use constant strings for pathnames.

bind.c

@@ -474,7 +474,7 @@ int startup(char *sfname)
  * char *fname;		base file name to search for
  * int hflag;		Look in the HOME environment variable first?
  */
-char *flook(char *fname, int hflag)
+char *flook( const char *fname, int hflag)
 {
 	char *home;	/* path to home directory */
 	char *path;	/* environmental PATH variable */
@@ -502,9 +502,10 @@ char *flook(char *fname, int hflag)
 #endif
 
 	/* always try the current directory first */
-	if (ffropen(fname) == FIOSUC) {
-		ffclose();
-		return fname;
+	strcpy( fspec, fname) ;
+	if( ffropen( fspec) == FIOSUC) {
+		ffclose() ;
+		return fspec ;
 	}
 #if	ENVFUNC
 	/* get the PATH variable */

efunc.h

@@ -180,7 +180,7 @@ extern int buildlist(int type, char *mstring);
 extern int strinc(char *source, char *sub);
 extern unsigned int getckey(int mflag);
 extern int startup(char *sfname);
-extern char *flook(char *fname, int hflag);
+char *flook( const char *fname, int hflag) ;
 extern void cmdstr(int c, char *seq);
 extern fn_t getbind(int c);
 extern char *getfname(fn_t);
@@ -221,7 +221,7 @@ extern int filename(int f, int n);
 extern int ifile(char *fname);
 
 /* fileio.c */
-extern int ffropen(char *fn);
+int ffropen( const char *fn) ;
 extern int ffwopen(char *fn);
 extern int ffclose(void);
 extern int ffputline(char *buf, int nbuf);

epath.h

@@ -9,7 +9,7 @@
 #define EPATH_H_
 
 /*	possible names and paths of help files under different OSs	*/
-static char *pathname[] =
+static const char *pathname[] =
 #if	MSDOS
 {
 	"emacs.rc",

fileio.c

@@ -17,7 +17,7 @@ static int eofflag;			/* end-of-file flag */
 /*
  * Open a file for reading.
  */
-int ffropen(char *fn)
+int ffropen( const char *fn)
 {
 	if ((ffp = fopen(fn, "r")) == NULL)
 		return FIOFNF;

spawn.c

@@ -1,4 +1,4 @@
-/*	spaw.c
+/*	spawn.c
  *
  *	Various operating system access commands.
  *
@@ -571,7 +571,7 @@ int execprog(char *cmd)
 		char *fcb1;	/* 4 byte pointer to FCB at PSP+5Ch */
 		char *fcb2;	/* 4 byte pointer to FCB at PSP+6Ch */
 	} pblock;
-	char *flook();
+	char *flook( const char *fname, int hflag) ;
 
 	/* parse the command name from the command line */
 	sp = prog;