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Path: utzoo!utgpu!water!watmath!clyde!rutgers!uwvax!uwmacc!hobbes!root
From: root@hobbes.UUCP
Newsgroups: comp.unix.xenix
Subject: New bug in uPort: stdio is broken.
Message-ID: <202@hobbes.UUCP>
Date: Sun, 30-Aug-87 22:01:30 EDT
Article-I.D.: hobbes.202
Posted: Sun Aug 30 22:01:30 1987
Date-Received: Tue, 1-Sep-87 01:02:44 EDT
References: <593@sugar.UUCP>
Reply-To: root@hobbes.UUCP (John Plocher)
Followup-To: comp.unix.xenix
Organization: U of Wisconsin - Madison  Spanish Department
Lines: 67

+---- Peter da Silva writes the following in article <593@sugar.UUCP> ----
| [[ concerning a "supposed" bug in Microport SV/AT ]]
| The following program will not work with the printf(""); taken out. It
| appears that stdio() doesn't come up properly initted. This is a bug.
| You should be able to interleaf printf() and putchar() in any order.
| 
| #include <stdio.h>
| #include <ctype.h>
| main(ac, av) int ac; char **av;
| {
| 	printf(""); /* needed! */
| 	while(*++av) {
| 		while(**av) {
| 			if(isdigit(**av)) break;
| 			if(isupper(**av)) break;
| 			if(islower(**av)) break;
| 			if(strchr(**av, "-_=+")) break;
| 			++*av;
| 		}
| 		while(isalnum(**av) || strchr(**av, ".-_=+")) {
| 			putchar(**av);
| 			++*av;
| 		}
| 		putchar(' ');
| 	}
| 	putchar('\n');
| }
+----

Not a bug in stdio - replace the "printf("");" with "strlen("");" and it works,
too.  The *REAL* bug is that your code is corrupting the stack, specifically
the call to strchr().  You have reversed the arguments to the function.

	From the S5r2 man page string(3C):

	char *strchr(s, c)
	char *s;
	int c;


I *hate* it when people blame the OS for their simple programming errors.
I used lint to find this one:

% lint x.c
x.c
==============
(37)  warning: main() returns random value to invocation environment
warning: argument unused in function:
    (37)  ac in main
==============
value type used inconsistently
    strchr   	llib-lc(424) :: x.c(27)
    strchr   	llib-lc(424) :: x.c(30)
value type declared inconsistently
    strchr   	llib-lc(424) :: x.c(30)
function argument ( number ) used inconsistently
    strchr( arg 1 )   	llib-lc(424) :: x.c(27)
    strchr( arg 2 )   	llib-lc(424) :: x.c(27)
    strchr( arg 1 )   	llib-lc(424) :: x.c(30)
    strchr( arg 2 )   	llib-lc(424) :: x.c(30)
function returns value which is always ignored
    putchar	


FLAME ON:  Why don't *you* use it?  That's what its for! FLAME OFF!
-- 
John Plocher uwvax!geowhiz!uwspan!plocher  plocher%uwspan.UUCP@uwvax.CS.WISC.EDU