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imagemap: Don't use strcpy() in unescape_text() (#649172) 

strcpy() doesn't like overlapping strings and this causes other failures
in this unescaping code.

Also cleanup the code to follow our coding style.
This commit is contained in:
Mukund Sivaraman 2013-04-11 14:11:00 +05:30
parent bc8a6123c7
commit db95e20b0b
1 changed files with 31 additions and 20 deletions
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51
plug-ins/imagemap/imap_csim.y
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@ -38,7 +38,7 @@
extern int csim_lex(void);
extern int csim_restart(FILE *csim_in);
static void csim_error(char* s);
static gchar* unescape_text(gchar *);
static gchar * unescape_text(gchar *input);
static enum {UNDEFINED, RECTANGLE, CIRCLE, POLYGON} current_type;
static Object_t *current_object;
@ -353,33 +353,44 @@ static gchar*
unescape_text (gchar *input)
{
/*
* We "unescape" simple things "in place", knowing that unescaped strings always are
* shorter than the original input.
* We "unescape" simple things "in place", knowing that unescaped
* strings always are shorter than the original input.
*
* It is a shame there is no g_markup_unescape_text() function, but instead you have
* to create a full GMarkupParser/Context.
* It is a shame there is no g_markup_unescape_text() function, but
* instead you have to create a full GMarkupParser/Context.
*/
struct token {
const char *enc, unenc;
const char *escaped;
const char unescaped;
};
const struct token tab[] = {
{ """, '"' },
{ "'", '\'' },
{ "&", '&' },
{ "&lt;", '<' },
{ "&gt;", '>' }
{ "&quot;", '"' },
{ "&apos;", '\'' },
{ "&amp;", '&' },
{ "&lt;", '<' },
{ "&gt;", '>' }
};
size_t i;
for (i = 0; i < sizeof(tab)/sizeof(tab[0]); i++) {
char *p;
for (p = strstr(input, tab[i].enc); p != NULL; p = strstr(p, tab[i].enc)) {
*p++ = tab[i].unenc;
strcpy(p, p + strlen(tab[i].enc)-1);
if (*p == 0)
break;
size_t i;
for (i = 0; i < (sizeof tab / sizeof tab[0]); i++)
{
const size_t escaped_len = strlen (tab[i].escaped);
char *p;
/* FIXME: The following code does not perform a UTF-8 substring
search. */
for (p = strstr (input, tab[i].escaped);
p != NULL;
p = strstr (p, tab[i].escaped))
{
size_t copy_len;
*p++ = tab[i].unescaped;
copy_len = strlen (p) - escaped_len + 2;
memmove (p, p + escaped_len - 1, copy_len);
if (*p == 0)
break;
}
}
}
return input;
}