From d7229970f8910aa756d299f8bdceee7f4d1fbfbc Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Wed, 8 Feb 2023 13:19:56 +0100
Subject: add env and make smash be able to parse files with comments

---
 smash/Makefile  |  2 +-
 smash/comment.c |  6 +++++
 smash/comment.h |  6 +++++
 smash/main.c    | 72 +++++++++++++++++++++++++++++++++++++++++++--------------
 4 files changed, 68 insertions(+), 18 deletions(-)
 create mode 100644 smash/comment.c
 create mode 100644 smash/comment.h

(limited to 'smash')

diff --git a/smash/Makefile b/smash/Makefile
index 8bae278..1d8e228 100644
--- a/smash/Makefile
+++ b/smash/Makefile
@@ -17,4 +17,4 @@ unit_test_exec:
 	./test
 
 all:
-	gcc main.c exec.c parser.c builtin.c ../lib/slib.a -static -nostdlib -fno-stack-protector -Wno-implicit-function-declaration -fno-builtin -o smash -DVARIABLES_UNIT_TEST -g
+	gcc main.c comment.c exec.c parser.c builtin.c ../lib/slib.a -static -nostdlib -fno-stack-protector -Wno-implicit-function-declaration -fno-builtin -o smash -DVARIABLES_UNIT_TEST -g
diff --git a/smash/comment.c b/smash/comment.c
new file mode 100644
index 0000000..8171cf1
--- /dev/null
+++ b/smash/comment.c
@@ -0,0 +1,6 @@
+#include "comment.h"
+
+void remove_comment(char *line) {
+	while (*line && *line != '#') ++line;
+	*line = 0;
+}
diff --git a/smash/comment.h b/smash/comment.h
new file mode 100644
index 0000000..f20877f
--- /dev/null
+++ b/smash/comment.h
@@ -0,0 +1,6 @@
+#ifndef COMMENT_H
+#define COMMENT_H
+
+void remove_comment(char *line);
+
+#endif
diff --git a/smash/main.c b/smash/main.c
index ed41b70..4d81f18 100644
--- a/smash/main.c
+++ b/smash/main.c
@@ -1,52 +1,90 @@
 #include "exec.h"
+#include "comment.h"
 
 #include "../lib/sys/io.h"
 #include "../lib/cstr/cstr.h"
 #include "../lib/sys/dup2.h"
+#include "../lib/sys/exit.h"
 
 #include "../lib/io/io.h"
 #include "../lib/sys/errno.h"
 
-#define BUFSIZ 1024
+#define BUFSIZ 16384
 
-void clear_buf(char *buf)
+char buf[BUFSIZ] = {0};
+int getline(int fd, char *linebuf)
 {
-	for (int i = 0; i < BUFSIZ; ++i)
-		buf[i] = 0;
+	u64 size = 0;
+	char *line = buf;
+
+	while (*line && *line != '\n') line++;
+
+	if (!*line) {
+		u64 s = cstr_length(buf);
+		s = read(fd, buf + s, BUFSIZ - s - 1);
+
+		if (s == 0) {
+			return -1;
+		}
+
+		buf[s] = 0;
+		while (*line && *line != '\n') line++;
+
+		if (!*line) {
+			wf(STDERR_FD, "line too long to handle, exiting.\n");
+			exit(-1);
+		}
+	}
+
+	*line = 0;
+	++line;
+
+	size = cstr_length(buf);
+	for (int i = 0; buf[i]; ++i) linebuf[i] = buf[i];
+	linebuf[size] = 0;
+
+	buf[0] = 0;
+	for (int i = 0; *line; ++i) {
+		buf[i] = *line;
+		buf[i + 1] = 0;
+		++line;
+	}
+
+	return size;
 }
 
 int main(int argc, char *argv[], char *envp[])
 {
-	char buf[BUFSIZ] = {0};
 	char prompt[] = "$ ";
-	u64 line_length;
+	i64 line_length;
 	int fd = STDIN_FD;
+	char linebuf[BUFSIZ];
 
 	if (argc == 2) {
 		fd = open(argv[1], OPEN_READ_ONLY, 0);
 
-		if (fd < 0)
-			wstdf("%s\n", errstr[-fd]);
+		if (fd < 0) {
+			wff(STDERR_FD, "smash: %s\n", errstr[-fd]);
+			return -1;
+		}
 	}
 
 	while (1) {
 		if (fd == STDIN_FD)
-			write(STDOUT_FD, prompt, cstr_length(prompt));
-		int p = read(fd, buf, BUFSIZ);
-		line_length = cstr_length(buf);
+			wstd(prompt);
 
+		line_length = getline(fd, linebuf);
 
-		if (line_length == 0)
+		if (line_length == -1) {
 			break;
+		}
 
-		if (buf[line_length - 1] == '\n')
-			buf[--line_length] = 0;
+		remove_comment(linebuf);
+		line_length = cstr_length(linebuf);
 
 		if (line_length > 0) {
-			exec(buf);
+			exec(linebuf);
 		}
-
-		clear_buf(buf);
 	}
 
 	if (fd != STDOUT_FD)
-- 
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