🚀 go-pugleaf

Subject: ttyslot speedup
Index:	<src/lib/c/gen>/<ttyslot.c> 2.9bsd

Description:
	A subfunction of ttyslot reads /etc/ttys a character at a time,
	using a system call per character.
Repeat-By:
	Observation.
Fix:
	How about ....
	Side effect -- slightly larger versions of login, wall, and passwd.
*** ttyslot.c~	Wed Feb  6 17:56:55 1985
--- ttyslot.c	Wed Feb  6 16:51:57 1985
***************
*** 27,28
  	register char *tp, *p;
  	register s, tf;

--- 27,29 -----
  	register char *tp, *p;
+ #ifdef SLOWGETTTYS
  	register s, tf;
***************
*** 28,29
  	register s, tf;
  

--- 29,34 -----
  	register s, tf;
+ #else
+ 	register s;
+ 	FILE *tf;
+ #endif
  
***************
*** 35,36
  		p++;
  	if ((tf=open(ttys, 0)) < 0)

--- 40,42 -----
  		p++;
+ #ifdef SLOWGETTTYS
  	if ((tf=open(ttys, 0)) < 0)
***************
*** 36,37
  	if ((tf=open(ttys, 0)) < 0)
  		return(0);

--- 42,46 -----
  	if ((tf=open(ttys, 0)) < 0)
+ #else
+ 	if ((tf=fopen(ttys, "r")) == (FILE *)NULL)
+ #endif
  		return(0);
***************
*** 41,42
  		if (strcmp(p, tp)==0) {
  			close(tf);

--- 50,52 -----
  		if (strcmp(p, tp)==0) {
+ #ifdef	SLOWGETTTYS
  			close(tf);
***************
*** 42,43
  			close(tf);
  			return(s);

--- 52,56 -----
  			close(tf);
+ #else
+ 			fclose(tf);
+ #endif
  			return(s);
***************
*** 45,46
  	}
  	close(tf);

--- 58,60 -----
  	}
+ #ifdef	SLOWGETTTYS
  	close(tf);
***************
*** 46,47
  	close(tf);
  	return(0);

--- 60,64 -----
  	close(tf);
+ #else
+ 	fclose(tf);
+ #endif
  	return(0);
***************
*** 48,49
  }
  static char *

--- 65,67 -----
  }
+ #ifdef	SLOWGETTTYS
  static char *
***************
*** 74
  }

--- 92,117 -----
  }
+ #else
+ 
+ static char *
+ getttys(f)
+ FILE *f;
+ {
+ 	static char line[DIRSIZ + 4];
+ 	register char *lp;
+ 	register char *lb;
+ 	char lbuf[132];
+ 
+ 	lp = line;
+ 	lb = lbuf;
+ 	fgets(lbuf, sizeof(lbuf), f);
+ 	if ( feof(f) || ferror(f) )
+ 		return((char *)NULL);
+ 	while (!(*lb=='\t'||*lb==' '||*lb=='\n'||lp >= &line[sizeof(line)]))
+ 		*lp++ = *lb++;
+ 	*lp = '\000';
+ 	if ( lp <= &line[2])
+ 		return((char *)NULL);
+ 	else
+ 		return(&line[2]);
+ }
+ #endif