168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/*
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* debug.c - Debugging utilities
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*
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* nspluginwrapper (C) 2005-2009 Gwenole Beauchesne
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "sysdeps.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <errno.h>
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#include "debug.h"
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static int g_indent_level = 0;
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void npw_indent(int inc)
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{
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g_indent_level += inc;
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}
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static int _can_indent_messages(void)
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{
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const char *indent_str = getenv("NPW_INDENT_MESSAGES");
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if (indent_str) {
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// XXX: also check for "yes", "no", "true", "false"
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errno = 0;
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long v = strtol(indent_str, NULL, 10);
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if ((v != LONG_MIN && v != LONG_MAX) || errno != ERANGE)
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return v;
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}
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return 1;
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}
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static inline int get_indent_level(void)
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{
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static int can_indent_messages = -1;
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if (can_indent_messages < 0)
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can_indent_messages = _can_indent_messages();
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if (can_indent_messages)
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return g_indent_level;
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return 0;
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}
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static int _get_debug_level(void)
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{
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const char *debug_str = getenv("NPW_DEBUG");
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if (debug_str) {
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errno = 0;
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long v = strtol(debug_str, NULL, 10);
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if ((v != LONG_MIN && v != LONG_MAX) || errno != ERANGE)
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return v;
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}
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return 0;
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}
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static inline int get_debug_level(void)
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{
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static int g_debug_level = -1;
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if (g_debug_level < 0)
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g_debug_level = _get_debug_level();
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return g_debug_level;
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}
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void npw_dprintf(const char *format, ...)
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{
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if (get_debug_level() > 0) {
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va_list args;
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va_start(args, format);
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npw_vprintf(format, args);
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va_end(args);
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}
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}
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void npw_idprintf(int inc, const char *format, ...)
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{
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if (get_debug_level() > 0) {
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if (inc < 0)
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npw_indent(inc);
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va_list args;
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va_start(args, format);
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npw_vprintf(format, args);
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va_end(args);
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if (inc > 0)
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npw_indent(inc);
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}
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}
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static FILE *g_log_file = NULL;
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static FILE *npw_log_file(void)
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{
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if (g_log_file == NULL) {
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const char *log_file = getenv("NPW_LOG");
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if (log_file) {
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const char *mode = "w";
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#ifdef BUILD_VIEWER
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/* the wrapper plugin has the responsability to create the file,
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thus the viewer is only opening it for appending data. */
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mode = "a";
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#endif
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g_log_file = fopen(log_file, mode);
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}
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if (log_file == NULL)
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g_log_file = stderr;
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}
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if (g_log_file != stderr)
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fseek(g_log_file, 0, SEEK_END);
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return g_log_file;
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}
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static void __attribute__((destructor)) log_file_sentinel(void)
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{
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if (g_log_file && g_log_file != stderr) {
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fclose(g_log_file);
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g_log_file = stderr;
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}
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}
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static void npw_print_indent(FILE *fp)
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{
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static const char blanks[] = " ";
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const int blanks_length = sizeof(blanks) - 1;
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int n_blanks = 2 * get_indent_level();
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for (int i = 0; i < n_blanks / blanks_length; i++)
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fwrite(blanks, blanks_length, 1, fp);
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if ((n_blanks = (n_blanks % blanks_length)) > 0)
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fwrite(blanks, n_blanks, 1, fp);
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}
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void npw_vprintf(const char *format, va_list args)
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{
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FILE *log_file = npw_log_file();
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fprintf(log_file, "*** NSPlugin %s *** ", NPW_COMPONENT_NAME);
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npw_print_indent(log_file);
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vfprintf(log_file, format, args);
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fflush(log_file);
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}
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void npw_printf(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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npw_vprintf(format, args);
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va_end(args);
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}
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