Solution | ex01-05, ex07-08

courses/cunix/ex01/Makefile

@@ -7,6 +7,8 @@ LDFLAGS		    	+= -Llib
 
 CFLAGS		    	+= -Iinclude -Wall -Wextra -Werror -g
 
+ccflags-y 			:= -std=c99
+
 SRCS				:= $(wildcard src/*.c)
 
 OBJS				:= $(SRCS:.c=.o)

courses/cunix/ex01/src/my_strlen.c

@@ -0,0 +1,28 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_strlen.c
+ *
+ *    Description: own implementation of std strel function 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 12:48:09 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+unsigned int my_strlen(char *str)
+{
+    unsigned int len = 0;
+    while (*(str++) != '\0')
+    {
+        len++;
+    }
+    return len;
+}
+/* -----  end of function my_strlen  ----- */

courses/cunix/ex02/Makefile

@@ -7,6 +7,8 @@ LDFLAGS	    		+= -Llib
 
 CFLAGS   			+= -Iinclude -Wall -Wextra -Werror -g
 
+ccflags-y 			:= -std=c99
+
 SRCS				:= $(wildcard src/*.c)
 
 OBJS				:= $(SRCS:.c=.o)

courses/cunix/ex02/src/my_strcmp.c

@@ -0,0 +1,31 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_strcmp.c
+ *
+ *    Description: std strcmp implementation 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 04:53:28 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+
+int my_strcmp(char *str1, char *str2) {
+    while (*(str1) != '\0' && *(str2) != '\0') {
+        if (*(str1) != *(str2)) {
+            return *(str1) - *(str2);
+        }
+        str1++;
+        str2++;
+    }
+
+    return *(str1) - *(str2);
+}
+/* -----  end of function my_strcmp  ----- */

courses/cunix/ex02/src/test.c

@@ -10,15 +10,15 @@ void   test_small()
   assert(my_strcmp("", "") == 0);
   assert(my_strcmp("A", "A") == 0);
   assert(my_strcmp("AB", "AB") == 0);
-  assert(my_strcmp("AB", "AC") == -1);
-  assert(my_strcmp("AB", "AA") == 1);
-  assert(my_strcmp("AB", "AD") == -1);
+  assert(my_strcmp("AB", "AC") < 0);
+  assert(my_strcmp("AB", "AA") > 0);
+  assert(my_strcmp("AB", "AD") < 0);
 }
 
 void   test_long()
 {
   assert(my_strcmp("HELLO WORLD", "HELLA WORLD") > 0);
-  assert(my_strcmp("HELLO WORLD", "HELL WORLD") == 1);
+  assert(my_strcmp("HELLO WORLD", "HELL WORLD") > 0);
 }
 
 int   main()

courses/cunix/ex03/Makefile

@@ -7,6 +7,8 @@ LDFLAGS	    		+= -Llib
 
 CFLAGS		    	+= -Iinclude -Wall -Wextra -Werror -g
 
+ccflags-y           := -std=c99
+
 SRCS				:= $(wildcard src/*.c)
 
 OBJS				:= $(SRCS:.c=.o)
@@ -27,7 +29,7 @@ fclean: 		    clean
 re: 				fclean all
 
 test:				re
-						@(./$(NAME) && echo "Test success" || echo "Test Fails")
+						@(./$(NAME) && echo "Test Successes" || echo "Test Fails")
 
 debug:              $(NAME)
 					valgrind -v --leak-check=full --track-origins=yes ./$(NAME)

courses/cunix/ex03/src/my_strcpy.c

@@ -0,0 +1,42 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_strcpy.c
+ *
+ *    Description: own std strcpy implementation 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 08:00:40 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  my_strcpy
+ *  Description: std strcpy implementation.
+ *  Note: the user must ensure that 'dest' buffer has enough space to have 'src' copied into it, otherwise undefined behavior!
+ * =====================================================================================
+ */
+
+#include <stddef.h>
+
+char *my_strcpy(char *dest, char *src)
+{
+    size_t i = 0;
+
+    while (src[i] != '\0')
+    {
+        dest[i] = src[i];
+        i++;
+    }
+
+    dest[i] = '\0';
+    return dest;
+}
+/* -----  end of function my_strcpy  ----- */

courses/cunix/ex04/Makefile

@@ -7,6 +7,8 @@ LDFLAGS			    += -Llib
 
 CFLAGS		    	+= -Iinclude -Wall -Wextra -Werror -g
 
+ccflags-y           := -std=c99
+
 SRCS				:= $(wildcard src/*.c)
 
