summaryrefslogtreecommitdiffstats
path: root/Python/dynload_win.c
blob: 50e374401198756e8e486464386410fde65ea3b2 (plain)
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
/***********************************************************
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.
******************************************************************/

/* Support for dynamic loading of extension modules */

#include <windows.h>
#include <direct.h>

#include "Python.h"
#include "importdl.h"

const struct filedescr _PyImport_DynLoadFiletab[] = {
#ifdef _DEBUG
	{"_d.pyd", "rb", C_EXTENSION},
	{"_d.dll", "rb", C_EXTENSION},
#else
	{".pyd", "rb", C_EXTENSION},
	{".dll", "rb", C_EXTENSION},
#endif
	{0, 0}
};


dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
				    const char *pathname, FILE *fp)
{
	dl_funcptr p;
	char funcname[258];

	sprintf(funcname, "init%.200s", shortname);

#ifdef MS_WIN32
	{
		HINSTANCE hDLL;
		char pathbuf[260];
		if (strchr(pathname, '\\') == NULL &&
		    strchr(pathname, '/') == NULL)
		{
			/* Prefix bare filename with ".\" */
			char *p = pathbuf;
			*p = '\0';
			_getcwd(pathbuf, sizeof pathbuf);
			if (*p != '\0' && p[1] == ':')
				p += 2;
			sprintf(p, ".\\%-.255s", pathname);
			pathname = pathbuf;
		}
		/* Look for dependent DLLs in directory of pathname first */
		/* XXX This call doesn't exist in Windows CE */
		hDLL = LoadLibraryEx(pathname, NULL,
				     LOAD_WITH_ALTERED_SEARCH_PATH);
		if (hDLL==NULL){
			char errBuf[256];
			unsigned int errorCode;

			/* Get an error string from Win32 error code */
			char theInfo[256]; /* Pointer to error text
					      from system */
			int theLength; /* Length of error text */

			errorCode = GetLastError();

			theLength = FormatMessage(
				FORMAT_MESSAGE_FROM_SYSTEM, /* flags */
				NULL, /* message source */
				errorCode, /* the message (error) ID */
				0, /* default language environment */
				(LPTSTR) theInfo, /* the buffer */
				sizeof(theInfo), /* the buffer size */
				NULL); /* no additional format args. */

			/* Problem: could not get the error message.
			   This should not happen if called correctly. */
			if (theLength == 0) {
				sprintf(errBuf,
					"DLL load failed with error code %d",
					errorCode);
			} else {
				size_t len;
				/* For some reason a \r\n
				   is appended to the text */
				if (theLength >= 2 &&
				    theInfo[theLength-2] == '\r' &&
				    theInfo[theLength-1] == '\n') {
					theLength -= 2;
					theInfo[theLength] = '\0';
				}
				strcpy(errBuf, "DLL load failed: ");
				len = strlen(errBuf);
				strncpy(errBuf+len, theInfo,
					sizeof(errBuf)-len);
				errBuf[sizeof(errBuf)-1] = '\0';
			}
			PyErr_SetString(PyExc_ImportError, errBuf);
		return NULL;
		}
		p = GetProcAddress(hDLL, funcname);
	}
#endif /* MS_WIN32 */
#ifdef MS_WIN16
	{
		HINSTANCE hDLL;
		char pathbuf[16];
		if (strchr(pathname, '\\') == NULL &&
		    strchr(pathname, '/') == NULL)
		{
			/* Prefix bare filename with ".\" */
			sprintf(pathbuf, ".\\%-.13s", pathname);
			pathname = pathbuf;
		}
		hDLL = LoadLibrary(pathname);
		if (hDLL < HINSTANCE_ERROR){
			char errBuf[256];
			sprintf(errBuf,
				"DLL load failed with error code %d", hDLL);
			PyErr_SetString(PyExc_ImportError, errBuf);
			return NULL;
		}
		p = GetProcAddress(hDLL, funcname);
	}
#endif /* MS_WIN16 */

	return p;
}