1222 lines
36 KiB
C
1222 lines
36 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_libvscanf.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <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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#include <nuttx/compiler.h>
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#include <nuttx/streams.h>
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#include "libc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* CONFIG_LIBC_LONG_LONG is not a valid selection of the compiler does not
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* support long long types.
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*/
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#ifndef CONFIG_HAVE_LONG_LONG
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# undef CONFIG_LIBC_LONG_LONG
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#endif
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#define MAXLN 128
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#define HH_MOD -2
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#define H_MOD -1
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#define NO_MOD 0
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#define L_MOD 1
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#define LL_MOD 2
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/* Support special access to CODE-space strings for Harvard architectures */
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#ifdef CONFIG_ARCH_ROMGETC
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# define fmt_char(fmt) up_romgetc(fmt)
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#else
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# define fmt_char(fmt) (*(fmt))
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: findscanset
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*
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* Description:
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* Fill in the given table from the scanset at the given format.
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* Return a pointer to the character the closing ']'.
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* The table has a 1 wherever characters should be considered part of the
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* scanset.
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*
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* Function findscanset based on source function __sccl of FreeBSD
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* (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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fmt++; /* Skip '[' */
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/* First `clear' the whole table */
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c = fmt_char(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_char(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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/* Now set the entries corresponding to the actual scanset to the opposite
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* of the above. The first character may be ']' (or '-') without being
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* special; 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_char(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 [01+-] is defined as "the digit 0, the
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* digit 1, the character +, the character -", but the effect of a
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* scanset such as [a-zA-Z0-9] is implementation defined. The V7
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* Unix scanf treats "a-z" as "the letters a through z", but treats
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* "a-a" as "the letter a, the character -, and the letter a". For
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* compatibility, the `-' is not considered to define a range if
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* the character following it is either a close bracket (required
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* by ANSI) or is not numerically greater than the character* we
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* just stored in the table (c).
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*/
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n = fmt_char(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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}
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fmt++;
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do
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{
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/* Fill in the range */
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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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return (fmt - 1);
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_vscanf
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*
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* Description:
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* Stream-oriented implementation that underlies scanf family: scanf,
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* fscanf, vfscanf, sscanf, and vsscanf
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*
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****************************************************************************/
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int lib_vscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
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FAR const IPTR char *fmt, va_list ap)
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{
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int c;
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FAR char *tv;
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FAR const char *tc;
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int modifier;
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bool noassign;
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bool conv;
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int assigncount;
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int count;
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int ngetstart;
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int width;
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int fwidth;
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int base = 10;
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char tmp[MAXLN];
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#ifdef CONFIG_HAVE_LONG_LONG
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FAR unsigned long long *plonglong = NULL;
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#endif
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FAR unsigned long *plong = NULL;
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FAR unsigned int *pint = NULL;
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FAR unsigned short *pshort = NULL;
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FAR unsigned char *pchar = NULL;
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#ifdef CONFIG_LIBC_SCANSET
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unsigned char set[32]; /* Bit field (256 / 8) */
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#endif
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/* keep this for future reference:
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* linfo("buf=\"%s\" fmt=\"%s\"\n", buf, fmt);
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*/
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/* Parse the format, extracting values from the input buffer as needed */
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assigncount = 0;
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count = 0;
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width = 0;
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conv = false;
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noassign = false;
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modifier = NO_MOD;
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ngetstart = obj->nget; /* for %n calculations */
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/* Make sure lastc is not NULL. */
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if (lastc == NULL)
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{
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lastc = &c;
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}
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/* Loop until all characters in the fmt string have been processed. We may
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* have to continue loop after reaching the end the input data in order to
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* handle trailing %n format specifiers.
