Path: utzoo!mnetor!tmsoft!mason
From: mason@tmsoft.uucp (Dave Mason)
Newsgroups: comp.sources.d
Subject: v06i100: Count program - leading zero enhancement
Message-ID: <1989May16.000313.8145@tmsoft.uucp>
Date: 16 May 89 00:03:13 GMT
References: <54804@uunet.UU.NET>
Reply-To: mason@tmsoft.UUCP (Dave Mason)
Followup-To: comp.sources.d
Organization: TM Software Associates, Toronto
Lines: 78

In article <54804@uunet.UU.NET> Jeff Beadles <jeff@quark.wv.tek.com>
gives us the classic little hack.  It's beautiful.  3 lines changed
and it now gives leading zeros useful for filenames.  (Note this may
not work on really old printf's.  I wasn't willing to add the 2 other
lines required to make it work everywhere.)
	../Dave

*** count.1.orig	Mon May 15 19:38:00 1989
--- count.1	Mon May 15 19:54:37 1989
***************
*** 27,31 ****
--- 27,35 ----
  .I 040
  ) between each number.
  
+ Leading zeros on the
+ .I Start
+ value will be reflected in the generated numbers.
  .SH AUTHOR
  Jeff Beadles	jeff@quark.WV.TEK.COM
+ Dave Mason	mason@tmsoft	(leading zeros hack)
*** count.c.orig	Mon May 15 19:38:02 1989
--- count.c	Mon May 15 19:55:28 1989
***************
*** 16,21 ****
--- 16,30 ----
   *
   */
  
+ /*	Great program!  Hacked by Dave Mason <mason@tmsoft> 890515 to:
+  *	Add leading zeros (string will always be at least as long as
+  *	the lower limit).  E.g.:
+  *		count 05 7
+  *	will produce:
+  *		05
+  *		06
+  *		07
+  */
  
  #include <stdio.h>
  #include <ctype.h>
***************
*** 37,42 ****
--- 46,52 ----
  	void usage();
  	int oatc();
  	int	start = 0;	/* Start count				*/
+ 	int	len;		/* Minimum length			*/
  	int	stop  = 0;	/* Stop  count				*/
  	int	pos   = 1;	/* Position in command line for parsing	*/
  	char	fs    = FS;	/* Field Separator			*/
***************
*** 51,56 ****
--- 61,67 ----
  			fs = argv[1][1];
  		pos++;		/* On to the next arg... */
  	}
+ 	len   = strlen(argv[pos]);	/* Minimum length */
  	start = atoi(argv[pos++]);	/* Start here, and... */
  
  	if ( argc <= pos)
***************
*** 67,73 ****
     Yes, this is it.  It even prints a '\n' when done, if the fs != '\n' (Wow)
   */
  	while ( start <= stop )
! 		printf("%d%c",start++,( (start != stop) ? fs : '\n' ) );
  }
  
  /*
--- 78,84 ----
     Yes, this is it.  It even prints a '\n' when done, if the fs != '\n' (Wow)
   */
  	while ( start <= stop )
! 		printf("%.*d%c",len,start++,( (start != stop) ? fs : '\n' ) );
  }
  
  /*