Converted option parsing to getopt(). Also added some explanatory comments.

1 files changed, 14 insertions, 13 deletions

diff --git a/miscutils/update.c b/miscutils/update.c
index 0bdc90eaa..3f3d68b87 100644
--- a/miscutils/update.c
+++ b/miscutils/update.c
@@ -23,16 +23,22 @@
  *
  */
 
+/*
+ * Note: This program is only necessary if you are running a 2.0.x (or
+ * earlier) kernel. 2.2.x and higher flush filesystem buffers automatically.
+ */
+
 #include "internal.h"
 #include <sys/param.h>
 #include <sys/syslog.h>
+#include <unistd.h> /* for getopt() */
 
 
 #if defined(__GLIBC__)
 #include <sys/kdaemon.h>
 #else
 static _syscall2(int, bdflush, int, func, int, data);
-#endif                                                  /* __GLIBC__ */
+#endif /* __GLIBC__ */
 
 static unsigned int sync_duration = 30;
 static unsigned int flush_duration = 5;
@@ -41,29 +47,22 @@ static int use_sync = 0;
 extern int update_main(int argc, char **argv)
 {
         int pid;
+        int opt;
 
-        argc--;
-        argv++;
-        while (argc>0 && **argv == '-') {
-                while (*++(*argv)) {
-                        switch (**argv) {
+        while ((opt = getopt(argc, argv, "Ss:f:")) > 0) {
+                switch (opt) {
                         case 'S':
                                 use_sync = 1;
                                 break;
                         case 's':
-                                if (--argc < 1) usage(update_usage);
-                                sync_duration = atoi(*(++argv));
+                                sync_duration = atoi(optarg);
                                 break;
                         case 'f':
-                                if (--argc < 1) usage(update_usage);
-                                flush_duration = atoi(*(++argv));
+                                flush_duration = atoi(optarg);
                                 break;
                         default:
                                 usage(update_usage);
-                        }
                 }
-                argc--;
-                argv++;
         }
 
         pid = fork();
@@ -79,6 +78,8 @@ extern int update_main(int argc, char **argv)
                  * This is no longer necessary since 1.3.5x, but it will harmlessly
                  * exit if that is the case.
                  */
+
+                /* set the program name that will show up in a 'ps' listing */
                 argv[0] = "bdflush (update)";
                 argv[1] = NULL;
                 argv[2] = NULL;