mirror of https://github.com/python/cpython.git
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/* The readline module makes GNU readline available to Python. It
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* has ideas contributed by Lee Busby, LLNL, and William Magro,
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* Cornell Theory Center.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "Python.h"
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#include <setjmp.h>
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#include <signal.h>
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/* Routines needed from outside (but not declared in a header file). */
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extern int (*Py_input_hook)();
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extern char *readline();
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extern int rl_initialize();
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extern int rl_insert();
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extern int rl_bind_key();
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extern void add_history();
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extern char *rl_readline_name;
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extern int (*rl_event_hook)();
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extern char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *));
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/* This module's initialization routine */
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void initreadline (void);
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static void PyOS_ReadlineInit();
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static RETSIGTYPE onintr();
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static char *PyOS_GnuReadline();
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static jmp_buf jbuf;
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static PyObject *ReadlineError;
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static int already_initialized = 0;
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static char readline_module_documentation[] =
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"Readline Module, version0.0"
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;
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static struct PyMethodDef readline_methods[] =
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{
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{ 0, 0 }
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};
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/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% */
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/* Initialize the module. Actually, that's all you can or need to do. */
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void initreadline (void)
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{
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PyObject *m, *d;
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if (already_initialized)
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return;
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m = Py_InitModule4 ("readline", readline_methods,
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readline_module_documentation,
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(PyObject *) 0, PYTHON_API_VERSION);
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d = PyModule_GetDict (m);
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ReadlineError = PyString_FromString ("Readline.error");
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PyDict_SetItemString (d, "error", ReadlineError);
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if (PyErr_Occurred ()) {
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Py_FatalError ("Cannot initialize module readline");
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}
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if (isatty(fileno(stdin))){
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PyOS_ReadlineFunctionPointer = PyOS_GnuReadline;
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PyOS_ReadlineInit();
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}
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already_initialized = 1;
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}
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/* ARGSUSED */
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static RETSIGTYPE
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onintr(sig)
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int sig;
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{
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longjmp(jbuf, 1);
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}
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static void
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PyOS_ReadlineInit()
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{
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/* Force rebind of TAB to insert-tab */
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rl_readline_name = "python";
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rl_initialize();
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rl_bind_key('\t', rl_insert);
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}
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static char *
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PyOS_GnuReadline(prompt)
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char *prompt;
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{
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int n;
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char *p;
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RETSIGTYPE (*old_inthandler)();
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old_inthandler = signal(SIGINT, onintr);
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if (setjmp(jbuf)) {
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#ifdef HAVE_SIGRELSE
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/* This seems necessary on SunOS 4.1 (Rasmus Hahn) */
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sigrelse(SIGINT);
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#endif
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signal(SIGINT, old_inthandler);
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return NULL;
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}
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rl_event_hook = Py_input_hook;
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p = readline(prompt);
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signal(SIGINT, old_inthandler);
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if (p == NULL) {
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p = malloc(1);
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if (p != NULL)
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*p = '\0';
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return p;
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}
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n = strlen(p);
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if (n > 0)
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add_history(p);
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if ((p = realloc(p, n+2)) != NULL) {
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p[n] = '\n';
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p[n+1] = '\0';
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}
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return p;
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}
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#ifdef __cplusplus
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}
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#endif
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