X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=util-linux%2Fdmesg.c;h=6505da54bcf2c972ef8a553d8ab244024d05e3df;hb=66426760beef7e87c4735f433d123daf911b5b4a;hp=df2bce7133b6afb76ed25940560c7cfce63b7f2d;hpb=be909b1cd5a41c47e5c3a720a53651a81e158c68;p=oweals%2Fbusybox.git

diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index df2bce713..6505da54b 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -1,131 +1,87 @@
 /* vi: set sw=4 ts=4: */
-/* dmesg.c -- Print out the contents of the kernel ring buffer
- * Created: Sat Oct  9 16:19:47 1993
- * Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
- * Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
- * This program comes with ABSOLUTELY NO WARRANTY.
- * Modifications by Rick Sladkey (jrs@world.std.com)
- * Larger buffersize 3 June 1998 by Nicolai Langfeldt, based on a patch
- * by Peeter Joot.  This was also suggested by John Hudson.
- * 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 
- * Support, replaced getopt, added some gotos for redundant stuff.
+ * dmesg - display/control kernel ring buffer.
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 
-#include "internal.h"
-#include <stdio.h>
-#include <stdlib.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
+//usage:#define dmesg_trivial_usage
+//usage:       "[-c] [-n LEVEL] [-s SIZE]"
+//usage:#define dmesg_full_usage "\n\n"
+//usage:       "Print or control the kernel ring buffer\n"
+//usage:     "\n	-c		Clear ring buffer after printing"
+//usage:     "\n	-n LEVEL	Set console logging level"
+//usage:     "\n	-s SIZE		Buffer size"
 
-static const char dmesg_usage[] = "dmesg [-c] [-n LEVEL] [-s SIZE]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nPrints or controls the kernel ring buffer\n\n"
-	"Options:\n"
-	"\t-c\t\tClears the ring buffer's contents after printing\n"
-	"\t-n LEVEL\tSets console logging level\n"
-	"\t-s SIZE\t\tUse a buffer of size SIZE\n"
-#endif
-	;
+#include <sys/klog.h>
+#include "libbb.h"
 
-int dmesg_main(int argc, char **argv)
+int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int dmesg_main(int argc UNUSED_PARAM, char **argv)
 {
+	int len, level;
 	char *buf;
-	int bufsize = 8196;
-	int i;
-	int n;
-	int level = 0;
-	int lastc;
-	int cmd = 3;
-	int stopDoingThat;
+	unsigned opts;
+	enum {
+		OPT_c = 1 << 0,
+		OPT_s = 1 << 1,
+		OPT_n = 1 << 2
+	};
 
-	argc--;
-	argv++;
-
-	/* Parse any options */
-	while (argc && **argv == '-') {
-		stopDoingThat = FALSE;
-		while (stopDoingThat == FALSE && *++(*argv)) {
-			switch (**argv) {
-			case 'c':
-				cmd = 4;
-				break;
-			case 'n':
-				cmd = 8;
-				if (--argc == 0)
-					goto end;
-				level = atoi(*(++argv));
-				if (--argc > 0)
-					++argv;
-				stopDoingThat = TRUE;
-				break;
-			case 's':
-				if (--argc == 0)
-					goto end;
-				bufsize = atoi(*(++argv));
-				if (--argc > 0)
-					++argv;
-				stopDoingThat = TRUE;
-				break;
-			default:
-				goto end;
-			}
-		}
+	opt_complementary = "s+:n+"; /* numeric */
+	opts = getopt32(argv, "cs:n:", &len, &level);
+	if (opts & OPT_n) {
+		if (klogctl(8, NULL, (long) level))
+			bb_perror_msg_and_die("klogctl");
+		return EXIT_SUCCESS;
 	}
 
-	if (argc > 1) {
-		goto end;
-	}
+	if (!(opts & OPT_s))
+		len = klogctl(10, NULL, 0); /* read ring buffer size */
+	if (len < 16*1024)
+		len = 16*1024;
+	if (len > 16*1024*1024)
+		len = 16*1024*1024;
 
-	if (cmd == 8) {
-		n = klogctl(cmd, NULL, level);
-		if (n < 0) {
-			goto klogctl_error;
-		}
-		exit(TRUE);
-	}
+	buf = xmalloc(len);
+	len = klogctl(3 + (opts & OPT_c), buf, len); /* read ring buffer */
+	if (len < 0)
+		bb_perror_msg_and_die("klogctl");
+	if (len == 0)
+		return EXIT_SUCCESS;
 
-	if (bufsize < 4096)
-		bufsize = 4096;
-	buf = (char *) xmalloc(bufsize);
-	n = klogctl(cmd, buf, bufsize);
-	if (n < 0) {
-		goto klogctl_error;
-	}
 
-	lastc = '\n';
-	for (i = 0; i < n; i++) {
-		if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') {
-			i++;
-			while (buf[i] >= '0' && buf[i] <= '9')
-				i++;
-			if (buf[i] == '>')
-				i++;
+	if (ENABLE_FEATURE_DMESG_PRETTY) {
+		int last = '\n';
+		int in = 0;
+
+		/* Skip <#> at the start of lines */
+		while (1) {
+			if (last == '\n' && buf[in] == '<') {
+				in += 3;
+				if (in >= len)
+					break;
+			}
+			last = buf[in];
+			putchar(last);
+			in++;
+			if (in >= len)
+				break;
 		}
-		lastc = buf[i];
-		putchar(lastc);
+		/* Make sure we end with a newline */
+		if (last != '\n')
+			bb_putchar('\n');
+	} else {
+		full_write(STDOUT_FILENO, buf, len);
+		if (buf[len-1] != '\n')
+			bb_putchar('\n');
 	}
-	if (lastc != '\n')
-		putchar('\n');
-	exit(TRUE);
-  end:
-	usage(dmesg_usage);
-	exit(FALSE);
-  klogctl_error:
-	perror("klogctl");
-	return(FALSE);
+
+	if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+
+	return EXIT_SUCCESS;
 }