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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Test writing differently sized strings to a memstream.
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Copyright (C) 2022-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xmemstream.h>
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/* Returns a printable ASCII character based on INDEX. */
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static inline char
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char_from_index (unsigned int index)
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{
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return ' ' + (index % 95);
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}
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enum { result_size = 25000 };
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static void
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run_one_size (unsigned int chunk_size)
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{
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char *chunk = xmalloc (chunk_size + 1);
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struct xmemstream mem;
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xopen_memstream (&mem);
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unsigned int written = 0;
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for (unsigned int i = 0; i < result_size; )
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{
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unsigned int to_print = result_size - i;
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if (to_print > chunk_size)
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to_print = chunk_size;
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for (unsigned int j = 0; j < to_print; ++j)
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chunk[j] = char_from_index(i + j);
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chunk[to_print] = '\0';
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fprintf (mem.out, "%s", chunk); /* Needs -fno-builtin-fprintf. */
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i += to_print;
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written += strlen(chunk);
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}
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xfclose_memstream (&mem);
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TEST_COMPARE (written, result_size);
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TEST_COMPARE (mem.length, result_size);
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TEST_COMPARE (strlen (mem.buffer), result_size);
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for (unsigned int i = 0; i < result_size; ++i)
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TEST_COMPARE (mem.buffer[i], char_from_index (i));
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free (mem.buffer);
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free (chunk);
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}
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static int
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do_test (void)
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{
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for (unsigned int chunk_size = 1; chunk_size <= 30; ++ chunk_size)
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run_one_size (chunk_size);
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return 0;
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}
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#include <support/test-driver.c>
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