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Issue #18458: Prevent crashes with newer versions of libedit. Its readline 

emulation has changed from 0-based indexing to 1-based like gnu readline.
Original patch by Ronald Oussoren.
This commit is contained in:
Ned Deily 2013-09-06 15:16:19 -07:00
parent f4ecfae75f
commit f70f4a63b6
2 changed files with 25 additions and 12 deletions
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3
Misc/NEWS
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@ -56,6 +56,9 @@ Core and Builtins
Library
-------
- Issue #18458: Prevent crashes with newer versions of libedit. Its readline
emulation has changed from 0-based indexing to 1-based like gnu readline.
- Issue #18852: Handle case of ``readline.__doc__`` being ``None`` in the new
readline activation code in ``site.py``.

34
Modules/readline.c
View File

@ -63,6 +63,8 @@ extern char **completion_matches(char *, CPFunction *);
*/
static int using_libedit_emulation = 0;
static const char libedit_version_tag[] = "EditLine wrapper";
static int libedit_history_start = 0;
#endif /* __APPLE__ */
#ifdef HAVE_RL_COMPLETION_DISPLAY_MATCHES_HOOK
@ -627,21 +629,21 @@ get_history_item(PyObject *self, PyObject *args)
return NULL;
#ifdef __APPLE__
if (using_libedit_emulation) {
/* Libedit emulation uses 0-based indexes,
* the real one uses 1-based indexes,
* adjust the index to ensure that Python
* code doesn't have to worry about the
* difference.
/* Older versions of libedit's readline emulation
* use 0-based indexes, while readline and newer
* versions of libedit use 1-based indexes.
*/
int length = _py_get_history_length();
idx --;
idx = idx - 1 + libedit_history_start;
/*
* Apple's readline emulation crashes when
* the index is out of range, therefore
* test for that and fail gracefully.
*/
if (idx < 0 || idx >= length) {
if (idx < (0 + libedit_history_start)
|| idx >= (length + libedit_history_start)) {
Py_RETURN_NONE;
}
}
@ -974,6 +976,17 @@ setup_readline(readlinestate *mod_state)
*/
if (using_libedit_emulation)
rl_initialize();
/* Detect if libedit's readline emulation uses 0-based
* indexing or 1-based indexing.
*/
add_history("1");
if (history_get(1) == NULL) {
libedit_history_start = 0;
} else {
libedit_history_start = 1;
}
clear_history();
#endif /* __APPLE__ */
using_history();
@ -1178,11 +1191,8 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
if (length > 0)
#ifdef __APPLE__
if (using_libedit_emulation) {
/*
* Libedit's emulation uses 0-based indexes,
* the real readline uses 1-based indexes.
*/
line = (const char *)history_get(length - 1)->line;
/* handle older 0-based or newer 1-based indexing */
line = (const char *)history_get(length + libedit_history_start - 1)->line;
} else
#endif /* __APPLE__ */
line = (const char *)history_get(length)->line;