getconf.c

android-w.song.android.widget

#if defined (_SC_XOPEN_LEGACY)
  { "_XOPEN_LEGACY",		SYSCONF,	_SC_XOPEN_LEGACY	},
#endif /* _SC_XOPEN_LEGACY */
#if defined (_SC_XOPEN_REALTIME)
  { "_XOPEN_REALTIME",		SYSCONF,	_SC_XOPEN_REALTIME	},
#endif
#if defined (_SC_XOPEN_REALTIME_THREADS)
  { "_XOPEN_REALTIME_THREADS",	SYSCONF,	_SC_XOPEN_REALTIME_THREADS },
#endif
#if defined (_SC_XOPEN_SHM)
  { "_XOPEN_SHM",		SYSCONF,	_SC_XOPEN_SHM		},
#endif
#if defined (_SC_XOPEN_STREAMS)
  { "_XOPEN_STREAMS",		SYSCONF,	_SC_XOPEN_STREAMS	},
#endif
#if defined (_SC_XOPEN_UNIX)
  { "_XOPEN_UNIX",		SYSCONF,	_SC_XOPEN_UNIX		},
#endif
#if defined (_SC_XOPEN_VERSION)
  { "_XOPEN_VERSION",		SYSCONF,	_SC_XOPEN_VERSION	},
#endif
#if defined (_SC_XOPEN_XCU_VERSION)
  { "_XOPEN_XCU_VERSION",	SYSCONF,	_SC_XOPEN_XCU_VERSION	},
#endif
#if defined (_SC_XOPEN_XPG2)
  { "_XOPEN_XPG2",		SYSCONF,	_SC_XOPEN_XPG2		},
#endif
#if defined (_SC_XOPEN_XPG3)
  { "_XOPEN_XPG3",		SYSCONF,	_SC_XOPEN_XPG3		},
#endif
#if defined (_SC_XOPEN_XPG4)
  { "_XOPEN_XPG4",		SYSCONF,	_SC_XOPEN_XPG4		},
#endif
#if defined (_SC_XOPEN_XPG5)
  { "_XOPEN_XPG5",		SYSCONF,	_SC_XOPEN_XPG5		},
#endif

  /* POSIX.1 Configurable Pathname Values */
#ifdef _PC_LINK_MAX
  { "LINK_MAX",			PATHCONF,	_PC_LINK_MAX		},
#endif
#ifdef _PC_MAX_CANON
  { "MAX_CANON",		PATHCONF,	_PC_MAX_CANON		},
#endif
#ifdef _PC_MAX_INPUT
  { "MAX_INPUT",		PATHCONF,	_PC_MAX_INPUT		},
#endif
#ifdef _PC_NAME_MAX
  { "NAME_MAX",			PATHCONF,	_PC_NAME_MAX		},
#endif
#ifdef _PC_PATH_MAX
  { "PATH_MAX",			PATHCONF,	_PC_PATH_MAX		},
#endif
#ifdef _PC_PIPE_BUF
  { "PIPE_BUF",			PATHCONF,	_PC_PIPE_BUF		},
#endif
#ifdef _PC_SYMLINK_MAX
  { "SYMLINK_MAX",		PATHCONF,	_PC_SYMLINK_MAX		},
#endif
#ifdef _PC_CHOWN_RESTRICTED
  { "_POSIX_CHOWN_RESTRICTED",	PATHCONF,	_PC_CHOWN_RESTRICTED	},
#endif
#ifdef _PC_NO_TRUNC
  { "_POSIX_NO_TRUNC",		PATHCONF,	_PC_NO_TRUNC		},
#endif
#ifdef _PC_VDISABLE
  { "_POSIX_VDISABLE",		PATHCONF,	_PC_VDISABLE		},
#endif

  /* XPG 4.2 Configurable Pathname Values */
#if defined (_PC_FILESIZEBITS)
  { "FILESIZEBITS",		PATHCONF,	_PC_FILESIZEBITS },
#endif
#if defined (_PC_ASYNC_IO)
  { "_POSIX_ASYNC_IO",		PATHCONF,	_PC_ASYNC_IO },
#endif
#if defined (_PC_PRIO_IO)
  { "_POSIX_PRIO_IO",		PATHCONF,	_PC_PRIO_IO },
#endif
#if defined (_PC_SYNC_IO)
  { "_POSIX_SYNC_IO",		PATHCONF,	_PC_SYNC_IO },
#endif

