factor: fix comments

[oweals/busybox.git] / coreutils / sleep.c

diff --git a/coreutils/sleep.c b/coreutils/sleep.c
index 7e38a366757e2ce103ae5df7a54b237412285a57..ad2d6b526eaedb3f994a2b0a7731c0a98119800c 100644 (file)
--- a/coreutils/sleep.c
+++ b/coreutils/sleep.c
@@ -1,19 +1,154 @@
-#include "internal.h"
-#include <stdio.h>
+/* vi: set sw=4 ts=4: */
+/*
+ * sleep implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
+ *
+ * Rewritten to do proper arg and error checking.
+ * Also, added a 'fancy' configuration to accept multiple args with
+ * time suffixes for seconds, minutes, hours, and days.
+ */
+//config:config SLEEP
+//config:      bool "sleep"
+//config:      default y
+//config:      help
+//config:        sleep is used to pause for a specified number of seconds.
+//config:        It comes in 3 versions:
+//config:        - small: takes one integer parameter
+//config:        - fancy: takes multiple integer arguments with suffixes:
+//config:          sleep 1d 2h 3m 15s
+//config:        - fancy with fractional numbers:
+//config:          sleep 2.3s 4.5h sleeps for 16202.3 seconds
+//config:        Last one is "the most compatible" with coreutils sleep,
+//config:        but it adds around 1k of code.
+//config:
+//config:config FEATURE_FANCY_SLEEP
+//config:      bool "Enable multiple arguments and s/m/h/d suffixes"
+//config:      default y
+//config:      depends on SLEEP
+//config:      help
+//config:        Allow sleep to pause for specified minutes, hours, and days.
+//config:
+//config:config FEATURE_FLOAT_SLEEP
+//config:      bool "Enable fractional arguments"
+//config:      default y
+//config:      depends on FEATURE_FANCY_SLEEP
+//config:      help
+//config:        Allow for fractional numeric parameters.
 
-const char     sleep_usage[] = " NUMBER\n"
-"Pause for NUMBER seconds.\n";
+/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
+//applet:IF_SLEEP(APPLET(sleep, BB_DIR_BIN, BB_SUID_DROP))
 
-extern int
-sleep_main(int argc, char * * argv)
+//kbuild:lib-$(CONFIG_SLEEP) += sleep.o
+
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
+
+//usage:#define sleep_trivial_usage
+//usage:       IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
+//usage:#define sleep_full_usage "\n\n"
+//usage:       IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
+//usage:       IF_FEATURE_FANCY_SLEEP(
+//usage:       "Pause for a time equal to the total of the args given, where each arg can\n"
+//usage:       "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
+//usage:
+//usage:#define sleep_example_usage
+//usage:       "$ sleep 2\n"
+//usage:       "[2 second delay results]\n"
+//usage:       IF_FEATURE_FANCY_SLEEP(
+//usage:       "$ sleep 1d 3h 22m 8s\n"
+//usage:       "[98528 second delay results]\n")
+
+#include "libbb.h"
+
+#if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
+static const struct suffix_mult sfx[] = {
+       { "s", 1 },
+       { "m", 60 },
+       { "h", 60*60 },
+       { "d", 24*60*60 },
+       { "", 0 }
+};
+#endif
+
+int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sleep_main(int argc UNUSED_PARAM, char **argv)
 {
-        if ( (argc < 2) || (**(argv+1) == '-') ) {
-           usage( sleep_usage );
+#if ENABLE_FEATURE_FLOAT_SLEEP
+       double duration;
+       struct timespec ts;
+#else
+       unsigned duration;
+#endif
+
+       ++argv;
+       if (!*argv)
+               bb_show_usage();
+
+#if ENABLE_FEATURE_FLOAT_SLEEP
+
+# if ENABLE_LOCALE_SUPPORT
+       /* undo busybox.c setlocale */
+       setlocale(LC_NUMERIC, "C");
+# endif
+       duration = 0;
+       do {
+               char *arg = *argv;
+               if (strchr(arg, '.')) {
+                       double d;
+                       char *pp;
+                       int len = strspn(arg, "0123456789.");
+                       char sv = arg[len];
+                       arg[len] = '\0';
+                       errno = 0;
+                       d = strtod(arg, &pp);
+                       if (errno || *pp)
+                               bb_show_usage();
+                       arg += len;
+                       *arg-- = sv;
+                       sv = *arg;
+                       *arg = '1';
+                       duration += d * xatoul_sfx(arg, sfx);
+                       *arg = sv;
+               } else {
+                       duration += xatoul_sfx(arg, sfx);
+               }
+       } while (*++argv);
+
+       ts.tv_sec = MAXINT(typeof(ts.tv_sec));
+       ts.tv_nsec = 0;
+       if (duration >= 0 && duration < ts.tv_sec) {
+               ts.tv_sec = duration;
+               ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
        }
+       do {
+               errno = 0;
+               nanosleep(&ts, &ts);
+       } while (errno == EINTR);
+
+#elif ENABLE_FEATURE_FANCY_SLEEP
+
+       duration = 0;
+       do {
+               duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
+       } while (*++argv);
+       sleep(duration);
+
+#else /* simple */
+
+       duration = xatou(*argv);
+       sleep(duration);
+       // Off. If it's really needed, provide example why
+       //if (sleep(duration)) {
+       //      bb_perror_nomsg_and_die();
+       //}
+
+#endif
 
-       if ( sleep(atoi(*(++argv))) != 0 ) {
-               perror( "sleep");
-               exit (FALSE);
-       } else
-               exit (TRUE);
+       return EXIT_SUCCESS;
 }