[STDCXX-59] std::istream::getline(char*, size_type) doesn't store NUL on failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.1.2
• Fix Version/s: 4.1.3
• Component/s: 27. Input/Output

Environment

all

• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Created: 28/Oct/05 06:28
• Updated: 22/Apr/08 01:47
• Resolved: 09/Dec/05 10:29

Description

The program below aborts at runtime. According to lib.istream.unformatted, p20:
"[getline...] stores a null character (using charT()) into the next successive location of the array."

$ cat t.cpp && nice make t -r && ./t
#include <cassert>
#include <sstream>

int main ()
{
std::istringstream strm;

strm.setstate (strm.failbit);

char s [3] =

{ 'x', 'y', 'z' }

;
strm.getline (s, 2);

assert ('\0' == s [0]);
assert ('y' == s [1]);
assert ('z' == s [2]);
}

gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG -pthreads -D_RWSTD_USE_CONFIG -I/build/sebor/gcc-3.4.3-15s/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include -pedantic -nostdinc++ -g -Wall -W -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long t.cpp
gcc t.o -o t -L/build/sebor/gcc-3.4.3-15s/rwtest -lrwtest15s -pthreads -L/build/sebor/gcc-3.4.3-15s/lib -lstd15s -lsupc++ -lm
Assertion failed: '\0' == s [0], file t.cpp, line 13
Abort (core dumped)