util: split out escaping code into escape.[ch]

This really deserves its own file, given how much code this is now.

8 files changed, 544 insertions, 489 deletions

diff --git a/src/basic/escape.c b/src/basic/escape.c
new file mode 100644
index 0000000000..cf05ce10ef
--- /dev/null
+++ b/src/basic/escape.c
@@ -0,0 +1,480 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "utf8.h"
+#include "util.h"
+
+#include "escape.h"
+
+size_t cescape_char(char c, char *buf) {
+        char * buf_old = buf;
+
+        switch (c) {
+
+                case '\a':
+                        *(buf++) = '\\';
+                        *(buf++) = 'a';
+                        break;
+                case '\b':
+                        *(buf++) = '\\';
+                        *(buf++) = 'b';
+                        break;
+                case '\f':
+                        *(buf++) = '\\';
+                        *(buf++) = 'f';
+                        break;
+                case '\n':
+                        *(buf++) = '\\';
+                        *(buf++) = 'n';
+                        break;
+                case '\r':
+                        *(buf++) = '\\';
+                        *(buf++) = 'r';
+                        break;
+                case '\t':
+                        *(buf++) = '\\';
+                        *(buf++) = 't';
+                        break;
+                case '\v':
+                        *(buf++) = '\\';
+                        *(buf++) = 'v';
+                        break;
+                case '\\':
+                        *(buf++) = '\\';
+                        *(buf++) = '\\';
+                        break;
+                case '"':
+                        *(buf++) = '\\';
+                        *(buf++) = '"';
+                        break;
+                case '\'':
+                        *(buf++) = '\\';
+                        *(buf++) = '\'';
+                        break;
+
+                default:
+                        /* For special chars we prefer octal over
+                         * hexadecimal encoding, simply because glib's
+                         * g_strescape() does the same */
+                        if ((c < ' ') || (c >= 127)) {
+                                *(buf++) = '\\';
+                                *(buf++) = octchar((unsigned char) c >> 6);
+                                *(buf++) = octchar((unsigned char) c >> 3);
+                                *(buf++) = octchar((unsigned char) c);
+                        } else
+                                *(buf++) = c;
+                        break;
+        }
+
+        return buf - buf_old;
+}
+
+char *cescape(const char *s) {
+        char *r, *t;
+        const char *f;
+
+        assert(s);
+
+        /* Does C style string escaping. May be reversed with
+         * cunescape(). */
+
+        r = new(char, strlen(s)*4 + 1);
+        if (!r)
+                return NULL;
+
+        for (f = s, t = r; *f; f++)
+                t += cescape_char(*f, t);
+
+        *t = 0;
+
+        return r;
+}
+
+int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode) {
+        int r = 1;
+
+        assert(p);
+        assert(*p);
+        assert(ret);
+
+        /* Unescapes C style. Returns the unescaped character in ret,
+         * unless we encountered a \u sequence in which case the full
+         * unicode character is returned in ret_unicode, instead. */
+
+        if (length != (size_t) -1 && length < 1)
+                return -EINVAL;
+
+        switch (p[0]) {
+
+        case 'a':
+                *ret = '\a';
+                break;
+        case 'b':
+                *ret = '\b';
+                break;
+        case 'f':
+                *ret = '\f';
+                break;
+        case 'n':
+                *ret = '\n';
+                break;
+        case 'r':
+                *ret = '\r';
+                break;
+        case 't':
+                *ret = '\t';
+                break;
+        case 'v':
+                *ret = '\v';
+                break;
+        case '\\':
+                *ret = '\\';
+                break;
+        case '"':
+                *ret = '"';
+                break;
+        case '\'':
+                *ret = '\'';
+                break;
+
+        case 's':
+                /* This is an extension of the XDG syntax files */
+                *ret = ' ';
+                break;
+
+        case 'x': {
+                /* hexadecimal encoding */
+                int a, b;
+
+                if (length != (size_t) -1 && length < 3)
+                        return -EINVAL;
+
+                a = unhexchar(p[1]);
+                if (a < 0)
+                        return -EINVAL;
+
+                b = unhexchar(p[2]);
+                if (b < 0)
