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#include "q3cstring.h"

#include "qregexp.h"

#include "qdatastream.h"

#include <stdio.h>

#include <stdarg.h>

#include <stdlib.h>

#include <ctype.h>

#include <limits.h>

QT_BEGIN_NAMESPACE

/*****************************************************************************

  Q3CString member functions

 *****************************************************************************/

/*!

    \class Q3CString

    \reentrant

    \brief The Q3CString class provides an abstraction of the classic C

    zero-terminated char array (char *).

    \compat

    Q3CString tries to behave like a more convenient \c{const char *}.

    The price of doing this is that some algorithms will perform

    badly. For example, append() is O(length()) since it scans for a

    null terminator. Although you might use Q3CString for text that is

    never exposed to the user, for most purposes, and especially for

    user-visible text, you should use QString. QString provides

    implicit sharing, Unicode and other internationalization support,

    and is well optimized.

    Note that for the Q3CString methods that take a \c{const char *}

    parameter the \c{const char *} must either be 0 (null) or not-null

    and '\0' (NUL byte) terminated; otherwise the results are

    undefined.

    A default constructed Q3CString is \e null, i.e. both the length

    and the data pointer are 0 and isNull() returns true.

    \note However, if you ask for the data pointer of a null Q3CString

    by calling data(), then because the internal representation of the

    null Q3CString is shared, it will be detached and replaced with a

    non-shared, empty representation, a non-null data pointer will be

    returned, and subsequent calls to isNull() will return false. But

    if you ask for the data pointer of a null Q3CString by calling

    constData(), the shared internal representation is not detached, a

    null data pointer is returned, and subsequent calls to isNull()

    will continue to return true.

    A Q3CString that references the empty string ("", a single '\0'

    char) is \e empty, i.e. isEmpty() returns true.  Both null and

    empty Q3CStrings are legal parameters to the methods.  Assigning

    \c{const char *} 0 to Q3CString produces a null Q3CString.

    The length() function returns the length of the string; resize()

    resizes the string and truncate() truncates the string. A string

    can be filled with a character using fill(). Strings can be left

    or right padded with characters using leftJustify() and

    rightJustify(). Characters, strings and regular expressions can be

    searched for using find() and findRev(), and counted using

    contains().

    Strings and characters can be inserted with insert() and appended

    with append(). A string can be prepended with prepend().

    Characters can be removed from the string with remove() and

    replaced with replace().

    Portions of a string can be extracted using left(), right() and

    mid(). Whitespace can be removed using stripWhiteSpace() and

    simplifyWhiteSpace(). Strings can be converted to uppercase or

    lowercase with upper() and lower() respectively.

    Strings that contain numbers can be converted to numbers with

    toShort(), toInt(), toLong(), toULong(), toFloat() and toDouble().

    Numbers can be converted to strings with setNum().

    Many operators are overloaded to work with Q3CStrings. Q3CString

    also supports some more obscure functions, e.g. sprintf(),

    setStr() and setExpand().

    \sidebar Note on Character Comparisons

    In Q3CString the notion of uppercase and lowercase and of which

    character is greater than or less than another character is locale

    dependent. This affects functions which support a case insensitive

    option or which compare or lowercase or uppercase their arguments.

    Case insensitive operations and comparisons will be accurate if

    both strings contain only ASCII characters. (If \c $LC_CTYPE is

    set, most Unix systems do "the right thing".) Functions that this

    affects include contains(), find(), findRev(), \l operator<(), \l

    operator<=(), \l operator>(), \l operator>=(), lower() and

    upper().

    This issue does not apply to \l{QString}s since they represent

    characters using Unicode.

    \endsidebar

    Performance note: The Q3CString methods for QRegExp searching are

    implemented by converting the Q3CString to a QString and performing

    the search on that. This implies a deep copy of the Q3CString data.

    If you are going to perform many QRegExp searches on a large

    Q3CString, you will get better performance by converting the

    Q3CString to a QString yourself, and then searching in the QString.

*/

/*!

    \fn Q3CString Q3CString::left(uint len)  const

    \internal

*/

/*!

