6239b70352
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5745 42af7a65-404d-4744-a932-0658087f49c3
513 lines
14 KiB
C
513 lines
14 KiB
C
/****************************************************************************
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* libc/stdio/lib_sscanf.c
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*
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* Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <ctype.h>
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#include <debug.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define MAXLN 128
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Function Prototypes
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****************************************************************************/
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int vsscanf(char *buf, const char *fmt, va_list ap);
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/**************************************************************************
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* Global Constant Data
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**************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/**************************************************************************
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* Private Constant Data
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**************************************************************************/
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static const char spaces[] = " \t\n\r\f\v";
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: findwidth
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*
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* Description:
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* Try to figure out the width of the input data.
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*
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****************************************************************************/
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static int findwidth(FAR const char *buf, FAR const char *fmt)
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{
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FAR const char *next = fmt + 1;
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/* No... is there a space after the format? Or does the format string end
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* here?
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*/
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if (isspace(*next) || *next == 0)
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{
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/* Use the input up until the first white space is encountered. */
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return strcspn(buf, spaces);
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}
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/* No.. Another possibility is the the format character is followed by
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* some recognizable delimiting value.
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*/
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if (*next != '%')
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{
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/* If so we will say that the string ends there if we can find that
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* delimiter in the input string.
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*/
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FAR const char *ptr = strchr(buf, *next);
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if (ptr)
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{
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return (int)(ptr - buf);
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}
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}
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/* No... the format has not delimiter and is back-to-back with the next
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* formats (or no is following by a delimiter that does not exist in the
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* input string). At this point we just bail and Use the input up until
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* the first white space is encountered.
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*
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* NOTE: This means that values from the following format may be
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* concatenated with the first. This is a bug. We have no generic way of
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* determining the width of the data if there is no fieldwith, no space
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* separating the input, and no usable delimiter character.
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*/
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return strcspn(buf, spaces);
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}
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Function: sscanf
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*
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* Description:
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* ANSI standard sscanf implementation.
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*
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****************************************************************************/
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int sscanf(FAR const char *buf, FAR const char *fmt, ...)
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{
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va_list ap;
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int count;
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va_start(ap, fmt);
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count = vsscanf((FAR char*)buf, fmt, ap);
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va_end(ap);
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return count;
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}
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/****************************************************************************
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* Function: vsscanf
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*
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* Description:
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* ANSI standard vsscanf implementation.
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*
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****************************************************************************/
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int vsscanf(FAR char *buf, FAR const char *fmt, va_list ap)
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{
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FAR char *bufstart;
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FAR char *tv;
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FAR const char *tc;
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bool lflag;
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bool noassign;
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int count;
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int width;
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int base = 10;
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char tmp[MAXLN];
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lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, fmt);
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/* Remember the start of the input buffer. We will need this for %n
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* calculations.
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*/
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bufstart = buf;
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/* Parse the format, extracting values from the input buffer as needed */
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count = 0;
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width = 0;
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noassign = false;
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lflag = false;
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/* NOTE that there is a flaw in this loop logic: The fmt string often
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* terminates with %n which would have to be processes at the end of the
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* buf string. That won't happen here.
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*/
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while (*fmt && *buf)
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{
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/* Skip over white space */
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while (isspace(*fmt))
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{
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fmt++;
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}
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/* Check for a conversion specifier */
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if (*fmt == '%')
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{
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lvdbg("vsscanf: Specifier found\n");
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/* Check for qualifiers on the conversion specifier */
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fmt++;
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for (; *fmt; fmt++)
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{
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lvdbg("vsscanf: Processing %c\n", *fmt);
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if (strchr("dibouxcsefgn%", *fmt))
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{
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break;
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}
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if (*fmt == '*')
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{
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noassign = true;
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}
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else if (*fmt == 'l' || *fmt == 'L')
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{
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/* NOTE: Missing check for long long ('ll') */
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lflag = true;
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}
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else if (*fmt >= '1' && *fmt <= '9')
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{
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for (tc = fmt; isdigit(*fmt); fmt++);
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strncpy(tmp, tc, fmt - tc);
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tmp[fmt - tc] = '\0';
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width = atoi(tmp);
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fmt--;
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}
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}
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/* Process %s: String conversion */
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if (*fmt == 's')
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{
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lvdbg("vsscanf: Performing string conversion\n");
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while (isspace(*buf))
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{
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buf++;
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}
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/* Was a fieldwidth specified? */
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if (!width)
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{
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/* No... Guess a field width using some heuristics */
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width = findwidth(buf, fmt);
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}
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if (!noassign)
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{
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tv = va_arg(ap, char*);
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strncpy(tv, buf, width);
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tv[width] = '\0';
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}
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buf += width;
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}
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/* Process %c: Character conversion */
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else if (*fmt == 'c')
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{
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lvdbg("vsscanf: Performing character conversion\n");
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/* Was a fieldwidth specified? */
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if (!width)
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{
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/* No, then width is this one single character */
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width = 1;
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}
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if (!noassign)
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{
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tv = va_arg(ap, char*);
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strncpy(tv, buf, width);
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tv[width] = '\0';
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}
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buf += width;
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}
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/* Process %d, %o, %b, %x, %u: Various integer conversions */
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else if (strchr("dobxu", *fmt))
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{
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lvdbg("vsscanf: Performing integer conversion\n");
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/* Skip over any white space before the integer string */
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while (isspace(*buf))
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{
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buf++;
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}
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/* The base of the integer conversion depends on the specific
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* conversion specification.
