File: lines.c

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pgn-extract 16.0-1
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/*
 *  Program: pgn-extract: a Portable Game Notation (PGN) extractor.
 *  Copyright (C) 1994-2005 David Barnes
 *  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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  David Barnes may be contacted as D.J.Barnes@kent.ac.uk
 *  http://www.cs.kent.ac.uk/people/staff/djb/
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "bool.h"
#include "mymalloc.h"
#include "lines.h"

    /* Read a single line of input. */
#define INIT_LINE_LENGTH 80
#define LINE_INCREMENT 20

/* Define a character that may be used to comment a line in, e.g.
 * the variations files.
 * Use the PGN escape mechanism character, for consistency.
 */
#define COMMENT_CHAR '%'

char *
read_line(FILE *fpin)
{   char *line = NULL;
    unsigned len = 0;
    unsigned max_length;
    int ch;

     ch = getc(fpin);
     if(ch != EOF){
	line = (char *) MallocOrDie(INIT_LINE_LENGTH + 1);
	max_length = INIT_LINE_LENGTH;
	while((ch != '\n') && (ch != EOF)){
	    /* Another character to add. */
	    if(len == max_length){
		 line = (char *)ReallocOrDie((void *)line,
					    max_length+LINE_INCREMENT+1);
		 if(line == NULL){
		     return NULL;
		 }
		 max_length += LINE_INCREMENT;
	    }
	    line[len] = ch;
	    len++;
	    ch = getc(fpin);
	}
	line[len] = '\0';
     }
     return line;
}

	/* Return TRUE if line contains a non-space character, but
         * is not a comment line.
         */
Boolean
non_blank_line(const char *line)
{   Boolean blank = TRUE;

    if(line != NULL){
	if(comment_line(line)){
	    /* Comment lines count as blanks. */
	}
	else{
	    while(blank && (*line != '\0')){
		if(!isspace((int) *line)){
		    blank = FALSE;
		}
		else{
		    line++;
		}
	    }
	}
    }
    return !blank;
}

Boolean
blank_line(const char *line)
{
    return !non_blank_line(line);
}


	/* Should the given line be regarded as a comment line? */
Boolean
comment_line(const char *line)
{
    return *line == COMMENT_CHAR;
}