util.h

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#ifndef UTIL_H
#define UTIL_H
 
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#define QUOTE(name) #name
#define STR(macro) QUOTE(macro)
 
#define CAT(x, y) CAT_(x, y)
#define CAT_(x, y) x##y
 
#define buffer_size(format, ...) (snprintf(NULL, 0, (format), __VA_ARGS__) + 1) // safe byte for \0
 
#define streq(x, y) (strcmp((x), (y)) == 0)
 
#define strneq(x, y, n) (strncmp((x), (y), (n)) == 0)
 
#define MAX(a, b) ((a) > (b) ? (a) : (b))
 
#define MIN(a, b) ((a) < (b) ? (a) : (b))
 
#define COALESCE(a, b) ((a == NULL) ? (b) : (a))
 
#define errno_exit(of)      \
    do {                    \
        perror(of);         \
        exit(EXIT_FAILURE); \
    } while (0)
 
#define array_len(array) (sizeof(array) / sizeof((array)[0]))
 
#ifdef __clang__
#define ATTR_FLAG_ENUM [[clang::flag_enum]]
#else
#define ATTR_FLAG_ENUM
#endif // __clang__
 
#ifdef __GNUC__
#define ATTR_FORMAT(archetype, string_index, first_to_check) __attribute__((format(archetype, string_index, first_to_check)))
#else
#define ATTR_FORMAT(archetype, string_index, first_to_check)
#endif // __GNUC__
 
char *strfmt(const char *fmt, ...) ATTR_FORMAT(printf, 1, 2);
 
char *vstrfmt(const char *fmt, va_list ap);
 
char *fslurp(FILE *fp);
 
#if __STDC_VERSION__ < 202000L
#define unreachable() abort()
#else
#include <stddef.h>
#endif
 
#endif // UTIL_H