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Diffstat (limited to 'gnulib-tests/test-inttostr.c')
| -rw-r--r-- | gnulib-tests/test-inttostr.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/gnulib-tests/test-inttostr.c b/gnulib-tests/test-inttostr.c new file mode 100644 index 0000000..bf305c1 --- /dev/null +++ b/gnulib-tests/test-inttostr.c @@ -0,0 +1,94 @@ +/* Test inttostr functions, and incidentally, INT_BUFSIZE_BOUND + Copyright (C) 2010-2022 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; +} |