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/* 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 */
/* readline for batch mode */
#include <global.h>
#include <my_sys.h>
#include <m_string.h>
#include "my_readline.h"
static bool init_line_buffer(LINE_BUFFER *buffer,File file,ulong size,
ulong max_size);
static bool init_line_buffer_from_string(LINE_BUFFER *buffer,my_string str);
static uint fill_buffer(LINE_BUFFER *buffer);
static char *intern_read_line(LINE_BUFFER *buffer,uint *out_length);
LINE_BUFFER *batch_readline_init(ulong max_size,FILE *file)
{
LINE_BUFFER *line_buff;
if (!(line_buff=(LINE_BUFFER*) my_malloc(sizeof(*line_buff),MYF(MY_WME))))
return 0;
if (init_line_buffer(line_buff,fileno(file),IO_SIZE,max_size))
{
my_free((char*) line_buff,MYF(0));
return 0;
}
return line_buff;
}
char *batch_readline(LINE_BUFFER *line_buff)
{
char *pos;
uint out_length;
if (!(pos=intern_read_line(line_buff,&out_length)))
return 0;
if (out_length && pos[out_length-1] == '\n')
out_length--; /* Remove '\n' */
pos[out_length]=0;
return pos;
}
void batch_readline_end(LINE_BUFFER *line_buff)
{
if (line_buff)
{
my_free((gptr) line_buff->buffer,MYF(MY_ALLOW_ZERO_PTR));
my_free((char*) line_buff,MYF(0));
}
}
LINE_BUFFER *batch_readline_command(my_string str)
{
LINE_BUFFER *line_buff;
if (!(line_buff=(LINE_BUFFER*) my_malloc(sizeof(*line_buff),MYF(MY_WME))))
return 0;
if (init_line_buffer_from_string(line_buff,str))
{
my_free((char*) line_buff,MYF(0));
return 0;
}
return line_buff;
}
/*****************************************************************************
Functions to handle buffered readings of lines from a stream
******************************************************************************/
static bool
init_line_buffer(LINE_BUFFER *buffer,File file,ulong size,ulong max_buffer)
{
bzero((char*) buffer,sizeof(buffer[0]));
buffer->file=file;
buffer->bufread=size;
buffer->max_size=max_buffer;
if (!(buffer->buffer = (char*) my_malloc(buffer->bufread+1,
MYF(MY_WME | MY_FAE))))
return 1;
buffer->end_of_line=buffer->end=buffer->buffer;
buffer->buffer[0]=0; /* For easy start test */
return 0;
}
static bool init_line_buffer_from_string(LINE_BUFFER *buffer,my_string str)
{
uint length;
bzero((char*) buffer,sizeof(buffer[0]));
length=strlen(str);
if (!(buffer->buffer=buffer->start_of_line=buffer->end_of_line=
(char*)my_malloc(length+2,MYF(MY_FAE))))
return 1;
memcpy(buffer->buffer,str,length);
buffer->buffer[length]='\n';
buffer->buffer[length+1]=0;
buffer->end=buffer->buffer+length+1;
buffer->eof=1;
buffer->max_size=1;
return 0;
}
static void free_line_buffer(LINE_BUFFER *buffer)
{
if (buffer->buffer)
{
my_free((gptr) buffer->buffer,MYF(0));
buffer->buffer=0;
}
}
/* Fill the buffer retaining the last n bytes at the beginning of the
newly filled buffer (for backward context). Returns the number of new
bytes read from disk. */
static uint fill_buffer(LINE_BUFFER *buffer)
{
uint read_count;
uint bufbytes= (uint) (buffer->end - buffer->start_of_line);
if (buffer->eof)
return 0; /* Everything read */
/* See if we need to grow the buffer. */
for (;;)
{
uint start_offset=(uint) (buffer->start_of_line - buffer->buffer);
read_count=(buffer->bufread - bufbytes)/IO_SIZE;
if ((read_count*=IO_SIZE))
break;
buffer->bufread *= 2;
if (!(buffer->buffer = (char*) my_realloc(buffer->buffer,
buffer->bufread+1,
MYF(MY_WME | MY_FAE))))
return (uint) -1;
buffer->start_of_line=buffer->buffer+start_offset;
buffer->end=buffer->buffer+bufbytes;
}
/* Shift stuff down. */
if (buffer->start_of_line != buffer->buffer)
{
bmove(buffer->buffer,buffer->start_of_line,(uint) bufbytes);
buffer->end=buffer->buffer+bufbytes;
}
/* Read in new stuff. */
if ((read_count= my_read(buffer->file, (byte*) buffer->end, read_count,
MYF(MY_WME))) == MY_FILE_ERROR)
return read_count;
DBUG_PRINT("fill_buff", ("Got %d bytes", read_count));
/* Kludge to pretend every nonempty file ends with a newline. */
if (!read_count && bufbytes && buffer->end[-1] != '\n')
{
buffer->eof = read_count = 1;
*buffer->end = '\n';
}
buffer->end_of_line=(buffer->start_of_line=buffer->buffer)+bufbytes;
buffer->end+=read_count;
*buffer->end=0; /* Sentinel */
return read_count;
}
char *intern_read_line(LINE_BUFFER *buffer,uint *out_length)
{
char *pos;
uint length;
DBUG_ENTER("intern_read_line");
buffer->start_of_line=buffer->end_of_line;
for (;;)
{
pos=buffer->end_of_line;
while (*pos != '\n' && *pos)
pos++;
if (pos == buffer->end)
{
if ((uint) (pos - buffer->start_of_line) < buffer->max_size)
{
if (!(length=fill_buffer(buffer)) || length == (uint) -1)
DBUG_RETURN(0);
continue;
}
pos--; /* break line here */
}
buffer->end_of_line=pos+1;
*out_length=(uint) (pos + 1 - buffer->eof - buffer->start_of_line);
DBUG_RETURN(buffer->start_of_line);
}
}
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