/*
 * Copyright (C) 1996-2018 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

/* DEBUG: section 67    String */

#include <cstring>

String::String() : size_(0), len_(0), buf_(NULL)
{
#if DEBUGSTRINGS
    StringRegistry::Instance().add(this);
#endif
}

String::size_type
String::size() const
{
    return len_;
}

char const *
String::rawBuf() const
{
    return buf_;
}

char const *
String::termedBuf() const
{
    return buf_;
}

char
String::operator [](unsigned int aPos) const
{
    assert(aPos < size_);

    return buf_[aPos];
}

/// compare NULL and empty strings because str*cmp() may fail on NULL strings
/// and because we need to return consistent results for strncmp(count == 0).
bool
String::nilCmp(const bool thisIsNilOrEmpty, const bool otherIsNilOrEmpty, int &result) const
{
    if (!thisIsNilOrEmpty && !otherIsNilOrEmpty)
        return false; // result does not matter

    if (thisIsNilOrEmpty && otherIsNilOrEmpty)
        result = 0;
    else if (thisIsNilOrEmpty)
        result = -1;
    else // otherIsNilOrEmpty
        result = +1;

    return true;
}

int
String::cmp(char const *aString) const
{
    int result = 0;
    if (nilCmp(!size(), (!aString || !*aString), result))
        return result;

    return strcmp(termedBuf(), aString);
}

int
String::cmp(char const *aString, String::size_type count) const
{
    int result = 0;
    if (nilCmp((!size() || !count), (!aString || !*aString || !count), result))
        return result;

    return strncmp(termedBuf(), aString, count);
}

int
String::cmp(String const &aString) const
{
    int result = 0;
    if (nilCmp(!size(), !aString.size(), result))
        return result;

    return strcmp(termedBuf(), aString.termedBuf());
}

int
String::caseCmp(char const *aString) const
{
    int result = 0;
    if (nilCmp(!size(), (!aString || !*aString), result))
        return result;

    return strcasecmp(termedBuf(), aString);
}

int
String::caseCmp(char const *aString, String::size_type count) const
{
    int result = 0;
    if (nilCmp((!size() || !count), (!aString || !*aString || !count), result))
        return result;

    return strncasecmp(termedBuf(), aString, count);
}

int
String::caseCmp(const String &str) const
{
    return caseCmp(str.rawBuf(),str.size());
}

void
String::set(char const *loc, char const ch)
{
    if (loc < buf_ || loc > (buf_ + size_) ) return;

    buf_[loc-buf_] = ch;
}

void
String::cut(String::size_type newLength)
{
    // size_type is size_t, unsigned. No need to check for newLength <0
    if (newLength > len_) return;

    len_ = newLength;

    // buf_ may be NULL on zero-length strings.
    if (len_ == 0 && buf_ == NULL) return;

    buf_[newLength] = '\0';
}

void
String::cutPointer(char const *loc)
{
    if (loc < buf_ || loc > (buf_ + size_) ) return;

    len_ = loc-buf_;
    buf_[len_] = '\0';
}

std::ostream &
operator<<(std::ostream& os, String const &aString)
{
    os.write(aString.rawBuf(),aString.size());
    return os;
}

bool
operator<(const String &a, const String &b)
{
    return a.cmp(b) < 0;
}