Implement libft Part 2 with tests

Add ft_substr, ft_strjoin, ft_strtrim, ft_split, ft_itoa,
ft_strmapi, ft_striteri, ft_putchar_fd, ft_putstr_fd,
ft_putendl_fd, ft_putnbr_fd.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/ft_substr.c b/src/ft_substr.c
new file mode 100644
index 0000000..0db72d0
--- /dev/null
+++ b/src/ft_substr.c
@@ -0,0 +1,23 @@
+#include "libft.h"
+#include <stdlib.h>
+
+char *
+ft_substr (char const *s, unsigned int start, size_t len)
+{
+  size_t slen;
+  size_t actual;
+  char *sub;
+
+  slen = ft_strlen (s);
+  if (start >= slen)
+    return (ft_strdup (""));
+  actual = slen - start;
+  if (actual > len)
+    actual = len;
+  sub = malloc (actual + 1);
+  if (!sub)
+    return (NULL);
+  ft_memcpy (sub, s + start, actual);
+  sub[actual] = '\0';
+  return (sub);
+}