[lasem] str: add lsm_str_consolidate function.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit f3a9d2b681926020d0104898c9f6062cdbd22403
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Mon Nov 5 00:17:55 2012 +0100

    str: add lsm_str_consolidate function.

 src/lsmstr.h      |   38 ++++++++++++++++++++++++++++++++++++++
 tests/Makefile.am |    5 ++++-
 tests/str.c       |   45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+), 1 deletions(-)
---
diff --git a/src/lsmstr.h b/src/lsmstr.h
index 4e219c8..466915d 100644
--- a/src/lsmstr.h
+++ b/src/lsmstr.h
@@ -71,6 +71,44 @@ lsm_str_skip_colon_and_spaces (char **str)
 		(*str)++;
 }
 
+/**
+ * lsm_str_consolidate:
+ * @str: a utf8 string
+ *
+ * Removes trailing and heading ascii spaces from str, and reduce consecutive spaces to one space.
+ */
+
+static inline void
+lsm_str_consolidate (char *str)
+{
+	char *to_ptr;
+	char *from_ptr;
+
+	if (str == NULL)
+		return;
+
+	from_ptr = str;
+	to_ptr = str;
+	while (*from_ptr != '\0') {
+		if (g_ascii_isspace (*from_ptr)) {
+			if (to_ptr != str &&
+			    *(to_ptr - 1) != ' ') {
+				*to_ptr = ' ';
+				to_ptr++;
+			}
+		} else {
+			*to_ptr = *from_ptr;
+			to_ptr++;
+		}
+		from_ptr++;
+	}
+
+	if (to_ptr != str && *(to_ptr - 1) == ' ')
+		*(to_ptr - 1) = '\0';
+	else
+		*to_ptr = '\0';
+}
+
 G_END_DECLS
 
 #endif
diff --git a/tests/Makefile.am b/tests/Makefile.am
index c4b429a..aa99932 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -12,10 +12,13 @@ noinst_PROGRAMS = lsm-test
 lsm_test_SOURCES = lsmtest.c
 lsm_test_LDADD = $(test_progs_ldadd)
 
-TEST_PROGS += dom suite
+TEST_PROGS += dom suite str
 
 noinst_PROGRAMS += $(TEST_PROGS)
 
+str_SOURCES = str.c
+str_LDADD = $(test_progs_ldadd)
+
 dom_SOURCES = dom.c
 dom_LDADD = $(test_progs_ldadd)
 
diff --git a/tests/str.c b/tests/str.c
new file mode 100644
index 0000000..0b8064e
--- /dev/null
+++ b/tests/str.c
@@ -0,0 +1,45 @@
+#include <glib.h>
+#include <lsmstr.h>
+
+static void
+str_consolidate_test (void)
+{
+	char *string;
+
+	string = g_strdup ("   consolidate \n \t   test   \t \r a b c \n ");
+	lsm_str_consolidate (string);
+	g_assert_cmpstr (string, ==, "consolidate test a b c");
+	g_free (string);
+
+	string = g_strdup ("    ");
+	lsm_str_consolidate (string);
+	g_assert_cmpstr (string, ==, "");
+	g_free (string);
+
+	string = g_strdup ("");
+	lsm_str_consolidate (string);
+	g_assert_cmpstr (string, ==, "");
+	g_free (string);
+
+	string = NULL;
+	lsm_str_consolidate (string);
+	g_assert (string == NULL);
+}
+
+int
+main (int argc, char *argv[])
+{
+	int result;
+
+	g_test_init (&argc, &argv, NULL);
+
+	g_test_add_func ("/str/str-consolidate", str_consolidate_test);
+
+	g_type_init ();
+
+	result = g_test_run();
+
+	lsm_shutdown ();
+
+	return result;
+}