feat: initial version

srcs/ft_atoi.c

@@ -0,0 +1,29 @@
+#include "libft.h"
+
+int ft_atoi(const char *str)
+{
+    int i = 0;
+    int r = 0;
+    int s = 1;
+
+    while (str[i] == ' ' || (str[i] >= '\t' && str[i] <= '\r'))
+        i++;
+
+    if (str[i] == '-')
+    {
+        s = -1;
+        i++;
+    }
+    else if (str[i] == '+')
+        i++;
+    
+    while(str[i] != '\0')
+    {
+        if (str[i] >= '0' && str[i] <= '9')
+            r = r * 10 + str[i] - '0';
+        else
+            break;
+        i++;
+    }
+    return (s * r);
+}

srcs/ft_bzero.c

@@ -0,0 +1,6 @@
+#include "libft.h"
+
+void ft_bzero(void *s, size_t n)
+{
+    ft_memset(s, '\0', n);
+}

srcs/ft_isalpha.c

@@ -0,0 +1,7 @@
+int ft_isalpha(int c)
+{
+    if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
+        return (1);
+    else
+        return (0);
+}

srcs/ft_isdigit.c

@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int ft_isdigit(int c)
+{
+    if (c >= '0' && c <= '9')
+        return (1);
+    return (0);
+}

srcs/ft_islower.c

@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int ft_islower(int c)
+{
+    if (c >= 'a' && c <= 'z')
+        return (1);
+    return (0);
+}

srcs/ft_isupper.c

@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int ft_isupper(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+        return (1);
+    return (0);
+}

srcs/ft_memcpy.c

@@ -0,0 +1,12 @@
+#include <stddef.h>
+
+void *ft_memcpy(void *dst, const void *src, size_t n) {
+    unsigned char *d = (unsigned char *)dst;
+    const unsigned char *s = (const unsigned char *)src;
+
+    while (n--) {
+        *d++ = *s++;
+    }
+
+    return dst;
+}

srcs/ft_memcpy32.c

@@ -0,0 +1,25 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void *ft_memcpy32(void *dst, const void *src, size_t n) {
+    size_t i;
+    uint32_t *lp_dst;
+    const uint32_t *lp_src;
+    unsigned char *bp_dst;
+    const unsigned char *bp_src;
+
+    lp_dst = (uint32_t *)dst;
+    lp_src = (const uint32_t *)src;
+
+    for (i = 0; i < n / 4; i++) {
+        lp_dst[i] = lp_src[i];
+    }
+
+    bp_dst = (unsigned char *)(lp_dst + i);
+    bp_src = (const unsigned char *)(lp_src + i);
+    for (i = 0; i < n % 4; i++) {
+        bp_dst[i] = bp_src[i];
+    }
+
+    return dst;
+}

srcs/ft_memcpy64.c

@@ -0,0 +1,25 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void *ft_memcpy64(void *dst, const void *src, size_t n) {
+    size_t i;
+    uint64_t *lp_dst;
+    const uint64_t *lp_src;
+    unsigned char *bp_dst;
+    const unsigned char *bp_src;
+
+    lp_dst = (uint64_t *)dst;
+    lp_src = (const uint64_t *)src;
+
+    for (i = 0; i < n / 8; i++) {
+        lp_dst[i] = lp_src[i];
+    }
+
+    bp_dst = (unsigned char *)(lp_dst + i);
+    bp_src = (const unsigned char *)(lp_src + i);
+    for (i = 0; i < n % 8; i++) {
+        bp_dst[i] = bp_src[i];
+    }
+
+    return dst;
+}

srcs/ft_memset.c

@@ -0,0 +1,9 @@
+#include "libft.h"
+
+void *ft_memset(void *s, int c, size_t n)
+{
+	unsigned char *p = (unsigned char *)s;
+	while (n--)
+		*p++ = (unsigned char)c;
+	return s;
+}

srcs/ft_memset32.c

@@ -0,0 +1,37 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void *ft_memset32(void *s, int c, size_t n)
+{
+    unsigned char   *ptr = (unsigned char *)s;
+    uint32_t        pattern;
+    uint32_t        *long_ptr;
+
+    unsigned char byte = (unsigned char)c;
+
+    while (n > 0 && ((uintptr_t)ptr % 4 != 0))
+    {
+        *ptr++ = byte;
+        n--;
+    }
+
+    if (n >= 4)
+    {
+        pattern = byte;
+        pattern |= pattern << 8;
+        pattern |= pattern << 16;
+
+        long_ptr = (uint32_t *)ptr;
+        while (n >= 4)
+        {
+            *long_ptr++ = pattern;
+            n -= 4;
+        }
+        ptr = (unsigned char *)long_ptr;
+    }
+
+    while (n--)
+        *ptr++ = byte;
+
+    return s;
+}

srcs/ft_memset64.c

@@ -0,0 +1,38 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void *ft_memset64(void *s, int c, size_t n)
+{
+	unsigned char   *ptr = (unsigned char *)s;
+	uint64_t        pattern;
+	uint64_t        *long_ptr;
+
+	unsigned char byte = (unsigned char)c;
+
+	while (n > 0 && ((uintptr_t)ptr % 8 != 0))
+	{
+		*ptr++ = byte;
+		n--;
+	}
+
+	if (n >= 8)
+	{
+		pattern = byte;
+		pattern |= pattern << 8;
+		pattern |= pattern << 16;
+		pattern |= pattern << 32;
+
+		long_ptr = (uint64_t *)ptr;
+		while (n >= 8)
+		{
+			*long_ptr++ = pattern;
+			n -= 8;
+		}
+		ptr = (unsigned char *)long_ptr;
+	}
+
+	while (n--)
+		*ptr++ = byte;
+
+	return s;
+}

srcs/ft_strlen.c

@@ -0,0 +1,14 @@
+#include <stddef.h>
+
+size_t ft_strlen(const char *s)
+{
+    const char *p = s;
+
+    if (!s)
+        return 0;
+
+    while (*p)
+        ++p;
+
+    return (size_t)(p - s);
+}

srcs/ft_tolower.c

@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int ft_tolower(int c)
+{
+    if (ft_isupper(c))
+        c = c + 32;
+    return (c);
+}

srcs/ft_toupper.c

@@ -0,0 +1,8 @@
+#include "libft.h"
+
+int ft_toupper(int c)
+{
+    if (ft_islower(c))
+        c = c - 32;
+    return (c);
+}