add file operation

file.c

@@ -0,0 +1,53 @@
+#include "file.h"
+#include <stdio.h>
+/*
+ * Here we load a file and write the file as string to a memory address:
+ * Input:
+ *      char* fname: the name of the file to open
+ *      int cbSize: the size of the strContent
+ * Output:
+ *      char **strContent: a pointer to a address where you have to allocate enougth memory to store the whole file
+ *      int neededSize: this returns the needed size of the buffer strContent
+ *
+ *  Note:
+ *      to get the size define strContent as NULL, then the needed size will return the needed buffersize
+ *
+ *
+ */
+int getFile(char *fname, char **strContent,int cbSize,long *neededSize)
+{
+    FILE *hfile = fopen(fname,"r");
+    long file_size=0;
+    int ret=0;
+    if(hfile == NULL)
+    {
+        return FILE_ERROR_OPEN;
+    }
+   fseek(hfile,0,SEEK_END);
+   file_size = ftell(hfile);
+    if(strContent == NULL) //we must determine the size and return to neededSize
+    {
+        *neededSize = file_size;
+        fclose(hfile);
+        return NO_ERROR;
+    }
+
+    if(cbSize < file_size)
+    {
+        *neededSize = file_size;
+        fclose(hfile);
+        return FILE_ERROR_STRCONTENT_TO_SMALL;
+    }
+
+    fseek(hfile,0,SEEK_SET);
+    ret=fread(*strContent,file_size,1,hfile);
+    if(ret != 1)
+    {
+        printf("Reading error read and should read missmatch\nnumber written elements:%d\n",
+                ret);
+        fclose(hfile);
+        return FILE_ERROR_READ_MISMATCH;
+    }
+    fclose(hfile);           
+    return NO_ERROR;
+}

file.h

@@ -0,0 +1,8 @@
+#define NO_ERROR 0
+
+//ERRORS
+#define FILE_ERROR_OPEN 11
+#define FILE_ERROR_STRCONTENT_TO_SMALL 12
+#define FILE_ERROR_READ_MISMATCH 13
+
+int getFile(char *fname, char **strContent,int cbSize,long *neededSize);

test.c

@@ -1,6 +1,7 @@
 #include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
+#include "file.h"
 
 int main(void)
 {
@@ -24,6 +25,7 @@ int main(void)
    char testpair[] = "asifdsfo=s1254124";
    char *keyName=NULL;
    char *keyValue=NULL;
+   char *content=NULL;
    
    keyName = malloc(MAX_LEN_SECTIONNAME);
    keyValue = malloc(MAX_LEN_SECTIONNAME);
@@ -37,6 +39,26 @@ int main(void)
    }else{
        printf("error getNameValuePair: %d\n",ret);
    }
+    
+    long neededSize=0;
+    if((ret=getFile("config.cfg",NULL,0,&neededSize))==NO_ERROR)
+    {
+        printf("sucessfull retrieved size:%ld\n",neededSize);
+    }
+    else {
+        printf("Error on getFile:%d\n",ret);
+    }
+    content = malloc(neededSize);
+    if((ret=getFile("config.cfg",&content,neededSize,&neededSize))==NO_ERROR)
+    {
+        printf("Sucessfull read file into buffer:%s\n---\n",content);
+    }
+    else {
+        printf("Error on getFile:%d\n",ret);
+    }
+
+
+
 
    free(keyValue);
    free(keyName);
@@ -44,3 +66,4 @@ int main(void)
 
    
 }
+