From ab72cefd6745a647dbd41a9814397873ab198e48 Mon Sep 17 00:00:00 2001
From: RunasSudo <runassudo@yingtongli.me>
Date: Thu, 15 May 2025 23:14:14 +1000
Subject: [PATCH] Re-implement output_variable_encoded to remove allocations

---
 README.md                |  4 +++-
 htmlcc/emitter/stdout.py | 41 ++++++++++------------------------------
 2 files changed, 13 insertions(+), 32 deletions(-)

diff --git a/README.md b/README.md
index 36cf907..73502e6 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ python -m htmlcc input.html > output.c
 
 By default, htmlcc emits C code which prints the generated HTML to standard output. An extensible framework is provided to customise this behaviour via the `--emitter` flag (see *htmlcc/emitter/cgit.py* for an example implementation).
 
-## Syntax
+## Features
 
 htmlcc syntax is based loosely on [Jinja](https://jinja.palletsprojects.com/en/stable/), using double curly braces.
 
@@ -28,6 +28,8 @@ The following language features are supported:
 * `{! ... !}` inserts raw C code, e.g. `{! foo.bar(); !}`.
 * `{# ... #}` is a comment, which is not included in the generated template.
 
+Using the default emitter, generated C code is cross-platform, has no dependencies, and requires no memory allocations.
+
 ## Example
 
 ```html
diff --git a/htmlcc/emitter/stdout.py b/htmlcc/emitter/stdout.py
index e566896..69a529e 100644
--- a/htmlcc/emitter/stdout.py
+++ b/htmlcc/emitter/stdout.py
@@ -22,42 +22,21 @@ class StdoutEmitter(Emitter):
 	def emit_preamble(self) -> None:
 		self.emit(r'''#include <stdbool.h>
 #include <stdio.h>
-#include <stdlib.h>
 
 void output_variable_encoded(char *variable, bool encode_quotes) {
-	// First compute size of buffer required
-	size_t extra_chars = 0;
-	char *ptr = variable;
-	for (; *ptr != '\0'; ptr++) {
-		if (*ptr == '&') { extra_chars += 4; }
-		if (*ptr == '<') { extra_chars += 3; }
-		if (*ptr == '"' && encode_quotes) { extra_chars += 5; }
-		if (*ptr == '\'' && encode_quotes) { extra_chars += 4; }
-	}
-	
-	size_t len = ptr - variable;
-	char *buf = malloc(len + extra_chars + 1);
-	
-	// Replace characters
-	char *c_inp = variable;
-	char *c_out = buf;
-	for (; *c_inp != '\0'; c_inp++) {
-		if (*c_inp == '&') {
-			*c_out++ = '&'; *c_out++ = 'a'; *c_out++ = 'm'; *c_out++ = 'p'; *c_out++ = ';';
-		} else if (*c_inp == '<') {
-			*c_out++ = '&'; *c_out++ = 'l'; *c_out++ = 't'; *c_out++ = ';';
-		} else if (*c_inp == '"' && encode_quotes) {
-			*c_out++ = '&'; *c_out++ = 'q'; *c_out++ = 'u'; *c_out++ = 'o'; *c_out++ = 't'; *c_out++ = ';';
-		} else if (*c_inp == '\'' && encode_quotes) {
-			*c_out++ = '&'; *c_out++ = '#'; *c_out++ = '3'; *c_out++ = '9'; *c_out++ = ';';
+	for (char *c = variable; *c != '\0'; c++) {
+		if (*c == '&') {
+			printf("%s", "&amp;");
+		} else if (*c == '<') {
+			printf("%s", "&lt;");
+		} else if (*c == '"' && encode_quotes) {
+			printf("%s", "&quot;");
+		} else if (*c == '\'' && encode_quotes) {
+			printf("%s", "&#39;");
 		} else {
-			*c_out++ = *c_inp;
+			putchar(*c);
 		}
 	}
-	*c_out = '\0';
-	
-	printf("%s", buf);
-	free(buf);
 }
 
 void output_variable_as_attr(char *variable) {