lib / string_helpers: introduce string_escape_mem()

This is almost the opposite function to string_unescape().  Nevertheless
it handles \0 and could be used for any byte buffer.

The documentation is supplied together with the function prototype.

The test cases covers most of the scenarios and would be expanded later
on.

[akpm@linux-foundation.org: avoid 1k stack consumption]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "John W . Linville" <linville@tuxdriver.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Joe Perches <joe@perches.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 74ec60469640..58b78ba57439 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -8,6 +8,8 @@
 #include <linux/math64.h>
 #include <linux/export.h>
 #include <linux/ctype.h>
+#include <linux/errno.h>
+#include <linux/string.h>
 #include <linux/string_helpers.h>
 
 /**
@@ -240,3 +242,275 @@ int string_unescape(char *src, char *dst, size_t size, unsigned int flags)
         return out - dst;
 }
 EXPORT_SYMBOL(string_unescape);
+
+static int escape_passthrough(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+
+        if (*osz < 1)
+                return -ENOMEM;
+
+        *out++ = c;
+
+        *dst = out;
+        *osz -= 1;
+
+        return 1;
+}
+
+static int escape_space(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+        unsigned char to;
+
+        if (*osz < 2)
+                return -ENOMEM;
+
+        switch (c) {
+        case '\n':
+                to = 'n';
+                break;
+        case '\r':
+                to = 'r';
+                break;
+        case '\t':
+                to = 't';
+                break;
+        case '\v':
+                to = 'v';
+                break;
+        case '\f':
+                to = 'f';
+                break;
+        default:
+                return 0;
+        }
+
+        *out++ = '\\';
+        *out++ = to;
+
+        *dst = out;
+        *osz -= 2;
+
+        return 1;
+}
+
+static int escape_special(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+        unsigned char to;
+
+        if (*osz < 2)
+                return -ENOMEM;
+
+        switch (c) {
+        case '\\':
+                to = '\\';
+                break;
+        case '\a':
+                to = 'a';
+                break;
+        case '\e':
+                to = 'e';
+                break;
+        default:
+                return 0;
+        }
+
+        *out++ = '\\';
+        *out++ = to;
+
+        *dst = out;
+        *osz -= 2;
+
+        return 1;
+}
+
+static int escape_null(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+
+        if (*osz < 2)
+                return -ENOMEM;
+
+        if (c)
+                return 0;
+
+        *out++ = '\\';
+        *out++ = '0';
+
+        *dst = out;
+        *osz -= 2;
+
+        return 1;
+}
+
+static int escape_octal(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+
+        if (*osz < 4)
+                return -ENOMEM;
+
+        *out++ = '\\';
+        *out++ = ((c >> 6) & 0x07) + '0';
+        *out++ = ((c >> 3) & 0x07) + '0';
+        *out++ = ((c >> 0) & 0x07) + '0';
+
+        *dst = out;
+        *osz -= 4;
+
+        return 1;
+}
+
+static int escape_hex(unsigned char c, char **dst, size_t *osz)
+{
+        char *out = *dst;
+
+        if (*osz < 4)
+                return -ENOMEM;
+
+        *out++ = '\\';
+        *out++ = 'x';
+        *out++ = hex_asc_hi(c);
+        *out++ = hex_asc_lo(c);
+
+        *dst = out;
+        *osz -= 4;
+
+        return 1;
+}
+
+/**
+ * string_escape_mem - quote characters in the given memory buffer
+ * @src:        source buffer (unescaped)
+ * @isz:        source buffer size
+ * @dst:        destination buffer (escaped)
+ * @osz:        destination buffer size
+ * @flags:      combination of the flags (bitwise OR):
+ *      %ESCAPE_SPACE:
+ *              '\f' - form feed
+ *              '\n' - new line
+ *              '\r' - carriage return
+ *              '\t' - horizontal tab
+ *              '\v' - vertical tab
+ *      %ESCAPE_SPECIAL:
+ *              '\\' - backslash
+ *              '\a' - alert (BEL)
+ *              '\e' - escape
+ *      %ESCAPE_NULL:
+ *              '\0' - null
+ *      %ESCAPE_OCTAL:
+ *              '\NNN' - byte with octal value NNN (3 digits)
+ *      %ESCAPE_ANY:
+ *              all previous together
+ *      %ESCAPE_NP:
+ *              escape only non-printable characters (checked by isprint)
+ *      %ESCAPE_ANY_NP:
+ *              all previous together
+ *      %ESCAPE_HEX:
+ *              '\xHH' - byte with hexadecimal value HH (2 digits)
+ * @esc:        NULL-terminated string of characters any of which, if found in
+ *              the source, has to be escaped
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *      1. The character is matched to the printable class, if asked, and in
+ *         case of match it passes through to the output.
+ *      2. The character is not matched to the one from @esc string and thus
+ *         must go as is to the output.
+ *      3. The character is checked if it falls into the class given by @flags.
+ *         %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ *         character. Note that they actually can't go together, otherwise
+ *         %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs.
+ *
+ * Return:
+ * The amount of the characters processed to the destination buffer, or
+ * %-ENOMEM if the size of buffer is not enough to put an escaped character is
+ * returned.
+ *
+ * Even in the case of error @dst pointer will be updated to point to the byte
+ * after the last processed character.
+ */
+int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
+                      unsigned int flags, const char *esc)
+{
+        char *out = *dst, *p = out;
+        bool is_dict = esc && *esc;
+        int ret = 0;
+
+        while (isz--) {
+                unsigned char c = *src++;
+
+                /*
+                 * Apply rules in the following sequence:
+                 *      - the character is printable, when @flags has
+                 *        %ESCAPE_NP bit set
+                 *      - the @esc string is supplied and does not contain a
+                 *        character under question
+                 *      - the character doesn't fall into a class of symbols
+                 *        defined by given @flags
+                 * In these cases we just pass through a character to the
+                 * output buffer.
+                 */
+                if ((flags & ESCAPE_NP && isprint(c)) ||
+                    (is_dict && !strchr(esc, c))) {
+                        /* do nothing */
+                } else {
+                        if (flags & ESCAPE_SPACE) {
+                                ret = escape_space(c, &p, &osz);
+                                if (ret < 0)
+                                        break;
+                                if (ret > 0)
+                                        continue;
+                        }
+
+                        if (flags & ESCAPE_SPECIAL) {
+                                ret = escape_special(c, &p, &osz);
+                                if (ret < 0)
+                                        break;
+                                if (ret > 0)
+                                        continue;
+                        }
+
+                        if (flags & ESCAPE_NULL) {
+                                ret = escape_null(c, &p, &osz);
+                                if (ret < 0)
+                                        break;
+                                if (ret > 0)
+                                        continue;
+                        }
+
+                        /* ESCAPE_OCTAL and ESCAPE_HEX always go last */
+                        if (flags & ESCAPE_OCTAL) {
+                                ret = escape_octal(c, &p, &osz);
+                                if (ret < 0)
+                                        break;
+                                continue;
+                        }
+                        if (flags & ESCAPE_HEX) {
+                                ret = escape_hex(c, &p, &osz);
+                                if (ret < 0)
+                                        break;
+                                continue;
+                        }
+                }
+
+                ret = escape_passthrough(c, &p, &osz);
+                if (ret < 0)
+                        break;
+        }
+
+        *dst = p;
+
+        if (ret < 0)
+                return ret;
+
+        return p - out;
+}
+EXPORT_SYMBOL(string_escape_mem);