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Diffstat (limited to 'string/test-Xnlen-nonarray.c')
| -rw-r--r-- | string/test-Xnlen-nonarray.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/string/test-Xnlen-nonarray.c b/string/test-Xnlen-nonarray.c new file mode 100644 index 0000000000..499bef2041 --- /dev/null +++ b/string/test-Xnlen-nonarray.c @@ -0,0 +1,133 @@ +/* Test non-array inputs to string length functions. + Copyright (C) 2024 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 + <https://www.gnu.org/licenses/>. */ + +/* This skeleton file is included from string/test-strnlen-nonarray.c + and wcsmbs/test-wcsnlen-nonarray.c to test that reading of the array + stops at the first null character. + + TEST_IDENTIFIER must be the test function identifier. TEST_NAME is + the same as a string. + + CHAR must be defined as the character type. */ + +#include <array_length.h> +#include <string.h> +#include <support/check.h> +#include <support/next_to_fault.h> +#include <support/test-driver.h> +#include <sys/param.h> +#include <unistd.h> + +typedef __typeof (TEST_IDENTIFIER) *proto_t; + +#define TEST_MAIN +#include "test-string.h" + +IMPL (TEST_IDENTIFIER, 1) + +static int +test_main (void) +{ + enum { buffer_length = 256 }; + TEST_VERIFY_EXIT (sysconf (_SC_PAGESIZE) >= buffer_length); + + test_init (); + + /* Buffer layout: There are a_count 'A' character followed by + zero_count null character, for a total of buffer_length + character: + + AAAAA...AAAAA 00000 ... 00000 (unmapped page follows) + \ / \ / + (a_count) (zero_count) + \___ (buffer_length) ___/ + ^ + | + start_offset + + The buffer length does not change, but a_count (and thus _zero) + and start_offset vary. + + If start_offset == buffer_length, only 0 is a valid length + argument. The result is 0. + + Otherwwise, if zero_count > 0 (if there a null characters in the + buffer), then any length argument is valid. If start_offset < + a_count (i.e., there is a non-null character at start_offset), the + result is the minimum of a_count - start_offset and the length + argument. Otherwise the result is 0. + + Otherwise, there are no null characters before the unmapped page. + The length argument must not be greater than buffer_length - + start_offset, and the result is the length argument. */ + + struct support_next_to_fault ntf + = support_next_to_fault_allocate (buffer_length * sizeof (CHAR)); + CHAR *buffer = (CHAR *) ntf.buffer; + + FOR_EACH_IMPL (impl, 0) + { + printf ("info: testing %s\n", impl->name); + for (size_t i = 0; i < buffer_length; ++i) + buffer[i] = 'A'; + + for (int zero_count = 0; zero_count <= buffer_length; ++zero_count) + { + if (zero_count > 0) + buffer[buffer_length - zero_count] = 0; + int a_count = buffer_length - zero_count; + for (int start_offset = 0; start_offset <= buffer_length; + ++start_offset) + { + CHAR *start_pointer = buffer + start_offset; + if (start_offset == buffer_length) + TEST_COMPARE (CALL (impl, buffer + start_offset, 0), 0); + else if (zero_count > 0) + for (int length_argument = 0; + length_argument <= 2 * buffer_length; + ++length_argument) + { + if (test_verbose) + printf ("zero_count=%d a_count=%d start_offset=%d" + " length_argument=%d\n", + zero_count, a_count, start_offset, + length_argument); + if (start_offset < a_count) + TEST_COMPARE (CALL (impl, start_pointer, length_argument), + MIN (a_count - start_offset, + length_argument)); + else + TEST_COMPARE (CALL (impl, start_pointer, length_argument), + 0); + } + else + for (int length_argument = 0; + length_argument <= buffer_length - start_offset; + ++length_argument) + TEST_COMPARE (CALL (impl, start_pointer, length_argument), + length_argument); + } + } + } + + support_next_to_fault_free (&ntf); + + return 0; +} + +#include <support/test-driver.c> |