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#include <string.h>
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void dbg_set_log(FILE *log_file);
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FILE *dbg_get_log();
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void fprintf_with_timestamp(FILE *log_file, const char *format, ...);
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#define debug(M, ...)
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#define debug(M, ...) fprintf(dbg_get_log(), "DEBUG %s:%d: " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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#define debug(M, ...) fprintf_with_timestamp(dbg_get_log(), "DEBUG %s:%d: " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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// versions that don't feature line numbers
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#define log_err(M, ...) fprintf(dbg_get_log(), "[ERROR] (errno: %s) " M "\n", clean_errno(), ##__VA_ARGS__)
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#define log_warn(M, ...) fprintf(dbg_get_log(), "[WARN] (errno: %s) " M "\n", clean_errno(), ##__VA_ARGS__)
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#define log_info(M, ...) fprintf(dbg_get_log(), "[INFO] " M "\n", ##__VA_ARGS__)
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#define log_err(M, ...) fprintf_with_timestamp(dbg_get_log(), "[ERROR] (errno: %s) " M "\n", clean_errno(), ##__VA_ARGS__)
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#define log_warn(M, ...) fprintf_with_timestamp(dbg_get_log(), "[WARN] (errno: %s) " M "\n", clean_errno(), ##__VA_ARGS__)
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#define log_info(M, ...) fprintf_with_timestamp(dbg_get_log(), "[INFO] " M "\n", ##__VA_ARGS__)
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#define log_err(M, ...) fprintf(dbg_get_log(), "[ERROR] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
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#define log_warn(M, ...) fprintf(dbg_get_log(), "[WARN] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
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#define log_info(M, ...) fprintf(dbg_get_log(), "[INFO] (%s:%d) " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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#define log_err(M, ...) fprintf_with_timestamp(dbg_get_log(), "[ERROR] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
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#define log_warn(M, ...) fprintf_with_timestamp(dbg_get_log(), "[WARN] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
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#define log_info(M, ...) fprintf_with_timestamp(dbg_get_log(), "[INFO] (%s:%d) " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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#define check(A, M, ...) if(!(A)) { log_err(M, ##__VA_ARGS__); errno=0; goto error; }