B20.1: Cat-to-screen bug in bash shell (Win 95).

Mon Nov 22 12:22:00 GMT 1999

Problem Description:
 I am running Cygwin B20.1 (1/15/99 cygwin DLL snapshot) bash under Win 95, and have problems
"catting" files to the screen (which is a DOS box). For example, a 9-line file will cat correctly 3
times in a row, then on the 4th try leave out some characters, then on the 5th try get it right
again. The problem is exacerbated when I run Charles Wilson's "consize" utility to increase the
line history buffer, but appears without it; see below. The source file, an example session, and
the output of cygcheck are edited in following. Can you give me any hints on what's wrong, and how
to fix it? 
 Garrett Sylvester
 gsylvester@gdats.com
===============================================================
Copy of 9-line file used to exhibit screen-display problem follows. File begins with
"/* printIt"... and ends with ..."buffer[256]".
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line, page;
	char buffer[256];
==========================================================================================
Text of CygWin bash session illustrating (one aspect of) screen display problem follows.
In summary, 9-line text file shown above is successfully catted to screen 3 times in a row,
then the cat has an error on the fourth try, and it returns to nominal on the fifth and
last. Lines that are indented and parenthesized are comments interpolated later to highlight
what the problem is. Note that original file as pasted in above contains a tab character
at beginning of last line, just prior to phrase "char buffer[256]". For some reason, this
character is reproduced below as a sequence of spaces.
BASH.EXE-2.02$ cd /E/Compiler/CygWin/GSSCodes
 (Change to directory with example file.)
BASH.EXE-2.02$ cat frontOfPrintIt.txt
 (Cat example file to screen for first time. Printout is nominal.)
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line, page;
 char buffer[256];
BASH.EXE-2.02$ cat frontOfPrintIt.txt
 (Cat example file to screen for second time. Printout is nominal.)
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line, page;
 char buffer[256];
BASH.EXE-2.02$ cat frontOfPrintIt.txt
 (Cat example file to screen for third time. Printout is nominal.)
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line, page;
 char buffer[256];
BASH.EXE-2.02$ cat frontOfPrintIt.txt
 (Cat example file to screen for fourth time. Printout is wrong: everything from and 
 including the comma in line 8 through the tab in line 9 has gone to bit heaven.)
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int linechar buffer[256];
BASH.EXE-2.02$ cat frontOfPrintIt.txt
 (Cat example file to screen for fifth time. Printout is right again.)
/* printIt: This program lists a file to the screen, adding line numbers. */
/* Usage: printIt filename */
#include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line, page;
 char buffer[256];
BASH.EXE-2.02$
=========================================================================
Output of cygcheck -s -v -r follows.
Cygnus Win95/NT Configuration Diagnostics
Current System Time: Mon Nov 22 14:39:52 1999
Win95 Ver 4.0 build 67306684 B
Path:	.
	/E/COMPILER/CYGWIN/CYGWIN~1/H-I586~1/BIN
	/E/COMPILER/CYGWIN/CYGWIN~1/H-I586~1/USR/LOCAL/BIN
	/E/MATH/MATLAB~2/BIN
	/C/TNGSD/BIN
	/C/WINDOWS
	/C/WINDOWS/COMMAND
	/E/COMPILER/WATCOMCC/BINNT
	/E/COMPILER/WATCOMCC/BINW
	/E/COMPILER/MS_IDE
	/C/APPS/ANTIVI~1/MCAFEE
SysDir: C:\WINDOWS\SYSTEM
WinDir: C:\WINDOWS
HOME = `/home'
MAKE_MODE = `UNIX'
PWD = `/E/Compiler/CygWin/GSSCodes'
!C: = `C:\WINDOWS\DESKTOP'
!E: = `E:\COMPILER\CYGWIN\CYGWIN~1'
ASMROOT = `C:\TNGSD\SD'
BLASTER = `A220 I2 D1 T4'
CMDLINE = `bash'
COMSPEC = `C:\COMMAND.COM'
EDPATH = `E:\Compiler\WatcomCC\EDDAT'
HOSTNAME = `garrett_mobile.gdats.com'
HOSTTYPE = `i586'
INCLUDE = `E:\Compiler\WatcomCC\H;E:\Compiler\WatcomCC\H\NT'
MACHTYPE = `i586-pc-cygwin32'
OSTYPE = `cygwin32'
PROMPT = `$p$g'
SHELL = `/bin/sh'
SHLVL = `1'
TEMP = `C:\WINDOWS\TEMP'
TERM = `cygwin'
TMP = `C:\WINDOWS\TEMP'
WATCOM = `E:\Compiler\WatcomCC'
WINBOOTDIR = `C:\WINDOWS'
WINDIR = `C:\WINDOWS'
WWINHELP = `H:\BINW'
_ = `/E/COMPILER/CYGWIN/CYGWIN~1/H-I586~1/BIN/cygcheck'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Favorites\Engineering
\CompSci\Cygnus
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Favorites\Engineering
\CompSci\Cygnus\Menu
 (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts00円
 (default) = `F:'
 unix = `/F'
 fbinary = 0x00000000
 fsilent = 0x00000000
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts01円
