| /* Copyright (C) 1991-2018 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 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <string.h> |
| #include <stdint.h> |
| #include <libc-pointer-arith.h> |
| |
| #undef strcspn |
| |
| #ifndef STRCSPN |
| # define STRCSPN strcspn |
| #endif |
| |
| /* Return the length of the maximum initial segment of S |
| which contains no characters from REJECT. */ |
| size_t |
| STRCSPN (const char *str, const char *reject) |
| { |
| if (__glibc_unlikely (reject[0] == '\0') || |
| __glibc_unlikely (reject[1] == '\0')) |
| return __strchrnul (str, reject [0]) - str; |
| |
| /* Use multiple small memsets to enable inlining on most targets. */ |
| unsigned char table[256]; |
| unsigned char *p = memset (table, 0, 64); |
| memset (p + 64, 0, 64); |
| memset (p + 128, 0, 64); |
| memset (p + 192, 0, 64); |
| |
| unsigned char *s = (unsigned char*) reject; |
| unsigned char tmp; |
| do |
| p[tmp = *s++] = 1; |
| while (tmp); |
| |
| s = (unsigned char*) str; |
| if (p[s[0]]) return 0; |
| if (p[s[1]]) return 1; |
| if (p[s[2]]) return 2; |
| if (p[s[3]]) return 3; |
| |
| s = (unsigned char *) PTR_ALIGN_DOWN (s, 4); |
| |
| unsigned int c0, c1, c2, c3; |
| do |
| { |
| s += 4; |
| c0 = p[s[0]]; |
| c1 = p[s[1]]; |
| c2 = p[s[2]]; |
| c3 = p[s[3]]; |
| } |
| while ((c0 | c1 | c2 | c3) == 0); |
| |
| size_t count = s - (unsigned char *) str; |
| return (c0 | c1) != 0 ? count - c0 + 1 : count - c2 + 3; |
| } |
| libc_hidden_builtin_def (strcspn) |