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Fix snprintf(...%n...)

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to pass not more than buffer size to %n agrument, old variant
always assume infinite buffer.
%n is for actually transmitted characters, not for planned ones.
This commit is contained in:
ache 1997-12-24 13:47:13 +00:00
parent 4838495a16
commit e73e3ecc2a
1 changed files with 9 additions and 5 deletions
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14
lib/libc/stdio/vfprintf.c
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@ -39,7 +39,7 @@
static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
"$Id: vfprintf.c,v 1.12 1997/02/22 15:02:40 peter Exp $";
"$Id: vfprintf.c,v 1.13 1997/12/19 21:59:22 bde Exp $";
#endif /* LIBC_SCCS and not lint */
/*
@ -643,14 +643,18 @@ 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 *) = ret;
*GETARG(quad_t *) = n;
else if (flags & LONGINT)
*GETARG(long *) = ret;
*GETARG(long *) = n;
else if (flags & SHORTINT)
*GETARG(short *) = ret;
*GETARG(short *) = n;
else
*GETARG(int *) = ret;
*GETARG(int *) = n;
continue; /* no output */
case 'O':
flags |= LONGINT;