[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/procps/watch.c b/ap/app/busybox/src/procps/watch.c
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+++ b/ap/app/busybox/src/procps/watch.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini watch implementation for busybox
+ *
+ * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
+ * Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+/* BB_AUDIT SUSv3 N/A */
+/* BB_AUDIT GNU defects -- only option -n is supported. */
+
+//usage:#define watch_trivial_usage
+//usage: "[-n SEC] [-t] PROG ARGS"
+//usage:#define watch_full_usage "\n\n"
+//usage: "Run PROG periodically\n"
+//usage: "\n -n Loop period in seconds (default 2)"
+//usage: "\n -t Don't print header"
+//usage:
+//usage:#define watch_example_usage
+//usage: "$ watch date\n"
+//usage: "Mon Dec 17 10:31:40 GMT 2000\n"
+//usage: "Mon Dec 17 10:31:42 GMT 2000\n"
+//usage: "Mon Dec 17 10:31:44 GMT 2000"
+
+#include "libbb.h"
+
+// procps 2.0.18:
+// watch [-d] [-n seconds]
+// [--differences[=cumulative]] [--interval=seconds] command
+//
+// procps-3.2.3:
+// watch [-dt] [-n seconds]
+// [--differences[=cumulative]] [--interval=seconds] [--no-title] command
+//
+// (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
+
+int watch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int watch_main(int argc UNUSED_PARAM, char **argv)
+{
+ unsigned opt;
+ unsigned period = 2;
+ unsigned width, new_width;
+ char *header;
+ char *cmd;
+
+#if 0 // maybe ENABLE_DESKTOP?
+ // procps3 compat - "echo TEST | watch cat" doesn't show TEST:
+ close(STDIN_FILENO);
+ xopen("/dev/null", O_RDONLY);
+#endif
+
+ opt_complementary = "-1:n+"; // at least one param; -n NUM
+ // "+": stop at first non-option (procps 3.x only)
+ opt = getopt32(argv, "+dtn:", &period);
+ argv += optind;
+
+ // watch from both procps 2.x and 3.x does concatenation. Example:
+ // watch ls -l "a /tmp" "2>&1" - ls won't see "a /tmp" as one param
+ cmd = *argv;
+ while (*++argv)
+ cmd = xasprintf("%s %s", cmd, *argv); // leaks cmd
+
+ width = (unsigned)-1; // make sure first time new_width != width
+ header = NULL;
+ while (1) {
+ /* home; clear to the end of screen */
+ printf("\033[H""\033[J");
+ if (!(opt & 0x2)) { // no -t
+ const unsigned time_len = sizeof("1234-67-90 23:56:89");
+ time_t t;
+
+ // STDERR_FILENO is procps3 compat:
+ // "watch ls 2>/dev/null" does not detect tty size
+ get_terminal_width_height(STDERR_FILENO, &new_width, NULL);
+ if (new_width != width) {
+ width = new_width;
+ free(header);
+ header = xasprintf("Every %us: %-*s", period, (int)width, cmd);
+ }
+ time(&t);
+ if (time_len < width)
+ strftime(header + width - time_len, time_len,
+ "%Y-%m-%d %H:%M:%S", localtime(&t));
+
+ // compat: empty line between header and cmd output
+ printf("%s\n\n", header);
+ }
+ fflush_all();
+ // TODO: 'real' watch pipes cmd's output to itself
+ // and does not allow it to overflow the screen
+ // (taking into account linewrap!)
+ system(cmd);
+ sleep(period);
+ }
+ return 0; // gcc thinks we can reach this :)
+}