diff options
Diffstat (limited to 'src/str/ft_strsub.c')
| -rw-r--r-- | src/str/ft_strsub.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/str/ft_strsub.c b/src/str/ft_strsub.c new file mode 100644 index 0000000..c7121bd --- /dev/null +++ b/src/str/ft_strsub.c @@ -0,0 +1,41 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* ft_strsub.c :+: :+: :+: */ +/* +:+ +:+ +:+ */ +/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ +/* +#+#+#+#+#+ +#+ */ +/* Created: 2019/10/17 08:28:49 by cacharle #+# #+# */ +/* Updated: 2020/05/09 12:30:39 by charles ### ########.fr */ +/* */ +/* ************************************************************************** */ + +#include "libft_str.h" + +/* +** \brief Extract a substring from a string +** \param s String to extract from +** \param start Starting index of the substring +** \param len Substring length +** \return The created substring or NULL on error +*/ + +char *ft_strsub(char const *s, size_t start, size_t len) +{ + char *sub; + size_t s_len; + + if (s == NULL) + return (NULL); + s_len = ft_strlen(s); + if (start > s_len) + return (NULL); + if (start + len > s_len) + len = s_len - start; + if ((sub = (char*)malloc(sizeof(char) * (len + 1))) == NULL) + return (NULL); + sub[len] = '\0'; + if (start > ft_strlen(s)) + return (sub); + return (ft_strncpy(sub, s + start, len)); +} |