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*/
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/* Get first character, we keep always the next character in c */
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c = lib_stream_getc(obj);
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while (fmt_char(fmt))
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{
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/* Skip over white spaces */
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if (isspace(fmt_char(fmt)))
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{
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while (isspace(c))
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{
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c = lib_stream_getc(obj);
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}
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}
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while (isspace(fmt_char(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_char(fmt) == '%')
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{
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linfo("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_char(fmt); fmt++)
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{
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linfo("Processing %c\n", fmt_char(fmt));
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#ifdef CONFIG_LIBC_SCANSET
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if (strchr("dibouxXcseEfFgGaAn[%", fmt_char(fmt)))
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#else
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if (strchr("dibouxXcseEfFgGaAn%", fmt_char(fmt)))
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#endif
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{
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if (fmt_char(fmt) != '%')
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{
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conv = true;
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}
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break;
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}
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if (fmt_char(fmt) == '*')
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{
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noassign = true;
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}
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else if (fmt_char(fmt) == 'l' || fmt_char(fmt) == 'L')
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{
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modifier = L_MOD;
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if (*(fmt + 1) == 'l' || *(fmt + 1) == 'L')
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{
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modifier = LL_MOD;
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fmt++;
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}
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}
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else if (fmt_char(fmt) == 'j')
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{
|
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/* Same as long long if available. Otherwise, long. */
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#ifdef CONFIG_HAVE_LONG_LONG
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modifier = LL_MOD;
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#else
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modifier = L_MOD;
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#endif
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}
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else if (fmt_char(fmt) == 'h' || fmt_char(fmt) == 'H')
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{
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modifier = H_MOD;
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if (*(fmt + 1) == 'h' || *(fmt + 1) == 'H')
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{
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modifier = HH_MOD;
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fmt++;
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}
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}
|
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else if (fmt_char(fmt) >= '1' && fmt_char(fmt) <= '9')
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{
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for (tc = fmt; isdigit(fmt_char(fmt)); fmt++)
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;
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strlcpy(tmp, tc, fmt - tc + 1);
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width = atoi(tmp);
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fmt--;
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}
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}
|
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|
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/* Process %s: String conversion */
|
|
|
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if (fmt_char(fmt) == 's')
|
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{
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linfo("Performing string conversion\n");
|
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|
|
/* Get a pointer to the char * value. We need to do this even
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* of we have reached the end of the input data in order to
|
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* update the 'ap' variable.
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*/
|
|
|
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tv = NULL; /* To avoid warnings about begin uninitialized */
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if (!noassign)
|
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{
|
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tv = va_arg(ap, FAR char *);
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tv[0] = '\0';
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}
|
|
|
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/* Skip over white space */
|
|
|
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while (isspace(c))
|
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{
|
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c = lib_stream_getc(obj);
|
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}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (c > 0)
|
|
{
|
|
/* Use the actual field's width if 1) no fieldwidth
|
|
* specified or 2) the actual field's width is smaller
|
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* than fieldwidth specified.
|
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*/
|
|
|
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fwidth = 0;
|
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while ((!width || (fwidth < width)) && (c > 0) &&
|
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!isspace(c))
|
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{
|
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if (!noassign)
|
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{
|
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tv[fwidth] = c;
|
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}
|
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fwidth++;
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c = lib_stream_getc(obj);
|
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}
|
|
|
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if (!noassign)
|
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{
|
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tv[fwidth] = '\0';
|
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assigncount++;
|
|
}
|
|
|
|
count++;
|
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}
|
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}
|
|
|
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#ifdef CONFIG_LIBC_SCANSET
|
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/* Process %[: Scanset conversion */
|
|
|
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if (fmt_char(fmt) == '[')
|
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{
|
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linfo("Performing scanset conversion\n");
|
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|
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fmt = findscanset(fmt, set); /* find scanset */
|
|
|
|
/* Get a pointer to the char * value. We need to do this even
|
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* if we have reached the end of the input data in order to
|
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* update the 'ap' variable.
|
|
*/
|
|
|
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tv = NULL; /* To avoid warnings about begin uninitialized */
|
|
if (!noassign)
|
|
{
|
|
tv = va_arg(ap, FAR char *);
|
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tv[0] = '\0';
|
|
}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (c > 0)
|
|
{
|
|
/* Use the actual field's width if 1) no fieldwidth
|
|
* specified or 2) the actual field's width is smaller
|
|
* than the fieldwidth specified.
