X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/d5c0d8c9374623620844d539d4810da63e9abca1..7adc9ca07a9a870f92a14d16740abfecde0bdfa4:/src/src/log.c

diff --git a/src/src/log.c b/src/src/log.c
index ddd71377e..99eba5f90 100644
--- a/src/src/log.c
+++ b/src/src/log.c
@@ -2,7 +2,8 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Functions for writing log files. The code for maintaining datestamped
@@ -112,6 +113,7 @@ static const uschar * exim_errstrings[] = {
   US"Local-only delivery",
   US"Domain in queue_domains",
   US"Transport concurrency limit",
+  US"Event requests alternate response",
 };
 
 
@@ -134,33 +136,36 @@ can get here if there is a failure to open the panic log.)
 
 Arguments:
   priority       syslog priority
-  s              the string to be written, the string may be modified!
+  s              the string to be written
 
 Returns:         nothing
 */
 
 static void
-write_syslog(int priority, uschar *s)
+write_syslog(int priority, const uschar *s)
 {
-int len, pass;
+int len;
 int linecount = 0;
 
-if (running_in_test_harness) return;
-
-if (!syslog_timestamp) s += log_timezone? 26 : 20;
 if (!syslog_pid && LOGGING(pid))
-    memmove(s + pid_position[0], s + pid_position[1], pid_position[1] - pid_position[0]);
+  s = string_sprintf("%.*s%s", (int)pid_position[0], s, s + pid_position[1]);
+if (!syslog_timestamp)
+  {
+  len = log_timezone ? 26 : 20;
+  if (LOGGING(millisec)) len += 4;
+  s += len;
+  }
 
 len = Ustrlen(s);
 
 #ifndef NO_OPENLOG
-if (!syslog_open)
+if (!syslog_open && !f.running_in_test_harness)
   {
-  #ifdef SYSLOG_LOG_PID
+# ifdef SYSLOG_LOG_PID
   openlog(CS syslog_processname, LOG_PID|LOG_CONS, syslog_facility);
-  #else
+# else
   openlog(CS syslog_processname, LOG_CONS, syslog_facility);
-  #endif
+# endif
   syslog_open = TRUE;
   }
 #endif
@@ -168,31 +173,37 @@ if (!syslog_open)
 /* First do a scan through the message in order to determine how many lines
 it is going to end up as. Then rescan to output it. */
 
-for (pass = 0; pass < 2; pass++)
+for (int pass = 0; pass < 2; pass++)
   {
-  int i;
-  int tlen;
-  uschar *ss = s;
-  for (i = 1, tlen = len; tlen > 0; i++)
+  const uschar * ss = s;
+  for (int i = 1, tlen = len; tlen > 0; i++)
     {
     int plen = tlen;
     uschar *nlptr = Ustrchr(ss, '\n');
     if (nlptr != NULL) plen = nlptr - ss;
-    #ifndef SYSLOG_LONG_LINES
+#ifndef SYSLOG_LONG_LINES
     if (plen > MAX_SYSLOG_LEN) plen = MAX_SYSLOG_LEN;
-    #endif
+#endif
     tlen -= plen;
     if (ss[plen] == '\n') tlen--;    /* chars left */
 
