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b08024a8 | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
b08024a8 | 3 | * |
0ae67ff7 | 4 | * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de> |
b08024a8 UH |
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> | |
c1aae900 | 23 | #include <libsigrok/libsigrok.h> |
45c59c8b | 24 | #include "libsigrok-internal.h" |
b08024a8 | 25 | |
be92d5b4 DE |
26 | #define LOG_PREFIX "log" |
27 | ||
b4bd7088 UH |
28 | /** |
29 | * @file | |
30 | * | |
393fb9cb | 31 | * Controlling the libsigrok message logging functionality. |
b4bd7088 UH |
32 | */ |
33 | ||
7b870c38 UH |
34 | /** |
35 | * @defgroup grp_logging Logging | |
36 | * | |
37 | * Controlling the libsigrok message logging functionality. | |
38 | * | |
39 | * @{ | |
40 | */ | |
41 | ||
0ae67ff7 | 42 | /* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */ |
f897acae | 43 | static int cur_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */ |
1352eedd | 44 | |
0ae67ff7 | 45 | /* Function prototype. */ |
1f9813eb UH |
46 | static int sr_logv(void *cb_data, int loglevel, const char *format, |
47 | va_list args); | |
0ae67ff7 | 48 | |
b5118d6c | 49 | /* Pointer to the currently selected log callback. Default: sr_logv(). */ |
144f6660 | 50 | static sr_log_callback sr_log_cb = sr_logv; |
0ae67ff7 UH |
51 | |
52 | /* | |
b5118d6c | 53 | * Pointer to private data that can be passed to the log callback. |
0ae67ff7 UH |
54 | * This can be used (for example) by C++ GUIs to pass a "this" pointer. |
55 | */ | |
144f6660 | 56 | static void *sr_log_cb_data = NULL; |
0ae67ff7 UH |
57 | |
58 | /* Log domain (a short string that is used as prefix for all messages). */ | |
b4bd7088 | 59 | /** @cond PRIVATE */ |
0ae67ff7 UH |
60 | #define LOGDOMAIN_MAXLEN 30 |
61 | #define LOGDOMAIN_DEFAULT "sr: " | |
b4bd7088 | 62 | /** @endcond */ |
0ae67ff7 UH |
63 | static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT; |
64 | ||
15408b51 DE |
65 | static int64_t sr_log_start_time = 0; |
66 | ||
1352eedd UH |
67 | /** |
68 | * Set the libsigrok loglevel. | |
69 | * | |
70 | * This influences the amount of log messages (debug messages, error messages, | |
71 | * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages. | |
72 | * | |
0ae67ff7 UH |
73 | * Note that this function itself will also output log messages. After the |
74 | * loglevel has changed, it will output a debug message with SR_LOG_DBG for | |
75 | * example. Whether this message is shown depends on the (new) loglevel. | |
76 | * | |
1352eedd | 77 | * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN, |
06dd80d4 | 78 | * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW). |
44dae539 | 79 | * |
1352eedd | 80 | * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel. |
9fb5f2df UH |
81 | * |
82 | * @since 0.1.0 | |
1352eedd | 83 | */ |
0ae67ff7 | 84 | SR_API int sr_log_loglevel_set(int loglevel) |
1352eedd | 85 | { |
06dd80d4 | 86 | if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) { |
0ae67ff7 | 87 | sr_err("Invalid loglevel %d.", loglevel); |
1352eedd UH |
88 | return SR_ERR_ARG; |
89 | } | |
15408b51 DE |
90 | /* Output time stamps relative to time at startup */ |
