Forced first linedirective with source filename

diff --git a/util/cpp/preprocess.c b/util/cpp/preprocess.c
index 884684e..d33d17a 100644 (file)
--- a/util/cpp/preprocess.c
+++ b/util/cpp/preprocess.c
@@ -28,13 +28,27 @@ preprocess(fn)
        register int c;
        register char *op = _obuf;
        register char *ob = &_obuf[OBUFSIZE];
-       int lineno = 32767;     /* force line directive */
+       char Xbuf[256];
+       int lineno = 0;
        extern char options[];
 
 #define flush(X)       (sys_write(STDOUT,_obuf,X))
 #define echo(ch)       if (op == ob) { Xflush(); op = _obuf; } *op++ = (ch);
 #define newline()      echo('\n')
 
+       if (! options['P']) {
+               /* Generate a line directive communicating the
+                  source filename
+               */
+               register char *p = Xbuf;
+
+               sprint(p, "%s 1 \"%s\"\n",
+                       LINE_PREFIX,
+                       FileName);
+               while (*p) {
+                       echo(*p++);
+               }
+       }
        for (;;) {
                LineNumber++;
                lineno++;
@@ -49,7 +63,6 @@ preprocess(fn)
                        fn = FileName;
                        lineno = LineNumber;
                        if (! options['P']) {
-                               char Xbuf[256];
                                register char *p = Xbuf;
 
                                sprint(p, "%s %d \"%s\"\n",