| 1 |
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| 2 | /* Readline interface for tokenizer.c and [raw_]input() in bltinmodule.c.
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| 3 | By default, or when stdin is not a tty device, we have a super
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| 4 | simple my_readline function using fgets.
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| 5 | Optionally, we can use the GNU readline library.
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| 6 | my_readline() has a different return value from GNU readline():
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| 7 | - NULL if an interrupt occurred or if an error occurred
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| 8 | - a malloc'ed empty string if EOF was read
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| 9 | - a malloc'ed string ending in \n normally
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| 10 | */
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| 11 |
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| 12 | #include "Python.h"
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| 13 | #ifdef MS_WINDOWS
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| 14 | #define WIN32_LEAN_AND_MEAN
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| 15 | #include "windows.h"
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| 16 | #endif /* MS_WINDOWS */
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| 17 |
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| 18 | #ifdef __VMS
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| 19 | extern char* vms__StdioReadline(FILE *sys_stdin, FILE *sys_stdout, char *prompt);
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| 20 | #endif
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| 21 |
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| 22 |
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| 23 | PyThreadState* _PyOS_ReadlineTState;
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| 24 |
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| 25 | #ifdef WITH_THREAD
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| 26 | #include "pythread.h"
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| 27 | static PyThread_type_lock _PyOS_ReadlineLock = NULL;
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| 28 | #endif
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| 29 |
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| 30 | int (*PyOS_InputHook)(void) = NULL;
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| 31 |
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| 32 | #ifdef RISCOS
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| 33 | int Py_RISCOSWimpFlag;
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| 34 | #endif
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| 35 |
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| 36 | /* This function restarts a fgets() after an EINTR error occurred
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| 37 | except if PyOS_InterruptOccurred() returns true. */
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| 38 |
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| 39 | static int
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| 40 | my_fgets(char *buf, int len, FILE *fp)
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| 41 | {
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| 42 | char *p;
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| 43 | for (;;) {
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| 44 | if (PyOS_InputHook != NULL)
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| 45 | (void)(PyOS_InputHook)();
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| 46 | errno = 0;
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| 47 | p = fgets(buf, len, fp);
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| 48 | if (p != NULL)
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| 49 | return 0; /* No error */
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| 50 | #ifdef MS_WINDOWS
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| 51 | /* In the case of a Ctrl+C or some other external event
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| 52 | interrupting the operation:
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| 53 | Win2k/NT: ERROR_OPERATION_ABORTED is the most recent Win32
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| 54 | error code (and feof() returns TRUE).
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| 55 | Win9x: Ctrl+C seems to have no effect on fgets() returning
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| 56 | early - the signal handler is called, but the fgets()
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