91 | if (loglevel >= SR_LOG_SPEW && sr_log_start_time == 0) | |
92 | sr_log_start_time = g_get_monotonic_time(); | |
1352eedd | 93 | |
f897acae | 94 | cur_loglevel = loglevel; |
1352eedd | 95 | |
0ae67ff7 | 96 | sr_dbg("libsigrok loglevel set to %d.", loglevel); |
1352eedd UH |
97 | |
98 | return SR_OK; | |
99 | } | |
100 | ||
101 | /** | |
102 | * Get the libsigrok loglevel. | |
103 | * | |
104 | * @return The currently configured libsigrok loglevel. | |
9fb5f2df UH |
105 | * |
106 | * @since 0.1.0 | |
1352eedd | 107 | */ |
0ae67ff7 | 108 | SR_API int sr_log_loglevel_get(void) |
1352eedd | 109 | { |
f897acae | 110 | return cur_loglevel; |
1352eedd UH |
111 | } |
112 | ||
0ae67ff7 UH |
113 | /** |
114 | * Set the libsigrok logdomain string. | |
115 | * | |
116 | * @param logdomain The string to use as logdomain for libsigrok log | |
117 | * messages from now on. Must not be NULL. The maximum | |
118 | * length of the string is 30 characters (this does not | |
119 | * include the trailing NUL-byte). Longer strings are | |
be92d5b4 | 120 | * truncated. |
0ae67ff7 UH |
121 | * In order to not use a logdomain, pass an empty string. |
122 | * The function makes its own copy of the input string, i.e. | |
123 | * the caller does not need to keep it around. | |
44dae539 | 124 | * |
be92d5b4 DE |
125 | * @retval SR_OK upon success. |
126 | * @retval SR_ERR_ARG @a logdomain was NULL. | |
127 | * @retval SR_ERR @a logdomain was truncated. | |
9fb5f2df UH |
128 | * |
129 | * @since 0.1.0 | |
0ae67ff7 UH |
130 | */ |
131 | SR_API int sr_log_logdomain_set(const char *logdomain) | |
132 | { | |
be92d5b4 DE |
133 | size_t len; |
134 | ||
0ae67ff7 | 135 | if (!logdomain) { |
be92d5b4 | 136 | sr_err("%s: logdomain was NULL", __func__); |
0ae67ff7 UH |
137 | return SR_ERR_ARG; |
138 | } | |
139 | ||
be92d5b4 | 140 | len = g_strlcpy(sr_log_domain, logdomain, sizeof sr_log_domain); |
0ae67ff7 | 141 | |
15408b51 | 142 | sr_dbg("Log domain set to '%s'.", sr_log_domain); |
0ae67ff7 | 143 | |
be92d5b4 | 144 | return (len < sizeof sr_log_domain) ? SR_OK : SR_ERR; |
0ae67ff7 UH |
145 | } |
146 | ||
147 | /** | |
148 | * Get the currently configured libsigrok logdomain. | |
149 | * | |
150 | * @return A copy of the currently configured libsigrok logdomain | |
151 | * string. The caller is responsible for g_free()ing the string when | |
152 | * it is no longer needed. | |
9fb5f2df UH |
153 | * |
154 | * @since 0.1.0 | |
0ae67ff7 UH |
155 | */ |
156 | SR_API char *sr_log_logdomain_get(void) | |
157 | { | |
15408b51 | 158 | return g_strdup(sr_log_domain); |
0ae67ff7 UH |
159 | } |
160 | ||
161 | /** | |
b5118d6c | 162 | * Set the libsigrok log callback to the specified function. |
0ae67ff7 | 163 | * |
b5118d6c UH |
164 | * @param cb Function pointer to the log callback function to use. |
165 | * Must not be NULL. | |
1f9813eb UH |
166 | * @param cb_data Pointer to private data to be passed on. This can be used by |
167 | * the caller to pass arbitrary data to the log functions. This | |
168 | * pointer is only stored or passed on by libsigrok, and is | |
169 | * never used or interpreted in any way. The pointer is allowed | |
