From 5a0ce6d53cccb8c4963cf6e71875df9cf6f59bb4 Mon Sep 17 00:00:00 2001
From: Ahurac <ahurac@mailbox.org>
Date: Wed, 25 Sep 2024 13:39:42 +0000
Subject: [PATCH] init: code du lecteur de stdin

---
 .gitignore |  1 +
 Makefile   |  9 +++++++++
 src/main.c | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e2e7327
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/out
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f4901e8
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: all clean
+
+all: out out/sh
+
+out:
+	mkdir -p -- $@
+
+out/sh: $(wildcard src/*.c)
+	cc -g -Wall -Wextra -Werror -ansi -o $@ $^
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..25467f2
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main() {
+  size_t buffer_size;
+  size_t initial_buffer_size = 64;
+  char *input_buffer;
+  char *initial_buffer_position;
+  unsigned int how_many_characters_to_read;
+
+  while (1) {
+    buffer_size = initial_buffer_size;
+    how_many_characters_to_read = buffer_size + 1;
+    input_buffer = malloc(how_many_characters_to_read);
+    initial_buffer_position = input_buffer;
+
+    printf("shell> ");
+    while (fgets(input_buffer, how_many_characters_to_read, stdin) != NULL &&
+           input_buffer[strlen(input_buffer) - 1] != '\n') {
+      size_t new_buffer_size = buffer_size * 2;
+      if (buffer_size != initial_buffer_size) {
+        how_many_characters_to_read = buffer_size + 1;
+      }
+      input_buffer = realloc(initial_buffer_position, new_buffer_size + 1);
+      initial_buffer_position = input_buffer;
+      input_buffer += buffer_size;
+      buffer_size = new_buffer_size;
+    }
+    input_buffer = initial_buffer_position;
+
+    printf("%s", input_buffer);
+
+    free(input_buffer);
+  }
+}