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Adding C-Strings

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This commit is contained in:
Syxpi
2026-06-12 08:51:03 +02:00
commit e92a880178
8 changed files with 547 additions and 0 deletions
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ex0/ft_strcpy.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strcpy.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 12:24:04 by lclerel- #+# #+# */
/* Updated: 2026/03/24 18:38:10 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
char *ft_strcpy(char *dest, char *src)
{
int i;
i = 0;
while (src[i] != '\0')
{
dest[i] = src[i];
i++;
}
dest[i] = '\0';
return (dest);
}
/*
int main(void)
{
char src[] = "Salut, je suis Lumi :3";
char dst[20];
int i = 0;
ft_strcpy(dst, src);
while (dst[i])
{
write(1, &dst[i], 1);
i++;
}
write(1, "\n", 1);
return (0);
}*/
ex1/ft_strncpy.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strncpy.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@learner.42.tech> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 12:35:37 by lclerel- #+# #+# */
/* Updated: 2026/03/24 12:55:02 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
char *ft_strncpy(char *dest, char *src, unsigned int n)
{
unsigned int i;
i = 0;
while (src[i] != '\0' && i < n)
{
dest[i] = src[i];
i++;
}
while (i < n)
{
dest[i] = '\0';
i++;
}
return (dest);
}
/*
int main(void)
{
unsigned int size = 30;
char src[] = "Salut, je suis Lumi :3";
char dst[30] = {0};
int i = 0;
ft_strncpy(dst, src, size);
while (dst[i])
{
write(1, &dst[i], 1);
i++;
}
write(1, "\n", 1);
return (0);
}*/
ex2/ft_strcmp.c
+84
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strcmp.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 13:44:05 by lclerel- #+# #+# */
/* Updated: 2026/03/25 22:46:26 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
int ft_strcmp(char *s1, char *s2)
{
int i;
i = 0;
while ((s1[i] || s2[i]) && s1[i] == s2[i])
i++;
return ((unsigned char)s1[i] - (unsigned char)s2[i]);
}
/*void ft_putchar(char chara)
{
write(1, &chara, 1);
}
void ft_putstr(char *str)
{
int i;
i = 0;
while (str[i])
{
ft_putchar(str[i]);
i++;
}
}
int main(void)
{
char *s1 = "Lumi";
char *s2 = "Lumi";
char *s3 = "LumX";
char *rdmvar = "Pasteque";
char *nullvar = "NULL";
// Test 1
write(1, "Test avec s1 (", 14);
ft_putstr(s1);
write(1, ") et s2 (", 9);
ft_putstr(s2);
write(1, ") : \n", 5);
if (ft_strcmp(s1, s2) == 0)
write(1, "Test 1 : OK :3", 14);
else
write(1, "Test 1 : Not OK :(", 18);
ft_putchar('\n');
// Test 2
write(1, "Test avec s1 (", 14);
ft_putstr(s1);
write(1, ") et s3 (", 9);
ft_putstr(s3);
write(1, ") : \n", 5);
if (ft_strcmp(s1, s3) == 0)
write(1, "Test 2 : OK :3", 14);
else
write(1, "Test 2 : Not OK :(", 18);
ft_putchar('\n');
// Test 3
write(1, "Test avec NULLVAR (", 19);
ft_putstr(nullvar);
write(1, ") et rdmvar (", 13);
ft_putstr(rdmvar);
write(1, ") : \n", 5);
if (ft_strcmp(nullvar, rdmvar) == 0)
write(1, "Test 3 : OK :3", 14);
else
write(1, "Test 3 : Not OK :(", 18);
ft_putchar('\n');
return (0);
}
*/
