Instead of abusing stdio to get a signal-safe version of sprintf, provide one.
This commit is contained in:
christos
parent
e903e46b14
commit
aa781c37c2
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@ -1,4 +1,4 @@
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/* $NetBSD: fvwrite.c,v 1.16 2006/10/27 19:59:58 christos Exp $ */
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/* $NetBSD: fvwrite.c,v 1.17 2007/02/02 23:00:28 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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@ -37,7 +37,7 @@
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#if 0
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static char sccsid[] = "@(#)fvwrite.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: fvwrite.c,v 1.16 2006/10/27 19:59:58 christos Exp $");
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__RCSID("$NetBSD: fvwrite.c,v 1.17 2007/02/02 23:00:28 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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@ -56,7 +56,6 @@ __RCSID("$NetBSD: fvwrite.c,v 1.16 2006/10/27 19:59:58 christos Exp $");
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* This routine is large and unsightly, but most of the ugliness due
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* to the three different kinds of output buffering is handled here.
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*/
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/* NB: async-signal-safe when fp->_flags & __SAFE */
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int
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__sfvwrite(fp, uio)
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FILE *fp;
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@ -1,4 +1,4 @@
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/* $NetBSD: snprintf_ss.c,v 1.3 2006/11/22 17:23:25 christos Exp $ */
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/* $NetBSD: snprintf_ss.c,v 1.4 2007/02/02 23:00:28 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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@ -37,7 +37,7 @@
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#if 0
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static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: snprintf_ss.c,v 1.3 2006/11/22 17:23:25 christos Exp $");
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__RCSID("$NetBSD: snprintf_ss.c,v 1.4 2007/02/02 23:00:28 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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@ -59,32 +59,11 @@ __weak_alias(snprintf_ss,_snprintf_ss)
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int
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snprintf_ss(char *str, size_t n, char const *fmt, ...)
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{
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int ret;
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va_list ap;
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FILE f;
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struct __sfileext fext;
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unsigned char dummy[1];
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int ret;
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_DIAGASSERT(n == 0 || str != NULL);
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_DIAGASSERT(fmt != NULL);
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if ((int)n < 0) {
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errno = EINVAL;
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return (-1);
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}
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va_start(ap, fmt);
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_FILEEXT_SETUP(&f, &fext);
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f._file = -1;
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f._flags = __SWR | __SSTR | __SAFE;
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if (n == 0) {
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f._bf._base = f._p = dummy;
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f._bf._size = f._w = 0;
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} else {
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f._bf._base = f._p = (unsigned char *)str;
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f._bf._size = f._w = n - 1;
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}
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ret = __vfprintf_unlocked(&f, fmt, ap);
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*f._p = 0;
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ret = vsnprintf_ss(str, n, fmt, ap);
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va_end(ap);
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return (ret);
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return ret;
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: vfprintf.c,v 1.55 2007/01/26 00:37:30 cbiere Exp $ */
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/* $NetBSD: vfprintf.c,v 1.56 2007/02/02 23:00:28 christos Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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@ -37,7 +37,7 @@
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#if 0
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static char *sccsid = "@(#)vfprintf.c 5.50 (Berkeley) 12/16/92";
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#else
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__RCSID("$NetBSD: vfprintf.c,v 1.55 2007/01/26 00:37:30 cbiere Exp $");
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__RCSID("$NetBSD: vfprintf.c,v 1.56 2007/02/02 23:00:28 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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@ -74,7 +74,6 @@ static int __sbprintf __P((FILE *, const char *, va_list))
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* Flush out all the vectors defined by the given uio,
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* then reset it so that it can be reused.