  /* POSIX.1-200x configurable pathname values */
#if defined (_PC_ALLOC_SIZE_MIN)
  { "POSIX_ALLOC_SIZE_MIN",	PATHCONF,	_PC_ALLOC_SIZE_MIN },
  { "POSIX_REC_INCR_XFER_SIZE",	PATHCONF,	_PC_REC_INCR_XFER_SIZE },
  { "POSIX_REC_MAX_XFER_SIZE",	PATHCONF,	_PC_REC_MAX_XFER_SIZE },
  { "POSIX_REC_MIN_XFER_SIZE",	PATHCONF,	_PC_REC_MIN_XFER_SIZE },
  { "POSIX_REC_XFER_ALIGN",	PATHCONF,	_PC_REC_XFER_ALIGN },
#endif

  /* ANSI/ISO C, POSIX.1-200x, XPG 4.2 (and later) C language type limits. */
  { "CHAR_BIT",			CONSTANT,	CHAR_BIT	},
  { "CHAR_MAX",			CONSTANT,	CHAR_MAX	},
  { "CHAR_MIN",			CONSTANT,	CHAR_MIN	},
  { "INT_BIT",			CONSTANT,	INT_BIT		},
  { "INT_MAX",			CONSTANT,	INT_MAX		},
  { "INT_MIN",			CONSTANT,	INT_MIN		},
#ifdef LLONG_MAX
  { "LLONG_MAX",		LLCONST,	VAL_LLONG_MAX	},
  { "LLONG_MIN",		LLCONST,	VAL_LLONG_MIN	},
#endif
  { "LONG_BIT",			CONSTANT,	LONG_BIT	},
  { "LONG_MAX",			CONSTANT,	LONG_MAX	},
  { "LONG_MIN",			CONSTANT,	LONG_MIN	},
#ifdef MB_LEN_MAX
  { "MB_LEN_MAX",		CONSTANT,	MB_LEN_MAX	},
#endif
  { "SCHAR_MAX",		CONSTANT,	SCHAR_MAX	},
  { "SCHAR_MIN",		CONSTANT,	SCHAR_MIN	},
  { "SHRT_MAX",			CONSTANT,	SHRT_MAX	},
  { "SHRT_MIN",			CONSTANT,	SHRT_MIN	},
  { "SIZE_MAX",			CONSTANT,	SIZE_MAX	},
  { "SSIZE_MAX",		CONSTANT,	SSIZE_MAX	},
  { "UCHAR_MAX",		CONSTANT,	UCHAR_MAX	},
  { "UINT_MAX",			CONSTANT,	UINT_MAX	},
#ifdef ULLONG_MAX
  { "ULLONG_MAX",		LLCONST,	VAL_ULLONG_MAX	},
#endif
  { "ULONG_MAX",		CONSTANT,	ULONG_MAX	},
  { "USHRT_MAX",		CONSTANT,	USHRT_MAX	},
  { "WORD_BIT",			CONSTANT,	WORD_BIT	},

  { NULL }
};

static int num_getconf_variables = sizeof(conf_table) / sizeof(struct conf_variable) - 1;

extern char *this_command_name;
extern char **make_builtin_argv ();

static void getconf_help ();
static int getconf_print ();
static int getconf_one ();
static int getconf_all ();

int
getconf_builtin (list)
     WORD_LIST *list;
{
  int c, r, opt, aflag;
  char **v;

  aflag = 0;
  reset_internal_getopt();
  while ((opt = internal_getopt (list, "ahv:")) != -1) {
  	switch (opt) {
  	case 'a':
  		aflag = 1;
  		break;
  	case 'h':
  		getconf_help();
  		return(EXECUTION_SUCCESS);
  	case 'v':
  		break;		/* ignored */
  	default:
  		builtin_usage();
  		return(EX_USAGE);
  	}
  }
 
  list = loptend;
  if ((aflag == 0 && list == 0) || (aflag && list) || list_length(list) > 2) {
  	builtin_usage();
  	return(EX_USAGE);
  }

  r = aflag ? getconf_all() : getconf_one(list);

  return r;
}

static void
getconf_help()
{
	const struct conf_variable *cp;
	register int i, column;

	builtin_usage();
	printf("Acceptable variable names are:\n");
	for (cp = conf_table; cp->name != NULL; cp++) {
		if (cp->type == PATHCONF)
			printf("%s pathname\n", cp->name);
		else
			printf("%s\n", cp->name);
	}
}

static int
getconf_print(cp, vpath, all)
struct conf_variable *cp;
char *vpath;
int all;
{
	long val;
	char *sval;
	size_t slen;

	switch (cp->type) {
	case G_UNDEF:
		printf("undefined\n");
		break;

