config.c: re-enable backslash continuation in config file

1 files changed, 31 insertions, 1 deletions

diff --git a/sway/config.c b/sway/config.c
index 4afa09b3..4177ea10 100644
--- a/sway/config.c
+++ b/sway/config.c
@@ -569,6 +569,36 @@ bool load_include_configs(const char *path, struct sway_config *config,
         return true;
 }
 
+// get line, with backslash continuation
+static ssize_t getline_with_cont(char **lineptr, size_t *line_size, FILE *file) {
+        char *next_line = NULL;
+        size_t next_line_size = 0;
+        ssize_t nread = getline(lineptr, line_size, file);
+        while (nread >= 2) {
+                if (strcmp(&(*lineptr)[nread - 2], "\\\n") != 0) {
+                        break;
+                }
+
+                ssize_t next_nread = getline(&next_line, &next_line_size, file);
+                if (next_nread == -1) {
+                        break;
+                }
+
+                nread += next_nread - 2;
+                if ((ssize_t) *line_size < nread + 1) {
+                        *line_size = nread + 1;
+                        *lineptr = realloc(*lineptr, *line_size);
+                        if (!lineptr) {
+                                nread = -1;
+                                break;
+                        }
+                }
+                strcpy(&(*lineptr)[nread - next_nread], next_line);
+        }
+        free(next_line);
+        return nread;
+}
+
 static int detect_brace(FILE *file) {
         int lines = 0;
         long pos = ftell(file);
@@ -633,7 +663,7 @@ bool read_config(FILE *file, struct sway_config *config,
         ssize_t nread;
         list_t *stack = create_list();
         size_t read = 0;
-        while ((nread = getline(&line, &line_size, file)) != -1) {
+        while ((nread = getline_with_cont(&line, &line_size, file)) != -1) {
                 if (reading_main_config) {
                         if (read + nread > config_size) {
                                 wlr_log(WLR_ERROR, "Config file changed during reading");