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  buffer.c - functions for handling buffers
  Copyright (C) 2002 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, 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
  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  

#ifndef _BUFFER_H
#define _BUFFER_H 1

/* structure for holding a string */
struct buffer
  char *buf;     /* pointer to allocated memory */
  int alloc;      /* size of allocated memory */
  int len;        /* amount of memory in use */

/* intialize struct buffer and allocate memory for it */
void buffer_init(struct buffer *line,int alloc);

/* change the size of the line */
void buffer_grow(struct buffer *line,int alloc);

/* free allocated memory */
void buffer_free(struct buffer *line);

/* make a copy of the sc line into dst line
   optionaly growing of allocationg dst
   the orriginal content of dst is lost and a pointer
   to the result (dst or a new line if dst==NULL) */
struct buffer *buffer_copy(struct buffer *dst,struct buffer *src);

/* read a single line from the file 
   this function returns a struct buffer structure containing
   the read line with newline or NULL on EOF
   lines are delimited by the delim char */
struct buffer *buffer_readline(FILE *in,struct buffer *line,char delim);

/* read a complete file into a buffer */
struct buffer *buffer_readfile(FILE *in,struct buffer *buf);

#endif /* _BUFFER_H */

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