170 | * to be NULL if the caller doesn't need/want to pass any data. | |
44dae539 | 171 | * |
0ae67ff7 | 172 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. |
9fb5f2df | 173 | * |
47117241 | 174 | * @since 0.3.0 |
0ae67ff7 | 175 | */ |
144f6660 | 176 | SR_API int sr_log_callback_set(sr_log_callback cb, void *cb_data) |
0ae67ff7 | 177 | { |
b5118d6c | 178 | if (!cb) { |
be92d5b4 | 179 | sr_err("%s: cb was NULL", __func__); |
0ae67ff7 UH |
180 | return SR_ERR_ARG; |
181 | } | |
182 | ||
1f9813eb | 183 | /* Note: 'cb_data' is allowed to be NULL. */ |
0ae67ff7 | 184 | |
144f6660 UH |
185 | sr_log_cb = cb; |
186 | sr_log_cb_data = cb_data; | |
0ae67ff7 UH |
187 | |
188 | return SR_OK; | |
189 | } | |
190 | ||
191 | /** | |
b5118d6c | 192 | * Set the libsigrok log callback to the default built-in one. |
0ae67ff7 | 193 | * |
144f6660 | 194 | * Additionally, the internal 'sr_log_cb_data' pointer is set to NULL. |
0ae67ff7 UH |
195 | * |
196 | * @return SR_OK upon success, a negative error code otherwise. | |
9fb5f2df UH |
197 | * |
198 | * @since 0.1.0 | |
0ae67ff7 | 199 | */ |
b5118d6c | 200 | SR_API int sr_log_callback_set_default(void) |
0ae67ff7 UH |
201 | { |
202 | /* | |
203 | * Note: No log output in this function, as it should safely work | |
b5118d6c | 204 | * even if the currently set log callback is buggy/broken. |
0ae67ff7 | 205 | */ |
144f6660 UH |
206 | sr_log_cb = sr_logv; |
207 | sr_log_cb_data = NULL; | |
0ae67ff7 UH |
208 | |
209 | return SR_OK; | |
210 | } | |
211 | ||
1f9813eb | 212 | static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args) |
b08024a8 | 213 | { |
15408b51 DE |
214 | int64_t elapsed; |
215 | int64_t min; | |
216 | int sec; | |
217 | int usec; | |
b08024a8 | 218 | |
b5118d6c | 219 | /* This specific log callback doesn't need the void pointer data. */ |
1f9813eb | 220 | (void)cb_data; |
0ae67ff7 | 221 | |
1352eedd | 222 | /* Only output messages of at least the selected loglevel(s). */ |
f897acae | 223 | if (loglevel > cur_loglevel) |
15408b51 | 224 | return SR_OK; |
b08024a8 | 225 | |
15408b51 DE |
226 | if (cur_loglevel >= SR_LOG_SPEW) { |
227 | elapsed = g_get_monotonic_time() - sr_log_start_time; | |
228 | min = elapsed / G_TIME_SPAN_MINUTE; | |
229 | sec = (elapsed % G_TIME_SPAN_MINUTE) / G_TIME_SPAN_SECOND; | |
230 | usec = elapsed % G_TIME_SPAN_SECOND; | |
b08024a8 | 231 | |
15408b51 DE |
232 | if (fprintf(stderr, "[%.2" PRIi64 ":%.2d.%.6d] ", min, sec, usec) < 0) |
233 | return SR_ERR; | |
234 | } | |
235 | if (sr_log_domain[0] != '\0' && fputs(sr_log_domain, stderr) < 0) | |
236 | return SR_ERR; | |
237 | if (vfprintf(stderr, format, args) < 0) | |
238 | return SR_ERR; | |
239 | if (putc('\n', stderr) < 0) | |
240 | return SR_ERR; | |
241 | ||
242 | return SR_OK; | |
b08024a8 UH |
243 | } |
244 | ||
b4bd7088 | 245 | /** @private */ |
1a081ca6 | 246 | SR_PRIV int sr_log(int loglevel, const char *format, ...) |
b08024a8 UH |
247 | { |
248 | int ret; | |
249 | va_list args; | |
250 | ||
251 | va_start(args, format); | |
144f6660 | 252 | ret = sr_log_cb(sr_log_cb_data, loglevel, format, args); |
b08024a8 UH |
253 | va_end(args); |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
7b870c38 | 258 | /** @} */ |