src/basic/escape.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2010 Lennart Poettering
   8 ***/
   9
  10 #include <inttypes.h>
  11 #include <stddef.h>
  12 #include <stdint.h>
  13 #include <sys/types.h>
  14 #include <uchar.h>
  15
  16 #include "string-util.h"
  17 #include "missing.h"
  18
  19 /* What characters are special in the shell? */
  20 /* must be escaped outside and inside double-quotes */
  21 #define SHELL_NEED_ESCAPE "\"\\`$"
  22
  23 /* Those that can be escaped or double-quoted.
  24  *
  25  * Stricly speaking, ! does not need to be escaped, except in interactive
  26  * mode, but let's be extra nice to the user and quote ! in case this
  27  * output is ever used in interactive mode. */
  28 #define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;!"
  29
  30 /* Note that we assume control characters would need to be escaped too in
  31  * addition to the "special" characters listed here, if they appear in the
  32  * string. Current users disallow control characters. Also '"' shall not
  33  * be escaped.
  34  */
  35 #define SHELL_NEED_ESCAPE_POSIX "\\\'"
  36
  37 typedef enum UnescapeFlags {
  38         UNESCAPE_RELAX = 1,
  39 } UnescapeFlags;
  40
  41 typedef enum EscapeStyle {
  42         ESCAPE_BACKSLASH = 1,
  43         ESCAPE_POSIX = 2,
  44 } EscapeStyle;
  45
  46 char *cescape(const char *s);
  47 char *cescape_length(const char *s, size_t n);
  48 size_t cescape_char(char c, char *buf);
  49
  50 int cunescape(const char *s, UnescapeFlags flags, char **ret);
  51 int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret);
  52 int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret);
  53 int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit);
  54
  55 char *xescape(const char *s, const char *bad);
  56 char *octescape(const char *s, size_t len);
  57
  58 char *shell_escape(const char *s, const char *bad);
  59 char* shell_maybe_quote(const char *s, EscapeStyle style);