Mercurial > gnulib
view tests/test-freadahead.c @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children | 5d9b82ca550a |
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/* Test of freadahead() function. Copyright (C) 2007-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by Bruno Haible <bruno@clisp.org>, 2007. */ #include <config.h> #include "freadahead.h" #include <stdlib.h> #include <unistd.h> #include "macros.h" int main (int argc, char **argv) { int nbytes = atoi (argv[1]); if (nbytes > 0) { void *buf = malloc (nbytes); ASSERT (fread (buf, 1, nbytes, stdin) == nbytes); } if (nbytes == 0) ASSERT (freadahead (stdin) == 0); else { if (lseek (0, 0, SEEK_CUR) == nbytes) /* An unbuffered stdio, such as BeOS or on uClibc compiled without __STDIO_BUFFERS. */ ASSERT (freadahead (stdin) == 0); else { /* Normal buffered stdio. */ size_t buffered; int c, c2; ASSERT (freadahead (stdin) != 0); buffered = freadahead (stdin); c = fgetc (stdin); ASSERT (freadahead (stdin) == buffered - 1); ungetc (c, stdin); ASSERT (freadahead (stdin) == buffered); c2 = fgetc (stdin); ASSERT (c2 == c); ASSERT (freadahead (stdin) == buffered - 1); c = '@'; ungetc (c, stdin); ASSERT (freadahead (stdin) == buffered); c2 = fgetc (stdin); ASSERT (c2 == c); ASSERT (freadahead (stdin) == buffered - 1); } } return 0; }