X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fcommon%2Fsstring.hh;fp=src%2Fceph%2Fsrc%2Fcommon%2Fsstring.hh;h=3783cc1efac6c5c2586a69a99d00f9a54772f8e5;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/common/sstring.hh b/src/ceph/src/common/sstring.hh
new file mode 100644
index 0000000..3783cc1
--- /dev/null
+++ b/src/ceph/src/common/sstring.hh
@@ -0,0 +1,717 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright 2014 Cloudius Systems
+ */
+/*
+ * C++2014 dependencies removed.  Uses of std::string_view adapted to
+ * boost::string_ref.  Matt Benjamin <mbenjamin@redhat.com>
+ */
+
+#ifndef SSTRING_HH_
+#define SSTRING_HH_
+
+#include <type_traits>
+#include <boost/utility/string_view.hpp>
+
+#include "include/buffer.h"
+#include "include/denc.h"
+
+template <typename char_type, typename Size, Size max_size>
+class basic_sstring;
+
+using sstring = basic_sstring<char, uint32_t, 15>;
+
+template <typename string_type = sstring, typename T>
+inline string_type to_sstring(T value);
+
+template <typename char_type, typename Size, Size max_size>
+class basic_sstring {
+    static_assert(
+            (std::is_same<char_type, char>::value
+             || std::is_same<char_type, signed char>::value
+             || std::is_same<char_type, unsigned char>::value),
+            "basic_sstring only supports single byte char types");
+    union contents {
+        struct external_type {
+            char_type* str;
+            Size size;
+            int8_t pad;
+        } external;
+        struct internal_type {
+            char_type str[max_size];
+            int8_t size;
+        } internal;
+        static_assert(sizeof(external_type) <= sizeof(internal_type), "max_size too small");
+        static_assert(max_size <= 127, "max_size too large");
+    } u;
+    bool is_internal() const noexcept {
+        return u.internal.size >= 0;
+    }
+    bool is_external() const noexcept {
+        return !is_internal();
+    }
+    const char_type* str() const {
+        return is_internal() ? u.internal.str : u.external.str;
+    }
+    char_type* str() {
+        return is_internal() ? u.internal.str : u.external.str;
+    }
+
+    template <typename string_type, typename T>
+    static inline string_type to_sstring_sprintf(T value, const char* fmt) {
+        char tmp[sizeof(value) * 3 + 2];
+        auto len = std::sprintf(tmp, fmt, value);
+        using ch_type = typename string_type::value_type;
+        return string_type(reinterpret_cast<ch_type*>(tmp), len);
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(int value) {
+        return to_sstring_sprintf<string_type>(value, "%d");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(unsigned value) {
+        return to_sstring_sprintf<string_type>(value, "%u");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(long value) {
+        return to_sstring_sprintf<string_type>(value, "%ld");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(unsigned long value) {
+        return to_sstring_sprintf<string_type>(value, "%lu");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(long long value) {
+        return to_sstring_sprintf<string_type>(value, "%lld");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(unsigned long long value) {
+        return to_sstring_sprintf<string_type>(value, "%llu");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(float value) {
+        return to_sstring_sprintf<string_type>(value, "%g");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(double value) {
+        return to_sstring_sprintf<string_type>(value, "%g");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(long double value) {
+        return to_sstring_sprintf<string_type>(value, "%Lg");
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(const char* value) {
+        return string_type(value);
+    }
+
+    template <typename string_type>
+    static inline string_type to_sstring(sstring value) {
+        return value;
+    }
+
+public:
+    using value_type = char_type;
+    using traits_type = std::char_traits<char_type>;
+    using allocator_type = std::allocator<char_type>;
+    using reference = char_type&;
+    using const_reference = const char_type&;
+    using pointer = char_type*;
+    using const_pointer = const char_type*;
+    using iterator = char_type*;
+    using const_iterator = const char_type*;
+    // FIXME: add reverse_iterator and friend
+    using difference_type = ssize_t;  // std::make_signed_t<Size> can be too small
+    using size_type = Size;
+    static constexpr size_type  npos = static_cast<size_type>(-1);
+public:
+    struct initialized_later {};
+
+    basic_sstring() noexcept {
