AK: Remove unnecessary casts to size_t, after Vector changes

Now that Vector uses size_t, we can remove a whole bunch of redundant
casts to size_t.

15 files changed, 60 insertions, 57 deletions

diff --git a/AK/JsonParser.cpp b/AK/JsonParser.cpp
index 2f21e3b04b..b99bb91bd5 100644
--- a/AK/JsonParser.cpp
+++ b/AK/JsonParser.cpp
@@ -130,7 +130,7 @@ String JsonParser::consume_quoted_string()
         return String::empty();
 
     auto& last_string_starting_with_character = m_last_string_starting_with_character[(u8)buffer.first()];
-    if (last_string_starting_with_character.length() == (size_t)buffer.size()) {
+    if (last_string_starting_with_character.length() == buffer.size()) {
         if (!memcmp(last_string_starting_with_character.characters(), buffer.data(), buffer.size()))
             return last_string_starting_with_character;
     }
diff --git a/AK/String.cpp b/AK/String.cpp
index 980b346867..131ba9e70f 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -143,7 +143,7 @@ Vector<String> String::split_limit(char separator, size_t limit, bool keep_empty
 
     Vector<String> v;
     size_t substart = 0;
-    for (size_t i = 0; i < length() && ((size_t)v.size() + 1) != limit; ++i) {
+    for (size_t i = 0; i < length() && (v.size() + 1) != limit; ++i) {
         char ch = characters()[i];
         if (ch == separator) {
             size_t sublen = i - substart;
diff --git a/AK/StringBuilder.cpp b/AK/StringBuilder.cpp
index da97a970c8..28f89098f5 100644
--- a/AK/StringBuilder.cpp
+++ b/AK/StringBuilder.cpp
@@ -33,8 +33,8 @@ namespace AK {
 
 inline void StringBuilder::will_append(size_t size)
 {
-    if ((m_length + size) > (size_t)m_buffer.size())
-        m_buffer.grow(max((size_t)16, (size_t)m_buffer.size() * 2 + size));
+    if ((m_length + size) > m_buffer.size())
+        m_buffer.grow(max(static_cast<size_t>(16), m_buffer.size() * 2 + size));
 }
 
 StringBuilder::StringBuilder(size_t initial_capacity)
diff --git a/AK/StringView.cpp b/AK/StringView.cpp
index 6f8af57d10..0dcd8e5b54 100644
--- a/AK/StringView.cpp
+++ b/AK/StringView.cpp
@@ -40,7 +40,7 @@ StringView::StringView(const String& string)
 
 StringView::StringView(const ByteBuffer& buffer)
     : m_characters((const char*)buffer.data())
-    , m_length((size_t)buffer.size())
+    , m_length(buffer.size())
 {
 }
 
diff --git a/Applications/Help/main.cpp b/Applications/Help/main.cpp
index 2af401b9c9..010a87f0e5 100644
--- a/Applications/Help/main.cpp
+++ b/Applications/Help/main.cpp
@@ -122,7 +122,7 @@ int main(int argc, char* argv[])
             return;
         }
         auto buffer = file->read_all();
-        StringView source { (const char*)buffer.data(), (size_t)buffer.size() };
+        StringView source { (const char*)buffer.data(), buffer.size() };
 
         MDDocument md_document;
         bool success = md_document.parse(source);
diff --git a/Kernel/Scheduler.cpp b/Kernel/Scheduler.cpp
index b9c2540202..a5aa46f089 100644
--- a/Kernel/Scheduler.cpp
+++ b/Kernel/Scheduler.cpp
@@ -599,7 +599,7 @@ void Scheduler::timer_tick(RegisterState& regs)
         sample.pid = Process::current->pid();
         sample.tid = Thread::current->tid();
         sample.timestamp = g_uptime;
-        for (size_t i = 0; i < min((size_t)backtrace.size(), Profiling::max_stack_frame_count); ++i) {
+        for (size_t i = 0; i < min(backtrace.size(), Profiling::max_stack_frame_count); ++i) {
             sample.frames[i] = backtrace[i];
         }
     }
diff --git a/Libraries/LibCore/ProcessStatisticsReader.cpp b/Libraries/LibCore/ProcessStatisticsReader.cpp
index ed7616a9d0..cd87e00e31 100644
--- a/Libraries/LibCore/ProcessStatisticsReader.cpp
+++ b/Libraries/LibCore/ProcessStatisticsReader.cpp
@@ -47,7 +47,7 @@ HashMap<pid_t, Core::ProcessStatistics> ProcessStatisticsReader::get_all()
     HashMap<pid_t, Core::ProcessStatistics> map;
 
