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ENH: added a limit to the getline method

This commit is contained in:
Ken Martin 2007-03-01 14:30:42 -05:00
parent c733ab2701
commit ae3ef64307
2 changed files with 22 additions and 2 deletions
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21
Source/kwsys/SystemTools.cxx
View File

@ -3542,7 +3542,8 @@ kwsys_stl::string SystemTools::MakeCindentifier(const char* s)
// if any data were read before the end-of-file was reached.
bool SystemTools::GetLineFromStream(kwsys_ios::istream& is,
kwsys_stl::string& line,
bool* has_newline /* = 0 */)
bool* has_newline /* = 0 */,
long sizeLimit /* = -1 */)
{
const int bufferSize = 1024;
char buffer[bufferSize];
@ -3552,9 +3553,12 @@ bool SystemTools::GetLineFromStream(kwsys_ios::istream& is,
// Start with an empty line.
line = "";
long leftToRead = sizeLimit;
// If no characters are read from the stream, the end of file has
// been reached. Clear the fail bit just before reading.
while(!haveNewline &&
leftToRead != 0 &&
(is.clear(is.rdstate() & ~kwsys_ios::ios::failbit),
is.getline(buffer, bufferSize), is.gcount() > 0))
{
@ -3575,8 +3579,23 @@ bool SystemTools::GetLineFromStream(kwsys_ios::istream& is,
buffer[length-1] = 0;
}
// if we read too much then truncate the buffer
if (leftToRead > 0)
{
if (length > leftToRead)
{
buffer[leftToRead-1] = 0;
leftToRead = 0;
}
else
{
leftToRead -= length;
}
}
// Append the data read to the line.
line.append(buffer);
sizeLimit -= length;
}
// Return the results.

3
Source/kwsys/SystemTools.hxx.in
View File

@ -434,7 +434,8 @@ public:
*/
static bool GetLineFromStream(kwsys_ios::istream& istr,
kwsys_stl::string& line,
bool* has_newline=0);
bool* has_newline=0,
long sizeLimit=-1);
/**
* Get the parent directory of the directory or file