Initial Commit
This commit is contained in:
Emma Nora Theuer
parent
a8ca938a9e
commit
457e322c02
6 changed files with 403 additions and 0 deletions
36
Workbook/Makefile
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36
Workbook/Makefile
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##
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# TH WWS
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#
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# @file
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# @version 0.1
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CC = gcc
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CFLAGS ?= -Wall -Wextra -Iinclude -fomit-frame-pointer -O2
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SRC_DIR = src
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INCLUDE_DIR = include
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BUILD_DIR = build
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TARGET = WWS_System
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SRC_FILES = $(wildcard $(SRC_DIR)/*.c)
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OBJ_FILES = $(patsubst $(SRC_DIR)/%.c, $(BUILD_DIR)/%.o, $(SRC_FILES))
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.PHONY: all clean
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all: $(BUILD_DIR) $(TARGET)
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# Link all the files into the final executable
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$(TARGET): $(OBJ_FILES)
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$(CC) $(OBJ_FILES) -o $@
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# Compile source- and object files
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$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
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$(CC) $(CFLAGS) -c $< -o $@
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#Ensure the build directory exists
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$(BUILD_DIR):
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mkdir -p $(BUILD_DIR)
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# Clean build and target
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clean:
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rm -Rf $(BUILD_DIR) $(TARGET)
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# end
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20
Workbook/include/util.h
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20
Workbook/include/util.h
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#ifndef UTIL_H_
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#define UTIL_H_
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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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#include <stdbool.h>
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#include <ctype.h>
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#include <limits.h>
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// Magic number to be returned in case something goes wrong. Lets the program know an error occured. This is kind of a hack.
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#define ERRORRETURN 10787253
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void null_terminate(char str[]);
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bool is_num(char *str);
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bool is_int(char *str);
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int get_clean_int();
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double get_clean_num();
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bool is_safe(const char* string);
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#endif // UTIL_H_
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44
Workbook/include/wws.h
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44
Workbook/include/wws.h
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#ifndef WWS_H_
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#define WWS_H_
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#include "util.h"
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#define ARRSIZE 4096
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#define EXITVAL 15326
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typedef struct Product Product;
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typedef struct Customer Customer;
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struct Product {
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int id;
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char* name;
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double price;
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int amount;
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};
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struct Customer {
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char* name;
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int id;
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// NOTE: Always NULL-initialize this!!
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Product* products[ARRSIZE];
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};
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// Implementation details
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int read_id();
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char* read_name();
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double read_price();
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int read_amount();
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int find_first_free_index(Customer customer);
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int find_product(Customer customer, int id); // Returns index of product
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int find_customer(int id); // Returns index in the customers array
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// Top-Level functions
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int add_product();
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int print_product();
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int add_customer();
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int print_customer();
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int menu();
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extern Customer customers[ARRSIZE];
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#endif // WWS_H_
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13
Workbook/src/main.c
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13
Workbook/src/main.c
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#include "wws.h"
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int main() {
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Customer customers[ARRSIZE];
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memset(customers, 0, sizeof(Customer));
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while(true) {
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int exitcode = menu();
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if (exitcode == EXITVAL) {
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return 0;
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}
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}
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return 0;
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}
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95
Workbook/src/util.c
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95
Workbook/src/util.c
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#include "util.h"
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bool is_num(char *str) {
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if (*str == '+' || *str == '-') {
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str++;
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}
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if (*str == '\0') {
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return false;
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}
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while (*str) {
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if (!isdigit((unsigned char)*str) || !(*str == '.')) {
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return true;
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}
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str++;
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}
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return false;
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}
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bool is_int(char *str) {
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if (*str == '+' || *str == '-') {
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str++;
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}
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if (*str == '\0') {
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return false;
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}
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while (*str) {