     auto file_contents = file->read_all();
-    auto json = JsonValue::from_string({ file_contents.data(), (size_t)file_contents.size() });
+    auto json = JsonValue::from_string(file_contents);
     json.as_array().for_each([&](auto& value) {
         const JsonObject& process_object = value.as_object();
         Core::ProcessStatistics process;
diff --git a/Libraries/LibGUI/TextDocument.cpp b/Libraries/LibGUI/TextDocument.cpp
index 51d7323cd8..a303824a63 100644
--- a/Libraries/LibGUI/TextDocument.cpp
+++ b/Libraries/LibGUI/TextDocument.cpp
@@ -86,7 +86,7 @@ void TextDocument::set_text(const StringView& text)
 size_t TextDocumentLine::first_non_whitespace_column() const
 {
     for (size_t i = 0; i < length(); ++i) {
-        if (!isspace(m_text[(int)i]))
+        if (!isspace(m_text[i]))
             return i;
     }
     return length();
diff --git a/Libraries/LibGUI/TextDocument.h b/Libraries/LibGUI/TextDocument.h
index 51234450b7..76ce03d23a 100644
--- a/Libraries/LibGUI/TextDocument.h
+++ b/Libraries/LibGUI/TextDocument.h
@@ -75,9 +75,9 @@ public:
     static NonnullRefPtr<TextDocument> create(Client* client = nullptr);
     ~TextDocument();
 
-    size_t line_count() const { return (size_t)m_lines.size(); }
-    const TextDocumentLine& line(size_t line_index) const { return m_lines[(int)line_index]; }
-    TextDocumentLine& line(size_t line_index) { return m_lines[(int)line_index]; }
+    size_t line_count() const { return m_lines.size(); }
+    const TextDocumentLine& line(size_t line_index) const { return m_lines[line_index]; }
+    TextDocumentLine& line(size_t line_index) { return m_lines[line_index]; }
 
     void set_spans(const Vector<TextDocumentSpan>& spans) { m_spans = spans; }
 
@@ -88,7 +88,7 @@ public:
 
     bool has_spans() const { return !m_spans.is_empty(); }
     const Vector<TextDocumentSpan>& spans() const { return m_spans; }
-    void set_span_at_index(size_t index, TextDocumentSpan span) { m_spans[(int)index] = move(span); }
+    void set_span_at_index(size_t index, TextDocumentSpan span) { m_spans[index] = move(span); }
 
     void append_line(NonnullOwnPtr<TextDocumentLine>);
     void remove_line(size_t line_index);
@@ -156,7 +156,7 @@ public:
 
     StringView view() const { return { characters(), (size_t)length() }; }
     const char* characters() const { return m_text.data(); }
-    size_t length() const { return (size_t)m_text.size() - 1; }
+    size_t length() const { return m_text.size() - 1; }
     void set_text(TextDocument&, const StringView&);
     void append(TextDocument&, char);
     void prepend(TextDocument&, char);
diff --git a/Libraries/LibGUI/TextEditor.cpp b/Libraries/LibGUI/TextEditor.cpp
index fa501d3f95..6ee66b43f5 100644
--- a/Libraries/LibGUI/TextEditor.cpp
+++ b/Libraries/LibGUI/TextEditor.cpp
@@ -559,7 +559,8 @@ void TextEditor::move_selected_lines_down()
     get_selection_line_boundaries(first_line, last_line);
 
     auto& lines = document().lines();
-    if (last_line >= (size_t)(lines.size() - 1))
+    ASSERT(lines.size() != 0);
+    if (last_line >= lines.size() - 1)
         return;
 
     lines.insert((int)first_line, lines.take((int)last_line + 1));
diff --git a/Libraries/LibIPC/ClientConnection.h b/Libraries/LibIPC/ClientConnection.h
index 12207e4a2b..d1a7803425 100644
--- a/Libraries/LibIPC/ClientConnection.h
+++ b/Libraries/LibIPC/ClientConnection.h
@@ -108,7 +108,7 @@ public:
 
         auto buffer = message.encode();
 