|
|
*/
|
|
|
|
fwidth = 0;
|
|
while ((!width || (fwidth < width)) && (c > 0)
|
|
&& ((set[c / 8] & (1 << (c % 8))) != 0))
|
|
{
|
|
if (!noassign)
|
|
{
|
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tv[fwidth] = c;
|
|
}
|
|
|
|
fwidth++;
|
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c = lib_stream_getc(obj);
|
|
}
|
|
|
|
if (!fwidth)
|
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{
|
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*lastc = c;
|
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return assigncount;
|
|
}
|
|
|
|
if (!noassign)
|
|
{
|
|
tv[fwidth] = '\0';
|
|
assigncount++;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Process %c: Character conversion */
|
|
|
|
else if (fmt_char(fmt) == 'c')
|
|
{
|
|
linfo("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 being 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 (c > 0)
|
|
{
|
|
/* 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) */
|
|
|
|
fwidth = 0;
|
|
while ((fwidth < width) && c > 0)
|
|
{
|
|
if (!noassign)
|
|
{
|
|
tv[fwidth] = c;
|
|
}
|
|
|
|
fwidth++;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
|
|
if (fwidth != width)
|
|
{
|
|
*lastc = c;
|
|
return assigncount;
|
|
}
|
|
|
|
if (!noassign)
|
|
{
|
|
assigncount++;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
|
|
/* Process %d, %o, %b, %x, %u: Various integer conversions */
|
|
|
|
else if (strchr("dobxXui", fmt_char(fmt)))
|
|
{
|
|
bool sign;
|
|
|
|
linfo("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.
|
|
*/
|
|
|
|
switch (modifier)
|
|
{
|
|
case HH_MOD:
|
|
pchar = va_arg(ap, FAR unsigned char *);
|
|
*pchar = 0;
|
|
break;
|
|
|
|
case H_MOD:
|
|
pshort = va_arg(ap, FAR unsigned short *);
|
|
*pshort = 0;
|
|
break;
|
|
|
|
case NO_MOD:
|
|
pint = va_arg(ap, FAR unsigned int *);
|
|
*pint = 0;
|
|
break;
|
|
|
|
default:
|
|
case L_MOD:
|
|
plong = va_arg(ap, FAR unsigned long *);
|
|
*plong = 0;
|
|
break;
|
|
|
|
#ifdef CONFIG_HAVE_LONG_LONG
|
|
case LL_MOD:
|
|
plonglong = va_arg(ap, FAR unsigned long long *);
|
|
*plonglong = 0;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* Skip over any white space before the integer string */
|
|
|
|
while (isspace(c))
|
|
{
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
|
|
/* But we only perform the data conversion if we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (c > 0)
|
|
{
|
|
FAR char *endptr;
|
|
int prefix;
|
|
bool stopconv;
|
|
int errsave;
|
|
unsigned long tmplong = 0;
|
|
#ifdef CONFIG_HAVE_LONG_LONG
|
|
unsigned long long tmplonglong = 0;
|
|
#endif
|
|
/* Copy the real string into a temporary working buffer. */
|
|
|
|
if (!width || width > sizeof(tmp) - 1)
|
|
{
|
|
width = sizeof(tmp) - 1;
|
|
}
|
|
|
|
/* The base of the integer conversion depends on the
|
|
* specific conversion specification.
