41 lines
2.4 KiB
C
41 lines
2.4 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/bits/safemacros.h"
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#include "libc/str/str.h"
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/**
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* Appends string SRC to DEST, the BSD way.
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*
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* @param dest is a buffer holding a NUL-terminated string
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* @param src is a NUL-terminated string
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* @param size is byte capacity of dest
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* @return strlen(dest) + strlen(src)
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* @note dest and src can't overlap
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* @see strncat()
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*/
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size_t strlcat(char *dest, const char *src, size_t size) {
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size_t destlen = strnlen(dest, size);
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size_t srclen = strlen(src);
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if (size) {
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memcpy(&dest[destlen], src, min(srclen, size - destlen));
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dest[min(destlen + srclen, size - 1)] = '\0';
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}
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return destlen + srclen;
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}
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