X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;f=lib%2Flog.c;h=3ab60eb4e8866105c01ccd974aa57b6b2cd57549;hb=54eb231d1d8fcb8b02c56d437152699764bcda3e;hp=16fe4e227f2ef574111953b836075df70fe858f7;hpb=d4541df25261ca6fdd816b6e24d6f526a30afd30;p=libucw.git

diff --git a/lib/log.c b/lib/log.c
index 16fe4e22..3ab60eb4 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -1,7 +1,10 @@
 /*
  *	Sherlock Library -- Logging
  *
- *	(c) 1997--2001 Martin Mares <mj@ucw.cz>
+ *	(c) 1997--2002 Martin Mares <mj@ucw.cz>
+ *
+ *	This software may be freely distributed and used according to the terms
+ *	of the GNU Lesser General Public License.
  */
 
 #include "lib/lib.h"
@@ -9,12 +12,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <time.h>
 
-static char *log_progname;
+static char *log_progname, *log_name_patt, *log_name;
 static pid_t log_pid;
+static int log_params;
+static int log_name_size;
+static int log_switching;
 
 void
 log_fork(void)
@@ -22,30 +29,79 @@ log_fork(void)
   log_pid = getpid();
 }
 
+static void
+log_switch(struct tm *tm)
+{
+  int fd, l;
+  char name[log_name_size];
+
+  if (!log_name_patt ||
+      log_name[0] && !log_params ||
+      log_switching)
+    return;
+  log_switching++;
+  l = strftime(name, log_name_size, log_name_patt, tm);
+  if (l < 0 || l >= log_name_size)
+    die("Error formatting log file name: %m");
+  if (strcmp(name, log_name))
+    {
+      strcpy(log_name, name);
+      fd = open(name, O_WRONLY | O_CREAT | O_APPEND, 0666);
+      if (fd < 0)
+	die("Unable to open log file %s: %m", name);
+      close(2);
+      dup(fd);
+      close(fd);
+    }
+  log_switching--;
+}
+
 static void
 vlog(unsigned int cat, const char *msg, va_list args)
 {
   time_t tim = time(NULL);
   struct tm *tm = localtime(&tim);
-  char buf[32];
+  byte *buf, *p;
+  int buflen = 256;
+  int l, l0, r;
 
-  strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
-  fprintf(stderr, "%c %s ", cat, buf);
-  if (log_progname)
+  log_switch(tm);
+  while (1)
     {
-      if (log_pid)
-	fprintf(stderr, "[%s (%d)] ", log_progname, log_pid);
+      p = buf = alloca(buflen);
+      *p++ = cat;
+      p += strftime(p, buflen, " %Y-%m-%d %H:%M:%S ", tm);
+      if (log_progname)
+	{
+	  if (log_pid)
+	    p += sprintf(p, "[%s (%d)] ", log_progname, log_pid);
+	  else
+	    p += sprintf(p, "[%s] ", log_progname);
+	}
       else
-	fprintf(stderr, "[%s] ", log_progname);
+	{
+	  if (log_pid)
+	    p += sprintf(p, "[%d] ", log_pid);
+	}
+      l0 = p - buf + 1;
+      r = buflen - l0;
+      l = vsnprintf(p, r, msg, args);
+      if (l < 0)
+	l = r;
+      else if (l < r)
+	{
+	  while (*p)
+	    {
+	      if (*p < 0x20 && *p != '\t')
+		*p = 0x7f;
+	      p++;
+	    }
+	  *p = '\n';
+	  write(2, buf, l + l0);
+	  return;
+	}
+      buflen = l + l0 + 1;
     }
-  else
-    {
-      if (log_pid)
-	fprintf(stderr, "[%d] ", log_pid);
-    }
-  vfprintf(stderr, msg, args);
-  fputc('\n', stderr);
-  fflush(stderr);
 }
 
 void
@@ -69,8 +125,23 @@ die(byte *msg, ...)
   exit(1);
 }
 
+#ifdef DEBUG
+void
+assert_failed(char *assertion, char *file, int line)
+{
+  log(L_FATAL, "Assertion `%s' failed at %s:%d", assertion, file, line);
+  abort();
+}
+#else
+void
+assert_failed(void)
+{
+  die("Internal error: Assertion failed.");
+}
+#endif
+
 static byte *
-basename(byte *n)
+log_basename(byte *n)
 {
   byte *p = n;
 
@@ -84,7 +155,7 @@ void
 log_init(byte *argv0)
 {
   if (argv0)
-    log_progname = basename(argv0);
+    log_progname = log_basename(argv0);
 }
 
 void
@@ -92,11 +163,20 @@ log_file(byte *name)
 {
   if (name)
     {
-      int fd = open(name, O_WRONLY | O_CREAT | O_APPEND, 0666);
-      if (fd < 0)
-	die("Unable to open log file %s: %m", name);
-      close(2);
-      dup(fd);
-      close(fd);
+      time_t tim = time(NULL);
+      struct tm *tm = localtime(&tim);
+      if (log_name_patt)
+	xfree(log_name_patt);
+      if (log_name)
+	{
+	  xfree(log_name);
+	  log_name = NULL;
+	}
+      log_name_patt = stralloc(name);
+      log_params = !!strchr(name, '%');
+      log_name_size = strlen(name) + 64;	/* 63 is an upper bound on expansion of % escapes */
+      log_name = xmalloc(log_name_size);
+      log_name[0] = 0;
+      log_switch(tm);
     }
 }