mirror of https://github.com/python/cpython
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Readline interface for tokenizer.c and [raw_]input() in bltinmodule.c.
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By default, or when stdin is not a tty device, we have a super
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simple my_readline function using fgets.
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Optionally, we can use the GNU readline library.
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my_readline() has a different return value from GNU readline():
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- NULL if an interrupt occurred or if an error occurred
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- a malloc'ed empty string if EOF was read
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- a malloc'ed string ending in \n normally
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*/
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#define Py_USE_NEW_NAMES 1
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "myproto.h"
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#include "mymalloc.h"
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#include "intrcheck.h"
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int (*PyOS_InputHook)() = NULL;
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/* This function restarts a fgets() after an EINTR error occurred
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except if PyOS_InterruptOccurred() returns true. */
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static int
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my_fgets(buf, len, fp)
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char *buf;
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int len;
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FILE *fp;
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{
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char *p;
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for (;;) {
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if (PyOS_InputHook != NULL)
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(void)(PyOS_InputHook)();
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errno = 0;
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p = fgets(buf, len, fp);
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if (p != NULL)
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return 0; /* No error */
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if (feof(fp)) {
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return -1; /* EOF */
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}
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#ifdef EINTR
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if (errno == EINTR) {
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if (PyOS_InterruptOccurred()) {
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return 1; /* Interrupt */
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}
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continue;
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}
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#endif
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if (PyOS_InterruptOccurred()) {
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return 1; /* Interrupt */
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}
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return -2; /* Error */
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}
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/* NOTREACHED */
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}
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/* Readline implementation using fgets() */
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char *
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PyOS_StdioReadline(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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n = 100;
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if ((p = malloc(n)) == NULL)
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return NULL;
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fflush(stdout);
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if (prompt)
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fprintf(stderr, "%s", prompt);
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fflush(stderr);
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switch (my_fgets(p, n, stdin)) {
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case 0: /* Normal case */
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break;
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case 1: /* Interrupt */
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free(p);
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return NULL;
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case -1: /* EOF */
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case -2: /* Error */
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default: /* Shouldn't happen */
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*p = '\0';
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break;
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}
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#ifdef MPW
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/* Hack for MPW C where the prompt comes right back in the input */
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/* XXX (Actually this would be rather nice on most systems...) */
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n = strlen(prompt);
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if (strncmp(p, prompt, n) == 0)
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memmove(p, p + n, strlen(p) - n + 1);
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#endif
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n = strlen(p);
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while (n > 0 && p[n-1] != '\n') {
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int incr = n+2;
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p = realloc(p, n + incr);
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if (p == NULL)
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return NULL;
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if (my_fgets(p+n, incr, stdin) != 0)
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break;
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n += strlen(p+n);
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}
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return realloc(p, n+1);
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}
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/* By initializing this function pointer, systems embedding Python can
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override the readline function. */
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char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *));
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/* Interface used by tokenizer.c and bltinmodule.c */
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char *
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PyOS_Readline(prompt)
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char *prompt;
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{
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if (PyOS_ReadlineFunctionPointer == NULL) {
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PyOS_ReadlineFunctionPointer = PyOS_StdioReadline;
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}
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return (*PyOS_ReadlineFunctionPointer)(prompt);
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}
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