942 lines
26 KiB
C
942 lines
26 KiB
C
/****************************************************************************
|
|
* libc/stdio/lib_sscanf.c
|
|
*
|
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* Copyright (C) 2007, 2008, 2011-2014, 2016 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
|
|
* 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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|
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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 <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <debug.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
|
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|
#define MAXLN 128
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|
|
|
#ifndef MIN
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# define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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|
|
|
#ifndef MAX
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# define MAX(a,b) (((a) > (b)) ? (a) : (b))
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#endif
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|
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|
/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
|
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int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap);
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|
|
/****************************************************************************
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* Private 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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* Name: findwidth
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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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|
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static int findwidth(FAR const char *buf, FAR const char *fmt)
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|
{
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#if 0 /* Behavior no longer supported */
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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 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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|
{
|
|
/* If so we will say that the string ends there if we can find that
|
|
* delimiter in the input string.
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|
*/
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|
|
|
FAR const char *ptr = strchr(buf, *next);
|
|
if (ptr != NULL)
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|
{
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|
return (int)(ptr - buf);
|
|
}
|
|
}
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|
|
|
/* No... the format has no delimiter and is back-to-back with the next
|
|
* format (or is followed by a delimiter that does not exist in the
|
|
* 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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|
*
|
|
* NOTE: This means that values from the following format may be
|
|
* 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 fieldwidth, no space
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* separating the input, and no usable delimiter character.
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|
*/
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#endif
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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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}
|
|
|
|
/****************************************************************************
|
|
* Name: findscanset
|
|
*
|
|
* Description:
|
|
* Fill in the given table from the scanset at the given format.
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* Return a pointer to the character the closing ']'.
|
|
* The table has a 1 wherever characters should be considered part of the
|
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* scanset.
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*
|
|
* Function findscanset based on source function __sccl of FreeBSD
|
|
* (https://github.com/lattera/freebsd/blob/master/sys/kern/subr_scanf.c)
|
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*
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****************************************************************************/
|
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#ifdef CONFIG_LIBC_SCANSET
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static FAR const char *findscanset(FAR const char *fmt,
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FAR unsigned char set[32])
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|
{
|
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int c;
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int n;
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|
int v;
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int i;
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|
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fmt++; /* Skip '[' */
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|
|
/* First `clear' the whole table */
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|
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c = *fmt++; /* First char hat => negated scanset */
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if (c == '^')
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{
|
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v = 1; /* Default => accept */
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|
c = *fmt++; /* Get new first char */
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|
}
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|
else
|
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{
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|
v = 0; /* Default => reject */
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}
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|
|
|
memset(set, 0, 32);
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if (c == 0)
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{
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goto doexit;
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}
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|
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/* Now set the entries corresponding to the actual scanset
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* to the opposite of the above.
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*
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* The first character may be ']' (or '-') without being special;
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* the last character may be '-'.
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*/
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for (;;)
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{
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set[c / 8] |= (1 << (c % 8)); /* Take character c */
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doswitch:
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n = *fmt++; /* Examine the next */
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switch (n)
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{
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case 0: /* Format ended too soon */
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case ']': /* End of scanset */
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goto doexit;
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case '-':
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/* A scanset of the form
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*
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* [01+-]
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*
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* is defined as "the digit 0, the digit 1, the character +, the
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* character -", but the effect of a scanset such as
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*
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* [a-zA-Z0-9]
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*
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* is implementation defined. The V7 Unix scanf treats "a-z" as
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* "the letters a through z", but treats "a-a" as "the letter a,
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* the character -, and the letter a".
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*
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* For compatibility, the `-' is not considerd to define a range
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* if the character following it is either a close bracket
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* (required by ANSI) or is not numerically greater than the
|
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* character* we just stored in the table (c).
|
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*/
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n = *fmt;
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if (n == ']' || n < c)
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{
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c = '-';
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|
break; /* Resume the for(;;) */
|
|
}
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|
|
|
fmt++;
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do
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{
|
|
/* Fill in the range */
|
|
|
|
c++;
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|
set[c / 8] |= (1 << (c % 8)); /* Take character c */
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|
}
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while (c < n);
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|
|
/* Alas, the V7 Unix scanf also treats formats such as [a-c-e] as
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* "the letters a through e". This too is permitted by the
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* standard.
