Stage 1 initial (w/ memory leaks) in test.c

src/main.c

@@ -34,6 +34,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 /* constants */
 #define STAGE_FORMATTING_STRING "========================="
@@ -77,14 +78,6 @@ int main(int argc, char *argv[]) {
     /* holds all the credit cards */
     credit_card_t all_cards[MAX_NUM_CARDS];
 
-    /* holds all the transactions */
-    transaction_t all_transactions[MAX_NUM_CARDS];
-    /*  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-     *  Dynamic memory allocation required as 
-     *  size of all_transactions isn't known
-     *  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-     */
-
     /* stage 1: reading one credit card record */
     stage_one();
     

src/test.c

@@ -0,0 +1,96 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+
+#define CREDIT_CARD_ID_LEN 8
+
+/* structure typedefs */
+typedef struct {
+    char card_id[CREDIT_CARD_ID_LEN];
+    int daily_lim;
+    int trans_lim;
+} credit_card_t;
+
+typedef struct {
+    char* str;
+} words_t;
+
+/* function prototypes */
+void stage_one(credit_card_t* all_cards, int* num_cards);
+void read_one_card(credit_card_t* one_card);
+
+int main(int argc, char *argv[]) {
+    /* all_cards will store all credit card information */
+    credit_card_t* all_cards = (credit_card_t*)malloc(sizeof(credit_card_t));
+    int num_cards = 0;
+    stage_one(all_cards, &num_cards);
+
+    free(all_cards);
+    all_cards = NULL;
+    return 0;
+}
+
+void stage_one(credit_card_t* all_cards, int* num_cards) {
+    printf("=========================Stage 1=========================\n");
+    credit_card_t curr_card;
+    read_one_card(&curr_card);
+    printf("Card ID: %s\n", curr_card.card_id);
+    printf("Daily limit: %d\n", curr_card.daily_lim);
+    printf("Transaction limit: %d\n", curr_card.trans_lim);
+    printf("\n");
+}
+
+/* read a line of input credit cards into one_card */
+void
+read_one_card(credit_card_t* one_card) {
+	int i = 0, c;
+    
+    /* records the length of the current field */
+    int index = 1;
+    char card_id_str[CREDIT_CARD_ID_LEN];
+    char* daily_lim_str = (char*)malloc(index * sizeof(char) + 1);
+    char* trans_lim_str = (char*)malloc(index * sizeof(char) + 1);
+    assert(daily_lim_str != NULL && trans_lim_str != NULL);
+
+    /* read the card ID from the input line */
+    while (((c = getchar()) != EOF) && (c != '\n') && (c != '\r')) {
+        if (i < CREDIT_CARD_ID_LEN) {
+            card_id_str[i++] = c;
+            index += 1;
+        } else {
+            break;
+        }
+    }
+    card_id_str[i] = '\0';
+
+    /* copy the card id to one_card */
+    strncpy(one_card->card_id, card_id_str, CREDIT_CARD_ID_LEN);
+    one_card->card_id[CREDIT_CARD_ID_LEN] = '\0';
+
+    /* read the daily limit from the input line */
+    i = 0;
+    while (((c = getchar()) != EOF) && (c != '\n') && (c != '\r')) {
+        if (c != ' ') {
+            daily_lim_str[i++] = c;
+            index += 1;
+        } else {
+            break;
+        }
+    }
+    daily_lim_str[i] = '\0';
+    one_card->daily_lim = atoi(daily_lim_str);
+
+    /* read the transaction limit from the input line */
+    i = 0;
+    while (((c = getchar()) != EOF) && (c != '\n') && (c != '\r')) {
+        trans_lim_str[i++] = c;
+        index += 1;
+    }
+    trans_lim_str[i] = '\0';
+    one_card->trans_lim = atoi(trans_lim_str);
+
+    free(daily_lim_str);
+    free(trans_lim_str);
+    daily_lim_str = trans_lim_str = NULL;
+}