change flag -xs to -i, -xm to -m, dependencies

lang/cem/cpp.ansi/Makefile

@@ -208,7 +208,9 @@ input.o: input.h
 input.o: inputtype.h
 main.o: arith.h
 main.o: file_info.h
+main.o: idf.h
 main.o: idfsize.h
+main.o: macro.h
 options.o: class.h
 options.o: idf.h
 options.o: idfsize.h

lang/cem/cpp.ansi/domacro.c

@@ -35,6 +35,7 @@ char ifstack[IFDEPTH];	/* if-stack: the content of an entry is	*/
 int	nestlevel = -1;
 int	svnestlevel[30] = {-1};
 int	nestcount;
+extern int do_preprocess;
 
 char *
 GetIdentifier(skiponerr)
@@ -301,10 +302,12 @@ do_include()
 	inctable[0] = WorkingDir;
 	if (filenm) {
 		if (!InsertFile(filenm, &inctable[tok==FILESPECIFIER],&result)){
-			error("cannot open include file \"%s\"", filenm);
+			if (do_preprocess) error("cannot open include file \"%s\"", filenm);
+			else warning("cannot open include file \"%s\"", filenm);
+			add_dependency(filenm);
 		}
 		else {
-			if (filenm != result) free(filenm);
+			add_dependency(result);
 			WorkingDir = getwdir(result);
 			svnestlevel[++nestcount] = nestlevel;
 			FileName = result;

lang/cem/cpp.ansi/idf.h

@@ -4,13 +4,17 @@
  */
 /* $Header$ */
 struct id_usr {
+	union {
 		struct macro *idu_macro;
+		struct idf *idu_file;
+	} idu_x;
 	int idu_resmac;
 };
 
 #define IDF_TYPE struct id_usr
 #define IDF_HSIZE 6
-#define id_macro id_user.idu_macro
+#define id_macro id_user.idu_x.idu_macro
+#define id_file id_user.idu_x.idu_file
 #define id_resmac id_user.idu_resmac
 
 #include <idf_pkg.spec>

lang/cem/cpp.ansi/macro.str

@@ -44,3 +44,4 @@ struct macro	{
 #define	K_LINE		10
 #define	K_PRAGMA	11
 #define	K_UNDEF		12
+#define K_FILE		100	/* for dependency generator */

lang/cem/cpp.ansi/main.c

@@ -6,15 +6,22 @@
 /* MAIN PROGRAM */
 
 #include	<alloc.h>
+#include	<assert.h>
 #include	<system.h>
 #include 	"arith.h"
 #include	"file_info.h"
 #include	"idfsize.h"
+#include	"idf.h"
+#include	"macro.h"
 
 extern char *symbol2str();
 extern char *getwdir();
 extern int err_occurred;
+extern int do_dependencies;
+extern char *dep_file;
 int idfsize = IDFSIZE;
+extern char options[];
+static File *dep_fd = STDOUT;
 
 arith ifval;
 
@@ -81,6 +88,66 @@ compile(argc, argv)
 			source ? source : "stdin");
 	if (source) WorkingDir = getwdir(dummy);
 	preprocess(source);
+	if (do_dependencies) list_dependencies(source);
+}
+
+struct idf	*file_head;
+extern char *strrindex();
+
+list_dependencies(source)
+	char *source;
+{
+	register struct idf *p = file_head;
+
+	if (source) {
+		register char *s = strrindex(source, '.');
+
+		if (s && *(s+1)) {
+			s++;
+			*s++ = 'o';
+			*s = '\0';
+                        /* the source may be in another directory than the
+                         * object generated, so don't include the pathname
+                         * leading to it.
+                         */
+                        if (s = strrindex(source, '/')) {
+                                source = s + 1;
+                        }
+		}
+		else source = 0; 
+	}
+	if (dep_file && !sys_open(dep_file, OP_WRITE, &dep_fd)) {
+		fatal("could not open %s", dep_file);
+	}
+	while (p) {
+		assert(p->id_resmac == K_FILE);
+		dependency(p->id_text, source);
+		p = p->id_file;
+	}
+}
+
+add_dependency(s)
+	char *s;
+{
+	register struct idf *p = str2idf(s, 0);
+
+	if (! p->id_resmac) {
+		p->id_resmac = K_FILE;
+		p->id_file = file_head;
+		file_head = p;
+	}
+}
+
+dependency(s, source)
+	char *s, *source;
+{
+	if (options['i'] && !strncmp(s, "/usr/include/", 13)) {
+		return;
+	}
+	if (options['m'] && source) {
+		fprint(dep_fd, "%s: %s\n", source, s);
+	}
+	else	fprint(dep_fd, "%s\n", s);
 }
 
 No_Mem()				/* called by alloc package */

lang/cem/cpp.ansi/ncpp.6

@@ -42,6 +42,28 @@ do not generate line directives
 .IP -\fBM\fIn\fR
 set maximum identifier length to
 .IR n .
+.IP -\fBd\fR[\fIfile\fR]
+.br
+if \fIfile\fR is not given, do not preprocess, but instead generate a list
+of makefile dependencies and write them to the standard output.
+If \fIfile\fP is given, generate preprocessor output on standard output,
+and generate the list of makefile dependencies on file \fIfile\fP.
+.IP -\fBA\fR[\fIfile\fR]
+identical to the -d option.
+.IP -\fBi\fR
+when generating makefile dependencies, do not include files from
+/usr/include.
+.IP -\fBm\fR
+when generating makefile dependencies, generate them in the following format:
+.RS
+.IP "file.o: file1.h"
+.RE
+.IP ""
+where "file.o" is derived from the source file name. Normally, only a list
+of files included is generated.
+.IP -\fBundef\fR
+.br
+this flag is silently ignored, for compatibility with other preprocessors.
 .PP
 The following names are always available. They cannot be the subject of a
 -U command line option or a #undef directive.

lang/cem/cpp.ansi/options.c

@@ -15,8 +15,10 @@ char	options[128];			/* one for every char	*/
 int	inc_pos = 1;			/* place where next -I goes */
 int	inc_max;
 int	inc_total;
-int	debug;
+int	do_preprocess = 1;
+int	do_dependencies = 0;
 char	**inctable;
+char	*dep_file = 0;
 
 extern int idfsize;
 int	txt2int();
@@ -28,14 +30,30 @@ do_option(text)
 	case '-':
 		options[*text] = 1;
 		break;
+	case 'u':
+		if (! strcmp(text, "ndef")) {
+			/* ignore -undef */
+			break;
+		}
+		/* fall through */
 	default:
 		error("illegal option: %c", text[-1]);
 		break;
-	case 'o':	/* ignore garbage after #else or #endif */
+	case 'A' :	/* for Amake */
-		options['o'] = 1;
+	case 'd' :	/* dependency generation */
+		do_dependencies = 1;
+		if (*text) {
+			dep_file = text;
+		}
+		else {
+			do_preprocess = 0;
+		}
 		break;
+	case 'i':
+	case 'm':
+	case 'o':	/* ignore garbage after #else or #endif */
 	case 'C' :	/* comment output		*/
-		options['C'] = 1;
+		options[*(text-1)] = 1;
 		break;
 	case 'D' :	/* -Dname :	predefine name		*/
 	{