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From: Peter Schmid <schmid@snake.iap.physik.tu-darmstadt.de> To: gcc-gnats@gcc.gnu.org Subject: libstdc++/6750: ofstream incorrectly sets failbit (severe regression) Date: Mon, 20 May 2002 13:36:00 -0000 [thread overview] Message-ID: <200205202032.WAA14121@snake.iap.physik.tu-darmstadt.de> (raw) >Number: 6750 >Category: libstdc++ >Synopsis: ofstream incorrectly sets failbit (severe regression) >Confidential: no >Severity: critical >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Mon May 20 13:36:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Peter Schmid >Release: 3.1.1 20020519 (prerelease) >Organization: TU Darmstadt >Environment: System: Linux kiste 2.4.18 #8 Sat Mar 9 15:33:15 CET 2002 i686 unknown Architecture: i686 SuSE 7.3 binutils 20020428 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads=posix --enable-languages=c,c++,f77,objc >Description: Today I encountered a severe regression on the branch. When I ran the following program tio, compiled by gcc 3.1 20020519, the contents of the file tio.dat is truncated. When I type a carriage return on the keyboard as input for the second getline call the output file stream sets erroneously the fail bit when written to. The following writes are missing from the output file. This is a severe regression from gcc 2.95.3. I makes no difference whether the input is read from a file via file descriptor redirection or typed on the keyboard. >How-To-Repeat: source code tio.C #include <iostream> #include <fstream> #define OUTPUT_FILE "tio.dat" #define BUFFSIZ 2048 int main() { using namespace std; char buff[BUFFSIZ]; ofstream output(OUTPUT_FILE, ios::out); if(!output) { cerr << "Cannot create " << OUTPUT_FILE << endl; exit(1); } cout << "Output file will be '" << OUTPUT_FILE << "'." << endl; cout<<"rdstate before reading from cin: " << cin.rdstate() << endl; cout<<"good eof fail bad " << ios::goodbit << " " << ios::eofbit << " " << ios::failbit << " " << ios::badbit << endl; cout << "Enter line 1 of 3: "; cin.getline(buff, BUFFSIZ); output << buff << endl; cerr << "cin state: " << cin.rdstate() << endl; cerr << "output state: " << output.rdstate() << endl; cout << "Enter line 2 of 3: "; cin.getline(buff, BUFFSIZ); output << buff << endl; cerr << "cin state: " << cin.rdstate() << endl; cerr << "output state: " << output.rdstate() << endl; cout << "Enter line 3 of 3: "; cin.getline(buff, BUFFSIZ); output << buff << endl; cerr << "cin state: " << cin.rdstate() << endl; cerr << "output state: " << output.rdstate() << endl; } g++ -v -o tio tio.C -W -Wall Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/specs Configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads=posix --enable-languages=c,c++,f77,objc Thread model: posix gcc version 3.1.1 20020519 (prerelease) /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=1 -D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ tio.C -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase tio.C -W -Wall -version -o /tmp/ccQLkRS9.s GNU CPP version 3.1.1 20020519 (prerelease) (cpplib) (i386 Linux/ELF) GNU C++ version 3.1.1 20020519 (prerelease) (i686-pc-linux-gnu) compiled by GNU C version 3.1.1 20020519 (prerelease). ignoring nonexistent directory "NONE/include" ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include/g++-v3 /usr/local/include/g++-v3/i686-pc-linux-gnu /usr/local/include/g++-v3/backward /usr/local/include /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/include /usr/include End of search list. /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/../../../../i686-pc-linux-gnu/bin/as -V -Qy -o /tmp/ccSA70i7.o /tmp/ccQLkRS9.s GNU assembler version 020428 (i686-pc-linux-gnu) using BFD version 020428 20020428 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o tio /usr/lib/crt1.o /usr/lib/crti.o /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/crtbegin.o -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1 -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/../../../../i686-pc-linux-gnu/lib -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/../../.. /tmp/ccSA70i7.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1.1/crtend.o /usr/lib/crtn.o gcc 3.1 ./tio Output file will be 'tio.dat'. rdstate before reading from cin: 0 good eof fail bad 0 2 4 1 Enter line 1 of 3: Hallo cin state: 0 output state: 0 Enter line 2 of 3: //return key pressed cin state: 0 output state: 1 Enter line 3 of 3: Peter! cin state: 0 output state: 1 cat tio.dat Hallo gcc 2.95.3 ./tio Output file will be 'tio.dat'. rdstate before reading from cin: 0 good eof fail bad 0 1 2 4 Enter line 1 of 3: Hallo cin state: 0 output state: 0 Enter line 2 of 3: cin state: 0 output state: 0 Enter line 3 of 3: Peter! cin state: 0 output state: 0 cat tio.dat Hallo Peter! >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-05-20 20:36 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-05-20 13:36 Peter Schmid [this message] 2002-05-20 14:09 paolo 2002-05-23 7:55 bkoz 2002-05-23 16:06 Peter Schmid 2002-05-27 2:36 bkoz
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