Make logging ninja friendly

When building with ninja instead of make __FILE__ will be relative
and logging therefore break. This moves stripping the path
from __FILE__ to runtime and handles a relative filepath as
well as a full one.

1 files changed, 26 insertions, 0 deletions

diff --git a/common/log.c b/common/log.c
index af07334a..1a4a28a8 100644
--- a/common/log.c
+++ b/common/log.c
@@ -58,3 +58,29 @@ void _wlr_log(log_importance_t verbosity, const char *fmt, ...) {
 	log_callback(verbosity, fmt, args);
 	va_end(args);
 }
+
+// strips the path prefix from filepath
+// will try to strip WLR_SRC_DIR as well as a relative src dir
+// e.g. '/src/build/wlroots/backend/wayland/backend.c' and
+// '../backend/wayland/backend.c' will both be stripped to
+// 'backend/wayland/backend.c'
+const char *_strip_path(const char *filepath) {
+	const char *srcit = WLR_SRC_DIR;
+	const char *fileit = filepath;
+
+	// remove WLR_SRC_DIR prefix
+	while(*fileit != '\0' && *srcit != '\0' && *fileit == *srcit) {
+		++fileit;
+		++srcit;
+	}
+	if(fileit != filepath) {
+		++fileit;
+	}
+
+	// remove relative prefix
+	while(*fileit == '.' || *fileit == '/') {
+		++fileit;
+	}
+
+	return fileit;
+}