Birdtest: Put hard new lines for strict line width

This patch ensures width of output lines from testing framework (not
debug output). So output piped lined into file that has default width 80
cols is now correctly wrapped.

1 files changed, 23 insertions, 9 deletions

diff --git a/test/birdtest.c b/test/birdtest.c
index 4e8645a4..a39e37f5 100644
--- a/test/birdtest.c
+++ b/test/birdtest.c
@@ -187,8 +187,7 @@ get_num_terminal_cols(void)
 static void
 bt_log_result(int result, const char *fmt, va_list argptr)
 {
-  char fmt_buf[BT_BUFFER_SIZE];
-  char msg_buf[BT_BUFFER_SIZE];
+  static char msg_buf[BT_BUFFER_SIZE];
   char *pos;
 
   snprintf(msg_buf, sizeof(msg_buf), "%s%s%s%s",
@@ -200,18 +199,33 @@ bt_log_result(int result, const char *fmt, va_list argptr)
 
   vsnprintf(pos, sizeof(msg_buf) - (pos - msg_buf), fmt, argptr);
 
-  /* 'll' means here Last Line */
-  uint cols = get_num_terminal_cols();
-  uint ll_len = (strlen(msg_buf) % cols) + BT_PROMPT_OK_FAIL_STRLEN;
-  uint ll_offset = (ll_len / get_num_terminal_cols() + 1) * cols - BT_PROMPT_OK_FAIL_STRLEN;
-  uint offset = ll_offset + (strlen(msg_buf) / cols) * cols;
-  snprintf(fmt_buf, sizeof(fmt_buf), "%%-%us%%s\n", offset);
+  int chrs = 0;
+  for (int i = 0; i < strlen(msg_buf); i += get_num_terminal_cols())
+  {
+    if (i)
+      printf("\n");
+    char *stop = msg_buf + i + get_num_terminal_cols();
+    char backup = *stop;
+    *stop = 0;
+    chrs = printf("%s", msg_buf + i);
+    *stop = backup;
+  }
+
+  int offset = get_num_terminal_cols() - chrs - BT_PROMPT_OK_FAIL_STRLEN;
+  if (offset < 0)
+  {
+    printf("\n");
+    offset = get_num_terminal_cols() - BT_PROMPT_OK_FAIL_STRLEN;
+  }
+
+  for (int i = 0; i < offset; i++)
+    putchar(' ');
 
   const char *result_str = is_terminal ? BT_PROMPT_OK : BT_PROMPT_OK_NO_COLOR;
   if (result != BT_SUCCESS)
     result_str = is_terminal ? BT_PROMPT_FAIL : BT_PROMPT_FAIL_NO_COLOR;
 
-  printf(fmt_buf, msg_buf, result_str);
+  printf("%s\n", result_str);
 }
 
 /**