-    if (pass == 0) linecount++; else
-      {
+    if (pass == 0)
+      linecount++;
+    else if (f.running_in_test_harness)
+      if (linecount == 1)
+        fprintf(stderr, "SYSLOG: '%.*s'\n", plen, ss);
+      else
+        fprintf(stderr, "SYSLOG: '[%d%c%d] %.*s'\n", i,
+          ss[plen] == '\n' && tlen != 0 ? '\\' : '/',
+          linecount, plen, ss);
+    else
       if (linecount == 1)
         syslog(priority, "%.*s", plen, ss);
       else
         syslog(priority, "[%d%c%d] %.*s", i,
-          (ss[plen] == '\n' && tlen != 0)? '\\' : '/',
+          ss[plen] == '\n' && tlen != 0 ? '\\' : '/',
           linecount, plen, ss);
-      }
+
     ss += plen;
     if (*ss == '\n') ss++;
     }
@@ -223,14 +234,14 @@ Returns:     The function does not return
 static void
 die(uschar *s1, uschar *s2)
 {
-if (s1 != NULL)
+if (s1)
   {
   write_syslog(LOG_CRIT, s1);
-  if (debug_file != NULL) debug_printf("%s\n", s1);
-  if (log_stderr != NULL && log_stderr != debug_file)
+  if (debug_file) debug_printf("%s\n", s1);
+  if (log_stderr && log_stderr != debug_file)
     fprintf(log_stderr, "%s\n", s1);
   }
-if (receive_call_bombout) receive_bomb_out(NULL, s2);  /* does not return */
+if (f.receive_call_bombout) receive_bomb_out(NULL, s2);  /* does not return */
 if (smtp_input) smtp_closedown(s2);
 exim_exit(EXIT_FAILURE);
 }
@@ -272,7 +283,7 @@ if (fd < 0 && errno == ENOENT)
   *lastslash = 0;
   created = directory_make(NULL, name, LOG_DIRECTORY_MODE, FALSE);
   DEBUG(D_any) debug_printf("%s log directory %s\n",
-    created? "created" : "failed to create", name);
+    created ? "created" : "failed to create", name);
   *lastslash = '/';
   if (created) fd = Uopen(name,
 #ifdef O_CLOEXEC
@@ -303,7 +314,7 @@ Returns:       a file descriptor, or < 0 on failure (errno set)
 int
 log_create_as_exim(uschar *name)
 {
-pid_t pid = fork();
+pid_t pid = exim_fork(US"logfile-create");
 int status = 1;
 int fd = -1;
 
@@ -391,7 +402,7 @@ it gets statted to see if it has been cycled. With a datestamp, the datestamp
 will be compared. The static slot for saving it is the same size as buffer,
 and the text has been checked above to fit, so this use of strcpy() is OK. */
 
-if (type == lt_main)
+if (type == lt_main && string_datestamp_offset >= 0)
   {
   Ustrcpy(mainlog_name, buffer);
   mainlog_datestamp = mainlog_name + string_datestamp_offset;
@@ -399,7 +410,7 @@ if (type == lt_main)
 
 /* Ditto for the reject log */
 
-else if (type == lt_reject)
+else if (type == lt_reject && string_datestamp_offset >= 0)
   {
   Ustrcpy(rejectlog_name, buffer);
   rejectlog_datestamp = rejectlog_name + string_datestamp_offset;
@@ -427,29 +438,26 @@ char afterwards if at the start, otherwise one before. */
 
 else if (string_datestamp_offset >= 0)
   {
-  uschar *from = buffer + string_datestamp_offset;
-  uschar *to = from + string_datestamp_length;
+  uschar * from = buffer + string_datestamp_offset;
+  uschar * to = from + string_datestamp_length;
+
   if (from == buffer || from[-1] == '/')
     {
     if (!isalnum(*to)) to++;
     }
   else
-    {
     if (!isalnum(from[-1])) from--;
-    }
 
-  /* This strcpy is ok, because we know that to is a substring of from. */
-
-  Ustrcpy(from, to);
+  /* This copy is ok, because we know that to is a substring of from. But
+  due to overlap we must use memmove() not Ustrcpy(). */
+  memmove(from, to, Ustrlen(to)+1);
   }
 
 /* If the file name is too long, it is an unrecoverable disaster */
 
 if (!ok)
-  {
   die(US"exim: log file path too long: aborting",
       US"Logging failure; please try later");
-  }
 
 /* We now have the file name. Try to open an existing file. After a successful
 open, arrange for automatic closure on exec(), and then return. */
@@ -503,7 +511,7 @@ non-setuid binary with log_arguments set, called in certain ways.) Rather than
 just bombing out, force the log to stderr and carry on if stderr is available.
 */
 
-if (euid != root_uid && euid != exim_uid && log_stderr != NULL)
+if (euid != root_uid && euid != exim_uid && log_stderr)
   {
   *fd = fileno(log_stderr);
   return;
@@ -512,7 +520,9 @@ if (euid != root_uid && euid != exim_uid && log_stderr != NULL)
 /* Otherwise this is a disaster. This call is deliberately ONLY to the panic
 log. If possible, save a copy of the original line that was being logged. If we
 are recursing (can't open the panic log either), the pointer will already be
-set. */
+set.  Also, when we had to use a subprocess for the create we didn't retrieve
+errno from it, so get the error from the open attempt above (which is often
+meaningful enough, so leave it). */
 
 if (!panic_save_buffer)
   if ((panic_save_buffer = US malloc(LOG_BUFFER_SIZE)))
@@ -546,26 +556,18 @@ Arguments:
 Returns:      updated pointer
 */
 
