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README.md

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+# Ropipe
+> Convert roman numbers to integers and vice-versa in pipes
+## What is ropipe?
+Ropipe converts decimal integers to roman numbers and vice versa, reading from stdin and printing to stdout, it is meant to primarily be used in pipes.
+Default is integer to roman.
+## Options 
+* -r : Roman to integer. Integer to roman is the default.
+## Installation
+    1. Clone this repository
+    2. `cd` into it
+    3. run
+    ```sh
+    sudo bash install.sh
+    ```
+    (The program is compiled at this time, you may check the script and the program out beforehand)
+## Examples
+Once installed, you can find sample files in the project dir.
+```sh
+ropipe < arabic.txt
+```
+```sh
+ropipe -r < roman.txt
+```
+## Manpage
+
+A manpage is installed alongside the program, try running `man ropipe`
+
+## Updates
+
+There is no automatic update system as of yet, you are advised to regularly visit https://github.com/MatMasIt/ropipe, download and re-run the installer in order to get updates

arabic.txt

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+1
+10
+123
+321

install.sh

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+if [ $(id -u) -ne 0 ]
+  then echo "Please run as root"
+  exit
+fi
+if [ -z $(which gcc) ]
+  then echo "Please install gcc first"
+  exit
+fi
+echo "Compiling ropipe"
+gcc -o ropipe ropipe.c 
+mkdir -p /usr/local/share/man/man1/
+echo "Copying man file"
+cp ropipe.1 /usr/local/share/man/man1/ropipe.1
+echo "Installing binary"
+cp ropipe /usr/bin/ropipe
+echo "Done"

roman.txt

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+IV
+V
+VII
+MCC

ropipe.1

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+.TH ROPIPE 1 "06 October 2021"
+.SH NAME
+ropipe - Convert roman numbers to integers and vice-versa in pipes
+.SH SYNOPSIS
+ropipe [ -r ]
+.SH DESCRIPTION
+Ropipe converts decimal integers to roman numbers and vice versa, reading from stdin and printing to stdout, it is meant to primarily be used in pipes.
+Default is integer to roman.
+.SS Options
+.TP
+-r
+Roman to integer. Integer to roman is the default.
+.SH FILES
+.TP
+/usr/bin/ropipe
+The program
+.SH BUGS
+Send bug reports at https://github.com/MatMasIt/ropipe

ropipe.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define RDIGITS 14
+/*
+ * Returns the value of a roman numeral digit
+ * @param {char} c - Roman digit
+*/
+static int roman_to_integer(char c)
+{
+    switch (c)
+    {
+    case 'I':
+        return 1;
+    case 'V':
+        return 5;
+    case 'X':
+        return 10;
+    case 'L':
+        return 50;
+    case 'C':
+        return 100;
+    case 'D':
+        return 500;
+    case 'M':
+        return 1000;
+    default:
+        return 0;
+    }
+}
+/*
+ * Returns the interger value of a roman number
+ * @param {string} s - Roman number
+*/
+int roman_to_int(char *s)
+{
+    int i, int_num = roman_to_integer(s[0]);
+
+    for (i = 1; s[i] != '\0'; i++)
+    {
+        int prev_num = roman_to_integer(s[i - 1]);
+        int cur_num = roman_to_integer(s[i]);
+        if (prev_num < cur_num)
+        {
+            int_num = int_num - prev_num + (cur_num - prev_num);
+        }
+        else
+        {
+            int_num += cur_num;
+        }
+    }
+    return int_num;
+}
+/*
+ * Map of roman digits symbols and their value
+ * @elem {string} sym - digit symbol
+ * @elem {int} val - digit symbol
+*/
+typedef struct
+{
+    char *sym;
+    int val;
+} numeral;
+/*
+ * Returns greatest numeral index
+ * @elem {numeral} nu - map of roman digits symbols and their value
+ * @elem {int} num - number
+*/
+int maxNume(numeral *nu, int num)
+{
+    int i, index;
+    for (i = 0; i < RDIGITS; i++)
+    { //RDIGITS numerals in array
+        if (nu[i].val <= num)
+            index = i;
+    }
+    //gretest value numeral index, not greater than number
+    return index;
+}
+/*
+ * Prints roman number from integer
+ * @elem {numeral} nu - map of roman digits symbols and their value
+ * @elem {int} num - number
+*/
+void decToRoman(numeral *nu, int num)
+{
+    int max;
+    if (num != 0)
+    {
+        max = maxNume(nu, num);
+        printf("%s", nu[max].sym);
+        num -= nu[max].val;  //decrease number
+        decToRoman(nu, num); //recursively print numerals
+    }
+}
+/*
+ * Main
+ * @elem {int} argc - Argument count
+ * @elem {string[]} argv - Strings array
+*/
+int main(int argc, char *argv[])
+{
+    int direction = 0;
+    /*
+    * 0: integer to roman (default)
+    * 1: roman to integer
+    */
+    for (int i = 0; i < argc; i++)
+    {
+        if (strcmp(argv[i], "-r"))
+        {
+            direction = 1;
+        }
+        else
+        {
+            direction = 0;
+        }
+    }
+    numeral nume[RDIGITS] = {{"I", 1}, {"IV", 4}, {"V", 5}, {"IX", 9}, {"X", 10}, {"XL", 40}, {"L", 50}, {"XC", 90}, {"C", 100}, {"CD", 400}, {"D", 500}, {"CM", 900}, {"M", 1000}, {"MMMM", 4000}};
+    char *str1;
+    int inputint = 0;
+    switch (direction)
+    {
+    case 0:
+        while (scanf("%s", &str1) && !feof(stdin)) // read integers and convert to roman
+        {
+            printf("%d\n", roman_to_int(&str1));
+        }
+        break;
+    case 1:
+        while (scanf("%d", &inputint) && !feof(stdin)) // read roman and  convert to integers
+        {
+            decToRoman(nume, inputint);
+            printf("\n");
+        }
+        break;
+    }
+    return 0;
+}