strxnmov.c
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上传日期:2022-05-23
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- /* Copyright (C) 2002 MySQL AB
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA */
- /* File : strxnmov.c
- Author : Richard A. O'Keefe.
- Updated: 2 June 1984
- Defines: strxnmov()
- strxnmov(dst, len, src1, ..., srcn, NullS)
- moves the first len characters of the concatenation of src1,...,srcn
- to dst. If there aren't that many characters, a NUL character will
- be added to the end of dst to terminate it properly. This gives the
- same effect as calling strxcpy(buff, src1, ..., srcn, NullS) with a
- large enough buffer, and then calling strnmov(dst, buff, len).
- It is just like strnmov except that it concatenates multiple sources.
- Beware: the last argument should be the null character pointer.
- Take VERY great care not to omit it! Also be careful to use NullS
- and NOT to use 0, as on some machines 0 is not the same size as a
- character pointer, or not the same bit pattern as NullS.
- Note: strxnmov is like strnmov in that it moves up to len
- characters; dst will be padded on the right with one NUL characters if
- needed.
- */
- #include <my_global.h>
- #include "m_string.h"
- #include <stdarg.h>
- char *strxnmov(char *dst,uint len, const char *src, ...)
- {
- va_list pvar;
- char *end_of_dst=dst+len;
- va_start(pvar,src);
- while (src != NullS)
- {
- do
- {
- if (dst == end_of_dst)
- goto end;
- }
- while ((*dst++ = *src++));
- dst--;
- src = va_arg(pvar, char *);
- }
- *dst=0;
- end:
- va_end(pvar);
- return dst;
- }