Bytestring: implement bytestring literals and constants

Implement byte string literals on the format b"xxx" and b64"xxx"
which can be used as literals and in constants.

The format b"xxx" supports character data and octal and
hexadecimal data using C escapes (\n, \nn, \nnn, \xn and \xnn).

The format b64"xxx" supports base64 encoded strings (RFC1341).

1 files changed, 58 insertions, 1 deletions

diff --git a/conf/cf-lex.l b/conf/cf-lex.l
index e789e864..5556697d 100644
--- a/conf/cf-lex.l
+++ b/conf/cf-lex.l
@@ -50,6 +50,7 @@
 #include "conf/cf-parse.tab.h"
 #include "lib/string.h"
 #include "lib/hash.h"
+#include "lib/base64.h"
 
 struct keyword {
   byte *name;
@@ -124,10 +125,11 @@ static enum yytokentype cf_lex_symbol(const char *data);
 %option nounput
 %option noreject
 
-%x COMMENT CCOMM CLI QUOTED APOSTROPHED INCLUDE
+%x COMMENT CCOMM CLI QUOTED BQUOTED B64QUOTED APOSTROPHED INCLUDE
 
 ALPHA [a-zA-Z_]
 DIGIT [0-9]
+OIGIT [0-7]
 XIGIT [0-9a-fA-F]
 ALNUM [a-zA-Z_0-9]
 WHITE [ \t]
@@ -356,6 +358,61 @@ else: {
 
 <QUOTED>.	BUFFER_PUSH(quoted_buffer) = yytext[0];
 
+[b]["] {
+  BEGIN(BQUOTED);
+  quoted_buffer_init();
+}
+
+<BQUOTED>\n	cf_error("Unterminated byte string");
+<BQUOTED><<EOF>> cf_error("Unterminated byte string");
+<BQUOTED>["]	{
+  BEGIN(INITIAL);
+  struct bytestring *bytes;
+
+  bytes = cfg_allocz(sizeof(*bytes) + quoted_buffer.used);
+  memcpy(bytes->data, quoted_buffer.data, quoted_buffer.used);
+  bytes->length = quoted_buffer.used;
+
+  cf_lval.bs = bytes;
+  return BYTETEXT;
+}
+
+<BQUOTED>.	BUFFER_PUSH(quoted_buffer) = yytext[0];
+
+<BQUOTED>[\\]({OIGIT}|{OIGIT}{OIGIT}|{OIGIT}{OIGIT}{OIGIT})	{
+  char buf[4];
+  char *end = NULL;
+  memcpy(buf, yytext + 1, yyleng);
+  buf[yyleng] = 0;
+  BUFFER_PUSH(quoted_buffer) = bstrtoul10(buf, &end);
+}
+
+<BQUOTED>[\\][x]({XIGIT}|{XIGIT}{XIGIT})	{
+  char buf[3];
+  char *end = NULL;
+  memcpy(buf, yytext + 2, yyleng);
+  buf[yyleng] = 0;
+  BUFFER_PUSH(quoted_buffer) = bstrtoul16(buf, &end);
+}
+
+[b][6][4]["] {
+  BEGIN(B64QUOTED);
+  quoted_buffer_init();
+}
+
+<B64QUOTED>\n	cf_error("Unterminated base64 string");
+<B64QUOTED><<EOF>> cf_error("Unterminated base64 string");
+<B64QUOTED>["]	{
+  BEGIN(INITIAL);
+  cf_lval.bs = base64_decode_bs(cfg_mem, quoted_buffer.data, quoted_buffer.used, NULL);
+  if (!cf_lval.bs)
+    cf_error("Invalid base64 string");
+
+  return BYTETEXT;
+}
+
+<B64QUOTED>.	BUFFER_PUSH(quoted_buffer) = yytext[0];
+
 <INITIAL,COMMENT><<EOF>>	{ if (check_eof()) return END; }
 
 {WHITE}+