* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- *
+ *
*/
#include <stdio.h>
#include <limits.h>
+#include <ctype.h>
#include "libbb.h"
+#define WANT_HEX_ESCAPES 1
+
+/* Usual "this only works for ascii compatible encodings" disclaimer. */
+#undef _tolower
+#define _tolower(X) ((X)|((char) 0x20))
+
char bb_process_escape_sequence(const char **ptr)
{
static const char charmap[] = {
unsigned int num_digits;
unsigned int r;
unsigned int n;
-
- n = 0;
+ unsigned int d;
+ unsigned int base;
+
+ num_digits = n = 0;
+ base = 8;
q = *ptr;
- num_digits = 0;
+#ifdef WANT_HEX_ESCAPES
+ if (*q == 'x') {
+ ++q;
+ base = 16;
+ ++num_digits;
+ }
+#endif
+
do {
- if (((unsigned int)(*q - '0')) <= 7) {
- r = n * 8 + (*q - '0');
- if (r <= UCHAR_MAX) {
- n = r;
- ++q;
- if (++num_digits < 3) {
- continue;
- }
+ d = (unsigned int)(*q - '0');
+#ifdef WANT_HEX_ESCAPES
+ if (d >= 10) {
+ d = ((unsigned int)(_tolower(*q) - 'a')) + 10;
+ }
+#endif
+
+ if (d >= base) {
+#ifdef WANT_HEX_ESCAPES
+ if ((base == 16) && (!--num_digits)) {
+/* return '\\'; */
+ --q;
}
+#endif
+ break;
+ }
+
+ r = n * base + d;
+ if (r > UCHAR_MAX) {
+ break;
}
- break;
- } while (1);
+
+ n = r;
+ ++q;
+ } while (++num_digits < 3);
if (num_digits == 0) { /* mnemonic escape sequence? */
p = charmap;
}
*ptr = q;
+
return (char) n;
}