    \fn Q3CString Q3CString::right(uint len) const

    \internal

*/

/*!

    \fn Q3CString Q3CString::mid(uint index, uint len) const

    \internal

*/

/*!

    \fn Q3CString  Q3CString::lower() const

    Use QByteArray::toLower() instead.

*/

/*!

    \fn Q3CString  Q3CString::upper() const

    Use QByteArray::toUpper() instead.

*/

/*!

    \fn Q3CString  Q3CString::stripWhiteSpace() const

    Use QByteArray::trimmed() instead.

*/

/*!

    \fn Q3CString  Q3CString::simplifyWhiteSpace() const

    Use QByteArray::simplified() instead.

*/

/*!

    \fn Q3CString& Q3CString::insert(uint index, const char *c)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::insert(uint index, char c)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::prepend(const char *c)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::remove(uint index, uint len)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(uint index, uint len, const char *c)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(char c, const Q3CString &after)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(char c, const char *after)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(const Q3CString &b, const Q3CString &a)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(const char *b, const char *a)

    \internal

*/

/*!

    \fn Q3CString& Q3CString::replace(char b, char a)

    \internal

*/

/*!

    \fn Q3CString::Q3CString()

    Constructs a null string.

    \sa isNull()

*/

/*!

    \fn Q3CString::Q3CString(const QByteArray &ba)

    Constructs a copy of \a ba.

*/

/*!

    \fn Q3CString::Q3CString(const Q3CString &s)

    Constructs a shallow copy \a s.

*/

/*! \fn Q3CString::Q3CString(int size)

    Constructs a string with room for \a size characters, including

    the '\0'-terminator. Makes a null string if \a size == 0.

    If \a size \> 0, then the first and last characters in the string

    are initialized to '\0'. All other characters are uninitialized.

    \sa resize(), isNull()

*/

/*! \fn Q3CString::Q3CString(const char *str)

    Constructs a string that is a deep copy of \a str.

    If \a str is 0 a null string is created.

    \sa isNull()

*/

/*! \fn Q3CString::Q3CString(const char *str, uint maxsize)

    Constructs a string that is a deep copy of \a str. The copy will

    be at most \a maxsize bytes long including the '\0'-terminator.

    Example:

    \snippet doc/src/snippets/code/src_qt3support_tools_q3cstring.cpp 0

    If \a str contains a 0 byte within the first \a maxsize bytes, the

    resulting Q3CString will be terminated by this 0. If \a str is 0 a

    null string is created.

    \sa isNull()

*/

/*!

    \fn Q3CString &Q3CString::operator=(const QByteArray &ba)

    Assigns byte array \a ba to this Q3CString.

*/

/*!

    \fn Q3CString &Q3CString::operator=(const Q3CString &s)

    Assigns a shallow copy of \a s to this string and returns a

    reference to this string.

*/

/*!

    \fn Q3CString &Q3CString::operator=(const char *str)

    \overload

    Assigns a deep copy of \a str to this string and returns a

    reference to this string.

    If \a str is 0 a null string is created.

    \sa isNull()

*/

/*

    \fn bool Q3CString::isNull() const

    Returns true if the string is null, i.e. if data() == 0; otherwise

    returns false. A null string is also an empty string.

    \note If you ask for the data pointer of a null Q3CString by

    calling data(), then because the internal representation of the

    null Q3CString is shared, it will be detached and replaced with a

    non-shared, empty representation, a non-null data pointer will be

    returned, and subsequent calls to isNull() will return false. But

    if you ask for the data pointer of a null Q3CString by calling

    constData(), the shared internal representation is not detached, a

    null data pointer is returned, and subsequent calls to isNull()

    will continue to return true.

    Example:

    \snippet doc/src/snippets/code/src.qt3support.tools.q3cstring.cpp 1

    \sa isEmpty(), length(), size()

*/

/*

    \fn bool Q3CString::isEmpty() const

    Returns true if the string is empty, i.e. if length() == 0;

    otherwise returns false. An empty string is not always a null

    string.

    See example in isNull().

    \sa isNull(), length(), size()

*/

/*

    \fn uint Q3CString::length() const

    Returns the length of the string, excluding the '\0'-terminator.

