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95 lines
4.1 KiB
C
95 lines
4.1 KiB
C
/* Test inttostr functions, and incidentally, INT_BUFSIZE_BOUND
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Copyright (C) 2010-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering. */
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#include <config.h>
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#include "inttostr.h"
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#include "intprops.h"
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "macros.h"
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#define STREQ(a, b) (strcmp (a, b) == 0)
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#define IS_TIGHT(T) (_GL_SIGNED_TYPE_OR_EXPR (T) == TYPE_SIGNED (T))
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#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
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/* Verify that an inttostr function works as advertised.
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Convert maximum and minimum (per-type, T) values using both snprintf --
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with a cast to intmax_t or uintmax_t -- and FN, and compare the
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resulting strings. Use malloc for the inttostr buffer, so that if
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we ever exceed the usually-tight INT_BUFSIZE_BOUND, tools like
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valgrind will detect the failure. */
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#define CK(T, Fn) \
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do \
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{ \
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char ref[100]; \
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char *buf = malloc (INT_BUFSIZE_BOUND (T)); \
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char const *p; \
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ASSERT (buf); \
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*buf = '\0'; \
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ASSERT \
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((TYPE_SIGNED (T) \
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? snprintf (ref, sizeof ref, "%jd", (intmax_t) TYPE_MINIMUM (T)) \
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: snprintf (ref, sizeof ref, "%ju", (uintmax_t) TYPE_MINIMUM (T))) \
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< sizeof ref); \
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ASSERT (STREQ ((p = Fn (TYPE_MINIMUM (T), buf)), ref)); \
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/* Ensure that INT_BUFSIZE_BOUND is tight for signed types. */ \
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ASSERT (! TYPE_SIGNED (T) || (p == buf && *p == '-')); \
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ASSERT \
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((TYPE_SIGNED (T) \
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? snprintf (ref, sizeof ref, "%jd", (intmax_t) TYPE_MAXIMUM (T)) \
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: snprintf (ref, sizeof ref, "%ju", (uintmax_t) TYPE_MAXIMUM (T))) \
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< sizeof ref); \
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ASSERT (STREQ ((p = Fn (TYPE_MAXIMUM (T), buf)), ref)); \
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/* For unsigned types, the bound is not always tight. */ \
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ASSERT (! IS_TIGHT (T) || TYPE_SIGNED (T) \
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|| (p == buf && ISDIGIT (*p))); \
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free (buf); \
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} \
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while (0)
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int
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main (void)
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{
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size_t b_size = 2;
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char *b = malloc (b_size);
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ASSERT (b);
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/* Ideally we would rely on the snprintf-posix module, in which case
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this guard would not be required, but due to limitations in gnulib's
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implementation (see modules/snprintf-posix), we cannot. */
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if (snprintf (b, b_size, "%ju", (uintmax_t) 3) == 1
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&& b[0] == '3' && b[1] == '\0')
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{
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CK (int, inttostr);
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CK (unsigned int, uinttostr);
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CK (off_t, offtostr);
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CK (uintmax_t, umaxtostr);
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CK (intmax_t, imaxtostr);
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free (b);
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return 0;
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}
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/* snprintf doesn't accept %ju; skip this test. */
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free (b);
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return 77;
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}
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