doalloc.c

来自「ncurses-5.4」· C语言 代码 · 共 76 行

/****************************************************************************
 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
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 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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/****************************************************************************
 *  Author: Thomas E. Dickey <[e-mail]> 1998                        *
 ****************************************************************************/

/*
 * Wrapper for malloc/realloc.  Standard implementations allow realloc with
 * a null pointer, but older libraries may not (e.g., SunOS).
 *
 * Also if realloc fails, we discard the old memory to avoid leaks.
 */

#include <curses.priv.h>

MODULE_ID("$Id: doalloc.c,v 1.8 2002/08/31 21:48:11 Philippe.Blain Exp $")

NCURSES_EXPORT(void *)
_nc_doalloc(void *oldp, size_t amount)
{
    void *newp;

    if (oldp != 0) {
	if ((newp = realloc(oldp, amount)) == 0) {
	    free(oldp);
	    errno = ENOMEM;	/* just in case 'free' reset */
	}
    } else {
	newp = malloc(amount);
    }
    return newp;
}

#if !HAVE_STRDUP
NCURSES_EXPORT(char *)
_nc_strdup(const char *src)
{
    char *dst;
    if (src != 0) {
	dst = typeMalloc(char, strlen(src) + 1);
	if (dst != 0) {
	    (void) strcpy(dst, src);
	}
    } else {
	dst = 0;
    }
    return dst;
}
#endif