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/** BEGIN COPYRIGHT BLOCK
* Copyright 2001 Sun Microsystems, Inc.
* Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#if defined( XP_WIN32 )
#include <windows.h>
#endif
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "dsalib.h"
#include "prthread.h"
/*
* Function: adjustFile
* Property: Adjust the file offset to the "tail" of the file
* Called by: DisplayTail
* Return: -1 for error, else file size
*/
static int
adjustFile(FILE *fp, int curSize)
{
struct stat statBuf;
int fd = fileno(fp);
if ( fstat(fd, &statBuf) == -1 )
return(-1);
if ( statBuf.st_size < curSize ) /* file has shrunk! */
{
if ( fseek(fp, 0L, 0) == -1 ) /* get back to the beginning */
return(-1);
}
curSize = (int) statBuf.st_size;
if ( !curSize )
curSize = 1;
return(curSize);
}
/*
* Function: wrapLines
* Property: wrap lines at 50 characters. When a wrap point is encountered,
* insert the string "\n", since the buffer is going to be placed
* inside a JavaScript alert() call.
* Called by: ds_display_tail
* Return: pointer to wrapped buffer. Caller should free.
*/
static char *
wrapLines( char *buf )
{
char *src = buf;
char *obuf, *dst;
int lwidth = 0;
obuf = malloc( strlen( buf ) * 2 ); /* conservative */
if ( obuf == NULL ) {
return NULL;
}
dst = obuf;
while ( *src != '\0' ) {
if (( ++lwidth > 50 ) && isspace( *src )) {
*dst++ = '\\';
*dst++ = 'n';
lwidth = 0;
src++;
} else {
*dst++ = *src++;
}
}
*dst = '\0';
return obuf;
}
DS_EXPORT_SYMBOL int
ds_get_file_size(char *fileName)
{
struct stat statBuf;
if ( fileName == NULL )
return(0);
if ( stat(fileName, &statBuf) == -1 )
return(0);
return(statBuf.st_size);
}
/*
* Function: ds_display_tail
* Property: follow the tail and display it for timeOut secs or until the line
* read from the file contains the string doneMsg; the lastLine, if not null,
* will be filled in with the last line read from the file; this is useful
* for determining why the server failed to start e.g. port in use, ran out
* of semaphores, database is corrupted, etc.
* Calls: adjustFile
*/
DS_EXPORT_SYMBOL void
ds_display_tail(char *fileName, int timeOut, int startSeek, char *doneMsg,
char *lastLine)
{
FILE *fp = NULL;
int fd;
char msgBuf[BIG_LINE];
struct stat statBuf;
int curSize;
int i = timeOut;
if (lastLine != NULL)
lastLine[0] = 0;
if ( fileName == NULL )
return;
/*
* Open the file.
* Try to keep reading it assuming that it may get truncated.
*/
while (i && !fp)
{
fp = fopen(fileName, "r");
if (!fp)
{
PR_Sleep(PR_SecondsToInterval(1));
--i;
/* need to print something so http connection doesn't
timeout and also to let the user know something is
happening . . .
*/
if (!(i % 10))
{
ds_send_status("Attempting to obtain server status . . .");
}
}
}
if (!i || !fp)
return;
fd = fileno(fp);
if ( fstat(fd, &statBuf) == -1 ) {
(void) fclose(fp);
return;
}
curSize = (int) statBuf.st_size;
if ( startSeek < curSize )
curSize = startSeek;
if ( curSize > 0 )
if ( fseek(fp, curSize, SEEK_SET) == -1 ) {
(void) fclose(fp);
return;
}
if ( !curSize )
curSize = 1; /* ensure minimum */
while ( i )
{
int newCurSize;
newCurSize = curSize = adjustFile(fp, curSize);
if ( curSize == -1 ) {
(void) fclose(fp);
return;
}
while ( fgets(msgBuf, sizeof(msgBuf), fp) )
{
char *tmp;
if (lastLine != NULL)
strcpy(lastLine, msgBuf);
if ( (tmp = strchr(msgBuf, ((int) '\n'))) != NULL )
*tmp = '\0'; /* strip out real newlines from here */
ds_send_status(msgBuf);
if ( (strstr(msgBuf, "WARNING: ") != NULL) ||
(strstr(msgBuf, "ERROR: ") != NULL) ) {
char *wrapBuf;
wrapBuf = wrapLines( msgBuf );
if ( wrapBuf != NULL ) {
ds_send_error(wrapBuf, 5);
} else {
ds_send_error(msgBuf, 5);
}
}
if ( (doneMsg != NULL) && (strstr(msgBuf, doneMsg)) ) {
(void) fclose(fp);
return;
}
newCurSize = adjustFile(fp, newCurSize);
if ( newCurSize == -1 ) {
(void) fclose(fp);
return;
}
}
if ( ferror(fp) ) {
(void) fclose(fp);
return;
}
clearerr(fp); /* clear eof condition */
PR_Sleep(PR_SecondsToInterval(1));
if ( newCurSize != curSize )
i = timeOut; /* keep going till no more changes */
else
i--;
}
(void) fclose(fp);
}
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