Fix saveHistory() to not emit bogus complaint during psql exit when using

Darwin's libedit; per my proposal last August.  Also, suppress cast-away-
const warnings.

diff --git a/src/bin/psql/input.c b/src/bin/psql/input.c
index 266986a886d1315099b12cc33353693ace2bb4f2..cef02c3bf11909146143c8fb7b2bf35aef98713b 100644 (file)
--- a/src/bin/psql/input.c
+++ b/src/bin/psql/input.c
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2000-2006, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/bin/psql/input.c,v 1.55 2006/06/14 16:49:02 tgl Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/input.c,v 1.56 2006/06/18 17:30:48 tgl Exp $
  */
 #include "postgres_fe.h"
 
@@ -245,11 +245,14 @@ encode_history(void)
    HIST_ENTRY *cur_hist;
    char *cur_ptr;
 
-   for (history_set_pos(0), cur_hist = current_history();
-        cur_hist; cur_hist = next_history())
-       for (cur_ptr = cur_hist->line; *cur_ptr; cur_ptr++)
+   history_set_pos(0);
+   for (cur_hist = current_history(); cur_hist; cur_hist = next_history())
+   {
+       /* some platforms declare HIST_ENTRY.line as const char * */
+       for (cur_ptr = (char *) cur_hist->line; *cur_ptr; cur_ptr++)
            if (*cur_ptr == '\n')
                *cur_ptr = NL_IN_HISTORY;
+   }
 }
 
 /*
@@ -261,11 +264,14 @@ decode_history(void)
    HIST_ENTRY *cur_hist;
    char *cur_ptr;
 
-   for (history_set_pos(0), cur_hist = current_history();
-        cur_hist; cur_hist = next_history())
-       for (cur_ptr = cur_hist->line; *cur_ptr; cur_ptr++)
+   history_set_pos(0);
+   for (cur_hist = current_history(); cur_hist; cur_hist = next_history())
+   {
+       /* some platforms declare HIST_ENTRY.line as const char * */
+       for (cur_ptr = (char *) cur_hist->line; *cur_ptr; cur_ptr++)
            if (*cur_ptr == NL_IN_HISTORY)
                *cur_ptr = '\n';
+   }
 }
 #endif /* USE_READLINE */
 
@@ -339,13 +345,22 @@ saveHistory(char *fname, bool encodeFlag)
    {
        if (encodeFlag)
            encode_history();
-       if (write_history(fname) == 0)
+
+       /*
+        * return value of write_history is not standardized across GNU
+        * readline and libedit.  Therefore, check for errno becoming set
+        * to see if the write failed.
+        */
+       errno = 0;
+       (void) write_history(fname);
+       if (errno == 0)
            return true;
 
        psql_error("could not save history to file \"%s\": %s\n",
                   fname, strerror(errno));
    }
 #else
+   /* only get here in \s case, so complain */
    psql_error("history is not supported by this installation\n");
 #endif