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*/
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/* NB: async-signal-safe when fp->_flags & __SAFE */
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static int
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__sprint(fp, uio)
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FILE *fp;
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@ -207,7 +206,6 @@ vfprintf(fp, fmt0, ap)
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/* NB: async-signal-safe when fp->_flags & __SAFE */
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int
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__vfprintf_unlocked(fp, fmt0, ap)
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FILE *fp;
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@ -351,17 +349,11 @@ __vfprintf_unlocked(fp, fmt0, ap)
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*/
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for (;;) {
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cp = fmt;
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if (fp->_flags & __SAFE) {
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for (; *fmt && *fmt != '%'; fmt++)
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continue;
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n = *fmt == '%';
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} else {
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while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
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fmt += n;
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if (wc == '%') {
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fmt--;
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break;
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}
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while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
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fmt += n;
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if (wc == '%') {
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fmt--;
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break;
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}
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}
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if (fmt != cp) {
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@ -532,14 +524,6 @@ reswitch: switch (ch) {
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size = 3;
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break;
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}
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if (fp->_flags & __SAFE) {
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if (ch == 'E' || ch == 'F' || ch == 'G')
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cp = "UNK";
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else
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cp = "unk";
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size = 3;
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break;
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}
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flags |= FPT;
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if (dtoaresult)
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@ -1,4 +1,4 @@
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/* $NetBSD: vsnprintf_ss.c,v 1.2 2006/11/22 17:23:25 christos Exp $ */
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/* $NetBSD: vsnprintf_ss.c,v 1.3 2007/02/02 23:00:28 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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@ -37,15 +37,19 @@
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#if 0
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static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: vsnprintf_ss.c,v 1.2 2006/11/22 17:23:25 christos Exp $");
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__RCSID("$NetBSD: vsnprintf_ss.c,v 1.3 2007/02/02 23:00:28 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <inttypes.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <string.h>
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#include "reentrant.h"
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#include "extern.h"
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#include "local.h"
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@ -54,33 +58,436 @@ __RCSID("$NetBSD: vsnprintf_ss.c,v 1.2 2006/11/22 17:23:25 christos Exp $");
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__weak_alias(vsnprintf_ss,_vsnprintf_ss)
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#endif
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int
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vsnprintf_ss(char *str, size_t n, const char *fmt, _BSD_VA_LIST_ ap)
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{
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int ret;
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FILE f;
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struct __sfileext fext;
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unsigned char dummy[1];
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/*
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* vsnprintf_ss: scaled down version of printf(3).
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*
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* this version based on vfprintf() from libc which was derived from
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* software contributed to Berkeley by Chris Torek.
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*
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*/
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_DIAGASSERT(n == 0 || str != NULL);
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/*
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* macros for converting digits to letters and vice versa
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*/
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#define to_digit(c) ((c) - '0')
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#define is_digit(c) ((unsigned)to_digit(c) <= 9)
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#define to_char(n) (char)((n) + '0')
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/*
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* flags used during conversion.
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*/
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#define ALT 0x001 /* alternate form */
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#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
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#define LADJUST 0x004 /* left adjustment */
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#define LONGDBL 0x008 /* long double; unimplemented */
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#define LONGINT 0x010 /* long integer */
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#define QUADINT 0x020 /* quad integer */
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#define SHORTINT 0x040 /* short integer */
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#define MAXINT 0x080 /* intmax_t */
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#define PTRINT 0x100 /* intptr_t */
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#define SIZEINT 0x200 /* size_t */
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#define ZEROPAD 0x400 /* zero (as opposed to blank) pad */
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#define FPT 0x800 /* Floating point number */
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/*
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* To extend shorts properly, we need both signed and unsigned
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* argument extraction methods.
