s21_string+

This project is an implementation of the C string.h library, with additional functionality including sprintf and sscanf. This project was completed as part of the School 21 curriculum.

Table of Contents

• s21_string.h
• s21_sprintf.h
• s21_sscanf.h
• Bonus Functions
• Building and Testing

s21_string.h

This library provides a custom implementation of the standard C string.h library.

Functions

Function	Description
s21_memchr	Searches for the first occurrence of a character in a block of memory.
s21_memcmp	Compares two blocks of memory.
s21_memcpy	Copies a block of memory.
s21_memset	Fills a block of memory with a specific value.
s21_strncat	Appends a specified number of characters from one string to another.
s21_strchr	Finds the first occurrence of a character in a string.
s21_strncmp	Compares a specified number of characters of two strings.
s21_strncpy	Copies a specified number of characters from one string to another.
s21_strcspn	Calculates the length of the initial segment of a string which consists entirely of characters not in another string.
s21_strerror	Returns a pointer to an error message string.
s21_strlen	Calculates the length of a string.
s21_strpbrk	Finds the first character in a string that matches any character in another string.
s21_strrchr	Finds the last occurrence of a character in a string.
s21_strstr	Finds the first occurrence of a substring in a string.
s21_strtok	Breaks a string into a series of tokens.

s21_sprintf.h

This library provides a custom implementation of the sprintf function.

Supported Specifiers

Specifier	Description
c	Character
d, i	Signed decimal integer
f	Decimal floating point
s	String of characters
u	Unsigned decimal integer
%	Character %
g, G	Uses the shortest representation of decimal floating point
e, E	Scientific notation
x, X	Unsigned hexadecimal integer
o	Unsigned octal
p	Pointer address

Supported Flags

Flag	Description
-	Left-justify
+	Force sign
	Space before positive numbers
#	Alternative form
0	Zero-padding

Supported Width and Precision

• (number): Minimum number of characters to be printed.
• *: Width is specified by an argument.
• .(number): Minimum number of digits to be written.
• .*: Precision is specified by an argument.

Supported Length Modifiers

Modifier	Description
h	short int
l	long int
L	long double

s21_sscanf.h

This library provides a custom implementation of the sscanf function.

Supported Specifiers

Specifier	Description
c	Character
d	Signed decimal integer
i	Signed integer (decimal, octal, or hexadecimal)
e, E, f, g, G	Decimal floating point or scientific notation
o	Unsigned octal
s	String of characters
u	Unsigned decimal integer
x, X	Unsigned hexadecimal integer
p	Pointer address
n	Number of characters scanned
%	Character %

Bonus Functions

This project also includes a few bonus functions inspired by C# string manipulation methods:

Function	Description
s21_to_upper	Converts a string to uppercase.
s21_to_lower	Converts a string to lowercase.
s21_insert	Inserts a string into another string at a specified index.
s21_trim	Removes leading and trailing occurrences of a set of characters from a string.

Credits

This project was a collaborative effort completed at School 21.

Authors:

• brutalsam96
• yunusov02

Building and Testing

To build the library and run the tests, you can use the provided Makefile.

Targets

• all: Builds the s21_string.a library.
• clean: Removes all build artifacts.
• test: Builds and runs the unit tests.
• gcov_report: Generates a code coverage report using gcov.

Example Usage

# Build the library
make all

# Run the tests
make test

# Generate a coverage report
make gcov_report