sunrpc/cache: convert to use string_escape_str()

There is nice kernel helper to escape a given strings by provided rules. Let's
use it instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[bfields@redhat.com: fix length calculation]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 6 insertions, 20 deletions

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 066362141133..33fb105d4352 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -20,6 +20,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/string_helpers.h>
 #include <asm/uaccess.h>
 #include <linux/poll.h>
 #include <linux/seq_file.h>
@@ -1067,30 +1068,15 @@ void qword_add(char **bpp, int *lp, char *str)
 {
         char *bp = *bpp;
         int len = *lp;
-        char c;
+        int ret;
 
         if (len < 0) return;
 
-        while ((c=*str++) && len)
-                switch(c) {
-                case ' ':
-                case '\t':
-                case '\n':
-                case '\\':
-                        if (len >= 4) {
-                                *bp++ = '\\';
-                                *bp++ = '0' + ((c & 0300)>>6);
-                                *bp++ = '0' + ((c & 0070)>>3);
-                                *bp++ = '0' + ((c & 0007)>>0);
-                        }
-                        len -= 4;
-                        break;
-                default:
-                        *bp++ = c;
-                        len--;
-                }
-        if (c || len <1) len = -1;
+        ret = string_escape_str(str, &bp, len, ESCAPE_OCTAL, "\\ \n\t");
+        if (ret < 0 || ret == len)
+                len = -1;
         else {
+                len -= ret;
                 *bp++ = ' ';
                 len--;
         }