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*/
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#define SARG() \
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(flags&MAXINT ? va_arg(ap, intmax_t) : \
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flags&PTRINT ? va_arg(ap, intptr_t) : \
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flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \
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flags&QUADINT ? va_arg(ap, quad_t) : \
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flags&LONGINT ? va_arg(ap, long) : \
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flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
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(long)va_arg(ap, int))
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#define UARG() \
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(flags&MAXINT ? va_arg(ap, uintmax_t) : \
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flags&PTRINT ? va_arg(ap, uintptr_t) : \
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flags&SIZEINT ? va_arg(ap, size_t) : \
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flags&QUADINT ? va_arg(ap, u_quad_t) : \
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flags&LONGINT ? va_arg(ap, u_long) : \
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flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
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(u_long)va_arg(ap, u_int))
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#define PUTCHAR(C) do { \
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if (sbuf < tailp) \
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*sbuf++ = (C); \
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} while (/*CONSTCOND*/0)
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int
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vsnprintf_ss(char *sbuf, size_t slen, const char *fmt0, _BSD_VA_LIST_ ap)
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{
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const char *fmt; /* format string */
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int ch; /* character from fmt */
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int n; /* handy integer (short term usage) */
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char *cp; /* handy char pointer (short term usage) */
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int flags; /* flags as above */
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int ret; /* return value accumulator */
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int width; /* width from format (%8d), or 0 */
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int prec; /* precision from format (%.3d), or -1 */
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char sign; /* sign prefix (' ', '+', '-', or \0) */
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u_quad_t _uquad; /* integer arguments %[diouxX] */
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enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
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int dprec; /* a copy of prec if [diouxX], 0 otherwise */
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int realsz; /* field size expanded by dprec */
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int size; /* size of converted field or string */
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const char *xdigs; /* digits for [xX] conversion */
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char bf[128]; /* space for %c, %[diouxX] */
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char *tailp; /* tail pointer for snprintf */
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static const char xdigs_lower[16] = "0123456789abcdef";
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static const char xdigs_upper[16] = "0123456789ABCDEF";
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_DIAGASSERT(n == 0 || sbuf != NULL);
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_DIAGASSERT(fmt != NULL);
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if ((int)n < 0) {
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errno = EINVAL;
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return (-1);
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tailp = sbuf + slen;
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cp = NULL; /* XXX: shutup gcc */
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size = 0; /* XXX: shutup gcc */
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fmt = fmt0;
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ret = 0;
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xdigs = NULL; /* XXX: shut up gcc warning */
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/*
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* Scan the format for conversions (`%' character).
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*/
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for (;;) {
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while (*fmt != '%' && *fmt) {
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ret++;
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PUTCHAR(*fmt++);
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}
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if (*fmt == 0)
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goto done;
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fmt++; /* skip over '%' */
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flags = 0;
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dprec = 0;
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width = 0;
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prec = -1;
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sign = '\0';
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rflag: ch = *fmt++;
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reswitch: switch (ch) {
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case ' ':
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/*
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* ``If the space and + flags both appear, the space
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* flag will be ignored.''
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* -- ANSI X3J11
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*/
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if (!sign)
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sign = ' ';
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goto rflag;
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case '#':
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flags |= ALT;
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goto rflag;
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case '*':
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/*
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* ``A negative field width argument is taken as a
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* - flag followed by a positive field width.''
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* -- ANSI X3J11
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* They don't exclude field widths read from args.
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*/
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if ((width = va_arg(ap, int)) >= 0)
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goto rflag;
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width = -width;
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/* FALLTHROUGH */
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case '-':
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flags |= LADJUST;
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goto rflag;
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case '+':
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sign = '+';
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goto rflag;
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case '.':
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if ((ch = *fmt++) == '*') {
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n = va_arg(ap, int);
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prec = n < 0 ? -1 : n;
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goto rflag;
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}
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n = 0;
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while (is_digit(ch)) {
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n = 10 * n + to_digit(ch);
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ch = *fmt++;
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}
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prec = n < 0 ? -1 : n;
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goto reswitch;
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case '0':
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/*
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* ``Note that 0 is taken as a flag, not as the
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* beginning of a field width.''
