Simple ll command implemented under Linux

/*     implementation ll command, output specified directory under Details      format:ll -l dirname      Table of contents in quick order, sorted by dictionary */#include  <stdio.h> #include  <dirent.h> #include  < stdlib.h> #include  <sys/stat.h> #include  <string.h> #include  <time.h> #include  <grp.h> #include  <pwd.h> #define  NUMLINE 40#define NUMCHAR 20/*      Generate Shield character */void mode_to_letters (int mode, char str[]) {     strcpy (str,  "----------");    if  (S_isdir (mode))  str[0] =  ' d ';    if  (S_ISCHR (mode))  str[0] =  ' C ';     if   (S_ISBLK (mode))  str[0] =  ' B ';        if  ( MODE&NBSP;&AMP;&NBSP;S_IRUSR)  str[1] =  ' R ';    if  (mode & &NBSP;S_IWUSR)  str[2] =  ' W ';    if  (mode & s_ixusr)  str[3] =  ' x ';         if  (MODE&NBSP;&AMP;&NBSP;S_IRGRP)  str[4] =  ' R ';     if  (MODE&NBSP;&AMP;&NBSP;S_IWGRP)  str[5] =  ' W ';     if  (MODE&NBSP;&AMP;&NBSP;S_IXGRP)  str[6] =  ' x ';         if  (Mode & s_iroth)  str[7] =  ' R ';     if   (Mode & s_iwoth)  str[8] =  ' W ';    if  (mode  & s_ixoth)  str[9] =  ' x ';         str[10] =   ' + ';} /*     string Exchange */void exchange (CHAR&NBSP;*S1,&NBSP;CHAR&NBSP;*S2) {     char buf[20];    strcpy (BUF,&NBSP;S1);         strcpy (S1,  s2);     strcpy (S2,&NBSP;BUF);} /*     string Sort */void sort (char filename[][numchar], int beg, int  end) {    int n = beg + 1;    int m  = end;    if  (beg >= end)          return;    while  ( n < m)          if  (strcmp (Filename[n], filename[beg])  > 0)               while  (n < m)                  if  (filename[m] <  Filename[beg])  {                     exchange (filename[m--], filename[n++]);                     break;                 }                 else                     m--;        else              n++;    if  (strcmp (filename[n],  Filename[beg]  > 0)         exchange (filename[--n],  Filename[beg]);     else        exchange (filename[n ], filename[beg]);     sort (filename, 0, n-1);     sort ( Filename, n+1, end);}/*     through the Getpwuid function, the user ID is obtained by the username */char* get_username (uid_t uid) {     struct passwd *ptr;    if  ((Ptr=getpwuid (UID))  == null) {         fprintf (stderr,  "Get username error");         exit (1);     }    return  ptr->pw_name;} /*     Get Group name */char* get_groupname (gid_t gid) {    struct by group ID  group *ptr;    if  (Ptr = getgrgid (GID))  == null)  {        fprintf (stderr,  "Get groupname error");         exit (1);    }     Return ptr->gr_name;} /*     Time format Conversion */void timetrans (time_t *tim, char* s) {&NBsp;   struct tm *temp;    temp = localtime (Tim);     strftime (s, 20,  "%m %e %r",  temp);} Int main (int argc, char* argv[]) {    dir* dr;     struct dirent* dir;    char filename[NUMLINE][NUMCHAR];     struct stat buf;    int n, m, p;     char s1[11];    char tim[20];    struct tm * temp;    if  (argc < 3)  {         fprintf (stderr,  "Ls02:missing operand");         exit (1 );    }    if  (strcmp (argv[1],  "-L"))  {         fprintf (STDERR,&NBSP; " Ls02: operand:%s is wrong ",  argv[1]);         exit ( 1);     }    dr = opendir (argv[2]);     if   (Dr == null)  {        perror (argv[2]);         exit (1);     }    m =  0;    while  ((Dir = readdir (DR)  != null)  {          if  (strcpy (filename[m], argv[2])  == null)  {            perror ("Strcpy error");             exit (1);         }        strcpy (filename[m], argv[2]);      &nBsp;  p = 0;        while (filename[m][p++] !=   '  ;        strcpy ') (&filename[m][p-1], dir->d _name);        m++;    }     Sort (filename, 0, --m);    for  (n = 0;n <= m;n++)          if  (Stat (FILENAME[N],&NBSP;&AMP;BUF)  == - 1)             printf ("stat error\n");         else {             mode_to_letters (BUF.ST_MODE,&NBSP;S1);             timetrans (&buf.st_mtime, tim);             printf ("%s %4d %s ",  s1, buf.st_nlink, get_username (buf.st_uid));             printf ("%s %7d %s %s\n",  get_ GroupName (Buf.st_gid),  (int) buf.st_size, tim, &filename[n][p-1]);         }        closedir (DR);}

Summarize:

Delayed the time in the fast sort place

Two-dimensional arrays do function parameters, 2nd dimension cannot be empty

/*    ls Command      format:  ls dirname*/#include  <stdio.h># include <dirent.h> #include  <stdlib.h>int main (int argc, char* argv[] ) {    dir* dr;    struct dirent* dir;     if  (argc == 1)  {        fprintf (stderr,   "Ls01:missing operand");         exit (1);     }    dr = opendir (Argv[1]);    if  (dr ==  null)  {        perror (argv[1]);         exit (1);    }    while  (dir =  Readdir (DR)  != null)         //if  (Dir->d_name[0]  !=  '. ')             printf ("%s ",  dir->d_name);     printf ("\ n");     closedir (DR);}

Simple ll command implemented under Linux