From bd5268cd628d75dcf4214e7ee40f23904964baef Mon Sep 17 00:00:00 2001
From: XANTRONIX Development
Date: Sun, 10 Sep 2023 23:34:52 -0400
Subject: Completely nail inverse video

---
 main.c | 46 ++++++++++++++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/main.c b/main.c
index cf258c1..72a7d09 100644
--- a/main.c
+++ b/main.c
@@ -12,7 +12,7 @@
 #define ZXDUMP_STRIDE_GROUP 2
 #define ZXDUMP_CHARSET_LEN 64
 
-static uint16_t charset[ZXDUMP_CHARSET_LEN] = {
+static uint32_t zx_charset[ZXDUMP_CHARSET_LEN] = {
     0x0020, 0x2598, 0x259d, 0x2580, 0x2596, 0x258c, 0x259e, 0x259b,
     0x2592, '.',    '.',    '"',    0x00a3, '$',    ':',    '?',
     '(',    ')',    '>',    '<',    '=',    '+',    '-',    '*',
@@ -63,7 +63,21 @@ static inline size_t utf8_encode(uint8_t *buf, uint32_t codepoint) {
     }
 }
 
-static ssize_t dump_line(off_t offset, void *buf, size_t len) {
+static inline int zx_putchar(uint8_t c) {
+    uint8_t sequence[4];
+    size_t len = utf8_encode(sequence, zx_charset[c]);
+
+    if (fwrite(sequence, len, 1, stdout) < 1) {
+        goto error_io;
+    }
+
+    return 0;
+
+error_io:
+    return -1;
+}
+
+static ssize_t dump_line(off_t offset, void *buf, size_t len, int tty) {
     size_t i;
 
     if (printf("%08zx: ", offset) < 0) {
@@ -96,18 +110,26 @@ static ssize_t dump_line(off_t offset, void *buf, size_t len) {
         uint8_t c = ((uint8_t *)buf)[offset+i];
 
         if (c < ZXDUMP_CHARSET_LEN) {
-            uint16_t codepoint = charset[c];
-            uint8_t sequence[4];
-
-            size_t len = utf8_encode(sequence, codepoint);
-
-            /* XXX: Implement support for inverse colours */
-            if (fwrite(sequence, len, 1, stdout) < 1) {
+            if (zx_putchar(c) < 0) {
                 goto error_io;
             }
         } else {
-            if (putchar('.') < 0) {
-                goto error_io;
+            if (c >= 0xa0 && c <= 0xbf) {
+                if (tty && printf("\033[7m") < 0) {
+                    goto error_io;
+                }
+
+                if (zx_putchar(c - 0xa0) < 0) {
+                    goto error_io;
+                }
+
+                if (tty && printf("\033[27m") < 0) {
+                    goto error_io;
+                }
+            } else {
+                if (putchar('.') < 0) {
+                    goto error_io;
+                }
             }
         }
     }
@@ -148,7 +170,7 @@ static ssize_t dump_fd(int fd) {
             size_t left   = len - i,
                    linesz = left < ZXDUMP_STRIDE_LINE? left: ZXDUMP_STRIDE_LINE;
 
-            if (dump_line(offset, buf, linesz) < 0) {
+            if (dump_line(offset, buf, linesz, isatty(fileno(stdout))) < 0) {
                 goto error_dump_line;
             }
 
-- 
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