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*/
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if (*fmt == 'd' || *fmt == 'u')
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{
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base = 10;
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}
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else if (*fmt == 'x')
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{
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base = 16;
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}
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else if (*fmt == 'o')
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{
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base = 8;
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}
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else if (*fmt == 'b')
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{
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base = 2;
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}
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/* Was a fieldwidth specified? */
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if (!width)
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{
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/* No... Guess a field width using some heuristics */
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width = findwidth(buf, fmt);
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}
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/* Copy the numeric string into a temporary working buffer. */
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strncpy(tmp, buf, width);
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tmp[width] = '\0';
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lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp);
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/* Perform the integer conversion */
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buf += width;
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if (!noassign)
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{
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#ifdef SDCC
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char *endptr;
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long tmplong = strtol(tmp, &endptr, base);
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#else
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long tmplong = strtol(tmp, NULL, base);
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#endif
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if (lflag)
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{
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long *plong = va_arg(ap, long*);
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lvdbg("vsscanf: Return %ld to 0x%p\n", tmplong, plong);
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*plong = tmplong;
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}
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else
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{
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int *pint = va_arg(ap, int*);
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lvdbg("vsscanf: Return %ld to 0x%p\n", tmplong, pint);
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*pint = (int)tmplong;
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}
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}
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}
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/* Process %f: Floating point conversion */
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else if (*fmt == 'f')
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{
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#ifndef CONFIG_LIBC_FLOATINGPOINT
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/* No floating point conversions */
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void *pv = va_arg(ap, void*);
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lvdbg("vsscanf: Return 0.0 to %p\n", pv);
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*((double_t*)pv) = 0.0;
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#else
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lvdbg("vsscanf: Performing floating point conversion\n");
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/* Skip over any white space before the real string */
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while (isspace(*buf))
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{
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buf++;
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}
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/* Was a fieldwidth specified? */
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if (!width)
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{
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/* No... Guess a field width using some heuristics */
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width = findwidth(buf, fmt);
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}
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/* Copy the real string into a temporary working buffer. */
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strncpy(tmp, buf, width);
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tmp[width] = '\0';
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buf += width;
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lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp);
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/* Perform the floating point conversion */
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if (!noassign)
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{
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/* strtod always returns a double */
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#ifdef SDCC
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char *endptr;
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double_t dvalue = strtod(tmp,&endptr);
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#else
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double_t dvalue = strtod(tmp, NULL);
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#endif
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void *pv = va_arg(ap, void*);
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lvdbg("vsscanf: Return %f to %p\n", dvalue, pv);
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/* But we have to check whether we need to return a
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* float or a double.
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*/
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#ifdef CONFIG_HAVE_DOUBLE
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if (lflag)
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{
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*((double_t*)pv) = dvalue;
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}
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else
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#endif
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{
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*((float*)pv) = (float)dvalue;
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}
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}
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#endif
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}
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/* Process %n: Character count */
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else if (*fmt == 'n')
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{
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lvdbg("vsscanf: Performing character count\n");
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if (!noassign)
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{
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size_t nchars = (size_t)(buf - bufstart);
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if (lflag)
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{
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long *plong = va_arg(ap, long*);
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*plong = (long)nchars;
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}
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else
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{
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int *pint = va_arg(ap, int*);
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*pint = (int)nchars;
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}
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}
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}
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/* Note %n does not count as a conversion */
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if (!noassign && *fmt != 'n')
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{
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count++;
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}
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width = 0;
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noassign = false;
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lflag = false;
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fmt++;
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}
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/* Its is not a conversion specifier */
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else
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{
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while (isspace(*buf))
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{
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buf++;
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}
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if (*fmt != *buf)
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{
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break;
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}
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else
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{
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fmt++;
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buf++;
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}
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}
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}
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return count;
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}
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