C++ (Cpp) _fitoa_word示例

示例#1

文件： ttyname.c 项目： Lind-Project/Lind-GlibC

/* Return the pathname of the terminal FD is open on, or NULL on errors.
   The returned storage is good only until the next call to this function.  */
char *
ttyname (int fd)
{
  static size_t buflen;
  char procname[30];
  struct stat64 st, st1;
  int dostat = 0;
  char *name;
  int save = errno;
  struct termios term;

  /* isatty check, tcgetattr is used because it sets the correct
     errno (EBADF resp. ENOTTY) on error.  */
  if (__builtin_expect (__tcgetattr (fd, &term) < 0, 0))
    return NULL;

  /* We try using the /proc filesystem.  */
  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';

  if (buflen == 0)
    {
      buflen = 4095;
      ttyname_buf = (char *) malloc (buflen + 1);
      if (ttyname_buf == NULL)
	{
	  buflen = 0;
	  return NULL;
	}
    }

  ssize_t len = __readlink (procname, ttyname_buf, buflen);
  if (__builtin_expect (len == -1 && errno == ENOENT, 0))
    {
      __set_errno (EBADF);
      return NULL;
    }

  if (__builtin_expect (len != -1
#ifndef __ASSUME_PROC_SELF_FD_SYMLINK
			/* This is for Linux 2.0.  */
			&& ttyname_buf[0] != '['
#endif
			, 1))
    {
      if ((size_t) len >= buflen)
	return NULL;
      /* readlink need not terminate the string.  */
      ttyname_buf[len] = '\0';
      return ttyname_buf;
    }

  if (__fxstat64 (_STAT_VER, fd, &st) < 0)
    return NULL;

  if (__xstat64 (_STAT_VER, "/dev/pts", &st1) == 0 && S_ISDIR (st1.st_mode))
    {
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev/pts", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev/pts", st.st_dev, st.st_ino, save, &dostat);
#endif
    }
  else
    {
      __set_errno (save);
      name = NULL;
    }

  if (!name && dostat != -1)
    {
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
    }

  if (!name && dostat != -1)
    {
      dostat = 1;
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
    }

  return name;
}

示例#2

文件： ttyname.c 项目： AubrCool/glibc

/* Return the pathname of the terminal FD is open on, or NULL on errors.
   The returned storage is good only until the next call to this function.  */
char *
ttyname (int fd)
{
  static size_t buflen;
  char procname[30];
  struct stat64 st, st1;
  int dostat = 0;
  char *name;
  int save = errno;
  struct termios term;

  /* isatty check, tcgetattr is used because it sets the correct
     errno (EBADF resp. ENOTTY) on error.  */
  if (__glibc_unlikely (__tcgetattr (fd, &term) < 0))
    return NULL;

  if (__fxstat64 (_STAT_VER, fd, &st) < 0)
    return NULL;

  /* We try using the /proc filesystem.  */
  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';

  if (buflen == 0)
    {
      buflen = 4095;
      ttyname_buf = (char *) malloc (buflen + 1);
      if (ttyname_buf == NULL)
	{
	  buflen = 0;
	  return NULL;
	}
    }

  ssize_t len = __readlink (procname, ttyname_buf, buflen);
  if (__glibc_likely (len != -1))
    {
      if ((size_t) len >= buflen)
	return NULL;

#define UNREACHABLE_LEN strlen ("(unreachable)")
      if (len > UNREACHABLE_LEN
	  && memcmp (ttyname_buf, "(unreachable)", UNREACHABLE_LEN) == 0)
	{
	  memmove (ttyname_buf, ttyname_buf + UNREACHABLE_LEN,
		   len - UNREACHABLE_LEN);
	  len -= UNREACHABLE_LEN;
	}

      /* readlink need not terminate the string.  */
      ttyname_buf[len] = '\0';

      /* Verify readlink result, fall back on iterating through devices.  */
      if (ttyname_buf[0] == '/'
	  && __xstat64 (_STAT_VER, ttyname_buf, &st1) == 0
#ifdef _STATBUF_ST_RDEV
	  && S_ISCHR (st1.st_mode)
	  && st1.st_rdev == st.st_rdev
#else
	  && st1.st_ino == st.st_ino
	  && st1.st_dev == st.st_dev
#endif
	  )
	return ttyname_buf;
    }

  if (__xstat64 (_STAT_VER, "/dev/pts", &st1) == 0 && S_ISDIR (st1.st_mode))
    {
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev/pts", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev/pts", st.st_dev, st.st_ino, save, &dostat);
#endif
    }
  else
    {
      __set_errno (save);
      name = NULL;
    }

  if (!name && dostat != -1)
    {
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
    }

  if (!name && dostat != -1)
    {
      dostat = 1;
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
    }

  return name;
}

示例#3

文件： ttyname_r.c 项目： JamesLinus/glibc-mips

/* Store at most BUFLEN character of the pathname of the terminal FD is
   open on in BUF.  Return 0 on success,  otherwise an error number.  */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
  char procname[30];
  struct stat64 st, st1;
  int dostat = 0;
  int save = errno;

