Add a small patch-mode testing library

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index 9a8a6fc6b1e98162a1548b40bd4281172e18d7b2..ca198250c3082be82cdca09954198d6617b95bf8 100644 (file)
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -428,21 +428,27 @@ static void export_marks(char *file)
        uint32_t mark;
        struct object_decoration *deco = idnums.hash;
        FILE *f;
+       int e = 0;
 
        f = fopen(file, "w");
        if (!f)
-               error("Unable to open marks file %s for writing", file);
+               error("Unable to open marks file %s for writing.", file);
 
        for (i = 0; i < idnums.size; i++) {
                if (deco->base && deco->base->type == 1) {
                        mark = ptr_to_mark(deco->decoration);
-                       fprintf(f, ":%"PRIu32" %s\n", mark,
-                               sha1_to_hex(deco->base->sha1));
+                       if (fprintf(f, ":%"PRIu32" %s\n", mark,
+                               sha1_to_hex(deco->base->sha1)) < 0) {
+                           e = 1;
+                           break;
+                       }
                }
                deco++;
        }
 
-       if (ferror(f) || fclose(f))
+       e |= ferror(f);
+       e |= fclose(f);
+       if (e)
                error("Unable to write marks file %s.", file);
 }