From ce95e8cc84f9fddda0a02d14ae9ec4cf3759bb21 Mon Sep 17 00:00:00 2001
From: Bruce Cowan <bruce@bcowan.me.uk>
Date: Sat, 13 Oct 2018 20:18:36 +0100
Subject: [PATCH] Add insane number reading through getchar
---
getchar.c | 27 +++++++++++++++++++++++++++
meson.build | 1 +
2 files changed, 28 insertions(+)
create mode 100644 getchar.c
diff --git a/getchar.c b/getchar.c
new file mode 100644
index 0000000..86e49d9
--- /dev/null
+++ b/getchar.c
@@ -0,0 +1,27 @@
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define LEN_DIGITS 18 // Safe digits of INT64_MAX
+
+int
+main (void)
+{
+ int64_t value = 0;
+
+ printf ("Put the number in: ");
+
+ for (int i = 0; i < LEN_DIGITS; i++)
+ {
+ int ch;
+ if ((ch = getchar ()) == '\n')
+ break;
+
+ int digit = ch - '0';
+ value = 10 * value + digit;
+ }
+
+ printf ("Value is %" PRId64 "\n", value);
+
+ return 0;
+}
diff --git a/meson.build b/meson.build
index 27dd1dc..a63ac74 100644
--- a/meson.build
+++ b/meson.build
@@ -18,6 +18,7 @@ executable('fib', 'fib.c')
executable('fixed-sizeof', 'fixed-sizeof.c')
executable('fgets', 'fgets.c')
executable('gcd', 'gcd.c')
+executable('getchar', 'getchar.c')
executable('kepler', 'kepler.c', dependencies: libm)
executable('next', 'next.c', dependencies: libm)
executable('parrot', 'parrot.c')
--
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