c实现ls功能-王喜燕
myls.h
#ifndef __MYLS_H
#define __MYLS_H
#define BUFSIZE 1024
static int sum_blocks(const char *path);
static int mydu(const char *path);
static int is_dot_dir(const char *path);
int myls_h(const char *path);
int myls_a(char *path);
int myls_i(char *path);
int myls_l(char *path);
int allstat(char *path);
int myls(int argc,char **argv);
#endif
myls.c
#include "myls.h"
#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/stat.h>
#include<string.h>
#include<glob.h>
#include<errno.h>
#include<dirent.h>
#include<time.h>
#include<grp.h>
#include<pwd.h>
/*实现ls -h功能*/
int myls_h(const char *path)
{
glob_t globres;
struct stat cur_stat;
char buf[BUFSIZE] = {};
if (lstat(path, &cur_stat) < 0) {
perror("lstat()");
return 1;
}
if (!S_ISDIR(cur_stat.st_mode)) {
printf("%s",path);
return 1;
}
strcpy(buf, path);
strcat(buf, "/*");
if (glob(buf, GLOB_NOSORT, NULL, &globres) != 0) {
fprintf(stderr, "glob error\n");
return 1;
}
for (int i = 0; i < globres.gl_pathc; i++) {
printf("%-15s ",(globres.gl_pathv)[i]);
}
puts("\n");
globfree(&globres);
return 0;
}
int myls_i(char *path)
{
struct stat cur_stat;
int a;
glob_t globre;
a = lstat(path, &cur_stat);
char buf[BUFSIZE] = {};
if(a<0)
{
perror("lstat()");
return 1;
}
if(!S_ISDIR(cur_stat.st_mode))
{
printf("%ld %s\n ",cur_stat.st_ino,path);
return 1;
}
strcpy(buf,path);
strcat(buf,"/*");
glob(buf,0,NULL,&globre);
for(int i = 0;i<globre.gl_pathc;i++)
{
if(lstat(((globre.gl_pathv)[i]),&cur_stat)<0)
{
perror("lstat()");
return 1;
}
printf("%5ld %5s ",cur_stat.st_ino,globre.gl_pathv[i]);
}
puts("\n");
globfree(&globre);
return 0;
}
/*实现ls -a功能*/
int myls_a(char *path)
{
DIR *dp = NULL;
struct dirent *entry = NULL;
struct stat cur_stat;
if (lstat(path, &cur_stat) < 0) {
perror("lstat()");
return 1;
}
if (!S_ISDIR(cur_stat.st_mode)) {
printf("%s",path);
}
dp = opendir(path);
if (NULL == dp) {
perror("opendir()");
return 1;
}
// read
while (1) {
entry = readdir(dp);
if (NULL == entry) {
if (errno) {
perror("readdir()");
goto ERROR;
}
break;
}
printf("%-10s ", entry->d_name);
}
closedir(dp);
puts("\n");
return 0;
ERROR:
closedir(dp);
return 1;
}
/*文件的状态信息*/
int allstat(char *path)
{
struct stat mystat;
struct passwd *paswdname = NULL;
struct group *grname = NULL;
struct tm *tmp = NULL;
char buf[BUFSIZE] = {};
int a;
a = stat(path,&mystat);
if(a == -1)
{
perror("stat()");
return 1;
}
/*文件的类型*/
switch(mystat.st_mode & S_IFMT)
{
case S_IFREG : printf("-"); break;
case S_IFDIR : printf("d"); break;
case S_IFCHR : printf("c"); break;
case S_IFBLK : printf("b"); break;
case S_IFSOCK : printf("s"); break;
case S_IFLNK : printf("l"); break;
case S_IFIFO : printf("p"); break;
default : break;
}
/*文件的权限*/
if(mystat.st_mode & S_IRUSR)
putchar('r');
else
putchar('-');
if(mystat.st_mode & S_IWUSR)
putchar('w');
else
putchar('-');
if(mystat.st_mode & S_IXUSR)
{
if(mystat.st_mode & S_ISUID)
putchar('s');
else
putchar('x');
}
else
putchar('-');
if(mystat.st_mode & S_IRGRP)
putchar('r');
else
putchar('-');
if(mystat.st_mode & S_IWGRP)
putchar('w');
else
putchar('-');
if(mystat.st_mode & S_IXGRP)
{
if(mystat.st_mode & S_ISGID)
putchar('s');
else
putchar('x');
}
else
putchar('-');
if(mystat.st_mode & S_IROTH)
putchar('r');
else
putchar('-');
if(mystat.st_mode & S_IWOTH)
putchar('w');
else
putchar('-');
if(mystat.st_mode & S_IXOTH)
{
if(mystat.st_mode & S_ISVTX)
putchar('t');
else
putchar('x');
}
else
putchar('-');
printf("%5ld ",mystat.st_nlink);
paswdname = getpwuid(mystat.st_uid);
printf("%5s ", paswdname->pw_name);
grname = getgrgid(mystat.st_gid);
printf("%5s ", grname->gr_name);
printf("%5ld ",mystat.st_size);
tmp = localtime(&mystat.st_mtime);
if(tmp == NULL)
return 1;
strftime(buf, BUFSIZE, "%m月 %d %H:%M", tmp);
printf("%5s ", buf);
printf("%5s ", path);
putchar('\n');
return 0;
}
/*实现ls -l功能*/
int myls_l(char *path)
{
glob_t globres;
struct stat cur_stat;
char buf[BUFSIZE] = {};
if (lstat(path, &cur_stat) < 0) {
perror("lstat()");
return 1;
}
if (!S_ISDIR(cur_stat.st_mode)) {
allstat(path);
return 1;
}
strcpy(buf, path);
strcat(buf, "/*");
if (glob(buf, GLOB_NOSORT, NULL, &globres) != 0) {
fprintf(stderr, "glob error\n");
return 1;
}
for (int i = 0; i < globres.gl_pathc; i++) {
allstat((globres.gl_pathv)[i]);
}
globfree(&globres);
return 0;
}
int myls(int argc ,char **argv)
{
int c;
char *opt = "-l:a:i:h:";
while(1)
{
if(c == -1)
break;
c = getopt(argc,argv,opt);
switch(c)
{
case 'l':
myls_l(optarg);
break;
case 'a':
myls_a(optarg);
break;
case 'i':
myls_i(optarg);
break;
case 'h':
myls_h(optarg);
break;
case '?':
printf("不认识此选项%s\n", argv[optind-1]);
break;
case 1:
printf("非选项参数%s\n", argv[optind-1]);
break;
default:
break;
}
}
return 0;
}
main.c
#include "myls.h"
#include<stdio.h>
/*主函数*/
int main(int argc,char **argv)
{
if(argc < 3)
return 1;
myls(argc,argv);
return 0;
}
makefile
main :main.o myls.o
gcc main.o myls.o -o main
clean:
rm -rf *.o main
