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Projects/תרץ1/ex13a.c

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+#include "Lib.h"
+
+#define APPEND_BINARY "a+b"
+#define FILE_NAME "starship.dat"
+#define PRINT "print"
+#define EXIT "exit"
+#define CREATE "create"
+#define UPDATE "update"
+
+typedef struct
+{
+    int id;
+    char name[8];
+    char star_name[15];
+    int age;
+} alien;
+
+
+// -------------------------------------------------------
+
+/* close file */
+int CloseFile(FILE * fp)
+{
+    return (fclose(fp));
+}
+
+/* print alien */
+void PrintAlien(alien * aln)
+{
+    printf("ID : %d\nName : %s\nStar Name : %s\nAlien age : %d\n\n", 
+            aln->id, aln->name, aln->star_name, aln->age);
+}
+
+/* get all data from file */
+void GetAllDataFromFile(alien ** aln_arr)
+{
+    alien * aln_data;
+    FILE * fp = fopen(FILE_NAME , APPEND_BINARY);
+    *aln_arr = (alien *)malloc((ftell(fp) / sizeof(alien)) + (TWO * sizeof(alien)));
+    aln_data = *aln_arr;
+    rewind(fp);
+    while (!feof(fp));
+    {
+        fread(aln_data, sizeof(alien), ONE, fp);
+        aln_data++;
+    }
+    aln_data->id = ZERO;
+    fclose(fp); // fix
+}
+
+/* print aliens in arr */
+void PrintArrayAliens(alien * arr_alien)
+{
+    while (arr_alien->id != ZERO)
+    {
+        PrintAlien(arr_alien);
+        arr_alien++;
+    }
+}
+
+/* print data */
+void PrintAllAlienData()
+{
+    alien * aliens_data;
+    GetAllDataFromFile(&aliens_data);
+    PrintArrayAliens(aliens_data);
+    free(aliens_data);
+    OutputErrorOpenReadFile();
+    
+}
+
+/* write in file */
+void WriteInFile(alien * aln, unsigned int location)
+{
+    FILE * fp = fopen(FILE_NAME , APPEND_BINARY);
+    fseek(fp, (sizeof(alien) * location), SEEK_SET);
+    fwrite(aln, sizeof(alien), ONE, fp);
+    CloseFile(fp);
+}
+
+/* check if the alien is exists in file */
+BOOLEAN ValueExistsInFile(alien * aln)
+{
+    alien * temp_aln = (alien *)malloc(sizeof(alien));
+    FILE * fp = fopen(FILE_NAME , APPEND_BINARY);
+    fseek(fp, ZERO, SEEK_SET);
+    while (fread(temp_aln, sizeof(alien), ONE, fp) > ZERO && temp_aln->id != aln->id);
+    CloseFile(fp);
+    return (temp_aln->id == aln->id);
+}
+
+/* Get the pointer of alien in file */
+unsigned int GetLocationValueInFile(alien * aln)
+{
+    FILE * fp;
+    unsigned int count = -ONE;
+    alien * temp_aln = (alien *)malloc(sizeof(alien));;
+    fp = fopen(FILE_NAME , APPEND_BINARY);
+    fseek(fp, ZERO, SEEK_SET);
+    while (fread(temp_aln, sizeof(alien), ONE, fp) > ZERO && temp_aln->id != aln->id)
+    {
+        count++;
+    }
+    CloseFile(fp);
+    return count;
+}
+
+void GetInputIdAlien(alien * aln)
+{
+    int id;
+    printf("Enter ID: ");
+    scanf("%d", &id);
+    aln->id = id;
+}
+
+void GetInputNameAlien(alien * aln)
+{
+    printf("Enter name: ");
+    scanf("%s", (aln->name));
+}
+
+void GetInputStarNameAlien(alien * aln)
+{
+    printf("Enter star name: ");
+    scanf("%s", (aln->star_name));
+}
+
+void GetInputAgeAlien(alien * aln)
+{
+    int age;
+    printf("Enter age: ");
+    scanf("%d", &age);
+    aln->age = age;
+}
+
+void GetInputUpdateAlien(alien * aln)
+{
+    GetInputNameAlien(aln);
+    GetInputStarNameAlien(aln);
+    GetInputAgeAlien(aln);
+}
+
+void GetInputAlien(alien * aln)
+{
+    GetInputIdAlien(aln);
+    GetInputUpdateAlien(aln);
+}
+
+/* create data */
+void CreateData(alien * aln)
+{
+    unsigned int location;
+    alien temp = *aln;
+    if (!ValueExistsInFile(&temp))
+    {
+        location = GetLocationValueInFile(aln) + ONE;
+        WriteInFile(aln, location);
+    }
+    else
+    {
+        printf("The alien is exists already!\n");
+    }
+}
+
+/* update data */
+void UpdateData(alien * aln)
+{
+    if (ValueExistsInFile(aln))
+    {   
+        GetInputUpdateAlien(aln);
+        WriteInFile(aln, GetLocationValueInFile(aln));
+    }
+    else
+    {
+        printf("The alien is not exists!\n");
+    }
+}
+
+
+//---------------------------------------------------------------------------------------
+//                                        Project
+//                                        -------
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : 211675038
+// Date       : 19.12.2019
+//---------------------------------------------------------------------------------------
+void main(void)
+{
+    string command = " ";
+    alien aln;
+    int id = ZERO;
+    string exit_command = EXIT;
+    string print_command = PRINT;
+    string create_command = CREATE;
+    string update_command = UPDATE;
+
+    while (!StringCompare(command, exit_command))
+    {
+        // print request for command
+        printf("Enter command (\"print\", \"create\", \"update\" and \"exit\"): ");
+
+        // Input command
+        scanf("%s", command);
+        if (StringCompare(command, print_command))
+        {
+            PrintAllAlienData();
+        }
+        else if (StringCompare(command, create_command))
+        {
+            /* get input from user about new alien */
+            /* if alien is not exists create new alien else output error */
+            GetInputAlien(&aln);
+            CreateData(&aln);
+        }
+        else if (StringCompare(command, update_command))
+        {
+            GetInputIdAlien(&aln);
+            UpdateData(&aln);  
+        }
+    }
+    
+}