#ifdef LLONG_MAX
	case LLCONST:
		switch (cp->value) {
			default:
			case VAL_LLONG_MIN:
				printf ("%lld\n", LLONG_MIN);
				break;
			case VAL_LLONG_MAX:
				printf ("%lld\n", LLONG_MAX);
				break;
#  if (ULLONG_MAX != LLONG_MAX)
			case VAL_ULLONG_MAX:
				printf ("%llu\n", ULLONG_MAX);
				break;
#  endif
		}
		break;
#endif
	case CONSTANT:
		switch (cp->value) {
			case UCHAR_MAX:
			case USHRT_MAX:
			case UINT_MAX:
#if (ULONG_MAX != UINT_MAX)			
			case ULONG_MAX:
#endif
#if (SIZE_MAX != UINT_MAX) && (SIZE_MAX != ULONG_MAX)
			case SIZE_MAX:
#endif

				printf("%lu\n", cp->value);
				break;
			default:
				printf("%ld\n", cp->value);
				break;
		}
		break;

	case CONFSTR:
		errno = 0;
		slen = confstr (cp->value, (char *) 0, (size_t) 0);
		if (slen == 0) {
			if (errno != 0) {
				if (all)
					printf ("getconf: %s\n", strerror(errno));
				else
					builtin_error ("%s", strerror(errno));
			} else
				printf ("undefined\n");
			return (EXECUTION_FAILURE);
		}
		sval = xmalloc(slen);

		confstr(cp->value, sval, slen);
		printf("%s\n", sval);
		free(sval);
		break;

	case SYSCONF:
		errno = 0;
		if ((val = sysconf(cp->value)) == -1) {
			if (errno != 0) {
				if (all)
					printf("getconf: %s\n", strerror (errno));
				else
					builtin_error ("%s", strerror (errno));
				return (EXECUTION_FAILURE);
			}

			printf ("undefined\n");
		} else {
			printf("%ld\n", val);
		}
		break;

	case PATHCONF:
		errno = 0;
		if ((val = pathconf(vpath, cp->value)) == -1) {
			if (errno != 0) {
				if (all)
					printf("getconf: %s: %s\n", vpath, strerror (errno));
				else
					builtin_error ("%s: %s", vpath, strerror (errno));
				return (EXECUTION_FAILURE);
			}

			printf ("undefined\n");
		} else {
			printf ("%ld\n", val);
		}
		break;
	}

	return (ferror(stdout) ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}

static int
getconf_all()
{
	const struct conf_variable *cp;
	int ret;

	ret = EXECUTION_SUCCESS;
	for (cp = conf_table; cp->name != NULL; cp++) {
		printf("%-35s", cp->name);
		if (getconf_print(cp, "/", 1) == EXECUTION_FAILURE)
			ret = EXECUTION_FAILURE;
	}
	return ret;
}

static int
getconf_one(list)
	WORD_LIST *list;
{
	const struct conf_variable *cp;
	char *vname, *vpath;

	vname = list->word->word;
	vpath = (list->next && list->next->word) ? list->next->word->word
						 : (char *)NULL;

	for (cp = conf_table; cp->name != NULL; cp++) {
		if (strcmp(vname, cp->name) == 0)
			break;
	}
	if (cp->name == NULL) {
		builtin_error ("%s: unknown variable", vname);
		return (EXECUTION_FAILURE);
	}

	if (cp->type == PATHCONF) {
		if (list->next == 0) {
			builtin_usage();
			return(EX_USAGE);
		}
	} else {
		if (list->next) {
			builtin_usage();
			return(EX_USAGE);
		}
	}

	return (getconf_print(cp, vpath, 0));
}

static char *getconf_doc[] = {
	"Display values of system limits and options.",
	"",
	"getconf writes the current value of a configurable system limit or",
	"option variable to the standard output.",
	(char *)NULL
};

struct builtin getconf_struct = {
	"getconf",
	getconf_builtin,
	BUILTIN_ENABLED,
	getconf_doc,
	"getconf -[ah] or getconf [-v spec] sysvar or getconf [-v spec] pathvar pathname",
	0
};