+                        return -EINVAL;
+
+                /* Don't allow NUL bytes */
+                if (a == 0 && b == 0)
+                        return -EINVAL;
+
+                *ret = (char) ((a << 4U) | b);
+                r = 3;
+                break;
+        }
+
+        case 'u': {
+                /* C++11 style 16bit unicode */
+
+                int a[4];
+                unsigned i;
+                uint32_t c;
+
+                if (length != (size_t) -1 && length < 5)
+                        return -EINVAL;
+
+                for (i = 0; i < 4; i++) {
+                        a[i] = unhexchar(p[1 + i]);
+                        if (a[i] < 0)
+                                return a[i];
+                }
+
+                c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3];
+
+                /* Don't allow 0 chars */
+                if (c == 0)
+                        return -EINVAL;
+
+                if (c < 128)
+                        *ret = c;
+                else {
+                        if (!ret_unicode)
+                                return -EINVAL;
+
+                        *ret = 0;
+                        *ret_unicode = c;
+                }
+
+                r = 5;
+                break;
+        }
+
+        case 'U': {
+                /* C++11 style 32bit unicode */
+
+                int a[8];
+                unsigned i;
+                uint32_t c;
+
+                if (length != (size_t) -1 && length < 9)
+                        return -EINVAL;
+
+                for (i = 0; i < 8; i++) {
+                        a[i] = unhexchar(p[1 + i]);
+                        if (a[i] < 0)
+                                return a[i];
+                }
+
+                c = ((uint32_t) a[0] << 28U) | ((uint32_t) a[1] << 24U) | ((uint32_t) a[2] << 20U) | ((uint32_t) a[3] << 16U) |
+                    ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] <<  8U) | ((uint32_t) a[6] <<  4U) |  (uint32_t) a[7];
+
+                /* Don't allow 0 chars */
+                if (c == 0)
+                        return -EINVAL;
+
+                /* Don't allow invalid code points */
+                if (!unichar_is_valid(c))
+                        return -EINVAL;
+
+                if (c < 128)
+                        *ret = c;
+                else {
+                        if (!ret_unicode)
+                                return -EINVAL;
+
+                        *ret = 0;
+                        *ret_unicode = c;
+                }
+
+                r = 9;
+                break;
+        }
+
+        case '0':
+        case '1':
+        case '2':
+        case '3':
+        case '4':
+        case '5':
+        case '6':
+        case '7': {
+                /* octal encoding */
+                int a, b, c;
+                uint32_t m;
+
+                if (length != (size_t) -1 && length < 3)
+                        return -EINVAL;
+
+                a = unoctchar(p[0]);
+                if (a < 0)
+                        return -EINVAL;
+
+                b = unoctchar(p[1]);
+                if (b < 0)
+                        return -EINVAL;
+
+                c = unoctchar(p[2]);
+                if (c < 0)
+                        return -EINVAL;
+
+                /* don't allow NUL bytes */
+                if (a == 0 && b == 0 && c == 0)
+                        return -EINVAL;
+
+                /* Don't allow bytes above 255 */
+                m = ((uint32_t) a << 6U) | ((uint32_t) b << 3U) | (uint32_t) c;
+                if (m > 255)
+                        return -EINVAL;
+
+                *ret = m;
+                r = 3;
+                break;
+        }
+
+        default:
+                return -EINVAL;
+        }
+
+        return r;
+}
+
+int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret) {
+        char *r, *t;
+        const char *f;
+        size_t pl;
+
+        assert(s);
+        assert(ret);
+
+        /* Undoes C style string escaping, and optionally prefixes it. */
+
+        pl = prefix ? strlen(prefix) : 0;
+
+        r = new(char, pl+length+1);
+        if (!r)
+                return -ENOMEM;
+
+        if (prefix)
+                memcpy(r, prefix, pl);
+
+        for (f = s, t = r + pl; f < s + length; f++) {
+                size_t remaining;
+                uint32_t u;
+                char c;
+                int k;
+
+                remaining = s + length - f;
+                assert(remaining > 0);
+
+                if (*f != '\\') {
+                        /* A literal literal, copy verbatim */
+                        *(t++) = *f;
+                        continue;
+                }
+
+                if (remaining == 1) {
+                        if (flags & UNESCAPE_RELAX) {