-static uschar *
-log_config_info(uschar *ptr, int flags)
+static gstring *
+log_config_info(gstring * g, int flags)
 {
-Ustrcpy(ptr, "Exim configuration error");
-ptr += 24;
+g = string_cat(g, US"Exim configuration error");
 
-if ((flags & (LOG_CONFIG_FOR & ~LOG_CONFIG)) != 0)
-  {
-  Ustrcpy(ptr, " for ");
-  return ptr + 5;
-  }
+if (flags & (LOG_CONFIG_FOR & ~LOG_CONFIG))
+  return string_cat(g, US" for ");
 
-if ((flags & (LOG_CONFIG_IN & ~LOG_CONFIG)) != 0)
-  {
-  sprintf(CS ptr, " in line %d of %s", config_lineno, config_filename);
-  while (*ptr) ptr++;
-  }
+if (flags & (LOG_CONFIG_IN & ~LOG_CONFIG))
+  g = string_fmt_append(g, " in line %d of %s", config_lineno, config_filename);
 
-Ustrcpy(ptr, ":\n  ");
-return ptr + 4;
+return string_catn(g, US":\n  ", 4);
 }
 
 
@@ -736,10 +738,10 @@ Returns:    nothing
 void
 log_write(unsigned int selector, int flags, const char *format, ...)
 {
-uschar *ptr;
-int length;
 int paniclogfd;
 ssize_t written_len;
+gstring gs = { .size = LOG_BUFFER_SIZE-1, .ptr = 0, .s = log_buffer };
+gstring * g;
 va_list ap;
 
 /* If panic_recurseflag is set, we have failed to open the panic log. This is
@@ -749,11 +751,11 @@ original log line that caused the problem. Afterwards, expire. */
 
 if (panic_recurseflag)
   {
-  uschar *extra = (panic_save_buffer == NULL)? US"" : panic_save_buffer;
-  if (debug_file != NULL) debug_printf("%s%s", extra, log_buffer);
-  if (log_stderr != NULL && log_stderr != debug_file)
+  uschar *extra = panic_save_buffer ? panic_save_buffer : US"";
+  if (debug_file) debug_printf("%s%s", extra, log_buffer);
+  if (log_stderr && log_stderr != debug_file)
     fprintf(log_stderr, "%s%s", extra, log_buffer);
-  if (*extra != 0) write_syslog(LOG_CRIT, extra);
+  if (*extra) write_syslog(LOG_CRIT, extra);
   write_syslog(LOG_CRIT, log_buffer);
   die(US"exim: could not open panic log - aborting: see message(s) above",
     US"Unexpected log failure, please try later");
@@ -790,12 +792,14 @@ if (!path_inspected)
     int sep = ':';              /* Fixed separator - outside use */
     uschar *s;
     const uschar *ss = log_file_path;
+
     logging_mode = 0;
     while ((s = string_nextinlist(&ss, &sep, log_buffer, LOG_BUFFER_SIZE)))
       {
       if (Ustrcmp(s, "syslog") == 0)
         logging_mode |= LOG_MODE_SYSLOG;
-      else if ((logging_mode & LOG_MODE_FILE) != 0) multiple = TRUE;
+      else if (logging_mode & LOG_MODE_FILE)
+	multiple = TRUE;
       else
         {
         logging_mode |= LOG_MODE_FILE;
@@ -825,7 +829,7 @@ if (!path_inspected)
   /* Set up the ultimate default if necessary. Then revert to the old store
   pool, and record that we've sorted out the path. */
 
-  if ((logging_mode & LOG_MODE_FILE) != 0 && file_path[0] == 0)
+  if (logging_mode & LOG_MODE_FILE  &&  !file_path[0])
     file_path = string_sprintf("%s/log/%%slog", spool_directory);
   store_pool = old_pool;
   path_inspected = TRUE;
@@ -844,10 +848,8 @@ in one go so that it doesn't get split when multi-processing. */
 DEBUG(D_any|D_v)
   {
   int i;
-  ptr = log_buffer;
 
-  Ustrcpy(ptr, "LOG:");
-  ptr += 4;
+  g = string_catn(&gs, US"LOG:", 4);
 
