Linux下ls命令的简略实现
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
#include <pwd.h>
#include <grp.h>
#include <stdlib.h>
void rm(char *pathname) {
struct stat buf;
if (stat(pathname, &buf) == -1) {
printf("path not exist\n");
return;
}
if (S_ISREG(buf.st_mode)) {
unlink(pathname);
printf("remove file:%s\n", pathname);
} else if (S_ISDIR(buf.st_mode)) {
DIR *pdir = opendir(pathname);
struct dirent *pdirent = NULL;
while ((pdirent = readdir(pdir)) != NULL) {
if (strcmp(pdirent->d_name, ".") == 0 || strcmp(pdirent->d_name,
"..") == 0)
continue;
char temp[128] = { '\0' };
//strcat(temp,pathname);
//strcat(temp,"/");
//strcat(temp,pdirent->d_name);
sprintf(temp, "%s/%s", pathname, pdirent->d_name);
rm(temp);
}
rmdir(pathname);
printf("remove directory:%s\n", pathname);
closedir(pdir);
}
}
void ls_file(char *dirname, char *filename) {
char temp[128] = { '\0' };
sprintf(temp, "%s/%s", dirname, filename);
char perms[11] = "----------";
struct stat buf;
if (stat(temp, &buf) == -1) {
printf("path not exist\n");
return;
}
switch (buf.st_mode & S_IFMT) {
case S_IFREG:
perms[0] = '-';
break;
case S_IFDIR:
perms[0] = 'd';
break;
case S_IFLNK:
perms[0] = 'l';
break;
case S_IFBLK:
perms[0] = 'b';
break;
case S_IFCHR:
perms[0] = 'c';
break;
case S_IFSOCK:
perms[0] = 's';
break;
default:
break;
}
if (buf.st_mode & S_IRUSR)
perms[1] = 'r';
if (buf.st_mode & S_IWUSR)
perms[2] = 'w';
if (buf.st_mode & S_IXUSR)
perms[3] = 'x';
if (buf.st_mode & S_IRGRP)
perms[4] = 'r';
if (buf.st_mode & S_IWGRP)
perms[5] = 'w';
if (buf.st_mode & S_IXGRP)
perms[6] = 'x';
if (buf.st_mode & S_IROTH)
perms[7] = 'r';
if (buf.st_mode & S_IWOTH)
perms[8] = 'w';
if (buf.st_mode & S_IXOTH)
perms[9] = 'x';
struct tm *tm = localtime(&buf.st_mtime);
char file[30] = { '\0' };
strftime(file, sizeof(file), "%m-%d %H:%M", tm);
printf("%s %2d %s %s %10ld %s %s\n", perms, buf.st_nlink, getpwuid(
buf.st_uid)->pw_name, getgrgid(buf.st_gid)->gr_name, buf.st_size,
file, filename);
}
char* split(char *src,char *right)
{
char *temp = malloc(32);
strcpy(temp,src);
char *p = strrchr(temp,'/');
*p = '\0';
p++;
strcpy(right,p);
return temp;
}
void ls(char *pathname) {
struct stat buf;
if (stat(pathname, &buf) == -1) {
printf("path not exist\n");
return;
}
if (S_ISREG(buf.st_mode)) {
char name[20]={'\0'};
char *temp = split(pathname,name);
ls_file(temp, name);
free(temp);
} else if (S_ISDIR(buf.st_mode)) {
DIR *pdir = opendir(pathname);
struct dirent *pdirent = NULL;
while ((pdirent = readdir(pdir)) != NULL) {
ls_file(pathname, pdirent->d_name);
}
closedir(pdir);
}
}
int main(int argc, char *argv[]) {
char a[30]="/wepull/a.txt";
char b[30]={'\0'};
char *c = split(a,b);
printf("content:%s,%s\n",c,b);
ls("/bak/a.txt");//你的目录名
ls("/bak");
return 0;
}