+        u.internal.size = 0;
+        u.internal.str[0] = '\0';
+    }
+    basic_sstring(const basic_sstring& x) {
+        if (x.is_internal()) {
+            u.internal = x.u.internal;
+        } else {
+            u.internal.size = -1;
+            u.external.str = reinterpret_cast<char_type*>(std::malloc(x.u.external.size + 1));
+            if (!u.external.str) {
+                throw std::bad_alloc();
+            }
+            std::copy(x.u.external.str, x.u.external.str + x.u.external.size + 1, u.external.str);
+            u.external.size = x.u.external.size;
+        }
+    }
+    basic_sstring(basic_sstring&& x) noexcept {
+        u = x.u;
+        x.u.internal.size = 0;
+        x.u.internal.str[0] = '\0';
+    }
+    basic_sstring(initialized_later, size_t size) {
+        if (size_type(size) != size) {
+            throw std::overflow_error("sstring overflow");
+        }
+        if (size + 1 <= sizeof(u.internal.str)) {
+            u.internal.str[size] = '\0';
+            u.internal.size = size;
+        } else {
+            u.internal.size = -1;
+            u.external.str = reinterpret_cast<char_type*>(std::malloc(size + 1));
+            if (!u.external.str) {
+                throw std::bad_alloc();
+            }
+            u.external.size = size;
+            u.external.str[size] = '\0';
+        }
+    }
+    basic_sstring(const char_type* x, size_t size) {
+        if (size_type(size) != size) {
+            throw std::overflow_error("sstring overflow");
+        }
+        if (size + 1 <= sizeof(u.internal.str)) {
+            std::copy(x, x + size, u.internal.str);
+            u.internal.str[size] = '\0';
+            u.internal.size = size;
+        } else {
+            u.internal.size = -1;
+            u.external.str = reinterpret_cast<char_type*>(std::malloc(size + 1));
+            if (!u.external.str) {
+                throw std::bad_alloc();
+            }
+            u.external.size = size;
+            std::copy(x, x + size, u.external.str);
+            u.external.str[size] = '\0';
+        }
+    }
+
+    basic_sstring(size_t size, char_type x) : basic_sstring(initialized_later(), size) {
+        memset(begin(), x, size);
+    }
+
+    basic_sstring(const char* x) : basic_sstring(reinterpret_cast<const char_type*>(x), std::strlen(x)) {}
+    basic_sstring(std::basic_string<char_type>& x) : basic_sstring(x.c_str(), x.size()) {}
+    basic_sstring(std::initializer_list<char_type> x) : basic_sstring(x.begin(), x.end() - x.begin()) {}
+    basic_sstring(const char_type* b, const char_type* e) : basic_sstring(b, e - b) {}
+    basic_sstring(const std::basic_string<char_type>& s)
+        : basic_sstring(s.data(), s.size()) {}
+    template <typename InputIterator>
+    basic_sstring(InputIterator first, InputIterator last)
+            : basic_sstring(initialized_later(), std::distance(first, last)) {
+        std::copy(first, last, begin());
+    }
+    ~basic_sstring() noexcept {
+        if (is_external()) {
+            std::free(u.external.str);
+        }
+    }
+    basic_sstring& operator=(const basic_sstring& x) {
+        basic_sstring tmp(x);
+        swap(tmp);
+        return *this;
+    }
+    basic_sstring& operator=(basic_sstring&& x) noexcept {
+        if (this != &x) {
+            swap(x);
+            x.reset();
+        }
+        return *this;
+    }
+    operator std::basic_string<char_type>() const {
+        return { str(), size() };
+    }
+    size_t size() const noexcept {
+        return is_internal() ? u.internal.size : u.external.size;
+    }
+
+    size_t length() const noexcept {
+        return size();
+    }
+
+    size_t find(char_type t, size_t pos = 0) const noexcept {
+        const char_type* it = str() + pos;
+        const char_type* end = str() + size();
+        while (it < end) {
+            if (*it == t) {
+                return it - str();
+            }
+            it++;
+        }
+        return npos;
+    }
+
+    size_t find(const basic_sstring& s, size_t pos = 0) const noexcept {
+        const char_type* it = str() + pos;
+        const char_type* end = str() + size();
+        const char_type* c_str = s.str();
+        const char_type* c_str_end = s.str() + s.size();
+
+        while (it < end) {
+            auto i = it;
+            auto j = c_str;
+            while ( i < end && j < c_str_end && *i == *j) {
+                i++;
+                j++;
+            }
+            if (j == c_str_end) {
+                return it - str();
+            }
+            it++;
+        }
+        return npos;
+    }
+
+    /**
+     * find_last_of find the last occurrence of c in the string.
