/*
* Utility routines.
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * isn't something I'm going to worry about... If you wrote something
- * here, please feel free to acknowledge your work.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
- * Permission has been granted to redistribute this code under the GPL.
+ * Copyright (C) Manuel Novoa III <mjn3@codepoet.org>
+ * and Vladimir Oleynik <dzo@simtreas.ru>
*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
-#include <stdio.h>
-#include <limits.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 process_escape_sequence(char **ptr)
+char FAST_FUNC bb_process_escape_sequence(const char **ptr)
{
- static const char charmap[] = {
- 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
- '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
+ const char *q;
+ unsigned num_digits;
+ unsigned n;
+ unsigned base;
- const char *p;
- char *q;
- int num_digits;
- unsigned int n;
+ num_digits = n = 0;
+ base = 8;
+ q = *ptr;
- n = 0;
- q = *ptr;
+ if (WANT_HEX_ESCAPES && *q == 'x') {
+ ++q;
+ base = 16;
+ ++num_digits;
+ }
- for ( num_digits = 0 ; num_digits < 3 ; ++num_digits) {
- if ((*q < '0') || (*q > '7')) { /* not a digit? */
- break;
- }
- n = n * 8 + (*q++ - '0');
- }
+ /* bash requires leading 0 in octal escapes:
+ * \02 works, \2 does not (prints \ and 2).
+ * We treat \2 as a valid octal escape sequence. */
+ do {
+ unsigned r;
+ unsigned d = (unsigned char)(*q) - '0';
+#if WANT_HEX_ESCAPES
+ if (d >= 10) {
+ d = (unsigned char)_tolower(*q) - 'a';
+ //d += 10;
+ /* The above would map 'A'-'F' and 'a'-'f' to 10-15,
+ * however, some chars like '@' would map to 9 < base.
+ * Do not allow that, map invalid chars to N > base:
+ */
+ if ((int)d >= 0)
+ d += 10;
+ }
+#endif
+ if (d >= base) {
+ if (WANT_HEX_ESCAPES && base == 16) {
+ --num_digits;
+ if (num_digits == 0) {
+ /* \x<bad_char>: return '\',
+ * leave ptr pointing to x */
+ return '\\';
+ }
+ }
+ break;
+ }
- if (num_digits == 0) { /* mnemonic escape sequence? */
- for (p=charmap ; *p ; p++) {
- if (*p == *q) {
- q++;
- break;
- }
- }
- n = *(p+(sizeof(charmap)/2));
- }
+ r = n * base + d;
+ if (r > UCHAR_MAX) {
+ break;
+ }
- /* doesn't hurt to fall through to here from mnemonic case */
- if (n > UCHAR_MAX) { /* is octal code too big for a char? */
- n /= 8; /* adjust value and */
- --q; /* back up one char */
- }
+ n = r;
+ ++q;
+ } while (++num_digits < 3);
- *ptr = q;
- return (char) n;
-}
+ if (num_digits == 0) {
+ /* Not octal or hex escape sequence.
+ * Is it one-letter one? */
+ /* bash builtin "echo -e '\ec'" interprets \e as ESC,
+ * but coreutils "/bin/echo -e '\ec'" does not.
+ * Manpages tend to support coreutils way.
+ * Update: coreutils added support for \e on 28 Oct 2009. */
+ static const char charmap[] ALIGN1 = {
+ 'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\', '\0',
+ '\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\', '\\',
+ };
+ const char *p = charmap;
+ do {
+ if (*p == *q) {
+ q++;
+ break;
+ }
+ } while (*++p != '\0');
+ /* p points to found escape char or NUL,
+ * advance it and find what it translates to.
+ * Note that \NUL and unrecognized sequence \z return '\'
+ * and leave ptr pointing to NUL or z. */
+ n = p[sizeof(charmap) / 2];
+ }
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+ *ptr = q;
+
+ return (char) n;
+}
+
+char* FAST_FUNC strcpy_and_process_escape_sequences(char *dst, const char *src)
+{
+ while (1) {
+ char c, c1;
+ c = c1 = *src++;
+ if (c1 == '\\')
+ c1 = bb_process_escape_sequence(&src);
+ *dst = c1;
+ if (c == '\0')
+ return dst;
+ dst++;
+ }
+}
projects / oweals / busybox.git / blobdiff