#ifndef HAVE_CONFSTR
static size_t
confstr (name, buf, len)
     int name;
     char *buf;
     size_t len;
{
  switch (name)
    {
    case _CS_PATH:
      if (len > 0 && buf)
	{
          strncpy (buf, STANDARD_UTILS_PATH, len - 1);
          buf[len - 1] = '\0';
	}
      return (sizeof (STANDARD_UTILS_PATH) + 1);
    default:
      errno = EINVAL;
      return 0;
    }
}
#endif

#ifndef HAVE_SYSCONF
extern long get_clk_tck __P((void));

static long
sysconf (name)
     int name;
{
#  if defined (_POSIX_VERSION)
  switch (name)
    {
    case _SC_ARG_MAX:
      return _POSIX_ARG_MAX;
    case _SC_CHILD_MAX:
      return _POSIX_CHILD_MAX;
    case _SC_CLK_TCK:
      return get_clk_tck();
    case _SC_NGROUPS_MAX:
      return _POSIX_NGROUPS_MAX;
    case _SC_OPEN_MAX:
      return _POSIX_OPEN_MAX;
    case _SC_JOB_CONTROL:
      return _POSIX_JOB_CONTROL;
    case _SC_SAVED_IDS:
      return _POSIX_SAVED_IDS;
    case _SC_VERSION:
      return _POSIX_VERSION;
    case _SC_BC_BASE_MAX:
      return _POSIX2_BC_BASE_MAX;
    case _SC_BC_DIM_MAX:
      return _POSIX2_BC_DIM_MAX;
    case _SC_BC_SCALE_MAX:
      return  _POSIX2_BC_SCALE_MAX;
    case _SC_BC_STRING_MAX:
      return _POSIX2_BC_STRING_MAX;
    case _SC_COLL_WEIGHTS_MAX:
      return  -1;
    case _SC_EXPR_NEST_MAX:
      return _POSIX2_EXPR_NEST_MAX;
    case _SC_LINE_MAX:
      return _POSIX2_LINE_MAX;
    case _SC_RE_DUP_MAX:
      return _POSIX2_RE_DUP_MAX;
    case _SC_STREAM_MAX:
      return _POSIX_STREAM_MAX;
    case _SC_TZNAME_MAX:
      return _POSIX_TZNAME_MAX;
    default:
      errno = EINVAL;
      return -1;
    }
#else
  errno = EINVAL;
  return -1;
#endif
}
#endif

#ifndef HAVE_PATHCONF
static long
pathconf (path, name)
     const char *path;
     int name;
{
#if defined (_POSIX_VERSION)
  switch (name)
    {
    case _PC_LINK_MAX:
      return _POSIX_LINK_MAX;
    case _PC_MAX_CANON:
      return _POSIX_MAX_CANON;
    case _PC_MAX_INPUT:
      return _POSIX_MAX_INPUT;
    case _PC_NAME_MAX:
      return _POSIX_NAME_MAX;
    case _PC_PATH_MAX:
      return _POSIX_PATH_MAX;
    case _PC_PIPE_BUF:
      return _POSIX_PIPE_BUF;
    case _PC_CHOWN_RESTRICTED:
#ifdef _POSIX_CHOWN_RESTRICTED
      return _POSIX_CHOWN_RESTRICTED;
#else
      return -1;
#endif
    case _PC_NO_TRUNC:
#ifdef _POSIX_NO_TRUNC
      return _POSIX_NO_TRUNC;
#else
      return -1;
#endif
    case _PC_VDISABLE:
#ifdef _POSIX_VDISABLE
      return _POSIX_VDISABLE;
#else
      return -1;
#endif
    default:
      errno = EINVAL;
      return -1;
    }
#else
  errno = EINVAL;
  return -1;
#endif
}
#endif