1 files changed, 55 insertions, 0 deletions

diff --git a/src/lib/common.c b/src/lib/common.c
index 111366782..338e9316c 100644
--- a/src/lib/common.c
+++ b/src/lib/common.c
@@ -404,6 +404,61 @@ char *replace_cntrl_chars(const char *str, char c) {
         return rv;
 }
 
+char *escape_cntrl_chars(const char *str) {
+        if (str) {
+                unsigned int cntrl_chars = 0;
+                const char *c = str;
+                while (*c) {
+                        switch (*c++) {
+                                case '\b':
+                                case '\a':
+                                case '\e':
+                                case '\f':
+                                case '\n':
+                                case '\r':
+                                case '\t':
+                                case '\v':
+                                case '\"':
+                                case '\'':
+                                case '\?':
+                                case '\\':
+                                        ++cntrl_chars;
+                                default: break;
+                        }
+                }
+                char *rv = malloc(strlen(str) + cntrl_chars + 1);
+                char *ptr = rv;
+                if (!rv)
+                        errExit("malloc");
+                c = str;
+                while (*c) {
+                        if (iscntrl(*c)) {
+                                *ptr++ = '\\';
+                                switch (*c) {
+                                        case '\b': *ptr++ = 'b'; break;
+                                        case '\a': *ptr++ = 'a'; break;
+                                        case '\e': *ptr++ = 'e'; break;
+                                        case '\f': *ptr++ = 'f'; break;
+                                        case '\n': *ptr++ = 'n'; break;
+                                        case '\r': *ptr++ = 'r'; break;
+                                        case '\t': *ptr++ = 't'; break;
+                                        case '\v': *ptr++ = 'v'; break;
+                                        case '\"': *ptr++ = '\"'; break;
+                                        case '\'': *ptr++ = '\''; break;
+                                        case '\?': *ptr++ = '?'; break;
+                                        case '\\': *ptr++ = '\\'; break;
+                                }
+                        } else {
+                                *ptr++ = *c;
+                        }
+                        c++;
+                }
+                *ptr = '\0';
+                return rv;
+        }
+        return NULL;
+}
+
 int has_cntrl_chars(const char *str) {
         assert(str);