Created
December 28, 2021 19:49
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Barebones code for a structured logger in C
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| #pragma once | |
| // config | |
| #define LOG_USE_STDIO 1 | |
| #define LOG_USE_FILE 0 | |
| #define LOG_USE_STRUCTURED 1 | |
| #define LOG_LEVEL_TRACE 0 | |
| #define LOG_LEVEL_WARN 1 | |
| #define LOG_LEVEL_ERROR 2 | |
| #if !defined(LOG_LEVEL) | |
| # define LOG_LEVEL LOG_LEVEL_TRACE | |
| #endif | |
| // implementation | |
| #define LOG__EOL "\x20\x1A\n" | |
| #define LOG__EOM "\x1A\x1A\n" | |
| #define LOG__FLAT(file, line, level, msg) \ | |
| level " " file ":" line " |" msg "\n" | |
| #define LOG__STRUCTURED(file, line, level, msg) \ | |
| level LOG__EOL \ | |
| "\tfile: " file LOG__EOL \ | |
| "\tline: " line LOG__EOL \ | |
| "\tmsg: " msg LOG__EOM "\n" | |
| #if LOG_USE_STRUCTURED | |
| # define LOG__LINE(file, line, level, msg) \ | |
| LOG__STRUCTURED(file, line, level, msg) | |
| #else | |
| # define LOG__LINE(file, line, level, msg) \ | |
| LOG__FLAT(file, line, level, msg) | |
| #endif | |
| #if LOG_USE_STDIO | |
| # define LOG__STDIO_FPRINTF(stream, fmt, ...) \ | |
| fprintf(stream, fmt, __VA_ARGS__); | |
| #else | |
| # define LOG__STDIO_FPRINTF(stream, fmt, ...) | |
| #endif | |
| #if LOG_USE_FILE | |
| # define LOG__FILE(stream, fmt, ...) \ | |
| fprintf(stream, fmt, __VA_ARGS__); \ | |
| fflush(stream); | |
| #else | |
| # define LOG__FILE(stream, fmt, ...) | |
| #endif | |
| #define LOG__XSTR(x) #x | |
| #define LOG__STR(x) LOG__XSTR(x) | |
| #define LOG__DECL_LOGLEVELF(T, fmt, ...) \ | |
| { \ | |
| LOG__STDIO_FPRINTF(stdout, \ | |
| LOG__LINE(__FILE__, LOG__STR(__LINE__), #T, fmt), \ | |
| __VA_ARGS__); \ | |
| \ | |
| LOG__FILE(handle, \ | |
| LOG__LINE(__FILE__, LOG__STR(__LINE__), #T, fmt), \ | |
| __VA_ARGS__); \ | |
| } | |
| #if LOG_LEVEL == LOG_LEVEL_TRACE | |
| # define LOG_TRACEF(fmt, ...) LOG__DECL_LOGLEVELF("TRC", fmt, __VA_ARGS__); | |
| #else | |
| # define LOG_TRACEF(fmt, ...) | |
| #endif | |
| #if LOG_LEVEL <= LOG_LEVEL_WARN | |
| # define LOG_WARNF(fmt, ...) LOG__DECL_LOGLEVELF("WRN", fmt, __VA_ARGS__); | |
| #else | |
| # define LOG_WARNF(fmt, ...) | |
| #endif | |
| #if LOG_LEVEL <= LOG_LEVEL_ERROR | |
| # define LOG_ERRORF(fmt, ...) LOG__DECL_LOGLEVELF("ERR", fmt, __VA_ARGS__); | |
| #else | |
| # define LOG_ERRORF(fmt, ...) | |
| #endif |
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