+     * When pos is specified, the search only includes characters
+     * at or before position pos.
+     *
+     */
+    size_t find_last_of (char_type c, size_t pos = npos) const noexcept {
+        const char_type* str_start = str();
+        if (size()) {
+            if (pos >= size()) {
+                pos = size() - 1;
+            }
+            const char_type* p = str_start + pos + 1;
+            do {
+                p--;
+                if (*p == c) {
+                    return (p - str_start);
+                }
+            } while (p != str_start);
+        }
+        return npos;
+    }
+
+    /**
+     *  Append a C substring.
+     *  @param s  The C string to append.
+     *  @param n  The number of characters to append.
+     *  @return  Reference to this string.
+     */
+    basic_sstring& append (const char_type* s, size_t n) {
+        basic_sstring ret(initialized_later(), size() + n);
+        std::copy(begin(), end(), ret.begin());
+        std::copy(s, s + n, ret.begin() + size());
+        *this = std::move(ret);
+        return *this;
+    }
+
+    /**
+     *  Replace characters with a value of a C style substring.
+     *
+     */
+    basic_sstring& replace(size_type pos, size_type n1, const char_type* s,
+             size_type n2) {
+        if (pos > size()) {
+            throw std::out_of_range("sstring::replace out of range");
+        }
+
+        if (n1 > size() - pos) {
+            n1 = size() - pos;
+        }
+
+        if (n1 == n2) {
+            if (n2) {
+                std::copy(s, s + n2, begin() + pos);
+            }
+            return *this;
+        }
+        basic_sstring ret(initialized_later(), size() + n2 - n1);
+        char_type* p= ret.begin();
+        std::copy(begin(), begin() + pos, p);
+        p += pos;
+        if (n2) {
+            std::copy(s, s + n2, p);
+        }
+        p += n2;
+        std::copy(begin() + pos + n1, end(), p);
+        *this = std::move(ret);
+        return *this;
+    }
+
+    template <class InputIterator>
+    basic_sstring& replace (const_iterator i1, const_iterator i2,
+            InputIterator first, InputIterator last) {
+        if (i1 < begin() || i1 > end() || i2 < begin()) {
+            throw std::out_of_range("sstring::replace out of range");
+        }
+        if (i2 > end()) {
+            i2 = end();
+        }
+
+        if (i2 - i1 == last - first) {
+            //in place replacement
+            std::copy(first, last, const_cast<char_type*>(i1));
+            return *this;
+        }
+        basic_sstring ret(initialized_later(), size() + (last - first) - (i2 - i1));
+        char_type* p = ret.begin();
+        p = std::copy(cbegin(), i1, p);
+        p = std::copy(first, last, p);
+        std::copy(i2, cend(), p);
+        *this = std::move(ret);
+        return *this;
+    }
+
+    iterator erase(iterator first, iterator last) {
+        size_t pos = first - begin();
+        replace(pos, last - first, nullptr, 0);
+        return begin() + pos;
+    }
+
+    /**
+     * Inserts additional characters into the string right before
+     * the character indicated by p.
+     */
+    template <class InputIterator>
+    void insert(const_iterator p, InputIterator beg, InputIterator end) {
+        replace(p, p, beg, end);
+    }
+
+    /**
+     *  Returns a read/write reference to the data at the last
+     *  element of the string.
+     *  This function shall not be called on empty strings.
+     */
+    reference
+    back() noexcept {
+        return operator[](size() - 1);
+    }
+
+    /**
+     *  Returns a  read-only (constant) reference to the data at the last
+     *  element of the string.
+     *  This function shall not be called on empty strings.
