ls.c

   1 #include "types.h"
   2 #include "stat.h"
   3 #include "user.h"
   4 #include "fs.h"
   5
   6 char*
   7 fmtname(char *path)
   8 {
   9   static char buf[DIRSIZ+1];
  10   char *p;
  11
  12   // Find first character after last slash.
  13   for(p=path+strlen(path); p >= path && *p != '/'; p--)
  14     ;
  15   p++;
  16
  17   // Return blank-padded name.
  18   if(strlen(p) >= DIRSIZ)
  19     return p;
  20   memmove(buf, p, strlen(p));
  21   memset(buf+strlen(p), ' ', DIRSIZ-strlen(p));
  22   return buf;
  23 }
  24
  25 void
  26 ls(char *path)
  27 {
  28   char buf[512], *p;
  29   int fd;
  30   struct dirent de;
  31   struct stat st;
  32
  33   if((fd = open(path, 0)) < 0){
  34     printf(2, "ls: cannot open %s\n", path);
  35     return;
  36   }
  37
  38   if(fstat(fd, &st) < 0){
  39     printf(2, "ls: cannot stat %s\n", path);
  40     close(fd);
  41     return;
  42   }
  43
  44   switch(st.type){
  45   case T_FILE:
  46     printf(1, "%s %d %d %d\n", fmtname(path), st.type, st.ino, st.size);
  47     break;
  48
  49   case T_DIR:
  50     if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
  51       printf(1, "ls: path too long\n");
  52       break;
  53     }
  54     strcpy(buf, path);
  55     p = buf+strlen(buf);
  56     *p++ = '/';
  57     while(read(fd, &de, sizeof(de)) == sizeof(de)){
  58       if(de.inum == 0)
  59         continue;
  60       memmove(p, de.name, DIRSIZ);
  61       p[DIRSIZ] = 0;
  62       if(stat(buf, &st) < 0){
  63         printf(1, "ls: cannot stat %s\n", buf);
  64         continue;
  65       }
  66       printf(1, "%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
  67     }
  68     break;
  69   }
  70   close(fd);
  71 }
  72
  73 int
  74 main(int argc, char *argv[])
  75 {
  76   int i;
  77
  78   if(argc < 2){
  79     ls(".");
  80     exit();
  81   }
  82   for(i=1; i<argc; i++)
  83     ls(argv[i]);
  84   exit();
  85 }