   /* Show the selector that was passed into the call. */
 
@@ -855,41 +857,47 @@ DEBUG(D_any|D_v)
     {
     unsigned int bitnum = log_options[i].bit;
     if (bitnum < BITWORDSIZE && selector == BIT(bitnum))
-      {
-      *ptr++ = ' ';
-      Ustrcpy(ptr, log_options[i].name);
-      while (*ptr) ptr++;
-      }
+      g = string_fmt_append(g, " %s", log_options[i].name);
     }
 
-  sprintf(CS ptr, "%s%s%s%s\n  ",
-    ((flags & LOG_MAIN) != 0)?    " MAIN"   : "",
-    ((flags & LOG_PANIC) != 0)?   " PANIC"  : "",
-    ((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE)? " DIE" : "",
-    ((flags & LOG_REJECT) != 0)?  " REJECT" : "");
+  g = string_fmt_append(g, "%s%s%s%s\n  ",
+    flags & LOG_MAIN ?    " MAIN"   : "",
+    flags & LOG_PANIC ?   " PANIC"  : "",
+    (flags & LOG_PANIC_DIE) == LOG_PANIC_DIE ? " DIE" : "",
+    flags & LOG_REJECT ?  " REJECT" : "");
+
+  if (flags & LOG_CONFIG) g = log_config_info(g, flags);
 
-  while(*ptr) ptr++;
-  if ((flags & LOG_CONFIG) != 0) ptr = log_config_info(ptr, flags);
+  /* We want to be able to log tainted info, but log_buffer is directly
+  malloc'd.  So use deliberately taint-nonchecking routines to build into
+  it, trusting that we will never expand the results. */
 
   va_start(ap, format);
-  if (!string_vformat(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer)-1, format, ap))
-    Ustrcpy(ptr, "**** log string overflowed log buffer ****");
+  i = g->ptr;
+  if (!string_vformat(g, SVFMT_TAINT_NOCHK, format, ap))
+    {
+    g->ptr = i;
+    g = string_cat(g, US"**** log string overflowed log buffer ****");
+    }
   va_end(ap);
 
-  while(*ptr) ptr++;
-  Ustrcat(ptr, "\n");
-  debug_printf("%s", log_buffer);
-  }
+  g->size = LOG_BUFFER_SIZE;
+  g = string_catn(g, US"\n", 1);
+  debug_printf("%s", string_from_gstring(g));
 
+  gs.size = LOG_BUFFER_SIZE-1;	/* Having used the buffer for debug output, */
+  gs.ptr = 0;			/* reset it for the real use. */
+  gs.s = log_buffer;
+  }
 /* If no log file is specified, we are in a mess. */
 
-if ((flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT)) == 0)
+if (!(flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT)))
   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "log_write called with no log "
     "flags set");
 
 /* There are some weird circumstances in which logging is disabled. */
 
-if (disable_logging)
+if (f.disable_logging)
   {
   DEBUG(D_any) debug_printf("log writing disabled\n");
   return;
@@ -902,79 +910,80 @@ if (!write_rejectlog) flags &= ~LOG_REJECT;
 /* Create the main message in the log buffer. Do not include the message id
 when called by a utility. */
 
-ptr = log_buffer;
-sprintf(CS ptr, "%s ", tod_stamp(tod_log));
-while(*ptr) ptr++;
+g = string_fmt_append(&gs, "%s ", tod_stamp(tod_log));
 
 if (LOGGING(pid))
   {
-  sprintf(CS ptr, "[%d] ", (int)getpid());
-  if (!syslog_pid) pid_position[0] = ptr - log_buffer;	/* remember begin … */
-  while (*ptr) ptr++;
-  if (!syslog_pid) pid_position[1] = ptr - log_buffer;	/*  … and end+1 of the PID */
+  if (!syslog_pid) pid_position[0] = g->ptr;		/* remember begin … */
+  g = string_fmt_append(g, "[%d] ", (int)getpid());
+  if (!syslog_pid) pid_position[1] = g->ptr;		/*  … and end+1 of the PID */
   }
 
-if (really_exim && message_id[0] != 0)
-  {
-  sprintf(CS ptr, "%s ", message_id);
-  while(*ptr) ptr++;
-  }
+if (f.really_exim && message_id[0] != 0)
+  g = string_fmt_append(g, "%s ", message_id);
 