+                                /* A trailing backslash, copy verbatim */
+                                *(t++) = *f;
+                                continue;
+                        }
+
+                        free(r);
+                        return -EINVAL;
+                }
+
+                k = cunescape_one(f + 1, remaining - 1, &c, &u);
+                if (k < 0) {
+                        if (flags & UNESCAPE_RELAX) {
+                                /* Invalid escape code, let's take it literal then */
+                                *(t++) = '\\';
+                                continue;
+                        }
+
+                        free(r);
+                        return k;
+                }
+
+                if (c != 0)
+                        /* Non-Unicode? Let's encode this directly */
+                        *(t++) = c;
+                else
+                        /* Unicode? Then let's encode this in UTF-8 */
+                        t += utf8_encode_unichar(t, u);
+
+                f += k;
+        }
+
+        *t = 0;
+
+        *ret = r;
+        return t - r;
+}
+
+int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
+        return cunescape_length_with_prefix(s, length, NULL, flags, ret);
+}
+
+int cunescape(const char *s, UnescapeFlags flags, char **ret) {
+        return cunescape_length(s, strlen(s), flags, ret);
+}
+
+char *xescape(const char *s, const char *bad) {
+        char *r, *t;
+        const char *f;
+
+        /* Escapes all chars in bad, in addition to \ and all special
+         * chars, in \xFF style escaping. May be reversed with
+         * cunescape(). */
+
+        r = new(char, strlen(s) * 4 + 1);
+        if (!r)
+                return NULL;
+
+        for (f = s, t = r; *f; f++) {
+
+                if ((*f < ' ') || (*f >= 127) ||
+                    (*f == '\\') || strchr(bad, *f)) {
+                        *(t++) = '\\';
+                        *(t++) = 'x';
+                        *(t++) = hexchar(*f >> 4);
+                        *(t++) = hexchar(*f);
+                } else
+                        *(t++) = *f;
+        }
+
+        *t = 0;
+
+        return r;
+}
+
+static char *strcpy_backslash_escaped(char *t, const char *s, const char *bad) {
+        assert(bad);
+
+        for (; *s; s++) {
+                if (*s == '\\' || strchr(bad, *s))
+                        *(t++) = '\\';
+
+                *(t++) = *s;
+        }
+
+        return t;
+}
+
+char *shell_escape(const char *s, const char *bad) {
+        char *r, *t;
+
+        r = new(char, strlen(s)*2+1);
+        if (!r)
+                return NULL;
+
+        t = strcpy_backslash_escaped(r, s, bad);
+        *t = 0;
+
+        return r;
+}
+
+char *shell_maybe_quote(const char *s) {
+        const char *p;
+        char *r, *t;
+
+        assert(s);
+
+        /* Encloses a string in double quotes if necessary to make it
+         * OK as shell string. */
+
+        for (p = s; *p; p++)
+                if (*p <= ' ' ||
+                    *p >= 127 ||
+                    strchr(SHELL_NEED_QUOTES, *p))
+                        break;
+
+        if (!*p)
+                return strdup(s);
+
+        r = new(char, 1+strlen(s)*2+1+1);
+        if (!r)
+                return NULL;
+
+        t = r;
+        *(t++) = '"';
+        t = mempcpy(t, s, p - s);
+
+        t = strcpy_backslash_escaped(t, p, SHELL_NEED_ESCAPE);
+
+        *(t++)= '"';
+        *t = 0;
+
+        return r;
+}
diff --git a/src/basic/escape.h b/src/basic/escape.h
new file mode 100644
index 0000000000..85ba909081
--- /dev/null
+++ b/src/basic/escape.h
@@ -0,0 +1,48 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+#include <inttypes.h>
+
+/* What characters are special in the shell? */
+/* must be escaped outside and inside double-quotes */
+#define SHELL_NEED_ESCAPE "\"\\`$"
+/* can be escaped or double-quoted */
+#define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;"
+
+typedef enum UnescapeFlags {
+        UNESCAPE_RELAX = 1,
+} UnescapeFlags;
+
+char *cescape(const char *s);
+size_t cescape_char(char c, char *buf);
+
+int cunescape(const char *s, UnescapeFlags flags, char **ret);
+int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret);
+int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret);
+int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode);
+
+char *xescape(const char *s, const char *bad);
+
+char *shell_escape(const char *s, const char *bad);
+char *shell_maybe_quote(const char *s);
diff --git a/src/basic/extract-word.c b/src/basic/extract-word.c
index 5e74f1832b..52d2672390 100644
--- a/src/basic/extract-word.c
+++ b/src/basic/extract-word.c
@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include "escape.h"
 #include "utf8.h"
 #include "util.h"
 
diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 13a85e1158..65a6a6558b 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -21,10 +21,11 @@
 
 #include <unistd.h>
 
-#include "util.h"
+#include "ctype.h"
+#include "escape.h"
 #include "strv.h"
 #include "utf8.h"
-#include "ctype.h"
+#include "util.h"
 #include "fileio.h"
 
 int write_string_stream(FILE *f, const char *line, bool enforce_newline) {
diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index d8a94a4572..3199efeafd 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -17,21 +17,22 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <stdbool.h>
-#include <sys/types.h>
-#include <string.h>
-#include <stdio.h>
 #include <assert.h>
+#include <ctype.h>
 #include <errno.h>
-#include <unistd.h>
-#include <sys/wait.h>
 #include <signal.h>
-#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
 
+#include "escape.h"
 #include "fileio.h"
-#include "util.h"
 #include "log.h"
 #include "signal-util.h"
+#include "util.h"
 #include "process-util.h"
 
 int get_process_state(pid_t pid) {
diff --git a/src/basic/strv.c b/src/basic/strv.c
index 501d022cb9..446d4a5631 100644
--- a/src/basic/strv.c
+++ b/src/basic/strv.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <errno.h>
 
+#include "escape.h"
 #include "util.h"
 #include "strv.h"
 
diff --git a/src/basic/util.c b/src/basic/util.c
index 641e0b4d89..d6488f8fd6 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -77,6 +77,7 @@
 #include "def.h"
 #include "device-nodes.h"
 #include "env-util.h"
+#include "escape.h"
 #include "exit-status.h"
 #include "fileio.h"
 #include "formats-util.h"
@@ -96,8 +97,8 @@
 #include "strv.h"
 #include "terminal-util.h"
 #include "utf8.h"
-#include "util.h"
 #include "virt.h"
+#include "util.h"
 
 /* Put this test here for a lack of better place */
 assert_cc(EAGAIN == EWOULDBLOCK);
@@ -214,69 +215,6 @@ char* first_word(const char *s, const char *word) {
         return (char*) p;
 }
 
-size_t cescape_char(char c, char *buf) {
-        char * buf_old = buf;
-
-        switch (c) {
-
-                case '\a':
-                        *(buf++) = '\\';
-                        *(buf++) = 'a';
-                        break;
-                case '\b':
-                        *(buf++) = '\\';
-                        *(buf++) = 'b';
-                        break;
-                case '\f':
-                        *(buf++) = '\\';
-                        *(buf++) = 'f';
-                        break;
-                case '\n':
-                        *(buf++) = '\\';
-                        *(buf++) = 'n';
-                        break;
-                case '\r':
-                        *(buf++) = '\\';
-                        *(buf++) = 'r';
-                        break;
-                case '\t':
-                        *(buf++) = '\\';
-                        *(buf++) = 't';
-                        break;
-                case '\v':
-                        *(buf++) = '\\';
-                        *(buf++) = 'v';
-                        break;
-                case '\\':
-                        *(buf++) = '\\';
-                        *(buf++) = '\\';
-                        break;
-                case '"':
-                        *(buf++) = '\\';
-                        *(buf++) = '"';
-                        break;
-                case '\'':
-                        *(buf++) = '\\';
-                        *(buf++) = '\'';
-                        break;
-
-                default:
-                        /* For special chars we prefer octal over
-                         * hexadecimal encoding, simply because glib's
-                         * g_strescape() does the same */
-                        if ((c < ' ') || (c >= 127)) {
-                                *(buf++) = '\\';
-                                *(buf++) = octchar((unsigned char) c >> 6);
-                                *(buf++) = octchar((unsigned char) c >> 3);
-                                *(buf++) = octchar((unsigned char) c);
-                        } else
-                                *(buf++) = c;
-                        break;
-        }
-
-        return buf - buf_old;
-}
-
 int close_nointr(int fd) {
         assert(fd >= 0);
 
