1 files changed, 51 insertions, 0 deletions
diff --git a/lib/util/util_str_common.c b/lib/util/util_str_common.c
index e6671be8ad..fe78d65020 100644
--- a/lib/util/util_str_common.c
+++ b/lib/util/util_str_common.c
@@ -102,3 +102,54 @@ void string_replace( char *s, char oldc, char newc )
 		p += c_size;
 	}
 }
+
+
+/**
+ Paranoid strcpy into a buffer of given length (includes terminating
+ zero. Strips out all but 'a-Z0-9' and the character in other_safe_chars
+ and replaces with '_'. Deliberately does *NOT* check for multibyte
+ characters. Treats src as an array of bytes, not as a multibyte
+ string. Any byte >0x7f is automatically converted to '_'.
+ other_safe_chars must also contain an ascii string (bytes<0x7f).
+**/
+
+char *alpha_strcpy(char *dest,
+		   const char *src,
+		   const char *other_safe_chars,
+		   size_t maxlength)
+{
+	size_t len, i;
+
+	if (!dest) {
+		smb_panic("ERROR: NULL dest in alpha_strcpy");
+	}
+
+	if (!src) {
+		*dest = 0;
+		return dest;
+	}
+
+	len = strlen(src);
+	if (len >= maxlength)
+		len = maxlength - 1;
+
+	if (!other_safe_chars)
+		other_safe_chars = "";
+
+	for(i = 0; i < len; i++) {
+		int val = (src[i] & 0xff);
+		if (val > 0x7f) {
+			dest[i] = '_';
+			continue;
+		}
+		if (isupper(val) || islower(val) ||
+				isdigit(val) || strchr(other_safe_chars, val))
+			dest[i] = src[i];
+		else
+			dest[i] = '_';
+	}
+
+	dest[i] = '\0';
+
+	return dest;
+}