sllul/ls.c

#include "kernel/types.h"
#include "kernel/stat.h"
#include "user/user.h"
#include "kernel/fs.h"
#include "mkfs/fsformat.h"
#include "kernel/fcntl.h"

char buf[FSFORMAT_NAMESIZE_NEW+1];

char*
fmtname(char *path)
{
  char *p;

  // Find first character after last slash.
  for(p=path+strlen(path); p >= path && *p != '/'; p--)
    ;
  p++;

  // Return blank-padded name.
  if(strlen(p) >= 32)
    return p;
  memmove(buf, p, strlen(p));
  memset(buf+strlen(p), ' ', 32-strlen(p));
  return buf;
}

// Syscall to get dirents in standardised format
int lsdir(int fd, void* buff, int sz);

void
ls(char *path)
{
  char buf[512], *p;
  int fd;
  fsformat_dirent_v1_t de;
  struct stat st;

  if((fd = open(path, O_RDONLY)) < 0){
    fprintf(2, "ls: cannot open %s\n", path);
    return;
  }

  if(fstat(fd, &st) < 0){
    fprintf(2, "ls: cannot stat %s\n", path);
    close(fd);
    return;
  }

  switch(st.type){
  case T_DEVICE:
  case T_FILE:
    printf("%s %d %d %d\n", fmtname(path), st.type, st.ino, (int) (st.size));
    break;

  case T_DIR:
    if(strlen(path) + 1 + FSFORMAT_NAMESIZE_NEW + 1 > 512 /*sizeof buf*/){
      printf("ls: path too long\n");
      break;
    }
    strcpy(buf, path);
    p = buf+strlen(buf);
    *p++ = '/';
    while(lsdir(fd, &de, sizeof(fsformat_dirent_v1_t /*de*/)) == sizeof(fsformat_dirent_v1_t /*de*/)){
      if(de.datainode == 0)
        continue;
      memmove(p, de.filename, FSFORMAT_NAMESIZE_NEW);
      p[FSFORMAT_NAMESIZE_NEW] = 0;
      if(stat(buf, &st) < 0){
        printf("ls: cannot stat %s\n", buf);
        continue;
      }
      printf("%s %d %d %d\n", fmtname(buf), st.type, st.ino, (int) (st.size));
    }
    break;
  }
  close(fd);
}

int
main(int argc, char *argv[])
{
  int i;

  if(argc < 2){
    ls(".");
    exit(0);
  }
  for(i=1; i<argc; i++)
    ls(argv[i]);
  exit(0);
}