Merge pull request #2671 from Helianthella/binliteral

add support for binary and octal number literals

1 files changed, 53 insertions, 5 deletions

diff --git a/3rdparty/libconfig/libconfig.c b/3rdparty/libconfig/libconfig.c
index 533145ac4..daf3ba42d 100644
--- a/3rdparty/libconfig/libconfig.c
+++ b/3rdparty/libconfig/libconfig.c
@@ -174,6 +174,31 @@ static void __config_indent(FILE *stream, int depth, unsigned short w)
 
 /* ------------------------------------------------------------------------- */
 
+/**
+ * converts an integer to a binary string (because itoa is not in C99)
+ * skips leading zeros, and does not prepend with a 0b prefix
+ *
+ * @param value - the integer to convert to a binary expression
+ * @param buffer - a pointer to the buffer used to build the string
+ * @returns the same buffer
+ */
+char *int_tobin(const unsigned long long value, char *buffer) {
+  const unsigned long long mask = 1;
+  unsigned char nonzero = 0;
+
+  for (char bit = 63; bit >= 0; --bit) {
+    if ((value & (mask << bit)) == 1) {
+      nonzero = 1;
+      *buffer++ = '1';
+    } else if (nonzero != 0) {
+      *buffer++ = '0';
+    }
+  }
+
+  *buffer = '\0';
+  return buffer;
+}
+
 static void __config_write_value(const struct config_t *config,
                                  const union config_value_t *value, int type,
                                  int format, int depth, FILE *stream)
@@ -195,6 +220,17 @@ static void __config_write_value(const struct config_t *config,
           fprintf(stream, "0x%X", (unsigned int)(value->ival));
           break;
 
+        case CONFIG_FORMAT_BIN:
+        {
+          char buffer[33]; // 32 individual bits (char '0' and '1') represented as 32 bytes + null
+          fprintf(stream, "0b%s", int_tobin((unsigned int)(value->ival), buffer));
+          break;
+        }
+
+        case CONFIG_FORMAT_OCT:
+          fprintf(stream, "0o%o", (unsigned int)(value->ival));
+          break;
+
         case CONFIG_FORMAT_DEFAULT:
         default:
           fprintf(stream, "%d", value->ival);
@@ -210,6 +246,17 @@ static void __config_write_value(const struct config_t *config,
           fprintf(stream, "0x" INT64_HEX_FMT "L", (unsigned long long)(value->llval));
           break;
 
+        case CONFIG_FORMAT_BIN:
+        {
+          char buffer[65]; // 64 individual bits (char '0' and '1') represented as 64 bytes + null
+          fprintf(stream, "0b%s", int_tobin((unsigned long long)(value->llval), buffer));
+          break;
+        }
+
+        case CONFIG_FORMAT_OCT:
+          fprintf(stream, "0o" INT64_OCT_FMT "L", (unsigned long long)(value->llval));
+          break;
+
         case CONFIG_FORMAT_DEFAULT:
         default:
           fprintf(stream, INT64_FMT "L", value->llval);
@@ -1174,14 +1221,15 @@ int config_setting_set_string(struct config_setting_t *setting, const char *valu
 
 int config_setting_set_format(struct config_setting_t *setting, short format)
 {
-  if(((setting->type != CONFIG_TYPE_INT)
-      && (setting->type != CONFIG_TYPE_INT64))
-     || ((format != CONFIG_FORMAT_DEFAULT) && (format != CONFIG_FORMAT_HEX)))
-    return(CONFIG_FALSE);
+  if (((setting->type != CONFIG_TYPE_INT) && (setting->type != CONFIG_TYPE_INT64))
+      || ((format != CONFIG_FORMAT_DEFAULT) && (format != CONFIG_FORMAT_HEX)
+           && (format != CONFIG_FORMAT_BIN) && (format != CONFIG_FORMAT_OCT))) {
+    return CONFIG_FALSE;
+  }
 
   setting->format = format;
 
-  return(CONFIG_TRUE);
+  return CONFIG_TRUE;
 }
 
 /* ------------------------------------------------------------------------- */