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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include <stdarg.h> | |
22 | #include <stdio.h> | |
23 | #include <libsigrok/libsigrok.h> | |
24 | /** @cond PRIVATE */ | |
25 | #define NO_LOG_WRAPPERS | |
26 | /** @endcond */ | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | /** | |
30 | * @file | |
31 | * | |
32 | * Controlling the libsigrok message logging functionality. | |
33 | */ | |
34 | ||
35 | /** | |
36 | * @defgroup grp_logging Logging | |
37 | * | |
38 | * Controlling the libsigrok message logging functionality. | |
39 | * | |
40 | * @{ | |
41 | */ | |
42 | ||
43 | /* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */ | |
44 | static int cur_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */ | |
45 | ||
46 | /* Function prototype. */ | |
47 | static int sr_logv(void *cb_data, int loglevel, const char *format, | |
48 | va_list args); | |
49 | ||
50 | /* Pointer to the currently selected log callback. Default: sr_logv(). */ | |
51 | static sr_log_callback sr_log_cb = sr_logv; | |
52 | ||
53 | /* | |
54 | * Pointer to private data that can be passed to the log callback. | |
55 | * This can be used (for example) by C++ GUIs to pass a "this" pointer. | |
56 | */ | |
57 | static void *sr_log_cb_data = NULL; | |
58 | ||
59 | /* Log domain (a short string that is used as prefix for all messages). */ | |
60 | /** @cond PRIVATE */ | |
61 | #define LOGDOMAIN_MAXLEN 30 | |
62 | #define LOGDOMAIN_DEFAULT "sr: " | |
63 | /** @endcond */ | |
64 | static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT; | |
65 | ||
66 | static int64_t sr_log_start_time = 0; | |
67 | ||
68 | /** | |
69 | * Set the libsigrok loglevel. | |
70 | * | |
71 | * This influences the amount of log messages (debug messages, error messages, | |
72 | * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages. | |
73 | * | |
74 | * Note that this function itself will also output log messages. After the | |
75 | * loglevel has changed, it will output a debug message with SR_LOG_DBG for | |
76 | * example. Whether this message is shown depends on the (new) loglevel. | |
77 | * | |
78 | * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN, | |
79 | * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW). | |
80 | * | |
81 | * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel. | |
82 | * | |
83 | * @since 0.1.0 | |
84 | */ | |
85 | SR_API int sr_log_loglevel_set(int loglevel) | |
86 | { | |
87 | if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) { | |
88 | sr_err("Invalid loglevel %d.", loglevel); | |
89 | return SR_ERR_ARG; | |
90 | } | |
91 | /* Output time stamps relative to time at startup */ | |
92 | if (loglevel >= SR_LOG_SPEW && sr_log_start_time == 0) | |
93 | sr_log_start_time = g_get_monotonic_time(); | |
94 | ||
95 | cur_loglevel = loglevel; | |
96 | ||
97 | sr_dbg("libsigrok loglevel set to %d.", loglevel); | |
98 | ||
99 | return SR_OK; | |
100 | } | |
101 | ||
102 | /** | |
103 | * Get the libsigrok loglevel. | |
104 | * | |
105 | * @return The currently configured libsigrok loglevel. | |
106 | * | |
107 | * @since 0.1.0 | |
108 | */ | |
109 | SR_API int sr_log_loglevel_get(void) | |
110 | { | |
111 | return cur_loglevel; | |
112 | } | |
113 | ||
114 | /** | |
115 | * Set the libsigrok logdomain string. | |
116 | * | |
117 | * @param logdomain The string to use as logdomain for libsigrok log | |
118 | * messages from now on. Must not be NULL. The maximum | |
119 | * length of the string is 30 characters (this does not | |
120 | * include the trailing NUL-byte). Longer strings are | |
121 | * silently truncated. | |
122 | * In order to not use a logdomain, pass an empty string. | |
123 | * The function makes its own copy of the input string, i.e. | |
124 | * the caller does not need to keep it around. | |
125 | * | |
126 | * @return SR_OK upon success, SR_ERR_ARG upon invalid logdomain. | |
127 | * | |
128 | * @since 0.1.0 | |
129 | */ | |
130 | SR_API int sr_log_logdomain_set(const char *logdomain) | |
131 | { | |
132 | if (!logdomain) { | |
133 | sr_err("log: %s: logdomain was NULL", __func__); | |
134 | return SR_ERR_ARG; | |
135 | } | |
136 | ||
137 | /* TODO: Error handling. */ | |
138 | snprintf(sr_log_domain, LOGDOMAIN_MAXLEN, "%s", logdomain); | |
139 | ||
140 | sr_dbg("Log domain set to '%s'.", sr_log_domain); | |
141 | ||
142 | return SR_OK; | |
143 | } | |
144 | ||
145 | /** | |
146 | * Get the currently configured libsigrok logdomain. | |
147 | * | |
148 | * @return A copy of the currently configured libsigrok logdomain | |
149 | * string. The caller is responsible for g_free()ing the string when | |
150 | * it is no longer needed. | |
151 | * | |
152 | * @since 0.1.0 | |
153 | */ | |
154 | SR_API char *sr_log_logdomain_get(void) | |
155 | { | |
156 | return g_strdup(sr_log_domain); | |
157 | } | |
