New function ltime() returns a struct tm of the current local time.

Fixes crashes when time() returns (time_t)-1 on Windows by using the
Win32 GetLocalTime() function.  (The Unix implementation still just 
uses time() and localtime().)

[originally from svn r5086]

Recipe

@@ -206,8 +206,8 @@ SFTP     = sftp int64 logging
 # Miscellaneous objects appearing in all the network utilities (not
 # Pageant or PuTTYgen).
 MISC     = timing misc version settings tree234 proxy
-WINMISC  = MISC winstore winnet cmdline windefs winmisc pproxy
-UXMISC   = MISC uxstore uxsel uxnet cmdline uxmisc uxproxy
+WINMISC  = MISC winstore winnet cmdline windefs winmisc pproxy wintime
+UXMISC   = MISC uxstore uxsel uxnet cmdline uxmisc uxproxy time
 MACMISC  = MISC macstore macnet mtcpnet otnet macmisc macabout pproxy
 
 # Character set library, for use in pterm.
@@ -245,10 +245,10 @@ pageant  : [G] winpgnt sshrsa sshpubk sshdes sshbn sshmd5 version tree234
 puttygen : [G] winpgen sshrsag sshdssg sshprime sshdes sshbn sshmd5 version
          + sshrand winnoise sshsha winstore misc winctrls sshrsa sshdss winmisc
          + sshpubk sshaes sshsh512 import winutils puttygen.res tree234
-	 + notiming LIBS
+	 + notiming LIBS wintime
 
 pterm    : [X] UXTERM uxmisc misc ldisc settings uxpty uxsel BE_NONE uxstore
-         + uxsignal CHARSET cmdline uxpterm version
+         + uxsignal CHARSET cmdline uxpterm version time
 putty    : [X] UXTERM uxmisc misc ldisc settings uxpty uxsel BE_ALL uxstore
          + uxsignal CHARSET uxputty NONSSH UXSSH UXMISC ux_x11
 puttytel : [X] UXTERM uxmisc misc ldisc settings uxpty uxsel BE_NOSSH
@@ -258,7 +258,8 @@ plink    : [U] uxplink uxcons NONSSH UXSSH BE_ALL logging UXMISC uxsignal ux_x11
 
 puttygen : [U] cmdgen sshrsag sshdssg sshprime sshdes sshbn sshmd5 version
          + sshrand uxnoise sshsha misc sshrsa sshdss uxcons uxstore uxmisc
-         + sshpubk sshaes sshsh512 import puttygen.res tree234 uxgen notiming
+         + sshpubk sshaes sshsh512 import puttygen.res time tree234 uxgen
+         + notiming
 
 pscp     : [U] pscp uxsftp uxcons UXSSH BE_SSH SFTP wildcard UXMISC
 psftp    : [U] psftp uxsftp uxcons UXSSH BE_SSH SFTP UXMISC

cmdgen.c

@@ -602,19 +602,17 @@ int main(int argc, char **argv)
     if (keytype != NOKEYGEN) {
 	char *entropy;
 	char default_comment[80];
-	time_t t;
-	struct tm *tm;
+	struct tm tm;
 	struct progress prog;
 
 	prog.phase = -1;
 	prog.current = -1;
 
-	time(&t);
-	tm = localtime(&t);
+	tm = ltime();
 	if (keytype == DSA)
-	    strftime(default_comment, 30, "dsa-key-%Y%m%d", tm);
+	    strftime(default_comment, 30, "dsa-key-%Y%m%d", &tm);
 	else
-	    strftime(default_comment, 30, "rsa-key-%Y%m%d", tm);
+	    strftime(default_comment, 30, "rsa-key-%Y%m%d", &tm);
 
 	random_ref();
 	entropy = get_random_data(bits / 8);

logging.c

@@ -169,7 +169,6 @@ void logfopen(void *handle)
 {
     struct LogContext *ctx = (struct LogContext *)handle;
     char buf[256];
-    time_t t;
     struct tm tm;
     char writemod[4];
 
@@ -181,8 +180,7 @@ void logfopen(void *handle)
 	return;
     sprintf(writemod, "wb");	       /* default to rewrite */
 
