From 6e40a34fef4b4b140442cc34408b2442043eba21 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Sat, 11 Feb 2023 18:08:55 +0100
Subject: chagne system structure and fix env

---
 lib/io/io.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/io/io.h |  1 +
 2 files changed, 49 insertions(+)

(limited to 'lib/io')

diff --git a/lib/io/io.c b/lib/io/io.c
index 2aefe1a..d8e8d18 100644
--- a/lib/io/io.c
+++ b/lib/io/io.c
@@ -2,6 +2,7 @@
 
 #include "../cstr/cstr.h"
 #include "../aec/aec.h"
+#include "../sys/types.h"
 
 void __wstdn(const char *buf, u64 n)
 {
@@ -92,6 +93,53 @@ void wff__(unsigned int fd, const char *buf, const void **args)
 		write(fd, start, buf - start);
 }
 
+
+char __buf[BUFSIZ] = { 0 };
+
+int get_next_line_from_fd(unsigned int fd, char *linebuf)
+{
+	u64 size = 0;
+	char *line = __buf;
+
+	while (*line && *line != '\n') line++;
+
+	if (!*line) {
+		size = cstr_length(__buf);
+		i64 s = read(fd, __buf + size, BUFSIZ - size - 1);
+
+		if (s == 0 && size == 0) {
+			return -1;
+		} else if (s == 0) {
+			for (int i = 0; i < size; ++i) linebuf[i] = __buf[i];
+			__buf[0] = 0;
+			return size;
+		}
+
+		__buf[s] = 0;
+		while (*line && *line != '\n') line++;
+
+		if (!*line) {
+			return -2;
+		}
+	}
+
+	*line = 0;
+	++line;
+
+	size = cstr_length(__buf);
+	for (int i = 0; __buf[i]; ++i) linebuf[i] = __buf[i];
+	linebuf[size] = 0;
+
+	int i = 0;
+	for (; *line; ++i) {
+		__buf[i] = *line;
+		++line;
+	}
+	__buf[i] = 0;
+
+	return size;
+}
+
 #ifdef IO_LIB_UNIT_TEST
 int main() {
 	wstdf("%s %S%F%s%S\n", "hallo", SGR_UNDERLINE, COLOR_RED, "welt", SGR_RESET);
diff --git a/lib/io/io.h b/lib/io/io.h
index 6bf0a3b..887d911 100644
--- a/lib/io/io.h
+++ b/lib/io/io.h
@@ -7,6 +7,7 @@ void          wstd(const char *buf);
 unsigned long rstd(char *buf, unsigned long count);
 void          wf(unsigned int fd, char *buf);
 void          putchar(const char c);
+int           get_next_line_from_fd(unsigned int fd, char *buf);
 
 void wstdf__(const char *buf, const void **args);
 void wff__(unsigned int fd, const char *buf, const void **args);
-- 
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