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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 ``` ``````/* Truncate argument to nearest integral value not larger than the argument. Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #include "math_private.h" double trunc (double x) { int32_t i0, j0; u_int32_t i1; int sx; EXTRACT_WORDS (i0, i1, x); sx = i0 & 0x80000000; j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; if (j0 < 20) { if (j0 < 0) /* The magnitude of the number is < 1 so the result is +-0. */ INSERT_WORDS (x, sx, 0); else INSERT_WORDS (x, sx | (i0 & ~(0x000fffff >> j0)), 0); } else if (j0 > 51) { if (j0 == 0x400) /* x is inf or NaN. */ return x + x; } else { INSERT_WORDS (x, i0, i1 & ~(0xffffffffu >> (j0 - 20))); } return x; } libm_hidden_def(trunc) ``````