--- /dev/null
+/* Trailing whitespace test. Almost embarrassing, but trivial. */
+#include <tools/ccanlint/ccanlint.h>
+#include <ccan/talloc/talloc.h>
+#include <ccan/str/str.h>
+
+static char *report_on_trailing_whitespace(const char *line)
+{
+ const char *e = strchr(line, 0);
+ while (e>line && (e[-1]==' ' || e[-1]=='\t'))
+ e--;
+ if (*e == 0)
+ return NULL; //there were no trailing spaces
+ if (e == line)
+ return NULL; //the line only consists of spaces
+
+ if (strlen(line) > 20)
+ return talloc_asprintf(line, "...'%s'",
+ line + strlen(line) - 20);
+ return talloc_asprintf(line, "'%s'", line);
+}
+
+static void *check_trailing_whitespace(struct manifest *m)
+{
+ char *report;
+
+ report = report_on_lines(&m->c_files, report_on_trailing_whitespace,
+ NULL);
+ report = report_on_lines(&m->h_files, report_on_trailing_whitespace,
+ report);
+
+ return report;
+}
+
+static const char *describe_trailing_whitespace(struct manifest *m,
+ void *check_result)
+{
+ return talloc_asprintf(check_result,
+ "Some source files have trailing whitespace:\n"
+ "%s", (char *)check_result);
+}
+
+struct ccanlint trailing_whitespace = {
+ .name = "No lines with unnecessary trailing whitespace",
+ .total_score = 1,
+ .check = check_trailing_whitespace,
+ .describe = describe_trailing_whitespace,
+};