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*/
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goto doswitch;
|
|
|
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default: /* Just another character */
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c = n;
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break;
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|
}
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}
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doexit:
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if (v) /* Default => accept */
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{
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|
for (i = 0; i < 32; i++) /* Invert all */
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{
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set[i] ^= 0xFF;
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}
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}
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|
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return (fmt - 1);
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}
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#endif
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/****************************************************************************
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* Name: scansetwidth
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****************************************************************************/
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#ifdef CONFIG_LIBC_SCANSET
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static int scansetwidth(FAR const char *buf,
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FAR const unsigned char set[32])
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{
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FAR const char *next = buf;
|
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int c;
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|
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while (*next)
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|
{
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|
c = *next;
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if ((set[c / 8] & (1 << (c % 8))) == 0)
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{
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break;
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|
}
|
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|
next++;
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}
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return (next - buf);
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}
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#endif
|
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|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sscanf
|
|
*
|
|
* Description:
|
|
* 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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va_list ap;
|
|
int count;
|
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va_start(ap, fmt);
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count = vsscanf((FAR const 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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|
|
/****************************************************************************
|
|
* Name: vsscanf
|
|
*
|
|
* Description:
|
|
* ANSI standard vsscanf implementation.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
|
|
{
|
|
FAR const char *bufstart;
|
|
FAR char *tv;
|
|
FAR const char *tc;
|
|
bool lflag;
|
|
bool noassign;
|
|
int count;
|
|
int width;
|
|
int fwidth;
|
|
int base = 10;
|
|
char tmp[MAXLN];
|
|
#ifdef CONFIG_LIBC_SCANSET
|
|
unsigned char set[32]; /* Bit field (256 / 8) */
|
|
#endif
|
|
|
|
linfo("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, fmt);
|
|
|
|
/* Remember the start of the input buffer. We will need this for %n
|
|
* calculations.
|
|
*/
|
|
|
|
bufstart = buf;
|
|
|
|
/* Parse the format, extracting values from the input buffer as needed */
|
|
|
|
count = 0;
|
|
width = 0;
|
|
noassign = false;
|
|
lflag = false;
|
|
|
|
/* Loop until all characters in the fmt string have been processed. We
|
|
* may have to continue loop after reaching the end the input data in
|
|
* order to handle trailing %n format specifiers.
|
|
*/
|
|
|
|
while (*fmt)
|
|
{
|
|
/* Skip over white space */
|
|
|
|
while (isspace(*fmt))
|
|
{
|
|
fmt++;
|
|
}
|
|
|
|
/* Check for a conversion specifier */
|
|
|
|
if (*fmt == '%')
|
|
{
|
|
linfo("vsscanf: Specifier found\n");
|
|
|
|
/* Check for qualifiers on the conversion specifier */
|
|
|
|
fmt++;
|
|
for (; *fmt; fmt++)
|
|
{
|
|
linfo("vsscanf: Processing %c\n", *fmt);
|
|
|
|
#ifdef CONFIG_LIBC_SCANSET
|
|
if (strchr("dibouxcsefgn[%", *fmt))
|
|
#else
|
|
if (strchr("dibouxcsefgn%", *fmt))
|
|
#endif
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (*fmt == '*')
|
|
{
|
|
noassign = true;
|
|
}
|
|
else if (*fmt == 'l' || *fmt == 'L')
|
|
{
|
|
/* NOTE: Missing check for long long ('ll') */
|
|
|
|
lflag = true;
|
|
}
|
|
else if (*fmt >= '1' && *fmt <= '9')
|
|
{
|
|
for (tc = fmt; isdigit(*fmt); fmt++);
|
|
strncpy(tmp, tc, fmt - tc);
|
|
tmp[fmt - tc] = '\0';
|
|
width = atoi(tmp);
|
|
fmt--;
|
|
}
|
|
}
|
|
|
|
/* Process %s: String conversion */
|
|
|
|
if (*fmt == 's')
|
|
{
|
|
linfo("vsscanf: Performing string conversion\n");
|
|
|
|
/* Get a pointer to the char * value. We need to do this even
|
|
* if we have reached the end of the input data in order to
|
|
* update the 'ap' variable.
