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b08024a8 UH |
1 | /* |
2 | * This file is part of the sigrok project. | |
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> | |
45c59c8b BV |
23 | #include "libsigrok.h" |
24 | #include "libsigrok-internal.h" | |
b08024a8 | 25 | |
b4bd7088 UH |
26 | /** |
27 | * @file | |
28 | * | |
29 | * Logging support. | |
30 | */ | |
31 | ||
0ae67ff7 | 32 | /* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */ |
1352eedd UH |
33 | static int sr_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */ |
34 | ||
0ae67ff7 | 35 | /* Function prototype. */ |
1f9813eb UH |
36 | static int sr_logv(void *cb_data, int loglevel, const char *format, |
37 | va_list args); | |
0ae67ff7 | 38 | |
b5118d6c UH |
39 | /* Pointer to the currently selected log callback. Default: sr_logv(). */ |
40 | static sr_log_callback_t sr_log_callback = sr_logv; | |
0ae67ff7 UH |
41 | |
42 | /* | |
b5118d6c | 43 | * Pointer to private data that can be passed to the log callback. |
0ae67ff7 UH |
44 | * This can be used (for example) by C++ GUIs to pass a "this" pointer. |
45 | */ | |
b5118d6c | 46 | static void *sr_log_callback_data = NULL; |
0ae67ff7 UH |
47 | |
48 | /* Log domain (a short string that is used as prefix for all messages). */ | |
b4bd7088 | 49 | /** @cond PRIVATE */ |
0ae67ff7 UH |
50 | #define LOGDOMAIN_MAXLEN 30 |
51 | #define LOGDOMAIN_DEFAULT "sr: " | |
b4bd7088 | 52 | /** @endcond */ |
0ae67ff7 UH |
53 | static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT; |
54 | ||
1352eedd UH |
55 | /** |
56 | * Set the libsigrok loglevel. | |
57 | * | |
58 | * This influences the amount of log messages (debug messages, error messages, | |
59 | * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages. | |
60 | * | |
0ae67ff7 UH |
61 | * Note that this function itself will also output log messages. After the |
62 | * loglevel has changed, it will output a debug message with SR_LOG_DBG for | |
63 | * example. Whether this message is shown depends on the (new) loglevel. | |
64 | * | |
1352eedd | 65 | * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN, |
06dd80d4 | 66 | * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW). |
44dae539 | 67 | * |
1352eedd UH |
68 | * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel. |
69 | */ | |
0ae67ff7 | 70 | SR_API int sr_log_loglevel_set(int loglevel) |
1352eedd | 71 | { |
06dd80d4 | 72 | if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) { |
0ae67ff7 | 73 | sr_err("Invalid loglevel %d.", loglevel); |
1352eedd UH |
74 | return SR_ERR_ARG; |
75 | } | |
76 | ||
77 | sr_loglevel = loglevel; | |
78 | ||
0ae67ff7 | 79 | sr_dbg("libsigrok loglevel set to %d.", loglevel); |
1352eedd UH |
80 | |
81 | return SR_OK; | |
82 | } | |
83 | ||
84 | /** | |
85 | * Get the libsigrok loglevel. | |
86 | * | |
87 | * @return The currently configured libsigrok loglevel. | |
88 | */ | |
0ae67ff7 | 89 | SR_API int sr_log_loglevel_get(void) |
1352eedd UH |
90 | { |
91 | return sr_loglevel; | |
92 | } | |
93 | ||
0ae67ff7 UH |
94 | /** |
95 | * Set the libsigrok logdomain string. | |
96 | * | |
97 | * @param logdomain The string to use as logdomain for libsigrok log | |
98 | * messages from now on. Must not be NULL. The maximum | |
99 | * length of the string is 30 characters (this does not | |
100 | * include the trailing NUL-byte). Longer strings are | |
101 | * silently truncated. | |
102 | * In order to not use a logdomain, pass an empty string. | |
103 | * The function makes its own copy of the input string, i.e. | |
104 | * the caller does not need to keep it around. | |
44dae539 | 105 | * |
0ae67ff7 UH |
106 | * @return SR_OK upon success, SR_ERR_ARG upon invalid logdomain. |
107 | */ | |
108 | SR_API int sr_log_logdomain_set(const char *logdomain) | |
109 | { | |
110 | if (!logdomain) { | |
111 | sr_err("log: %s: logdomain was NULL", __func__); | |
112 | return SR_ERR_ARG; | |
113 | } | |
114 | ||
115 | /* TODO: Error handling. */ | |
116 | snprintf((char *)&sr_log_domain, LOGDOMAIN_MAXLEN, "%s", logdomain); | |
117 | ||
118 | sr_dbg("Log domain set to '%s'.", (const char *)&sr_log_domain); | |
119 | ||
120 | return SR_OK; | |
121 | } | |
122 | ||
123 | /** | |
124 | * Get the currently configured libsigrok logdomain. | |
125 | * | |
126 | * @return A copy of the currently configured libsigrok logdomain | |
127 | * string. The caller is responsible for g_free()ing the string when | |
128 | * it is no longer needed. | |
129 | */ | |
130 | SR_API char *sr_log_logdomain_get(void) | |
131 | { | |
132 | return g_strdup((const char *)&sr_log_domain); | |
133 | } | |
134 | ||
135 | /** | |
b5118d6c | 136 | * Set the libsigrok log callback to the specified function. |
0ae67ff7 | 137 | * |
b5118d6c UH |
138 | * @param cb Function pointer to the log callback function to use. |
