2 * This file is part of the sigrok 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, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "sigrok-internal.h"
26 /* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */
27 static int sr_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */
29 /* Function prototype. */
30 static int sr_logv(void *data, int loglevel, const char *format, va_list args);
32 /* Pointer to the currently selected log handler. Default: sr_logv(). */
33 static sr_log_handler_t sr_log_handler = sr_logv;
36 * Pointer to private data that can be passed to the log handler.
37 * This can be used (for example) by C++ GUIs to pass a "this" pointer.
39 static void *sr_log_handler_data = NULL;
41 /* Log domain (a short string that is used as prefix for all messages). */
42 #define LOGDOMAIN_MAXLEN 30
43 #define LOGDOMAIN_DEFAULT "sr: "
44 static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT;
47 * Set the libsigrok loglevel.
49 * This influences the amount of log messages (debug messages, error messages,
50 * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages.
52 * Note that this function itself will also output log messages. After the
53 * loglevel has changed, it will output a debug message with SR_LOG_DBG for
54 * example. Whether this message is shown depends on the (new) loglevel.
56 * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN,
57 * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW).
58 * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel.
60 SR_API int sr_log_loglevel_set(int loglevel)
62 if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) {
63 sr_err("Invalid loglevel %d.", loglevel);
67 sr_loglevel = loglevel;
69 sr_dbg("libsigrok loglevel set to %d.", loglevel);
75 * Get the libsigrok loglevel.
77 * @return The currently configured libsigrok loglevel.
79 SR_API int sr_log_loglevel_get(void)
85 * Set the libsigrok logdomain string.
87 * @param logdomain The string to use as logdomain for libsigrok log
88 * messages from now on. Must not be NULL. The maximum
89 * length of the string is 30 characters (this does not
90 * include the trailing NUL-byte). Longer strings are
92 * In order to not use a logdomain, pass an empty string.
93 * The function makes its own copy of the input string, i.e.
94 * the caller does not need to keep it around.
95 * @return SR_OK upon success, SR_ERR_ARG upon invalid logdomain.
97 SR_API int sr_log_logdomain_set(const char *logdomain)
100 sr_err("log: %s: logdomain was NULL", __func__);
104 /* TODO: Error handling. */
105 snprintf((char *)&sr_log_domain, LOGDOMAIN_MAXLEN, "%s", logdomain);
107 sr_dbg("Log domain set to '%s'.", (const char *)&sr_log_domain);
113 * Get the currently configured libsigrok logdomain.
115 * @return A copy of the currently configured libsigrok logdomain
116 * string. The caller is responsible for g_free()ing the string when
117 * it is no longer needed.
119 SR_API char *sr_log_logdomain_get(void)
121 return g_strdup((const char *)&sr_log_domain);
125 * Set the libsigrok log handler to the specified function.
127 * @param handler Function pointer to the log handler function to use.
129 * @param data Pointer to private data to be passed on. This can be used by
130 * the caller to pass arbitrary data to the log functions. This
131 * pointer is only stored or passed on by libsigrok, and
132 * is never used or interpreted in any way. The pointer is allowed
133 * to be NULL if the caller doesn't need/want to pass any data.
134 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
136 SR_API int sr_log_handler_set(sr_log_handler_t handler, void *data)
139 sr_err("log: %s: handler was NULL", __func__);
143 /* Note: 'data' is allowed to be NULL. */
145 sr_log_handler = handler;
146 sr_log_handler_data = data;
152 * Set the libsigrok log handler to the default built-in one.
154 * Additionally, the internal 'sr_log_handler_data' pointer is set to NULL.
156 * @return SR_OK upon success, a negative error code otherwise.
158 SR_API int sr_log_handler_set_default(void)
161 * Note: No log output in this function, as it should safely work
162 * even if the currently set log handler is buggy/broken.
164 sr_log_handler = sr_logv;
165 sr_log_handler_data = NULL;
170 static int sr_logv(void *data, int loglevel, const char *format, va_list args)
174 /* This specific log handler doesn't need the void pointer data. */
177 /* Only output messages of at least the selected loglevel(s). */
178 if (loglevel > sr_loglevel)
179 return SR_OK; /* TODO? */
181 if (sr_log_domain[0] != '\0')
182 fprintf(stderr, "%s", sr_log_domain);
183 ret = vfprintf(stderr, format, args);
184 fprintf(stderr, "\n");
189 SR_PRIV int sr_log(int loglevel, const char *format, ...)
194 va_start(args, format);
195 ret = sr_log_handler(sr_log_handler_data, loglevel, format, args);
201 SR_PRIV int sr_spew(const char *format, ...)
206 va_start(args, format);
207 ret = sr_log_handler(sr_log_handler_data, SR_LOG_SPEW, format, args);
213 SR_PRIV int sr_dbg(const char *format, ...)
218 va_start(args, format);
219 ret = sr_log_handler(sr_log_handler_data, SR_LOG_DBG, format, args);
225 SR_PRIV int sr_info(const char *format, ...)
230 va_start(args, format);
231 ret = sr_log_handler(sr_log_handler_data, SR_LOG_INFO, format, args);
237 SR_PRIV int sr_warn(const char *format, ...)
242 va_start(args, format);
243 ret = sr_log_handler(sr_log_handler_data, SR_LOG_WARN, format, args);
249 SR_PRIV int sr_err(const char *format, ...)
254 va_start(args, format);
255 ret = sr_log_handler(sr_log_handler_data, SR_LOG_ERR, format, args);