#ifndef _COMMON_H
#define _COMMON_H

#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

/* enums */
enum configurations_bitshift {
	C_BITSHIFT_CONFIRM = 0,
	C_BITSHIFT_CONTENTS,
	C_BITSHIFT_LINE_ENDINGS,
	C_BITSHIFT_PRINTABLE,
	C_BITSHIFT_CUSTOM_SEED
};

enum configurations {
	C_CONFIRM      = 1 << C_BITSHIFT_CONFIRM,
	C_CONTENTS     = 1 << C_BITSHIFT_CONTENTS,
	C_LINE_ENDINGS = 1 << C_BITSHIFT_LINE_ENDINGS,
	C_PRINTABLE    = 1 << C_BITSHIFT_PRINTABLE,
	C_CUSTOM_SEED  = 1 << C_BITSHIFT_CUSTOM_SEED
};

/* macros: procedures */
#define FPRINTF_MACRO(stream, ...) do {                                       \
    fflush(stdout);                                                           \
    fprintf(stream, __VA_ARGS__);                                             \
} while (0)

#define ERROR_MSG(a, b) do {                                                  \
    fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, __LINE__, (a), (b));         \
} while (0)

#define PERROR_MACRO(s) do {                                                  \
    int errnum = errno;                                                       \
    char* err_msg = strerror(errnum); /* XXX: Thread race possible */         \
    fflush(stdout);                                                           \
    ERROR_MSG((s), err_msg);                                                  \
} while (0)

#define FATAL_ERROR_PRINT(...) do {                                           \
    FPRINTF_MACRO(stderr, __VA_ARGS__);                                       \
    putc('\n', stderr);                                                       \
} while (0)

#define FATAL_ERROR(...) do {                                                 \
    FATAL_ERROR_PRINT(__VA_ARGS__);                                           \
    exit(EXIT_FAILURE);                                                       \
} while (0)

#define FATAL_ERROR_RET(...) do {                                             \
    FATAL_ERROR_PRINT(__VA_ARGS__);                                           \
    return EXIT_FAILURE;                                                      \
} while (0)

/* macros: definitions */
#ifndef SIZE_T_C
# if defined(UINT64_MAX) && SIZE_MAX == UINT64_MAX
#  define SIZE_T_C(x) UINT64_C(x)
# elif defined(UINT32_MAX) && SIZE_MAX == UINT32_MAX
#  define SIZE_T_C(x) UINT32_C(x)
# else
#  define SIZE_T_C(x) ((size_t) x)
# endif
#endif

#ifndef SIZE_MAX
# define SIZE_MAX (~SIZE_T_C(0))
#endif

#define STR_YN_YES "yes"
#define STR_YN_NO "no"

#ifdef HAVE_NO_FSEEKO_FTELLO
# define FSEEK_MACRO fseek
# define FTELL_MACRO ftell
typedef long file_offset_t;
# define FILE_OFFSET_C(x) ((x)##L)
#else
# define FSEEK_MACRO fseeko
# define FTELL_MACRO ftello
typedef off_t file_offset_t;
# define FILE_OFFSET_C(x) ((off_t) x)
#endif

#define MAX_PATH_LENGTH_PLUS_1 256

/* macros: lambdas */
#define STRINGIZE(x) #x
#define INT2STR(x) STRINGIZE(x)
#define YES_NO(x) ((x) ? STR_YN_YES : STR_YN_NO)
#define READ_CONFIG(x) (config & (x))
#define SET_CONFIG(x) config |= (x)
#define CLEAR_CONFIG(x) config &= ~(x)

#define LOOP_ACTION_CONFIG(f, x)                                              \
    f(x);                                                                     \
    continue

#endif /* _COMMON_H */