From a15ba999d548f5e6d7537b725ea2275dc176f6f9 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Tue, 19 Oct 2021 12:39:17 +0200
Subject: [PATCH] Add a comment in the SVG exporter to explain buffer size

---
 caca/codec/export.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/caca/codec/export.c b/caca/codec/export.c
index 2670ad7..04c8552 100644
--- a/caca/codec/export.c
+++ b/caca/codec/export.c
@@ -863,7 +863,13 @@ static void *export_svg(caca_canvas_t const *cv, size_t *bytes)
     char *data, *cur;
     int x, y;
 
-    /* 200 is arbitrary but should be ok */
+    /* Use 200 as a safety value for character information size
+     *
+     * Worst case for background, 68 chars:
+     *   <rect style="fill:#fff" x="65535" y="65535" width="6" height="10"/>\n
+     * Worst case for foreground, 97 chars:
+     *   <text style="fill:#fff" font-weight="bold" font-style="italic" x="65535" y="65535">xxxxxx</text>\n
+     */
     *bytes = strlen(svg_header) + 128 + cv->width * cv->height * 200;
     cur = data = malloc(*bytes);