-        int nwritten = write(m_socket->fd(), buffer.data(), (size_t)buffer.size());
+        int nwritten = write(m_socket->fd(), buffer.data(), buffer.size());
         if (nwritten < 0) {
             switch (errno) {
             case EPIPE:
@@ -149,7 +149,7 @@ public:
         }
 
         size_t decoded_bytes = 0;
-        for (size_t index = 0; index < (size_t)bytes.size(); index += decoded_bytes) {
+        for (size_t index = 0; index < bytes.size(); index += decoded_bytes) {
             auto remaining_bytes = ByteBuffer::wrap(bytes.data() + index, bytes.size() - index);
             auto message = Endpoint::decode_message(remaining_bytes, decoded_bytes);
             if (!message) {
diff --git a/Libraries/LibIPC/ServerConnection.h b/Libraries/LibIPC/ServerConnection.h
index db3bb53aff..bd8dfad71b 100644
--- a/Libraries/LibIPC/ServerConnection.h
+++ b/Libraries/LibIPC/ServerConnection.h
@@ -121,7 +121,7 @@ public:
     bool post_message(const Message& message)
     {
         auto buffer = message.encode();
-        int nwritten = write(m_connection->fd(), buffer.data(), (size_t)buffer.size());
+        int nwritten = write(m_connection->fd(), buffer.data(), buffer.size());
         if (nwritten < 0) {
             perror("write");
             ASSERT_NOT_REACHED();
@@ -165,7 +165,7 @@ private:
         }
 
         size_t decoded_bytes = 0;
-        for (size_t index = 0; index < (size_t)bytes.size(); index += decoded_bytes) {
+        for (size_t index = 0; index < bytes.size(); index += decoded_bytes) {
             auto remaining_bytes = ByteBuffer::wrap(bytes.data() + index, bytes.size() - index);
             if (auto message = LocalEndpoint::decode_message(remaining_bytes, decoded_bytes)) {
                 m_unprocessed_messages.append(move(message));
diff --git a/Shell/LineEditor.cpp b/Shell/LineEditor.cpp
index 27336bb954..84b97384be 100644
--- a/Shell/LineEditor.cpp
+++ b/Shell/LineEditor.cpp
@@ -66,21 +66,21 @@ void LineEditor::insert(const String& string)
     fputs(string.characters(), stdout);
     fflush(stdout);
 
-    if (m_cursor == (size_t)m_buffer.size()) {
-        m_buffer.append(string.characters(), (int)string.length());
-        m_cursor = (size_t)m_buffer.size();
+    if (m_cursor == m_buffer.size()) {
+        m_buffer.append(string.characters(), string.length());
+        m_cursor = m_buffer.size();
         return;
     }
 
     vt_save_cursor();
     vt_clear_to_end_of_line();
-    for (size_t i = m_cursor; i < (size_t)m_buffer.size(); ++i)
-        fputc(m_buffer[(int)i], stdout);
+    for (size_t i = m_cursor; i < m_buffer.size(); ++i)
+        fputc(m_buffer[i], stdout);
     vt_restore_cursor();
 
-    m_buffer.ensure_capacity(m_buffer.size() + (int)string.length());
+    m_buffer.ensure_capacity(m_buffer.size() + string.length());
     for (size_t i = 0; i < string.length(); ++i)
-        m_buffer.insert((int)m_cursor + (int)i, string[i]);
+        m_buffer.insert(m_cursor + i, string[i]);
     m_cursor += string.length();
 }
 
@@ -89,19 +89,19 @@ void LineEditor::insert(const char ch)
     putchar(ch);
     fflush(stdout);
 
-    if (m_cursor == (size_t)m_buffer.size()) {
+    if (m_cursor == m_buffer.size()) {
         m_buffer.append(ch);
-        m_cursor = (size_t)m_buffer.size();
+        m_cursor = m_buffer.size();
         return;
     }
 
     vt_save_cursor();
     vt_clear_to_end_of_line();
-    for (size_t i = m_cursor; i < (size_t)m_buffer.size(); ++i)
-        fputc(m_buffer[(int)i], stdout);
+    for (size_t i = m_cursor; i < m_buffer.size(); ++i)
+        fputc(m_buffer[i], stdout);
     vt_restore_cursor();
 
