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+/* Test inttostr functions, and incidentally, INT_BUFSIZE_BOUND
+ Copyright (C) 2010-2021 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 <https://www.gnu.org/licenses/>. */
+
+/* Written by Jim Meyering. */
+
+#include <config.h>
+
+#include "inttostr.h"
+#include "intprops.h"
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "macros.h"
+
+#define STREQ(a, b) (strcmp (a, b) == 0)
+#define IS_TIGHT(T) (_GL_SIGNED_TYPE_OR_EXPR (T) == TYPE_SIGNED (T))
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
+
+/* Verify that an inttostr function works as advertised.
+ Convert maximum and minimum (per-type, T) values using both snprintf --
+ with a cast to intmax_t or uintmax_t -- and FN, and compare the
+ resulting strings. Use malloc for the inttostr buffer, so that if
+ we ever exceed the usually-tight INT_BUFSIZE_BOUND, tools like
+ valgrind will detect the failure. */
+#define CK(T, Fn) \
+ do \
+ { \
+ char ref[100]; \
+ char *buf = malloc (INT_BUFSIZE_BOUND (T)); \
+ char const *p; \
+ ASSERT (buf); \
+ *buf = '\0'; \
+ ASSERT \
+ ((TYPE_SIGNED (T) \
+ ? snprintf (ref, sizeof ref, "%jd", (intmax_t) TYPE_MINIMUM (T)) \
+ : snprintf (ref, sizeof ref, "%ju", (uintmax_t) TYPE_MINIMUM (T))) \
+ < sizeof ref); \
+ ASSERT (STREQ ((p = Fn (TYPE_MINIMUM (T), buf)), ref)); \
+ /* Ensure that INT_BUFSIZE_BOUND is tight for signed types. */ \
+ ASSERT (! TYPE_SIGNED (T) || (p == buf && *p == '-')); \
+ ASSERT \
+ ((TYPE_SIGNED (T) \
+ ? snprintf (ref, sizeof ref, "%jd", (intmax_t) TYPE_MAXIMUM (T)) \
+ : snprintf (ref, sizeof ref, "%ju", (uintmax_t) TYPE_MAXIMUM (T))) \
+ < sizeof ref); \
+ ASSERT (STREQ ((p = Fn (TYPE_MAXIMUM (T), buf)), ref)); \
+ /* For unsigned types, the bound is not always tight. */ \
+ ASSERT (! IS_TIGHT (T) || TYPE_SIGNED (T) \
+ || (p == buf && ISDIGIT (*p))); \
+ free (buf); \
+ } \
+ while (0)
+
+int
+main (void)
+{
+ size_t b_size = 2;
+ char *b = malloc (b_size);
+ ASSERT (b);
+
+ /* Ideally we would rely on the snprintf-posix module, in which case
+ this guard would not be required, but due to limitations in gnulib's
+ implementation (see modules/snprintf-posix), we cannot. */
+ if (snprintf (b, b_size, "%ju", (uintmax_t) 3) == 1
+ && b[0] == '3' && b[1] == '\0')
+ {
+ CK (int, inttostr);
+ CK (unsigned int, uinttostr);
+ CK (off_t, offtostr);
+ CK (uintmax_t, umaxtostr);
+ CK (intmax_t, imaxtostr);
+ free (b);
+ return 0;
+ }
+
+ /* snprintf doesn't accept %ju; skip this test. */
+ free (b);
+ return 77;
+}