/* Internal function: ensure that an fseek() is called on a file pointer in
between reading and writing operations, and vice versa. This will only come up
for ReadWrite or WriteAppend files. */
static void
ensure_file_operation(strid_t str, glui32 op)
{
if(str->lastop != 0 && str->lastop != op)
{
long pos = ftell(str->file_pointer);
if(pos == -1)
WARNING_S("ftell() failed", g_strerror(errno));
if(fseek(str->file_pointer, pos, SEEK_SET) != 0)
WARNING_S("fseek() failed", g_strerror(errno));
}
str->lastop = op; /* Not 0, because we are about to do the operation anyway */
}
/* Internal function: convert a null-terminated UTF-8 string to a
null-terminated UCS4 string. If items_written is not NULL it will be filled with
the number of code points returned, not counting the terminator. The returned
string must be freed afterwards. Returns NULL on error. */
gunichar *
convert_utf8_to_ucs4(const gchar *s, glong *items_written)
{
gunichar *retval = g_utf8_to_ucs4_fast(s, -1, items_written);
if(retval == NULL)
WARNING_S("Error during utf8->unicode conversion of string", s);
return retval;
}
/* Internal function: Convert a Unicode buffer to a null-terminated UTF-8
string. The returned string must be freed afterwards. Returns NULL on error. */
gchar *
convert_ucs4_to_utf8(const gunichar *buf, const glong len)
{
GError *error = NULL;
gchar *retval = g_ucs4_to_utf8(buf, len, NULL, NULL, &error);
if(retval == NULL)
WARNING_S("Error during unicode->utf8 conversion", error->message);
return retval;
}