* dmesg - display/control kernel ring buffer.
*
* Copyright 2006 Rob Landley <rob@landley.net>
- * Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
+ * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
-#include "busybox.h"
-#include <unistd.h>
#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;
+ char *buf;
char *size, *level;
- int flags = bb_getopt_ulflags(argc, argv, "cs:n:", &size, &level);
+ unsigned flags = getopt32(argv, "cs:n:", &size, &level);
+ enum {
+ OPT_c = 1<<0,
+ OPT_s = 1<<1,
+ OPT_n = 1<<2
+ };
- if (flags & 4) {
- if (klogctl(8, NULL, bb_xgetlarg(level, 10, 0, 10)))
+ if (flags & OPT_n) {
+ if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
bb_perror_msg_and_die("klogctl");
- } else {
- int len;
- char *buf;
+ return EXIT_SUCCESS;
+ }
- len = (flags & 2) ? bb_xgetlarg(size, 10, 2, INT_MAX) : 16384;
- buf = xmalloc(len);
- if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
- bb_perror_msg_and_die("klogctl");
+ len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384;
+ buf = xmalloc(len);
+ len = klogctl(3 + (flags & OPT_c), buf, len);
+ if (len < 0)
+ bb_perror_msg_and_die("klogctl");
+ if (len == 0)
+ return EXIT_SUCCESS;
- // Skip <#> at the start of lines, and make sure we end with a newline.
+ /* Skip <#> at the start of lines, and make sure we end with a newline. */
- if (ENABLE_FEATURE_DMESG_PRETTY) {
- int last = '\n';
- int in;
+ if (ENABLE_FEATURE_DMESG_PRETTY) {
+ int last = '\n';
+ int in = 0;
- for (in = 0; in<len;) {
- if (last == '\n' && buf[in] == '<') in += 3;
- else putchar(last = buf[in++]);
+ do {
+ if (last == '\n' && buf[in] == '<')
+ in += 3;
+ else {
+ last = buf[in++];
+ bb_putchar(last);
}
- if (last != '\n') putchar('\n');
- } else {
- write(1,buf,len);
- if (len && buf[len-1]!='\n') putchar('\n');
- }
-
- if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+ } while (in < len);
+ if (last != '\n')
+ bb_putchar('\n');
+ } else {
+ full_write(STDOUT_FILENO, buf, len);
+ if (buf[len-1] != '\n')
+ bb_putchar('\n');
}
- return 0;
+ if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+
+ return EXIT_SUCCESS;
}