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(svn r14514) -Codechange: use 'size' instead of 'length' for querystring and textbuf, explicitly say it includes the terminating zero 

-Fix: one couldn't rename things with too long default/automatic name
-Fix: buffer overflow in console when too long (1024 bytes) command was entered
This commit is contained in:
smatz 2008-10-22 19:12:10 +00:00
parent 6bc0f0ef92
commit c10f7db576
7 changed files with 52 additions and 46 deletions
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6
src/console_gui.cpp
View File

@ -133,7 +133,7 @@ IConsoleModes _iconsole_mode;
static void IConsoleClearCommand()
{
memset(_iconsole_cmdline.buf, 0, ICON_CMDLN_SIZE);
_iconsole_cmdline.length = 0;
_iconsole_cmdline.size = 1; // only terminating zero
_iconsole_cmdline.width = 0;
_iconsole_cmdline.caretpos = 0;
_iconsole_cmdline.caretxoffs = 0;
@ -336,7 +336,7 @@ void IConsoleGUIInit()
memset(_iconsole_history, 0, sizeof(_iconsole_history));
_iconsole_cmdline.buf = CallocT<char>(ICON_CMDLN_SIZE); // create buffer and zero it
_iconsole_cmdline.maxlength = ICON_CMDLN_SIZE;
_iconsole_cmdline.maxsize = ICON_CMDLN_SIZE;
IConsolePrintF(CC_WARNING, "OpenTTD Game Console Revision 7 - %s", _openttd_revision);
IConsolePrint(CC_WHITE, "------------------------------------");
@ -430,7 +430,7 @@ static void IConsoleHistoryNavigate(int direction)
IConsoleClearCommand();
/* copy history to 'command prompt / bash' */
assert(_iconsole_history[i] != NULL && IsInsideMM(i, 0, ICON_HISTORY_SIZE));
ttd_strlcpy(_iconsole_cmdline.buf, _iconsole_history[i], _iconsole_cmdline.maxlength);
ttd_strlcpy(_iconsole_cmdline.buf, _iconsole_history[i], _iconsole_cmdline.maxsize);
UpdateTextBufferSize(&_iconsole_cmdline);
}

1
src/genworld_gui.cpp
View File

@ -255,6 +255,7 @@ struct GenerateLandscapeWindow : public QueryStringBaseWindow {
{
this->LowerWidget(_settings_newgame.game_creation.landscape + GLAND_TEMPERATE);
/* snprintf() always outputs trailing '\0', so whole buffer can be used */
snprintf(this->edit_str_buf, this->edit_str_size, "%u", _settings_newgame.game_creation.generation_seed);
InitializeTextBuffer(&this->text, this->edit_str_buf, this->edit_str_size, 120);
this->caption = STR_NULL;

