feat(file): implemented read file for linux

include/cosms-core/file.h

@@ -9,12 +9,20 @@
 #ifndef COSMS_CORE_FILE
 #define COSMS_CORE_FILE
 
+#include <stdbool.h>
+
 typedef enum {
     COSMS_FILE_OK = 0,
     COSMS_FILE_NOT_FOUND = -1,
+    COSMS_FILE_NO_ACCESS = -2,
+    COSMS_FILE_LIMIT_REACHED = -3,
+    COSMS_FILE_COULD_NOT_READ_SIZE = -4,
+    COSMS_FILE_UNKOWN_ERROR = -5,
+    COSMS_FILE_FAILED_TO_ALLOCATE = -6,
+    COSMS_FILE_FAILED_TO_READ = -7,
 } CosmsFileError;
 
-CosmsFileError cosms_core_file_read(char *path);
+CosmsFileError cosms_core_file_read(const char *path, char **content, unsigned int *size);
-CosmsFileError cosms_core_file_write(char *path);
+CosmsFileError cosms_core_file_write(const char *path, const char *content, unsigned int size, bool override);
 
 #endif

src/file.c

@@ -8,14 +8,67 @@
  */
 #include "cosms-core/file.h"
 
-#include <stdio.h>
+#include <stdlib.h>
 
-CosmsFileError cosms_core_file_read(char *path) {
+#if defined(__GNUC__)
-	printf("Hello, World!");
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <errno.h>
+#elif defined(_WIN32)
+#endif
+
+CosmsFileError cosms_core_file_read(const char *path, char **content, unsigned int *size) {
+    #if defined(__GNUC__)
+    int file = open(path, O_RDONLY);
+    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;
+        }
+    }
+    
+    struct stat file_stat;
+    if (stat(path, &file_stat) != 0) {
+        close(file);
+        return COSMS_FILE_COULD_NOT_READ_SIZE;
+    }
+
+    *size = file_stat.st_size;
+    *content = (char*)malloc(file_stat.st_size * sizeof(char));
+    if (content == NULL) {
+        close(file);
+        return COSMS_FILE_FAILED_TO_ALLOCATE;
+    }
+    
+    unsigned int remaining_bytes = file_stat.st_size;
+    while (remaining_bytes != 0) {
+        int read_bytes = read(file, *content, remaining_bytes);
+        if (read_bytes == -1) {
+            free(content);
+            close(file);
+            return COSMS_FILE_FAILED_TO_READ;
+        }
+
+        remaining_bytes -= read_bytes;
+    }
+    
+    close(file);
+    #elif defined(_WIN32)
+    #endif
     return COSMS_FILE_OK;
 }
 
-CosmsFileError cosms_core_file_write(char *path) {
+CosmsFileError cosms_core_file_write(const char *path, const char *content, unsigned int size, bool override) {
-	printf("Hello, World");
     return COSMS_FILE_OK;
 }

tests/main.c

@@ -1,6 +1,16 @@
 #include <cosms-core/file.h>
 
+#include <stdio.h>
+
 int main(void) {
-	cosms_core_file_read("test.txt");
+    unsigned int buffer_size;
+    char *buffer;
+	CosmsFileError error = cosms_core_file_read("test.txt", &buffer, &buffer_size);
+    if (error != COSMS_FILE_OK) {
+        fprintf(stderr, "failed to read file exited with error code: %d\n", error);
+        return -1;
+    }
+
+    printf("File read with content:\n %s\n", buffer);
 	return 0;
 }