ex3/ft_strncmp.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strncmp.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 13:44:05 by lclerel- #+# #+# */
/* Updated: 2026/03/25 22:46:55 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
int ft_strncmp(char *s1, char *s2, unsigned int n)
{
unsigned int i;
i = 0;
if (n == 0)
return (0);
while ((s1[i] || s2[i]) && s1[i] == s2[i] && i < n - 1)
i++;
return ((unsigned char)s1[i] - (unsigned char)s2[i]);
}
/*
void ft_putnbr(int nb)
{
char value;
if (nb == -2147483648)
{
write(1, "-2147483648", 11);
return ;
}
if (nb < 0)
{
write(1, "-", 1);
nb = -nb;
}
if (nb > 9)
{
ft_putnbr(nb / 10);
}
value = nb % 10 + '0';
write(1, &value, 1);
}
void ft_putchar(char chara)
{
write(1, &chara, 1);
}
void ft_putstr(char *str)
{
int i;
i = 0;
while (str[i])
{
ft_putchar(str[i]);
i++;
}
}
int main(void)
{
char *s1 = "Lumiere";
char *s2 = "Luminescense";
char *s3 = "Lumi";
char *rdmvar = "Pasteque";
char *nullvar = "NULL";
int val;
// Test 1
val = 4;
write(1, "Test avec s1 (", 14);
ft_putstr(s1);
write(1, ") et s2 (", 9);
ft_putstr(s2);
write(1, ") de valeur ", 13);
ft_putnbr(val);
write(1, ": \n", 3);
if (ft_strncmp(s1, s2, val) == 0)
write(1, "Test 1 : OK :3", 14);
else
write(1, "Test 1 : Not OK :(", 18);
ft_putchar('\n');
// Test 2
val = 5;
write(1, "Test avec s1 (", 14);
ft_putstr(s1);
write(1, ") et s2 (", 9);
ft_putstr(s2);
write(1, ") de valeur ", 13);
ft_putnbr(val);
write(1, ": \n", 3);
if (ft_strncmp(s1, s2, val) == 0)
write(1, "Test 2 : OK :3", 14);
else
write(1, "Test 2 : Not OK :(", 18);
ft_putchar('\n');
// Test 3
val = 3;
write(1, "Test avec s1 (", 14);
ft_putstr(s1);
write(1, ") et s3 (", 9);
ft_putstr(s3);
write(1, ") de valeur ", 13);
ft_putnbr(val);
write(1, ": \n", 3);
if (ft_strncmp(nullvar, rdmvar, val) == 0)
write(1, "Test 3 : OK :3", 14);
else
write(1, "Test 3 : Not OK :(", 18);
ft_putchar('\n');
// Test 4
val = 3;
write(1, "Test avec NULLVAR (", 19);
ft_putstr(nullvar);
write(1, ") et rdmvar (", 13);
ft_putstr(rdmvar);
write(1, ") de valeur ", 13);
ft_putnbr(val);
write(1, ": \n", 3);
if (ft_strncmp(nullvar, rdmvar, val) == 0)
write(1, "Test 4 : OK :3", 14);
else
write(1, "Test 4 : Not OK :(", 18);
ft_putchar('\n');
return (0);
}*/
ex4/ft_strcat.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strcat.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@learner.42.tech> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 17:44:18 by lclerel- #+# #+# */
/* Updated: 2026/03/24 18:04:08 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
char *ft_strcat(char *dest, char *src)
{
unsigned int i;
unsigned int j;
i = 0;
j = 0;
while (dest[i])
i++;
while (src[j])
{
dest[i + j] = src[j];
j++;
}
dest[i + j] = '\0';
return (dest);
}
/*
int main(void)
{
char dst[25] = "Salut :3 ";
char src[] = "Je suis Lumi ^w^";
ft_strcat(dst, src);
write(1, dst, 25);
}*/
ex5/ft_strncat.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strncat.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@learner.42.tech> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 18:04:58 by lclerel- #+# #+# */
/* Updated: 2026/03/24 18:39:31 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
