Add localization support to com_err

* Add compile_et arguments --textdomain and --localedir.
* Store text domain and localedir at the end of error tables.
* error_message() calls dgettext if the table has a text domain.
* add_error_table() calls bindtextdomain if the table has a localedir.
* Define N_() as no-op in generated source and mark up error messages.
* When using system compile_et, test for --textdomain support.
* Use --textdomain option when available.
* Run xgettext over generated sources in compile_et rule.
* Translate com_err results in krb5int_get_error() if com_err won't.

ticket: 6918

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24960 dc483132-0cff-0310-8789-dd5450dbe970

4 files changed, 62 insertions, 13 deletions

diff --git a/src/util/et/compile_et.1 b/src/util/et/compile_et.1
index a082bca46..c9dff7815 100644
--- a/src/util/et/compile_et.1
+++ b/src/util/et/compile_et.1
@@ -8,6 +8,13 @@
 compile_et \- error table compiler
 .SH SYNOPSIS
 .B compile_et
+[
+.B \-\-textdomain
+.I domain
+[
+.B \-\-localedir
+.I dir
+] ]
 file
 .SH DESCRIPTION
 .B Compile_et
@@ -62,6 +69,17 @@ the ``.et'' suffix replaced by ``.c'' and ``.h''.
 A ``#'' in the source file is treated as a comment character, and all
 remaining text to the end of the source line will be ignored.
 
+If a text domain is provided with the
+.B \-\-textdomain
+option, error messages will be looked up in the specified domain with
+.BR gettext .
+If a locale directory is also provided with the
+.B \-\-localedir
+option, the text domain will be bound to the specified locale
+directory with
+.B bindtextdomain
+when the error table is initialized.
+
 .SH BUGS
 
 Since
diff --git a/src/util/et/compile_et.sh b/src/util/et/compile_et.sh
index adb0be666..f17ddba71 100755
--- a/src/util/et/compile_et.sh
+++ b/src/util/et/compile_et.sh
@@ -4,21 +4,33 @@
 AWK=@AWK@
 DIR=@DIR@
 
-usage="usage: $0 [ -d scriptDir ] inputfile.et"
+usage="usage: $0 [ -d scriptDir ] [ --textdomain domain [ --localedir dir ] ]"
+usage="$usage inputfile.et"
 
-if [ "$1" = "-d" ]; then
-    if [ $# -lt 3 ]; then
+TEXTDOMAIN=
+LOCALEDIR=
+
+while [ $# -ge 2 ]; do
+    if [ "$1" = "-d" ]; then
+	DIR=$2; shift; shift
+    elif [ "$1" = "--textdomain" ]; then
+	TEXTDOMAIN=$2; shift; shift
+    elif [ "$1" = "--localedir" ]; then
+	LOCALEDIR=$2; shift; shift
+    else
 	echo $usage 1>&2 ; exit 1
     fi
-    DIR=$2 ; shift ; shift
-fi
-if [ $# -ne 1 ]; then
+done
+
+# --localedir requires --textdomain.
+if [ $# -ne 1 -o \( -n "$LOCALEDIR" -a -z "$TEXTDOMAIN" \) ]; then
     echo $usage 1>&2 ; exit 1
 fi
 
 ROOT=`echo $1 | sed -e s/.et$//`
-BASE=`echo $ROOT | sed -e 's;.*/;;'`
+BASE=`echo "$ROOT" | sed -e 's;.*/;;'`
 
 set -ex
-$AWK -f ${DIR}/et_h.awk outfile=${BASE}.h $ROOT.et
-$AWK -f ${DIR}/et_c.awk outfile=${BASE}.c $ROOT.et
+$AWK -f ${DIR}/et_h.awk "outfile=${BASE}.h" "$ROOT.et"
+$AWK -f ${DIR}/et_c.awk "outfile=${BASE}.c" "textdomain=$TEXTDOMAIN" \
+    "localedir=$LOCALEDIR" "$ROOT.et"
diff --git a/src/util/et/error_message.c b/src/util/et/error_message.c
index 35d58f306..01f2c03ca 100644
--- a/src/util/et/error_message.c
+++ b/src/util/et/error_message.c
@@ -185,7 +185,11 @@ found:
     if (table->n_msgs <= (unsigned int) offset)
         goto no_table_found;
 
-    return table->msgs[offset];
+    /* If there's a string at the end of the table, it's a text domain. */
+    if (table->msgs[table->n_msgs] != NULL)
+        return dgettext(table->msgs[table->n_msgs], table->msgs[offset]);
+    else
+        return table->msgs[offset];
 
 no_table_found:
     k5_mutex_unlock(&et_list_lock);
@@ -290,6 +294,12 @@ add_error_table(const struct error_table *et)
     }
     e->next = et_list;
     et_list = e;
+
+    /* If there are two strings at the end of the table, they are a text domain
+     * and locale dir, and we are supposed to call bindtextdomain. */
+    if (et->msgs[et->n_msgs] != NULL && et->msgs[et->n_msgs + 1] != NULL)
+        bindtextdomain(et->msgs[et->n_msgs], et->msgs[et->n_msgs + 1]);
+
     return k5_mutex_unlock(&et_list_lock);
 }
 
diff --git a/src/util/et/et_c.awk b/src/util/et/et_c.awk
index cc277f5dc..35d924aa3 100644
--- a/src/util/et/et_c.awk
+++ b/src/util/et/et_c.awk
@@ -117,6 +117,8 @@ c2n["_"]=63
 	print "extern void initialize_" table_name "_error_table (void);" > outfile
 	print "#endif" > outfile
 	print "" > outfile
+	print "#define N_(x) (x)" > outfile
+	print "" > outfile
 	print "/* Lclint doesn't handle null annotations on arrays" > outfile
 	print "   properly, so we need this typedef in each" > outfile
 	print "   generated .c file.  */" > outfile
@@ -136,7 +138,7 @@ c2n["_"]=63
 
 (continuation == 1) && ($0 ~ /"[ \t]*$/) {
 #	printf "\t\t\"%s,\n", $0 > outfile
-	printf "\t%s,\n", cont_buf $0 > outfile
+	printf "\tN_(%s),\n", cont_buf $0 > outfile
 	continuation = 0;
 }
 
@@ -152,7 +154,7 @@ c2n["_"]=63
 	    text = text FS $i
 	}
 	text=substr(text,2,length(text)-1);
-	printf "\t%s,\n", text > outfile
+	printf "\tN_(%s),\n", text > outfile
 	table_item_count++
 }
 
@@ -179,7 +181,7 @@ c2n["_"]=63
 
 { 
 	if (skipone) {
-	    printf "\t%s,\n", $0 > outfile
+	    printf "\tN_(%s),\n", $0 > outfile
 	}
 	skipone=0
 }
@@ -188,6 +190,13 @@ END {
 	    print "Error table too large!" | "cat 1>&2"
 	    exit 1
 	}
+	# Put text domain and/or localedir at the end of the list.
+	if (textdomain) {
+	    printf "    \"%s\", /* Text domain */\n", textdomain > outfile
+	    if (localedir) {
+		printf "    \"%s\", /* Locale dir */\n", localedir > outfile
+	    }
+	}
 	print "    0" > outfile
 	print "};" > outfile
 	print "" > outfile