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mf_iocache2.c
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C/C++ Source or Header
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2000-11-17
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6KB
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219 lines
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
/*
More functions to be used with IO_CACHE files
*/
#define MAP_TO_USE_RAID
#include "mysys_priv.h"
#include <m_string.h>
#include <stdarg.h>
#include <m_ctype.h>
/*
** Fix that next read will be made at certain position
** This only works with READ_CACHE
*/
void my_b_seek(IO_CACHE *info,my_off_t pos)
{
info->seek_not_done=1;
info->pos_in_file=pos;
info->rc_pos=info->rc_end=info->buffer;
}
/*
** Fill buffer
** return: 0 on error or EOF (info->error = -1 on error)
** number of characters
*/
uint my_b_fill(IO_CACHE *info)
{
my_off_t pos_in_file=info->pos_in_file+(uint) (info->rc_end - info->buffer);
my_off_t max_length;
uint diff_length,length;
if (info->seek_not_done)
{ /* File touched, do seek */
if (my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(0)) ==
MY_FILEPOS_ERROR)
{
info->error= 0;
return 0;
}
info->seek_not_done=0;
}
diff_length=(uint) (pos_in_file & (IO_SIZE-1));
max_length= (my_off_t) (info->end_of_file - pos_in_file);
if (max_length > (my_off_t) (info->read_length-diff_length))
max_length=(my_off_t) (info->read_length-diff_length);
if (!max_length)
{
info->error= 0;
return 0; /* EOF */
}
else if ((length=my_read(info->file,info->buffer,(uint) max_length,
info->myflags)) == (uint) -1)
{
info->error= -1;
return 0;
}
info->rc_pos=info->buffer;
info->rc_end=info->buffer+length;
info->pos_in_file=pos_in_file;
return length;
}
/*
** Read a string ended by '\n' into a buffer of 'max_length' size.
** Returns number of characters read, 0 on error.
** last byte is set to '\0'
*/
uint my_b_gets(IO_CACHE *info, char *to, uint max_length)
{
uint length;
max_length--; /* Save place for end \0 */
/* Calculate number of characters in buffer */
if (!(length= (uint) (info->rc_end - info->rc_pos)))
if (!(length=my_b_fill(info)))
return 0;
for (;;)
{
char *pos,*end;
if (length > max_length)
length=max_length;
for (pos=info->rc_pos,end=pos+length ; pos < end ;)
{
if ((*to++ = *pos++) == '\n')
{
length= (uint) (pos-info->rc_pos);
info->rc_pos=pos;
*to='\0';
return length;
}
}
if (!(max_length-=length))
{
/* Found enough charcters; Return found string */
info->rc_pos=pos;
*to='\0';
return length;
}
if (!(length=my_b_fill(info)))
return 0;
}
}
/*
Simple printf version. Supports '%s', '%d', '%u', "%ld" and "%lu"
Used for logging in MySQL
returns number of written character, or (uint) -1 on error
*/
uint my_b_printf(IO_CACHE *info, const char* fmt, ...)
{
int result;
va_list args;
va_start(args,fmt);
result=my_b_vprintf(info, fmt, args);
va_end(args);
return result;
}
uint my_b_vprintf(IO_CACHE *info, const char* fmt, va_list args)
{
reg1 char *to= info->rc_pos;
char *end=info->rc_end;
uint out_length=0;
for (; *fmt ; fmt++)
{
if (*fmt++ != '%')
{
/* Copy everything until '%' or end of string */
const char *start=fmt-1;
uint length;
for (; *fmt && *fmt != '%' ; fmt++ ) ;
length= (uint) (fmt - start);
out_length+=length;
if (my_b_write(info, start, length))
goto err;
if (!*fmt) /* End of format */
{
return out_length;
}
fmt++;
/* Found one '%' */
}
/* Skipp if max size is used (to be compatible with printf) */
while (isdigit(*fmt) || *fmt == '.' || *fmt == '-')
fmt++;
if (*fmt == 's') /* String parameter */
{
reg2 char *par = va_arg(args, char *);
uint length = (uint) strlen(par);
out_length+=length;
if (my_b_write(info, par, length))
goto err;
}
else if (*fmt == 'd' || *fmt == 'u') /* Integer parameter */
{
register int iarg;
uint length;
char buff[17];
iarg = va_arg(args, int);
if (*fmt == 'd')
length= (uint) (int10_to_str((long) iarg,buff, -10) - buff);
else
length= (uint) (int10_to_str((long) (uint) iarg,buff,10)- buff);
out_length+=length;
if (my_b_write(info, buff, length))
goto err;
}
else if (*fmt == 'l' && fmt[1] == 'd' || fmt[1] == 'u')/* long parameter */
{
register long iarg;
uint length;
char buff[17];
iarg = va_arg(args, long);
if (*++fmt == 'd')
length= (uint) (int10_to_str(iarg,buff, -10) - buff);
else
length= (uint) (int10_to_str(iarg,buff,10)- buff);
out_length+=length;
if (my_b_write(info, buff, length))
goto err;
}
else
{
/* %% or unknown code */
if (my_b_write(info, "%", 1))
goto err;
out_length++;
}
}
return out_length;
err:
return (uint) -1;
}