From 471825b0ac0c465e1942db08fd125f422a35f890 Mon Sep 17 00:00:00 2001
From: CismonX <admin@cismon.net>
Date: Sat, 30 Oct 2021 23:14:10 +0800
Subject: [PATCH] Refactor sixdraw code.

---
 examples/sixdraw.c | 77 ++++++++++++++++++++++++++++++----------------
 1 file changed, 50 insertions(+), 27 deletions(-)

diff --git a/examples/sixdraw.c b/examples/sixdraw.c
index dd4fbe3..4edf333 100644
--- a/examples/sixdraw.c
+++ b/examples/sixdraw.c
@@ -2,8 +2,8 @@
  * sixdraw.c - draw on your terminal
  * 
  * Requires sixel graphics and 1016 mouse mode to run on your terminal.
- * These features are not widely supported. To save yourself from trouble,
- * use a latest version of XTerm or mintty.
+ * These features are not widely supported.
+ * To save yourself from trouble, use a latest version of XTerm or mintty.
  * 
  * Before 1016 mode was introduced in XTerm patch #359, it is also possible
  * to report mouse position in pixels using DEC locator (which is also rarely
@@ -89,8 +89,11 @@ struct sixdraw_ctx {
 };
 
 static inline void
-print_error(struct sixdraw_ctx const *ctx, char const *format, ...)
-{
+print_error(
+    struct sixdraw_ctx const *ctx,
+    char               const *format,
+    ...
+) {
     char msg[1024];
     va_list args;
     va_start(args, format);
@@ -100,8 +103,9 @@ print_error(struct sixdraw_ctx const *ctx, char const *format, ...)
 }
 
 static void
-terminate(struct sixdraw_ctx *ctx)
-{
+terminate(
+    struct sixdraw_ctx *ctx
+) {
     ctlseqs_matcher_free(ctx->matcher);
     ctlseqs_reader_free(ctx->reader);
 
@@ -139,8 +143,9 @@ terminate(struct sixdraw_ctx *ctx)
 }
 
 static bool
-get_winsize(struct sixdraw_ctx *ctx)
-{
+get_winsize(
+    struct sixdraw_ctx *ctx
+) {
     struct winsize ws = { 0 };
     if (ioctl(ctx->in_fd, TIOCGWINSZ, &ws) != 0) {
         print_error(ctx, "failed to get terminal window size");
@@ -150,17 +155,20 @@ get_winsize(struct sixdraw_ctx *ctx)
         print_error(ctx, "failed to get terminal window size (in pixels)");
         return false;
     }
-    ctx->rows = ws.ws_row;
-    ctx->ch_width = ws.ws_xpixel / ws.ws_col;
-    ctx->ch_height = ws.ws_ypixel / ws.ws_row;
-    ctx->canvas_width = ctx->ch_width * ws.ws_col;
+    ctx->rows          = ws.ws_row;
+    ctx->ch_width      = ws.ws_xpixel / ws.ws_col;
+    ctx->ch_height     = ws.ws_ypixel / ws.ws_row;
+    ctx->canvas_width  = ctx->ch_width * ws.ws_col;
     ctx->canvas_height = ctx->ch_height * ws.ws_row - ctx->ch_height * 2;
     return true;
 }
 
 static bool
-decrqm(struct sixdraw_ctx *ctx, unsigned mode, char const *name)
-{
+decrqm(
+    struct sixdraw_ctx *ctx,
+    unsigned            mode,
+    char const         *name
+) {
     ssize_t retval;
     union ctlseqs_value *result = ctx->result;
     fprintf(ctx->out_file, CTLSEQS_DECRQM("%d"), mode);
@@ -181,7 +189,9 @@ decrqm(struct sixdraw_ctx *ctx, unsigned mode, char const *name)
 }
 
 static long
-xtversion(struct sixdraw_ctx *ctx) {
+xtversion(
+    struct sixdraw_ctx *ctx
+) {
     ssize_t retval;
     union ctlseqs_value *result = ctx->result;
     fprintf(ctx->out_file, CTLSEQS_XTVERSION());
@@ -209,8 +219,11 @@ xtversion(struct sixdraw_ctx *ctx) {
 }
 
 static void
-print_sixel_dot(struct sixdraw_ctx *ctx, unsigned x, unsigned y)
-{
+print_sixel_dot(
+    struct sixdraw_ctx *ctx,
+    unsigned            x,
+    unsigned            y
+) {
     if (x >= ctx->canvas_width || y >= ctx->canvas_height) {
         return;
     }
@@ -224,15 +237,21 @@ print_sixel_dot(struct sixdraw_ctx *ctx, unsigned x, unsigned y)
     row = y % ctx->ch_height;
     col = x % ctx->ch_width;
     unsigned seq_size = ctx->sixel_init_size;
-    seq_size += sprintf(sixel_seq + seq_size, "%.*s!%u?%c" CTLSEQS_ST,
-        row / 6, "------------------------", col, (1 << row % 6) + 0x3F);
+    seq_size += sprintf(
+        sixel_seq + seq_size,
+        "%.*s!%u?%c" CTLSEQS_ST,
+        row / 6, "------------------------", col, (1 << row % 6) + 0x3F
+    );
 
     fwrite(sixel_seq, seq_size, 1, ctx->out_file);
 }
 
 static bool
-init(struct sixdraw_ctx *ctx, int argc, char **argv)
-{
+init(
+    struct sixdraw_ctx *ctx,
+    int                 argc,
+    char               *argv[]
+) {
     *ctx = (struct sixdraw_ctx) {
         .prog_name  = argc > 0 ? argv[0] : "sixdraw",
         .out_file   = stdout,
@@ -303,8 +322,9 @@ init(struct sixdraw_ctx *ctx, int argc, char **argv)
 }
 
 static bool
-prepare(struct sixdraw_ctx *ctx)
-{
+prepare(
+    struct sixdraw_ctx *ctx
+) {
     // Check whether we're running on a terminal.
     if (!isatty(ctx->in_fd) || !isatty(ctx->out_fd)) {
         print_error(ctx, "this program can only run in a terminal");
@@ -443,8 +463,9 @@ prepare(struct sixdraw_ctx *ctx)
 }
 
 static bool
-draw(struct sixdraw_ctx *ctx)
-{
+draw(
+    struct sixdraw_ctx *ctx
+) {
     fprintf(
         ctx->out_file,
         CTLSEQS_CUP("%d", "1") "Canvas size: %ux%u. Line color: #%06X.",
@@ -478,8 +499,10 @@ draw(struct sixdraw_ctx *ctx)
 }
 
 int
-main(int argc, char **argv)
-{
+main(
+    int   argc,
+    char *argv[]
+) {
     int status;
     struct sixdraw_ctx ctx;
     if (init(&ctx, argc, argv) && prepare(&ctx)) {