X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=util-linux%2Fdmesg.c;h=0bbc306fca3f312588529f74f97bc2d29f651e58;hb=ae30210d909ba52328385b75891754b0c93ec780;hp=b6c990d99f733e865823bd7b4e6775942dd3f4bd;hpb=9b2297a34e35be143155769a470331af2f2b9330;p=oweals%2Fbusybox.git

diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index b6c990d99..0bbc306fc 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -1,132 +1,54 @@
 /* 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 Fischer <rep.nop@aon.at>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
  */
 
-#include "internal.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-#if __GNU_LIBRARY__ < 5
-
-#ifndef __alpha__
-# define __NR_klogctl __NR_syslog
-#include <sys/syscall.h>
-static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
-#else							/* __alpha__ */
-#define klogctl syslog
-#endif
+#include "busybox.h"
+#include <unistd.h>
+#include <sys/klog.h>
 
-#else
-# include <sys/klog.h>
-#endif
-
-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
-	;
-
-int dmesg_main(int argc, char **argv)
+int dmesg_main(int argc, char *argv[]);
+int dmesg_main(int argc, char *argv[])
 {
-	char *buf;
-	int bufsize = 8196;
-	int i;
-	int 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) {
-			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;
+	char *size, *level;
+	int flags = getopt32(argc, argv, "cs:n:", &size, &level);
+
+	if (flags & 4) {
+		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
+			bb_perror_msg_and_die("klogctl");
+	} else {
+		int len;
+		char *buf;
+
+		len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
+		buf = xmalloc(len);
+		if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
+			bb_perror_msg_and_die("klogctl");
+
+		// Skip <#> at the start of lines, and make sure we end with a newline.
+
+		if (ENABLE_FEATURE_DMESG_PRETTY) {
+			int last = '\n';
+			int in;
+
+			for (in = 0; in<len;) {
+				if (last == '\n' && buf[in] == '<') in += 3;
+				else putchar(last = buf[in++]);
 			}
+			if (last != '\n') putchar('\n');
+		} else {
+			write(1,buf,len);
+			if (len && buf[len-1]!='\n') putchar('\n');
 		}
-	}
-
-	if (argc > 1) {
-		goto end;
-	}
-
-	if (cmd == 8) {
-		n = klogctl(cmd, NULL, level);
-		if (n < 0) {
-			goto klogctl_error;
-		}
-		exit(TRUE);
-	}
 
-	if (bufsize < 4096)
-		bufsize = 4096;
-	buf = (char *) xmalloc(bufsize);
-	n = klogctl(cmd, buf, bufsize);
-	if (n < 0) {
-		goto klogctl_error;
+		if (ENABLE_FEATURE_CLEAN_UP) free(buf);
 	}
 
-	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++;
-		}
-		lastc = buf[i];
-		putchar(lastc);
-	}
-	if (lastc != '\n')
-		putchar('\n');
-	exit(TRUE);
-  end:
-	usage(dmesg_usage);
-	exit(FALSE);
-  klogctl_error:
-	perror("klogctl");
-	return(FALSE);
+	return 0;
 }