dynamic_debug: reuse generic string_unescape function

There is kernel function to do the job in generic way. Let's use it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jason Baron <jbaron@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 43 deletions

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 46032453abd5..99fec3ae405a 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -24,6 +24,7 @@
 #include <linux/sysctl.h>
 #include <linux/ctype.h>
 #include <linux/string.h>
+#include <linux/string_helpers.h>
 #include <linux/uaccess.h>
 #include <linux/dynamic_debug.h>
 #include <linux/debugfs.h>
@@ -276,47 +277,6 @@ static inline int parse_lineno(const char *str, unsigned int *val)
         return 0;
 }
 
-/*
- * Undo octal escaping in a string, inplace.  This is useful to
- * allow the user to express a query which matches a format
- * containing embedded spaces.
- */
-static char *unescape(char *str)
-{
-        char *in = str;
-        char *out = str;
-
-        while (*in) {
-                if (*in == '\\') {
-                        if (in[1] == '\\') {
-                                *out++ = '\\';
-                                in += 2;
-                                continue;
-                        } else if (in[1] == 't') {
-                                *out++ = '\t';
-                                in += 2;
-                                continue;
-                        } else if (in[1] == 'n') {
-                                *out++ = '\n';
-                                in += 2;
-                                continue;
-                        } else if (isodigit(in[1]) &&
-                                   isodigit(in[2]) &&
-                                   isodigit(in[3])) {
-                                *out++ = (((in[1] - '0') << 6) |
-                                          ((in[2] - '0') << 3) |
-                                          (in[3] - '0'));
-                                in += 4;
-                                continue;
-                        }
-                }
-                *out++ = *in++;
-        }
-        *out = '\0';
-
-        return str;
-}
-
 static int check_set(const char **dest, char *src, char *name)
 {
         int rc = 0;
@@ -370,8 +330,10 @@ static int ddebug_parse_query(char *words[], int nwords,
                 } else if (!strcmp(words[i], "module")) {
                         rc = check_set(&query->module, words[i+1], "module");
                 } else if (!strcmp(words[i], "format")) {
-                        rc = check_set(&query->format, unescape(words[i+1]),
-                                       "format");
+                        string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
+                                                            UNESCAPE_OCTAL |
+                                                            UNESCAPE_SPECIAL);
+                        rc = check_set(&query->format, words[i+1], "format");
                 } else if (!strcmp(words[i], "line")) {
                         char *first = words[i+1];
                         char *last = strchr(first, '-');