-    m_buffer.insert((int)m_cursor, ch);
+    m_buffer.insert(m_cursor, ch);
     ++m_cursor;
 }
 
@@ -173,7 +173,7 @@ Vector<String> LineEditor::tab_complete_first_token(const String& token)
     if (completion.length() > token.length())
         insert(completion.substring(token.length(), completion.length() - token.length()));
     // If we have a single match, we add a space, unless we already have one.
-    if (!seen_others && (m_cursor == (size_t)m_buffer.size() || m_buffer[(int)m_cursor] != ' '))
+    if (!seen_others && (m_cursor == m_buffer.size() || m_buffer[m_cursor] != ' '))
         insert(' ');
 
     return suggestions;
@@ -184,18 +184,20 @@ Vector<String> LineEditor::tab_complete_other_token(String& token)
     String path;
     Vector<String> suggestions;
 
-    int last_slash = (int)token.length() - 1;
+    ASSERT(token.length() != 0);
+
+    ssize_t last_slash = token.length() - 1;
     while (last_slash >= 0 && token[last_slash] != '/')
         --last_slash;
 
     if (last_slash >= 0) {
         // Split on the last slash. We'll use the first part as the directory
         // to search and the second part as the token to complete.
-        path = token.substring(0, (size_t)last_slash + 1);
+        path = token.substring(0, last_slash + 1);
         if (path[0] != '/')
             path = String::format("%s/%s", g.cwd.characters(), path.characters());
         path = canonicalized_path(path);
-        token = token.substring((size_t)last_slash + 1, token.length() - (size_t)last_slash - 1);
+        token = token.substring(last_slash + 1, token.length() - last_slash - 1);
     } else {
         // We have no slashes, so the directory to search is the current
         // directory and the token to complete is just the original token.
@@ -247,7 +249,7 @@ Vector<String> LineEditor::tab_complete_other_token(String& token)
         if (!stat_error) {
             if (S_ISDIR(program_status.st_mode))
                 insert('/');
-            else if (m_cursor == (size_t)m_buffer.size() || m_buffer[(int)m_cursor] != ' ')
+            else if (m_cursor == m_buffer.size() || m_buffer[m_cursor] != ' ')
                 insert(' ');
         }
     }
@@ -297,17 +299,17 @@ String LineEditor::get_line(const String& prompt)
         }
 
         auto do_delete = [&] {
-            if (m_cursor == (size_t)m_buffer.size()) {
+            if (m_cursor == m_buffer.size()) {
                 fputc('\a', stdout);
                 fflush(stdout);
                 return;
             }
-            m_buffer.remove((int)m_cursor - 1);
+            m_buffer.remove(m_cursor - 1);
             fputs("\033[3~", stdout);
             fflush(stdout);
             vt_save_cursor();
             vt_clear_to_end_of_line();
-            for (size_t i = m_cursor; i < (size_t)m_buffer.size(); ++i)
+            for (size_t i = m_cursor; i < m_buffer.size(); ++i)
                 fputc(m_buffer[i], stdout);
             vt_restore_cursor();
         };
@@ -353,7 +355,7 @@ String LineEditor::get_line(const String& prompt)
                     m_state = InputState::Free;
                     continue;
                 case 'C': // right
-                    if (m_cursor < (size_t)m_buffer.size()) {
+                    if (m_cursor < m_buffer.size()) {
                         ++m_cursor;
                         fputs("\033[C", stdout);
                         fflush(stdout);
@@ -369,10 +371,10 @@ String LineEditor::get_line(const String& prompt)
                     m_state = InputState::Free;
                     continue;
                 case 'F':
-                    if (m_cursor < (size_t)m_buffer.size()) {
-                        fprintf(stdout, "\033[%zuC", (size_t)m_buffer.size() - m_cursor);
+                    if (m_cursor < m_buffer.size()) {
+                        fprintf(stdout, "\033[%zuC", m_buffer.size() - m_cursor);
                         fflush(stdout);
-                        m_cursor = (size_t)m_buffer.size();
+                        m_cursor = m_buffer.size();
                     }
                     m_state = InputState::Free;
                     continue;
@@ -398,10 +400,10 @@ String LineEditor::get_line(const String& prompt)
             }
 
             if (ch == '\t') {
-                bool is_empty_token = m_cursor == 0 || m_buffer[(int)m_cursor - 1] == ' ';
+                bool is_empty_token = m_cursor == 0 || m_buffer[m_cursor - 1] == ' ';
                 m_times_tab_pressed++;
 