139 | * Must not be NULL. | |
1f9813eb UH |
140 | * @param cb_data Pointer to private data to be passed on. This can be used by |
141 | * the caller to pass arbitrary data to the log functions. This | |
142 | * pointer is only stored or passed on by libsigrok, and is | |
143 | * never used or interpreted in any way. The pointer is allowed | |
144 | * to be NULL if the caller doesn't need/want to pass any data. | |
44dae539 | 145 | * |
0ae67ff7 UH |
146 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. |
147 | */ | |
b5118d6c | 148 | SR_API int sr_log_callback_set(sr_log_callback_t cb, void *cb_data) |
0ae67ff7 | 149 | { |
b5118d6c UH |
150 | if (!cb) { |
151 | sr_err("log: %s: cb was NULL", __func__); | |
0ae67ff7 UH |
152 | return SR_ERR_ARG; |
153 | } | |
154 | ||
1f9813eb | 155 | /* Note: 'cb_data' is allowed to be NULL. */ |
0ae67ff7 | 156 | |
b5118d6c UH |
157 | sr_log_callback = cb; |
158 | sr_log_callback_data = cb_data; | |
0ae67ff7 UH |
159 | |
160 | return SR_OK; | |
161 | } | |
162 | ||
163 | /** | |
b5118d6c | 164 | * Set the libsigrok log callback to the default built-in one. |
0ae67ff7 | 165 | * |
b5118d6c | 166 | * Additionally, the internal 'sr_log_callback_data' pointer is set to NULL. |
0ae67ff7 UH |
167 | * |
168 | * @return SR_OK upon success, a negative error code otherwise. | |
169 | */ | |
b5118d6c | 170 | SR_API int sr_log_callback_set_default(void) |
0ae67ff7 UH |
171 | { |
172 | /* | |
173 | * Note: No log output in this function, as it should safely work | |
b5118d6c | 174 | * even if the currently set log callback is buggy/broken. |
0ae67ff7 | 175 | */ |
b5118d6c UH |
176 | sr_log_callback = sr_logv; |
177 | sr_log_callback_data = NULL; | |
0ae67ff7 UH |
178 | |
179 | return SR_OK; | |
180 | } | |
181 | ||
1f9813eb | 182 | static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args) |
b08024a8 UH |
183 | { |
184 | int ret; | |
185 | ||
b5118d6c | 186 | /* This specific log callback doesn't need the void pointer data. */ |
1f9813eb | 187 | (void)cb_data; |
0ae67ff7 | 188 | |
1352eedd UH |
189 | /* Only output messages of at least the selected loglevel(s). */ |
190 | if (loglevel > sr_loglevel) | |
191 | return SR_OK; /* TODO? */ | |
b08024a8 | 192 | |
0ae67ff7 UH |
193 | if (sr_log_domain[0] != '\0') |
194 | fprintf(stderr, "%s", sr_log_domain); | |
b08024a8 UH |
195 | ret = vfprintf(stderr, format, args); |
196 | fprintf(stderr, "\n"); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
b4bd7088 | 201 | /** @private */ |
1a081ca6 | 202 | SR_PRIV int sr_log(int loglevel, const char *format, ...) |
b08024a8 UH |
203 | { |
204 | int ret; | |
205 | va_list args; | |
206 | ||
207 | va_start(args, format); | |
b5118d6c | 208 | ret = sr_log_callback(sr_log_callback_data, loglevel, format, args); |
b08024a8 UH |
209 | va_end(args); |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
b4bd7088 | 214 | /** @private */ |
1a081ca6 | 215 | SR_PRIV int sr_spew(const char *format, ...) |
06dd80d4 UH |
216 | { |
217 | int ret; | |
218 | va_list args; | |
219 | ||
220 | va_start(args, format); | |
b5118d6c | 221 | ret = sr_log_callback(sr_log_callback_data, SR_LOG_SPEW, format, args); |
06dd80d4 UH |
222 | va_end(args); |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
b4bd7088 | 227 | /** @private */ |
1a081ca6 | 228 | SR_PRIV int sr_dbg(const char *format, ...) |
b08024a8 UH |
229 | { |
230 | int ret; | |
231 | va_list args; | |
232 | ||
233 | va_start(args, format); | |
b5118d6c | 234 | ret = sr_log_callback(sr_log_callback_data, SR_LOG_DBG, format, args); |
b08024a8 UH |
235 | va_end(args); |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
b4bd7088 | 240 | /** @private */ |
1a081ca6 | 241 | SR_PRIV int sr_info(const char *format, ...) |
b08024a8 UH |
242 | { |
243 | int ret; | |
244 | va_list args; | |
245 | ||
246 | va_start(args, format); | |
b5118d6c | 247 | ret = sr_log_callback(sr_log_callback_data, SR_LOG_INFO, format, args); |
b08024a8 UH |
248 | va_end(args); |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
b4bd7088 | 253 | /** @private */ |
1a081ca6 | 254 | SR_PRIV int sr_warn(const char *format, ...) |
b08024a8 UH |
255 | { |
256 | int ret; | |
257 | va_list args; | |
258 | ||
259 | va_start(args, format); | |
b5118d6c | 260 | ret = sr_log_callback(sr_log_callback_data, SR_LOG_WARN, format, args); |
b08024a8 UH |
261 | va_end(args); |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
b4bd7088 | 266 | /** @private */ |
1a081ca6 | 267 | SR_PRIV int sr_err(const char *format, ...) |
b08024a8 UH |
268 | { |
269 | int ret; | |
270 | va_list args; | |
271 | ||
272 | va_start(args, format); | |
b5118d6c | 273 | ret = sr_log_callback(sr_log_callback_data, SR_LOG_ERR, format, args); |
b08024a8 UH |
274 | va_end(args); |
275 | ||
276 | return ret; | |
277 | } |