@@ -1566,338 +1504,6 @@ int undecchar(char c) {
         return -EINVAL;
 }
 
-char *cescape(const char *s) {
-        char *r, *t;
-        const char *f;
-
-        assert(s);
-
-        /* Does C style string escaping. May be reversed with
-         * cunescape(). */
-
-        r = new(char, strlen(s)*4 + 1);
-        if (!r)
-                return NULL;
-
-        for (f = s, t = r; *f; f++)
-                t += cescape_char(*f, t);
-
-        *t = 0;
-
-        return r;
-}
-
-int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode) {
-        int r = 1;
-
-        assert(p);
-        assert(*p);
-        assert(ret);
-
-        /* Unescapes C style. Returns the unescaped character in ret,
-         * unless we encountered a \u sequence in which case the full
-         * unicode character is returned in ret_unicode, instead. */
-
-        if (length != (size_t) -1 && length < 1)
-                return -EINVAL;
-
-        switch (p[0]) {
-
-        case 'a':
-                *ret = '\a';
-                break;
-        case 'b':
-                *ret = '\b';
-                break;
-        case 'f':
-                *ret = '\f';
-                break;
-        case 'n':
-                *ret = '\n';
-                break;
-        case 'r':
-                *ret = '\r';
-                break;
-        case 't':
-                *ret = '\t';
-                break;
-        case 'v':
-                *ret = '\v';
-                break;
-        case '\\':
-                *ret = '\\';
-                break;
-        case '"':
-                *ret = '"';
-                break;
-        case '\'':
-                *ret = '\'';
-                break;
-
-        case 's':
-                /* This is an extension of the XDG syntax files */
-                *ret = ' ';
-                break;
-
-        case 'x': {
-                /* hexadecimal encoding */
-                int a, b;
-
-                if (length != (size_t) -1 && length < 3)
-                        return -EINVAL;
-
-                a = unhexchar(p[1]);
-                if (a < 0)
-                        return -EINVAL;
-
-                b = unhexchar(p[2]);
-                if (b < 0)
-                        return -EINVAL;
-
-                /* Don't allow NUL bytes */
-                if (a == 0 && b == 0)
-                        return -EINVAL;
-
-                *ret = (char) ((a << 4U) | b);
-                r = 3;
-                break;
-        }
-
-        case 'u': {
-                /* C++11 style 16bit unicode */
-
-                int a[4];
-                unsigned i;
-                uint32_t c;
-
-                if (length != (size_t) -1 && length < 5)
-                        return -EINVAL;
-
-                for (i = 0; i < 4; i++) {
-                        a[i] = unhexchar(p[1 + i]);
-                        if (a[i] < 0)
-                                return a[i];
-                }
-
-                c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3];
-
-                /* Don't allow 0 chars */
-                if (c == 0)
-                        return -EINVAL;
-
-                if (c < 128)
-                        *ret = c;
-                else {
-                        if (!ret_unicode)
-                                return -EINVAL;
-
-                        *ret = 0;
-                        *ret_unicode = c;
-                }
-
-                r = 5;
-                break;
-        }
-
-        case 'U': {
-                /* C++11 style 32bit unicode */
-
-                int a[8];
-                unsigned i;
-                uint32_t c;
-
-                if (length != (size_t) -1 && length < 9)
-                        return -EINVAL;
-
-                for (i = 0; i < 8; i++) {
-                        a[i] = unhexchar(p[1 + i]);
-                        if (a[i] < 0)
-                                return a[i];
-                }
-
-                c = ((uint32_t) a[0] << 28U) | ((uint32_t) a[1] << 24U) | ((uint32_t) a[2] << 20U) | ((uint32_t) a[3] << 16U) |
-                    ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] <<  8U) | ((uint32_t) a[6] <<  4U) |  (uint32_t) a[7];
-
-                /* Don't allow 0 chars */
-                if (c == 0)
-                        return -EINVAL;
-
-                /* Don't allow invalid code points */
-                if (!unichar_is_valid(c))
-                        return -EINVAL;
-
-                if (c < 128)
-                        *ret = c;
-                else {
-                        if (!ret_unicode)
-                                return -EINVAL;
