Break out the unquote functionality to a separate function.

[mmh] / sbr / unquote.c

diff --git a/sbr/unquote.c b/sbr/unquote.c
new file mode 100644 (file)
index 0000000..f9fa911
--- /dev/null
+++ b/sbr/unquote.c
@@ -0,0 +1,45 @@
+/*
+ * unquote.c: Handle quote removal and quoted-pair strings on
+ * RFC 2822-5322 atoms.
+ *
+ * This code is Copyright (c) 2013, by the authors of nmh.  See the
+ * COPYRIGHT file in the root directory of the nmh distribution for
+ * complete copyright information.
+ */
+
+#include <h/mh.h>
+
+/*
+ * Remove quotes (and handle escape strings) from RFC 5322 quoted-strings.
+ *
+ * Since we never add characters to the string, the output buffer is assumed
+ * to have at least as many characters as the input string.
+ *
+ */
+
+void
+unquote_string(const char *input, char *output)
+{
+    int n = 0; /* n is the position in the input buffer */
+    int m = 0; /* m is the position in the output buffer */
+
+    while ( input[n] != '\0') {
+       switch ( input[n] ) {
+       case '\\':
+           n++;
+           if ( input[n] != '\0')
+               output[m++] = input[n++];
+           break;
+       case '"':
+           n++;
+           break;
+       default:
+           output[m++] = input[n++];
+           break;
+       }
+    }
+
+    output[m] = '\0';
+
+    return;
+}