Merge fixes for bug 2603 and bug 3123.
/* SSCANF.C
*
* Portions Copyright (c) 1990-2006 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
*/
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<scanf>>, <<fscanf>>, <<sscanf>>---scan and format input
INDEX
scanf
INDEX
fscanf
INDEX
sscanf
ANSI_SYNOPSIS
#include <stdio.h>
int scanf(const char *<[format]> [, <[arg]>, ...]);
int fscanf(FILE *<[fd]>, const char *<[format]> [, <[arg]>, ...]);
int sscanf(const char *<[str]>, const char *<[format]>
[, <[arg]>, ...]);
TRAD_SYNOPSIS
#include <stdio.h>
int scanf(<[format]> [, <[arg]>, ...])
char *<[format]>;
int fscanf(<[fd]>, <[format]> [, <[arg]>, ...]);
FILE *<[fd]>;
char *<[format]>;
int sscanf(<[str]>, <[format]> [, <[arg]>, ...]);
char *<[str]>;
char *<[format]>;
DESCRIPTION
<<scanf>> scans a series of input fields from standard input,
one character at a time. Each field is interpreted according to
a format specifier passed to <<scanf>> in the format string at
<<*<[format]>>>. <<scanf>> stores the interpreted input from
each field at the address passed to it as the corresponding argument
following <[format]>. You must supply the same number of
format specifiers and address arguments as there are input fields.
There must be sufficient address arguments for the given format
specifiers; if not the results are unpredictable and likely
disasterous. Excess address arguments are merely ignored.
<<scanf>> often produces unexpected results if the input diverges from
an expected pattern. Since the combination of <<gets>> or <<fgets>>
followed by <<sscanf>> is safe and easy, that is the preferred way
to be certain that a program is synchronized with input at the end
of a line.
<<fscanf>> and <<sscanf>> are identical to <<scanf>>, other than the
source of input: <<fscanf>> reads from a file, and <<sscanf>>
from a string.
The string at <<*<[format]>>> is a character sequence composed
of zero or more directives. Directives are composed of
one or more whitespace characters, non-whitespace characters,
and format specifications.
Whitespace characters are blank (<< >>), tab (<<\t>>), or
newline (<<\n>>).
When <<scanf>> encounters a whitespace character in the format string
it will read (but not store) all consecutive whitespace characters
up to the next non-whitespace character in the input.
Non-whitespace characters are all other ASCII characters except the
percent sign (<<%>>). When <<scanf>> encounters a non-whitespace
character in the format string it will read, but not store
a matching non-whitespace character.
Format specifications tell <<scanf>> to read and convert characters
from the input field into specific types of values, and store then
in the locations specified by the address arguments.
Trailing whitespace is left unread unless explicitly
matched in the format string.
The format specifiers must begin with a percent sign (<<%>>)
and have the following form:
. %[*][<[width]>][<[size]>]<[type]>
Each format specification begins with the percent character (<<%>>).
The other fields are:
o+
o *
an optional marker; if present, it suppresses interpretation and
assignment of this input field.
o <[width]>
an optional maximum field width: a decimal integer,
which controls the maximum number of characters that
will be read before converting the current input field. If the
input field has fewer than <[width]> characters, <<scanf>>
reads all the characters in the field, and then
proceeds with the next field and its format specification.
If a whitespace or a non-convertable character occurs
before <[width]> character are read, the characters up
to that character are read, converted, and stored.
Then <<scanf>> proceeds to the next format specification.
o size
<<h>>, <<l>>, and <<L>> are optional size characters which
override the default way that <<scanf>> interprets the
data type of the corresponding argument.
.Modifier Type(s)
. h d, i, o, u, x convert input to short,
. store in short object
.
. h D, I, O, U, X no effect
. e, f, c, s, n, p
.
. l d, i, o, u, x convert input to long,
. store in long object
.
. l e, f, g convert input to double
. store in a double object
.
. l D, I, O, U, X no effect
. c, s, n, p
.
. L d, i, o, u, x convert to long double,
. store in long double
.
. L all others no effect
o <[type]>
A character to specify what kind of conversion
<<scanf>> performs. Here is a table of the conversion
characters:
o+
o %
No conversion is done; the percent character (<<%>>) is stored.
o c
Scans one character. Corresponding <[arg]>: <<(char *arg)>>.
o s
Reads a character string into the array supplied.
Corresponding <[arg]>: <<(char arg[])>>.
o [<[pattern]>]
Reads a non-empty character string into memory
starting at <[arg]>. This area must be large
enough to accept the sequence and a
terminating null character which will be added
automatically. (<[pattern]> is discussed in the paragraph following
this table). Corresponding <[arg]>: <<(char *arg)>>.
o d
Reads a decimal integer into the corresponding <[arg]>: <<(int *arg)>>.
o D
Reads a decimal integer into the corresponding
<[arg]>: <<(long *arg)>>.
o o
Reads an octal integer into the corresponding <[arg]>: <<(int *arg)>>.
o O
Reads an octal integer into the corresponding <[arg]>: <<(long *arg)>>.
o u
Reads an unsigned decimal integer into the corresponding
<[arg]>: <<(unsigned int *arg)>>.
o U
Reads an unsigned decimal integer into the corresponding <[arg]>:
<<(unsigned long *arg)>>.
o x,X
Read a hexadecimal integer into the corresponding <[arg]>:
<<(int *arg)>>.
