bytes.h

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#ifndef UTIL_BYTES_H
#define UTIL_BYTES_H
 
#include "common/bytes/span/span.h"
#include "common/platform/sys/syscall.h"


static inline int bytes_put(wired_mspan buf, usz* off, wired_span src) {
  if (*off + src.n > buf.n) return 0;
  for (usz i = 0; i < src.n; i++) buf.p[*off + i] = src.p[i];
  *off += src.n;
  return 1;
}

static inline int bytes_take(wired_span buf, usz* off, wired_mspan dst) {
  if (*off + dst.n > buf.n) return 0;
  for (usz i = 0; i < dst.n; i++) dst.p[i] = buf.p[*off + i];
  *off += dst.n;
  return 1;
}

static inline void* bytes_memcpy(void* dst, const void* src, usz n) {
  u8*       d = dst;
  const u8* s = src;
  for (usz i = 0; i < n; i++) d[i] = s[i];
  return dst;
}

static inline void* bytes_move_down(void* dst, const void* src, usz n) {
  u8*       d = dst;
  const u8* s = src;
  for (usz i = 0; i < n; i++) d[i] = s[i];
  return dst;
}

static inline void* bytes_memset(void* dst, int c, usz n) {
  u8* d = dst;
  for (usz i = 0; i < n; i++) d[i] = (u8)c;
  return dst;
}

static inline usz wired_cstr_len(const char* s) {
  usz n = 0;
  while (s[n]) n++;
  return n;
}

static inline u8 ascii_lower(u8 c) {
  return (c >= 'A' && c <= 'Z') ? (u8)(c | 0x20) : c;
}

static inline int ascii_dns_eq(wired_span a, wired_span b) {
  usz diff = 0;
  if (a.n != b.n) return 0;
  for (usz i = 0; i < a.n; i++)
    diff |= (usz)(ascii_lower(a.p[i]) ^ ascii_lower(b.p[i]));
  return diff == 0;
}
 
#endif