solutions/The C Programming Language/1.19.c

#include <stdio.h>

#define MAXLINE 10

int _getline(char line[], int maxline);
void reverse(char to[], char from[], int from_head);

// reversing input string

main()
{
	int len;
	char line[MAXLINE];
	char reversed[MAXLINE];

	while ((len = _getline(line, MAXLINE)) > 0)
	{
		reverse(reversed, line, len);
		printf("%s\n", reversed);
	}

	return 0;
}

int _getline(char s[], int lim)
{
	int c, i, j;
	for (i = 0; (c = getchar()) != '\n'; ++i)
	{
		if (i < lim - 1)
			s[i] = c;
	}

	j = i;
	if (j > lim - 1)
		j = lim - 1;
	s[j] = '\0';
	return j - 1;
}

void reverse(char to[], char from[], int from_head)
{
	int i;
	for (i = 0; i <= (from_head / 2); ++i)
	{
		to[i] = from[from_head - i];
		to[from_head - i] = from[i];
	}
	to[from_head+1] = '\0';
}