1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/***********************************************************
Copyright (c) 2000, BeOpen.com.
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
All rights reserved.
See the file "Misc/COPYRIGHT" for information on usage and
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
******************************************************************/
/* Readline interface for tokenizer.c and [raw_]input() in bltinmodule.c.
By default, or when stdin is not a tty device, we have a super
simple my_readline function using fgets.
Optionally, we can use the GNU readline library.
my_readline() has a different return value from GNU readline():
- NULL if an interrupt occurred or if an error occurred
- a malloc'ed empty string if EOF was read
- a malloc'ed string ending in \n normally
*/
#include "Python.h"
int (*PyOS_InputHook)() = NULL;
/* This function restarts a fgets() after an EINTR error occurred
except if PyOS_InterruptOccurred() returns true. */
static int
my_fgets(buf, len, fp)
char *buf;
int len;
FILE *fp;
{
char *p;
for (;;) {
if (PyOS_InputHook != NULL)
(void)(PyOS_InputHook)();
errno = 0;
p = fgets(buf, len, fp);
if (p != NULL)
return 0; /* No error */
if (feof(fp)) {
return -1; /* EOF */
}
#ifdef EINTR
if (errno == EINTR) {
if (PyOS_InterruptOccurred()) {
return 1; /* Interrupt */
}
continue;
}
#endif
if (PyOS_InterruptOccurred()) {
return 1; /* Interrupt */
}
return -2; /* Error */
}
/* NOTREACHED */
}
/* Readline implementation using fgets() */
char *
PyOS_StdioReadline(prompt)
char *prompt;
{
size_t n;
char *p;
n = 100;
if ((p = PyMem_MALLOC(n)) == NULL)
return NULL;
fflush(stdout);
if (prompt)
fprintf(stderr, "%s", prompt);
fflush(stderr);
switch (my_fgets(p, (int)n, stdin)) {
case 0: /* Normal case */
break;
case 1: /* Interrupt */
PyMem_FREE(p);
return NULL;
case -1: /* EOF */
case -2: /* Error */
default: /* Shouldn't happen */
*p = '\0';
break;
}
#ifdef MPW
/* Hack for MPW C where the prompt comes right back in the input */
/* XXX (Actually this would be rather nice on most systems...) */
n = strlen(prompt);
if (strncmp(p, prompt, n) == 0)
memmove(p, p + n, strlen(p) - n + 1);
#endif
n = strlen(p);
while (n > 0 && p[n-1] != '\n') {
size_t incr = n+2;
p = PyMem_REALLOC(p, n + incr);
if (p == NULL)
return NULL;
if (incr > INT_MAX) {
PyErr_SetString(PyExc_OverflowError, "input line too long");
}
if (my_fgets(p+n, (int)incr, stdin) != 0)
break;
n += strlen(p+n);
}
return PyMem_REALLOC(p, n+1);
}
/* By initializing this function pointer, systems embedding Python can
override the readline function.
Note: Python expects in return a buffer allocated with PyMem_Malloc. */
char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *));
/* Interface used by tokenizer.c and bltinmodule.c */
char *
PyOS_Readline(prompt)
char *prompt;
{
char *rv;
if (PyOS_ReadlineFunctionPointer == NULL) {
PyOS_ReadlineFunctionPointer = PyOS_StdioReadline;
}
Py_BEGIN_ALLOW_THREADS
rv = (*PyOS_ReadlineFunctionPointer)(prompt);
Py_END_ALLOW_THREADS
return rv;
}
|