+     */
+    const_reference
+    back() const noexcept {
+        return operator[](size() - 1);
+    }
+
+    basic_sstring substr(size_t from, size_t len = npos)  const {
+        if (from > size()) {
+            throw std::out_of_range("sstring::substr out of range");
+        }
+        if (len > size() - from) {
+            len = size() - from;
+        }
+        if (len == 0) {
+            return "";
+        }
+        return { str() + from , len };
+    }
+
+    const char_type& at(size_t pos) const {
+        if (pos >= size()) {
+            throw std::out_of_range("sstring::at out of range");
+        }
+        return *(str() + pos);
+    }
+
+    char_type& at(size_t pos) {
+        if (pos >= size()) {
+            throw std::out_of_range("sstring::at out of range");
+        }
+        return *(str() + pos);
+    }
+
+    bool empty() const noexcept {
+        return u.internal.size == 0;
+    }
+    void reset() noexcept {
+        if (is_external()) {
+            std::free(u.external.str);
+        }
+        u.internal.size = 0;
+        u.internal.str[0] = '\0';
+    }
+
+    int compare(const basic_sstring& x) const noexcept {
+        auto n = traits_type::compare(begin(), x.begin(), std::min(size(), x.size()));
+        if (n != 0) {
+            return n;
+        }
+        if (size() < x.size()) {
+            return -1;
+        } else if (size() > x.size()) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+
+    int compare(size_t pos, size_t sz, const basic_sstring& x) const {
+        if (pos > size()) {
+            throw std::out_of_range("pos larger than string size");
+        }
+
+        sz = std::min(size() - pos, sz);
+        auto n = traits_type::compare(begin() + pos, x.begin(), std::min(sz, x.size()));
+        if (n != 0) {
+            return n;
+        }
+        if (sz < x.size()) {
+            return -1;
+        } else if (sz > x.size()) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+
+    void swap(basic_sstring& x) noexcept {
+        contents tmp;
+        tmp = x.u;
+        x.u = u;
+        u = tmp;
+    }
+    const char_type* c_str() const {
+        return str();
+    }
+    const char_type* begin() const { return str(); }
+    const char_type* end() const { return str() + size(); }
+    const char_type* cbegin() const { return str(); }
+    const char_type* cend() const { return str() + size(); }
+    char_type* begin() { return str(); }
+    char_type* end() { return str() + size(); }
+    bool operator==(const basic_sstring& x) const {
+        return size() == x.size() && std::equal(begin(), end(), x.begin());
+    }
+    bool operator!=(const basic_sstring& x) const {
+        return !operator==(x);
+    }
+    bool operator<(const basic_sstring& x) const {
+        return compare(x) < 0;
+    }
+    basic_sstring operator+(const basic_sstring& x) const {
+        basic_sstring ret(initialized_later(), size() + x.size());
+        std::copy(begin(), end(), ret.begin());
+        std::copy(x.begin(), x.end(), ret.begin() + size());
+        return ret;
+    }
+    basic_sstring& operator+=(const basic_sstring& x) {
+        return *this = *this + x;
+    }
+    char_type& operator[](size_type pos) {
+        return str()[pos];
+    }
+    const char_type& operator[](size_type pos) const {
+        return str()[pos];
+    }
+    operator boost::basic_string_view<char_type, traits_type>() const {
+		return boost::basic_string_view<char_type, traits_type>(str(), size());
+    }
+    template <typename string_type, typename T>
+    friend inline string_type to_sstring(T value);
+};
+template <typename char_type, typename Size, Size max_size>
+constexpr Size basic_sstring<char_type, Size, max_size>::npos;
+
+template <typename char_type, typename size_type, size_type Max, size_type N>
+inline
+basic_sstring<char_type, size_type, Max>
+operator+(const char(&s)[N], const basic_sstring<char_type, size_type, Max>& t) {
+    using sstring = basic_sstring<char_type, size_type, Max>;
+    // don't copy the terminating NUL character
+    sstring ret(typename sstring::initialized_later(), N-1 + t.size());
+    auto p = std::copy(std::begin(s), std::end(s)-1, ret.begin());
+    std::copy(t.begin(), t.end(), p);
+    return ret;
+}
+
+template <size_t N>
+static inline
+size_t str_len(const char(&s)[N]) { return N - 1; }
+
+template <size_t N>
+static inline
+const char* str_begin(const char(&s)[N]) { return s; }
+
+template <size_t N>
+static inline
+const char* str_end(const char(&s)[N]) { return str_begin(s) + str_len(s); }
