60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/*
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* This file is part of NativeOS
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* Copyright (C) 2015-2018 The NativeOS contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stddef.h>
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int
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strcmp(const char *s1, const char *s2)
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{
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unsigned char *cmp1 = (unsigned char *) s1;
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unsigned char *cmp2 = (unsigned char *) s2;
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while (*cmp1 && *cmp2) {
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if (*cmp1 != *cmp2) {
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return *cmp1 - *cmp2;
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}
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cmp1++;
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cmp2++;
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}
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return *cmp1 - *cmp2;
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}
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int
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strncmp(const char *s1, const char *s2, size_t n)
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{
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unsigned char *cmp1 = (unsigned char *) s1;
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unsigned char *cmp2 = (unsigned char *) s2;
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if (n == 0) {
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/* Early bail out. */
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return 0;
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}
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/* Bail as soon as any string ends. */
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while (*cmp1 && *cmp2 && n--) {
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if (*cmp1 != *cmp2) {
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return *cmp1 - *cmp2;
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}
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cmp1++;
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cmp2++;
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}
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return *cmp1 - *cmp2;
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}
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