|
|
*/
|
|
|
|
tv = NULL; /* To avoid warnings about begin uninitialized */
|
|
if (!noassign)
|
|
{
|
|
tv = va_arg(ap, FAR char *);
|
|
tv[0] = '\0';
|
|
}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (*buf)
|
|
{
|
|
/* Skip over white space */
|
|
|
|
while (isspace(*buf))
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* Guess a field width using some heuristics */
|
|
|
|
fwidth = findwidth(buf, fmt);
|
|
|
|
/* Use the actual field's width if 1) no fieldwidth
|
|
* specified or 2) the actual field's width is smaller
|
|
* than fieldwidth specified
|
|
*/
|
|
|
|
if (!width || fwidth < width)
|
|
{
|
|
width = fwidth;
|
|
}
|
|
|
|
width = MIN(sizeof(tmp) - 1, width);
|
|
|
|
/* Copy the string (if we are making an assignment) */
|
|
|
|
if (!noassign)
|
|
{
|
|
strncpy(tv, buf, width);
|
|
tv[width] = '\0';
|
|
count++;
|
|
}
|
|
|
|
/* Update the buffer pointer past the string in the input */
|
|
|
|
buf += width;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_LIBC_SCANSET
|
|
/* Process %[: Scanset conversion */
|
|
|
|
if (*fmt == '[')
|
|
{
|
|
linfo("vsscanf: Performing scanset conversion\n");
|
|
|
|
fmt = findscanset(fmt, set); /* find scanset */
|
|
|
|
/* Get a pointer to the char * value. We need to do this even
|
|
* if we have reached the end of the input data in order to
|
|
* update the 'ap' variable.
|
|
*/
|
|
|
|
tv = NULL; /* To avoid warnings about begin uninitialized */
|
|
if (!noassign)
|
|
{
|
|
tv = va_arg(ap, FAR char *);
|
|
tv[0] = '\0';
|
|
}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (*buf)
|
|
{
|
|
/* Skip over white space */
|
|
|
|
while (isspace(*buf))
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* Guess a field width using some heuristics */
|
|
|
|
fwidth = scansetwidth(buf, set);
|
|
|
|
/* Use the actual field's width if 1) no fieldwidth
|
|
* specified or 2) the actual field's width is smaller
|
|
* than fieldwidth specified
|
|
*/
|
|
|
|
if (!width || fwidth < width)
|
|
{
|
|
width = fwidth;
|
|
}
|
|
|
|
width = MIN(sizeof(tmp) - 1, width);
|
|
|
|
/* Copy the string (if we are making an assignment) */
|
|
|
|
if (!noassign)
|
|
{
|
|
strncpy(tv, buf, width);
|
|
tv[width] = '\0';
|
|
count++;
|
|
}
|
|
|
|
/* Update the buffer pointer past the string in the input */
|
|
|
|
buf += width;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Process %c: Character conversion */
|
|
|
|
else if (*fmt == 'c')
|
|
{
|
|
linfo("vsscanf: Performing character conversion\n");
|
|
|
|
/* Get a pointer to the char * value. We need to do this even
|
|
* if we have reached the end of the input data in order to
|
|
* update the 'ap' variable.
|
|
*/
|
|
|
|
tv = NULL; /* To avoid warnings about beign uninitialized */
|
|
if (!noassign)
|
|
{
|
|
tv = va_arg(ap, FAR char *);
|
|
tv[0] = '\0';
|
|
}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (*buf)
|
|
{
|
|
/* Was a field width specified? */
|
|
|
|
if (!width)
|
|
{
|
|
/* No, then width is this one single character */
|
|
|
|
width = 1;
|
|
}
|
|
|
|
/* Copy the character(s) (if we are making an assignment) */
|
|
|
|
if (!noassign)
|
|
{
|
|
strncpy(tv, buf, width);
|
|
tv[width] = '\0';
|
|
count++;
|
|
}
|
|
|
|
/* Update the buffer pointer past the character(s) in the
|
|
* input
|
|
*/
|
|
|
|
buf += width;
|
|
}
|
|
}
|
|
|
|
/* Process %d, %o, %b, %x, %u: Various integer conversions */
|
|
|
|
else if (strchr("dobxu", *fmt))
|
|
{
|
|
FAR long *plong = NULL;
|
|
FAR int *pint = NULL;
|
|
bool sign;
|
|
|
|
linfo("vsscanf: Performing integer conversion\n");
|
|
|
|
/* Get a pointer to the integer value. We need to do this even
|
|
* if we have reached the end of the input data in order to
|
|
* update the 'ap' variable.
