ls -l -a -R 的简单实现
目标
*在所有目录下都可以使用
*实现任意l,R,a组合
*可以实现在根目录下的递归
说在前面
这是笔者第一次写比较大全面的东西，好多代码格式和命名不太规范可读性比较差，可能自己还是比较菜，重构了三次，才写出相对完整的代码。
分函数代码
1.void my_err(const char *err_string, int line) //错误处理函数
void my_err(const char *err_string, int line)
{
fprintf(stderr, "ine:%d", line);
perror(err_string);
exit(EXIT_FAILURE);
}
2.void file_info(char *path, infoma *file) //文件各种属性解析
void file_info(char *path, infoma *file)
{
char buf_time[32];
struct passwd *psd;
struct group *grp;
char *qw = getcwd(NULL, 0);
assert(qw != NULL);
chdir(path);
if (S_ISLNK(file->asd.st_mode))
printf("l");
else if (S_ISREG(file->asd.st_mode))
printf("-");
else if (S_ISDIR(file->asd.st_mode))
printf("d");
else if (S_ISCHR(file->asd.st_mode))
printf("c");
else if (S_ISBLK(file->asd.st_mode))
printf("b");
else if (S_ISFIFO(file->asd.st_mode))
printf("f");
// else if (S_ISSOCK(file->asd.st_mode))
// printf("a");
if (file->asd.st_mode & S_IRUSR) //所有者
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWUSR)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXUSR)
printf("x");
else
{
printf("-");
}
if (file->asd.st_mode & S_IRGRP) //所在组
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWGRP)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXGRP)
printf("x");
else
{
printf("-");
}
if (file->asd.st_mode & S_IROTH) //其他用户
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWOTH)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXOTH)
printf("x");
else
{
printf("-");
}
if ((psd = getpwuid(file->asd.st_uid)) == NULL)
my_err("getpwuid", __LINE__);
if ((grp = getgrgid(file->asd.st_gid)) == NULL)
my_err("getgrgid", __LINE__);
printf("%4lu ", file->asd.st_nlink);
printf("%-8s ", psd->pw_name);
printf("%-8s", grp->gr_name);
printf("%6ld", file->asd.st_size);
strcpy(buf_time, ctime(&file->asd.st_mtime));
buf_time[strlen(buf_time) - 1] = '\0';
printf(" %s", buf_time);
if (play_R != 1 || flag != 0)
chdir(qw);
free(qw);
}
3.void file_name(const char *path) //目录解析文件名
void file_name(const char *path) //目录解析文件名
{
DIR *dir;
infoma wer;
struct dirent *zea;
char **a = (char **)malloc(sizeof(char *) * 1024 * 4);
dir = opendir(path);
int t = 0;
char *o = getcwd(NULL, 0);
// if (strcmp(o, path) != 0)
// {
// strcat(o, "/");
// strcat(o, path);
// }
if (play_R == 1)
{
if (yu == 1)
{
printf("当前目录%s", path);
yu--;
}
else
printf("当前目录%s", o);
if (strcmp(o, path) != 0)
printf("/%s\n", path);
else
printf("\n");
chdir(path);
}
free(o);
while ((zea = readdir(dir)) != NULL)
{
if (!play_a && zea->d_name[0] == '.')
continue;
a[t] = (char *)malloc(strlen(zea->d_name) + 1);
assert(a[t] != NULL);
strcpy(a[t], zea->d_name);
t++;
}
closedir(dir);
qsort(a, t, sizeof(char *), cmp);
for (int i = 0; i < t; i++)
{
if (play_l == 1)
{
if (lstat(a[i], &(wer.asd)) == -1)
{
printf("\n%s", a[i]);
my_err("stat", __LINE__);
}
file_info(a[i], &wer);
}
printf(" %s\n", a[i]);
}
if (play_R == 1)
{
for (int i = 0; i < t; i++)
{
if (strcmp(a[i], ".") == 0 || strcmp(a[i], "..") == 0)
continue;
if (lstat(a[i], &(wer.asd)) == -1)
{
**//这里是不断回朔，用了最直接的办法设立最大目录件**
while (jk--) **//然后找到该文件后就退出**
{
chdir("../");
if (lstat(a[i], &(wer.asd)) != -1)
break;
}
}
if (S_ISDIR(wer.asd.st_mode))
file_name(a[i]);
flag = t - i;
}
for (int i = 0; i < t; i++)
{
free(a[t]);
}
free(a);
}
}
4.void file_can(const char a[]) //解析参数
void file_can(const char a[]) //解析参数
{
for (size_t i = 0; i < strlen(a); i++)
{
switch (a[i])
{
case 'a':
play_a = 1;
continue;
case 'l':
play_l = 1;
continue;
case 'R':
play_R = 1;
continue;
default:
printf("暂无%c参数", a[i]);
exit(1);
}
}
}
整体代码
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include <assert.h>
int play_l = 0;
int play_a = 0;
int play_R = 0;
int flag = 1;
int jk = 4096;
int yu = 1;
int we = 0;
