#include <stdio.h>
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) < (b) ? (b) : (a))
const char *f(int current, int size, int width) {
  static char buff[256], *p;
  int b = min(max(1, current - width / 2), size - width + 1), e = b + width, i;
  for (p = buff, i = b; i < e; i++) {
    if (b < i) *p++ = ' ';
    p += sprintf(p, i == current ? "[%d]" : "%d", i);
  }
  return buff;
}
int main() {
#define g(a, b, c) printf("%s\n", f(a, b, c))
  g(1,10,5), g(5, 10, 5), g(10, 10, 5);
  return 0;
}
 

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