libedit: add H_SAVE_FP which saves history to a file pointer.

H_SAVE_FP is similar to H_SAVE but operates on a FILE* instead of a filename.
This is useful when operating in capability mode.

Reviewed by:	christos@NetBSD.org, pfg

lib/libedit/editline.3

@@ -682,6 +682,9 @@ Load the history list stored in
 .It Dv H_SAVE , Fa "const char *file"
 Save the history list to
 .Fa file .
+.It Dv H_SAVE_FP , Fa "FILE*"
+Save the history list to the opened
+.Fa FILE* .
 .It Dv H_SETUNIQUE , Fa "int unique"
 Set flag that adjacent identical event strings should not be entered
 into the history.

lib/libedit/hist.h

@@ -65,6 +65,7 @@ typedef struct el_history_t {
 #define	HIST_SET(el, num)	HIST_FUN(el, H_SET, num)
 #define	HIST_LOAD(el, fname)	HIST_FUN(el, H_LOAD fname)
 #define	HIST_SAVE(el, fname)	HIST_FUN(el, H_SAVE fname)
+#define	HIST_SAVE_FP(el, fp)	HIST_FUN(el, H_SAVE_FP fp)
 
 protected int		hist_init(EditLine *);
 protected void		hist_end(EditLine *);

lib/libedit/histedit.h

@@ -208,6 +208,7 @@ int		history(History *, HistEvent *, int, ...);
 #define	H_NEXT_EVDATA	23	/* , const int, histdata_t *);	*/
 #define	H_DELDATA	24	/* , int, histdata_t *);*/
 #define	H_REPLACE	25	/* , const char *, histdata_t);	*/
+#define	H_SAVE_FP	26	/* , FILE*);	*/
 
 
 /*

lib/libedit/history.c

@@ -103,6 +103,7 @@ private int history_getunique(History *, HistEvent *);
 private int history_set_fun(History *, History *);
 private int history_load(History *, const char *);
 private int history_save(History *, const char *);
+private int history_save_fp(History *, FILE*);
 private int history_prev_event(History *, HistEvent *, int);
 private int history_next_event(History *, HistEvent *, int);
 private int history_next_string(History *, HistEvent *, const char *);
@@ -773,22 +774,16 @@ history_load(History *h, const char *fname)
 	return (i);
 }
 
-
+/* history_save_fp():
-/* history_save():
+ *	History save with open FILE*
- *	History save function
  */
-private int
+private int history_save_fp(History *h, FILE* fp)
-history_save(History *h, const char *fname)
 {
-	FILE *fp;
 	HistEvent ev;
 	int i = -1, retval;
 	size_t len, max_size;
 	char *ptr;
 
-	if ((fp = fopen(fname, "w")) == NULL)
-		return (-1);
-
 	if (fchmod(fileno(fp), S_IRUSR|S_IWUSR) == -1)
 		goto done;
 	if (fputs(hist_cookie, fp) == EOF)
@@ -815,6 +810,26 @@ history_save(History *h, const char *fname)
 	}
 oomem:
 	h_free((ptr_t)ptr);
+done:
+	return (i);
+	
+}
+
+
+/* history_save():
+ *	History save function
+ */
+private int
+history_save(History *h, const char *fname)
+{
+	FILE *fp;
+	int i;
+
+	if ((fp = fopen(fname, "w")) == NULL)
+		return (-1);
+
+	i = history_save_fp(h, fp);
+
 done:
 	(void) fclose(fp);
 	return (i);
@@ -1001,6 +1016,12 @@ history(History *h, HistEvent *ev, int fun, ...)
 			he_seterrev(ev, _HE_HIST_WRITE);
 		break;
 
+	case H_SAVE_FP:
+		retval = history_save_fp(h, va_arg(va, FILE*));
+		if (retval == -1)
+			he_seterrev(ev, _HE_HIST_WRITE);
+		break;
+
 	case H_PREV_EVENT:
 		retval = history_prev_event(h, ev, va_arg(va, int));
 		break;