char *ft_strncat(char *dest, char *src, unsigned int nb)
{
unsigned int i;
unsigned int j;
i = 0;
j = 0;
while (dest[i])
i++;
while (src[j] && j < nb)
{
dest[i + j] = src[j];
j++;
}
dest[i + j] = '\0';
return (dest);
}
/*
int main(void)
{
char dst[100] = "Salut :3 ";
char src[] = "Je suis Lumi ^w^";
unsigned int nb = 26;
ft_strncat(dst, src, nb);
write(1, dst, 25);
}*/
ex6/ft_strstr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strstr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@learner.42.tech> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 18:09:44 by lclerel- #+# #+# */
/* Updated: 2026/03/25 11:15:55 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
char *ft_strstr(char *str, char *to_find)
{
int i;
int j;
i = 0;
if (to_find[0] == '\0')
return (str);
while (str[i])
{
j = 0;
while (str[i + j] == to_find[j] && to_find[j])
j++;
if (to_find[j] == '\0')
return (&str[i]);
i++;
}
return (0);
}
/*int main(void)
{
char *st = "JVE!5toU6Bnd1Dn8zBs2h3kLM9Fkeo=;Cj>=THqcN;5iJS5$JKw3E4iJuc";
char *find = "j>=THqcN;5";
char *res;
res = ft_strstr(st, find);
if (res)
{
write(1, "J'ai un truc ! C'est SA : ", 26);
write(1, res, 16);
write(1, "\n", 1);
}
else
{
write(1, "Y'as rien dans ton tas de merde Lumi.\n", 38);
}
return (0);
}*/
ex7/ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lclerel- <lclerel-@learner.42.tech> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2026/03/24 12:58:12 by lclerel- #+# #+# */
/* Updated: 2026/03/24 13:23:45 by lclerel- ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
int ft_atoi(char *str)
{
int i;
int sign;
int res;
res = 0;
i = 0;
sign = 1;
while (str[i] == ' ' || (str[i] >= 9 && str[i] <= 13))
i++;
while (str[i] == '-' || str[i] == '+')
{
if (str[i] == '-')
sign *= -1;
i++;
}
while (str[i] >= '0' && str[i] <= '9')
{
res = (res * 10) + (str[i] - '0');
i++;
}
return (res * sign);
}
/*
void ft_putnbr(int nb)
{
char value;
if (nb == -2147483648)
{
write(1, "-2147483648", 11);
return ;
}
if (nb < 0)
{
write(1, "-", 1);
nb = -nb;
}
if (nb > 9)
{
ft_putnbr(nb / 10);
}
value = nb % 10 + '0';
write(1, &value, 1);
}
int main(void)
{
int res;
// Test 1
write(1, "/~~~Test 1~~~\\\n", 15);
write(1, "> Test avec -------+-----101010 : <\n", 36);
res = ft_atoi(" -------+-----101010");
if (res == -101010)
write(1, "> OK. :3 <\n", 11);
else
write(1, "> Not OK :( <\n", 14);
write(1, "> Resultat retourner : ", 23);
ft_putnbr(res);
write(1, " <\n\\~~~Test 1~~~/\n\n", 18);
// Fin Test 1
write(1, "\n", 1);
// Test 2
write(1, "/~~~Test 2~~~\\\n", 15);
write(1, "> Test avec NULL : <\n", 21);
res = ft_atoi("NULL");
if (res == 1)
write(1, "> OK. :3 <\n", 11);
else
write(1, "> Not OK :( <\n", 14);
write(1, "> Resultat retourner : ", 23);
ft_putnbr(res);
write(1, " <\n\\~~~Test 2~~~/\n", 18);
// Fin Test 2
write(1, "\n", 1);
// Test 3
write(1, "/~~~Test 3~~~\\\n", 15);
write(1, "> Test avec 213d6516 : <\n", 25);
res = ft_atoi("213d6516");
if (res == 213)
write(1, "> OK. :3 <\n", 11);
else
write(1, "> Not OK :( <\n", 14);
write(1, "> Resultat retourner : ", 23);
ft_putnbr(res);
write(1, " <\n\\~~~Test 3~~~/\n", 18);
// Fin Test 3
return (0);
}*/