coreutils-8.25HEADcoreutils-8.25master

1 files changed, 172 insertions, 0 deletions

diff --git a/src/getlimits.c b/src/getlimits.c
new file mode 100644
index 0000000..e49a658
--- /dev/null
+++ b/src/getlimits.c
@@ -0,0 +1,172 @@
+/* getlimits - print various platform dependent limits.
+   Copyright (C) 2008-2016 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady  */
+
+#include <config.h>             /* sets _FILE_OFFSET_BITS=64 etc. */
+#include <stdio.h>
+#include <sys/types.h>
+#include <float.h>
+
+#include "ftoastr.h"
+#include "system.h"
+#include "long-options.h"
+
+#define PROGRAM_NAME "getlimits"
+
+#define AUTHORS proper_name_utf8 ("Padraig Brady", "P\303\241draig Brady")
+
+#ifndef TIME_T_MAX
+# define TIME_T_MAX TYPE_MAXIMUM (time_t)
+#endif
+
+#ifndef TIME_T_MIN
+# define TIME_T_MIN TYPE_MINIMUM (time_t)
+#endif
+
+#ifndef SSIZE_MIN
+# define SSIZE_MIN TYPE_MINIMUM (ssize_t)
+#endif
+
+#ifndef PID_T_MIN
+# define PID_T_MIN TYPE_MINIMUM (pid_t)
+#endif
+
+/* These are not interesting to print.
+ * Instead of these defines it would be nice to be able to do
+ * #ifdef (TYPE##_MIN) in function macro below.  */
+#define SIZE_MIN 0
+#define UCHAR_MIN 0
+#define UINT_MIN 0
+#define ULONG_MIN 0
+#define UINTMAX_MIN 0
+#define UID_T_MIN 0
+#define GID_T_MIN 0
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("\
+Usage: %s\n\
+"), program_name);
+
+      fputs (_("\
+Output platform dependent limits in a format useful for shell scripts.\n\
+\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+/* Add one to the absolute value of the number whose textual
+   representation is BUF + 1.  Do this in-place, in the buffer.
+   Return a pointer to the result, which is normally BUF + 1, but is
+   BUF if the representation grew in size.  */
+static char const *
+decimal_absval_add_one (char *buf)
+{
+  bool negative = (buf[1] == '-');
+  char *absnum = buf + 1 + negative;
+  char *p = absnum + strlen (absnum);
+  absnum[-1] = '0';
+  while (*--p == '9')
+    *p = '0';
+  ++*p;
+  char *result = MIN (absnum, p);
+  if (negative)
+    *--result = '-';
+  return result;
+}
+
+#define PRINT_FLOATTYPE(N, T, FTOASTR, BUFSIZE)                         \
+static void                                                             \
+N (T x)                                                                 \
+{                                                                       \
+  char buf[BUFSIZE];                                                    \
+  FTOASTR (buf, sizeof buf, FTOASTR_LEFT_JUSTIFY, 0, x);                \
+  puts (buf);                                                           \
+}
+
+PRINT_FLOATTYPE (print_FLT, float, ftoastr, FLT_BUFSIZE_BOUND)
+PRINT_FLOATTYPE (print_DBL, double, dtoastr, DBL_BUFSIZE_BOUND)
+PRINT_FLOATTYPE (print_LDBL, long double, ldtoastr, LDBL_BUFSIZE_BOUND)
+
+int
+main (int argc, char **argv)
+{
+  char limit[1 + MAX (INT_BUFSIZE_BOUND (intmax_t),
+                      INT_BUFSIZE_BOUND (uintmax_t))];
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  initialize_exit_failure (EXIT_FAILURE);
+  atexit (close_stdout);
+
+  parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
+                      usage, AUTHORS, (char const *) NULL);
+
+#define print_int(TYPE)                                                  \
+  sprintf (limit + 1, "%"PRIuMAX, (uintmax_t) TYPE##_MAX);               \
+  printf (#TYPE"_MAX=%s\n", limit + 1);                                  \
+  printf (#TYPE"_OFLOW=%s\n", decimal_absval_add_one (limit));           \
+  if (TYPE##_MIN)                                                        \
+    {                                                                    \
+      sprintf (limit + 1, "%"PRIdMAX, (intmax_t) TYPE##_MIN);            \
+      printf (#TYPE"_MIN=%s\n", limit + 1);                              \
+      printf (#TYPE"_UFLOW=%s\n", decimal_absval_add_one (limit));       \
+    }
+
+#define print_float(TYPE)                                                \
+  printf (#TYPE"_MIN="); print_##TYPE (TYPE##_MIN);                      \
+  printf (#TYPE"_MAX="); print_##TYPE (TYPE##_MAX);
+
+  /* Variable sized ints */
+  print_int (CHAR);
+  print_int (SCHAR);
+  print_int (UCHAR);
+  print_int (SHRT);
+  print_int (INT);
+  print_int (UINT);
+  print_int (LONG);
+  print_int (ULONG);
+  print_int (SIZE);
+  print_int (SSIZE);
+  print_int (TIME_T);
+  print_int (UID_T);
+  print_int (GID_T);
+  print_int (PID_T);
+  print_int (OFF_T);
+  print_int (INTMAX);
+  print_int (UINTMAX);
+
+  /* Variable sized floats */
+  print_float (FLT);
+  print_float (DBL);
+  print_float (LDBL);
+
+  return EXIT_SUCCESS;
+}