35a36,59
> int isgz(char *fn)
> {
> 	char *strend;
> 	int ret;
> 	int len;
> 
> 	if (system ("gzip --version > /dev/null 2>&1") != 0) return -2;
> 	
> 	if(fn==NULL) return -1;
> 	len=strlen(fn);
> 	if(len < 3) return(-1);
> 
> 	strend = malloc(4*sizeof(char));
> 	sprintf(strend,"%c%c%c",fn[len-3],fn[len-2],fn[len-1]);	
> 	if(strcmp(strend,".gz")==0)
> 	{
> 		ret=0;
> 	} else {
> 		ret=-1;
> 	}
> 	free(strend);
> 	return ret;
> }
> 
928a953
>     char *open_cmd;
940a966,968
>     /* open command rather than direct file i/o */
>     open_cmd = (char *) nmalloc(sizeof(char)*(100+strlen(full_filename)));
> 
946a975
> 	    free(open_cmd);
968c997
<     } else if ((fd = open(full_filename, O_RDONLY)) == -1) {
---
>     } else if ((fd = open(full_filename, O_RDONLY)) == -1) {	
974c1003,1009
< 	*f = fdopen(fd, "rb");
---
>         /* The below lines are added in an attempt to open .gz files */	
> 	if(isgz(full_filename) == 0) {
> 		sprintf(open_cmd,"gzip -cdfq \'%s\'",full_filename);     
> 		*f = popen(open_cmd, "r");
> 	} else {
> 		*f = fdopen(fd, "rb");
> 	}
980c1015
< 	} else
---
> 	} else {
981a1017
> 	}
983a1020
>     free(open_cmd);
1716c1753,1755
< 
---
>     char *append_cmd;
>     char *write_cmd;
> 	/* The commands to write to a .gz file */
1729c1768,1769
< 
---
>     write_cmd = (char *) nmalloc(sizeof(char)*(100+strlen(realname)));
>     append_cmd = (char *) nmalloc(sizeof(char)*(100+strlen(realname)));
2032c2072,2082
< 	f = fdopen(fd, (append == APPEND) ? "ab" : "wb");
---
> 	if(isgz(realname) == 0) {        
> 		if(append == APPEND) {
> 			sprintf(append_cmd, "gzip -c >> \'%s\'", realname);
> 			f = popen(append_cmd, "w");
> 		} else {
> 			sprintf(write_cmd, "gzip -c > \'%s\'", realname);
> 			f = popen(write_cmd, "w");
> 		}
> 	} else {
> 		f = fdopen(fd, (append == APPEND) ? "ab" : "wb");
> 	}
2170c2220,2221
< 
---
>     free(append_cmd);
>     free(write_cmd);