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Diffstat (limited to 'string/tst-cmp.c')
| -rw-r--r-- | string/tst-cmp.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/string/tst-cmp.c b/string/tst-cmp.c new file mode 100644 index 0000000000..a358477007 --- /dev/null +++ b/string/tst-cmp.c @@ -0,0 +1,212 @@ +/* Alignment/padding coverage test for string comparison. + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* This performs test comparisons with various (mis)alignments and + characters in the padding. It is partly a regression test for bug + 20327. */ + +#include <limits.h> +#include <malloc.h> +#include <stdbool.h> +#include <stdlib.h> +#include <string.h> + +static int +signum (int val) +{ + if (val < 0) + return -1; + if (val > 0) + return 1; + else + return 0; +} + +static size_t +max_size_t (size_t left, size_t right) +{ + if (left > right) + return left; + else + return right; +} + +/* Wrappers for strncmp and strncasecmp which determine the maximum + string length in some, either based on the input string length, or + using fixed constants. */ + +static int +strncmp_no_terminator (const char *left, const char *right) +{ + size_t left_len = strlen (left); + size_t right_len = strlen (right); + return strncmp (left, right, max_size_t (left_len, right_len)); +} + +static int +strncasecmp_no_terminator (const char *left, const char *right) +{ + size_t left_len = strlen (left); + size_t right_len = strlen (right); + return strncasecmp (left, right, max_size_t (left_len, right_len)); +} + +static int +strncmp_terminator (const char *left, const char *right) +{ + size_t left_len = strlen (left); + size_t right_len = strlen (right); + return strncmp (left, right, max_size_t (left_len, right_len)); +} + +static int +strncasecmp_terminator (const char *left, const char *right) +{ + size_t left_len = strlen (left); + size_t right_len = strlen (right); + return strncasecmp (left, right, max_size_t (left_len, right_len)); +} + +static int +strncmp_64 (const char *left, const char *right) +{ + return strncmp (left, right, 64); +} + +static int +strncasecmp_64 (const char *left, const char *right) +{ + return strncasecmp (left, right, 64); +} + +static int +strncmp_max (const char *left, const char *right) +{ + return strncmp (left, right, SIZE_MAX); +} + +static int +strncasecmp_max (const char *left, const char *right) +{ + return strncasecmp (left, right, SIZE_MAX); +} + +static int +do_test (void) +{ + enum { + max_align = 64, + max_string_length = 33 + }; + size_t blob_size = max_align + max_string_length + 1; + char *left = memalign (max_align, blob_size); + char *right = memalign (max_align, blob_size); + if (left == NULL || right == NULL) + { + printf ("error: out of memory\n"); + return 1; + } + + const struct + { + const char *name; + int (*implementation) (const char *, const char *); + } functions[] = + { + { "strcmp", strcmp }, + { "strcasecmp", strcasecmp }, + { "strncmp (without NUL)", strncmp_no_terminator}, + { "strncasecmp (without NUL)", strncasecmp_no_terminator}, + { "strncmp (with NUL)", strncmp_terminator}, + { "strncasecmp (with NUL)", strncasecmp_terminator}, + { "strncmp (length 64)", strncmp_64}, + { "strncasecmp (length 64)", strncasecmp_64}, + { "strncmp (length SIZE_MAX)", strncmp_max}, + { "strncasecmp (length SIZE_MAX)", strncasecmp_max}, + { NULL, NULL } + }; + const char *const strings[] = + { + "", + "0", + "01", + "01234567", + "0123456789abcde", + "0123456789abcdef", + "0123456789abcdefg", + "1", + "10", + "123456789abcdef", + "123456789abcdefg", + "23456789abcdef", + "23456789abcdefg", + "abcdefghijklmnopqrstuvwxyzABCDEF", + NULL + }; + const unsigned char pads[] = + { 0, 1, 32, 64, 128, '0', '1', 'e', 'f', 'g', 127, 192, 255 }; + + bool errors = false; + for (int left_idx = 0; strings[left_idx] != NULL; ++left_idx) + for (int left_align = 0; left_align < max_align; ++left_align) + for (unsigned pad_left = 0; pad_left < sizeof (pads); ++pad_left) + { + memset (left, pads[pad_left], blob_size); + strcpy (left + left_align, strings[left_idx]); + + for (int right_idx = 0; strings[right_idx] != NULL; ++right_idx) + for (unsigned pad_right = 0; pad_right < sizeof (pads); + ++pad_right) + for (int right_align = 0; right_align < max_align; + ++right_align) + { + memset (right, pads[pad_right], blob_size); + strcpy (right + right_align, strings[right_idx]); + + for (int func = 0; functions[func].name != NULL; ++func) + { + int expected = left_idx - right_idx; + int actual = functions[func].implementation + (left + left_align, right + right_align); + if (signum (actual) != signum (expected)) + { + printf ("error: mismatch for %s: %d\n" + " left: \"%s\"\n" + " right: \"%s\"\n" + " pad_left = %u, pad_right = %u,\n" + " left_align = %d, right_align = %d\n", + functions[func].name, actual, + strings[left_idx], strings[right_idx], + pad_left, pad_right, + left_align, right_align); + errors = true; + } + } + } + } + free (right); + free (left); + return errors; +} + +/* The nested loops need a long time to complete on slower + machines. */ +#define TIMEOUT 300 + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |