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debug.c
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/*
 * MUSCLE SmartCard Development ( http://www.linuxnet.com )
 *
 * Copyright (C) 1999-2002
 *  David Corcoran <corcoran@linuxnet.com>
 * Copyright (C) 2002-2011
 *  Ludovic Rousseau <ludovic.rousseau@free.fr>
 *
 * $Id: debug.c 5898 2011-08-21 13:53:27Z rousseau $
 */

/**
 * @file
 * @brief This handles debugging for libpcsclite.
 */

#include "config.h"
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>

#include "debuglog.h"
#include "strlcpycat.h"

#define DEBUG_BUF_SIZE 2048

#ifdef NO_LOG

void log_msg(const int priority, const char *fmt, ...)
{
      (void)priority;
      (void)fmt;
}

#else

/** default level is quiet to avoid polluting fd 2 (possibly NOT stderr) */
00040 static char LogLevel = PCSC_LOG_CRITICAL+1;

00042 static signed char LogDoColor = 0;  /**< no color by default */

static void log_init(void)
{
      char *e;

#ifdef LIBPCSCLITE
      e = getenv("PCSCLITE_DEBUG");
#else
      e = getenv("MUSCLECARD_DEBUG");
#endif
      if (e)
            LogLevel = atoi(e);

      /* log to stderr and stderr is a tty? */
      if (isatty(fileno(stderr)))
      {
            const char *terms[] = { "linux", "xterm", "xterm-color", "Eterm", "rxvt", "rxvt-unicode" };
            char *term;

            term = getenv("TERM");
            if (term)
            {
                  unsigned int i;

                  /* for each known color terminal */
                  for (i = 0; i < sizeof(terms) / sizeof(terms[0]); i++)
                  {
                        /* we found a supported term? */
                        if (0 == strcmp(terms[i], term))
                        {
                              LogDoColor = 1;
                              break;
                        }
                  }
            }
      }
} /* log_init */

void log_msg(const int priority, const char *fmt, ...)
{
      char DebugBuffer[DEBUG_BUF_SIZE];
      va_list argptr;
      static int is_initialized = 0;

      if (!is_initialized)
      {
            log_init();
            is_initialized = 1;
      }

      if (priority < LogLevel) /* log priority lower than threshold? */
            return;

      va_start(argptr, fmt);
      (void)vsnprintf(DebugBuffer, DEBUG_BUF_SIZE, fmt, argptr);
      va_end(argptr);

      {
            if (LogDoColor)
            {
                  const char *color_pfx = "", *color_sfx = "\33[0m";

                  switch (priority)
                  {
                        case PCSC_LOG_CRITICAL:
                              color_pfx = "\33[01;31m"; /* bright + Red */
                              break;

                        case PCSC_LOG_ERROR:
                              color_pfx = "\33[35m"; /* Magenta */
                              break;

                        case PCSC_LOG_INFO:
                              color_pfx = "\33[34m"; /* Blue */
                              break;

                        case PCSC_LOG_DEBUG:
                              color_pfx = ""; /* normal (black) */
                              color_sfx = "";
                              break;
                  }
                  fprintf(stderr, "%s%s%s\n", color_pfx, DebugBuffer, color_sfx);
            }
            else
                  fprintf(stderr, "%s\n", DebugBuffer);
      }
} /* log_msg */

#endif


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