+
+template <typename char_type, typename size_type, size_type max_size>
+static inline
+const char_type* str_begin(const basic_sstring<char_type, size_type, max_size>& s) { return s.begin(); }
+
+template <typename char_type, typename size_type, size_type max_size>
+static inline
+const char_type* str_end(const basic_sstring<char_type, size_type, max_size>& s) { return s.end(); }
+
+template <typename char_type, typename size_type, size_type max_size>
+static inline
+size_type str_len(const basic_sstring<char_type, size_type, max_size>& s) { return s.size(); }
+
+template <typename First, typename Second, typename... Tail>
+static inline
+size_t str_len(const First& first, const Second& second, const Tail&... tail) {
+    return str_len(first) + str_len(second, tail...);
+}
+
+template <typename char_type, typename size_type, size_type max_size>
+inline
+void swap(basic_sstring<char_type, size_type, max_size>& x,
+          basic_sstring<char_type, size_type, max_size>& y) noexcept
+{
+    return x.swap(y);
+}
+
+template <typename char_type, typename size_type, size_type max_size, typename char_traits>
+inline
+std::basic_ostream<char_type, char_traits>&
+operator<<(std::basic_ostream<char_type, char_traits>& os,
+        const basic_sstring<char_type, size_type, max_size>& s) {
+    return os.write(s.begin(), s.size());
+}
+
+template <typename char_type, typename size_type, size_type max_size, typename char_traits>
+inline
+std::basic_istream<char_type, char_traits>&
+operator>>(std::basic_istream<char_type, char_traits>& is,
+        basic_sstring<char_type, size_type, max_size>& s) {
+    std::string tmp;
+    is >> tmp;
+    s = tmp;
+    return is;
+}
+
+namespace std {
+
+template <typename char_type, typename size_type, size_type max_size>
+struct hash<basic_sstring<char_type, size_type, max_size>> {
+    size_t operator()(const basic_sstring<char_type, size_type, max_size>& s) const {
+		using traits_type = std::char_traits<char_type>;
+		return std::hash<boost::basic_string_view<char_type,traits_type>>()(s);
+    }
+};
+
+}
+
+static inline
+char* copy_str_to(char* dst) {
+    return dst;
+}
+
+template <typename Head, typename... Tail>
+static inline
+char* copy_str_to(char* dst, const Head& head, const Tail&... tail) {
+    return copy_str_to(std::copy(str_begin(head), str_end(head), dst), tail...);
+}
+
+template <typename String = sstring, typename... Args>
+static String make_sstring(Args&&... args)
+{
+    String ret(sstring::initialized_later(), str_len(args...));
+    copy_str_to(ret.begin(), args...);
+    return ret;
+}
+
+template <typename string_type, typename T>
+inline string_type to_sstring(T value) {
+    return sstring::to_sstring<string_type>(value);
+}
+
+
+// encode/decode
+template <typename Char, typename Size, Size Max>
+struct denc_traits<basic_sstring<Char, Size, Max>> {
+private:
+  using value_type = basic_sstring<Char, Size, Max>;
+public:
+  static constexpr bool supported = true;
+  static constexpr bool featured = false;
+  static constexpr bool bounded = false;
+
+  static void bound_encode(const value_type& s, size_t& p, uint64_t f=0) {
+    p += sizeof(Size) + s.size();
+  }
+
+  static void encode_nohead(const value_type& s,
+                            buffer::list::contiguous_appender& p)
+  {
+    auto len = s.size();
+    if (len) {
+      p.append(reinterpret_cast<const char*>(s.c_str()), len);
+    }
+  }
+
+  static void decode_nohead(size_t len, value_type& s,
+                            buffer::ptr::iterator& p)
+  {
+    s.reset();
+    if (len) {
+      s.append(reinterpret_cast<const Char*>(p.get_pos_add(len)), len);
+    }
+  }
+
+  static void encode(const value_type& s,
+                     buffer::list::contiguous_appender& p,
+                     uint64_t f=0)
+  {
+    Size len = (Size)(s.size());
+    ::denc(len, p);
+    if (len) {
+      p.append(reinterpret_cast<const char*>(s.c_str()), len);
+    }
+  }
+
+  static void decode(value_type& s,
+                     buffer::ptr::iterator& p,
+                     uint64_t f=0)
+  {
+    Size len;
+    ::denc(len, p);
+    decode_nohead(len, s, p);
+  }
+};
+
+#if 0 /* XXX conflicts w/Ceph types.h */
+template <typename T>
+inline
+std::ostream& operator<<(std::ostream& os, const std::vector<T>& v) {
+    bool first = true;
+    os << "{";
+    for (auto&& elem : v) {
+        if (!first) {
+            os << ", ";
+        } else {
+            first = false;
+        }
+        os << elem;
+    }
+    os << "}";
+    return os;
+}
+#endif
+
+#endif /* SSTRING_HH_ */