ls -R 例程

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>


#define MAX_PATH 1024

void dirwalk(char *dir,void (*fcn)(char *))
{

	char name[MAX_PATH];
	struct dirent *dp;
	DIR *dfd;

	if ((dfd = opendir(dir)) == NULL){
		fprintf(stderr,"dirwalk: can't open %s\n",dir);
		return ;
	}

	while ((dp = readdir(dfd)) != NULL){
		if ((strcmp(dp->d_name,".") == 0) || strcmp(dp->d_name,"..") == 0)
			continue;
		if (strlen(dir)+strlen(dp->d_name)+2 > sizeof(name))
			fprintf(stderr,"dirwalk : name %s %s too long\n",dir,dp->d_name);
		else {
			sprintf(name, "%s/%s",dir,dp->d_name);
			(*fcn)(name);
		}
	}
	closedir(dfd);
}


void fsize(char *name)
{

	struct stat stbuf;

	if(stat(name, &stbuf) == -1){
	
		fprintf(stderr, "fsize: can't access %s\n",name);
		return;
	}

	if ((stbuf.st_mode& S_IFMT) == S_IFDIR){
		dirwalk(name,fsize);

	}

	printf("%8ld %s\n",stbuf.st_size,name);
}


int main(int argc, char **argv)
{
	if (argc == 1){
		fsize(".");
	}
	else{
		while (--argc > 0){
			fsize(*++argv);
		}
	}
	return 0;
}