/* Copyright (C) 1991, 92, 95, 96, 97, 98 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <errno.h> #include <stdio.h> #include <string.h> #define default_func __default_room_functions.__input /* Read NMEMB chunks of SIZE bytes each from STREAM into P. */ size_t fread (p, size, nmemb, stream) void *p; size_t size; size_t nmemb; register FILE *stream; { register char *ptr = (char *) p; register size_t to_read = size * nmemb; size_t bytes = to_read; if (!__validfp (stream) || !stream->__mode.__read) { __set_errno (EINVAL); return 0; } if (feof (stream) || ferror (stream)) return 0; if (p == NULL || to_read == 0) return 0; if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back) { /* This stream has never been seen before, or it has a character pushed back. Call __fillbf to deal with those cases. Life will be simpler after this call. */ int c = __fillbf (stream); if (c == EOF) return 0; *ptr++ = c; if (--to_read == 0) return 1; } read_from_buffer:; if (stream->__bufp < stream->__get_limit) { /* First off, empty out the buffer. */ register size_t copy = stream->__get_limit - stream->__bufp; if (copy > to_read) copy = to_read; to_read -= copy; if (copy > 20) memcpy((void *) ptr, (void *) stream->__bufp, copy); else { register size_t i; for (i = 0; i < copy; ++i) ptr[i] = stream->__bufp[i]; } stream->__bufp += copy; if (to_read == 0) return nmemb; ptr += copy; } /* Reading directly into the user's buffer doesn't help when using a user-specified input buffer filling/expanding function, so we don't do it in that case. */ if (to_read >= stream->__bufsize && stream->__room_funcs.__input == default_func && stream->__offset == stream->__target) { /* Read directly into the user's buffer. */ if (stream->__io_funcs.__read != NULL) while (to_read > 0) { register int count; count = (*stream->__io_funcs.__read) (stream->__cookie, ptr, to_read); if (count > 0) { to_read -= count; if (stream->__offset != -1) { stream->__offset += count; stream->__target += count; } ptr += count; } else if (count == 0) { stream->__eof = 1; break; } else { stream->__error = 1; break; } } else stream->__eof = 1; } else { int c = __fillbf (stream); if (c == EOF) return (bytes - to_read) / size; *ptr++ = (char) c; --to_read; if (to_read > 0) goto read_from_buffer; } return (bytes - to_read) / size; } weak_alias (fread, fread_unlocked)