mirror of https://github.com/python/cpython
bpo-38634: Allow non-apple build to cope with libedit (GH-16986)
The readline module now detects if Python is linked to libedit at runtime on all platforms. Previously, the check was only done on macOS. If Python is used as a library by a binary linking to libedit, the linker resolves the rl_initialize symbol required by the readline module against libedit instead of libreadline, which leads to a segfault. Take advantage of the existing supporting code to have readline module being compatible with both situations.
This commit is contained in:
serge-sans-paille
Victor Stinner
parent
ac0e1c2694
commit
7105319ada
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@ -0,0 +1,2 @@
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The :mod:`readline` module now detects if Python is linked to libedit at runtime
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on all platforms. Previously, the check was only done on macOS.
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@ -45,14 +45,14 @@ extern char **completion_matches(char *, CPFunction *);
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#endif
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#endif
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#ifdef __APPLE__
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/*
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* It is possible to link the readline module to the readline
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* emulation library of editline/libedit.
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*
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* On OSX this emulation library is not 100% API compatible
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* with the "real" readline and cannot be detected at compile-time,
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* hence we use a runtime check to detect if we're using libedit
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* This emulation library is not 100% API compatible with the "real" readline
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* and cannot be detected at compile-time,
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* hence we use a runtime check to detect if the Python readlinke module is
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* linked to libedit.
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*
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* Currently there is one known API incompatibility:
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* - 'get_history' has a 1-based index with GNU readline, and a 0-based
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@ -64,7 +64,6 @@ static int using_libedit_emulation = 0;
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static const char libedit_version_tag[] = "EditLine wrapper";
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static int libedit_history_start = 0;
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#endif /* __APPLE__ */
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#ifdef HAVE_RL_COMPLETION_DISPLAY_MATCHES_HOOK
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static void
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@ -693,7 +692,6 @@ get_history_item(PyObject *self, PyObject *args)
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if (!PyArg_ParseTuple(args, "i:get_history_item", &idx))
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return NULL;
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#ifdef __APPLE__
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if (using_libedit_emulation) {
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/* Older versions of libedit's readline emulation
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* use 0-based indexes, while readline and newer
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@ -713,7 +711,6 @@ get_history_item(PyObject *self, PyObject *args)
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Py_RETURN_NONE;
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}
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}
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#endif /* __APPLE__ */
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if ((hist_ent = history_get(idx)))
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return decode(hist_ent->line);
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else {
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@ -1081,7 +1078,6 @@ setup_readline(readlinestate *mod_state)
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/* The name must be defined before initialization */
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rl_readline_name = "python";
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#ifdef __APPLE__
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/* the libedit readline emulation resets key bindings etc
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* when calling rl_initialize. So call it upfront
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*/
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@ -1098,7 +1094,6 @@ setup_readline(readlinestate *mod_state)
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libedit_history_start = 1;
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}
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clear_history();
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#endif /* __APPLE__ */
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using_history();
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@ -1127,9 +1122,7 @@ setup_readline(readlinestate *mod_state)
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mod_state->begidx = PyLong_FromLong(0L);
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mod_state->endidx = PyLong_FromLong(0L);
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#ifdef __APPLE__
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if (!using_libedit_emulation)
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#endif
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{
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if (!isatty(STDOUT_FILENO)) {
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/* Issue #19884: stdout is not a terminal. Disable meta modifier
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@ -1149,11 +1142,9 @@ setup_readline(readlinestate *mod_state)
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* XXX: A bug in the readline-2.2 library causes a memory leak
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* inside this function. Nothing we can do about it.
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*/
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#ifdef __APPLE__
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if (using_libedit_emulation)
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rl_read_init_file(NULL);
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else
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#endif /* __APPLE__ */
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rl_initialize();
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RESTORE_LOCALE(saved_locale)
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@ -1283,12 +1274,10 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
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int length = _py_get_history_length();
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if (length > 0) {
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HIST_ENTRY *hist_ent;
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#ifdef __APPLE__
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if (using_libedit_emulation) {
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/* handle older 0-based or newer 1-based indexing */
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hist_ent = history_get(length + libedit_history_start - 1);
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} else
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#endif /* __APPLE__ */
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hist_ent = history_get(length);
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line = hist_ent ? hist_ent->line : "";
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} else
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@ -1316,10 +1305,8 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
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PyDoc_STRVAR(doc_module,
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"Importing this module enables command line editing using GNU readline.");
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#ifdef __APPLE__
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PyDoc_STRVAR(doc_module_le,
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"Importing this module enables command line editing using libedit readline.");
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#endif /* __APPLE__ */
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static struct PyModuleDef readlinemodule = {
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PyModuleDef_HEAD_INIT,
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@ -1340,7 +1327,6 @@ PyInit_readline(void)
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PyObject *m;
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readlinestate *mod_state;
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#ifdef __APPLE__
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if (strncmp(rl_library_version, libedit_version_tag, strlen(libedit_version_tag)) == 0) {
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using_libedit_emulation = 1;
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}
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@ -1348,7 +1334,6 @@ PyInit_readline(void)
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if (using_libedit_emulation)
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readlinemodule.m_doc = doc_module_le;
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#endif /* __APPLE__ */
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m = PyModule_Create(&readlinemodule);
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