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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <m_string.h>
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#include <stdarg.h>
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#include <m_ctype.h>
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int my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap)
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{
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char *start=to, *end=to+n-1;
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for (; *fmt ; fmt++)
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{
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if (fmt[0] != '%')
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{
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if (to == end) /* End of buffer */
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break;
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*to++= *fmt; /* Copy ordinary char */
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continue;
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}
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/* Skipp if max size is used (to be compatible with printf) */
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fmt++;
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while (isdigit(*fmt) || *fmt == '.' || *fmt == '-')
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fmt++;
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if (*fmt == 's') /* String parameter */
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{
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reg2 char *par = va_arg(ap, char *);
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uint plen = (uint) strlen(par);
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if ((uint) (end-to) > plen) /* Replace if possible */
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{
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to=strmov(to,par);
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continue;
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}
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}
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else if (*fmt == 'd' || *fmt == 'u') /* Integer parameter */
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{
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register int iarg;
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if ((uint) (end-to) < 16)
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break;
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iarg = va_arg(ap, int);
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if (*fmt == 'd')
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to=int10_to_str((long) iarg,to, -10);
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else
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to=int10_to_str((long) (uint) iarg,to,10);
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continue;
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}
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/* We come here on '%%', unknown code or too long parameter */
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if (to == end)
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break;
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*to++='%'; /* % used as % or unknown code */
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}
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*to='\0'; /* End of errmessage */
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return (uint) (to - start);
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}
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