    Equivalent to calling \c strlen(data()).

    Null strings and empty strings have zero length.

    \sa size(), isNull(), isEmpty()

*/

/*

    \fn bool Q3CString::truncate(uint pos)

    Truncates the string at position \a pos.

    Equivalent to calling \c resize(pos+1).

    Example:

    \snippet doc/src/snippets/code/src.qt3support.tools.q3cstring.cpp 2

    \sa resize()

*/

/*!

    Implemented as a call to the native vsprintf() (see the manual for

    your C library).

    If the string is shorter than 256 characters, this sprintf() calls

    resize(256) to decrease the chance of memory corruption. The

    string is resized back to its actual length before sprintf()

    returns.

    Example:

    \snippet doc/src/snippets/code/src_qt3support_tools_q3cstring.cpp 3

    \warning All vsprintf() implementations will write past the end of

    the target string (*this) if the \a format specification and

    arguments happen to be longer than the target string, and some

    will also fail if the target string is longer than some arbitrary

    implementation limit.

    Giving user-supplied arguments to sprintf() is risky: Sooner or

    later someone will paste a huge line into your application.

*/

Q3CString &Q3CString::sprintf(const char *format, ...)

{

    detach();

    va_list ap;

    va_start(ap, format);

    if (size() < 256)

        resize(256);                // make string big enough

    qvsnprintf(data(), size(), format, ap);

    resize(qstrlen(constData()));

    va_end(ap);

    return *this;

}

/*!

    \fn Q3CString Q3CString::copy() const

    Returns a deep copy of this string.

*/

/*!

    Returns a string of length \a width (plus one for the terminating

    '\0') that contains this string padded with the \a fill character.

    If the length of the string exceeds \a width and \a truncate is

    false (the default), then the returned string is a copy of the

    string. If the length of the string exceeds \a width and \a

    truncate is true, then the returned string is a left(\a width).

    Example:

    \snippet doc/src/snippets/code/src_qt3support_tools_q3cstring.cpp 4

    \sa rightJustify()

*/

Q3CString Q3CString::leftJustify(uint width, char fill, bool truncate) const

{

    Q3CString result;

    int len = qstrlen(constData());

    int padlen = width - len;

    if (padlen > 0) {

        result.resize(len+padlen);

        memcpy(result.data(), constData(), len);

        memset(result.data()+len, fill, padlen);

    } else {

        if (truncate)

            result = left(width);

        else

            result = *this;

    }

    return result;

}

/*!

    Returns a string of length \a width (plus one for the terminating

    '\0') that contains zero or more of the \a fill character followed

    by this string.

    If the length of the string exceeds \a width and \a truncate is

    false (the default), then the returned string is a copy of the

    string. If the length of the string exceeds \a width and \a

    truncate is true, then the returned string is a left(\a width).

    Example:

    \snippet doc/src/snippets/code/src_qt3support_tools_q3cstring.cpp 5

    \sa leftJustify()

*/

Q3CString Q3CString::rightJustify(uint width, char fill, bool truncate) const

{

    Q3CString result;

    int len = qstrlen(constData());

    int padlen = width - len;

    if (padlen > 0) {

        result.resize(len+padlen);

        memset(result.data(), fill, padlen);

        memcpy(result.data()+padlen, constData(), len);

    } else {

        if (truncate)

            result = left(width);

        else

            result = *this;

    }

    return result;

}

/*!

    Returns the string converted to a \c long value.

    If \a ok is not 0: *\a ok is set to false if the string is not a

    number, or if it has trailing garbage; otherwise *\a ok is set to

    true.

*/

long Q3CString::toLong(bool *ok) const

{

    const char *p = constData();

    long val=0;

    const long max_mult = 214748364;

    bool is_ok = false;

    int neg = 0;

    if (!p)

        goto bye;

    while (isspace((uchar) *p))                // skip leading space

        p++;

    if (*p == '-') {

        p++;

        neg = 1;

    } else if (*p == '+') {

        p++;

    }

    if (!isdigit((uchar) *p))

        goto bye;

    while (isdigit((uchar) *p)) {