2 * This file is part of the libsigrokdecode project.
4 * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
22 #include "libsigrokdecode.h"
25 #include <glib/gprintf.h>
30 * Controlling the libsigrokdecode message logging functionality.
34 * @defgroup grp_logging Logging
36 * Controlling the libsigrokdecode message logging functionality.
41 /* Currently selected libsigrokdecode loglevel. Default: SRD_LOG_WARN. */
42 static int cur_loglevel = SRD_LOG_WARN; /* Show errors+warnings per default. */
44 /* Function prototype. */
45 static int srd_logv(void *cb_data, int loglevel, const char *format,
48 /* Pointer to the currently selected log callback. Default: srd_logv(). */
49 static srd_log_callback srd_log_cb = srd_logv;
52 * Pointer to private data that can be passed to the log callback.
53 * This can be used (for example) by C++ GUIs to pass a "this" pointer.
55 static void *srd_log_cb_data = NULL;
58 * Set the libsigrokdecode loglevel.
60 * This influences the amount of log messages (debug messages, error messages,
61 * and so on) libsigrokdecode will output. Using SRD_LOG_NONE disables all
64 * Note that this function itself will also output log messages. After the
65 * loglevel has changed, it will output a debug message with SRD_LOG_DBG for
66 * example. Whether this message is shown depends on the (new) loglevel.
68 * @param loglevel The loglevel to set (SRD_LOG_NONE, SRD_LOG_ERR,
69 * SRD_LOG_WARN, SRD_LOG_INFO, SRD_LOG_DBG, or SRD_LOG_SPEW).
71 * @return SRD_OK upon success, SRD_ERR_ARG upon invalid loglevel.
75 SRD_API int srd_log_loglevel_set(int loglevel)
77 if (loglevel < SRD_LOG_NONE || loglevel > SRD_LOG_SPEW) {
78 srd_err("Invalid loglevel %d.", loglevel);
82 cur_loglevel = loglevel;
84 srd_dbg("libsigrokdecode loglevel set to %d.", loglevel);
90 * Get the libsigrokdecode loglevel.
92 * @return The currently configured libsigrokdecode loglevel.
96 SRD_API int srd_log_loglevel_get(void)
102 * Set the libsigrokdecode log callback to the specified function.
104 * @param cb Function pointer to the log callback function to use.
106 * @param cb_data Pointer to private data to be passed on. This can be used
107 * by the caller to pass arbitrary data to the log functions.
108 * This pointer is only stored or passed on by libsigrokdecode,
109 * and is never used or interpreted in any way. The pointer
110 * is allowed to be NULL if the caller doesn't need/want to
113 * @return SRD_OK upon success, SRD_ERR_ARG upon invalid arguments.
117 SRD_API int srd_log_callback_set(srd_log_callback cb, void *cb_data)
120 srd_err("log: %s: cb was NULL", __func__);
124 /* Note: 'cb_data' is allowed to be NULL. */
127 srd_log_cb_data = cb_data;
133 * Set the libsigrokdecode log callback to the default built-in one.
135 * Additionally, the internal 'srd_log_cb_data' pointer is set to NULL.
137 * @return SRD_OK upon success, a (negative) error code otherwise.
141 SRD_API int srd_log_callback_set_default(void)
144 * Note: No log output in this function, as it should safely work
145 * even if the currently set log callback is buggy/broken.
147 srd_log_cb = srd_logv;
148 srd_log_cb_data = NULL;
153 static int srd_logv(void *cb_data, int loglevel, const char *format,
156 /* This specific log callback doesn't need the void pointer data. */
159 /* Only output messages of at least the selected loglevel(s). */
160 if (loglevel > cur_loglevel)
163 if (fputs("srd: ", stderr) < 0
164 || g_vfprintf(stderr, format, args) < 0
165 || putc('\n', stderr) < 0)
172 SRD_PRIV int srd_log(int loglevel, const char *format, ...)
177 va_start(args, format);
178 ret = srd_log_cb(srd_log_cb_data, loglevel, format, args);