From 6badd98747316cb0d82195e8022e30ece202be1d Mon Sep 17 00:00:00 2001
From: Robert Kessl <kesslr@centrum.cz>
Date: Mon, 21 Jul 2014 09:23:16 +0200
Subject: [PATCH] tableprinter: formatters are now const

---
 ucw/table-test.c |  9 ++++++++-
 ucw/table.c      |  8 ++++----
 ucw/table.h      | 14 +++++++-------
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/ucw/table-test.c b/ucw/table-test.c
index c41dbf28..f23c176d 100644
--- a/ucw/table-test.c
+++ b/ucw/table-test.c
@@ -143,7 +143,12 @@ static bool user_defined_option(struct table *tbl UNUSED, const char *key, const
 
 static void test_option_parser(struct table *tbl)
 {
-  tbl->formatter->process_option = user_defined_option;
+  struct table_formatter test_option_fmtr = table_fmt_human_readable;
+  test_option_fmtr.process_option = user_defined_option;
+
+  const struct table_formatter *tmp_fmtr = tbl->formatter;
+  tbl->formatter = &test_option_fmtr;
+
   const char *rv = table_set_option(tbl, "invalid:option");
   if(rv) printf("Tableprinter option parser returned error: \"%s\".\n", rv);
 
@@ -155,6 +160,8 @@ static void test_option_parser(struct table *tbl)
 
   rv = table_set_option(tbl, "valuekey:value");
   if(rv) printf("Tableprinter option parser returned error: \"%s\".\n", rv);
+
+  tbl->formatter = tmp_fmtr;
 }
 
 int main(int argc UNUSED, char **argv)
diff --git a/ucw/table.c b/ucw/table.c
index 5260a565..272b694c 100644
--- a/ucw/table.c
+++ b/ucw/table.c
@@ -131,7 +131,7 @@ void table_end(struct table *tbl)
 
 /*** Configuration ***/
 
-void table_set_formatter(struct table *tbl, struct table_formatter *fmt)
+void table_set_formatter(struct table *tbl, const struct table_formatter *fmt)
 {
   tbl->formatter = fmt;
 }
@@ -503,7 +503,7 @@ static void table_start_human_readable(struct table *tbl)
   }
 }
 
-struct table_formatter table_fmt_human_readable = {
+const struct table_formatter table_fmt_human_readable = {
   .row_output = table_row_human_readable,
   .table_start = table_start_human_readable,
 };
@@ -537,7 +537,7 @@ static void table_start_machine_readable(struct table *tbl)
   }
 }
 
-struct table_formatter table_fmt_machine_readable = {
+const struct table_formatter table_fmt_machine_readable = {
   .row_output = table_row_machine_readable,
   .table_start = table_start_machine_readable,
 };
@@ -561,7 +561,7 @@ static void table_start_blockline(struct table *tbl)
   }
 }
 
-struct table_formatter table_fmt_blockline = {
+const struct table_formatter table_fmt_blockline = {
   .row_output = table_row_blockline_output,
   .table_start = table_start_blockline
 };
diff --git a/ucw/table.h b/ucw/table.h
index 4f5d98a2..81d1aa64 100644
--- a/ucw/table.h
+++ b/ucw/table.h
@@ -77,7 +77,7 @@
 
 // FIXME: update documentation according to the changes made in recent commits!
 
-/** Types of columns. These are seldom used explicitly, using a column definition macro is preferred. **/
+/** The COL_TYPE_ANY macro specifies a column type which can be filled with arbitrary type. **/
 
 #define COL_TYPE_ANY      NULL
 
@@ -132,7 +132,7 @@ struct table_template {
   uint cols_to_output;                      // [*] Number of columns that are printed
   const char *col_delimiter;                // [*] Delimiter that is placed between columns
   // Back-end used for table formatting and its private data
-  struct table_formatter *formatter; // FIXME: should be const?
+  const struct table_formatter *formatter; // FIXME: should be const?
 };
 
 /**
@@ -162,7 +162,7 @@ struct table {
   int col_out;				// Index of the column that is currently printed using fb_col_out
 
   // Back-end used for table formatting and its private data
-  struct table_formatter *formatter;
+  const struct table_formatter *formatter;
   void *data;
 };
 
@@ -387,7 +387,7 @@ const char *table_set_col_order_by_name(struct table *tbl, const char *col_order
 /**
  * Sets table formatter. See below for the list of formatters.
  **/
-void table_set_formatter(struct table *tbl, struct table_formatter *fmt);
+void table_set_formatter(struct table *tbl, const struct table_formatter *fmt);
 
 /**
  * Set a table option. All options have a key and a value. Currently,
@@ -446,15 +446,15 @@ struct table_formatter {
 };
 
 /** Standard formatter for human-readable output. **/
-extern struct table_formatter table_fmt_human_readable;
+extern const struct table_formatter table_fmt_human_readable;
 
 /** Standard formatter for machine-readable output (tab-separated values). **/
-extern struct table_formatter table_fmt_machine_readable;
+extern const struct table_formatter table_fmt_machine_readable;
 
 /**
  * Standard formatter for block output. Each cell is output on its own line
  * of the form `column_name: value`. Rows are separated by blank lines.
  **/
-extern struct table_formatter table_fmt_blockline;
+extern const struct table_formatter table_fmt_blockline;
 
 #endif
-- 
2.39.2