Update the messages when an error is detected while reading a line

[thirdparty/sarg.git] / longline.c

/*
 * SARG Squid Analysis Report Generator      http://sarg.sourceforge.net
 *                                                            1998, 2012
 *
 * SARG donations:
 *      please look at http://sarg.sourceforge.net/donations.php
 * Support:
 *     http://sourceforge.net/projects/sarg/forums/forum/363374
 * ---------------------------------------------------------------------
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 */

#include "include/conf.h"
#include "include/defs.h"

#define INITIAL_LINE_BUFFER_SIZE 32768

struct longlinestruct
{
	//! The buffer to store the data read from the log file.
	char *buffer;
	//! The size of the buffer.
	size_t size;
	//! The number of bytes stored in the buffer.
	size_t length;
	//! The position of the beginning of the current string.
	size_t start;
	//! The position of the end of the current string.
	size_t end;
};

longline longline_create(void)
{
	longline line;

	line=malloc(sizeof(*line));
	if (line==NULL) return(NULL);
	line->size=INITIAL_LINE_BUFFER_SIZE;
	line->buffer=malloc(line->size);
	if (line->buffer==NULL) {
		free(line);
		return(NULL);
	}
	line->start=0;
	line->end=0;
	line->length=0;
	return(line);
}

void longline_reset(longline line)
{
	if (line!=NULL) {
		line->start=0;
		line->end=0;
		line->length=0;
	}
}

char *longline_read(FILE *fp_in,longline line)
{
	int i;
	char *newbuf;
	size_t nread;

	if (line==NULL || line->buffer==NULL) return(NULL);

	while (true) {
		for (i=line->end ; i<line->length && (line->buffer[i]=='\n' || line->buffer[i]=='\r') ; i++);
		if (i<line->length) {
			line->end=i;
			break;
		}
		nread=(feof(fp_in)!=0) ? 0 : fread(line->buffer,1,line->size,fp_in);
		if (nread==0) return(NULL);
		line->length=nread;
		line->end=0;
	}

	line->start=line->end;
	while (true) {
		for (i=line->end ; i<line->length ; i++) {
			if ((unsigned char)line->buffer[i]>=' ') continue;
			if (line->buffer[i]=='\n' || line->buffer[i]=='\r') break;
		}

		line->end=i;
		if (line->end<line->length) break;

		if (line->start>0) {
			for (i=line->start ; i<line->length ; i++) line->buffer[i-line->start]=line->buffer[i];
			line->length-=line->start;
			line->end-=line->start;
			line->start=0;
		}
		if (line->length>=line->size) {
			line->size+=8192;
			newbuf=realloc(line->buffer,line->size);
			if (!newbuf) {
				debuga(_("Not enough memory to read one more line from the file\n"));
				exit(EXIT_FAILURE);
			}
			line->buffer=newbuf;
		}
		nread=(feof(fp_in)!=0) ? 0 : fread(line->buffer+line->length,1,line->size-line->length,fp_in);
		if (nread==0) {
			if (line->end<=line->start) return(NULL);
			if (line->end>=line->size) {
				line->end=line->size;
				line->size++;
				newbuf=realloc(line->buffer,line->size);
				if (!newbuf) {
					debuga(_("Not enough memory to read one more line from the file\n"));
					exit(EXIT_FAILURE);
				}
				line->buffer=newbuf;
			}
			line->buffer[line->end]='\0';
			return(line->buffer+line->start);
		}
		line->length+=nread;
	}
	line->buffer[line->end++]='\0';
	return(line->buffer+line->start);
}

void longline_destroy(longline *line_ptr)
{
	longline line;

	if (line_ptr==NULL || *line_ptr==NULL) return;
	line=*line_ptr;
	*line_ptr=NULL;
	if (line->buffer!=NULL) free(line->buffer);
	free(line);
}