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char buf[BUFSIZ + 1];
char *p;

if (fgets(buf, sizeof(buf), fp)) {
  p = strchr(buf, '\n');
  if (p) {
    *p = '\0';
  }
}
else {
  /* handle error condition */
}

An obvious alternative is to leave room in the buffer for one more character, and when no newline is transferred, append a newline followed by a null-termination character. This approach is unsafe, because it quietly accepts an input that is not what was actually intended, with unknown consequences.

Risk Assessment

Assuming a newline character is read can result in data truncation.

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