|
|
*/
|
|
|
|
fwidth = 0;
|
|
prefix = 0;
|
|
stopconv = false;
|
|
sign = false;
|
|
|
|
switch (fmt_char(fmt))
|
|
{
|
|
default:
|
|
case 'd':
|
|
sign = true;
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
case 'u':
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (fwidth != 0)
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!(c >= '0' && c <= '9'))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
base = 10;
|
|
break;
|
|
|
|
case 'x':
|
|
case 'X':
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (fwidth != 0)
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (c == '0')
|
|
{
|
|
if (prefix == 0)
|
|
{
|
|
prefix = 1;
|
|
}
|
|
}
|
|
else if (c == 'x' || c == 'X')
|
|
{
|
|
if (prefix == 1)
|
|
{
|
|
prefix = 2;
|
|
}
|
|
else
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!((c >= '0' && c <= '9') ||
|
|
(c >= 'a' && c <= 'f') ||
|
|
(c >= 'A' && c <= 'F')))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
else
|
|
{
|
|
prefix = 2;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
base = 16;
|
|
break;
|
|
|
|
case 'o':
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (fwidth != 0)
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!(c >= '0' && c <= '7'))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
base = 8;
|
|
break;
|
|
|
|
case 'b': /* not official? */
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (fwidth != 0)
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!(c >= '0' && c <= '1'))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
base = 2;
|
|
break;
|
|
|
|
case 'i':
|
|
sign = true;
|
|
base = 10;
|
|
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (fwidth != 0)
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (c == '0')
|
|
{
|
|
if (prefix == 0)
|
|
{
|
|
prefix = 1;
|
|
base = 8;
|
|
}
|
|
}
|
|
else if (c == 'x' || c == 'X')
|
|
{
|
|
if (prefix == 1)
|
|
{
|
|
prefix = 2;
|
|
base = 16;
|
|
}
|
|
else
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!((c >= '0' && c <= '7' && base >= 8) ||
|
|
(c >= '8' && c <= '9' && base >= 10) ||
|
|
(c >= 'a' && c <= 'f' && base == 16) ||
|
|
(c >= 'A' && c <= 'F' && base == 16)))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
else
|
|
{
|
|
prefix = 2;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
tmp[fwidth] = 0;
|
|
|
|
linfo("tmp[]=\"%s\"\n", tmp);
|
|
|
|
/* Perform the integer conversion */
|
|
|
|
/* Preserve the errno value */
|
|
|
|
errsave = get_errno();
|
|
set_errno(0);
|
|
|
|
switch (modifier)
|
|
{
|
|
#ifndef CONFIG_HAVE_LONG_LONG
|
|
case LL_MOD:
|
|
#endif
|
|
case HH_MOD:
|
|
case H_MOD:
|
|
case NO_MOD:
|
|
default:
|
|
if (sign)
|
|
{
|
|
tmplong = strtol(tmp, &endptr, base);
|
|
}
|
|
else
|
|
{
|
|
tmplong = strtoul(tmp, &endptr, base);
|
|
}
|
|
break;
|
|
|
|
#ifdef CONFIG_HAVE_LONG_LONG
|
|
case LL_MOD:
|
|
if (sign)
|
|
{
|
|
# ifdef CONFIG_LIBC_LONG_LONG
|
|
tmplonglong = strtoll(tmp, &endptr, base);
|
|
# else
|
|
tmplonglong = strtol(tmp, &endptr, base);
|
|
# endif
|
|
}
|
|
else
|
|
{
|
|
# ifdef CONFIG_LIBC_LONG_LONG
|
|
tmplonglong = strtoull(tmp, &endptr, base);
|
|
# else
|
|
tmplonglong = strtoul(tmp, &endptr, base);
|
|
# endif
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
/* Check if the number was successfully converted */
|
|
|
|
if (tmp == endptr || get_errno() == ERANGE)
|
|
{
|
|
*lastc = c;
|
|
return assigncount;
|
|
}
|
|
|
|
set_errno(errsave);
|
|
if (!noassign)
|
|
{
|
|
/* We have to check whether we need to return a long or
|
|
* an int.
