From b3dda0980bfa04a9041327ec5aad5c1845f0620f Mon Sep 17 00:00:00 2001
From: David Phillips <dbphillipsnz@gmail.com>
Date: Mon, 26 Oct 2015 23:17:00 +1300
Subject: Initial commit

---
 .gitignore   |  2 ++
 Makefile     |  3 +++
 config.mk    |  1 +
 match_pool.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 55 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 config.mk
 create mode 100644 match_pool.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2450a3e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+match_pool
+*.o
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a0e6cb9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,3 @@
+include config.mk
+
+all: match_pool
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..e8c9b31
--- /dev/null
+++ b/config.mk
@@ -0,0 +1 @@
+CFLAGS += -Wall -Wextra -Werror
diff --git a/match_pool.c b/match_pool.c
new file mode 100644
index 0000000..6df6af8
--- /dev/null
+++ b/match_pool.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+	int i = 0;
+	char buffer[1024];
+	char *res = NULL;
+	char *pool = NULL;
+	char *local_pool = NULL;
+	size_t pool_size = 0;
+
+
+	if (argc != 2)
+	{
+		fprintf(stderr, "Usage: %s <character pool>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	pool = argv[1];
+	pool_size = strlen(pool);
+
+	local_pool = malloc(pool_size);
+	if (local_pool == NULL)
+	{
+		fprintf(stderr, "%s: malloc for local pool failed\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	while (fgets(buffer, sizeof(buffer), stdin))
+	{
+		buffer[strcspn(buffer, "\r\n")] = '\0'; /* chomp */
+
+		if (strlen(buffer) == 0)
+			continue;
+
+		strcpy(local_pool, pool);
+		for (i = strlen(buffer)-1; i >= 0; i--)
+		{
+			if ((res = memchr(local_pool, buffer[i], pool_size)) != NULL)
+				*res = '\0';
+			else
+				break;
+		}
+		printf("%s %s\n", buffer, i < 0? "matches" : "doesn't match" );
+	}
+	return 0;
+}
-- 
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