/* $OpenBSD: xmalloc.c,v 1.15 2026/07/12 20:16:20 nicm Exp $ */

/*

 * Author: Tatu Ylonen <ylo@cs.hut.fi>

 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland

 *                    All rights reserved

 * Versions of malloc and friends that check their results, and never return

 * failure (they call fatalx if they encounter an error).

 *

 * As far as I am concerned, the code I have written for this software

 * can be used freely for any purpose.  Any derived versions of this

 * software must be clearly marked as such, and if the derived work is

 * incompatible with the protocol description in the RFC file, it must be

 * called by a name other than "ssh" or "Secure Shell".

 */

#include <errno.h>

#include <limits.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "tmux.h"

void *

xmalloc(size_t size)

{

  void *ptr;

  if (size == 0)

    fatalx("xmalloc: zero size");

  ptr = malloc(size);

  if (ptr == NULL)

    fatal("xmalloc: allocating %zu bytes", size);

  return ptr;

}

void *

xcalloc(size_t nmemb, size_t size)

{

  void *ptr;

  if (size == 0 || nmemb == 0)

    fatalx("xcalloc: zero size");

  if (SIZE_MAX / nmemb < size)

    fatalx("xcalloc: nmemb * size > SIZE_MAX");

  ptr = calloc(nmemb, size);

  if (ptr == NULL)

    fatal("xcalloc: allocating %zu bytes", size * nmemb);

  return ptr;

}

void *

xrealloc(void *ptr, size_t size)

{

  return xreallocarray(ptr, 1, size);

}

void *

xreallocarray(void *ptr, size_t nmemb, size_t size)

{

  void *new_ptr;

  if (nmemb == 0 || size == 0)

    fatalx("xreallocarray: zero size");

  new_ptr = reallocarray(ptr, nmemb, size);

  if (new_ptr == NULL)

    fatal("xreallocarray: allocating %zu bytes", size * nmemb);

  return new_ptr;

}

void *

xrecallocarray(void *ptr, size_t oldnmemb, size_t nmemb, size_t size)

{

  void *new_ptr;

  if (nmemb == 0 || size == 0)

    fatalx("xrecallocarray: zero size");

  new_ptr = recallocarray(ptr, oldnmemb, nmemb, size);

  if (new_ptr == NULL)

    fatal("xrecallocarray: allocating %zu bytes", size * nmemb);

  return new_ptr;

}

char *

xstrdup(const char *str)

{

  char *cp;

  if ((cp = strdup(str)) == NULL)

    fatal("xstrdup");

  return cp;

}

char *

xstrndup(const char *str, size_t maxlen)

{

  char *cp;

  if ((cp = strndup(str, maxlen)) == NULL)

    fatal("xstrndup");

  return cp;

}

char *

xmemdup(const void *ptr, size_t len)

{

  char *cp;

  cp = xmalloc(len + 1);

  if (len != 0)

    memcpy(cp, ptr, len);

  cp[len] = '\0';

  return cp;

}

int

xasprintf(char **ret, const char *fmt, ...)

{

  va_list ap;

  int i;

  va_start(ap, fmt);

  i = xvasprintf(ret, fmt, ap);

  va_end(ap);

  return i;

}

int

xvasprintf(char **ret, const char *fmt, va_list ap)

{

  int i;

  i = vasprintf(ret, fmt, ap);

  if (i == -1 || *ret == NULL)

    fatal("xvasprintf");

  return i;

}

int

xsnprintf(char *str, size_t len, const char *fmt, ...)

{

  va_list ap;

  int i;

  va_start(ap, fmt);

  i = xvsnprintf(str, len, fmt, ap);

  va_end(ap);

  return i;

}

int

xvsnprintf(char *str, size_t len, const char *fmt, va_list ap)

{

  int i;

  if (len > INT_MAX)

    fatalx("xsnprintf: len > INT_MAX");

  i = vsnprintf(str, len, fmt, ap);

  if (i < 0 || i >= (int)len)

    fatalx("xsnprintf: overflow");

  return i;

}