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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 2013-10-12 15:47:58 -07:00
parent a14034872b
commit 5d4121a631
2 changed files with 29 additions and 15 deletions
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4
Misc/NEWS
View File

@ -76,6 +76,10 @@ 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.
Original patch by Ronald Oussoren.
- Issue #18919: If the close() method of a writer in the sunau or wave module
failed, second invocation of close() and destructor no more raise an
exception.

40
Modules/readline.c
View File

@ -54,14 +54,16 @@ extern char **completion_matches(char *, CPFunction *);
* with the "real" readline and cannot be detected at compile-time,
* hence we use a runtime check to detect if we're using libedit
*
* Currently there is one know API incompatibility:
* Currently there is one known API incompatibility:
* - 'get_history' has a 1-based index with GNU readline, and a 0-based
* index with libedit's emulation.
* index with older versions of libedit's emulation.
* - Note that replace_history and remove_history use a 0-based index
* with both implementation.
* with both implementations.
*/
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
@ -579,21 +581,21 @@ 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;
}
}
@ -908,6 +910,17 @@ setup_readline(void)
*/
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();
@ -1116,11 +1129,8 @@ 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;