Re: [PATCH] Add getlimits utility for use in tests

[Pádraig Brady]

Take 4 attached

>From 54322f168c42cd7f4bb4f62081a4866d18598a41 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?P=C3=A1draig=20Brady?= <address@hidden>
Date: Thu, 20 Nov 2008 11:02:15 +0000
Subject: [PATCH] Add getlimits utility for use in tests

* src/getlimits.c: A utility to print
platform dependent limits in a format
suitable for use in shell scripts.
* src/Makefile.am: Add getlimits to list
of utilities to build but not install.
Also add it to the list linked with libiconv
* po/POTFILES.in: Add getlimits to translation list.
---
 po/POTFILES.in  |    1 +
 src/Makefile.am |    4 +-
 src/getlimits.c |  180 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 184 insertions(+), 1 deletions(-)
 create mode 100644 src/getlimits.c

diff --git a/po/POTFILES.in b/po/POTFILES.in
index 8a6e541..9bd8c43 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -62,6 +62,7 @@ src/factor.c
 src/false.c
 src/fmt.c
 src/fold.c
+src/getlimits.c
 src/group-list.c
 src/groups.c
 src/head.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 097cc7a..a6bc229 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -44,7 +44,7 @@ EXTRA_PROGRAMS = \
 
 bin_PROGRAMS = $(OPTIONAL_BIN_PROGS)
 
-noinst_PROGRAMS = setuidgid
+noinst_PROGRAMS = setuidgid getlimits
 
 noinst_HEADERS = \
   chown-core.h \
@@ -82,6 +82,7 @@ LDADD = libver.a ../lib/libcoreutils.a $(LIBINTL) 
../lib/libcoreutils.a
 cat_LDADD = $(LDADD)
 df_LDADD = $(LDADD)
 du_LDADD = $(LDADD)
+getlimits_LDADD = $(LDADD)
 ptx_LDADD = $(LDADD)
 split_LDADD = $(LDADD)
 timeout_LDADD = $(LDADD)
@@ -160,6 +161,7 @@ cat_LDADD += $(LIBICONV)
 cp_LDADD += $(LIBICONV)
 df_LDADD += $(LIBICONV)
 du_LDADD += $(LIBICONV)
+getlimits_LDADD += $(LIBICONV)
 ptx_LDADD += $(LIBICONV)
 split_LDADD += $(LIBICONV)
 timeout_LDADD += $(LIBICONV)
diff --git a/src/getlimits.c b/src/getlimits.c
new file mode 100644
index 0000000..7b4c3be
--- /dev/null
+++ b/src/getlimits.c
@@ -0,0 +1,180 @@
+/* getlimits - print various platform dependent limits.
+   Copyright (C) 2008 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 "system.h"
+#include "c-ctype.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
+
+static void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    fprintf (stderr, _("Try `%s --help' for more information.\n"),
+             program_name);
+  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_bug_reporting_address ();
+    }
+  exit (status);
+}
+
+/* Add absolute values of ascii decimal strings.
+ * Strings can have leading spaces.
+ * If any string has a '-' it's preserved in the output:
+ * I.E.
+ *    1 +  1 ->  2
+ *   -1 + -1 -> -2
+ *   -1 +  1 -> -2
+ *    1 + -1 -> -2
+ */
+static char *
+decimal_ascii_add (const char *str1, const char *str2)
+{
+  int len1 = strlen (str1);
+  int len2 = strlen (str2);
+  int rlen = MAX (len1, len2) + 3;  /* space for extra digit or sign + NUL */
+  char *result = xmalloc (rlen);
+  char *rp = result + rlen - 1;
+  const char *d1 = str1 + len1 - 1;
+  const char *d2 = str2 + len2 - 1;
+  int carry = 0;
+  *rp = '\0';
+
+  while (1)
+    {
+      char c1 = (d1 < str1 ? ' ' : (*d1 == '-' ? ' ' : *d1--));
+      char c2 = (d2 < str2 ? ' ' : (*d2 == '-' ? ' ' : *d2--));
+      char t1 = c1 + c2 + carry;    /* ASCII digits are BCD */
+      if (!c_isdigit (c1) && !c_isdigit (c2) && !carry)
+        break;
+      carry = t1 > '0' + '9' || t1 == ' ' + '9' + 1;
+      t1 += 6 * carry;
+      *--rp = (t1 & 0x0F) | 0x30;   /* top nibble to ASCII */
+    }
+  if ((d1 >= str1 && *d1 == '-') || (d2 >= str2 && (*d2 == '-')))
+    *--rp = '-';
+
+  if (rp != result)
+    memmove (result, rp, rlen - 1);
+
+  return result;
+}
+
+int
+main (int argc, char **argv)
+{
+  char limit[64];               /* big enough for 128 bit at least */
+  char *oflow;
+
+  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)                                                  \
+  snprintf (limit, sizeof(limit), "%"PRIuMAX, (uintmax_t)TYPE##_MAX);    \
+  printf (#TYPE"_MAX=%s\n", limit);                                      \
+  oflow = decimal_ascii_add(limit, "1");                                 \
+  printf (#TYPE"_OFLOW=%s\n", oflow);                                    \
+  free (oflow);                                                          \
+  if (TYPE##_MIN)                                                        \
+    {                                                                    \
+      snprintf (limit, sizeof(limit), "%"PRIdMAX, (intmax_t)TYPE##_MIN); \
+      printf (#TYPE"_MIN=%s\n", limit);                                  \
+      oflow = decimal_ascii_add (limit, "-1");                           \
+      printf (#TYPE"_UFLOW=%s\n", oflow);                                \
+      free (oflow);                                                      \
+    }
+
+  /* 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);
+}
+
+/*
+ * Local variables:
+ *  indent-tabs-mode: nil
+ * End:
+ */
-- 
1.5.3.6