Drop all non-namespaced symbols

1. All data types and macros in headers, global variables and functions
   that have external linkage are namespaced. The only two files that
   allow non-namespaced symbols are main.c and common.h. common.h should
   not be included by any other headers.
2. Coding style is fixed when possible.
3. Drop unused variables or struct members.
4. 'name' macro is renamed to 'prog_name' to prevent conflicts with ast.h.
5. %union includes a CON_Type (now CcmmcValueConst) instead of a pointer
   to it. This prevents an unnecessary malloc.
6. Fix buffer overflow in draw.c. draw.c should not modify the input AST
   while generating the graph.

1 files changed, 8 insertions, 19 deletions

diff --git a/src/lexer.l b/src/lexer.l
index 92aa645..168412b 100644
--- a/src/lexer.l
+++ b/src/lexer.l
@@ -93,31 +93,20 @@ ERROR           .
                     return ID;
                 }
 {CONST_INT}     {
-                    CON_Type *p;
-                    p = malloc(sizeof(CON_Type));
-                    ERR_FATAL_CHECK(p, malloc);
-                    p->const_type = INTEGERC;
-                    p->const_u.intval = atoi(yytext);
-                    yylval->const1 = p;
+                    yylval->value_const.kind = CCMMC_KIND_CONST_INT;
+                    yylval->value_const.const_int = atoi(yytext);
                     return CONST;
                 }
 {CONST_FLOAT}   {
-                    CON_Type *p;
-                    p = malloc(sizeof(CON_Type));
-                    ERR_FATAL_CHECK(p, malloc);
-                    p->const_type = FLOATC;
-                    p->const_u.fval = atof(yytext);
-                    yylval->const1 = p;
+                    yylval->value_const.kind = CCMMC_KIND_CONST_FLOAT;
+                    yylval->value_const.const_float = atof(yytext);
                     return CONST;
                 }
 {CONST_STRING}  {
-                    CON_Type *p;
-                    p = malloc(sizeof(CON_Type));
-                    ERR_FATAL_CHECK(p, malloc);
-                    p->const_type = STRINGC;
-                    p->const_u.sc = strdup(yytext);
-                    ERR_FATAL_CHECK(p->const_u.sc, strdup);
-                    yylval->const1 = p;
+                    size_t len = strlen(yytext);
+                    yylval->value_const.kind = CCMMC_KIND_CONST_STRING;
+                    yylval->value_const.const_string = strndup(yytext + 1, len - 2);
+                    ERR_FATAL_CHECK(yylval->value_const.const_string, strdup);
                     return CONST;
                 }
 {COMMENT}       {