/*
 * Copyright (c) 2007, Novell Inc.
 *
 * This program is licensed under the BSD license, read LICENSE.BSD
 * for further information
 */

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#ifdef _WIN32
  #include <windows.h>
  #include <io.h>
#else
  #include <sys/time.h>
#endif

#include "util.h"

void
solv_oom(size_t num, size_t len)
{
  if (num)
    fprintf(stderr, "Out of memory allocating %zu*%zu bytes!\n", num, len);
  else
    fprintf(stderr, "Out of memory allocating %zu bytes!\n", len);
  abort();
  exit(1);
}

void *
solv_malloc(size_t len)
{
  void *r = malloc(len ? len : 1);
  if (!r)
    solv_oom(0, len);
  return r;
}

void *
solv_malloc2(size_t num, size_t len)
{
  if (len && (num * len) / len != num)
    solv_oom(num, len);
  return solv_malloc(num * len);
}

void *
solv_realloc(void *old, size_t len)
{
  if (old == 0)
    old = malloc(len ? len : 1);
  else
    old = realloc(old, len ? len : 1);
  if (!old)
    solv_oom(0, len);
  return old;
}

void *
solv_realloc2(void *old, size_t num, size_t len)
{
  if (len && (num * len) / len != num)
    solv_oom(num, len);
  return solv_realloc(old, num * len);
}

void *
solv_calloc(size_t num, size_t len)
{
  void *r;
  if (num == 0 || len == 0)
    r = malloc(1);
  else
    r = calloc(num, len);
  if (!r)
    solv_oom(num, len);
  return r;
}

/* this was solv_realloc2(old, len, size), but we now overshoot
 * for huge len sizes */
void *
solv_extend_realloc(void *old, size_t len, size_t size, size_t block)
{
  size_t xblock = (block + 1) << 5;
  len = (len + block) & ~block;
  if (len >= xblock && xblock)
    {
      xblock <<= 1;
      while (len >= xblock && xblock)
	xblock <<= 1;
      if (xblock)
	{
	  size_t nlen;
          xblock = (xblock >> 5) - 1;
	  nlen = (len + xblock) & ~xblock;
	  if (nlen > len)
	    len = nlen;
	}
    }
  return solv_realloc2(old, len, size);
}

void *
solv_free(void *mem)
{
  if (mem)
    free(mem);
  return 0;
}

char *
solv_strdup(const char *s)
{
  char *r;
  if (!s)
    return 0;
  r = strdup(s);
  if (!r)
    solv_oom(0, strlen(s));
  return r;
}

unsigned int
solv_timems(unsigned int subtract)
{
#ifdef _WIN32
  return GetTickCount() - subtract;
#else
  struct timeval tv;
  unsigned int r;

  if (gettimeofday(&tv, 0))
    return 0;
  r = (((unsigned int)tv.tv_sec >> 16) * 1000) << 16;
  r += ((unsigned int)tv.tv_sec & 0xffff) * 1000;
  r += (unsigned int)tv.tv_usec / 1000;
  return r - subtract;
#endif
}

int
solv_setcloexec(int fd, int state)
{
  #ifdef _WIN32
    return SetHandleInformation((HANDLE) _get_osfhandle(fd), HANDLE_FLAG_INHERIT, state ? 0 : HANDLE_FLAG_INHERIT);
  #else
    return fcntl(fd, F_SETFD, state ? FD_CLOEXEC : 0) == 0;
  #endif
}

/* bsd's qsort_r has different arguments, so we define our
   own version in case we need to do some clever mapping

   see also: http://sources.redhat.com/ml/libc-alpha/2008-12/msg00003.html
 */
#if (defined(__GLIBC__) || defined(__NEWLIB__)) && (defined(HAVE_QSORT_R) || defined(HAVE___QSORT_R))

void
solv_sort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *, void *), void *compard)
{
# if defined(HAVE_QSORT_R)
  qsort_r(base, nmemb, size, compar, compard);
# else
  /* backported for SLE10-SP2 */
  __qsort_r(base, nmemb, size, compar, compard);
# endif

}

#elif defined(HAVE_QSORT_R) /* not glibc, but has qsort_r() */

struct solv_sort_data {
  int (*compar)(const void *, const void *, void *);
  void *compard;
};

static int
solv_sort_helper(void *compard, const void *a, const void *b)
{
  struct solv_sort_data *d = compard;
  return (*d->compar)(a, b, d->compard);
}

void
solv_sort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *, void *), void *compard)
{
  struct solv_sort_data d;
  d.compar = compar;
  d.compard = compard;
  qsort_r(base, nmemb, size, &d, solv_sort_helper);
}

#else /* not glibc and no qsort_r() */
/* use own version of qsort if none available */
#include "qsort_r.c"
#endif

char *
solv_dupjoin(const char *str1, const char *str2, const char *str3)
{
  int l1, l2, l3;
  char *s, *str;
  l1 = str1 ? strlen(str1) : 0;
  l2 = str2 ? strlen(str2) : 0;
  l3 = str3 ? strlen(str3) : 0;
  s = str = solv_malloc(l1 + l2 + l3 + 1);
  if (l1)
    {
      strcpy(s, str1);
      s += l1;
    }
  if (l2)
    {
      strcpy(s, str2);
      s += l2;
    }
  if (l3)
    {
      strcpy(s, str3);
      s += l3;
    }
  *s = 0;
  return str;
}

char *
solv_dupappend(const char *str1, const char *str2, const char *str3)
{
  char *str = solv_dupjoin(str1, str2, str3);
  solv_free((void *)str1);
  return str;
}

