V61%DHDURZ1.BITNET@cunyvm.cuny.edu (Ronald Lamprecht) (06/27/89)
Included are new versions of fdopen.c,fflush.c,fgetc.c,fopen.c,fputc.c,
freopen.c,prints.c and a patch for stdio.h which add r+,w+,a+ modes,
correct the append mode and flush the write buffers on every newline char.:
Mode Create Trunc Read Write Append
"r" no no yes no no
"w" yes yes no yes no
"a" yes no no no yes
"r+" no no yes yes no
"w+" yes no yes yes no
"a+" yes no yes no yes
The new version is hacked together from the PC version 1.3 including the
following patches and comments:
- Minor bugs in Atari ST minix library by Jwahar R. Bammi 27 Oct 88
- Minix/ST getc bug + fix by Frans Meulenbroeks 31 Oct 88
- fopen/fclose bug + fix by Frans Meulenbroeks 11 Nov 88
- new and improved freopen.c (I hope) by Frans Meulenbroeks 11 Nov 88
- Re: new and improved freopen.c (I hope) by Brian Katzung 14 Nov 88
- Re: new and improved freopen.c (I hope) by Frans Meulenbroeks 18 Nov 88
- flushing stdandard io streams by Martin Leisner 28 Feb 89
Additionally I have modified prints.c, which issued a direct write call
without previously flushing the buffer:
putchar('a');prints("b"); result: ba !!
Furthermore I eliminated the limit of a maximum of 128 characters per prints
call.
What remains to be done: totally new f* routines which are much faster (fread,
fwrite still call fgetc res. fputc once for every byte !!) and with a better
error handling.
ST: - the Makefile should be modified according to the official updates
(getc -> fgetc, putc -> fputc)
- fcntl.h is included (from PC version 1.3)
- fseek.c is included (slightly improved PC version 1.3)
(the ST version contains a bug reported by F.Meulenbroeks 11 Nov 88)
The files are tared, compressed and uuencoded.(Sorry, but I'm on EBCDIC-Bitnet)
Bitnet: V61@DHDURZ1 Ronald Lamprecht
UUCP: ...!unido!DHDURZ1.bitnet!V61 Theoretische Physik
ARPAnet: V61%DHDURZ1.BITNET@CUNYVM.CUNY.EDU (Heidelberg, West Germany)
--------------------------------cut here------------------------------------
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end
--------------------------------end-----------------------------------------culberts@hpccc.HP.COM (Bruce Culbertson) (07/21/89)
I think there are some incompatibilities between the recently posted
buffered I/O library routines and the ones I have used on BSD and
System V Unix. In my experience, buffered files are flushed
1) when their buffers fill,
2) when explicitly flushed with a call to fflush(),
3) when the file is closed,
4) when the process calls exit(), and
5) if stdin is read, stdout is flushed.
Unfortunately, I cannot seem to find a description of this in my
Unix documentation. Perhaps someone else will find the documentation
and comment.
The new routines differ in the following ways:
A) Stdout is not flushed when stdin is read.
B) Stdout is flushed on all (f)printf's to stdout.
C) Stdout is flushed after all newlines are written to stdout.
Problem A breaks several applications which perform fine on various
Unix systems. The problem is not apparent if prompts for interactive
input are written with (f)printf because of B. However, if a prompt is
written with (f)putc or fwrite, it never appears. B and C are merely
performance issues, but perhaps are worth considering since stdio
exists solely to improve performance. After implementing 5, I had
no further trouble with the new routines. Having the "+" options
in fopen is a nice improvement.
------------------------------------------------------------------
/* 17 Jun 89 r+,w+,a+ added RAL */
#include <stdio.h>
fgetc(iop)
FILE *iop;
{
int ch;
if ( testflag(iop, (_EOF | _ERR )))
return (EOF);
if (iop == stdin && stdout->_count > 0)
fflush (stdout);
if ( !testflag(iop, READMODE) ) {
if (!testflag(iop, RDWRMODE))
return (EOF);
fflush(iop);
iop->_count = 0;
iop->_ptr = iop->_buf;
iop->_flags &= ~WRITEMODE;
iop->_flags |= READMODE;
}
if (iop->_count <= 0){
if ( testflag(iop, UNBUFF) )
iop->_count = read(iop->_fd,&ch,1);
else
iop->_count = read(iop->_fd,iop->_buf,BUFSIZ);
if (iop->_count <= 0){
if (iop->_count == 0)
iop->_flags |= _EOF;
else
iop->_flags |= _ERR;
return (EOF);
}
else
iop->_ptr = iop->_buf;
}
iop->_count--; /* account one char */
if (testflag(iop,UNBUFF))
return (ch & CMASK);
else
return (*iop->_ptr++ & CMASK);
}AJB@dlvh.daresbury.ac.uk (10/23/90)
I noticed in patching BISON for GNUC on the ST that the following code
segment doesn't work on either the ACK or GNUC (or PC?) compilers.
FILE *fp;
char line[10];
fp = fopen("anyfile","w+");
fprintf(fp,"Hello\nWorld\n");
rewind(fp);
fgets(line,10,fp);
printf("%s",line);
You definitely end up with a file containing the requisite text but the
rewind doesn't work (which is not surprising looking at fopen.c) hence
no 'Hello' is printed.
To get bison to work I had to fclose(fp) and fopen() with "r" in place of
the rewind().
BEWARE! the man pages I have says 'w+' is a valid option.
Alan Bleasby
SERC Daresbury Laboratory
Daresbury
Warrington UK
Email: AJB@UK.AC.DARESBURY.DLVHcechew@bruce.cs.monash.OZ.AU (Earl Chew) (10/25/90)
In <34240@nigel.ee.udel.edu> AJB@dlvh.daresbury.ac.uk writes: >BEWARE! the man pages I have says 'w+' is a valid option. Use estdio. Earl -- Earl Chew, Dept of Computer Science, Monash University, Australia 3168 EMAIL: cechew@bruce.cs.monash.edu.au PHONE: 03 5655447 FAX: 03 5655146 ----------------------------------------------------------------------
eesrajm@cc.brunel.ac.uk (Andrew J Michael) (03/17/91)
Would one of the POSIX police please let me know what the current state of thinking is with regard to the access mods for fopen() ? I am particularly interested in the use of the 'b' flag. This is obviously meaningless to MINIX/UNIX, but what should be done with it ? Should it be silently ignored, or flagged as an error ? Andy Michael -- Andy Michael "You might think that. I 85 Hawthorne Crescent couldn't possibly comment." West Drayton - `House of Cards' Middlesex email: eesrajm@brunel.ac.uk UB7 9PA or Andrew.Michael@brunel.ac.uk
waltje@uwalt.nl.mugnet.org (Fred 'The Rebel' van Kempen) (03/22/91)
eesrajm@cc.brunel.ac.uk (Andrew J Michael) wrote: > > Would one of the POSIX police please let me know what the current state of > thinking is with regard to the access mods for fopen() ? I am just a programmer, but: Estdio(3) does it correctly. Use it, and Be Happy :-) > I am particularly interested in the use of the 'b' flag. This is obviously > meaningless to MINIX/UNIX, but what should be done with it ? Should it > be silently ignored, or flagged as an error ? It means "binary open" (as you probably know), and it mainly causes the stdio functions to: - not treat byte 0xFF as EOF ( == -1 !) - not perform any data conversion Again, Estdio does the job well... Fred. -- MicroWalt Corporation, for MINIX Development waltje@uwalt.nl.mugnet.org Tel (+31) 252 230 205, Hoefbladhof 27, 2215 DV VOORHOUT, The Netherlands