 (default) = `E:'
 unix = `/E'
 fbinary = 0x00000000
 fsilent = 0x00000000
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts02円
 (default) = `D:'
 unix = `/D'
 fbinary = 0x00000000
 fsilent = 0x00000000
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts03円
 (default) = `C:'
 unix = `/C'
 fbinary = 0x00000000
 fsilent = 0x00000000
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts04円
 (default) = `E:\Compiler\CygWin\cygwin-b20\H-i586-cygwin32'
 unix = `/'
 fbinary = 0x00000000
 fsilent = 0x00000000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Cygnus Cygwin B20
 (default) = `C:\WINDOWS\IsUninst.exe -fe:\compiler\cygwin\cygwin-b20\Uninst.isu'
 DisplayName = `Cygwin B20'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin B20
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin B20\B20.1
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32\i586-cygwin32
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32\i586-cygwin32\cygwin-B20.1
 (default) = `e:\compiler\cygwin\cygwin-b20'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts00円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts01円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts02円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts03円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts04円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts05円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts06円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts07円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts08円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts09円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円A
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円B
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円C
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円D
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円E
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts0円F
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts10円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts11円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts12円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts13円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts14円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts15円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts16円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts17円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts18円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts19円
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts1円A
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts1円B
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts1円C
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts1円D
a:\ fd N/A N/A 
c:\ hd FAT32 992Mb 60% CP UN BOOT
d:\ hd FAT32 765Mb 38% CP UN WORK
e:\ hd FAT32 1675Mb 66% CP UN APPS
f:\ hd FAT32 4359Mb 82% CP UN DATA
g:\ cd N/A N/A 
E:\Compiler\CygWin\cygwin-b20\H-i586-cygwin32 / native text!=binary
C: /C native text!=binary
D: /D native text!=binary
E: /E native text!=binary
F: /F native text!=binary
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\bash.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cat.exe
Not Found: cpp (good!)
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\find.exe
Found: C:\WINDOWS\COMMAND\find.exe
Warning: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\find.exe hides C:\WINDOWS\COMMAND\find.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\gcc.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\gdb.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\ld.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\ls.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\make.exe
Found: E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\sh.exe
 371k 1998年12月01日 E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cygtcl80.dll - os=4.0 img=1.0 sys=4.0
 "cygtcl80.dll" v0.0 ts=1998年12月1日 3:25
 5k 1998年12月01日 E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cygtclpip80.dll - os=4.0 img=1.0 sys=4.0
 10k 1998年12月01日 E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cygtclreg80.dll - os=4.0 img=1.0 sys=4.0
 "cygtclreg80.dll" v0.0 ts=1998年12月1日 3:25
 600k 1998年12月01日 E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cygtk80.dll - os=4.0 img=1.0 sys=4.0
 "cygtk80.dll" v0.0 ts=1998年12月1日 3:28
 451k 1999年11月19日 E:\COMPILER\CYGWIN\CYGWIN~1\H-I586~1\BIN\cygwin1.dll - os=4.0 img=1.0 sys=4.0
 "cygwin1.dll" v0.0 ts=1999年1月16日 0:09
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