io.h

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#pragma once
 
#include <stdio.h>
#include <stdbool.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
  int saved_stdout_fd; 
  int saved_stderr_fd; 
  FILE *output;        
} log_io_t;

log_io_t log_io_start(void);

void log_io_stop(log_io_t capture, const char *prefix);

#define LOG_IO_IF(condition, prefix, block)                                                                            \
  do {                                                                                                                 \
    bool _log_io_enabled = (condition);                                                                                \
    log_io_t _log_io = {0};                                                                                            \
    if (_log_io_enabled)                                                                                               \
      _log_io = log_io_start();                                                                                        \
    block;                                                                                                             \
    if (_log_io_enabled)                                                                                               \
      log_io_stop(_log_io, (prefix));                                                                                  \
  } while (0)
 
#define LOG_IO(prefix, block) LOG_IO_IF(true, prefix, block)
 
#ifdef __cplusplus
}
#endif