typedef struct
{
struct stat asd;
struct dirent ptr;
} infoma;
void my_err(const char *err_string, int line)
{
fprintf(stderr, "ine:%d", line);
perror(err_string);
exit(EXIT_FAILURE);
}
void file_info(char *path, infoma *file)
{
char buf_time[32];
struct passwd *psd;
struct group *grp;
char *qw = getcwd(NULL, 0);
assert(qw != NULL);
chdir(path);
if (S_ISLNK(file->asd.st_mode))
printf("l");
else if (S_ISREG(file->asd.st_mode))
printf("-");
else if (S_ISDIR(file->asd.st_mode))
printf("d");
else if (S_ISCHR(file->asd.st_mode))
printf("c");
else if (S_ISBLK(file->asd.st_mode))
printf("b");
else if (S_ISFIFO(file->asd.st_mode))
printf("f");
// else if (S_ISSOCK(file->asd.st_mode))
// printf("a");
if (file->asd.st_mode & S_IRUSR) //所有者
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWUSR)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXUSR)
printf("x");
else
{
printf("-");
}
if (file->asd.st_mode & S_IRGRP) //所在组
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWGRP)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXGRP)
printf("x");
else
{
printf("-");
}
if (file->asd.st_mode & S_IROTH) //其他用户
printf("r");
else
{
printf("-");
}
if (file->asd.st_mode & S_IWOTH)
printf("w");
else
{
printf("-");
}
if (file->asd.st_mode & S_IXOTH)
printf("x");
else
{
printf("-");
}
if ((psd = getpwuid(file->asd.st_uid)) == NULL)
my_err("getpwuid", __LINE__);
if ((grp = getgrgid(file->asd.st_gid)) == NULL)
my_err("getgrgid", __LINE__);
printf("%4lu ", file->asd.st_nlink);
printf("%-8s ", psd->pw_name);
printf("%-8s", grp->gr_name);
printf("%6ld", file->asd.st_size);
strcpy(buf_time, ctime(&file->asd.st_mtime));
buf_time[strlen(buf_time) - 1] = '\0';
printf(" %s", buf_time);
if (play_R != 1 || flag != 0)
chdir(qw);
free(qw);
}
int cmp(const void *a, const void *b)
{
char *c = *(char **)a;
char *d = *(char **)b;
return strcmp(c, d);
}
void file_name(const char *path) //目录解析文件名
{
DIR *dir;
infoma wer;
struct dirent *zea;
char **a = (char **)malloc(sizeof(char *) * 1024 * 4);
dir = opendir(path);
int t = 0;
char *o = getcwd(NULL, 0);
// if (strcmp(o, path) != 0)
// {
// strcat(o, "/");
// strcat(o, path);
// }
if (play_R == 1)
{
if (yu == 1)
{
printf("当前目录%s", path);
yu--;
}
else
printf("当前目录%s", o);
if (strcmp(o, path) != 0)
printf("/%s\n", path);
else
printf("\n");
chdir(path);
}
free(o);
while ((zea = readdir(dir)) != NULL)
{
if (!play_a && zea->d_name[0] == '.')
continue;
a[t] = (char *)malloc(strlen(zea->d_name) + 1);
assert(a[t] != NULL);
strcpy(a[t], zea->d_name);
t++;
}
closedir(dir);
qsort(a, t, sizeof(char *), cmp);
for (int i = 0; i < t; i++)
{
if (play_l == 1)
{
if (lstat(a[i], &(wer.asd)) == -1)
{
printf("\n%s", a[i]);
my_err("stat", __LINE__);
}
file_info(a[i], &wer);
}
printf(" %s\n", a[i]);
}
if (play_R == 1)
{
for (int i = 0; i < t; i++)
{
if (strcmp(a[i], ".") == 0 || strcmp(a[i], "..") == 0)
continue;
if (lstat(a[i], &(wer.asd)) == -1)
{
while (jk--)
{
chdir("../");
if (lstat(a[i], &(wer.asd)) != -1)
break;
}
}
if (S_ISDIR(wer.asd.st_mode))
file_name(a[i]);
flag = t - i;
}
for (int i = 0; i < t; i++)
{
free(a[t]);
}
free(a);
}
}
void file_can(const char a[]) //解析参数
{
for (size_t i = 0; i < strlen(a); i++)
{
switch (a[i])
{
case 'a':
play_a = 1;
continue;
case 'l':
play_l = 1;
continue;
case 'R':
play_R = 1;
continue;
default:
printf("暂无%c参数", a[i]);
exit(1);
}
}
}
int main(int argc, char **argv)
{
char a[7] = "";
char *path = NULL;
int t = 0;
for (int i = 1; i < argc; i++)
{
if (argv[i][0] == '-')
{
for (unsigned int j = 1; j < strlen(argv[i]); j++)
{
a[t] = argv[i][j];
t++;
}
}
else
{
path = argv[i];
}
}
if (path == NULL)
{
path = getcwd(NULL, 0);
we = 1;
}
file_can(a);
file_name(path);
if (we == 1)
free(path);
}