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/* $OpenBSD: wcslcat.c,v 1.6 2015/09/12 16:23:14 guenther Exp $ */ |
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/* |
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* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* 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 WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <wchar.h> |
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/* |
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* Appends src to string dst of size dsize (unlike strncat, dsize is the |
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* full size of dst, not space left). At most dsize-1 characters |
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* will be copied. Always NUL terminates (unless dsize <= wcslen(dst)). |
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* Returns wcslen(src) + MIN(dsize, wcslen(initial dst)). |
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* If retval >= siz, truncation occurred. |
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*/ |
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size_t |
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wcslcat(wchar_t *dst, const wchar_t *src, size_t dsize) |
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{ |
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const wchar_t *odst = dst; |
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const wchar_t *osrc = src; |
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size_t n = dsize; |
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size_t dlen; |
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/* Find the end of dst and adjust bytes left but don't go past end. */ |
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while (n-- != 0 && *dst != L'\0') |
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dst++; |
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dlen = dst - odst; |
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n = dsize - dlen; |
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if (n-- == 0) |
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return(dlen + wcslen(src)); |
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while (*src != L'\0') { |
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if (n != 0) { |
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*dst++ = *src; |
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n--; |
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} |
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src++; |
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} |
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*dst = L'\0'; |
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return(dlen + (src - osrc)); /* count does not include NUL */ |
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} |
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DEF_WEAK(wcslcat); |