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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/logger.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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3
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1 /*
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2 Copyright 2012-2016 David Robillard <http://drobilla.net>
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3
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4 Permission to use, copy, modify, and/or distribute this software for any
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5 purpose with or without fee is hereby granted, provided that the above
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6 copyright notice and this permission notice appear in all copies.
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7
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8 THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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9 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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10 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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11 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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12 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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13 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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14 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 /**
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18 @defgroup logger Logger
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19 @ingroup log
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20
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21 Convenience API for easy logging in plugin code. This API provides simple
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22 wrappers for logging from a plugin, which automatically fall back to
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23 printing to stderr if host support is unavailabe.
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24
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25 @{
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26 */
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27
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28 #ifndef LV2_ATOM_LOGGER_H
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29 #define LV2_ATOM_LOGGER_H
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30
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 #include "log.h"
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35
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36 #ifdef __cplusplus
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37 extern "C" {
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38 #endif
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39
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40 /**
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41 Logger convenience API state.
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42 */
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43 typedef struct {
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44 LV2_Log_Log* log;
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45
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46 LV2_URID Error;
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47 LV2_URID Note;
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48 LV2_URID Trace;
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49 LV2_URID Warning;
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50 } LV2_Log_Logger;
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51
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52 /**
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53 Set `map` as the URI map for `logger`.
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54
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55 This affects the message type URIDs (Error, Warning, etc) which are passed
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56 to the log's print functions.
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57 */
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58 static inline void
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59 lv2_log_logger_set_map(LV2_Log_Logger* logger, LV2_URID_Map* map)
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60 {
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61 if (map) {
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62 logger->Error = map->map(map->handle, LV2_LOG__Error);
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63 logger->Note = map->map(map->handle, LV2_LOG__Note);
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64 logger->Trace = map->map(map->handle, LV2_LOG__Trace);
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65 logger->Warning = map->map(map->handle, LV2_LOG__Warning);
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66 } else {
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67 logger->Error = logger->Note = logger->Trace = logger->Warning = 0;
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68 }
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69 }
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70
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71 /**
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72 Initialise `logger`.
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73
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74 URIs will be mapped using `map` and stored, a reference to `map` itself is
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75 not held. Both `map` and `log` may be NULL when unsupported by the host,
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76 in which case the implementation will fall back to printing to stderr.
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77 */
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78 static inline void
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79 lv2_log_logger_init(LV2_Log_Logger* logger,
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80 LV2_URID_Map* map,
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81 LV2_Log_Log* log)
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82 {
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83 logger->log = log;
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84 lv2_log_logger_set_map(logger, map);
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85 }
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86
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87 /**
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88 Log a message to the host, or stderr if support is unavailable.
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89 */
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90 LV2_LOG_FUNC(3, 0)
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91 static inline int
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92 lv2_log_vprintf(LV2_Log_Logger* logger,
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93 LV2_URID type,
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94 const char* fmt,
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95 va_list args)
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96 {
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97 if (logger && logger->log) {
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98 return logger->log->vprintf(logger->log->handle, type, fmt, args);
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99 } else {
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100 return vfprintf(stderr, fmt, args);
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101 }
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102 }
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103
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104 /** Log an error via lv2_log_vprintf(). */
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105 LV2_LOG_FUNC(2, 3)
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106 static inline int
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107 lv2_log_error(LV2_Log_Logger* logger, const char* fmt, ...)
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108 {
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109 va_list args;
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110 va_start(args, fmt);
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111 const int ret = lv2_log_vprintf(logger, logger->Error, fmt, args);
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112 va_end(args);
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113 return ret;
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114 }
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115
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116 /** Log a note via lv2_log_vprintf(). */
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117 LV2_LOG_FUNC(2, 3)
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118 static inline int
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119 lv2_log_note(LV2_Log_Logger* logger, const char* fmt, ...)
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120 {
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121 va_list args;
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122 va_start(args, fmt);
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123 const int ret = lv2_log_vprintf(logger, logger->Note, fmt, args);
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124 va_end(args);
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125 return ret;
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126 }
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127
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128 /** Log a trace via lv2_log_vprintf(). */
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129 LV2_LOG_FUNC(2, 3)
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130 static inline int
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131 lv2_log_trace(LV2_Log_Logger* logger, const char* fmt, ...)
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132 {
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133 va_list args;
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134 va_start(args, fmt);
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135 const int ret = lv2_log_vprintf(logger, logger->Trace, fmt, args);
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136 va_end(args);
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137 return ret;
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138 }
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139
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140 /** Log a warning via lv2_log_vprintf(). */
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141 LV2_LOG_FUNC(2, 3)
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142 static inline int
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143 lv2_log_warning(LV2_Log_Logger* logger, const char* fmt, ...)
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144 {
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145 va_list args;
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146 va_start(args, fmt);
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147 const int ret = lv2_log_vprintf(logger, logger->Warning, fmt, args);
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148 va_end(args);
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149 return ret;
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150 }
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151
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152 #ifdef __cplusplus
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153 } /* extern "C" */
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154 #endif
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155
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156 #endif /* LV2_LOG_LOGGER_H */
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157
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158 /**
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159 @}
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160 */