src/ft_substr.c


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#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);
}