- add a few basic tests for pidof(8)

[oweals/busybox.git] / libbb / process_escape_sequence.c

diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c
index f5ac500fafb42e6f5f05a502a5af558fb6a30b9f..28b1e3697ba80314962569e5617b56cc07cd2c79 100644 (file)
--- a/libbb/process_escape_sequence.c
+++ b/libbb/process_escape_sequence.c
@@ -24,8 +24,15 @@
 
 #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[] = {
@@ -37,24 +44,47 @@ char bb_process_escape_sequence(const char **ptr)
        unsigned int num_digits;
        unsigned int r;
        unsigned int n;
+       unsigned int d;
+       unsigned int base;
 
-       n = 0;
+       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;
@@ -68,6 +98,7 @@ char bb_process_escape_sequence(const char **ptr)
        }
 
        *ptr = q;
+
        return (char) n;
 }