-
-                        *ret = 0;
-                        *ret_unicode = c;
-                }
-
-                r = 9;
-                break;
-        }
-
-        case '0':
-        case '1':
-        case '2':
-        case '3':
-        case '4':
-        case '5':
-        case '6':
-        case '7': {
-                /* octal encoding */
-                int a, b, c;
-                uint32_t m;
-
-                if (length != (size_t) -1 && length < 3)
-                        return -EINVAL;
-
-                a = unoctchar(p[0]);
-                if (a < 0)
-                        return -EINVAL;
-
-                b = unoctchar(p[1]);
-                if (b < 0)
-                        return -EINVAL;
-
-                c = unoctchar(p[2]);
-                if (c < 0)
-                        return -EINVAL;
-
-                /* don't allow NUL bytes */
-                if (a == 0 && b == 0 && c == 0)
-                        return -EINVAL;
-
-                /* Don't allow bytes above 255 */
-                m = ((uint32_t) a << 6U) | ((uint32_t) b << 3U) | (uint32_t) c;
-                if (m > 255)
-                        return -EINVAL;
-
-                *ret = m;
-                r = 3;
-                break;
-        }
-
-        default:
-                return -EINVAL;
-        }
-
-        return r;
-}
-
-int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret) {
-        char *r, *t;
-        const char *f;
-        size_t pl;
-
-        assert(s);
-        assert(ret);
-
-        /* Undoes C style string escaping, and optionally prefixes it. */
-
-        pl = prefix ? strlen(prefix) : 0;
-
-        r = new(char, pl+length+1);
-        if (!r)
-                return -ENOMEM;
-
-        if (prefix)
-                memcpy(r, prefix, pl);
-
-        for (f = s, t = r + pl; f < s + length; f++) {
-                size_t remaining;
-                uint32_t u;
-                char c;
-                int k;
-
-                remaining = s + length - f;
-                assert(remaining > 0);
-
-                if (*f != '\\') {
-                        /* A literal literal, copy verbatim */
-                        *(t++) = *f;
-                        continue;
-                }
-
-                if (remaining == 1) {
-                        if (flags & UNESCAPE_RELAX) {
-                                /* A trailing backslash, copy verbatim */
-                                *(t++) = *f;
-                                continue;
-                        }
-
-                        free(r);
-                        return -EINVAL;
-                }
-
-                k = cunescape_one(f + 1, remaining - 1, &c, &u);
-                if (k < 0) {
-                        if (flags & UNESCAPE_RELAX) {
-                                /* Invalid escape code, let's take it literal then */
-                                *(t++) = '\\';
-                                continue;
-                        }
-
-                        free(r);
-                        return k;
-                }
-
-                if (c != 0)
-                        /* Non-Unicode? Let's encode this directly */
-                        *(t++) = c;
-                else
-                        /* Unicode? Then let's encode this in UTF-8 */
-                        t += utf8_encode_unichar(t, u);
-
-                f += k;
-        }
-
-        *t = 0;
-
-        *ret = r;
-        return t - r;
-}
-
-int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
-        return cunescape_length_with_prefix(s, length, NULL, flags, ret);
-}
-
-int cunescape(const char *s, UnescapeFlags flags, char **ret) {
-        return cunescape_length(s, strlen(s), flags, ret);
-}
-
-char *xescape(const char *s, const char *bad) {
-        char *r, *t;
-        const char *f;
-
-        /* Escapes all chars in bad, in addition to \ and all special
-         * chars, in \xFF style escaping. May be reversed with
-         * cunescape(). */
-
-        r = new(char, strlen(s) * 4 + 1);
-        if (!r)
-                return NULL;
-
-        for (f = s, t = r; *f; f++) {
-
-                if ((*f < ' ') || (*f >= 127) ||
-                    (*f == '\\') || strchr(bad, *f)) {
-                        *(t++) = '\\';
-                        *(t++) = 'x';
-                        *(t++) = hexchar(*f >> 4);
-                        *(t++) = hexchar(*f);
-                } else
-                        *(t++) = *f;
-        }
-
-        *t = 0;
-
-        return r;
-}
-
 char *ascii_strlower(char *t) {
         char *p;
 
