Date: Mon, 26 Feb 1996 09:08:49 +0200 (SAT) From: R Bezuidenhout <rbezuide@mikom.csir.co.za> To: hackers@freebsd.org Subject: Extra entry with /usr/bin/head ?? Message-ID: <199602260708.JAA02345@zibbi.mikom.csir.co.za>
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Hi all ...
I have been experiencing the following "problem" with head in FreeBSD
2.1-STABLE.
Head has the option -n for specifying the number of lines to scan, but
the following happens.
> head -n 1
YES
YES
h <- head wants an extra entry here before returning ?
>
This is the same with every number you give head.
I had a look in the source code and made the following change
which changes the sequence of tests in the while statement.
This will cause head to first check the count and then get
the next line of characters and not cause it to first get
the characters even if the count (cnt) has become 0.
Thanx ...
*** /usr/src/usr.bin/head/head.c Mon Aug 28 07:36:45 1995
--- ./head.c Mon Feb 26 08:55:39 1996
***************
*** 113,119 ****
{
register int ch;
! while ((ch = getc(fp)) != EOF && cnt) {
if (putchar(ch) == EOF)
err(1, "stdout: %s", strerror(errno));
if (ch == '\n')
--- 113,119 ----
{
register int ch;
! while (cnt && (ch = getc(fp)) != EOF) {
if (putchar(ch) == EOF)
err(1, "stdout: %s", strerror(errno));
if (ch == '\n')
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