C: struct, w/r into/from file, compare

articles.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define DEBUG 0

#define MAX_ENT 2
#define MAX_LEN 80
#define FILE_ART "articles.txt"
#define DELIM "|"

#define TYPES_CNT 4
#define DESC 0
#define PRICE 1
#define AMOUNT 2
#define UNIT 3

struct article {
	char desc[MAX_LEN];
	double price;
	int amount;
	char unit[MAX_LEN];
};

typedef struct article Article;

void scan(Article *s)
{
	for (int i = 0; i < MAX_ENT; i++) {
		printf("desc (*char): ");
		scanf("%s", s[i].desc);

		printf("price (double): ");
		scanf("%lf", &s[i].price);
		// s[i].price = strtod(input, &c);

		printf("amount (int): ");
		scanf("%d", &s[i].amount);
		// s[i].amount = strtol(input, &c, 10);

		printf("unit (*char): ");
		scanf("%s", s[i].unit);
	}
}

void writef(Article *s)
{
	FILE *file;

	remove(FILE_ART);
	file = fopen(FILE_ART, "a");

	for (int i = 0; i < MAX_ENT; i++) {
		if (DEBUG)
			printf("%s" DELIM "%.2f" DELIM "%d" DELIM "%s\n",
				    s[i].desc,
				    s[i].price,
				    s[i].amount,
				    s[i].unit);
		fprintf(file, "%s" DELIM "%.2f" DELIM "%d" DELIM "%s\n",
			s[i].desc,
			s[i].price,
			s[i].amount,
			s[i].unit);
	}

	fclose(file);
}

void read_struct(Article *s)
{
	FILE *file;
	file = fopen(FILE_ART, "r");

	char line[MAX_LEN];
	char *ptr;
	char *c;

	int i = 0;
	int j;
	while (fgets(line, sizeof(line), file) != NULL) {
		line[strlen(line) - 1] = '\0';
		ptr = strtok(line, "|");
		j = 0;
		while (ptr != NULL) {
			if (DEBUG)
				printf("%s\n", ptr);
			switch (j) {
			    case DESC:
				strcpy(s[i].desc, ptr);
				break;
			    case PRICE:
				s[i].price = strtod(ptr, &c);
				break;
			    case AMOUNT:
				s[i].amount = strtol(ptr, &c, 10);
				break;
			    case UNIT:
				strcpy(s[i].unit, ptr);
				break;
			    default:
				puts("Too many fields");
				exit(128);
			}
			ptr = strtok(NULL, "|");
			j++;
		}
		i++;
	}

	fclose(file);
}

void compare_struct(Article *s1, Article *s2, int ss1, int ss2)
{
	// TODO(d630): too stupid
	// int size_s1 = sizeof(s1)/sizeof(s1[0]);
	// int size_s2 = sizeof(s2)/sizeof(s2[0]);

	if (ss1 != ss2) {
		printf("Different length: %d != %d", ss1, ss2);
		exit(129);
	}

	int j;
	for (int i = 0; i < ss1; i++) {
		puts("");
		for (j = 0; j < TYPES_CNT; j++) {
			printf("%d,%d: ", i, j);
			switch (j) {
			    case DESC:
				printf("%d %s %s\n", strcmp(s1[i].desc, s2[i].desc),s1[i].desc, s2[i].desc );
				break;
			    case PRICE:
				printf("%d %.2f %.2f\n", !(s1[i].price == s2[i].price), s1[i].price, s2[i].price);
				break;
			    case AMOUNT:
				printf("%d %d %d\n", !(s1[i].amount == s2[i].amount), s1[i].amount, s2[i].amount);
				break;
			    case UNIT:
				printf("%d %s %s\n", strcmp(s1[i].unit, s2[i].unit), s1[i].unit, s2[i].unit);
				break;
			}
		}
	}

}

int main(void)
{
	Article a[MAX_ENT];
	Article b[MAX_ENT];

	scan(a);
	writef(a);
	read_struct(b);
	compare_struct(a, b, sizeof(a)/sizeof(a[0]), sizeof(b)/sizeof(b[0]));

	return 0;
}

s.c

// runs with -std=gnu99

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct artikel {
	char *desc;
	double price;
	int amount;
	char *unit;
};

int main()
{
	struct artikel art1 = {
		"foo",
		2.50,
		12,
		"liter"
	};

	struct artikel art2 = {
		"bar",
		1.50,
		3,
		"kg"
	};

	struct artikel *art3;
	art3 = malloc(sizeof(art3));
	art3->desc = strdup("lich");
	art3->price = 5.00;
	art3->amount = 222;
	art3->unit = strdup("liter");

	printf("%s\n", art3->desc);
	printf("%s\n", art3->unit);

	free(art3->desc);
	free(art3->unit);
	free(art3);

	return 0;
}

// vim set ft=c :