db/output.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "libxfs.h"
   8 #include <stdarg.h>
   9 #include "command.h"
  10 #include "output.h"
  11 #include "sig.h"
  12 #include "malloc.h"
  13 #include "init.h"
  14
  15 static int      log_f(int argc, char **argv);
  16
  17 static const cmdinfo_t  log_cmd =
  18         { "log", NULL, log_f, 0, 2, 0, N_("[stop|start <filename>]"),
  19           N_("start or stop logging to a file"), NULL };
  20
  21 int             dbprefix;
  22 static FILE     *log_file;
  23 static char     *log_file_name;
  24
  25 int
  26 dbprintf(const char *fmt, ...)
  27 {
  28         va_list ap;
  29         int     i;
  30
  31         if (seenint())
  32                 return 0;
  33         va_start(ap, fmt);
  34         blockint();
  35         i = 0;
  36         if (dbprefix)
  37                 i += printf("%s: ", fsdevice);
  38         i += vprintf(fmt, ap);
  39         unblockint();
  40         va_end(ap);
  41         if (log_file) {
  42                 va_start(ap, fmt);
  43                 vfprintf(log_file, fmt, ap);
  44                 va_end(ap);
  45         }
  46         return i;
  47 }
  48
  49 static int
  50 log_f(
  51         int             argc,
  52         char            **argv)
  53 {
  54         if (argc == 1) {
  55                 if (log_file)
  56                         dbprintf(_("logging to %s\n"), log_file_name);
  57                 else
  58                         dbprintf(_("no log file\n"));
  59         } else if (argc == 2 && strcmp(argv[1], "stop") == 0) {
  60                 if (log_file) {
  61                         xfree(log_file_name);
  62                         fclose(log_file);
  63                         log_file = NULL;
  64                 } else
  65                         dbprintf(_("no log file\n"));
  66         } else if (argc == 3 && strcmp(argv[1], "start") == 0) {
  67                 if (log_file)
  68                         dbprintf(_("already logging to %s\n"), log_file_name);
  69                 else {
  70                         log_file = fopen(argv[2], "a");
  71                         if (log_file == NULL)
  72                                 dbprintf(_("can't open %s for writing\n"),
  73                                         argv[2]);
  74                         else
  75                                 log_file_name = xstrdup(argv[1]);
  76                 }
  77         } else
  78                 dbprintf(_("bad log command, ignored\n"));
  79         return 0;
  80 }
  81
  82 void
  83 logprintf(const char *fmt, ...)
  84 {
  85         va_list ap;
  86
  87         if (log_file) {
  88                 va_start(ap, fmt);
  89                 (void)vfprintf(log_file, fmt, ap);
  90                 va_end(ap);
  91         }
  92 }
  93
  94 void
  95 output_init(void)
  96 {
  97         add_command(&log_cmd);
  98 }