-                int token_start = (int)m_cursor - 1;
+                int token_start = m_cursor - 1;
                 if (!is_empty_token) {
                     while (token_start >= 0 && m_buffer[token_start] != ' ')
                         --token_start;
@@ -416,7 +418,7 @@ String LineEditor::get_line(const String& prompt)
                     }
                 }
 
-                String token = is_empty_token ? String() : String(&m_buffer[token_start], m_cursor - (size_t)token_start);
+                String token = is_empty_token ? String() : String(&m_buffer[token_start], m_cursor - token_start);
                 Vector<String> suggestions;
 
                 if (is_first_token)
@@ -463,13 +465,13 @@ String LineEditor::get_line(const String& prompt)
                     fflush(stdout);
                     return;
                 }
-                m_buffer.remove((int)m_cursor - 1);
+                m_buffer.remove(m_cursor - 1);
                 --m_cursor;
                 putchar(8);
                 vt_save_cursor();
                 vt_clear_to_end_of_line();
-                for (size_t i = m_cursor; i < (size_t)m_buffer.size(); ++i)
-                    fputc(m_buffer[(int)i], stdout);
+                for (size_t i = m_cursor; i < m_buffer.size(); ++i)
+                    fputc(m_buffer[i], stdout);
                 vt_restore_cursor();
             };
 
@@ -480,7 +482,7 @@ String LineEditor::get_line(const String& prompt)
             if (ch == g.termios.c_cc[VWERASE]) {
                 bool has_seen_nonspace = false;
                 while (m_cursor > 0) {
-                    if (isspace(m_buffer[(int)m_cursor - 1])) {
+                    if (isspace(m_buffer[m_cursor - 1])) {
                         if (has_seen_nonspace)
                             break;
                     } else {
@@ -500,8 +502,8 @@ String LineEditor::get_line(const String& prompt)
                 fputs(prompt.characters(), stdout);
                 for (size_t i = 0; i < m_buffer.size(); ++i)
                     fputc(m_buffer[i], stdout);
-                if (m_cursor < (size_t)m_buffer.size())
-                    printf("\033[%zuD", (size_t)m_buffer.size() - m_cursor); // Move cursor N steps left.
+                if (m_cursor < m_buffer.size())
+                    printf("\033[%zuD", m_buffer.size() - m_cursor); // Move cursor N steps left.
                 fflush(stdout);
                 continue;
             }
@@ -521,10 +523,10 @@ String LineEditor::get_line(const String& prompt)
                 continue;
             }
             if (ch == 0x05) { // ^E
-                if (m_cursor < (size_t)m_buffer.size()) {
-                    printf("\033[%zuC", (size_t)m_buffer.size() - m_cursor);
+                if (m_cursor < m_buffer.size()) {
+                    printf("\033[%zuC", m_buffer.size() - m_cursor);
                     fflush(stdout);
-                    m_cursor = (size_t)m_buffer.size();
+                    m_cursor = m_buffer.size();
                 }
                 continue;
             }
diff --git a/Userland/man.cpp b/Userland/man.cpp
index 055961bd2e..47c3d7d9d9 100644
--- a/Userland/man.cpp
+++ b/Userland/man.cpp
@@ -97,7 +97,7 @@ int main(int argc, char* argv[])
 
     dbg() << "Loading man page from " << file->filename();
     auto buffer = file->read_all();
-    String source { (const char*)buffer.data(), (size_t)buffer.size() };
+    auto source = String::copy(buffer);
 
     printf("%s(%s)\t\tSerenityOS manual\n", name, section);
 
diff --git a/Userland/md.cpp b/Userland/md.cpp
index 50297ba47a..f0f5ee576e 100644
--- a/Userland/md.cpp
+++ b/Userland/md.cpp
@@ -68,7 +68,7 @@ int main(int argc, char* argv[])
     auto buffer = file->read_all();
     dbg() << "Read size " << buffer.size();
 
-    String input { (const char*)buffer.data(), (size_t)buffer.size() };
+    auto input = String::copy(buffer);
     MDDocument document;
     success = document.parse(input);