|
|
*/
|
|
|
|
switch (modifier)
|
|
{
|
|
case HH_MOD:
|
|
linfo("Return %ld to %p\n", tmplong, pchar);
|
|
*pchar = (unsigned char)tmplong;
|
|
break;
|
|
|
|
case H_MOD:
|
|
linfo("Return %ld to %p\n", tmplong, pshort);
|
|
*pshort = (unsigned short)tmplong;
|
|
break;
|
|
|
|
case NO_MOD:
|
|
linfo("Return %ld to %p\n", tmplong, pint);
|
|
*pint = (unsigned int)tmplong;
|
|
break;
|
|
|
|
#ifndef CONFIG_HAVE_LONG_LONG
|
|
case L_MOD:
|
|
#endif
|
|
default:
|
|
linfo("Return %ld to %p\n", tmplong, plong);
|
|
*plong = tmplong;
|
|
break;
|
|
|
|
#ifdef CONFIG_HAVE_LONG_LONG
|
|
case LL_MOD:
|
|
linfo("Return %lld to %p\n", tmplonglong,
|
|
plonglong);
|
|
*plonglong = tmplonglong;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
assigncount++;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
|
|
/* Process %a, %A, %f, %F, %e, %E, %g, and %G: Floating point
|
|
* conversions.
|
|
*/
|
|
|
|
else if (strchr("aAfFeEgG", fmt_char(fmt)) != NULL)
|
|
{
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
FAR double *pd = NULL;
|
|
#endif
|
|
FAR float *pf = NULL;
|
|
|
|
linfo("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
|
|
* upate the 'ap' variable.
|
|
*/
|
|
|
|
if (!noassign)
|
|
{
|
|
/* We have to check whether we need to return a float or a
|
|
* double.
|
|
*/
|
|
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
if (modifier >= L_MOD)
|
|
{
|
|
pd = va_arg(ap, FAR double *);
|
|
*pd = 0.0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
pf = va_arg(ap, FAR float *);
|
|
*pf = 0.0;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_LIBC_FLOATINGPOINT
|
|
|
|
/* Skip over any white space before the real string */
|
|
|
|
while (isspace(c))
|
|
{
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
|
|
/* But we only perform the data conversion is we still have
|
|
* bytes remaining in the input data stream.
|
|
*/
|
|
|
|
if (c > 0)
|
|
{
|
|
FAR char *endptr;
|
|
bool expnt;
|
|
bool dot;
|
|
bool sign;
|
|
bool stopconv;
|
|
int errsave;
|
|
# ifdef CONFIG_HAVE_DOUBLE
|
|
double dvalue;
|
|
# endif
|
|
float fvalue;
|
|
|
|
/* Was a fieldwidth specified? */
|
|
|
|
if (!width || width > sizeof(tmp) - 1)
|
|
{
|
|
width = sizeof(tmp) - 1;
|
|
}
|
|
|
|
/* Copy the real string into a temporary working buffer. */
|
|
|
|
fwidth = 0;
|
|
expnt = false;
|
|
sign = false;
|
|
dot = false;
|
|
stopconv = false;
|
|
|
|
while (fwidth < width && !stopconv)
|
|
{
|
|
if (c == '-' || c == '+')
|
|
{
|
|
if (!sign)
|
|
{
|
|
sign = true;
|
|
}
|
|
else
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (c == '.')
|
|
{
|
|
if (!dot)
|
|
{
|
|
dot = true;
|
|
sign = true;
|
|
}
|
|
else
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (c == 'e' || c == 'E')
|
|
{
|
|
if (!expnt)
|
|
{
|
|
expnt = true;
|
|
sign = false;
|
|
}
|
|
else
|
|
{
|
|
stopconv = true;
|
|
}
|
|
}
|
|
else if (!(c >= '0' && c <= '9'))
|
|
{
|
|
stopconv = true;
|
|
}
|
|
else
|
|
{
|
|
sign = true;
|
|
}
|
|
|
|
if (!stopconv)
|
|
{
|
|
tmp[fwidth++] = c;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
tmp[fwidth] = 0;
|
|
|
|
linfo("tmp[]=\"%s\"\n", tmp);
|
|
|
|
/* Perform the floating point conversion */
|
|
|
|
/* Preserve the errno value */
|
|
|
|
errsave = get_errno();
|
|
set_errno(0);
|
|
|
|
# ifdef CONFIG_HAVE_DOUBLE
|
|
if (modifier >= L_MOD)
|
|
{
|
|
/* Get the converted double value */
|
|
|
|
dvalue = strtod(tmp, &endptr);
|
|
}
|
|
else
|
|
# endif
|
|
{
|
|
fvalue = strtof(tmp, &endptr);
|
|
}
|
|
|
|
/* Check if the number was successfully converted */
|
|
|
|
if (tmp == endptr || get_errno() == ERANGE)
|
|
{
|
|
*lastc = c;
|
|
return assigncount;
|
|
}
|
|
|
|
set_errno(errsave);
|
|
|
|
if (!noassign)
|
|
{
|
|
/* We have to check whether we need to return a float
|
|
* or a double.