68
src/misc_gui.cpp
View File

@ -793,8 +793,8 @@ static void DelChar(Textbuf *tb, bool backspace)
}
/* Move the remaining characters over the marker */
memmove(s, s + len, tb->length - (s - tb->buf) - len + 1);
tb->length -= len;
memmove(s, s + len, tb->size - (s - tb->buf) - len);
tb->size -= len;
}
/**
@ -809,7 +809,7 @@ bool DeleteTextBufferChar(Textbuf *tb, int delmode)
if (delmode == WKC_BACKSPACE && tb->caretpos != 0) {
DelChar(tb, true);
return true;
} else if (delmode == WKC_DELETE && tb->caretpos < tb->length) {
} else if (delmode == WKC_DELETE && tb->caretpos < tb->size - 1) {
DelChar(tb, false);
return true;
}
@ -823,9 +823,9 @@ bool DeleteTextBufferChar(Textbuf *tb, int delmode)
*/
void DeleteTextBufferAll(Textbuf *tb)
{
memset(tb->buf, 0, tb->maxlength);
tb->length = tb->width = 0;
tb->caretpos = tb->caretxoffs = 0;
memset(tb->buf, 0, tb->maxsize);
tb->size = 1;
tb->width = tb->caretpos = tb->caretxoffs = 0;
}
/**
@ -840,11 +840,11 @@ bool InsertTextBufferChar(Textbuf *tb, WChar key)
{
const byte charwidth = GetCharacterWidth(FS_NORMAL, key);
uint16 len = (uint16)Utf8CharLen(key);
if (tb->length < (tb->maxlength - len) && (tb->maxwidth == 0 || tb->width + charwidth <= tb->maxwidth)) {
memmove(tb->buf + tb->caretpos + len, tb->buf + tb->caretpos, tb->length - tb->caretpos + 1);
if (tb->size + len <= tb->maxsize && (tb->maxwidth == 0 || tb->width + charwidth <= tb->maxwidth)) {
memmove(tb->buf + tb->caretpos + len, tb->buf + tb->caretpos, tb->size - tb->caretpos);
Utf8Encode(tb->buf + tb->caretpos, key);
tb->length += len;
tb->width += charwidth;
tb->size += len;
tb->width += charwidth;
tb->caretpos += len;
tb->caretxoffs += charwidth;
@ -876,7 +876,7 @@ bool MoveTextBufferPos(Textbuf *tb, int navmode)
break;
case WKC_RIGHT:
if (tb->caretpos < tb->length) {
if (tb->caretpos < tb->size - 1) {
WChar c;
tb->caretpos += (uint16)Utf8Decode(&c, tb->buf + tb->caretpos);
@ -892,7 +892,7 @@ bool MoveTextBufferPos(Textbuf *tb, int navmode)
return true;
case WKC_END:
tb->caretpos = tb->length;
tb->caretpos = tb->size - 1;
tb->caretxoffs = tb->width;
return true;
@ -908,16 +908,18 @@ bool MoveTextBufferPos(Textbuf *tb, int navmode)
* and the maximum length of this buffer
* @param tb Textbuf type which is getting initialized
* @param buf the buffer that will be holding the data for input
* @param maxlength maximum length in characters of this buffer
* @param maxsize maximum size in bytes, including terminating '\0'
* @param maxwidth maximum length in pixels of this buffer. If reached, buffer
* cannot grow, even if maxlength would allow because there is space. A length
* of zero '0' means the buffer is only restricted by maxlength */
void InitializeTextBuffer(Textbuf *tb, const char *buf, uint16 maxlength, uint16 maxwidth)
* cannot grow, even if maxsize would allow because there is space. Width
* of zero '0' means the buffer is only restricted by maxsize */
void InitializeTextBuffer(Textbuf *tb, char *buf, uint16 maxsize, uint16 maxwidth)
{
tb->buf = (char*)buf;
tb->maxlength = maxlength;
tb->maxwidth = maxwidth;
tb->caret = true;
assert(maxsize != 0);
tb->buf = buf;
tb->maxsize = maxsize;
tb->maxwidth = maxwidth;
tb->caret = true;
UpdateTextBufferSize(tb);
}
@ -930,17 +932,19 @@ void InitializeTextBuffer(Textbuf *tb, const char *buf, uint16 maxlength, uint16
void UpdateTextBufferSize(Textbuf *tb)
{
const char *buf = tb->buf;
WChar c = Utf8Consume(&buf);
tb->width = 0;
tb->length = 0;
tb->size = 1; // terminating zero
for (; c != '\0' && tb->length < (tb->maxlength - 1); c = Utf8Consume(&buf)) {
WChar c;
while ((c = Utf8Consume(&buf)) != '\0') {
tb->width += GetCharacterWidth(FS_NORMAL, c);
tb->length += Utf8CharLen(c);
tb->size += Utf8CharLen(c);
}
tb->caretpos = tb->length;
assert(tb->size <= tb->maxsize);
tb->caretpos = tb->size - 1;
tb->caretxoffs = tb->width;
}
@ -1163,22 +1167,22 @@ static const WindowDesc _query_string_desc = {
/** Show a query popup window with a textbox in it.
* @param str StringID for the text shown in the textbox
* @param caption StringID of text shown in caption of querywindow
* @param maxlen maximum length in characters allowed
* @param maxsize maximum size in bytes (including terminating '\0')
* @param maxwidth maximum width in pixels allowed
* @param parent pointer to a Window that will handle the events (ok/cancel) of this
* window. If NULL, results are handled by global function HandleOnEditText
* @param afilter filters out unwanted character input
* @param flags various flags, @see QueryStringFlags
*/
void ShowQueryString(StringID str, StringID caption, uint maxlen, uint maxwidth, Window *parent, CharSetFilter afilter, QueryStringFlags flags)
void ShowQueryString(StringID str, StringID caption, uint maxsize, uint maxwidth, Window *parent, CharSetFilter afilter, QueryStringFlags flags)
{
DeleteWindowById(WC_QUERY_STRING, 0);
DeleteWindowById(WC_SAVELOAD, 0);
QueryStringWindow *w = new QueryStringWindow(maxlen + 1, &_query_string_desc, parent);
QueryStringWindow *w = new QueryStringWindow(maxsize, &_query_string_desc, parent);
GetString(w->edit_str_buf, str, &w->edit_str_buf[maxlen]);
w->edit_str_buf[maxlen] = '\0';
GetString(w->edit_str_buf, str, &w->edit_str_buf[maxsize - 1]);
w->edit_str_buf[maxsize - 1] = '\0';
if ((flags & QSF_ACCEPT_UNCHANGED) == 0) w->orig = strdup(w->edit_str_buf);
@ -1194,7 +1198,7 @@ void ShowQueryString(StringID str, StringID caption, uint maxlen, uint maxwidth,
w->LowerWidget(QUERY_STR_WIDGET_TEXT);
w->caption = caption;
w->afilter = afilter;
InitializeTextBuffer(&w->text, w->edit_str_buf, maxlen, maxwidth);
InitializeTextBuffer(&w->text, w->edit_str_buf, maxsize, maxwidth);
}
@ -1583,7 +1587,7 @@ struct SaveLoadWindow : public QueryStringBaseWindow {
ShowHeightmapLoad();
} else {
/* SLD_SAVE_GAME, SLD_SAVE_SCENARIO copy clicked name to editbox */
ttd_strlcpy(this->text.buf, file->title, this->text.maxlength);
ttd_strlcpy(this->text.buf, file->title, this->text.maxsize);
UpdateTextBufferSize(&this->text);
this->InvalidateWidget(10);
}

