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/*
buffer.c - functions for handling buffers
Copyright (C) 2001, 2002, 2003, 2005 Arthur de Jong
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "rl.h"
#include "buffer.h"
#include "alloc.h"
/* intialize struct buffer and allocate memory for it */
void
buffer_init(struct buffer *line,int alloc)
{
line->alloc=alloc;
line->buf=xxmalloc(char,line->alloc);
line->len=0;
}
/* change the size of the line */
void
buffer_grow(struct buffer *line,int alloc)
{
line->alloc=alloc;
line->buf=xxrealloc(line->buf,char,line->alloc);
}
/* free allocated memory */
void
buffer_free(struct buffer *line)
{
if (line->buf==NULL)
return; /* not allocated so not freed */
xfree(line->buf);
line->buf=NULL;
line->alloc=0;
}
/* make a copy of the src buffer into dst buffer
optionaly growing or allocating dst
the orriginal content of dst is lost and a pointer
to the result (dst or a new buffer if dst==NULL)
is returned */
struct buffer *
buffer_copy(struct buffer *dst,struct buffer *src)
{
if (dst==NULL)
{
dst=xxmalloc(struct buffer,1);
buffer_init(dst,src->len+AVGLINELEN/2);
}
else if (dst->alloc<src->len)
{
buffer_grow(dst,src->len+AVGLINELEN/2);
}
memcpy(dst->buf,src->buf,src->len);
dst->len=src->len;
dst->linenumber=src->linenumber;
return dst;
}
/* read a single line from the file
this function returns a buffer structure containing
the read line with newline or NULL on EOF
lines are delimited by the delim char
if line is not NULL a new buffer is initialized
and returned, otherwise the lines is read in the line buffer */
struct buffer *
buffer_readline(FILE *in,struct buffer *line,char delim)
{
int c; /* the char read */
struct buffer *orr;
/* initialize new line if NULL */
orr=line;
if (line==NULL)
{
/* make a new line */
line=xxmalloc(struct buffer,1);
buffer_init(line,AVGLINELEN*2);
}
line->len=0;
while ( ((c=fgetc(in))!=EOF) )
{
/* check allocated memory */
if (line->alloc<(line->len+1))
buffer_grow(line,line->alloc*2);
/* store */
line->buf[line->len++]=c;
/* check for delim */
if (c==delim)
break; /* exit while */
}
/* check if anything was read */
if (line->len==0)
{
/* free the line if it was created here */
if (orr==NULL)
{
buffer_free(line);
xfree(line);
}
return NULL;
}
/* the line was read */
return line;
}
/* read a complete file into a buffer */
struct buffer *
buffer_readfile(FILE *in,struct buffer *buf)
{
int i;
/* initialize buffer */
if (buf==NULL)
{
buf=xxmalloc(struct buffer,1);
buffer_init(buf,BLOCKSIZE*2);
}
/* read the file */
buf->len=0;
do
{
/* grow buffer if needed */
if (buf->alloc<=buf->len+BLOCKSIZE)
buffer_grow(buf,buf->alloc*2);
i=fread(buf->buf+buf->len,sizeof(char),BLOCKSIZE,in);
buf->len+=i;
}
while (i==BLOCKSIZE);
return buf;
}
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