103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
/*
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* Win (Thanawin Pattanaphol)
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* vendorInfo.c
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* 8th August 2024
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_VENDORS 20
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#define MAX_FILENAME_LENGTH 4096
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int read_input(char str[], int n);
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struct vendor_item
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{
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char vendor_name[20];
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char merchandise[15];
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int inventory_count;
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int item_price_baht;
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} vendors[MAX_VENDORS];
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int main()
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{
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char file_name[MAX_FILENAME_LENGTH];
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printf("Enter name of input file: ");
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read_input(file_name, MAX_FILENAME_LENGTH);
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FILE *fp;
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if ((fp = fopen(file_name, "r")) == NULL)
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{
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printf("%s cannot be opened.\n", file_name);
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exit(EXIT_FAILURE);
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}
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// calculate file size
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fseek(fp, 0, SEEK_END);
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unsigned long file_size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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// read file to buffer
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char *file_buffer = (char *) malloc(file_size);
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int index = 0;
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while ((fgets(file_buffer, 50, fp) != NULL) && (index <= MAX_VENDORS))
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{
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char *token = strtok(file_buffer, " ");
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strncpy(vendors[index].vendor_name, token, strlen(token) + 1);
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token = strtok(NULL, " ");
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strncpy(vendors[index].merchandise, token, strlen(token) + 1);
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token = strtok(NULL, " ");
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vendors[index].inventory_count = atoi(token);
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token = strtok(NULL, " ");
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vendors[index].item_price_baht = atoi(token);
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index++;
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}
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int total_vendors = index - 1;
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printf("\n>>> Read %d vendors from file %s\n", total_vendors, file_name);
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for (int i = 0; i <= total_vendors; i++)
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{
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char vendor_info[200];
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sprintf(vendor_info, "%s sells %s for %d each",
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vendors[i].vendor_name,
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vendors[i].merchandise,
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vendors[i].item_price_baht
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);
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char vendor_stock[50];
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sprintf(vendor_stock, "Inventory %d items",
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vendors[i].inventory_count
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);
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printf("%-50s %s\n", vendor_info, vendor_stock);
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}
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fclose(fp);
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free(file_buffer);
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return 0;
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};
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int read_input(char str[], int n)
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{
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int ch, i = 0;
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while ((ch = getchar()) != '\n')
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{
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if (i < n)
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{
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str[i++] = ch;
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}
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}
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str[i] = '\0';
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return i;
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};
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