- add seq -w support (Natanael Copa)

1 files changed, 11 insertions, 4 deletions

diff --git a/coreutils/seq.c b/coreutils/seq.c
index 01d71f256..899cd696b 100644
--- a/coreutils/seq.c
+++ b/coreutils/seq.c
@@ -16,23 +16,30 @@ int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int seq_main(int argc, char **argv)
 {
         double last, increment, i;
+        enum { OPT_w = 1 };
+        unsigned opt = getopt32(argv, "+w");
+        unsigned width = 0;
 
+        argc -= optind;
+        argv += optind;
         i = increment = 1;
         switch (argc) {
-                case 4:
-                        increment = atof(argv[2]);
                 case 3:
-                        i = atof(argv[1]);
+                        increment = atof(argv[1]);
                 case 2:
+                        i = atof(*argv);
+                case 1:
                         last = atof(argv[argc-1]);
                         break;
                 default:
                         bb_show_usage();
         }
+        if (opt & OPT_w) /* Pad to length of start or last */
+                width = MAX(strlen(*argv), strlen(argv[argc-1]));
 
         /* You should note that this is pos-5.0.91 semantics, -- FK. */
         while ((increment > 0 && i <= last) || (increment < 0 && i >= last)) {
-                printf("%g\n", i);
+                printf("%0*g\n", width, i);
                 i += increment;
         }