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The analog to gets for reading a line directly from a file is
fgets, an acronym for file get string:
fgets(name of character array,
maximum characters to be read + 1,
file-pointer name)
Like gets, the fgets function generally returns a pointer to
the first character in the character array, but should the fgets
function encounter the end of a file, it returns NULL. Unlike
gets, fgets stops when it either reaches the end of a line or
has read the maximum number of characters. If fgets does reach the
end of a line, fgets copies an end-of-line character into the array,
just before the terminating \0, which appears in the character array
no matter what.
Thus, you can read the next line of input from a file into the
input_buffer array with the following statement:
*-- You do not want more characters than
| input_buffer can hold
v
fgets(input_buffer, 100, trade_source);
^
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*-- A file pointer, set up by FILE*