| /* |
| * This file is part of the libsigrokdecode project. |
| * |
| * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <config.h> |
| #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ |
| #include "libsigrokdecode.h" |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <glib/gprintf.h> |
| |
| /** |
| * @file |
| * |
| * Controlling the libsigrokdecode message logging functionality. |
| */ |
| |
| /** |
| * @defgroup grp_logging Logging |
| * |
| * Controlling the libsigrokdecode message logging functionality. |
| * |
| * @{ |
| */ |
| |
| /* Currently selected libsigrokdecode loglevel. Default: SRD_LOG_WARN. */ |
| static int cur_loglevel = SRD_LOG_WARN; /* Show errors+warnings per default. */ |
| |
| /* Function prototype. */ |
| static int srd_logv(void *cb_data, int loglevel, const char *format, |
| va_list args); |
| |
| /* Pointer to the currently selected log callback. Default: srd_logv(). */ |
| static srd_log_callback srd_log_cb = srd_logv; |
| |
| /* |
| * Pointer to private data that can be passed to the log callback. |
| * This can be used (for example) by C++ GUIs to pass a "this" pointer. |
| */ |
| static void *srd_log_cb_data = NULL; |
| |
| /** |
| * Set the libsigrokdecode loglevel. |
| * |
| * This influences the amount of log messages (debug messages, error messages, |
| * and so on) libsigrokdecode will output. Using SRD_LOG_NONE disables all |
| * messages. |
| * |
| * Note that this function itself will also output log messages. After the |
| * loglevel has changed, it will output a debug message with SRD_LOG_DBG for |
| * example. Whether this message is shown depends on the (new) loglevel. |
| * |
| * @param loglevel The loglevel to set (SRD_LOG_NONE, SRD_LOG_ERR, |
| * SRD_LOG_WARN, SRD_LOG_INFO, SRD_LOG_DBG, or SRD_LOG_SPEW). |
| * |
| * @return SRD_OK upon success, SRD_ERR_ARG upon invalid loglevel. |
| * |
| * @since 0.1.0 |
| */ |
| SRD_API int srd_log_loglevel_set(int loglevel) |
| { |
| if (loglevel < SRD_LOG_NONE || loglevel > SRD_LOG_SPEW) { |
| srd_err("Invalid loglevel %d.", loglevel); |
| return SRD_ERR_ARG; |
| } |
| |
| cur_loglevel = loglevel; |
| |
| srd_dbg("libsigrokdecode loglevel set to %d.", loglevel); |
| |
| return SRD_OK; |
| } |
| |
| /** |
| * Get the libsigrokdecode loglevel. |
| * |
| * @return The currently configured libsigrokdecode loglevel. |
| * |
| * @since 0.1.0 |
| */ |
| SRD_API int srd_log_loglevel_get(void) |
| { |
| return cur_loglevel; |
| } |
| |
| /** |
| * Set the libsigrokdecode log callback to the specified function. |
| * |
| * @param cb Function pointer to the log callback function to use. |
| * Must not be NULL. |
| * @param cb_data Pointer to private data to be passed on. This can be used |
| * by the caller to pass arbitrary data to the log functions. |
| * This pointer is only stored or passed on by libsigrokdecode, |
| * and is never used or interpreted in any way. The pointer |
| * is allowed to be NULL if the caller doesn't need/want to |
| * pass any data. |
| * |
| * @return SRD_OK upon success, SRD_ERR_ARG upon invalid arguments. |
| * |
| * @since 0.3.0 |
| */ |
| SRD_API int srd_log_callback_set(srd_log_callback cb, void *cb_data) |
| { |
| if (!cb) { |
| srd_err("log: %s: cb was NULL", __func__); |
| return SRD_ERR_ARG; |
| } |
| |
| /* Note: 'cb_data' is allowed to be NULL. */ |
| |
| srd_log_cb = cb; |
| srd_log_cb_data = cb_data; |
| |
| return SRD_OK; |
| } |
| |
| /** |
| * Get the libsigrokdecode log callback routine and callback data. |
| * |
| * @param[out] cb Pointer to a function pointer to receive the log callback |
| * function. Optional, can be NULL. |
| * @param[out] cb_data Pointer to a void pointer to receive the log callback's |
| * additional arguments. Optional, can be NULL. |
| * |
| * @return SRD_OK upon success. |
| * |
| * @since 0.5.2 |
| */ |
| SRD_API int srd_log_callback_get(srd_log_callback *cb, void **cb_data) |
| { |
| if (cb) |
| *cb = srd_log_cb; |
| if (cb_data) |
| *cb_data = srd_log_cb_data; |
| |
| return SRD_OK; |
| } |
| |
| /** |
| * Set the libsigrokdecode log callback to the default built-in one. |
| * |
| * Additionally, the internal 'srd_log_cb_data' pointer is set to NULL. |
| * |
| * @return SRD_OK upon success, a (negative) error code otherwise. |
| * |
| * @since 0.1.0 |
| */ |
| SRD_API int srd_log_callback_set_default(void) |
| { |
| /* |
| * Note: No log output in this function, as it should safely work |
| * even if the currently set log callback is buggy/broken. |
| */ |
| srd_log_cb = srd_logv; |
| srd_log_cb_data = NULL; |
| |
| return SRD_OK; |
| } |
| |
| static int srd_logv(void *cb_data, int loglevel, const char *format, |
| va_list args) |
| { |
| /* This specific log callback doesn't need the void pointer data. */ |
| (void)cb_data; |
| |
| (void)loglevel; |
| |
| if (fputs("srd: ", stderr) < 0 |
| || g_vfprintf(stderr, format, args) < 0 |
| || putc('\n', stderr) < 0) |
| return SRD_ERR; |
| |
| fflush(stderr); |
| |
| return SRD_OK; |
| } |
| |
| /** @private */ |
| SRD_PRIV int srd_log(int loglevel, const char *format, ...) |
| { |
| int ret; |
| va_list args; |
| |
| /* Only output messages of at least the selected loglevel(s). */ |
| if (loglevel > cur_loglevel) |
| return SRD_OK; |
| |
| va_start(args, format); |
| ret = srd_log_cb(srd_log_cb_data, loglevel, format, args); |
| va_end(args); |
| |
| return ret; |
| } |
| |
| /** @} */ |