-if ((flags & LOG_CONFIG) != 0) ptr = log_config_info(ptr, flags);
+if (flags & LOG_CONFIG)
+  g = log_config_info(g, flags);
 
 va_start(ap, format);
-if (!string_vformat(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer)-1, format, ap))
-  Ustrcpy(ptr, "**** log string overflowed log buffer ****\n");
-while(*ptr) ptr++;
+  {
+  int i = g->ptr;
+
+  /* We want to be able to log tainted info, but log_buffer is directly
+  malloc'd.  So use deliberately taint-nonchecking routines to build into
+  it, trusting that we will never expand the results. */
+
+  if (!string_vformat(g, SVFMT_TAINT_NOCHK, format, ap))
+    {
+    g->ptr = i;
+    g = string_cat(g, US"**** log string overflowed log buffer ****\n");
+    }
+  }
 va_end(ap);
 
 /* Add the raw, unrewritten, sender to the message if required. This is done
 this way because it kind of fits with LOG_RECIPIENTS. */
 
-if ((flags & LOG_SENDER) != 0 &&
-    ptr < log_buffer + LOG_BUFFER_SIZE - 10 - Ustrlen(raw_sender))
-  {
-  sprintf(CS ptr, " from <%s>", raw_sender);
-  while (*ptr) ptr++;
-  }
+if (   flags & LOG_SENDER
+   && g->ptr < LOG_BUFFER_SIZE - 10 - Ustrlen(raw_sender))
+  g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " from <%s>", raw_sender);
 
 /* Add list of recipients to the message if required; the raw list,
 before rewriting, was saved in raw_recipients. There may be none, if an ACL
 discarded them all. */
 
-if ((flags & LOG_RECIPIENTS) != 0 && ptr < log_buffer + LOG_BUFFER_SIZE - 6 &&
-     raw_recipients_count > 0)
+if (  flags & LOG_RECIPIENTS
+   && g->ptr < LOG_BUFFER_SIZE - 6
+   && raw_recipients_count > 0)
   {
   int i;
-  sprintf(CS ptr, " for");
-  while (*ptr) ptr++;
+  g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " for", NULL);
   for (i = 0; i < raw_recipients_count; i++)
     {
-    uschar *s = raw_recipients[i];
-    if (log_buffer + LOG_BUFFER_SIZE - ptr < Ustrlen(s) + 3) break;
-    sprintf(CS ptr, " %s", s);
-    while (*ptr) ptr++;
+    uschar * s = raw_recipients[i];
+    if (LOG_BUFFER_SIZE - g->ptr < Ustrlen(s) + 3) break;
+    g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " %s", s);
     }
   }
 
-sprintf(CS  ptr, "\n");
-while(*ptr) ptr++;
-length = ptr - log_buffer;
+g = string_catn(g, US"\n", 1);
+string_from_gstring(g);
 
 /* Handle loggable errors when running a utility, or when address testing.
 Write to log_stderr unless debugging (when it will already have been written),
 or unless there is no log_stderr (expn called from daemon, for example). */
 
-if (!really_exim || log_testing_mode)
+if (!f.really_exim || f.log_testing_mode)
   {
-  if (debug_selector == 0 && log_stderr != NULL &&
-      (selector == 0 || (selector & log_selector[0]) != 0))
-    {
+  if (  !debug_selector
+     && log_stderr
+     && (selector == 0 || (selector & log_selector[0]) != 0)
+    )
     if (host_checking)
       fprintf(log_stderr, "LOG: %s", CS(log_buffer + 20));  /* no timestamp */
     else
       fprintf(log_stderr, "%s", CS log_buffer);
-    }
+
   if ((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE) exim_exit(EXIT_FAILURE);
   return;
   }
@@ -1000,7 +1009,7 @@ if (  flags & LOG_MAIN
     operation. This happens at midnight, at which point we want to roll over
     the file. Closing it has the desired effect. */
 
-    if (mainlog_datestamp != NULL)
+    if (mainlog_datestamp)
       {
       uschar *nowstamp = tod_stamp(string_datestamp_type);
       if (Ustrncmp (mainlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
@@ -1031,10 +1040,10 @@ if (  flags & LOG_MAIN
 
     /* Failing to write to the log is disastrous */
 
-    written_len = write_to_fd_buf(mainlogfd, log_buffer, length);
-    if (written_len != length)
+    written_len = write_to_fd_buf(mainlogfd, g->s, g->ptr);
+    if (written_len != g->ptr)
       {
-      log_write_failed(US"main log", length, written_len);
+      log_write_failed(US"main log", g->ptr, written_len);
       /* That function does not return */
       }
     }
@@ -1045,80 +1054,74 @@ which case the flags are altered above. If there are any header lines (i.e. if
 the rejection is happening after the DATA phase), log the recipients and the
 headers. */
 