int
solv_hex2bin(const char **strp, unsigned char *buf, int bufl)
{
  const char *str = *strp;
  int i;

  for (i = 0; i < bufl; i++)
    {
      int c = *str;
      int d;
      if (c >= '0' && c <= '9')
        d = c - '0';
      else if (c >= 'a' && c <= 'f')
        d = c - ('a' - 10);
      else if (c >= 'A' && c <= 'F')
        d = c - ('A' - 10);
      else
	break;
      c = str[1];
      d <<= 4;
      if (c >= '0' && c <= '9')
        d |= c - '0';
      else if (c >= 'a' && c <= 'f')
        d |= c - ('a' - 10);
      else if (c >= 'A' && c <= 'F')
        d |= c - ('A' - 10);
      else
	break;
      buf[i] = d;
      str += 2;
    }
  *strp = str;
  return i;
}

char *
solv_bin2hex(const unsigned char *buf, int l, char *str)
{
  int i;
  for (i = 0; i < l; i++, buf++)
    {
      int c = *buf >> 4;
      *str++ = c < 10 ? c + '0' : c + ('a' - 10);
      c = *buf & 15;
      *str++ = c < 10 ? c + '0' : c + ('a' - 10);
    }
  *str = 0;
  return str;
}

size_t
solv_validutf8(const char *buf)
{
  const unsigned char *p;
  int x;

  for (p = (const unsigned char *)buf; (x = *p) != 0; p++)
    {
      if (x < 0x80)
	continue;
      if (x < 0xc0)
	break;
      if (x < 0xe0)
	{
	  /* one byte to follow */
	  if ((p[1] & 0xc0) != 0x80)
	    break;
	  if ((x & 0x1e) == 0)
	    break;	/* not minimal */
	  p += 1;
	  continue;
	}
      if (x < 0xf0)
	{
	  /* two bytes to follow */
	  if ((p[1] & 0xc0) != 0x80 || (p[2] & 0xc0) != 0x80)
	    break;
	  if ((x & 0x0f) == 0 && (p[1] & 0x20) == 0)
	    break;	/* not minimal */
	  if (x == 0xed && (p[1] & 0x20) != 0)
	    break;	/* d800-dfff surrogate */
	  if (x == 0xef && p[1] == 0xbf && (p[2] == 0xbe || p[2] == 0xbf))
	    break;	/* fffe or ffff */
	  p += 2;
	  continue;
	}
      if (x < 0xf8)
	{
	  /* three bytes to follow */
	  if ((p[1] & 0xc0) != 0x80 || (p[2] & 0xc0) != 0x80 || (p[3] & 0xc0) != 0x80)
	    break;
	  if ((x & 0x07) == 0 && (p[1] & 0x30) == 0)
	    break;	/* not minimal */
	  if ((x & 0x07) > 4 || ((x & 0x07) == 4 && (p[1] & 0x30) != 0))
	    break;	/* above 0x10ffff */
	  p += 3;
	  continue;
	}
      break;	/* maybe valid utf8, but above 0x10ffff */
    }
  return (const char *)p - buf;
}

char *
solv_latin1toutf8(const char *buf)
{
  int l = 1;
  const char *p;
  char *r, *rp;

  for (p = buf; *p; p++)
    if ((*(const unsigned char *)p & 128) != 0)
      l++;
  r = rp = solv_malloc(p - buf + l);
  for (p = buf; *p; p++)
    {
      if ((*(const unsigned char *)p & 128) != 0)
	{
	  *rp++ = *(const unsigned char *)p & 64 ? 0xc3 : 0xc2;
	  *rp++ = *p & 0xbf;
	}
      else
        *rp++ = *p;
    }
  *rp = 0;
  return r;
}

char *
solv_replacebadutf8(const char *buf, int replchar)
{
  size_t l, nl;
  const char *p;
  char *r = 0, *rp = 0;
  int repllen, replin;

  if (replchar < 0 || replchar > 0x10ffff)
    replchar = 0xfffd;
  if (!replchar)
    repllen = replin = 0;
  else if (replchar < 0x80)
    {
      repllen = 1;
      replin = (replchar & 0x40) | 0x80;
    }
  else if (replchar < 0x800)
    {
      repllen = 2;
      replin = 0x40;
    }
  else if (replchar < 0x10000)
    {
      repllen = 3;
      replin = 0x60;
    }
  else
    {
      repllen = 4;
      replin = 0x70;
    }
  for (;;)
    {
      for (p = buf, nl = 0; *p; )
	{
	  l = solv_validutf8(p);
	  if (rp && l)
	    {
	      memcpy(rp, p, l);
	      rp += l;
	    }
	  nl += l;
	  p += l;
	  if (!*p)
	    break;
	  /* found a bad char, replace with replchar */
	  if (rp && replchar)
	    {
	      switch (repllen)
		{
		case 4:
		  *rp++ = (replchar >> 18 & 0x3f) | 0x80;
		case 3:
		  *rp++ = (replchar >> 12 & 0x3f) | 0x80;
		case 2:
		  *rp++ = (replchar >> 6  & 0x3f) | 0x80;
		default:
		  *rp++ = (replchar       & 0x3f) | 0x80;
		}
	      rp[-repllen] ^= replin;
	    }
	  nl += repllen;
	  p++;
	  while ((*(const unsigned char *)p & 0xc0) == 0x80)
	    p++;
	}
      if (rp)
	break;
      r = rp = solv_malloc(nl + 1);
    }
  *rp = 0;
  return r;
}