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* -- ANSI X3J11
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*/
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flags |= ZEROPAD;
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goto rflag;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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n = 0;
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do {
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n = 10 * n + to_digit(ch);
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ch = *fmt++;
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} while (is_digit(ch));
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width = n;
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goto reswitch;
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case 'h':
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flags |= SHORTINT;
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goto rflag;
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case 'j':
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flags |= MAXINT;
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goto rflag;
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case 'l':
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if (*fmt == 'l') {
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fmt++;
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flags |= QUADINT;
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} else {
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flags |= LONGINT;
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}
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goto rflag;
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case 'q':
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flags |= QUADINT;
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goto rflag;
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case 't':
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flags |= PTRINT;
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goto rflag;
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case 'z':
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flags |= SIZEINT;
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goto rflag;
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case 'c':
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*(cp = bf) = va_arg(ap, int);
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size = 1;
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sign = '\0';
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break;
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case 'D':
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flags |= LONGINT;
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/*FALLTHROUGH*/
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case 'd':
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case 'i':
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_uquad = SARG();
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if ((quad_t)_uquad < 0) {
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_uquad = -_uquad;
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sign = '-';
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}
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base = DEC;
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goto number;
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case 'n':
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if (flags & MAXINT)
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*va_arg(ap, intmax_t *) = ret;
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else if (flags & PTRINT)
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*va_arg(ap, intptr_t *) = ret;
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else if (flags & SIZEINT)
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*va_arg(ap, ssize_t *) = ret;
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else if (flags & QUADINT)
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*va_arg(ap, quad_t *) = ret;
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else if (flags & LONGINT)
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*va_arg(ap, long *) = ret;
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else if (flags & SHORTINT)
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*va_arg(ap, short *) = ret;
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else
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*va_arg(ap, int *) = ret;
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continue; /* no output */
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case 'O':
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flags |= LONGINT;
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/*FALLTHROUGH*/
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case 'o':
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_uquad = UARG();
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base = OCT;
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goto nosign;
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case 'p':
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/*
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* ``The argument shall be a pointer to void. The
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* value of the pointer is converted to a sequence
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* of printable characters, in an implementation-
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* defined manner.''
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* -- ANSI X3J11
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*/
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/* NOSTRICT */
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_uquad = (u_long)va_arg(ap, void *);
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base = HEX;
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xdigs = xdigs_lower;
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flags |= HEXPREFIX;
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ch = 'x';
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goto nosign;
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case 's':
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if ((cp = va_arg(ap, char *)) == NULL)
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/*XXXUNCONST*/
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cp = __UNCONST("(null)");
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if (prec >= 0) {
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/*
|
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* can't use strlen; can only look for the
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* NUL in the first `prec' characters, and
|
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* strlen() will go further.
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*/
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char *p = memchr(cp, 0, (size_t)prec);
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if (p != NULL) {
|
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size = p - cp;
|
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if (size > prec)
|
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size = prec;
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} else
|
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size = prec;
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} else
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size = strlen(cp);
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sign = '\0';
|
||||
break;
|
||||
case 'U':
|
||||
flags |= LONGINT;
|
||||
/*FALLTHROUGH*/
|
||||
case 'u':
|
||||
_uquad = UARG();
|
||||
base = DEC;
|
||||
goto nosign;
|
||||
case 'X':
|
||||
xdigs = xdigs_upper;
|
||||
goto hex;
|
||||
case 'x':
|
||||
xdigs = xdigs_lower;
|
||||
hex: _uquad = UARG();
|
||||
base = HEX;
|
||||
/* leading 0x/X only if non-zero */
|
||||
if (flags & ALT && _uquad != 0)
|
||||
flags |= HEXPREFIX;
|
||||
|
||||
/* unsigned conversions */
|
||||
nosign: sign = '\0';
|
||||
/*
|
||||
* ``... diouXx conversions ... if a precision is
|
||||
* specified, the 0 flag will be ignored.''
|
||||
* -- ANSI X3J11
|
||||
*/
|
||||
number: if ((dprec = prec) >= 0)
|
||||
flags &= ~ZEROPAD;
|
||||
|
||||
/*
|
||||
* ``The result of converting a zero value with an
|
||||
* explicit precision of zero is no characters.''
|
||||
* -- ANSI X3J11
|
||||
*/
|
||||
cp = bf + sizeof(bf);
|
||||
if (_uquad != 0 || prec != 0) {
|
||||
/*
|
||||
* Unsigned mod is hard, and unsigned mod
|
||||
* by a constant is easier than that by
|
||||
* a variable; hence this switch.
