Initial commit: libft Part 1 with tests and documentation

Reimplements 24 libc functions with Doxygen-documented header
and test suite comparing against libc.

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/test_atoi.c b/tests/test_atoi.c
new file mode 100644
index 0000000..196a081
--- /dev/null
+++ b/tests/test_atoi.c
@@ -0,0 +1,58 @@
+#include "../libft.h"
+#include "test_utils.h"
+#include <limits.h>
+
+static void
+_s_ft_atoi_null (void)
+{
+  _s_sink_i = ft_atoi (NULL);
+}
+static void
+_s_libc_atoi_null (void)
+{
+  _s_sink_i = atoi (NULL);
+}
+
+int
+main (void)
+{
+  int i;
+  char buf[64];
+  char label[64];
+
+  printf ("=== ft_atoi ===\n");
+
+  /* NULL */
+  _s_check_both_crash ("atoi NULL", _s_ft_atoi_null, _s_libc_atoi_null);
+
+  /* edge cases */
+  _s_check_eq_int ("zero", ft_atoi ("0"), atoi ("0"));
+  _s_check_eq_int ("INT_MAX", ft_atoi ("2147483647"), atoi ("2147483647"));
+  _s_check_eq_int ("INT_MIN", ft_atoi ("-2147483648"), atoi ("-2147483648"));
+  _s_check_eq_int ("negative", ft_atoi ("-42"), atoi ("-42"));
+  _s_check_eq_int ("explicit +", ft_atoi ("+42"), atoi ("+42"));
+  _s_check_eq_int ("leading spaces", ft_atoi ("   42"), atoi ("   42"));
+  _s_check_eq_int ("leading tabs", ft_atoi ("\t\n\v\f\r 42"),
+                   atoi ("\t\n\v\f\r 42"));
+  _s_check_eq_int ("trailing chars", ft_atoi ("42abc"), atoi ("42abc"));
+  _s_check_eq_int ("empty string", ft_atoi (""), atoi (""));
+  _s_check_eq_int ("only spaces", ft_atoi ("   "), atoi ("   "));
+  _s_check_eq_int ("only sign", ft_atoi ("-"), atoi ("-"));
+  _s_check_eq_int ("sign then space", ft_atoi ("- 42"), atoi ("- 42"));
+  _s_check_eq_int ("double sign", ft_atoi ("--42"), atoi ("--42"));
+  _s_check_eq_int ("space between", ft_atoi ("4 2"), atoi ("4 2"));
+  _s_check_eq_int ("leading zeros", ft_atoi ("00042"), atoi ("00042"));
+
+  /* randomized */
+  srand (time (NULL));
+  for (i = 0; i < 50; i++)
+    {
+      int v = rand () - RAND_MAX / 2;
+      snprintf (buf, sizeof (buf), "%d", v);
+      snprintf (label, sizeof (label), "random %s", buf);
+      _s_check_eq_int (label, ft_atoi (buf), atoi (buf));
+    }
+
+  _s_print_results ();
+  return (_s_fail != 0);
+}