From 3aca65312a9b6c5fe741167764d56de073259f73 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Sat, 18 Sep 1999 20:49:39 +0000
Subject: Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.

---
 Python/traceback.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/Python/traceback.c b/Python/traceback.c
index 53b84f3..ca77eaa 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -197,8 +197,17 @@ tb_displayline(f, filename, lineno, name)
 	if (xfp == NULL || err != 0)
 		return err;
 	for (i = 0; i < lineno; i++) {
-		if (fgets(linebuf, sizeof linebuf, xfp) == NULL)
-			break;
+		char* pLastChar = &linebuf[sizeof(linebuf)-2];
+		do {
+			*pLastChar = '\0';
+			if (fgets(linebuf, sizeof linebuf, xfp) == NULL)
+				break;
+			/* fgets read *something*; if it didn't get as
+			   far as pLastChar, it must have found a newline
+			   or hit the end of the file;	if pLastChar is \n,
+			   it obviously found a newline; else we haven't
+			   yet seen a newline, so must continue */
+		} while (*pLastChar != '\0' && *pLastChar != '\n');
 	}
 	if (i == lineno) {
 		char *p = linebuf;
-- 
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