util.h

/** \file
 * Utility functions.
 */
#ifndef _util_h_
#define _util_h_

#ifdef __cplusplus
extern "C" {
#endif


#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <errno.h>
#include <unistd.h>

#define warn(fmt, ...)                                                         \
  do {                                                                         \
    fprintf(stderr, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__);         \
  } while (0)

#define warn_once(fmt, ...)                                                    \
  do {                                                                         \
    static unsigned __warned__;                                                \
    if (__warned__)                                                            \
      break;                                                                   \
    __warned__ = 1;                                                            \
    warn(fmt, ##__VA_ARGS__);                                                  \
  } while (0)

#define die(fmt, ...)                                                          \
  do {                                                                         \
    warn(fmt, ##__VA_ARGS__);                                                  \
    exit(EXIT_FAILURE);                                                        \
  } while (0)

extern void hexdump(FILE *const outfile, const void *const buf,
                    const size_t len);

extern int serial_open(const char *const dev);

/** Write all the bytes to a fd, even if there is a brief interruption.
 * \return number of bytes written or -1 on any fatal error.
 */
extern ssize_t write_all(const int fd, const void *const buf_ptr,
                         const size_t len);

#ifdef __cplusplus
}
#endif

#endif