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if (!isdigit((unsigned char)*str)) {
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return true;
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}
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str++;
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}
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return true;
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}
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double get_clean_num() {
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char *buffer;
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size_t bufsize = 0;
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char *eptr;
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ssize_t input_length = getline(&buffer, &bufsize, stdin);
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if (input_length == -1) {
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printf("Fehler beim lesen des inputs.\n");
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free(buffer);
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buffer = NULL;
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return ERRORRETURN;
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}
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if (is_num(buffer)) {
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return strtod(buffer, &eptr);
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}
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printf("Deine Eingabe ist keine Zahl.\n");
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free(buffer);
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buffer = NULL;
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return ERRORRETURN;
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}
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int get_clean_int() {
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char *buffer;
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size_t bufsize = 0;
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ssize_t input_length = getline(&buffer, &bufsize, stdin);
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if (input_length == -1) {
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printf("Fehler beim lesen des inputs.\n");
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free(buffer);
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buffer = NULL;
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return ERRORRETURN;
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}
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if (is_int(buffer)) {
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return atoi(buffer);
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}
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printf("Deine Eingabe ist keine ganze Zahl.\n");
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free(buffer);
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buffer = NULL;
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return ERRORRETURN;
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}
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bool is_safe(const char* string) {
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if (string == NULL) {
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return false;
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}
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for (size_t i = 0; string[i] != '\0'; ++i) {
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if (string[i] == '%') {
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return false;
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}
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}
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return true;
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}
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195
Workbook/src/wws.c
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195
Workbook/src/wws.c
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#include "wws.h"
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#include "util.h"
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#include <stdio.h>
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int read_id() {
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printf("Produktnummer: ");
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int input = get_clean_int();
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if (input != ERRORRETURN) {return input;}
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else {
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printf("Die eingegebene Produktnummer ist keine Zahl.\n");
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return ERRORRETURN;
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}
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}
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char* read_name() {
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char* buffer;
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size_t buffsize = 0;
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printf("Name: ");
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ssize_t input_length = getline(&buffer, &buffsize, stdin);
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if (input_length == -1) {
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printf("Fehler beim lesen.\n");
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free(buffer);
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buffer = NULL;
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}
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return buffer;
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}
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double read_price() {
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printf("Preis: ");
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double price = get_clean_num();
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if (price == ERRORRETURN) {return ERRORRETURN;}
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return price;
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}
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int read_amount() {
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printf("Anzahl: ");
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int amount = get_clean_int();
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if (amount == ERRORRETURN) {return ERRORRETURN;}
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return amount;
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}
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int find_first_free_index(Customer customer) {
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for (int i = 0; i < ARRSIZE; i++) {
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if (customer.products[i] == NULL) {
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return i;
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}
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}
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printf("Für diesen Kunden können keine weiteren Produkte hinzugefügt werden.\n");
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return ERRORRETURN;
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}
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int find_product(Customer customer, int id) {
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for (int i = 0; i < ARRSIZE; i++) {
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if (customer.products[i]->id == id) {return i;}
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}
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return ERRORRETURN;
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}
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int find_customer(int id) {
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for (int i = 0; i < ARRSIZE; i++) {
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if (customers[i].id == id) {return id;}
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}
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return ERRORRETURN;
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}
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int add_product() {
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Product* new_product = (Product*) malloc(sizeof(Product));
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printf("**********************\n");
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printf("* WWS Produkteingabe *\n");
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printf("**********************\n");
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printf("Bitte geben Sie ihre Kundennumer ein: ");
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int customer_id = get_clean_int();
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if (customer_id == ERRORRETURN) {return ERRORRETURN;}
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Customer* customer = &customers[find_customer(customer_id)];
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new_product->id = read_id();
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if (new_product->id == ERRORRETURN) {return ERRORRETURN;}
