/* Test of freadahead() function. Copyright (C) 2007-2017 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 . */ /* Written by Bruno Haible , 2007. */ #include #include "freadahead.h" #include #include #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; }