|
|
*/
|
|
|
|
if (!noassign)
|
|
{
|
|
/* We have to check whether we need to return a long or an
|
|
* int.
|
|
*/
|
|
|
|
if (lflag)
|
|
{
|
|
plong = va_arg(ap, FAR long *);
|
|
*plong = 0;
|
|
}
|
|
else
|
|
{
|
|
pint = va_arg(ap, FAR int *);
|
|
*pint = 0;
|
|
}
|
|
}
|
|
|
|
/* But we only perform the data conversion if we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (*buf)
|
|
{
|
|
FAR char *endptr;
|
|
int errsave;
|
|
long tmplong;
|
|
|
|
/* Skip over any white space before the integer string */
|
|
|
|
while (isspace(*buf))
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* The base of the integer conversion depends on the
|
|
* specific conversion specification.
|
|
*/
|
|
|
|
sign = false;
|
|
switch (*fmt)
|
|
{
|
|
default:
|
|
case 'd':
|
|
sign = true;
|
|
/* FALLTHROUGH */
|
|
case 'u':
|
|
base = 10;
|
|
break;
|
|
|
|
case 'X':
|
|
case 'x':
|
|
base = 16;
|
|
break;
|
|
|
|
case 'o':
|
|
base = 8;
|
|
break;
|
|
|
|
case 'b':
|
|
base = 2;
|
|
break;
|
|
}
|
|
|
|
/* Was a field width specified? */
|
|
|
|
if (!width)
|
|
{
|
|
/* No... Guess a field width using some heuristics */
|
|
|
|
int tmpwidth = findwidth(buf, fmt);
|
|
width = MIN(sizeof(tmp) - 1, tmpwidth);
|
|
}
|
|
|
|
/* Copy the numeric string into a temporary working
|
|
* buffer.
|
|
*/
|
|
|
|
strncpy(tmp, buf, width);
|
|
tmp[width] = '\0';
|
|
|
|
linfo("vsscanf: tmp[]=\"%s\"\n", tmp);
|
|
|
|
/* Perform the integer conversion */
|
|
/* Preserve the errno value */
|
|
|
|
errsave = get_errno();
|
|
set_errno(0);
|
|
if (sign)
|
|
{
|
|
tmplong = strtol(tmp, &endptr, base);
|
|
}
|
|
else
|
|
{
|
|
tmplong = strtoul(tmp, &endptr, base);
|
|
}
|
|
|
|
/* Check if the number was successfully converted */
|
|
|
|
if (tmp == endptr || get_errno() == ERANGE)
|
|
{
|
|
return count;
|
|
}
|
|
|
|
/* Move by the actual number of characters converted */
|
|
|
|
buf += (endptr - tmp);
|
|
set_errno(errsave);
|
|
if (!noassign)
|
|
{
|
|
|
|
/* We have to check whether we need to return a long
|
|
* or an int.
|
|
*/
|
|
|
|
if (lflag)
|
|
{
|
|
linfo("vsscanf: Return %ld to 0x%p\n",
|
|
tmplong, plong);
|
|
*plong = tmplong;
|
|
}
|
|
else
|
|
{
|
|
linfo("vsscanf: Return %ld to 0x%p\n",
|
|
tmplong, pint);
|
|
*pint = (int)tmplong;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Process %a, %A, %f, %F, %e, %E, %g, and %G: Floating point
|
|
* conversions
|
|
*/
|
|
|
|
else if (strchr("aAfFeEgG", *fmt) != NULL)
|
|
{
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
FAR double *pd = NULL;
|
|
#endif
|
|
FAR float *pf = NULL;
|
|
|
|
linfo("vsscanf: Performing floating point conversion\n");
|
|
|
|
/* Get a pointer to the double value. We need to do this even
|
|
* if we have reached the end of the input data in order to
|
|
* update the 'ap' variable.