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if (find_product(*customer, new_product->id)) {
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printf("Es existiert bereits ein Produkt mit dieser ID.\n");
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return ERRORRETURN;
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}
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new_product->name = read_name();
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if (!is_safe(new_product->name)) {
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printf("Der eingegebene Produktname enthält verbotene Zeichen.\n");
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return ERRORRETURN;
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}
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new_product->price = read_price();
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if (new_product->price == ERRORRETURN) {return ERRORRETURN;}
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new_product->amount = read_amount();
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if (new_product->amount == ERRORRETURN) {return ERRORRETURN;}
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int free_index = find_first_free_index(*customer);
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if (free_index == ERRORRETURN) {return ERRORRETURN;}
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customer->products[free_index] = new_product;
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return 0;
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}
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int print_product() {
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printf("**********************\n");
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printf("* WWS Produktausgabe *\n");
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printf("**********************\n");
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printf("Bitte geben Sie Ihre Kundennummer ein: ");
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int customer_id = get_clean_int();
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if (customer_id == ERRORRETURN) {return ERRORRETURN;}
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printf("Bitte geben Sie die gewünschte Produktnummer ein: ");
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int product_id = get_clean_int();
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if (product_id == ERRORRETURN) {return ERRORRETURN;}
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int product_index = find_product(customers[customer_id], product_id);
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if (product_index == ERRORRETURN) {
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printf("Die Produktnummer konnte nicht gefunden werden.\n");
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return ERRORRETURN;
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}
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Product* product = customers[customer_id].products[product_index];
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printf("Produktnummer: %d\n", product->id);
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printf("Produktname: %s\n", product->name);
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printf("Preis: %f\n", product->price);
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printf("Anzahl: %d\n", product->amount);
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return 0;
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}
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int add_customer() {
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Customer* new_customer = (Customer*) malloc(sizeof(Customer));
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if (new_customer == NULL) {
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printf("Fehler beim Speicher zuweisen");
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return ERRORRETURN;
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}
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printf("*********************\n");
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printf("* WWS Kundeneingabe *\n");
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printf("*********************\n");
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printf("Kundennummer: ");
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new_customer->id = get_clean_int();
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if (new_customer->id == ERRORRETURN) {return ERRORRETURN;}
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printf("Kundenname: ");
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new_customer->name = read_name();
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if (!is_safe(new_customer->name)) {
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printf("Der eigegebene Kundenname enthält verbotene Zeichen.\n");
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return ERRORRETURN;
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}
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for (int i = 0; i < ARRSIZE; i++) {
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if (customers[i].id == -1) {
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customers[i] = *new_customer;
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return 0;
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}
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}
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printf("Es können keine weiteren Kunden hinzugefügt werden.\n");
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return ERRORRETURN;
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}
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int print_customer() {
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printf("**********************\n");
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printf("* WWS Kundenausgabe *\n");
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printf("**********************\n");
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printf("Bitte geben Sie ihre Kundennummer ein: ");
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int id = get_clean_int();
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if (id == ERRORRETURN) {return ERRORRETURN;}
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int wanted_index = find_customer(id);
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if (wanted_index == ERRORRETURN) {
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printf("Die eingegebene Kundennummer konnte nicht gefunden werden.");
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return ERRORRETURN;
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}
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Customer customer = customers[wanted_index];
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printf("Kundennumer: %d\n", customer.id);
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printf("Name: %s\n", customer.name);
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return 0;
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}
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int menu() {
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printf("**********************\n");
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printf("* WWS Menüsystem *\n");
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printf("**********************\n");
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printf("1: Produkteingabe\n");
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printf("2: Produktausgabe\n");
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printf("3: Kundeneingabe\n");
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printf("4: Kundenausgabe\n");
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printf("5: Verlassen\n");
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printf("Auswahl: ");
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int input = get_clean_int();
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switch (input) {
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case 1:
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add_product();
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break;
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case 2:
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print_product();
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break;
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case 3:
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add_customer();
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break;
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case 4:
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print_customer();
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break;
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case 5:
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printf("Das System wird verlassen...\n");
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return EXITVAL;
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}
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return 0;
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}
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