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[ID 20001112.007] sfio's sftell isn't ftell
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From:
Nicholas Clark
Date:
November 12, 2000 14:40
Subject:
[ID 20001112.007] sfio's sftell isn't ftell
Message ID:
E13v4bH-0000lN-00@Bagpuss.unfortu.net
This is a bug report for perl from nick@talking.bollo.cx,
generated with the help of perlbug 1.32 running under perl v5.7.0.
-----------------------------------------------------------------
[Please enter your report here]
sfio's sftell() isn't ftell(). For an unseekable file it returns number
of bytes read/written, rather than -1.
sfio's stdio emulation for ftell is
return (long)sfseek(sf, (Sfoff_t)0, SEEK_CUR|SF_SHARE);
which does behave in the expected stdio fashion.
(sfio documentation states SF_SHARE ensures an lseek() to verifiy that the
file position is valid)
With the following patch
--- perlsfio.h.orig Tue Oct 24 19:58:50 2000
+++ perlsfio.h Sun Nov 12 19:19:26 2000
@@ -35,7 +35,7 @@
#define PerlIO_fileno(f) sffileno(f)
#define PerlIO_clearerr(f) sfclrerr(f)
#define PerlIO_flush(f) sfsync(f)
-#define PerlIO_tell(f) sftell(f)
+#define PerlIO_tell(f) sfseek(f,0,1|SF_SHARE)
#define PerlIO_seek(f,o,w) sfseek(f,o,w)
#define PerlIO_rewind(f) (void) sfseek((f),0L,0)
#define PerlIO_tmpfile() sftmp(0)
perl compiled with sfio returns -1 for tell STDIN where STDIN is a tty,
just like perl with stdio.
All regression tests pass. [and always did :-(]
Nicholas Clark
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=low
---
Site configuration information for perl v5.7.0:
Configured by nick at Sat Oct 21 11:14:10 BST 2000.
Summary of my perl5 (revision 5.0 version 7 subversion 0) configuration:
Platform:
osname=linux, osvers=2.2.17-rmk1, archname=armv4l-linux-64int
uname='linux bagpuss.unfortu.net 2.2.17-rmk1 #5 mon sep 18 19:03:46 bst 2000 armv4l unknown '
config_args=''
hint=previous, useposix=true, d_sigaction=define
usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
useperlio=define d_sfio=define uselargefiles=define usesocks=undef
use64bitint=define use64bitall=undef uselongdouble=undef
Compiler:
cc='/usr/local/bin/gcc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2',
cppflags='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
ccversion='', gccversion='2.95.2 20000516 (release) [Rebel.com]', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=8
ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=4, usemymalloc=n, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lsfio -lnsl -lndbm -ldb -ldl -lm -lc -lposix -lcrypt -lutil
perllibs=-lsfio -lnsl -ldl -lm -lc -lposix -lcrypt -lutil
libc=/lib/libc-2.1.3.so, so=so, useshrplib=false, libperl=libperl.a
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'
Locally applied patches:
DEVEL7385
---
@INC for perl v5.7.0:
/usr/local/lib/perl5/5.7.0/armv4l-linux
/usr/local/lib/perl5/5.7.0
/usr/local/lib/perl5/site_perl/5.7.0/armv4l-linux
/usr/local/lib/perl5/site_perl/5.7.0
/usr/local/lib/perl5/site_perl
.
---
Environment for perl v5.7.0:
HOME=/home/nick
LANG (unset)
LANGUAGE (unset)
LC_CTYPE=en_GB.ISO-8859-1
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/nick/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/sbin:/usr/sbin:/usr/local/sbin
PERL_BADLANG (unset)
SHELL=/bin/bash
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[ID 20001112.007] sfio's sftell isn't ftell
by Nicholas Clark