add option to cancel overwrites (#245)

liquidaty · Oct 28, 2024 · 71b86e9 · 71b86e9
1 parent 1b36fcd
commit 71b86e9
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Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/include/zsv/common.h b/include/zsv/common.h
@@ -107,6 +107,7 @@ struct zsv_opt_overwrite {
   enum zsv_status (*open)(void *ctx);
   enum zsv_status (*next)(void *ctx, struct zsv_overwrite_data *odata);
   enum zsv_status (*close)(void *ctx);
+  char cancel; // explicitly cancel application of overwrites
 };
 
 #endif

diff --git a/src/zsv_internal.c b/src/zsv_internal.c
@@ -703,7 +703,7 @@ static int zsv_scanner_init(struct zsv_scanner *scanner, struct zsv_opts *opts)
         (scanner->row.cells = calloc(scanner->row.allocated, sizeof(*scanner->row.cells)))) {
 #ifdef ZSV_EXTRAS
       // initialize overwrites
-      if (scanner->opts.overwrite.open) {
+      if (scanner->opts.overwrite.open && !scanner->opts.overwrite.cancel) {
         if (scanner->opts.overwrite.open(scanner->opts.overwrite.ctx) == zsv_status_ok) {
           scanner->overwrite.odata.have = 1;
           scanner->overwrite.next = scanner->opts.overwrite.next;