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ft_strmap.c
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ft_strmap.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strmap.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: pbie <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2015/11/27 18:40:57 by pbie #+# #+# */
/* Updated: 2015/12/02 23:47:13 by pbie ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
/*This functin applies the given function f to each character of the given
* string in order to create a new string that is the result of have function
* f run on string s. It will return a 'fresh' copy of the modified string*/
char *ft_strmap(char const *s, char (*f)(char))
{
/*We start by creating two variable. An unsigned int counter to move us
* through our string and char variable for our string that is to be
* returned.*/
unsigned int i;
char *str;
/*Next we allocate the memory necessary to make a copy of the modified
* string we want to return. We use our ft_strlen function on the given
* string and make sure to add 1 to it to compensate for the terminating
* '\0'. If the allocation fails we return NULL. Otherwise we continue.*/
i = 0;
str = (char *)malloc(sizeof(char) * (ft_strlen(s)) + 1);
if (str == NULL)
return (NULL);
/*We now go through our string s and apply the function f to each of it's
* characters. We set the result of this into the corresponding position in
* our empty string. Once we reach the end of our parameter string we exit
* the loop and make sure to add a terminating '\0' to the end of our newly
* filled string. We then return our new string.*/
while (s[i] != '\0')
{
str[i] = f(s[i]);
i++;
}
str[i] = '\0';
return (str);
}