/*********************************************************************************
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* Copyright: (C) 2023 LingYun IoT System Studio.
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* All rights reserved.
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*
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* Filename: mycp.c
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* Description: This file is ls command example code.
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*
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* Version: 1.0.0(2023年08月08日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2023年08月08日 17时17分00秒"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <time.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define PROGNAME "myls"
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static int myls(char *path);
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int main (int argc, char **argv)
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{
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int fd;
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int i;
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if( 1 == argc )
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{
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myls(".");
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return 0;
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}
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for(i=1; i<argc; i++)
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{
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myls(argv[i]);
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}
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return 0;
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}
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void print_filemode(mode_t mode)
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{
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/* print file type */
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if( S_ISREG(mode) )
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{
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printf("-");
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}
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else if( S_ISDIR(mode) )
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{
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printf("d");
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}
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else if( S_ISCHR(mode) )
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{
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printf("c");
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}
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else if( S_ISBLK(mode) )
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{
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printf("b");
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}
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else if( S_ISFIFO(mode) )
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{
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printf("f");
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}
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else if( S_ISLNK(mode) )
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{
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printf("l");
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}
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else if( S_ISSOCK(mode) )
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{
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printf("s");
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}
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/* print file mode */
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printf("%c", (S_IRUSR&mode) ? 'r' : '-');
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printf("%c", (S_IWUSR&mode) ? 'w' : '-');
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printf("%c", (S_IXUSR&mode) ? 'x' : '-');
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printf("%c", (S_IRGRP&mode) ? 'r' : '-');
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printf("%c", (S_IWGRP&mode) ? 'w' : '-');
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printf("%c", (S_IXGRP&mode) ? 'x' : '-');
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printf("%c", (S_IROTH&mode) ? 'r' : '-');
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printf("%c", (S_IWOTH&mode) ? 'w' : '-');
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printf("%c", (S_IXOTH&mode) ? 'x' : '-');
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printf(" ");
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return ;
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}
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int print_info(char *file)
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{
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struct stat sbuf;
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struct passwd *u;
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struct group *g;
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time_t t;
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struct tm *ptm;
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char mtime[32];
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stat(file, &sbuf);
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print_filemode(sbuf.st_mode);
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/* print number of hard links */
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printf("%2lu ", sbuf.st_nlink);
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/* print user name or user id */
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u = getpwuid (sbuf.st_uid);
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if( u )
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printf("%s ", u->pw_name);
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else
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printf("%d ", sbuf.st_uid);
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/* print group name or group id */
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g = getgrgid (sbuf.st_gid);
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if( g )
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printf("%s ", g->gr_name);
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else
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printf("%d ", sbuf.st_uid);
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/* print file size */
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printf("%6lu ", sbuf.st_size);
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/* print time of last modification, Time functions:
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* https://www.jianshu.com/p/e92ced44f216
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* https://blog.csdn.net/chen1415886044/article/details/106883544
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*/
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t = (time_t)sbuf.st_mtim.tv_sec;
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ptm = localtime(&t);
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strftime(mtime, sizeof(mtime), "%b %e %R", ptm);
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printf("%s ", mtime);
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printf("%s", file);
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printf("\n");
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return 0;
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}
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int myls(char *path)
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{
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struct stat sbuf;
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DIR *dirp;
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struct dirent *dir;
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char filepath[512];
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/* Check file exist or not */
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if( access(path, F_OK) )
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{
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printf("%s: cannot access '%s': %s\n", PROGNAME, path, strerror(errno));
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return -2;
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}
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stat(path, &sbuf);
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/* list file */
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if( !S_ISDIR(sbuf.st_mode) )
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{
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print_info(path);
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return 0;
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}
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/* list folder */
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dirp = opendir(path);
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if( !dirp )
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{
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printf("%s: cannot open directory '%s': %s\n", PROGNAME, path, strerror(errno));
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return -3;
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}
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while( NULL != (dir=readdir(dirp)) )
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{
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if( !strcmp(path, ".") )
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strncpy(filepath, dir->d_name, sizeof(filepath));
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else
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snprintf(filepath, sizeof(filepath), "%s/%s", path, dir->d_name);
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print_info(filepath);
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}
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return 0;
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}
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