Remove some unreachable character types in the CONF parser

DQUOTE and FCOMMENT are remnants of a second parser in OpenSSL. OpenSSL
has CONF_type_default, which is the one we imported, and CONF_type_win32
which is a different syntax which looks to be modeled after Windows ini
files. DQUOTE and FCOMMENT only exist in this one.

Change-Id: Iffa01fcb012b0f3e7f8dbf87a01ba867bdc7bcc7
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/60087
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

crypto/conf/conf.c

diff --git a/crypto/conf/conf.c b/crypto/conf/conf.c
index 3e95e8b..14caa70 100644
--- a/crypto/conf/conf.c
+++ b/crypto/conf/conf.c
@@ -228,22 +228,6 @@
       if (*from == q) {
         from++;
       }
-    } else if (IS_DQUOTE(conf, *from)) {
-      q = *from;
-      from++;
-      while (!IS_EOF(conf, *from)) {
-        if (*from == q) {
-          if (*(from + 1) == q) {
-            from++;
-          } else {
-            break;
-          }
-        }
-        buf->data[to++] = *(from++);
-      }
-      if (*from == q) {
-        from++;
-      }
     } else if (IS_ESC(conf, *from)) {
       from++;
       v = *(from++);
@@ -454,33 +438,8 @@
   return p;
 }
 
-
-static char *scan_dquote(CONF *conf, char *p) {
-  int q = *p;
-
-  p++;
-  while (!(IS_EOF(conf, *p))) {
-    if (*p == q) {
-      if (*(p + 1) == q) {
-        p++;
-      } else {
-        break;
-      }
-    }
-    p++;
-  }
-  if (*p == q) {
-    p++;
-  }
-  return p;
-}
-
 static void clear_comments(CONF *conf, char *p) {
   for (;;) {
-    if (IS_FCOMMENT(conf, *p)) {
-      *p = '\0';
-      return;
-    }
     if (!IS_WS(conf, *p)) {
       break;
     }
@@ -492,10 +451,6 @@
       *p = '\0';
       return;
     }
-    if (IS_DQUOTE(conf, *p)) {
-      p = scan_dquote(conf, p);
-      continue;
-    }
     if (IS_QUOTE(conf, *p)) {
       p = scan_quote(conf, p);
       continue;

crypto/conf/conf_def.h

diff --git a/crypto/conf/conf_def.h b/crypto/conf/conf_def.h
index f01a79b..d2c285a 100644
--- a/crypto/conf/conf_def.h
+++ b/crypto/conf/conf_def.h
@@ -55,8 +55,9 @@
  * [including the GNU Public Licence.]
  */
 
-/* THIS FILE WAS AUTOMAGICALLY GENERATED!
-   Please modify and use keysets.pl to regenerate it. */
+// This file was historically generated by keysets.pl in OpenSSL.
+//
+// TODO(davidben): Replace it with something more readable.
 
 #define CONF_NUMBER		1
 #define CONF_UPPER		2
@@ -66,9 +67,7 @@
 #define CONF_WS			16
 #define CONF_ESC		32
 #define CONF_QUOTE		64
-#define CONF_DQUOTE		1024
 #define CONF_COMMENT		128
-#define CONF_FCOMMENT		2048
 #define CONF_EOF		8
 #define CONF_HIGHBIT		4096
 #define CONF_ALPHA		(CONF_UPPER|CONF_LOWER)
@@ -78,7 +77,6 @@
 
 #define KEYTYPES(c)		CONF_type_default
 #define IS_COMMENT(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_COMMENT)
-#define IS_FCOMMENT(c,a)	(KEYTYPES(c)[(a)&0xff]&CONF_FCOMMENT)
 #define IS_EOF(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_EOF)
 #define IS_ESC(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_ESC)
 #define IS_NUMBER(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_NUMBER)
@@ -87,8 +85,6 @@
 #define IS_ALPHA_NUMERIC_PUNCT(c,a) \
 				(KEYTYPES(c)[(a)&0xff]&CONF_ALPHA_NUMERIC_PUNCT)
 #define IS_QUOTE(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_QUOTE)
-#define IS_DQUOTE(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_DQUOTE)
-#define IS_HIGHBIT(c,a)		(KEYTYPES(c)[(a)&0xff]&CONF_HIGHBIT)
 
 static const unsigned short CONF_type_default[256]={
 	0x0008,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,