Get Next Line

This project implements a get_next_line function in C that reads a single line from a file descriptor each time it is called, supporting sequential calls to read through a file or standard input line-by-line. This function replicates certain functionalities of the getline function in standard libraries but adheres to specific project requirements and constraints.

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Features

• Single Line Retrieval: The get_next_line function retrieves one line at a time from a specified file descriptor, including the newline character (\n) if present. If the end of the file is reached without a newline, it returns the remaining content.
• Memory Management: Efficient memory usage is emphasized, and memory leaks are disallowed. All dynamically allocated memory must be freed appropriately.
• Modifiable Buffer Size: The buffer size for each read operation is defined by the BUFFER_SIZE macro, which can be set at compile time (e.g., -D BUFFER_SIZE=42).
• Standard Input Compatibility: The function is compatible with standard input, making it flexible for various input sources.

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Project Requirements

• Programming Language: C
• Standards Compliance: Code must adhere to the project’s Norm (specific style and formatting rules).
• Error Handling: The function should handle unexpected errors, such as segmentation faults or memory errors, excluding undefined behaviors.
• Memory Leaks: All heap-allocated memory must be properly freed to prevent leaks.
• Compilation Requirements:
  • A Makefile should be provided with targets all, clean, fclean, re, and bonus.
  • Compilation flags: -Wall -Wextra -Werror
  • The function must work with various BUFFER_SIZE values, including extremely small or large sizes.

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Implementation Notes

• Static Variables: Static variables are encouraged to help retain data across function calls without using global variables, which are disallowed.
• Helper Functions: Helper functions are organized in get_next_line_utils.c to streamline code structure.
• Undefined Behaviors: The function behavior is undefined if:
  • The file content changes after a previous call to get_next_line.
  • A binary file is read.
• Efficiency Considerations: The function should read only as much data as necessary to return one line at a time. It should avoid reading the entire file at once.

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Forbidden

• No Libft Usage: This project should not utilize functions from the Libft library.
• No lseek(): The use of lseek() is prohibited.
• No Global Variables: Global variables are not allowed; static variables are suggested as an alternative.

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Usage

Compile the project with a specified buffer size (example with buffer size 42):

cc -Wall -Wextra -Werror -D BUFFER_SIZE=42 get_next_line.c get_next_line_utils.c -o get_next_line