Provision for rot13 print

Author: gr8justus

_printf.c

@@ -77,6 +77,9 @@ int p_func(va_list ap, char specifier)
 		case '%':
 			char_count += write(1, "%", 1);
 			break;
+		case 'R':
+			char_count += rot13(ap);
+			break;
 	}
 	va_end(ap);
 	return (char_count);

main.h

@@ -1,5 +1,6 @@
 #ifndef MAIN_H
 #define MAIN_H
+#include <unistd.h>
 #include <stdarg.h>
 #include <string.h>
 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
@@ -9,8 +10,8 @@ int _printf(const char *format, ...);
 int print_char(va_list);
 int print_string(va_list);
 int p_func(va_list, char);
-void print_error(char *);
 int parse_format(const char *);
+int rot13(va_list);
 
 void *alloc(size_t);
 char *int_to_string(long);

parser.c

@@ -22,7 +22,7 @@ int parse_format(const char *fmt)
 			/* char fmt[i] does not denote allowed specifier */
 			if (fmt[i + 1] != 'c' && fmt[i + 1] != 's' && fmt[i +
 					1] != '%' && fmt[i + 1] != 'd' && fmt[i
-					+ 1] != 'i')
+					+ 1] != 'i' && fmt[i + 1] != 'R')
 			{
 				ret_val = 0;
 				break;

print_conversions.c

@@ -0,0 +1,41 @@
+#include "main.h"
+
+/**
+ * rot13 - prints the rotated position of a string
+ * @ap: String to rotate
+ * Description: Rotates each character of a string to
+ * the next thirteenth position in the alphabet.
+ * Return: char printed to stdout.
+ */
+int rot13(va_list ap)
+{	char *str = NULL;
+	char c;
+	int count = 0;
+
+	str = va_arg(ap, char *);
+	while (*str)
+	{
+		if (*str >= 97 && *str <= 109) /* Rotates a - m to n - z */
+		{
+			c = *str + 13;
+			count += write(1, &c, 1);
+		}
+		if (*str >= 110 && *str <= 122) /* Rotates n - z to a - m */
+		{
+			c = *str - 13;
+			count += write(1, &c, 1);
+		}
+		if (*str >= 65 && *str <= 77) /* Rotates A - M to N - Z */
+		{
+			c = *str + 13;
+			count += write(1, &c, 1);
+		}
+		if (*str >= 78 && *str <= 90) /* Rotates N - Z to A - M */
+		{
+			c = *str - 13;
+			count += write(1, &c, 1);
+		}
+		*++str;
+	}
+	return (count);
+}