Objective

Write a program that copies standard input to standard output while masking a chosen byte sequence.

Steps

• The program expects exactly one non-empty argument: the token to mask.
• Read all data from standard input until end of file.
• Every non-overlapping occurrence of the token must be replaced by the same number of * characters.
• All other bytes must be written unchanged, including spaces and newlines.
• If a read or allocation error happens, write an error message to standard error and return 1.
• If the argument count is wrong or the token is empty, return 1.

Objective

Write a program that copies standard input to standard output while masking a chosen byte sequence.

Steps

• The program expects exactly one non-empty argument: the token to mask.
• Read all data from standard input until end of file.
• Every non-overlapping occurrence of the token must be replaced by the same number of * characters.
• All other bytes must be written unchanged, including spaces and newlines.
• If a read or allocation error happens, write an error message to standard error and return 1.
• If the argument count is wrong or the token is empty, return 1.