nftw-usage.c

#define _GNU_SOURCE
#include <stdio.h>
#include <ftw.h>

int walk(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf)
{
	static const char *flag2msg[] = {
		[FTW_F] = "Regular file.",
		[FTW_D] = "Directory.",
		[FTW_DNR] = "Unreadable directory.",
		[FTW_NS] = "Unstatable file.",
		[FTW_SL] = "Symbolic link.",
		[FTW_DP] = "Directory, all subdirs have been visited.",
		[FTW_SLN] = "Symbolic link naming non-existing file.",
	};
	for (int i = 0; i < ftwbuf->level; i++) {
		fputs("  ", stdout);
	}
	if (typeflag == FTW_F) {
		printf("%s (%ldB): %s\n", fpath + ftwbuf->base, sb->st_size, flag2msg[typeflag]);
	} else {
		printf("%s: %s\n", fpath + ftwbuf->base, flag2msg[typeflag]);
	}
	return 0;
}

int main(int argc, const char *argv[])
{
	const char *root = ".";
	if (argc >= 2) {
		root = argv[1];
	}
	int ret = nftw(root, walk, 10, 0);
	printf("result: %d\n", ret);
	return 0;
}