ls code

panos_liu 2007-01-11

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

int main(int argc, char *argv[])
{
      DIR *dp;
      struct dirent *dirp;
      char path[MAXNAMLEN + 1];
      struct stat sb;
      char mode[10];

      const char *time_fmt = "%Y-%m-%d %H:%M:%S";
      char fdate[20];

      if (argc == 1)
      {
            strcpy(path, ".");
      }
      else if (argc == 2)
      {
            strcpy(path, argv[1]);
      }
      else
      {
            printf("cannot ls too few directories.\n");
            return 0;
      }

      if ((dp = opendir(path)) == NULL)
      {
            printf("cannot open this directories.\n");
            return 0;
      }

      while ((dirp = readdir(dp)) != NULL)
      {
            stat(dirp->d_name, &sb);
            mode[9] = (sb.st_mode & S_IFDIR) ? ‘d‘ : ‘-‘;
            if (sb.st_mode & S_IFIFO)
                     mode[9] = ‘i‘;
            else if (sb.st_mode & S_IFCHR)
                     mode[9] = ‘c‘;
            else if (sb.st_mode & S_IFDIR)
                     mode[9] = ‘d‘;
            else if (sb.st_mode & S_IFBLK)
                     mode[9] = ‘b‘;
            else if (sb.st_mode & S_IFREG)
                     mode[9] = ‘-‘;
            else if (sb.st_mode & S_IFLNK)
                     mode[9] = ‘l‘;
            else if (sb.st_mode & S_IFSOCK)
                     mode[9] = ‘s‘;
            else if (sb.st_mode & S_IFWHT)
                     mode[9] = ‘w‘;
            else if (sb.st_mode & S_ISUID)
                     mode[9] = ‘u‘;
            else if (sb.st_mode & S_ISGID)
                     mode[9] = ‘g‘;
            else
                     mode[9] = ‘ ‘;

            strftime(fdate, sizeof(fdate), time_fmt, localtime(&(sb.st_ctime)));
            printf("%crwxr--r-- %5d %5d %8d", mode[9],sb.st_uid, sb.st_gid, sb.st_size);
            printf("  %20s  %-16s\n", fdate, dirp->d_name);
      }

      closedir(dp);

      return 0;
}