projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 1991-2019 Free Software Foundation, Inc. |
| ebbad4cc | 2 | This file is part of the GNU C Library. |
| 28f540f4 | 3 | |
| ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 28f540f4 | 8 | |
| ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 28f540f4 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 28f540f4 | 17 | |
| 28f540f4 RM |
18 | #include <string.h> |
| 19 | #include <memcopy.h> | |
| 20 | ||
| 92f1da4d UD |
21 | #undef memset |
| 22 | ||
| ebbad4cc | 23 | void * |
| 85c2e611 | 24 | inhibit_loop_to_libcall |
| 9d46370c | 25 | memset (void *dstpp, int c, size_t len) |
| 28f540f4 RM |
26 | { |
| 27 | long int dstp = (long int) dstpp; | |
| 28 | ||
| 29 | if (len >= 8) | |
| 30 | { | |
| 31 | size_t xlen; | |
| 32 | op_t cccc; | |
| 33 | ||
| 34 | cccc = (unsigned char) c; | |
| 35 | cccc |= cccc << 8; | |
| 36 | cccc |= cccc << 16; | |
| 37 | if (OPSIZ > 4) | |
| dfd2257a UD |
38 | /* Do the shift in two steps to avoid warning if long has 32 bits. */ |
| 39 | cccc |= (cccc << 16) << 16; | |
| 28f540f4 RM |
40 | |
| 41 | /* There are at least some bytes to set. | |
| 42 | No need to test for LEN == 0 in this alignment loop. */ | |
| 43 | while (dstp % OPSIZ != 0) | |
| 44 | { | |
| 45 | ((byte *) dstp)[0] = c; | |
| 46 | dstp += 1; | |
| 47 | len -= 1; | |
| 48 | } | |
| 49 | ||
| 50 | /* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */ | |
| 51 | xlen = len / (OPSIZ * 8); | |
| 52 | while (xlen > 0) | |
| 53 | { | |
| 54 | ((op_t *) dstp)[0] = cccc; | |
| 55 | ((op_t *) dstp)[1] = cccc; | |
| 56 | ((op_t *) dstp)[2] = cccc; | |
| 57 | ((op_t *) dstp)[3] = cccc; | |
| 58 | ((op_t *) dstp)[4] = cccc; | |
| 59 | ((op_t *) dstp)[5] = cccc; | |
| 60 | ((op_t *) dstp)[6] = cccc; | |
| 61 | ((op_t *) dstp)[7] = cccc; | |
| 62 | dstp += 8 * OPSIZ; | |
| 63 | xlen -= 1; | |
| 64 | } | |
| 65 | len %= OPSIZ * 8; | |
| 66 | ||
| 67 | /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */ | |
| 68 | xlen = len / OPSIZ; | |
| 69 | while (xlen > 0) | |
| 70 | { | |
| 71 | ((op_t *) dstp)[0] = cccc; | |
| 72 | dstp += OPSIZ; | |
| 73 | xlen -= 1; | |
| 74 | } | |
| 75 | len %= OPSIZ; | |
| 76 | } | |
| 77 | ||
| 78 | /* Write the last few bytes. */ | |
| 79 | while (len > 0) | |
| 80 | { | |
| 81 | ((byte *) dstp)[0] = c; | |
| 82 | dstp += 1; | |
| 83 | len -= 1; | |
| 84 | } | |
| 85 | ||
| 86 | return dstpp; | |
| 87 | } | |
| 85dd1003 | 88 | libc_hidden_builtin_def (memset) |