Little program to print the flags set on a file by name on macOS.

flag_names.awk

BEGIN {
	print "#include <sys/stat.h>\n"
	print "struct { unsigned flag; const char* name; } flag_names[] = {"
}

/^#define [SU]F_/ && !/[SU]F_SETTABLE/ {
	print "\t" $2 ", \"" tolower(substr($2,4)) "\","
}

END {
	print "\t0, 0"
	print "};"
}

getflags.c

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

#include "flag_names.h"

int main(int argc, char** argv) {
	struct stat file_stat;
	int nth = 0;

	if (argc < 2 || argc > 3) {
		fprintf(stderr, "Usage: %s [-l] <filename>\n", argv[0]);
		fprintf(stderr, "  -l  If filename is a symlink, print info about the link itself\n");
		return 1;
	}

	if (strncmp(argv[1], "-l", 2) == 0) {
		lstat(argv[2], &file_stat);
	} else {
		stat(argv[1], &file_stat);
	}

	if (errno != 0) {
		perror(argv[1]);
		return errno;
	}

	for (int i = 0; flag_names[i].flag != 0; i++) {
		if (file_stat.st_flags & flag_names[i].flag) {
			if (nth != 0) {
				printf(", ");
			}
			printf("%s", flag_names[i].name);

			nth++;
		}
	}

	if (nth > 0) {
		putchar('\n');
	}
}

Makefile

OUT := getflags
SDK := $(shell xcrun --show-sdk-path)

all: $(OUT)

clean:
	rm flag_names.h $(OUT)

flag_names.h: flag_names.awk
	awk -f $< "$(SDK)/usr/include/sys/stat.h" > $@

$(OUT): getflags.c flag_names.h
	$(CC) -o $(OUT) getflags.c