|
||||
*/
|
||||
switch (base) {
|
||||
case OCT:
|
||||
do {
|
||||
*--cp = to_char(_uquad & 7);
|
||||
_uquad >>= 3;
|
||||
} while (_uquad);
|
||||
/* handle octal leading 0 */
|
||||
if (flags & ALT && *cp != '0')
|
||||
*--cp = '0';
|
||||
break;
|
||||
|
||||
case DEC:
|
||||
/* many numbers are 1 digit */
|
||||
while (_uquad >= 10) {
|
||||
*--cp = to_char(_uquad % 10);
|
||||
_uquad /= 10;
|
||||
}
|
||||
*--cp = to_char(_uquad);
|
||||
break;
|
||||
|
||||
case HEX:
|
||||
do {
|
||||
*--cp = xdigs[(size_t)_uquad & 15];
|
||||
_uquad >>= 4;
|
||||
} while (_uquad);
|
||||
break;
|
||||
|
||||
default:
|
||||
/*XXXUNCONST*/
|
||||
cp = __UNCONST("bug bad base");
|
||||
size = strlen(cp);
|
||||
goto skipsize;
|
||||
}
|
||||
}
|
||||
size = bf + sizeof(bf) - cp;
|
||||
skipsize:
|
||||
break;
|
||||
default: /* "%?" prints ?, unless ? is NUL */
|
||||
if (ch == '\0')
|
||||
goto done;
|
||||
/* pretend it was %c with argument ch */
|
||||
cp = bf;
|
||||
*cp = ch;
|
||||
size = 1;
|
||||
sign = '\0';
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* All reasonable formats wind up here. At this point, `cp'
|
||||
* points to a string which (if not flags&LADJUST) should be
|
||||
* padded out to `width' places. If flags&ZEROPAD, it should
|
||||
* first be prefixed by any sign or other prefix; otherwise,
|
||||
* it should be blank padded before the prefix is emitted.
|
||||
* After any left-hand padding and prefixing, emit zeroes
|
||||
* required by a decimal [diouxX] precision, then print the
|
||||
* string proper, then emit zeroes required by any leftover
|
||||
* floating precision; finally, if LADJUST, pad with blanks.
|
||||
*
|
||||
* Compute actual size, so we know how much to pad.
|
||||
* size excludes decimal prec; realsz includes it.
|
||||
*/
|
||||
realsz = dprec > size ? dprec : size;
|
||||
if (sign)
|
||||
realsz++;
|
||||
else if (flags & HEXPREFIX)
|
||||
realsz+= 2;
|
||||
|
||||
/* adjust ret */
|
||||
ret += width > realsz ? width : realsz;
|
||||
|
||||
/* right-adjusting blank padding */
|
||||
if ((flags & (LADJUST|ZEROPAD)) == 0) {
|
||||
n = width - realsz;
|
||||
while (n-- > 0)
|
||||
PUTCHAR(' ');
|
||||
}
|
||||
|
||||
/* prefix */
|
||||
if (sign) {
|
||||
PUTCHAR(sign);
|
||||
} else if (flags & HEXPREFIX) {
|
||||
PUTCHAR('0');
|
||||
PUTCHAR(ch);
|
||||
}
|
||||
|
||||
/* right-adjusting zero padding */
|
||||
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) {
|
||||
n = width - realsz;
|
||||
while (n-- > 0)
|
||||
PUTCHAR('0');
|
||||
}
|
||||
|
||||
/* leading zeroes from decimal precision */
|
||||
n = dprec - size;
|
||||
while (n-- > 0)
|
||||
PUTCHAR('0');
|
||||
|
||||
/* the string or number proper */
|
||||
while (size--)
|
||||
PUTCHAR(*cp++);
|
||||
/* left-adjusting padding (always blank) */
|
||||
if (flags & LADJUST) {
|
||||
n = width - realsz;
|
||||
while (n-- > 0)
|
||||
PUTCHAR(' ');
|
||||
}
|
||||
}
|
||||
|
||||
_FILEEXT_SETUP(&f, &fext);
|
||||
f._file = -1;
|
||||
f._flags = __SWR | __SSTR | __SAFE;
|
||||
if (n == 0) {
|
||||
f._bf._base = f._p = dummy;
|
||||
f._bf._size = f._w = 0;
|
||||
} else {
|
||||
f._bf._base = f._p = (unsigned char *)str;
|
||||
f._bf._size = f._w = n - 1;
|
||||
}
|
||||
ret = __vfprintf_unlocked(&f, fmt, ap);
|
||||
*f._p = 0;
|
||||
done:
|
||||
if (sbuf == tailp)
|
||||
sbuf[-1] = '\0';
|
||||
else
|
||||
*sbuf = '\0';
|
||||
return (ret);
|
||||
/* NOTREACHED */
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue