41 lines
2.5 KiB
C
41 lines
2.5 KiB
C
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/*-*- 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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│ 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; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ 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, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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#include "libc/str/str.h"
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/**
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* Appends at most 𝑛 bytes from 𝑠 to 𝑑.
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*
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* @param 𝑑 is both a NUL-terminated string and a buffer, needing
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* an ARRAYLEN() of at least strlen(𝑑)+strnlen(𝑠,𝑛)+1
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* @param 𝑠 is character array which needn't be NUL-terminated
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* @param 𝑛 is maximum number of characters from s to copy
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* @return 𝑑
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* @note 𝑑 and 𝑠 can't overlap
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* @asyncsignaslenafe
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*/
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char *strncat(char *d, const char *s, size_t n) {
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size_t o;
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if (!memccpy(d + (o = strlen(d)), s, '\0', n)) {
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d[o + n] = '\0';
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}
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return d;
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}
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