indexer rewritten to generate redirect brackets

[libucw.git] / lib / log.c

diff --git a/lib/log.c b/lib/log.c
index 267270aa5c783f64c6209c87fc540d9c3348f4e1..d83a84e4bc43549ac64eb8a7faf196fdb97d6828 100644 (file)
--- a/lib/log.c
+++ b/lib/log.c
@@ -1,49 +1,117 @@
 /*
  *     Sherlock Library -- Logging
  *
- *     (c) 1997 Martin Mares, <mj@atrey.karlin.mff.cuni.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"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <string.h>
+#include <fcntl.h>
 #include <unistd.h>
-#include <sys/time.h>
+#include <time.h>
+#include <alloca.h>
+
+static char log_progname[32], *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)
+{
+  log_pid = getpid();
+}
 
-#include "lib.h"
+static void
+log_switch(struct tm *tm)
+{
+  int fd, l;
+  char name[log_name_size];
 
-static byte *progname = "???";
-static pid_t pid;
+  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
-logit(int level, byte *msg, va_list args)
+vlog(unsigned int cat, const char *msg, va_list args)
 {
-  time_t tim;
-  struct tm *tm;
-  char buf[32];
-
-  tim = time(NULL);
-  tm = localtime(&tim);
-  strftime(buf, sizeof(buf), "%d-%m-%y %H-%M-%S", tm);
-  fprintf(stderr, "%s %s [%d] <%d> ", buf, progname, pid, level);
-  vfprintf(stderr, msg, args);
-  fputc('\n', stderr);
-  fflush(stderr);
+  time_t tim = time(NULL);
+  struct tm *tm = localtime(&tim);
+  byte *buf, *p;
+  int buflen = 256;
+  int l, l0, r;
+
+  log_switch(tm);
+  while (1)
+    {
+      p = buf = alloca(buflen);
+      *p++ = cat;
+      p += strftime(p, buflen, " %Y-%m-%d %H:%M:%S ", tm);
+      if (log_progname[0])
+       {
+         if (log_pid)
+           p += sprintf(p, "[%s (%d)] ", log_progname, log_pid);
+         else
+           p += sprintf(p, "[%s] ", log_progname);
+       }
+      else
+       {
+         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;
+    }
 }
 
 void
-log(byte *msg, ...)
+log_msg(unsigned int cat, const char *msg, ...)
 {
-  int level = 2;
   va_list args;
 
   va_start(args, msg);
-  if (msg[0] == '<' && msg[1] >= '0' && msg[1] <= '9' && msg[2] == '>')
-       {
-         level = msg[1] - '0';
-         msg += 3;
-       }
-  logit(level, msg, args);
+  vlog(cat, msg, args);
   va_end(args);
 }
 
@@ -53,13 +121,28 @@ die(byte *msg, ...)
   va_list args;
 
   va_start(args, msg);
-  logit(9, msg, args);
+  vlog(L_FATAL, msg, args);
   va_end(args);
-  exit(99);
+  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;
 
@@ -70,8 +153,34 @@ basename(byte *n)
 }
 
 void
-initlog(byte *argv0)
+log_init(byte *argv0)
+{
+  if (argv0)
+    {
+      strncpy(log_progname, log_basename(argv0), sizeof(log_progname)-1);
+      log_progname[sizeof(log_progname)-1] = 0;
+    }
+}
+
+void
+log_file(byte *name)
 {
-  progname = basename(argv0);
-  pid = getpid();
+  if (name)
+    {
+      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);
+    }
 }