add fmt_ldapescape2

textcode.h

@@ -34,6 +34,7 @@ size_t fmt_cescape2(char* dest,const char* src,size_t len,const char* escapeme);
 size_t fmt_foldwhitespace(char* dest,const char* src,size_t len);
 /* worst case: len*3 */
 size_t fmt_ldapescape(char* dest,const char* src,size_t len);
+size_t fmt_ldapescape2(char* dest,const char* src,size_t len,const char* escapeme);
 
 /* These read one line from src, decoded it, and write the result to
  * dest.  The number of decoded bytes is written to destlen.  dest

textcode/fmt_ldapescape2.c

@@ -0,0 +1,25 @@
+#include "fmt.h"
+#include "textcode.h"
+#include "haveinline.h"
+#include <string.h>
+
+size_t fmt_ldapescape2(char* dest,const char* src,size_t len,const char* escapeme) {
+  register const unsigned char* s=(const unsigned char*) src;
+  size_t written=0,i;
+  for (i=0; i<len; ++i) {
+    if (s[i]=='\\' || s[i]<' ' || strchr(escapeme,s[i])) {
+      if (dest) {
+	dest[written]='\\';
+	dest[written+1]=fmt_tohex(s[i]>>4);
+	dest[written+2]=fmt_tohex(s[i]&15);
+      }
+      written+=3;
+    } else {
+      if (dest) dest[written]=s[i]; ++written;
+    }
+    /* in case someone gives us malicious input */
+    if (written>((size_t)-1)/2) return (size_t)-1;
+  }
+  return written;
+}
+