55 lines
1.3 KiB
C
55 lines
1.3 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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char *
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strcpy(char *dst, const char *src)
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{
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char *ptr = dst;
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if (src && *src) {
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while (*src) {
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*ptr++ = *src++;
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}
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*ptr++ = 0;
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}
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return dst;
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}
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char *
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strncpy(char *dst, const char *src, size_t len)
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{
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char *ptr = dst;
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if (len) {
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do {
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// When src reaches ends, assigns \0 before fail.
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if (!(*ptr++ = *src++)) {
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// Did you know that the spec says you must
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// fill the remaining of the string with \0?
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// Because you are supposed to copy len
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// bytes.
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while (len--)
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*ptr++ = 0;
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break;
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}
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} while(--len);
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}
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return dst;
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}
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