o e, f, g
Read a floating point number into the corresponding <[arg]>:
<<(float *arg)>>.
o E, F, G
Read a floating point number into the corresponding <[arg]>:
<<(double *arg)>>.
o i
Reads a decimal, octal or hexadecimal integer into the
corresponding <[arg]>: <<(int *arg)>>.
o I
Reads a decimal, octal or hexadecimal integer into the
corresponding <[arg]>: <<(long *arg)>>.
o n
Stores the number of characters read in the corresponding
<[arg]>: <<(int *arg)>>.
o p
Stores a scanned pointer. ANSI C leaves the details
to each implementation; this implementation treats
<<%p>> exactly the same as <<%U>>. Corresponding
<[arg]>: <<(void **arg)>>.
o-
A <[pattern]> of characters surrounded by square brackets can be used
instead of the <<s>> type character. <[pattern]> is a set of
characters which define a search set of possible characters making up
the <<scanf>> input field. If the first character in the brackets is a
caret (<<^>>), the search set is inverted to include all ASCII characters
except those between the brackets. There is also a range facility
which you can use as a shortcut. <<%[0-9] >> matches all decimal digits.
The hyphen must not be the first or last character in the set.
The character prior to the hyphen must be lexically less than the
character after it.
Here are some <[pattern]> examples:
o+
o %[abcd]
matches strings containing only <<a>>, <<b>>, <<c>>, and <<d>>.
o %[^abcd]
matches strings containing any characters except <<a>>, <<b>>,
<<c>>, or <<d>>
o %[A-DW-Z]
matches strings containing <<A>>, <<B>>, <<C>>, <<D>>, <<W>>,
<<X>>, <<Y>>, <<Z>>
o %[z-a]
matches the characters <<z>>, <<->>, and <<a>>
o-
Floating point numbers (for field types <<e>>, <<f>>, <<g>>, <<E>>,
<<F>>, <<G>>) must correspond to the following general form:
. [+/-] ddddd[.]ddd [E|e[+|-]ddd]
where objects inclosed in square brackets are optional, and <<ddd>>
represents decimal, octal, or hexadecimal digits.
o-
RETURNS
<<scanf>> returns the number of input fields successfully
scanned, converted and stored; the return value does
not include scanned fields which were not stored.
If <<scanf>> attempts to read at end-of-file, the return
value is <<EOF>>.
If no fields were stored, the return value is <<0>>.
<<scanf>> might stop scanning a particular field before
reaching the normal field end character, or may
terminate entirely.
<<scanf>> stops scanning and storing the current field
and moves to the next input field (if any)
in any of the following situations:
O+
o The assignment suppressing character (<<*>>) appears
after the <<%>> in the format specification; the current
input field is scanned but not stored.
o <[width]> characters have been read (<[width]> is a
width specification, a positive decimal integer).
o The next character read cannot be converted
under the the current format (for example,
if a <<Z>> is read when the format is decimal).
o The next character in the input field does not appear
in the search set (or does appear in the inverted search set).
O-
When <<scanf>> stops scanning the current input field for one of
these reasons, the next character is considered unread and
used as the first character of the following input field, or the
first character in a subsequent read operation on the input.
<<scanf>> will terminate under the following circumstances:
O+
o The next character in the input field conflicts
with a corresponding non-whitespace character in the
format string.
o The next character in the input field is <<EOF>>.
o The format string has been exhausted.
O-
When the format string contains a character sequence that is
not part of a format specification, the same character
sequence must appear in the input; <<scanf>> will
scan but not store the matched characters. If a
conflict occurs, the first conflicting character remains in the input
as if it had never been read.
PORTABILITY
<<scanf>> is ANSI C.
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
*/
#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "LOCAL.H"
static
int
eofread (void* cookie,char *buf,int len)
{
cookie=cookie;
buf=buf;
len=len;
return 0;
}
/**
Read formatted data from string.
Reads data from the buffer specified and stores it
into the locations given by argument(s).
Locations pointed by each argument are filled with their corresponding type
of value requested in the format string.
@param str Buffer containing the string to be parsed for data.
@param fmt String that can contain one or more of these items:
Whitespace characters: the function will read and ignore any whitespace
characters (this includes blank, newline and tab characters) encountered
before the next non-whitespace character. This includes any quantity of
whitespace characters (including none). On-whitespace characters (any
character not including blank, newline, tab, or any format specifier
begining with % character): this cause that the function read and discard
any character that match the given non-whitespace character. If this
character is not found the function ends returning error.
Format specifiers: A sequence of characters begining with '%' indicates
that next data has to be readed and stored at the location pointed by its
corresponding argument with a given format that is specified following this
prototype: %[*][width][modifiers]type
@return On Success, The number of items succesfully read. This count doesn't include any
ignored fields.
On Failure, returns EOF, if an error has occurred before the first assignation
could be done and errno may be set.
*/
EXPORT_C int sscanf(const char *str, const char *fmt, ...)
{
int ret;
va_list ap;
FILE f;
f._data = _REENT2;
if (!f._data)
return EOF; // Memory for library globals is not allocated (errno not set).
f._flags = __SRD;
f._bf._base = f._p = (unsigned char *) str;
f._bf._size = f._r = strlen (str);
f._read = eofread;
f._ub._base = NULL;
f._lb._base = NULL;
va_start (ap, fmt);
ret = __svfscanf (&f, fmt, ap);
va_end (ap);
return ret;
}