Objective

Implement read_next_line, a function that reads the next text line from a file descriptor.

Steps

• Create line_reader.c and line_reader.h.
• Expose the function char *read_next_line(int fd); from the header.
• Each successful call returns a newly allocated string containing the next line from fd.
• Keep the trailing newline in the returned string when the line has one.
• As soon as a newline has been read, return that line without waiting for end of file.
• At end of file, return the remaining text if any, then return NULL on later calls.
• Return NULL on read errors, invalid descriptors, or when no more text is available.
• The grading build defines READ_CHUNK_SIZE; use it as the maximum byte count for each read call.
• Do not leave internal buffers allocated after the descriptor reaches end of file.

Objective

Implement read_next_line, a function that reads the next text line from a file descriptor.

Steps

• Create line_reader.c and line_reader.h.
• Expose the function char *read_next_line(int fd); from the header.
• Each successful call returns a newly allocated string containing the next line from fd.
• Keep the trailing newline in the returned string when the line has one.
• As soon as a newline has been read, return that line without waiting for end of file.
• At end of file, return the remaining text if any, then return NULL on later calls.
• Return NULL on read errors, invalid descriptors, or when no more text is available.
• The grading build defines READ_CHUNK_SIZE; use it as the maximum byte count for each read call.
• Do not leave internal buffers allocated after the descriptor reaches end of file.