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char buf[BUFSIZBUFFERSIZE];
int ch;
char *p;

if (fgets(buf, sizeof(buf), stdin)) {
  /* fgets succeeds, scan for newline character */
  p = strchr(buf, '\n');
  if (p) {
    *p = '\0';
  }
  else {
    /* newline not found, flush stdin to end of line */
    while (((ch = getchar()) != '\n')
          && !feof(stdin)
          && !ferror(stdin)
    );
  }
}
else {
  /* fgets failed, handle error */
}

char buf[BUFSIZBUFFERSIZE];

if (gets_s(buf, sizeof(buf)) == NULL) {
  /* handle error */
}