level07: source code done

level07/source.c

@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int clear_stdin(void)
+{
+	char c;
+	do
+		c = getchar();
+	while (c != 10);
+	return c;
+}
+
+int get_unum()
+{
+	uint nb;
+
+	fflush(stdout);
+	scanf("%u", &nb);
+	clear_stdin();
+	return nb;
+}
+
+int store_number(char *data)
+{
+	unsigned int number;
+	unsigned int index;
+
+	printf(" Number: ");
+	number = get_unum();
+	printf(" Index: ");
+	index = get_unum();
+	if (index == 3 * (index / 3) || (number & 0xff00) == 183) {
+		puts(" *** ERROR! ***");
+		puts("   This index is reserved for wil!");
+		puts(" *** ERROR! ***");
+		return 1;
+	} else {
+		data[4 * index] = number;
+		return 0;
+	}
+}
+
+int read_number(char *data)
+{
+	int unum;
+
+	printf(" Index: ");
+	unum = get_unum();
+	printf(" Number at data[%u] is %u\n", unum, data[4 * unum]);
+	return 0;
+}
+
+int main(int argc, const char **argv, const char **envp)
+{
+	char data[400];
+	int number;
+	char s[4];
+	int a = 0, b = 0, c = 0, d = 0;
+
+	s[0] = 0;
+	memset(data, 0, sizeof(data));
+	while (*argv) {
+		memset((void *)*argv, 0, strlen(*argv));
+		++argv;
+	}
+	while (*envp) {
+		memset((void *)*envp, 0, strlen(*envp));
+		++envp;
+	}
+	puts("----------------------------------------------------\n"
+	     "  Welcome to wil's crappy number storage service!   \n"
+	     "----------------------------------------------------\n"
+	     " Commands:                                          \n"
+	     "    store - store a number into the data storage    \n"
+	     "    read  - read a number from the data storage     \n"
+	     "    quit  - exit the program                        \n"
+	     "----------------------------------------------------\n"
+	     "   wil has reserved some storage :>                 \n"
+	     "----------------------------------------------------\n");
+	while (1) {
+		printf("Input command: ");
+		number = 1;
+		fgets(s, 20, stdin);
+		s[strlen(s) - 1] = '\0';
+		if (!memcmp(s, "quit", 4))
+			return 0;
+		if (!memcmp(s, "store", 5))
+			number = store_number(data);
+		if (!memcmp(s, "read", 4))
+			number = read_number(data);
+		if (number)
+			printf(" Failed to do %s command\n", s);
+		else
+			printf(" Completed %s command successfully\n", s);
+		s[0] = 0;
+		a = 0;
+		b = 0;
+		c = 0;
+		d = 0;
+	}
+}