-if ((flags & LOG_REJECT) != 0)
+if (flags & LOG_REJECT)
   {
-  header_line *h;
-
-  if (header_list != NULL && LOGGING(rejected_header))
+  if (header_list && LOGGING(rejected_header))
     {
+    gstring * g2;
+    int i;
+
     if (recipients_count > 0)
       {
-      int i;
-
       /* List the sender */
 
-      string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer),
-        "Envelope-from: <%s>\n", sender_address);
-      while (*ptr) ptr++;
+      g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
+			"Envelope-from: <%s>\n", sender_address);
+      if (g2) g = g2;
 
       /* List up to 5 recipients */
 
-      string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer),
-        "Envelope-to: <%s>\n", recipients_list[0].address);
-      while (*ptr) ptr++;
+      g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
+			"Envelope-to: <%s>\n", recipients_list[0].address);
+      if (g2) g = g2;
 
       for (i = 1; i < recipients_count && i < 5; i++)
         {
-        string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), "    <%s>\n",
-          recipients_list[i].address);
-        while (*ptr) ptr++;
+        g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
+			"    <%s>\n", recipients_list[i].address);
+	if (g2) g = g2;
         }
 
       if (i < recipients_count)
         {
-        (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer),
-          "    ...\n");
-        while (*ptr) ptr++;
+        g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "    ...\n", NULL);
+	if (g2) g = g2;
         }
       }
 
     /* A header with a NULL text is an unfilled in Received: header */
 
-    for (h = header_list; h != NULL; h = h->next)
+    for (header_line * h = header_list; h; h = h->next) if (h->text)
       {
-      BOOL fitted;
-      if (h->text == NULL) continue;
-      fitted = string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer),
-        "%c %s", h->type, h->text);
-      while(*ptr) ptr++;
-      if (!fitted)         /* Buffer is full; truncate */
+      g2 = string_fmt_append_f(g, SVFMT_TAINT_NOCHK,
+			"%c %s", h->type, h->text);
+      if (g2)
+	g = g2;
+      else		/* Buffer is full; truncate */
         {
-        ptr -= 100;        /* For message and separator */
-        if (ptr[-1] == '\n') ptr--;
-        Ustrcpy(ptr, "\n*** truncated ***\n");
-        while (*ptr) ptr++;
+        g->ptr -= 100;        /* For message and separator */
+        if (g->s[g->ptr-1] == '\n') g->ptr--;
+        g = string_cat(g, US"\n*** truncated ***\n");
         break;
         }
       }
-
-    length = ptr - log_buffer;
     }
 
   /* Write to syslog or to a log file */
 
-  if ((logging_mode & LOG_MODE_SYSLOG) != 0 &&
-      (syslog_duplication || (flags & LOG_PANIC) == 0))
-    write_syslog(LOG_NOTICE, log_buffer);
+  if (  logging_mode & LOG_MODE_SYSLOG
+     && (syslog_duplication || !(flags & LOG_PANIC)))
+    write_syslog(LOG_NOTICE, string_from_gstring(g));
 
   /* Check for a change to the rejectlog file name when datestamping is in
   operation. This happens at midnight, at which point we want to roll over
   the file. Closing it has the desired effect. */
 
-  if ((logging_mode & LOG_MODE_FILE) != 0)
+  if (logging_mode & LOG_MODE_FILE)
     {
     struct stat statbuf;
 
-    if (rejectlog_datestamp != NULL)
+    if (rejectlog_datestamp)
       {
       uschar *nowstamp = tod_stamp(string_datestamp_type);
       if (Ustrncmp (rejectlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
@@ -1136,7 +1139,6 @@ if ((flags & LOG_REJECT) != 0)
     happening. */
 
     if (rejectlogfd >= 0)
-      {
       if (Ustat(rejectlog_name, &statbuf) < 0 ||
            statbuf.st_ino != rejectlog_inode)
         {
@@ -1144,7 +1146,6 @@ if ((flags & LOG_REJECT) != 0)
         rejectlogfd = -1;
         rejectlog_inode = 0;
         }
-      }
 
