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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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <stdarg.h> | |
22 | #include <stdio.h> | |
23 | #include <glib/gprintf.h> | |
24 | #include <libsigrok/libsigrok.h> | |
25 | #include "libsigrok-internal.h" | |
26 | ||
27 | #define LOG_PREFIX "log" | |
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 | /** @cond PRIVATE */ | |
60 | #define LOGLEVEL_TIMESTAMP SR_LOG_DBG | |
61 | /** @endcond */ | |
62 | static int64_t sr_log_start_time = 0; | |
63 | ||
64 | /** | |
65 | * Set the libsigrok loglevel. | |
66 | * | |
67 | * This influences the amount of log messages (debug messages, error messages, | |
68 | * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages. | |
69 | * | |
70 | * Note that this function itself will also output log messages. After the | |
71 | * loglevel has changed, it will output a debug message with SR_LOG_DBG for | |
72 | * example. Whether this message is shown depends on the (new) loglevel. | |
73 | * | |
74 | * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN, | |
75 | * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW). | |
76 | * | |
77 | * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel. | |
78 | * | |
79 | * @since 0.1.0 | |
80 | */ | |
81 | SR_API int sr_log_loglevel_set(int loglevel) | |
82 | { | |
83 | if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) { | |
84 | sr_err("Invalid loglevel %d.", loglevel); | |
85 | return SR_ERR_ARG; | |
86 | } | |
87 | /* Output time stamps relative to time at startup */ | |
88 | if (loglevel >= LOGLEVEL_TIMESTAMP && sr_log_start_time == 0) | |
89 | sr_log_start_time = g_get_monotonic_time(); | |
90 | ||
91 | cur_loglevel = loglevel; | |
92 | ||
93 | sr_dbg("libsigrok loglevel set to %d.", loglevel); | |
94 | ||
95 | return SR_OK; | |
96 | } | |
97 | ||
98 | /** | |
99 | * Get the libsigrok loglevel. | |
100 | * | |
101 | * @return The currently configured libsigrok loglevel. | |
102 | * | |
103 | * @since 0.1.0 | |
104 | */ | |
105 | SR_API int sr_log_loglevel_get(void) | |
106 | { | |
107 | return cur_loglevel; | |
108 | } | |
109 | ||
110 | /** | |
111 | * Set the libsigrok log callback to the specified function. | |
112 | * | |
113 | * @param cb Function pointer to the log callback function to use. | |
114 | * Must not be NULL. | |
115 | * @param cb_data Pointer to private data to be passed on. This can be used by | |
116 | * the caller to pass arbitrary data to the log functions. This | |
117 | * pointer is only stored or passed on by libsigrok, and is | |
118 | * never used or interpreted in any way. The pointer is allowed | |
119 | * to be NULL if the caller doesn't need/want to pass any data. | |
120 | * | |
121 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. | |
122 | * | |
123 | * @since 0.3.0 | |
124 | */ | |
125 | SR_API int sr_log_callback_set(sr_log_callback cb, void *cb_data) | |
126 | { | |
127 | if (!cb) { | |
128 | sr_err("%s: cb was NULL", __func__); | |
129 | return SR_ERR_ARG; | |
130 | } | |
131 | ||
132 | /* Note: 'cb_data' is allowed to be NULL. */ | |
133 | ||
134 | sr_log_cb = cb; | |
135 | sr_log_cb_data = cb_data; | |
136 | ||
137 | return SR_OK; | |
138 | } | |
139 | ||
140 | /** | |
141 | * Set the libsigrok log callback to the default built-in one. | |
142 | * | |
143 | * Additionally, the internal 'sr_log_cb_data' pointer is set to NULL. | |
144 | * | |
145 | * @return SR_OK upon success, a negative error code otherwise. | |
146 | * | |
147 | * @since 0.1.0 | |
148 | */ | |
149 | SR_API int sr_log_callback_set_default(void) | |
150 | { | |
151 | /* | |
152 | * Note: No log output in this function, as it should safely work | |
153 | * even if the currently set log callback is buggy/broken. | |
154 | */ | |
155 | sr_log_cb = sr_logv; | |
156 | sr_log_cb_data = NULL; | |
157 | ||
158 | return SR_OK; | |
159 | } | |
160 | ||
161 | static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args) | |
162 | { | |
163 | uint64_t elapsed_us, minutes; | |
164 | unsigned int rest_us, seconds, microseconds; | |
165 | char *raw_output, *output; | |
166 | int raw_len, raw_idx, idx, ret; | |
167 | ||
168 | /* This specific log callback doesn't need the void pointer data. */ | |
169 | (void)cb_data; | |
170 | ||
171 | /* Only output messages of at least the selected loglevel(s). */ | |
172 | if (loglevel > cur_loglevel) | |
173 | return SR_OK; | |
174 | ||
175 | if (cur_loglevel >= LOGLEVEL_TIMESTAMP) { | |
176 | elapsed_us = g_get_monotonic_time() - sr_log_start_time; | |
177 | ||
178 | minutes = elapsed_us / G_TIME_SPAN_MINUTE; | |
179 | rest_us = elapsed_us % G_TIME_SPAN_MINUTE; | |
180 | seconds = rest_us / G_TIME_SPAN_SECOND; | |
181 | microseconds = rest_us % G_TIME_SPAN_SECOND; | |
182 | ||
183 | ret = g_fprintf(stderr, "sr: [%.2" PRIu64 ":%.2u.%.6u] ", | |
184 | minutes, seconds, microseconds); | |
185 | } else { | |
186 | ret = fputs("sr: ", stderr); | |
187 | } | |
188 | ||
189 | if (ret < 0 || (raw_len = g_vasprintf(&raw_output, format, args)) < 0) | |
190 | return SR_ERR; | |
191 | ||
192 | output = g_malloc0(raw_len + 1); | |
193 | ||
194 | /* Copy the string without any unwanted newlines. */ | |
195 | raw_idx = idx = 0; | |
196 | while (raw_idx < raw_len) { | |
197 | if (raw_output[raw_idx] != '\n') { | |
198 | output[idx] = raw_output[raw_idx]; | |
199 | idx++; | |
200 | } | |
201 | raw_idx++; | |
202 | } | |
203 | ||
204 | g_fprintf(stderr, "%s\n", output); | |
205 | g_free(raw_output); | |
206 | g_free(output); | |
207 | ||
208 | return SR_OK; | |
209 | } | |
210 | ||
211 | /** @private */ | |
212 | SR_PRIV int sr_log(int loglevel, const char *format, ...) | |
213 | { | |
214 | int ret; | |
215 | va_list args; | |
216 | ||
217 | va_start(args, format); | |
218 | ret = sr_log_cb(sr_log_cb_data, loglevel, format, args); | |
219 | va_end(args); | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | /** @} */ |