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Diffstat (limited to 'string/test-Xncmp-nonarray.c')
| -rw-r--r-- | string/test-Xncmp-nonarray.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/string/test-Xncmp-nonarray.c b/string/test-Xncmp-nonarray.c new file mode 100644 index 0000000000..9f3a3ca75d --- /dev/null +++ b/string/test-Xncmp-nonarray.c @@ -0,0 +1,183 @@ +/* Test non-array inputs to string comparison 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-strncmp-nonarray.c and + wcsmbs/test-wcsncmp-nonarray.c to test that reading of the arrays 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> + +/* Much shorter than test-Xnlen-nonarray.c because of deeply nested loops. */ +enum { buffer_length = 80 }; + +/* The test buffer layout follows what is described test-Xnlen-nonarray.c, + except that there two buffers, left and right. The variables + a_count, zero_count, start_offset are all duplicated. */ + +/* Return the maximum string length for a string that starts at + start_offset. */ +static int +string_length (int a_count, int start_offset) +{ + if (start_offset == buffer_length || start_offset >= a_count) + return 0; + else + return a_count - start_offset; +} + +/* This is the valid maximum length argument computation for + strnlen/wcsnlen. See text-Xnlen-nonarray.c. */ +static int +maximum_length (int start_offset, int zero_count) +{ + if (start_offset == buffer_length) + return 0; + else if (zero_count > 0) + /* Effectively unbounded, but we need to stop fairly low, + otherwise testing takes too long. */ + return buffer_length + 32; + else + return buffer_length - start_offset; +} + +typedef __typeof (TEST_IDENTIFIER) *proto_t; + +#define TEST_MAIN +#include "test-string.h" + +IMPL (TEST_IDENTIFIER, 1) + +static int +test_main (void) +{ + TEST_VERIFY_EXIT (sysconf (_SC_PAGESIZE) >= buffer_length); + test_init (); + + struct support_next_to_fault left_ntf + = support_next_to_fault_allocate (buffer_length * sizeof (CHAR)); + CHAR *left_buffer = (CHAR *) left_ntf.buffer; + struct support_next_to_fault right_ntf + = support_next_to_fault_allocate (buffer_length * sizeof (CHAR)); + CHAR *right_buffer = (CHAR *) right_ntf.buffer; + + FOR_EACH_IMPL (impl, 0) + { + printf ("info: testing %s\n", impl->name); + for (size_t i = 0; i < buffer_length; ++i) + left_buffer[i] = 'A'; + + for (int left_zero_count = 0; left_zero_count <= buffer_length; + ++left_zero_count) + { + if (left_zero_count > 0) + left_buffer[buffer_length - left_zero_count] = 0; + int left_a_count = buffer_length - left_zero_count; + for (size_t i = 0; i < buffer_length; ++i) + right_buffer[i] = 'A'; + for (int right_zero_count = 0; right_zero_count <= buffer_length; + ++right_zero_count) + { + if (right_zero_count > 0) + right_buffer[buffer_length - right_zero_count] = 0; + int right_a_count = buffer_length - right_zero_count; + for (int left_start_offset = 0; + left_start_offset <= buffer_length; + ++left_start_offset) + { + CHAR *left_start_pointer = left_buffer + left_start_offset; + int left_maxlen + = maximum_length (left_start_offset, left_zero_count); + int left_length + = string_length (left_a_count, left_start_offset); + for (int right_start_offset = 0; + right_start_offset <= buffer_length; + ++right_start_offset) + { + CHAR *right_start_pointer + = right_buffer + right_start_offset; + int right_maxlen + = maximum_length (right_start_offset, right_zero_count); + int right_length + = string_length (right_a_count, right_start_offset); + + /* Maximum length is modelled after strnlen/wcsnlen, + and must be valid for both pointer arguments at + the same time. */ + int maxlen = MIN (left_maxlen, right_maxlen); + + for (int length_argument = 0; length_argument <= maxlen; + ++length_argument) + { + if (test_verbose) + { + printf ("left: zero_count=%d" + " a_count=%d start_offset=%d\n", + left_zero_count, left_a_count, + left_start_offset); + printf ("right: zero_count=%d" + " a_count=%d start_offset=%d\n", + right_zero_count, right_a_count, + right_start_offset); + printf ("length argument: %d\n", + length_argument); + } + + /* Effective lengths bounded by length argument. + The effective length determines the + outcome of the comparison. */ + int left_effective + = MIN (left_length, length_argument); + int right_effective + = MIN (right_length, length_argument); + if (left_effective == right_effective) + TEST_COMPARE (CALL (impl, + left_start_pointer, + right_start_pointer, + length_argument), 0); + else if (left_effective < right_effective) + TEST_COMPARE (CALL (impl, + left_start_pointer, + right_start_pointer, + length_argument) < 0, 1); + else + TEST_COMPARE (CALL (impl, + left_start_pointer, + right_start_pointer, + length_argument) > 0, 1); + } + } + } + } + } + } + + return 0; +} + +#include <support/test-driver.c> |