a/util.h

#ifndef _UTIL_H
#define _UTIL_H

#include <stdint.h>
#include <stddef.h>

#define __unused	   __attribute__((__unused__))
#define typeof_field(S, F) __typeof__(((S *)0)->F)

#define OR(X, Y) ((X) ? (X) : (Y))

/*
 * #define X SOMETHING
 * STR(X)
 *   => "SOMETHING"
 */
#define STRINGIFY_AUX(X) #X
#define STR(X)		 STRINGIFY_AUX(X)

#define WITH_STR(X) X, #X

#define STR_SIZE(S)   (LEN(S) - 1) /* minus null byte */
#define WITH_SSIZE(S) S, STR_SIZE(S)

#define QUOTED(S) "\"" S "\""

#define LEN(S)	    (sizeof(S) / sizeof *(S))
#define WITH_LEN(S) S, LEN(S)

#define SAFE_ASSIGN(TO, FROM) ((TO) = (__typeof__((TO)))(FROM))

/* funcs */
void	fiter_null(char *argv[], size_t size);
void	print_escaped(const char *str);
uint8_t match_ext(const char *file, const char *ext);
int	raw_dryrun_or_exec(uint8_t nl, uint8_t dry_run, char *const argv[]);
#define dryrun_or_exec(...) raw_dryrun_or_exec(!0, __VA_ARGS__)

#endif /* _UTIL_H */