@@ -6242,66 +5848,6 @@ int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char
         return 0;
 }
 
-static char *strcpy_backslash_escaped(char *t, const char *s, const char *bad) {
-        assert(bad);
-
-        for (; *s; s++) {
-                if (*s == '\\' || strchr(bad, *s))
-                        *(t++) = '\\';
-
-                *(t++) = *s;
-        }
-
-        return t;
-}
-
-char *shell_escape(const char *s, const char *bad) {
-        char *r, *t;
-
-        r = new(char, strlen(s)*2+1);
-        if (!r)
-                return NULL;
-
-        t = strcpy_backslash_escaped(r, s, bad);
-        *t = 0;
-
-        return r;
-}
-
-char *shell_maybe_quote(const char *s) {
-        const char *p;
-        char *r, *t;
-
-        assert(s);
-
-        /* Encloses a string in double quotes if necessary to make it
-         * OK as shell string. */
-
-        for (p = s; *p; p++)
-                if (*p <= ' ' ||
-                    *p >= 127 ||
-                    strchr(SHELL_NEED_QUOTES, *p))
-                        break;
-
-        if (!*p)
-                return strdup(s);
-
-        r = new(char, 1+strlen(s)*2+1+1);
-        if (!r)
-                return NULL;
-
-        t = r;
-        *(t++) = '"';
-        t = mempcpy(t, s, p - s);
-
-        t = strcpy_backslash_escaped(t, p, SHELL_NEED_ESCAPE);
-
-        *(t++)= '"';
-        *t = 0;
-
-        return r;
-}
-
 int parse_mode(const char *s, mode_t *ret) {
         char *x;
         long l;
diff --git a/src/basic/util.h b/src/basic/util.h
index 132e6f862b..6674111145 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -53,12 +53,6 @@
 #define COMMENTS   "#;"
 #define GLOB_CHARS "*?["
 
-/* What characters are special in the shell? */
-/* must be escaped outside and inside double-quotes */
-#define SHELL_NEED_ESCAPE "\"\\`$"
-/* can be escaped or double-quoted */
-#define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;"
-
 #define FORMAT_BYTES_MAX 8
 
 size_t page_size(void) _pure_;
@@ -260,20 +254,6 @@ int unbase32hexchar(char c) _const_;
 char base64char(int x) _const_;
 int unbase64char(char c) _const_;
 
-char *cescape(const char *s);
-size_t cescape_char(char c, char *buf);
-
-typedef enum UnescapeFlags {
-        UNESCAPE_RELAX = 1,
-} UnescapeFlags;
-
-int cunescape(const char *s, UnescapeFlags flags, char **ret);
-int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret);
-int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret);
-int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode);
-
-char *xescape(const char *s, const char *bad);
-
 char *ascii_strlower(char *path);
 
 bool dirent_is_file(const struct dirent *de) _pure_;
@@ -924,9 +904,6 @@ void cmsg_close_all(struct msghdr *mh);
 
 int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath);
 
-char *shell_escape(const char *s, const char *bad);
-char *shell_maybe_quote(const char *s);
-
 int parse_mode(const char *s, mode_t *ret);
 
 int mount_move_root(const char *path);