 OBJS				:= $(SRCS:.c=.o)

courses/cunix/ex04/src/my_atoi.c

@@ -0,0 +1,57 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_atoi.c
+ *
+ *    Description:  own implementation of std atoi function 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 09:37:38 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  my_atoi
+ *  Description:  converts array of chars 'nptr' to a number up to a non-digit character. Any leading spaces are skipped, the sign char is read if present. If a string can't be parsed to a number, 0 is returned. 
+ * =====================================================================================
+ */
+int my_atoi(const char *nptr)
+{
+    int num = 0, sign = 1, i = 0;
+
+    // skip leading spaces
+    while (nptr[i] == ' ')
+    {
+        i++;
+    }
+
+    // read the sign of a number if any
+    if (nptr[i] == '-' || nptr[i] == '+')
+    {
+        if (nptr[i] == '-')
+        {
+            sign = -1;
+        }
+        i++;
+    }
+
+    // read digits one by one
+    while ('0' <= nptr[i] && nptr[i] <= '9')
+    {
+        num = num * 10 + (nptr[i] - '0');
+        i++;
+    }
+
+    num *= sign;
+
+    return num;
+}
+/* -----  end of function my_atoi  ----- */

courses/cunix/ex04/src/my_itoa.c

@@ -0,0 +1,36 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_itoa.c
+ *
+ *    Description:  own implementation of itoa function 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 10:46:17 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+#include <stdio.h>
+#include <limits.h>
+#include <stdlib.h>
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  my_itoa
+ *  Description:  converts 'nmb' to array of char 
+ * =====================================================================================
+ */
+char *my_itoa(int nmb)
+{
+    // using malloc to allocate memory from the heap
+    char *str = malloc(sizeof nmb * CHAR_BIT + 1 + 1);
+    sprintf(str, "%d", nmb);
+    return str;
+}
+/* -----  end of function my_itoa  ----- */

courses/cunix/ex05/Makefile

@@ -9,6 +9,8 @@ LDFLAGS				+= -Llib
 
 CFLAGS				+= -Iinclude -Wall -Wextra -Werror -g
 
+ccflags-y           := -std=c99
+
 SRCS				:= $(wildcard src/*.c)
 
 OBJS				:= $(SRCS:.c=.o)

courses/cunix/ex05/src/my_puts.c

@@ -0,0 +1,47 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  my_puts.c
+ *
+ *    Description:  own implementation of std puts function using only write 
+ *
+ *        Version:  1.0
+ *        Created:  08/20/2021 11:26:08 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Nikita Sazonov (ns), [email protected]
+ *        Company:  
+ *
+ * =====================================================================================
+ */
+
+#include <stdio.h>
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  my_puts
+ *  Description:  writes the string s and a trailing newline to stdout. 
+ * =====================================================================================
+ */
+int my_puts(const char *s)
+{
+    int i = 0;
+
+    while (s[i] != '\0')
+    {
+        if (putchar(s[i]) == EOF)
+        {
+            return EOF;
+        }
+        i++;
+    }
+
+    if (putchar('\n') == EOF)
+    {
+        return EOF;
+    }
+
+    return 1;
+}
+/* -----  end of function my_puts  ----- */

courses/cunix/ex07/Makefile

@@ -5,7 +5,7 @@ RM					:= rm -rf
 
 LDFLAGS				+= -Llib
 
-CFLAGS				+= -Iinclude -Wall -Wextra -Werror -g
+CFLAGS				+= -std=c99 -Iinclude -Wall -Wextra -Werror -g
 
 SRCS				:= $(wildcard src/*.c)