/*  input.c
 *
 *  Various input routines
 *
 *  written by vx-clutch
 */

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "input.h"

char *getstring(char *fmt, ...) {
  va_list args;
  va_start(args, fmt);

  printf("? ");
  vprintf(fmt, args);
  putc(' ', stdout);

  va_end(args);
  fflush(stdout);

  char *buf = NULL;
  size_t size = 0;
  ssize_t len = getline(&buf, &size, stdin);

  if (len < 0) {
    free(buf);
    return NULL;
  }

  if (len > 0 && buf[len - 1] == '\n')
    buf[len - 1] = '\0';

  return buf;
}

int yes_no_prompt(const char *fmt, ...) {
  char prompt[256];

  va_list ap;
  va_start(ap, fmt);
  vsnprintf(prompt, sizeof prompt, fmt, ap);
  va_end(ap);

  char buf[64];
  for (;;) {
    fprintf(stderr, "? %s", prompt);
    fputs(" (y/n) ", stdout);
    fflush(stdout);

    if (!fgets(buf, sizeof buf, stdin))
      return 0;

    size_t i = 0;
    while (buf[i] && isspace((unsigned char)buf[i]))
      i++;
    if (!buf[i])
      continue;

    char c = tolower((unsigned char)buf[i]);
    if (c == 'y')
      return 1;
    if (c == 'n')
      return 0;
  }
}