165 lines
3 KiB
C
165 lines
3 KiB
C
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/*
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* logs system time and a text string to a log buffer
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*/
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#include "windows.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include "sumserve.h"
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#include "errlog.h"
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#include "server.h"
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/*
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* users HLOG handle is a pointer to one of these structures
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*
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* core is the section we send to him on request.
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*/
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struct error_log {
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CRITICAL_SECTION critsec;
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struct corelog core;
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};
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/* create an empty log */
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HLOG Log_Create(void)
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{
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HLOG hlog;
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hlog = GlobalLock(GlobalAlloc(GHND, sizeof(struct error_log)));
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if (hlog == NULL) {
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return(NULL);
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}
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InitializeCriticalSection(&hlog->critsec);
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hlog->core.lcode = LRESPONSE;
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hlog->core.bWrapped = FALSE;
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hlog->core.dwRevCount = 1;
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hlog->core.length = 0;
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return(hlog);
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}
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/* delete a log */
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VOID Log_Delete(HLOG hlog)
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{
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DeleteCriticalSection(&hlog->critsec);
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GlobalFree(GlobalHandle(hlog));
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}
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/*
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* private function to delete the first log item in order to
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* make space. Critsec already held
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*/
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VOID Log_DeleteFirstItem(HLOG hlog)
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{
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int length;
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PBYTE pData;
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/* note that we have lost data */
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hlog->core.bWrapped = TRUE;
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if (hlog->core.length <= 0) {
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return;
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}
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pData = hlog->core.Data;
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/*
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* we need to erase one entry - that is, one FILETIME struct,
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* plus a null-terminated string (including the null).
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*/
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length = sizeof(FILETIME) + lstrlen (pData + sizeof(FILETIME)) + 1;
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MoveMemory(pData, pData + length, hlog->core.length - length);
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hlog->core.length -= length;
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}
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/* write a previous formatted string and a time to the log */
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VOID Log_WriteData(HLOG hlog, LPFILETIME ptime, LPSTR pstr)
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{
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int length;
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LPBYTE pData;
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EnterCriticalSection(&hlog->critsec);
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/* every change changes the revision number */
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hlog->core.dwRevCount++;
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/*
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* we will insert the string plus null plus a filetime struct
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*/
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length = lstrlen(pstr) + 1 + sizeof(FILETIME);
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/*
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* make space in log for this item by deleting earlier items
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*/
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while ( (int)(sizeof(hlog->core.Data) - hlog->core.length) < length) {
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Log_DeleteFirstItem(hlog);
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}
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pData = &hlog->core.Data[hlog->core.length];
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/*
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* first part of the item is the time as a FILETIME struct
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*/
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* (FILETIME UNALIGNED *)pData = *ptime;
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pData += sizeof(FILETIME);
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/* followed by the ansi string */
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lstrcpy(pData, pstr);
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pData[lstrlen(pstr)] = '\0';
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/* update current log length */
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hlog->core.length += length;
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LeaveCriticalSection(&hlog->critsec);
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}
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/* send a log to a named-pipe client */
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VOID Log_Send(HANDLE hpipe, HLOG hlog)
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{
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ss_sendblock(hpipe, (PSTR) &hlog->core, sizeof(hlog->core));
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}
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VOID
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Log_Write(HLOG hlog, char * szFormat, ...)
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{
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char buf[512];
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va_list va;
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FILETIME ft;
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SYSTEMTIME systime;
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va_start(va, szFormat);
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wvsprintfA(buf, szFormat, va);
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va_end(va);
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dprintf1((buf));
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GetSystemTime(&systime);
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SystemTimeToFileTime(&systime, &ft);
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Log_WriteData(hlog, &ft, buf);
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}
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