|
|
*/
|
|
|
|
if (!noassign)
|
|
{
|
|
/* We have to check whether we need to return a float or a
|
|
* double.
|
|
*/
|
|
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
if (lflag)
|
|
{
|
|
pd = va_arg(ap, FAR double *);
|
|
*pd = 0.0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
pf = va_arg(ap, FAR float *);
|
|
*pf = 0.0;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_LIBC_FLOATINGPOINT
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (*buf)
|
|
{
|
|
/* Skip over any white space before the real string */
|
|
|
|
while (isspace(*buf))
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* Was a fieldwidth specified? */
|
|
|
|
if (!width)
|
|
{
|
|
/* No... Guess a field width using some heuristics */
|
|
|
|
width = findwidth(buf, fmt);
|
|
}
|
|
|
|
/* Copy the real string into a temporary working buffer. */
|
|
|
|
strncpy(tmp, buf, width);
|
|
tmp[width] = '\0';
|
|
buf += width;
|
|
|
|
linfo("vsscanf: tmp[]=\"%s\"\n", tmp);
|
|
|
|
/* Perform the floating point conversion */
|
|
|
|
if (!noassign)
|
|
{
|
|
/* strtod always returns a double */
|
|
|
|
FAR char *endptr;
|
|
int errsave;
|
|
|
|
/* Preserve the errno value */
|
|
|
|
errsave = get_errno();
|
|
set_errno(0);
|
|
|
|
/* We have to check whether we need to return a float
|
|
* or a double.
|
|
*/
|
|
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
if (lflag)
|
|
{
|
|
/* Get the converted double value */
|
|
|
|
double dvalue = strtod(tmp, &endptr);
|
|
|
|
/* Check if the number was successfully converted */
|
|
|
|
if (tmp == endptr || get_errno() == ERANGE)
|
|
{
|
|
return count;
|
|
}
|
|
|
|
set_errno(errsave);
|
|
|
|
/* Return the double value */
|
|
|
|
linfo("vsscanf: Return %f to %p\n", dvalue, pd);
|
|
*pd = dvalue;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Get the converted float value */
|
|
|
|
float fvalue = strtof(tmp, &endptr);
|
|
|
|
/* Check if the number was successfully converted */
|
|
|
|
if (tmp == endptr || get_errno() == ERANGE)
|
|
{
|
|
return count;
|
|
}
|
|
|
|
set_errno(errsave);
|
|
|
|
/* Return the float value */
|
|
|
|
linfo("vsscanf: Return %f to %p\n", (double)fvalue, pf);
|
|
*pf = fvalue;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Process %n: Character count */
|
|
|
|
else if (*fmt == 'n')
|
|
{
|
|
linfo("vsscanf: Performing character count\n");
|
|
|
|
if (!noassign)
|
|
{
|
|
size_t nchars = (size_t)(buf - bufstart);
|
|
|
|
/* Note %n does not count as a conversion */
|
|
|
|
if (lflag)
|
|
{
|
|
FAR long *plong = va_arg(ap, FAR long *);
|
|
*plong = (long)nchars;
|
|
}
|
|
else
|
|
{
|
|
FAR int *pint = va_arg(ap, FAR int *);
|
|
*pint = (int)nchars;
|
|
}
|
|
}
|
|
}
|
|
|
|
width = 0;
|
|
noassign = false;
|
|
lflag = false;
|
|
|
|
fmt++;
|
|
}
|
|
|
|
/* It is not a conversion specifier */
|
|
|
|
else if (*buf)
|
|
{
|
|
/* Skip over any leading spaces in the input buffer */
|
|
|
|
while (isspace(*buf))
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* Skip over matching characters in the buffer and format */
|
|
|
|
if (*fmt != *buf)
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
fmt++;
|
|
buf++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* NULL terminator encountered */
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* sscanf is required to return EOF if the input ends before the first
|
|
* matching failure or conversion.
|
|
*/
|
|
|
|
return count ? count : EOF;
|
|
}
|