buf[i] >= '0' && buf[i] <= '9')
i++;
}
if (lastc != '\n')
putchar('\n');
- exit(TRUE);
- end:
- usage(dmesg_usage);
- exit(FALSE);
- klogctl_error:
- perror("klogctl");
- exit(FALSE);
-
+all_done:
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ if (buf) {
+ free(buf);
+ }
+#endif
+ return EXIT_SUCCESS;
+die_the_death:
+ bb_perror_nomsg_and_die();
}