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-rw-r--r--src/lookups/lf_quote.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/lookups/lf_quote.c b/src/lookups/lf_quote.c
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+++ b/src/lookups/lf_quote.c
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+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+#include "../exim.h"
+#include "lf_functions.h"
+
+
+/*************************************************
+* Add string to result, quoting if necessary *
+*************************************************/
+
+/* This function is called by some lookups that create name=value result
+strings, to handle the quoting of the data. It adds "name=" to the result,
+followed by appropriately quoted data, followed by a single space.
+
+Arguments:
+ name the field name
+ value the data value
+ vlength the data length
+ result the result expanding-string
+
+Returns: the result pointer (possibly updated)
+*/
+
+gstring *
+lf_quote(uschar *name, uschar *value, int vlength, gstring * result)
+{
+result = string_append(result, 2, name, US"=");
+
+/* NULL is handled as an empty string */
+
+if (!value)
+ {
+ value = US"";
+ vlength = 0;
+ }
+
+/* Quote the value if it is empty, contains white space, or starts with a quote
+character. */
+
+if (value[0] == 0 || Ustrpbrk(value, " \t\n\r") != NULL || value[0] == '\"')
+ {
+ result = string_catn(result, US"\"", 1);
+ for (int j = 0; j < vlength; j++)
+ {
+ if (value[j] == '\"' || value[j] == '\\')
+ result = string_catn(result, US"\\", 1);
+ result = string_catn(result, US value+j, 1);
+ }
+ result = string_catn(result, US"\"", 1);
+ }
+else
+ result = string_catn(result, US value, vlength);
+
+return string_catn(result, US" ", 1);
+}
+
+/* End of lf_quote.c */