commit 1b80b30b4dabc105183bf1e4e024aac8379f3e92
parent 39b651135bb7843c551f84bde3c9a3c0764b152f
Author: Michael Skec
Date:   Wed, 22 Nov 2023 17:44:41 +1100

unicode escape parsing

now parses roff \[uXXXX] unicode escape codes, and reverts previous
commit for non-standard superscripts.

Diffstat:
M
broff.c
 | 
21
++++++++++++++++++---

1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/broff.c b/broff.c
@@ -144,9 +144,6 @@ print_escaped(const char *line, int l)
         HANDLE_ESC("\\(aq", "'");
         HANDLE_ESC("\\(dq", "\"");
 
-        // Superscripts (not actual Roff escapes)
-        HANDLE_ESC("\\(Sc", "ᶜ");
-
         // TeX style typographer quotes; must be in this order
         HANDLE_ESC("``", "“");
         HANDLE_ESC("''", "”");
@@ -159,6 +156,24 @@ print_escaped(const char *line, int l)
         HANDLE_ESC("&", "&");
         HANDLE_ESC("...", "…");
 
+        // Check for unicode escapes, which can appear like \[uXXXX]
+        static const char *const UNICODE_ESC_PREFIX = "\\[u";
+        if (len_remain > strlen(UNICODE_ESC_PREFIX) &&
+            strncmp(c, UNICODE_ESC_PREFIX, strlen(UNICODE_ESC_PREFIX)) == 0)
+        {
+            // Find end of escape (denoted by right-square bracket)
+            c += strlen(UNICODE_ESC_PREFIX);
+            const char *c_prev = c;
+            for (; c < line + l && *c != ']'; ++c);
+
+            // Print the character as HTML escape.
+            printf("&#x%.*s;",
+                (int)(c - c_prev),
+                c_prev);
+
+            continue;
+        }
+
         if (ispunct(*c) && strchr(",.!?;:'\"", *c) == NULL)
         {
             // Escape characters that aren't alphanumeric and are not a