From 66ab9fbbdf61730cc237c566ccc2e89813b8a19d Mon Sep 17 00:00:00 2001
From: Mineplay <tristanfranssen@strawhats.nl>
Date: Fri, 5 Dec 2025 20:05:14 +0100
Subject: [PATCH] feat(file): implemented write file for linux

---
 include/cosms-core/file.h |  1 +
 src/file.c                | 43 ++++++++++++++++++++++++++++++++++++++-
 tests/main.c              |  8 ++++++++
 3 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/include/cosms-core/file.h b/include/cosms-core/file.h
index 2a25de2..f609ff4 100644
--- a/include/cosms-core/file.h
+++ b/include/cosms-core/file.h
@@ -20,6 +20,7 @@ typedef enum {
     COSMS_FILE_UNKOWN_ERROR = -5,
     COSMS_FILE_FAILED_TO_ALLOCATE = -6,
     COSMS_FILE_FAILED_TO_READ = -7,
+    COSMS_FILE_FAILED_TO_WRITE = -8,
 } CosmsFileError;
 
 CosmsFileError cosms_core_file_read(const char *path, char **content, unsigned int *size);
diff --git a/src/file.c b/src/file.c
index 2b7b53f..b3673af 100644
--- a/src/file.c
+++ b/src/file.c
@@ -53,7 +53,7 @@ CosmsFileError cosms_core_file_read(const char *path, char **content, unsigned i
     
     unsigned int remaining_bytes = file_stat.st_size;
     while (remaining_bytes != 0) {
-        int read_bytes = read(file, *content, remaining_bytes);
+        int read_bytes = read(file, (*content) + (file_stat.st_size - remaining_bytes), remaining_bytes);
         if (read_bytes == -1) {
             free(content);
             close(file);
@@ -66,9 +66,50 @@ CosmsFileError cosms_core_file_read(const char *path, char **content, unsigned i
     close(file);
     #elif defined(_WIN32)
     #endif
+
     return COSMS_FILE_OK;
 }
 
 CosmsFileError cosms_core_file_write(const char *path, const char *content, unsigned int size, bool override) {
+    #if defined(__GNUC__)
+    int file;
+    if (override) {
+        file = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+    } else {
+        file = open(path, O_WRONLY | O_APPEND);
+    }
+
+    if (file == -1) {
+        switch (errno) {
+            case ENOENT:
+                return COSMS_FILE_NOT_FOUND;
+
+            case EACCES:
+                return COSMS_FILE_NO_ACCESS;
+
+            case EMFILE:
+            case ENFILE:
+                return COSMS_FILE_LIMIT_REACHED;
+
+            default:
+                return COSMS_FILE_UNKOWN_ERROR;
+        }
+    }
+
+    unsigned int remaining_bytes = size;
+    while (remaining_bytes != 0) {
+        int written_bytes = write(file, content + (size - remaining_bytes), remaining_bytes);
+        if (written_bytes == -1) {
+            close(file);
+            return COSMS_FILE_FAILED_TO_WRITE;
+        }
+
+        remaining_bytes -= written_bytes;
+    }
+
+    close(file);
+    #elif defined(_WIN32)
+    #endif
+
     return COSMS_FILE_OK;
 }
diff --git a/tests/main.c b/tests/main.c
index c0c30cb..b63a90b 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -12,5 +12,13 @@ int main(void) {
     }
 
     printf("File read with content:\n %s\n", buffer);
+
+    char *temp_buffer = "Hello, World!";
+    error = cosms_core_file_write("write-file.txt", temp_buffer, 13, true);
+    if (error != COSMS_FILE_OK) {
+        fprintf(stderr, "failed to write file exited with error code: %d\n", error);
+        return -1;
+    }
+
 	return 0;
 }