root/user/ls.c

DEFINITIONS

1. fmtname
2. ls
3. main

   1 #include "kernel/types.h"
   2 #include "kernel/stat.h"
   3 #include "user/user.h"
   4 #include "kernel/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     fprintf(2, "ls: cannot open %s\n", path);
  35     return;
  36   }
  37 
  38   if(fstat(fd, &st) < 0){
  39     fprintf(2, "ls: cannot stat %s\n", path);
  40     close(fd);
  41     return;
  42   }
  43 
  44   switch(st.type){
  45   case T_DEVICE:
  46   case T_FILE:
  47     printf("%s %d %d %l\n", fmtname(path), st.type, st.ino, st.size);
  48     break;
  49 
  50   case T_DIR:
  51     if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
  52       printf("ls: path too long\n");
  53       break;
  54     }
  55     strcpy(buf, path);
  56     p = buf+strlen(buf);
  57     *p++ = '/';
  58     while(read(fd, &de, sizeof(de)) == sizeof(de)){
  59       if(de.inum == 0)
  60         continue;
  61       memmove(p, de.name, DIRSIZ);
  62       p[DIRSIZ] = 0;
  63       if(stat(buf, &st) < 0){
  64         printf("ls: cannot stat %s\n", buf);
  65         continue;
  66       }
  67       printf("%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
  68     }
  69     break;
  70   }
  71   close(fd);
  72 }
  73 
  74 int
  75 main(int argc, char *argv[])
  76 {
  77   int i;
  78 
  79   if(argc < 2){
  80     ls(".");
  81     exit(0);
  82   }
  83   for(i=1; i<argc; i++)
  84     ls(argv[i]);
  85   exit(0);
  86 }