C open() sycall returns -1 for a variable path parameter

Question

Trying to open a file using open(). Returns the correct file descriptor when we call it like so:

fd = open("a.txt", O_RDONLY);

But when we use a token generated from strtok(), it returns -1:

token = strtok(NULL, " ");
fd = open(token, O_RDONLY);

Answer 1

在注释中正确猜出了： token实际上不是与"a.txt"相同的字符串，但末尾包含额外的空格，这使得在打印为字符串时很难看清。