Return back to BSD snprintf semantics which recent C9x standard adopts

instead of Singe Unix, thanx Bruce for explaining, I am not realize
standards war was there.

But now, fix n == 0 case to not return error and fix check for too
big n.

Things left to do: check for overflow in arguments.

3 files changed, 23 insertions, 21 deletions

diff --git a/lib/libc/stdio/snprintf.c b/lib/libc/stdio/snprintf.c
index bfcf72c..b3944e3 100644
--- a/lib/libc/stdio/snprintf.c
+++ b/lib/libc/stdio/snprintf.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)snprintf.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id: snprintf.c,v 1.7 1997/12/24 14:32:39 ache Exp $";
+		"$Id: snprintf.c,v 1.8 1997/12/24 20:24:05 ache Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -65,10 +65,12 @@ snprintf(str, n, fmt, va_alist)
 	int ret;
 	va_list ap;
 	FILE f;
+	int on;
 
-	if (n == 0)
-		return (0);
-	if (--n > INT_MAX)
+	on = n;
+	if (n > 0)
+		n--;
+	if (n > INT_MAX)
 		return (EOF);
 #if __STDC__
 	va_start(ap, fmt);
@@ -80,7 +82,8 @@ snprintf(str, n, fmt, va_alist)
 	f._bf._base = f._p = (unsigned char *)str;
 	f._bf._size = f._w = n;
 	ret = vfprintf(&f, fmt, ap);
-	*f._p = 0;
+	if (on > 0)
+		*f._p = '\0';
 	va_end(ap);
-	return (ret > (int)n ? n : ret);
+	return (ret);
 }
diff --git a/lib/libc/stdio/vfprintf.c b/lib/libc/stdio/vfprintf.c
index 4abdbc4..3457c86 100644
--- a/lib/libc/stdio/vfprintf.c
+++ b/lib/libc/stdio/vfprintf.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)vfprintf.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id: vfprintf.c,v 1.13 1997/12/19 21:59:22 bde Exp $";
+		"$Id: vfprintf.c,v 1.14 1997/12/24 13:47:13 ache Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 /*
@@ -643,18 +643,14 @@ fp_begin:		if (prec == -1)
 			break;
 #endif /* FLOATING_POINT */
 		case 'n':
-			n = ret;
-			if ((fp->_flags & __SSTR) &&
-			    fp->_bf._size < n)
-				n = fp->_bf._size;
 			if (flags & QUADINT)
-				*GETARG(quad_t *) = n;
+				*GETARG(quad_t *) = ret;
 			else if (flags & LONGINT)
-				*GETARG(long *) = n;
+				*GETARG(long *) = ret;
 			else if (flags & SHORTINT)
-				*GETARG(short *) = n;
+				*GETARG(short *) = ret;
 			else
-				*GETARG(int *) = n;
+				*GETARG(int *) = ret;
 			continue;	/* no output */
 		case 'O':
 			flags |= LONGINT;
diff --git a/lib/libc/stdio/vsnprintf.c b/lib/libc/stdio/vsnprintf.c
index 738dd21..fa91175 100644
--- a/lib/libc/stdio/vsnprintf.c
+++ b/lib/libc/stdio/vsnprintf.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id: vsnprintf.c,v 1.7 1997/12/24 14:32:40 ache Exp $";
+		"$Id: vsnprintf.c,v 1.8 1997/12/24 20:24:08 ache Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -54,16 +54,19 @@ vsnprintf(str, n, fmt, ap)
 {
 	int ret;
 	FILE f;
+	int on;
 
-	if (n == 0)
-		return (0);
-	if (--n > INT_MAX)
+	on = n;
+	if (n > 0)
+		n--;
+	if (n > INT_MAX)
 		return (EOF);
 	f._file = -1;
 	f._flags = __SWR | __SSTR;
 	f._bf._base = f._p = (unsigned char *)str;
 	f._bf._size = f._w = n;
 	ret = vfprintf(&f, fmt, ap);
-	*f._p = 0;
-	return (ret > (int)n ? n : ret);
+	if (on > 0)
+		*f._p = '\0';
+	return (ret);
 }