1 files changed, 137 insertions, 0 deletions
diff --git a/hdrmacro.c b/hdrmacro.c
new file mode 100644
index 0000000..43031d4
--- /dev/null
+++ b/hdrmacro.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright 1993, 2000 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*  This file is ALSO:
+ *  Copyright 2001-2004 David Abrahams.
+ *  Distributed under the Boost Software License, Version 1.0.
+ *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+# include "jam.h"
+# include "lists.h"
+# include "parse.h"
+# include "compile.h"
+# include "rules.h"
+# include "variable.h"
+# include "regexp.h"
+# include "hdrmacro.h"
+# include "hash.h"
+# include "newstr.h"
+# include "strings.h"
+
+/*
+ * hdrmacro.c - handle header files that define macros used in
+ *              #include statements.
+ *
+ *  we look for lines like "#define MACRO  <....>" or '#define MACRO  "    "'
+ *  in the target file. When found, we
+ *
+ *  we then phony up a rule invocation like:
+ *
+ *  $(HDRRULE) <target> : <resolved included files> ;
+ *
+ * External routines:
+ *    headers1() - scan a target for "#include MACRO" lines and try
+ *                 to resolve them when needed
+ *
+ * Internal routines:
+ *    headers1() - using regexp, scan a file and build include LIST
+ *
+ * 04/13/94 (seiwald) - added shorthand L0 for null list pointer
+ * 09/10/00 (seiwald) - replaced call to compile_rule with evaluate_rule,
+ *      so that headers() doesn't have to mock up a parse structure
+ *      just to invoke a rule.
+ */
+
+/* this type is used to store a dictionary of file header macros */
+typedef struct header_macro
+{
+  char * symbol;
+  char * filename;  /* we could maybe use a LIST here ?? */
+} HEADER_MACRO;
+
+static struct hash * header_macros_hash = 0;
+
+
+/*
+ * headers() - scan a target for include files and call HDRRULE
+ */
+
+# define MAXINC 10
+
+void
+macro_headers( TARGET *t )
+{
+    static regexp *re = 0;
+    FILE    *f;
+    char    buf[ 1024 ];
+
+    if ( DEBUG_HEADER )
+        printf( "macro header scan for %s\n", t->name );
+
+    /* this regexp is used to detect lines of the form       */
+    /* "#define  MACRO  <....>" or "#define  MACRO  "....."  */
+    /* in the header macro files..                           */
+    if ( re == 0 )
+    {
+        re = regex_compile(
+            "^[     ]*#[    ]*define[   ]*([A-Za-z][A-Za-z0-9_]*)[  ]*"
+            "[<\"]([^\">]*)[\">].*$" );
+    }
+
+    if ( !( f = fopen( t->boundname, "r" ) ) )
+        return;
+
+    while ( fgets( buf, sizeof( buf ), f ) )
+    {
+        HEADER_MACRO var;
+        HEADER_MACRO *v = &var;
+
+        if ( regexec( re, buf ) && re->startp[1] )
+        {
+            /* we detected a line that looks like "#define  MACRO  filename */
+            re->endp[1][0] = '\0';
+            re->endp[2][0] = '\0';
+
+            if ( DEBUG_HEADER )
+                printf( "macro '%s' used to define filename '%s' in '%s'\n",
+                        re->startp[1], re->startp[2], t->boundname );
+
+            /* add macro definition to hash table */
+            if ( !header_macros_hash )
+                header_macros_hash = hashinit( sizeof( HEADER_MACRO ), "hdrmacros" );
+
+            v->symbol   = re->startp[1];
+            v->filename = 0;
+            if ( hashenter( header_macros_hash, (HASHDATA **)&v ) )
+            {
+                v->symbol   = newstr( re->startp[1] );  /* never freed */
+                v->filename = newstr( re->startp[2] );  /* never freed */
+            }
+            /* XXXX: FOR NOW, WE IGNORE MULTIPLE MACRO DEFINITIONS !! */
+            /*       WE MIGHT AS WELL USE A LIST TO STORE THEM..      */
+        }
+    }
+
+    fclose( f );
+}
+
+
+char * macro_header_get( const char * macro_name )
+{
+    HEADER_MACRO var;
+    HEADER_MACRO * v = &var;
+
+    v->symbol = (char* )macro_name;
+
+    if ( header_macros_hash && hashcheck( header_macros_hash, (HASHDATA **)&v ) )
+    {
+        if ( DEBUG_HEADER )
+            printf( "### macro '%s' evaluated to '%s'\n", macro_name, v->filename );
+        return v->filename;
+    }
+    return 0;
+}