|
|
*/
|
|
|
|
# ifdef CONFIG_HAVE_DOUBLE
|
|
if (modifier >= L_MOD)
|
|
{
|
|
/* Return the double value */
|
|
|
|
linfo("Return %f to %p\n", dvalue, pd);
|
|
*pd = dvalue;
|
|
}
|
|
else
|
|
# endif
|
|
{
|
|
/* Return the float value */
|
|
|
|
linfo("Return %f to %p\n", (double)fvalue, pf);
|
|
*pf = fvalue;
|
|
}
|
|
|
|
assigncount++;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Process %n: Character count */
|
|
|
|
else if (fmt_char(fmt) == 'n')
|
|
{
|
|
linfo("Performing character count\n");
|
|
|
|
if (!noassign)
|
|
{
|
|
size_t nchars = (size_t) (obj->nget - ngetstart);
|
|
|
|
if (c != EOF)
|
|
{
|
|
/* One more character already read */
|
|
|
|
nchars--;
|
|
}
|
|
|
|
/* Note %n does not count as a conversion */
|
|
|
|
switch (modifier)
|
|
{
|
|
case HH_MOD:
|
|
pchar = va_arg(ap, FAR unsigned char *);
|
|
*pchar = (unsigned char)nchars;
|
|
break;
|
|
|
|
case H_MOD:
|
|
pshort = va_arg(ap, FAR unsigned short *);
|
|
*pshort = (unsigned short)nchars;
|
|
break;
|
|
|
|
case NO_MOD:
|
|
pint = va_arg(ap, FAR unsigned int *);
|
|
*pint = (unsigned int)nchars;
|
|
break;
|
|
|
|
default:
|
|
case L_MOD:
|
|
plong = va_arg(ap, FAR unsigned long *);
|
|
*plong = (unsigned long)nchars;
|
|
break;
|
|
|
|
#ifdef CONFIG_HAVE_LONG_LONG
|
|
case LL_MOD:
|
|
plonglong = va_arg(ap, FAR unsigned long long *);
|
|
*plonglong = (unsigned long long)nchars;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
count++;
|
|
}
|
|
else if (fmt_char(fmt) == '%')
|
|
{
|
|
if (c != '%')
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
|
|
width = 0;
|
|
noassign = false;
|
|
modifier = NO_MOD;
|
|
|
|
fmt++;
|
|
}
|
|
|
|
/* It is not a conversion specifier */
|
|
|
|
else if (c > 0)
|
|
{
|
|
#if 0
|
|
/* Skip over any leading spaces in the input buffer */
|
|
|
|
while (isspace(c))
|
|
{
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
#endif
|
|
|
|
/* Skip over matching characters in the buffer and format */
|
|
|
|
if (fmt_char(fmt) != c)
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
fmt++;
|
|
c = lib_stream_getc(obj);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* NULL terminator encountered */
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* sscanf is required to return EOF if the input ends before the first
|
|
* matching failure or conversion.
|
|
*/
|
|
|
|
*lastc = c;
|
|
return (count || !conv) ? assigncount : EOF;
|
|
}
|