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45 lines
2.5 KiB
C
45 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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/**
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* Prepares static search buffer.
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*
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* 1. If SRC is too long, it's truncated and *not* NUL-terminated.
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* 2. If SRC is too short, the remainder is zero-filled.
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*
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* @param dst is output buffer
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* @param src is a nul-terminated string
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* @param dstlen is size of `dst` buffer
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* @return dst
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* @asyncsignalsafe
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* @see stpncpy()
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* @see strlcpy()
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* @see memccpy()
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*/
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char *strncpy(char *dst, const char *src, size_t dstlen) {
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size_t srclen, cpylen, zerlen;
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srclen = strlen(src);
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cpylen = MIN(srclen, dstlen);
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if (cpylen) memcpy(dst, src, cpylen);
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zerlen = dstlen - cpylen;
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if (zerlen) bzero(dst + cpylen, zerlen);
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return dst;
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}
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