From 6e4c96b475edc880be09ef9b41addf2737da2446 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Mon, 11 Jan 2021 18:59:03 +0100
Subject: C solution for week 95/part 1

---
 challenge-095/abigail/README.md   |  1 +
 challenge-095/abigail/c/ch-1.c    | 47 +++++++++++++++++++++++++++++++++++++++
 challenge-095/abigail/t/ctest.ini |  6 +++++
 3 files changed, 54 insertions(+)
 create mode 100644 challenge-095/abigail/c/ch-1.c

diff --git a/challenge-095/abigail/README.md b/challenge-095/abigail/README.md
index c0798385a0..752fd8111b 100644
--- a/challenge-095/abigail/README.md
+++ b/challenge-095/abigail/README.md
@@ -20,6 +20,7 @@ Output: 0
 ~~~~
 
 ### Solutions
+* [C](c/ch-1.c)
 * [Node](node/ch-1.js)
 * [Perl](perl/ch-1.pl)
 
diff --git a/challenge-095/abigail/c/ch-1.c b/challenge-095/abigail/c/ch-1.c
new file mode 100644
index 0000000000..9ef4ace799
--- /dev/null
+++ b/challenge-095/abigail/c/ch-1.c
@@ -0,0 +1,47 @@
+# include <stdlib.h>
+# include <stdio.h>
+# include <string.h>
+# include <stdbool.h>
+
+int main (void) {
+    char *  line    = NULL;
+    size_t  len     = 0;
+    size_t  str_len = 0;
+
+    /*
+     * Check whether a given number is a palindrome. We're only
+     * handling numbers consisting of ASCII digits.
+     */
+    while ((str_len = getline (&line, &len, stdin)) != -1) {
+        str_len --;  /* New line */
+        bool is_palindrome = !!str_len;
+
+        /*
+         * Check wether the characters are digits, and the same
+         * when counting from the end. Of strings of uneven length,
+         * don't check the middle character just yet.
+         */
+        for (size_t i = 0; i < str_len / 2 && is_palindrome; i ++) {
+            if (line [i] < '0' || line [i] > '9' ||
+                line [i] != line [str_len - i - 1]) {
+                is_palindrome = false;
+            }
+        }
+        /*
+         * If we have an odd number of characters, check whether the middle
+         * character is a digit, or a dot -- but if it's a dot, the string
+         * should be at least two characters in length.
+         */
+        if (is_palindrome && str_len % 2) {
+            size_t mid = str_len / 2;
+            if ((line [mid]  < '0' || line [mid] > '9') && 
+                (line [mid] != '.' || str_len == 1)) {
+                is_palindrome = false;
+            }
+        }
+        printf ("%d\n", is_palindrome ? 1 : 0);
+    }
+    free (line);
+
+    return (0);
+}
diff --git a/challenge-095/abigail/t/ctest.ini b/challenge-095/abigail/t/ctest.ini
index 6e05838ac8..d725563f31 100644
--- a/challenge-095/abigail/t/ctest.ini
+++ b/challenge-095/abigail/t/ctest.ini
@@ -9,3 +9,9 @@
 
 [1-5/javascript]
 skip = No script runs assertions available
+
+[1-4/c]
+skip = No Unicode support
+
+[1-5/c]
+skip = No Unicode support
-- 
cgit