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109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
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/* Test for BZ #27650, formatted input matching beyond INT_MAX.
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Copyright (C) 2024 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 <error.h>
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#include <errno.h>
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#include <limits.h>
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#include <mcheck.h>
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#include <stddef.h>
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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 <sys/types.h>
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#include <support/check.h>
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#include <support/test-driver.h>
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/* Produce a stream of more than INT_MAX characters via buffer BUF of
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size SIZE according to bookkeeping in COOKIE and then return EOF. */
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static ssize_t
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io_read (void *cookie, char *buf, size_t size)
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{
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unsigned int *written = cookie;
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unsigned int w = *written;
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if (w > INT_MAX)
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return 0;
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memset (buf, 'a', size);
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*written = w + size;
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return size;
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}
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/* Consume a stream of more than INT_MAX characters from an artificial
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input stream of which none is the new line character. The call to
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fscanf is supposed to complete upon the EOF condition of input,
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however in the presence of BZ #27650 it will terminate prematurely
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with characters still outstanding in input. Diagnose the condition
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and return status accordingly. */
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int
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do_test (void)
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{
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static cookie_io_functions_t io_funcs = { .read = io_read };
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unsigned int written = 0;
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FILE *in;
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int v;
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mtrace ();
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in = fopencookie (&written, "r", io_funcs);
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if (in == NULL)
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{
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FAIL ("fopencookie: %m");
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goto out;
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}
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v = fscanf (in, "%*[^\n]");
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if (ferror (in))
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{
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FAIL ("fscanf: input failure, at %u: %m", written);
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goto out_close;
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}
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else if (v == EOF)
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{
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FAIL ("fscanf: unexpected end of file, at %u", written);
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goto out_close;
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}
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if (!feof (in))
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{
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v = fgetc (in);
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if (ferror (in))
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FAIL ("fgetc: input failure: %m");
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else if (v == EOF)
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FAIL ("fgetc: unexpected end of file after missing end of file");
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else if (v == '\n')
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FAIL ("unexpected new line character received");
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else
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FAIL ("character received after end of file expected: \\x%02x", v);
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}
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out_close:
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if (fclose (in) != 0)
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FAIL ("fclose: %m");
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out:
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return EXIT_SUCCESS;
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}
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#define TIMEOUT (DEFAULT_TIMEOUT * 8)
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#include <support/test-driver.c>
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