158 | ||
159 | /** | |
160 | * Set the libsigrok log callback to the specified function. | |
161 | * | |
162 | * @param cb Function pointer to the log callback function to use. | |
163 | * Must not be NULL. | |
164 | * @param cb_data Pointer to private data to be passed on. This can be used by | |
165 | * the caller to pass arbitrary data to the log functions. This | |
166 | * pointer is only stored or passed on by libsigrok, and is | |
167 | * never used or interpreted in any way. The pointer is allowed | |
168 | * to be NULL if the caller doesn't need/want to pass any data. | |
169 | * | |
170 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. | |
171 | * | |
172 | * @since 0.3.0 | |
173 | */ | |
174 | SR_API int sr_log_callback_set(sr_log_callback cb, void *cb_data) | |
175 | { | |
176 | if (!cb) { | |
177 | sr_err("log: %s: cb was NULL", __func__); | |
178 | return SR_ERR_ARG; | |
179 | } | |
180 | ||
181 | /* Note: 'cb_data' is allowed to be NULL. */ | |
182 | ||
183 | sr_log_cb = cb; | |
184 | sr_log_cb_data = cb_data; | |
185 | ||
186 | return SR_OK; | |
187 | } | |
188 | ||
189 | /** | |
190 | * Set the libsigrok log callback to the default built-in one. | |
191 | * | |
192 | * Additionally, the internal 'sr_log_cb_data' pointer is set to NULL. | |
193 | * | |
194 | * @return SR_OK upon success, a negative error code otherwise. | |
195 | * | |
196 | * @since 0.1.0 | |
197 | */ | |
198 | SR_API int sr_log_callback_set_default(void) | |
199 | { | |
200 | /* | |
201 | * Note: No log output in this function, as it should safely work | |
202 | * even if the currently set log callback is buggy/broken. | |
203 | */ | |
204 | sr_log_cb = sr_logv; | |
205 | sr_log_cb_data = NULL; | |
206 | ||
207 | return SR_OK; | |
208 | } | |
209 | ||
210 | static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args) | |
211 | { | |
212 | int64_t elapsed; | |
213 | int64_t min; | |
214 | int sec; | |
215 | int usec; | |
216 | ||
217 | /* This specific log callback doesn't need the void pointer data. */ | |
218 | (void)cb_data; | |
219 | ||
220 | /* Only output messages of at least the selected loglevel(s). */ | |
221 | if (loglevel > cur_loglevel) | |
222 | return SR_OK; | |
223 | ||
224 | if (cur_loglevel >= SR_LOG_SPEW) { | |
225 | elapsed = g_get_monotonic_time() - sr_log_start_time; | |
226 | min = elapsed / G_TIME_SPAN_MINUTE; | |
227 | sec = (elapsed % G_TIME_SPAN_MINUTE) / G_TIME_SPAN_SECOND; | |
228 | usec = elapsed % G_TIME_SPAN_SECOND; | |
229 | ||
230 | if (fprintf(stderr, "[%.2" PRIi64 ":%.2d.%.6d] ", min, sec, usec) < 0) | |
231 | return SR_ERR; | |
232 | } | |
233 | if (sr_log_domain[0] != '\0' && fputs(sr_log_domain, stderr) < 0) | |
234 | return SR_ERR; | |
235 | if (vfprintf(stderr, format, args) < 0) | |
236 | return SR_ERR; | |
237 | if (putc('\n', stderr) < 0) | |
238 | return SR_ERR; | |
239 | ||
240 | return SR_OK; | |
241 | } | |
242 | ||
243 | /** @private */ | |
244 | SR_PRIV int sr_log(int loglevel, const char *format, ...) | |
245 | { | |
246 | int ret; | |
247 | va_list args; | |
248 | ||
249 | va_start(args, format); | |
250 | ret = sr_log_cb(sr_log_cb_data, loglevel, format, args); | |
251 | va_end(args); | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
256 | /** @private */ | |
257 | SR_PRIV int sr_spew(const char *format, ...) | |
258 | { | |
259 | int ret; | |
260 | va_list args; | |
261 | ||
262 | va_start(args, format); | |
263 | ret = sr_log_cb(sr_log_cb_data, SR_LOG_SPEW, format, args); | |
264 | va_end(args); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | /** @private */ | |
270 | SR_PRIV int sr_dbg(const char *format, ...) | |
271 | { | |
272 | int ret; | |
273 | va_list args; | |
274 | ||
275 | va_start(args, format); | |
276 | ret = sr_log_cb(sr_log_cb_data, SR_LOG_DBG, format, args); | |
277 | va_end(args); | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | /** @private */ | |
283 | SR_PRIV int sr_info(const char *format, ...) | |
284 | { | |
285 | int ret; | |
286 | va_list args; | |
287 | ||
288 | va_start(args, format); | |
289 | ret = sr_log_cb(sr_log_cb_data, SR_LOG_INFO, format, args); | |
290 | va_end(args); | |
291 | ||
292 | return ret; | |
293 | } | |
294 | ||
295 | /** @private */ | |
296 | SR_PRIV int sr_warn(const char *format, ...) | |
297 | { | |
298 | int ret; | |
299 | va_list args; | |
300 | ||
301 | va_start(args, format); | |
302 | ret = sr_log_cb(sr_log_cb_data, SR_LOG_WARN, format, args); | |
303 | va_end(args); | |
304 | ||
305 | return ret; | |
306 | } | |
307 | ||
308 | /** @private */ | |
309 | SR_PRIV int sr_err(const char *format, ...) | |
310 | { | |
311 | int ret; | |
312 | va_list args; | |
313 | ||
314 | va_start(args, format); | |
315 | ret = sr_log_cb(sr_log_cb_data, SR_LOG_ERR, format, args); | |
316 | va_end(args); | |
317 | ||
318 | return ret; | |
319 | } | |
320 | ||
321 | /** @} */ |