98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
#if (defined(_WIN64) || defined(_WIN32_WCE)) && !defined(UNICODE)
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# define UNICODE
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#endif
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#if defined(UNICODE) && !defined(_UNICODE)
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# define _UNICODE
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#endif
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#if defined(_UNICODE) && !defined(UNICODE)
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# define UNICODE
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#endif
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#include <windows.h>
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#include <tchar.h>
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#include <stdio.h>
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#include "uplink.h"
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void OPENSSL_showfatal(const char *, ...);
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static TCHAR msg[128];
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static void unimplemented(void)
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{
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OPENSSL_showfatal(sizeof(TCHAR) == sizeof(char) ? "%s\n" : "%S\n", msg);
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ExitProcess(1);
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}
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void OPENSSL_Uplink(volatile void **table, int index)
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{
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static HMODULE volatile apphandle = NULL;
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static void **volatile applinktable = NULL;
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int len;
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void (*func) (void) = unimplemented;
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HANDLE h;
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void **p;
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/*
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* Note that the below code is not MT-safe in respect to msg buffer, but
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* what's the worst thing that can happen? Error message might be
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* misleading or corrupted. As error condition is fatal and should never
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* be risen, I accept the risk...
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*/
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/*
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* One can argue that I should have used InterlockedExchangePointer or
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* something to update static variables and table[]. Well, store
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* instructions are as atomic as they can get and assigned values are
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* effectively constant... So that volatile qualifier should be
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* sufficient [it prohibits compiler to reorder memory access
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* instructions].
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*/
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do {
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len = _sntprintf(msg, sizeof(msg) / sizeof(TCHAR),
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_T("OPENSSL_Uplink(%p,%02X): "), table, index);
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_tcscpy(msg + len, _T("unimplemented function"));
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if ((h = apphandle) == NULL) {
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if ((h = GetModuleHandle(NULL)) == NULL) {
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apphandle = (HMODULE) - 1;
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_tcscpy(msg + len, _T("no host application"));
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break;
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}
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apphandle = h;
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}
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if ((h = apphandle) == (HMODULE) - 1) /* revalidate */
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break;
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if (applinktable == NULL) {
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void **(*applink) ();
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applink = (void **(*)())GetProcAddress(h, "OPENSSL_Applink");
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if (applink == NULL) {
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apphandle = (HMODULE) - 1;
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_tcscpy(msg + len, _T("no OPENSSL_Applink"));
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break;
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}
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p = (*applink) ();
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if (p == NULL) {
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apphandle = (HMODULE) - 1;
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_tcscpy(msg + len, _T("no ApplinkTable"));
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break;
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}
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applinktable = p;
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} else
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p = applinktable;
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if (index > (int)p[0])
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break;
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if (p[index])
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func = p[index];
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} while (0);
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table[index] = func;
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}
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#ifdef SELFTEST
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main()
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{
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UP_fprintf(UP_stdout, "hello, world!\n");
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}
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#endif
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