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103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/* Test the sprintf (buf, "%s", buf) does not override buf.
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Copyright (C) 2019-2020 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 <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <support/check.h>
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enum
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{
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FUNCTION_FIRST,
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FUNCTION_SPRINTF = FUNCTION_FIRST,
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FUNCTION_SNPRINF,
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FUNCTION_VSPRINTF,
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FUNCTION_VSNPRINTF,
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FUNCTION_LAST
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};
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static void
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do_one_test (int function, char *buf, ...)
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{
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va_list args;
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char *arg;
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/* Expected results for fortified and non-fortified sprintf. */
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#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 1
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const char *expected = "CD";
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#else
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const char *expected = "ABCD";
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#endif
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va_start (args, buf);
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arg = va_arg (args, char *);
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va_end (args);
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switch (function)
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{
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/* The regular sprintf and vsprintf functions do not override the
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destination buffer, even if source and destination overlap. */
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case FUNCTION_SPRINTF:
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sprintf (buf, "%sCD", buf);
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TEST_COMPARE_STRING (buf, expected);
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break;
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case FUNCTION_VSPRINTF:
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va_start (args, buf);
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vsprintf (arg, "%sCD", args);
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TEST_COMPARE_STRING (arg, expected);
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va_end (args);
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break;
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/* On the other hand, snprint and vsnprint override overlapping
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source and destination buffers. */
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case FUNCTION_SNPRINF:
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snprintf (buf, 3, "%sCD", buf);
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TEST_COMPARE_STRING (buf, "CD");
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break;
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case FUNCTION_VSNPRINTF:
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va_start (args, buf);
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vsnprintf (arg, 3, "%sCD", args);
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TEST_COMPARE_STRING (arg, "CD");
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va_end (args);
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break;
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default:
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support_record_failure ();
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}
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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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char buf[8];
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int i;
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/* For each function in the enum do:
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- reset the buffer to the initial state "AB";
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- call the function with buffer as source and destination;
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- check for the desired behavior. */
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for (i = FUNCTION_FIRST; i < FUNCTION_LAST; i++)
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{
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strncpy (buf, "AB", 3);
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do_one_test (i, buf, buf);
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}
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return 0;
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}
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#include <support/test-driver.c>
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