  /* Test for the absolute minimal size.  This makes life easier inside
     the loop.  */
  if (!buf)
    {
      __set_errno (EINVAL);
      return EINVAL;
    }

  if (buflen < sizeof ("/dev/pts/"))
    {
      __set_errno (ERANGE);
      return ERANGE;
    }

  /* isatty check, tcgetattr is used because it sets the correct
     errno (EBADF resp. ENOTTY) on error.  */
  struct termios term;
  if (__glibc_unlikely (__tcgetattr (fd, &term) < 0))
    return errno;

  if (__fxstat64 (_STAT_VER, fd, &st) < 0)
    return errno;

  /* We try using the /proc filesystem.  */
  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';

  ssize_t ret = __readlink (procname, buf, buflen - 1);
  if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
    {
      __set_errno (ERANGE);
      return ERANGE;
    }

  if (__glibc_likely (ret != -1))
    {
#define UNREACHABLE_LEN strlen ("(unreachable)")
      if (ret > UNREACHABLE_LEN
	  && memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0)
	{
	  memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN);
	  ret -= UNREACHABLE_LEN;
	}

      /* readlink need not terminate the string.  */
      buf[ret] = '\0';

      /* Verify readlink result, fall back on iterating through devices.  */
      if (buf[0] == '/'
	  && __xstat64 (_STAT_VER, buf, &st1) == 0
#ifdef _STATBUF_ST_RDEV
	  && S_ISCHR (st1.st_mode)
	  && st1.st_rdev == st.st_rdev
#else
	  && st1.st_ino == st.st_ino
	  && st1.st_dev == st.st_dev
#endif
	  )
	return 0;
    }

  /* Prepare the result buffer.  */
  memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
  buflen -= sizeof ("/dev/pts/") - 1;

  if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
    {
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
			  &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
			  &dostat);
#endif
    }
  else
    {
      __set_errno (save);
      ret = ENOENT;
    }

  if (ret && dostat != -1)
    {
      buf[sizeof ("/dev/") - 1] = '\0';
      buflen += sizeof ("pts/") - 1;
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
			  &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
			  &dostat);
#endif
    }

  if (ret && dostat != -1)
    {
      buf[sizeof ("/dev/") - 1] = '\0';
      dostat = 1;
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,
			  save, &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,
			  save, &dostat);
#endif
    }

  return ret;
}

示例#4

文件： ttyname_r.c 项目： mbref/glibc-236-microblaze

/* Store at most BUFLEN character of the pathname of the terminal FD is
   open on in BUF.  Return 0 on success,  otherwise an error number.  */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
  char procname[30];
  struct stat64 st, st1;
  int dostat = 0;
  int save = errno;
  int ret;

  /* Test for the absolute minimal size.  This makes life easier inside
     the loop.  */
  if (!buf)
    {
      __set_errno (EINVAL);
      return EINVAL;
    }

  if (buflen < sizeof ("/dev/pts/"))
    {
      __set_errno (ERANGE);
      return ERANGE;
    }

  /* We try using the /proc filesystem.  */
  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';

  ret = __readlink (procname, buf, buflen - 1);
  if (ret == -1 && errno == ENOENT)
    {
      __set_errno (EBADF);
      return EBADF;
    }

  if (!__isatty (fd))
    {
      __set_errno (ENOTTY);
      return ENOTTY;
    }

  if (ret == -1 && errno == ENAMETOOLONG)
    {
      __set_errno (ERANGE);
      return ERANGE;
    }

  if (ret != -1 && buf[0] != '[')
    {
      buf[ret] = '\0';
      return 0;
    }

  if (__fxstat64 (_STAT_VER, fd, &st) < 0)
    return errno;

  /* Prepare the result buffer.  */
  memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
  buflen -= sizeof ("/dev/pts/") - 1;

  if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
    {
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
			  &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
			  &dostat);
#endif
    }
  else
    {
      __set_errno (save);
      ret = ENOENT;
    }

  if (ret && dostat != -1)
    {
      buf[sizeof ("/dev/") - 1] = '\0';
      buflen += sizeof ("pts/") - 1;
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
			  &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
			  &dostat);
#endif
    }

  if (ret && dostat != -1)
    {
      buf[sizeof ("/dev/") - 1] = '\0';
      dostat = 1;
#ifdef _STATBUF_ST_RDEV
      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,
			  save, &dostat);
#else
      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,
			  save, &dostat);
#endif
    }

  return ret;
}