     /* Open the file if necessary, and write the data */
 
@@ -1154,10 +1155,10 @@ if ((flags & LOG_REJECT) != 0)
       if (fstat(rejectlogfd, &statbuf) >= 0) rejectlog_inode = statbuf.st_ino;
       }
 
-    written_len = write_to_fd_buf(rejectlogfd, log_buffer, length);
-    if (written_len != length)
+    written_len = write_to_fd_buf(rejectlogfd, g->s, g->ptr);
+    if (written_len != g->ptr)
       {
-      log_write_failed(US"reject log", length, written_len);
+      log_write_failed(US"reject log", g->ptr, written_len);
       /* That function does not return */
       }
     }
@@ -1169,39 +1170,37 @@ open, there will be a recursive call to log_write(). We detect this above and
 attempt to write to the system log as a last-ditch try at telling somebody. In
 all cases except mua_wrapper, try to write to log_stderr. */
 
-if ((flags & LOG_PANIC) != 0)
+if (flags & LOG_PANIC)
   {
-  if (log_stderr != NULL && log_stderr != debug_file && !mua_wrapper)
-    fprintf(log_stderr, "%s", CS log_buffer);
+  if (log_stderr && log_stderr != debug_file && !mua_wrapper)
+    fprintf(log_stderr, "%s", CS string_from_gstring(g));
 
-  if ((logging_mode & LOG_MODE_SYSLOG) != 0)
-    {
+  if (logging_mode & LOG_MODE_SYSLOG)
     write_syslog(LOG_ALERT, log_buffer);
-    }
 
   /* If this panic logging was caused by a failure to open the main log,
   the original log line is in panic_save_buffer. Make an attempt to write it. */
 
-  if ((logging_mode & LOG_MODE_FILE) != 0)
+  if (logging_mode & LOG_MODE_FILE)
     {
     panic_recurseflag = TRUE;
     open_log(&paniclogfd, lt_panic, NULL);  /* Won't return on failure */
     panic_recurseflag = FALSE;
 
-    if (panic_save_buffer != NULL)
+    if (panic_save_buffer)
       {
       int i = write(paniclogfd, panic_save_buffer, Ustrlen(panic_save_buffer));
       i = i;	/* compiler quietening */
       }
 
-    written_len = write_to_fd_buf(paniclogfd, log_buffer, length);
-    if (written_len != length)
+    written_len = write_to_fd_buf(paniclogfd, g->s, g->ptr);
+    if (written_len != g->ptr)
       {
       int save_errno = errno;
       write_syslog(LOG_CRIT, log_buffer);
       sprintf(CS log_buffer, "write failed on panic log: length=%d result=%d "
-        "errno=%d (%s)", length, (int)written_len, save_errno, strerror(save_errno));
-      write_syslog(LOG_CRIT, log_buffer);
+        "errno=%d (%s)", g->ptr, (int)written_len, save_errno, strerror(save_errno));
+      write_syslog(LOG_CRIT, string_from_gstring(g));
       flags |= LOG_PANIC_DIE;
       }
 
@@ -1300,14 +1299,14 @@ decode_bits(unsigned int *selector, size_t selsize, int *notall,
   uschar *string, bit_table *options, int count, uschar *which, int flags)
 {
 uschar *errmsg;
-if (string == NULL) return;
+if (!string) return;
 
 if (*string == '=')
   {
   char *end;    /* Not uschar */
   memset(selector, 0, sizeof(*selector)*selsize);
   *selector = strtoul(CS string+1, &end, 0);
-  if (*end == 0) return;
+  if (!*end) return;
   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
     string);
   goto ERROR_RETURN;
@@ -1322,8 +1321,8 @@ else for(;;)
   int len;
   bit_table *start, *end;
 
-  while (isspace(*string)) string++;
-  if (*string == 0) return;
+  Uskip_whitespace(&string);
+  if (!*string) return;
 
   if (*string != '+' && *string != '-')
     {
@@ -1345,7 +1344,6 @@ else for(;;)
     bit_table *middle = start + (end - start)/2;
     int c = Ustrncmp(s, middle->name, len);
     if (c == 0)
-      {
       if (middle->name[len] != 0) c = -1; else
         {
         unsigned int bit = middle->bit;
@@ -1367,7 +1365,6 @@ else for(;;)
 
         break;  /* Out of loop to match selector name */
         }
-      }
     if (c < 0) end = middle; else start = middle + 1;
     }  /* Loop to match selector name */