-    time(&t);
-    tm = *localtime(&t);
+    tm = ltime();
 
     /* substitute special codes in file name */
     xlatlognam(&ctx->currlogfilename, ctx->cfg.logfilename,ctx->cfg.host, &tm);

misc.h

@@ -5,6 +5,7 @@
 
 #include <stdio.h>		       /* for FILE * */
 #include <stdarg.h>		       /* for va_list */
+#include <time.h>                      /* for struct_tm */
 
 #ifndef FALSE
 #define FALSE 0
@@ -41,6 +42,8 @@ void bufchain_prefix(bufchain *ch, void **data, int *len);
 void bufchain_consume(bufchain *ch, int len);
 void bufchain_fetch(bufchain *ch, void *data, int len);
 
+struct tm ltime(void);
+
 /*
  * Debugging functions.
  *

time.c

@@ -0,0 +1,10 @@
+#include <time.h>
+#include <assert.h>
+
+struct tm ltime(void)
+{
+    time_t t;
+    time(&t);
+    assert (t != ((time_t)-1));
+    return *localtime(&t);
+}

unix/gtkdlg.c

@@ -2728,16 +2728,15 @@ void logevent_dlg(void *estuff, const char *string)
     struct eventlog_stuff *es = (struct eventlog_stuff *)estuff;
 
     char timebuf[40];
-    time_t t;
+    struct tm tm;
 
     if (es->nevents >= es->negsize) {
 	es->negsize += 64;
 	es->events = sresize(es->events, es->negsize, char *);
     }
 
-    time(&t);
-    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S\t",
-	     localtime(&t));
+    tm=ltime();
+    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S\t", &tm);
 
     es->events[es->nevents] = snewn(strlen(timebuf) + strlen(string) + 1, char);
     strcpy(es->events[es->nevents], timebuf);

windows/windlg.c

@@ -661,7 +661,7 @@ int do_reconfig(HWND hwnd, int protcfginfo)
 void logevent(void *frontend, const char *string)
 {
     char timebuf[40];
-    time_t t;
+    struct tm tm;
 
     log_eventlog(logctx, string);
 
@@ -670,9 +670,8 @@ void logevent(void *frontend, const char *string)
 	events = sresize(events, negsize, char *);
     }
 
-    time(&t);
-    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S\t",
-	     localtime(&t));
+    tm=ltime();
+    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S\t", &tm);
 
     events[nevents] = snewn(strlen(timebuf) + strlen(string) + 1, char);
     strcpy(events[nevents], timebuf);

windows/winpgen.c

@@ -1279,14 +1279,12 @@ static int CALLBACK MainDlgProc(HWND hwnd, UINT msg,
 	 */
 	*state->commentptr = snewn(30, char);
 	{
-	    time_t t;
-	    struct tm *tm;
-	    time(&t);
-	    tm = localtime(&t);
+	    struct tm tm;
+	    tm = ltime();
 	    if (state->is_dsa)
-		strftime(*state->commentptr, 30, "dsa-key-%Y%m%d", tm);
+		strftime(*state->commentptr, 30, "dsa-key-%Y%m%d", &tm);
 	    else
-		strftime(*state->commentptr, 30, "rsa-key-%Y%m%d", tm);
+		strftime(*state->commentptr, 30, "rsa-key-%Y%m%d", &tm);
 	}
 
 	/*

windows/wintime.c

@@ -0,0 +1,20 @@
+#include "putty.h"
+#include <time.h>
+
+struct tm ltime(void)
+{
+    SYSTEMTIME st;
+    struct tm tm;
+
+    GetLocalTime(&st);
+    tm.tm_sec=st.wSecond;
+    tm.tm_min=st.wMinute;
+    tm.tm_hour=st.wHour;
+    tm.tm_mday=st.wDay;
+    tm.tm_mon=st.wMonth-1;
+    tm.tm_year=(st.wYear>=1900?st.wYear-1900:0);
+    tm.tm_wday=st.wDayOfWeek;
+    tm.tm_yday=-1; /* GetLocalTime doesn't tell us */
+    tm.tm_isdst=0; /* GetLocalTime doesn't tell us */
+    return tm;
+}