From owner-freebsd-hackers  Fri Nov  2  0:23:49 2001
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Date: Fri, 2 Nov 2001 02:23:33 -0600
From: Alfred Perlstein <bright@mu.org>
To: hackers@freebsd.org
Subject: head(1) speedup
Message-ID: <20011102022333.L15052@elvis.mu.org>
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can someone please check this out, it makes "head -n" about five
times faster.  (also nukes a 'register', sorry :))


cvs diff: Diffing .
Index: head.c
===================================================================
RCS file: /home/ncvs/src/usr.bin/head/head.c,v
retrieving revision 1.10
diff -c -r1.10 head.c
*** head.c	28 Aug 1999 01:01:58 -0000	1.10
--- head.c	2 Nov 2001 08:18:07 -0000
***************
*** 131,146 ****
  void
  head(fp, cnt)
  	FILE *fp;
! 	register int cnt;
  {
! 	register int ch;
  
! 	while (cnt && (ch = getc(fp)) != EOF) {
! 			if (putchar(ch) == EOF)
! 				err(1, "stdout");
! 			if (ch == '\n')
! 				cnt--;
! 		}
  }
  
  void
--- 131,147 ----
  void
  head(fp, cnt)
  	FILE *fp;
! 	int cnt;
  {
! 	char *cp;
! 	int error, readlen;
  
! 	while (cnt && (cp = fgetln(fp, &readlen)) != NULL) {
! 		error = fwrite(cp, sizeof(char), readlen, stdout);
! 		if (error != readlen)
! 			err(1, "stdout");
! 		cnt--;
! 	}
  }
  
  void


-- 
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
 start asking why software is ignoring 30 years of accumulated wisdom.'
                           http://www.morons.org/rants/gpl-harmful.php3

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