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+/*
+ * 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;
+}