#include "lfgets.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* dynamic (expanding buffer) fgets */
/* OrangeTide 19971201 <jmayo@mail.alliance.net> */
/* PUBLIC DOMAIN - Jon Mayo - December 1, 1997 */

/* if limit is -1, then don't do limiting
 * limit must be greater than LFGETS_INITSIZE
 * if nlstrip then cut the nl off before returning
 * 
 * return:
 * 	NULL on reading EOF or alloc error
 * 	dynamically created buffer on success
 * 	cropped buffer on reading beyond the limit
 * 
 */

char *lfgets(FILE *stream, int nlstrip, int limit)
{
	char *Ret = NULL;
	int curr = 0;
	int currsize = LFGETS_INITSIZE;
	
	if(limit<LFGETS_INITSIZE) limit=LFGETS_INITSIZE;
	
	if (feof(stream))
		return NULL;
   
	while( (Ret=realloc(Ret,currsize+1)) && (fgets(Ret+curr,currsize-curr,stream))) {
		if ((curr+=strlen(Ret+curr)) && Ret[curr-1] == '\n') { /* we don't want 0-1 */
			if(nlstrip)
				Ret[curr-1]=0; /* strip the newline */
			break;
		}
		if(limit>0 && curr>=limit) {
			return Ret; /* limit exceeded, just return it */
		}
		currsize*=2; /* double the size for the next realloc() */
		if(limit>0 && currsize>limit) currsize=limit;	
	}      
	/*  ((limit >= currsize) || (limit < 0)) ) */
	return curr ? Ret : (free(Ret),NULL); 
}