4
src/network/network_chat_gui.cpp
View File

@ -374,11 +374,11 @@ struct NetworkChatWindow : public QueryStringBaseWindow {
/* If we are completing at the begin of the line, skip the ': ' we added */
if (tb_buf == pre_buf) {
offset = 0;
length = tb->length - 2;
length = (tb->size - 1) - 2;
} else {
/* Else, find the place we are completing at */
offset = strlen(pre_buf) + 1;
length = tb->length - offset;
length = (tb->size - 1) - offset;
}
/* Compare if we have a match */

3
src/querystring_gui.h
View File

@ -41,10 +41,11 @@ struct QueryString {
struct QueryStringBaseWindow : public Window, public QueryString {
char *edit_str_buf;
char *orig_str_buf;
const uint16 edit_str_size;
const uint16 edit_str_size; ///< maximum length of string (in bytes), including terminating '\0'
QueryStringBaseWindow(uint16 size, const WindowDesc *desc, WindowNumber window_number = 0) : Window(desc, window_number), edit_str_size(size)
{
assert(size != 0);
this->edit_str_buf = CallocT<char>(size);
}

2
src/signs_gui.cpp
View File

@ -215,7 +215,7 @@ struct SignWindow : QueryStringBaseWindow, SignList {
void UpdateSignEditWindow(const Sign *si)
{
char *last_of = &this->edit_str_buf[this->edit_str_size - 1];
char *last_of = &this->edit_str_buf[this->edit_str_size - 1]; // points to terminating '\0'
/* Display an empty string when the sign hasnt been edited yet */
if (si->name != NULL) {

14
src/textbuf_gui.h
View File

@ -11,12 +11,12 @@
#include "core/enum_type.hpp"
struct Textbuf {
char *buf; ///< buffer in which text is saved
uint16 maxlength, maxwidth; ///< the maximum size of the buffer. Maxwidth specifies screensize in pixels, maxlength is in bytes
uint16 length, width; ///< the current size of the string. Width specifies screensize in pixels, length is in bytes
bool caret; ///< is the caret ("_") visible or not
uint16 caretpos; ///< the current position of the caret in the buffer, in bytes
uint16 caretxoffs; ///< the current position of the caret in pixels
char *buf; ///< buffer in which text is saved
uint16 maxsize, maxwidth; ///< the maximum size of the buffer. Maxwidth specifies screensize in pixels, maxsize is in bytes (including terminating '\0')
uint16 size, width; ///< the current size of the string. Width specifies screensize in pixels, size is in bytes
bool caret; ///< is the caret ("_") visible or not
uint16 caretpos; ///< the current position of the caret in the buffer, in bytes
uint16 caretxoffs; ///< the current position of the caret in pixels
};
bool HandleCaret(Textbuf *tb);
@ -26,7 +26,7 @@ bool DeleteTextBufferChar(Textbuf *tb, int delmode);
bool InsertTextBufferChar(Textbuf *tb, uint32 key);
bool InsertTextBufferClipboard(Textbuf *tb);
bool MoveTextBufferPos(Textbuf *tb, int navmode);
void InitializeTextBuffer(Textbuf *tb, const char *buf, uint16 maxlength, uint16 maxwidth);
void InitializeTextBuffer(Textbuf *tb, char *buf, uint16 maxsize, uint16 maxwidth);
void UpdateTextBufferSize(Textbuf *tb);
/** Flags used in ShowQueryString() call */