// SPDX-License-Identifier: GPL-2.0-or-later
//
// The bounded string builder. See include/core/sbuf.h for what it is and why it
// moved out of kernel/dev/procfs.c.

#include "core/types.h"
#include "core/sbuf.h"

void
sb_putc(struct sbuf *sb, char c)
{
  if (sb->len < sb->cap - 1)
    sb->p[sb->len++] = c;
}

void
sb_puts(struct sbuf *sb, const char *s)
{
  while (*s)
    sb_putc(sb, *s++);
}

void
sb_pad(struct sbuf *sb, const char *s, int width)
{
  int n = 0;
  while (s[n]) {
    sb_putc(sb, s[n]);
    n++;
  }
  while (n++ < width)
    sb_putc(sb, ' ');
}

void
sb_puthex4(struct sbuf *sb, uint32 v)
{
  static const char hex[] = "0123456789abcdef";
  for (int i = 3; i >= 0; i--)
    sb_putc(sb, hex[(v >> (i * 4)) & 0xF]);
}

void
sb_puthex(struct sbuf *sb, uint64 v, int digits)
{
  static const char hex[] = "0123456789abcdef";
  for (int i = digits - 1; i >= 0; i--)
    sb_putc(sb, hex[(v >> (i * 4)) & 0xF]);
}

void
sb_putu(struct sbuf *sb, uint64 v)
{
  char tmp[24];
  int  i = 0;
  if (v == 0) { sb_putc(sb, '0'); return; }
  while (v && i < (int)sizeof(tmp)) { tmp[i++] = '0' + (v % 10); v /= 10; }
  while (i--) sb_putc(sb, tmp[i]);
}

void
sb_putu_pad(struct sbuf *sb, uint64 v, int width)
{
  char tmp[24];
  int  i = 0, n;

  if (v == 0) { tmp[i++] = '0'; }
  while (v && i < (int)sizeof(tmp)) { tmp[i++] = '0' + (v % 10); v /= 10; }
  for (n = i; n < width; n++)
    sb_putc(sb, ' ');
  while (i--)
    sb_putc(sb, tmp[i]);
}

void
sb_kv(struct sbuf *sb, const char *label, uint64 v, const char *unit)
{
  sb_puts(sb, label);
  sb_putu(sb, v);
  if (unit && *unit) { sb_putc(sb, ' '); sb_puts(sb, unit); }
  sb_putc(sb, '\n');
}