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Diffstat (limited to 'string/test-strndup.c')
| -rw-r--r-- | string/test-strndup.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/string/test-strndup.c b/string/test-strndup.c new file mode 100644 index 0000000000..7be0284e1c --- /dev/null +++ b/string/test-strndup.c @@ -0,0 +1,200 @@ +/* Test strndup functions. + Copyright (C) 2023 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/>. */ + +#include <support/check.h> + +#define TEST_MAIN +#include "test-string.h" + +static void +do_one_test (const char *src, size_t len, size_t n) +{ + char *dst = strndup (src, n); + size_t s = (len > n ? n: len) * sizeof (char); + + TEST_COMPARE_BLOB (dst, s, src, s); + + free (dst); +} + +static void +do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char) +{ + size_t i; + char *s1; + + align1 &= 7; + if ((align1 + len) * sizeof (char) >= page_size) + return; + + align2 &= 7; + if ((align2 + len) * sizeof (char) >= page_size) + return; + + s1 = (char *) (buf1) + align1; + + for (i = 0; i < len; ++i) + s1[i] = 32 + 23 * i % (max_char - 32); + s1[len] = 0; + for (i = len + 1; (i + align1) * sizeof (char) < page_size && i < len + 64; + ++i) + s1[i] = 32 + 32 * i % (max_char - 32); + + do_one_test (s1, len, n); +} + +static void +do_page_tests (void) +{ + char *s1; + const size_t maxoffset = 64; + + /* Put s1 at the maxoffset from the edge of buf1's last page. */ + s1 = (char *) buf1 + BUF1PAGES * page_size / sizeof (char) - maxoffset; + + memset (s1, 'a', maxoffset - 1); + s1[maxoffset - 1] = '\0'; + + /* Both strings are bounded to a page with read/write access and the next + page is protected with PROT_NONE (meaning that any access outside of the + page regions will trigger an invalid memory access). + + The loop copies the string s1 for all possible offsets up to maxoffset + for both inputs with a size larger than s1 (so memory access outside the + expected memory regions might trigger invalid access). */ + + for (size_t off1 = 0; off1 < maxoffset; off1++) + for (size_t off2 = 0; off2 < maxoffset; off2++) + do_one_test (s1 + off1, maxoffset - off1 - 1, + maxoffset + (maxoffset - off2)); +} + +static void +do_random_tests (void) +{ + size_t i, j, n, align1, align2, len, size, mode; + char *p1 = (char *) (buf1 + page_size) - 512; + char *res; + + for (n = 0; n < ITERATIONS; n++) + { + mode = random (); + if (mode & 1) + { + size = random () & 255; + align1 = 512 - size - (random () & 15); + if (mode & 2) + align2 = align1 - (random () & 24); + else + align2 = align1 - (random () & 31); + if (mode & 4) + { + j = align1; + align1 = align2; + align2 = j; + } + if (mode & 8) + len = size - (random () & 31); + else + len = 512; + if (len >= 512) + len = random () & 511; + } + else + { + align1 = random () & 31; + if (mode & 2) + align2 = random () & 31; + else + align2 = align1 + (random () & 24); + len = random () & 511; + j = align1; + if (align2 > j) + j = align2; + if (mode & 4) + { + size = random () & 511; + if (size + j > 512) + size = 512 - j - (random () & 31); + } + else + size = 512 - j; + if ((mode & 8) && len + j >= 512) + len = 512 - j - (random () & 7); + } + j = len + align1 + 64; + if (j > 512) + j = 512; + for (i = 0; i < j; i++) + { + if (i == len + align1) + p1[i] = 0; + else + { + p1[i] = random () & CHAR_MAX; + if (i >= align1 && i < len + align1 && !p1[i]) + p1[i] = (random () & 127) + 3; + } + } + + res = (char *) strndup ((char *) (p1 + align1), size); + j = len + 1; + if (size < j) + j = size; + TEST_COMPARE_BLOB (res, j, (char *) (p1 + align1), j); + free (res); + } +} + +int +test_main (void) +{ + size_t i; + + test_init (); + + printf ("%28s", ""); + printf ("\t%s", "strndup"); + putchar ('\n'); + + for (i = 1; i < 8; ++i) + { + do_test (i, i, 16, 16, 127); + do_test (i, i, 16, 16, CHAR_MAX); + do_test (i, 2 * i, 16, 16, 127); + do_test (2 * i, i, 16, 16, CHAR_MAX); + do_test (8 - i, 2 * i, 1 << i, 2 << i, 127); + do_test (2 * i, 8 - i, 2 << i, 1 << i, 127); + do_test (8 - i, 2 * i, 1 << i, 2 << i, CHAR_MAX); + do_test (2 * i, 8 - i, 2 << i, 1 << i, CHAR_MAX); + } + + for (i = 1; i < 8; ++i) + { + do_test (0, 0, 4 << i, 8 << i, 127); + do_test (0, 0, 16 << i, 8 << i, 127); + do_test (8 - i, 2 * i, 4 << i, 8 << i, 127); + do_test (8 - i, 2 * i, 16 << i, 8 << i, 127); + } + + do_random_tests (); + do_page_tests (); + return ret; +} + +#include <support/test-driver.c> |