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* Make the WPS parser close open conditionals on new sublines and comments as well as new lines.

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* Make the displaying code check for invalid conditional constructs in order to avoid some rare cases of infinite looping.
* Make the WPS parser check that it doesn't read more strings than it can.
* Increase the string buffer size (from 512 to 1024, to accomodate the TextBox WPS which uses a lot of unicode characters).


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13162 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nicolas Pennequin 2007-04-15 02:59:34 +00:00
parent ac94641606
commit 2e1169bdda
4 changed files with 55 additions and 32 deletions
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64
apps/gui/wps_parser.c
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@ -270,12 +270,29 @@ static int skip_end_of_line(const char *wps_bufptr)
}
/* Starts a new subline in the current line during parsing */
static void wps_start_new_subline(struct wps_data *data) {
static void wps_start_new_subline(struct wps_data *data)
{
data->num_sublines++;
data->sublines[data->num_sublines].first_token_idx = data->num_tokens;
data->lines[data->num_lines].num_sublines++;
}
static void close_conditionals(struct wps_data *data, int n)
{
int i;
for (i = 0; i < n; i++)
{
data->tokens[data->num_tokens].type = WPS_TOKEN_CONDITIONAL_END;
if (lastcond[level])
data->tokens[lastcond[level]].value.i = data->num_tokens;
lastcond[level] = 0;
data->num_tokens++;
data->tokens[condindex[level]].value.i = numoptions[level];
level--;
}
}
#ifdef HAVE_LCD_BITMAP
static int parse_statusbar_enable(const char *wps_bufptr,
@ -638,6 +655,7 @@ static bool wps_parse(struct wps_data *data, const char *wps_bufptr)
return false;
char *current_string = data->string_buffer;
int stringbuf_used = 0;
while(*wps_bufptr && data->num_tokens < WPS_MAX_TOKENS - 1
&& data->num_lines < WPS_MAX_LINES)
@ -652,6 +670,9 @@ static bool wps_parse(struct wps_data *data, const char *wps_bufptr)
/* Alternating sublines separator */
case ';':
if (level >= 0)
close_conditionals(data, level + 1);
if (data->num_sublines+1 < WPS_MAX_SUBLINES)
wps_start_new_subline(data);
else
@ -670,17 +691,7 @@ static bool wps_parse(struct wps_data *data, const char *wps_bufptr)
if (level < 0) /* not in a conditional, ignore the char */
break;
condlistend: /* close a conditional. sometimes we want to close them even when
we don't have a closing token, e.g. at the end of a line. */
data->tokens[data->num_tokens].type = WPS_TOKEN_CONDITIONAL_END;
if (lastcond[level])
data->tokens[lastcond[level]].value.i = data->num_tokens;
lastcond[level] = 0;
data->num_tokens++;
data->tokens[condindex[level]].value.i = numoptions[level];
level--;
close_conditionals(data, 1);
break;
/* Conditional list option */
@ -699,19 +710,17 @@ condlistend: /* close a conditional. sometimes we want to close them even when
/* Comment */
case '#':
if (level >= 0)
close_conditionals(data, level + 1);
wps_bufptr += skip_end_of_line(wps_bufptr);
break;
/* End of this line */
case '\n':
if (level >= 0)
{
/* We have unclosed conditionals, so we
close them before adding the EOL token */
wps_bufptr--;
goto condlistend;
break;
}
close_conditionals(data, level + 1);
wps_start_new_subline(data);
data->num_lines++; /* Start a new line */
@ -726,29 +735,36 @@ condlistend: /* close a conditional. sometimes we want to close them even when
/* String */
default:
if (data->num_strings < WPS_MAX_STRINGS)
if (data->num_strings < WPS_MAX_STRINGS
&& stringbuf_used < STRING_BUFFER_SIZE - 1)
{
data->tokens[data->num_tokens].type = WPS_TOKEN_STRING;
data->strings[data->num_strings] = current_string;
data->tokens[data->num_tokens].value.i = data->num_strings++;
data->tokens[data->num_tokens].value.i = data->num_strings;
data->num_tokens++;
/* Copy the first byte */
*current_string++ = *(wps_bufptr - 1);
stringbuf_used++;
/* continue until we hit something that ends the string */
/* continue until we hit something that ends the string
or we run out of memory */
while(wps_bufptr && *wps_bufptr != '#' &&
*wps_bufptr != '%' && *wps_bufptr != ';' &&
*wps_bufptr != '<' && *wps_bufptr != '>' &&
*wps_bufptr != '|' && *wps_bufptr != '\n')
*wps_bufptr != '|' && *wps_bufptr != '\n' &&
stringbuf_used < STRING_BUFFER_SIZE - 1)
{
*current_string++ = *wps_bufptr++;
stringbuf_used++;
}
/* null terminate the string */
*current_string++ = '\0';
}
stringbuf_used++;
data->num_strings++;
}
break;
}
}