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| 1 | +/* The readline module makes GNU readline available to Python. It |
| 2 | + * has ideas contributed by Lee Busby, LLNL, and William Magro, |
| 3 | + * Cornell Theory Center. |
| 4 | + */ |
| 5 | + |
| 6 | +#ifdef __cplusplus |
| 7 | +extern "C" { |
| 8 | +#endif |
| 9 | + |
| 10 | +#include "Python.h" |
| 11 | +#include <setjmp.h> |
| 12 | +#include <signal.h> |
| 13 | + |
| 14 | +/* Routines needed from outside (but not declared in a header file). */ |
| 15 | +extern int (*Py_input_hook)(); |
| 16 | +extern char *readline(); |
| 17 | +extern int rl_initialize(); |
| 18 | +extern int rl_insert(); |
| 19 | +extern int rl_bind_key(); |
| 20 | +extern void add_history(); |
| 21 | +extern char *rl_readline_name; |
| 22 | +extern int (*rl_event_hook)(); |
| 23 | +extern char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *)); |
| 24 | + |
| 25 | +/* This module's initialization routine */ |
| 26 | +void initreadline (void); |
| 27 | + |
| 28 | +static void PyOS_ReadlineInit(); |
| 29 | +static RETSIGTYPE onintr(); |
| 30 | +static char *PyOS_GnuReadline(); |
| 31 | +static jmp_buf jbuf; |
| 32 | +static PyObject *ReadlineError; |
| 33 | +static int already_initialized = 0; |
| 34 | +static char readline_module_documentation[] = |
| 35 | +"Readline Module, version0.0" |
| 36 | +; |
| 37 | + |
| 38 | +static struct PyMethodDef readline_methods[] = |
| 39 | +{ |
| 40 | + { 0, 0 } |
| 41 | +}; |
| 42 | + |
| 43 | +/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% */ |
| 44 | + |
| 45 | +/* Initialize the module. Actually, that's all you can or need to do. */ |
| 46 | +void initreadline (void) |
| 47 | +{ |
| 48 | + PyObject *m, *d; |
| 49 | + |
| 50 | + if (already_initialized) |
| 51 | + return; |
| 52 | + m = Py_InitModule4 ("readline", readline_methods, |
| 53 | + readline_module_documentation, |
| 54 | + (PyObject *) 0, PYTHON_API_VERSION); |
| 55 | + d = PyModule_GetDict (m); |
| 56 | + ReadlineError = PyString_FromString ("Readline.error"); |
| 57 | + PyDict_SetItemString (d, "error", ReadlineError); |
| 58 | + if (PyErr_Occurred ()) { |
| 59 | + Py_FatalError ("Cannot initialize module readline"); |
| 60 | + } |
| 61 | + if (isatty(fileno(stdin))){ |
| 62 | + PyOS_ReadlineFunctionPointer = PyOS_GnuReadline; |
| 63 | + PyOS_ReadlineInit(); |
| 64 | + } |
| 65 | + already_initialized = 1; |
| 66 | +} |
| 67 | + |
| 68 | +/* ARGSUSED */ |
| 69 | +static RETSIGTYPE |
| 70 | +onintr(sig) |
| 71 | + int sig; |
| 72 | +{ |
| 73 | + longjmp(jbuf, 1); |
| 74 | +} |
| 75 | + |
| 76 | +static void |
| 77 | +PyOS_ReadlineInit() |
| 78 | +{ |
| 79 | + /* Force rebind of TAB to insert-tab */ |
| 80 | + rl_readline_name = "python"; |
| 81 | + rl_initialize(); |
| 82 | + rl_bind_key('\t', rl_insert); |
| 83 | +} |
| 84 | + |
| 85 | +static char * |
| 86 | +PyOS_GnuReadline(prompt) |
| 87 | + char *prompt; |
| 88 | +{ |
| 89 | + int n; |
| 90 | + char *p; |
| 91 | + RETSIGTYPE (*old_inthandler)(); |
| 92 | + old_inthandler = signal(SIGINT, onintr); |
| 93 | + if (setjmp(jbuf)) { |
| 94 | +#ifdef HAVE_SIGRELSE |
| 95 | + /* This seems necessary on SunOS 4.1 (Rasmus Hahn) */ |
| 96 | + sigrelse(SIGINT); |
| 97 | +#endif |
| 98 | + signal(SIGINT, old_inthandler); |
| 99 | + return NULL; |
| 100 | + } |
| 101 | + rl_event_hook = Py_input_hook; |
| 102 | + p = readline(prompt); |
| 103 | + signal(SIGINT, old_inthandler); |
| 104 | + if (p == NULL) { |
| 105 | + p = malloc(1); |
| 106 | + if (p != NULL) |
| 107 | + *p = '\0'; |
| 108 | + return p; |
| 109 | + } |
| 110 | + n = strlen(p); |
| 111 | + if (n > 0) |
| 112 | + add_history(p); |
| 113 | + if ((p = realloc(p, n+2)) != NULL) { |
| 114 | + p[n] = '\n'; |
| 115 | + p[n+1] = '\0'; |
| 116 | + } |
| 117 | + return p; |
| 118 | +} |
| 119 | + |
| 120 | +#ifdef __cplusplus |
| 121 | +} |
| 122 | +#endif |
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