ts: new applet

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/miscutils/ts.c b/miscutils/ts.c
new file mode 100644
index 000000000..4a02341cc
--- /dev/null
+++ b/miscutils/ts.c
@@ -0,0 +1,88 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2006  Michael Opdenacker <michael@free-electrons.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config TS
+//config:       bool "ts (450 bytes)"
+//config:       default y
+
+//applet:IF_TS(APPLET(ts, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_TS) += ts.o
+
+//usage:#define ts_trivial_usage
+//usage:       "[-is] [STRFTIME]"
+//usage:#define ts_full_usage ""
+
+#include "libbb.h"
+#include "common_bufsiz.h"
+# include <sys/syscall.h>
+
+int ts_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ts_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+        struct timespec base;
+        unsigned opt;
+        char *frac;
+        char *fmt_dt2str;
+        char *line;
+
+        opt = getopt32(argv, "^" "is" "\0" "?1" /*max one arg*/);
+        if (opt) {
+                putenv((char*)"TZ=UTC0");
+                tzset();
+        }
+        /*argc -= optind;*/
+        argv += optind;
+        fmt_dt2str = argv[0] ? argv[0]
+                : (char*)(opt ? "%b %d %H:%M:%S"+6 : "%b %d %H:%M:%S");
+        frac = is_suffixed_with(fmt_dt2str, "%.S");
+        if (!frac)
+                frac = is_suffixed_with(fmt_dt2str, "%.s");
+        if (frac) {
+                frac++;
+                strcpy(frac, frac + 1);
+        }
+
+#define date_buf bb_common_bufsiz1
+        setup_common_bufsiz();
+        syscall(__NR_clock_gettime, CLOCK_REALTIME, &base);
+
+        while ((line = xmalloc_fgets(stdin)) != NULL) {
+                struct timespec ts;
+                struct tm tm_time;
+
+                /* libc has incredibly messy way of doing this,
+                 * typically requiring -lrt. We just skip all this mess
+                 */
+                syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
+                if (opt) {
+                        /* -i and/or -s */
+                        struct timespec ts1 = ts1;
+                        if (opt & 1) /* -i */
+                                ts1 = ts;
+//printf("%d %d\n", ts.tv_sec, base.tv_sec);
+                        ts.tv_sec -= base.tv_sec;
+//printf("%d %d\n", ts.tv_sec, base.tv_sec);
+                        ts.tv_nsec -= base.tv_nsec;
+                        if ((int32_t)(ts.tv_nsec) < 0) {
+                                ts.tv_sec--;
+                                ts.tv_nsec += 1000*1000*1000;
+                        }
+                        if (opt & 1) /* -i */
+                                base = ts1;
+                        localtime_r(&ts.tv_sec, &tm_time);
+                }
+                strftime(date_buf, COMMON_BUFSIZE, fmt_dt2str, &tm_time);
+                if (!frac) {
+                        printf("%s %s", date_buf, line);
+                } else {
+                        printf("%s.%06u %s", date_buf, (unsigned)ts.tv_nsec / 1000u, line);
+                }
+                free(line);
+        }
+
+        return EXIT_SUCCESS;
+}