getpot: add support for "a+" specifier for nonnegative int parameters.

By Vladimir Dronnikov <dronnikov at gmail.com>.
fdisk and top are converted as an example.

function                                             old     new   delta
getopt32                                            1340    1370     +30
top_main                                            1137    1120     -17
fdisk_main                                          3033    2949     -84
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 30/-101)           Total: -71 bytes

1 files changed, 3 insertions, 6 deletions

diff --git a/procps/top.c b/procps/top.c
index 4df58f227..37b6a0cdb 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -740,7 +740,7 @@ int top_main(int argc, char **argv)
         int count, lines, col;
         unsigned interval;
         int iterations;
-        char *sinterval, *siterations;
+        char *sinterval;
         SKIP_FEATURE_TOPMEM(const) unsigned scan_mask = TOP_MASK;
 #if ENABLE_FEATURE_USE_TERMIOS
         struct termios new_settings;
@@ -757,15 +757,12 @@ int top_main(int argc, char **argv)
         iterations = 0; /* infinite */
 
         /* do normal option parsing */
-        opt_complementary = "-";
-        getopt32(argv, "d:n:b", &sinterval, &siterations);
+        opt_complementary = "-:n+";
+        getopt32(argv, "d:n:b", &sinterval, &iterations);
         if (option_mask32 & 0x1) {
                 /* Need to limit it to not overflow poll timeout */
                 interval = xatou16(sinterval); // -d
         }
-        if (option_mask32 & 0x2)
-                iterations = xatoi_u(siterations); // -n
-        //if (option_mask32 & 0x4) // -b
 
         /* change to /proc */
         xchdir("/proc");