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| -rw-r--r-- | lv2/lv2plug.in/ns/ext/log/logger.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/lv2/lv2plug.in/ns/ext/log/logger.h b/lv2/lv2plug.in/ns/ext/log/logger.h new file mode 100644 index 0000000..f7cd921 --- /dev/null +++ b/lv2/lv2plug.in/ns/ext/log/logger.h @@ -0,0 +1,145 @@ +/* + Copyright 2012 David Robillard <http://drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +/** + @file logger.h Convenience API for easy logging in plugin code. + + This file provides simple wrappers for the most common log operations for + use in plugin implementations. If host support for logging is not + available, then these functions will print to stderr instead. + + This header is non-normative, it is provided for convenience. +*/ + +#ifndef LV2_ATOM_LOGGER_H +#define LV2_ATOM_LOGGER_H + +#include <stdio.h> + +#include "lv2/lv2plug.in/ns/ext/log/log.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + Logger convenience API state. +*/ +typedef struct { + LV2_Log_Log* log; + + LV2_URID Error; + LV2_URID Note; + LV2_URID Trace; + LV2_URID Warning; +} LV2_Log_Logger; + +/** + Initialise @p logger. + + URIs will be mapped using @p map and stored, a reference to @p map itself is + not held. Both @p map and @p log may be NULL when unsupported by the host, + in which case the implementation will fall back to printing to stderr. +*/ +static inline void +lv2_log_logger_init(LV2_Log_Logger* logger, + LV2_URID_Map* map, + LV2_Log_Log* log) +{ + memset(logger, 0, sizeof(LV2_Log_Logger)); + logger->log = log; + if (map) { + logger->Error = map->map(map->handle, LV2_LOG__Error); + logger->Note = map->map(map->handle, LV2_LOG__Note); + logger->Trace = map->map(map->handle, LV2_LOG__Trace); + logger->Warning = map->map(map->handle, LV2_LOG__Warning); + } +} + +/** + Log a message to the host, or stderr if support is unavailable. +*/ +LV2_LOG_FUNC(3, 0) +static inline int +lv2_log_vprintf(LV2_Log_Logger* logger, + LV2_URID type, + const char* fmt, + va_list args) +{ + if (logger->log) { + return logger->log->vprintf(logger->log->handle, type, fmt, args); + } else { + return vfprintf(stderr, fmt, args); + } +} + +/** Log an error via lv2_log_vprintf(). */ +LV2_LOG_FUNC(2, 3) +static inline int +lv2_log_error(LV2_Log_Logger* logger, const char* fmt, ...) +{ + va_list args; + va_start(args, fmt); + const int ret = lv2_log_vprintf(logger, logger->Error, fmt, args); + va_end(args); + return ret; +} + +/** Log a note via lv2_log_vprintf(). */ +LV2_LOG_FUNC(2, 3) +static inline int +lv2_log_note(LV2_Log_Logger* logger, const char* fmt, ...) +{ + va_list args; + va_start(args, fmt); + const int ret = lv2_log_vprintf(logger, logger->Note, fmt, args); + va_end(args); + return ret; +} + +/** Log a trace via lv2_log_vprintf(). */ +LV2_LOG_FUNC(2, 3) +static inline int +lv2_log_trace(LV2_Log_Logger* logger, const char* fmt, ...) +{ + va_list args; + va_start(args, fmt); + const int ret = lv2_log_vprintf(logger, logger->Trace, fmt, args); + va_end(args); + return ret; +} + +/** Log a warning via lv2_log_vprintf(). */ +LV2_LOG_FUNC(2, 3) +static inline int +lv2_log_warning(LV2_Log_Logger* logger, const char* fmt, ...) +{ + va_list args; + va_start(args, fmt); + const int ret = lv2_log_vprintf(logger, logger->Warning, fmt, args); + va_end(args); + return ret; +} + +/** + @} +*/ + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* LV2_LOG_LOGGER_H */ |