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# avrmalloc.c

Go to the documentation of this file.

    00001 /*
    00002  * $Id: avrmalloc.c,v 1.7 2003/12/01 09:10:14 troth Exp $
    00003  *
    00004  ****************************************************************************
    00005  *
    00006  * simulavr - A simulator for the Atmel AVR family of microcontrollers.
    00007  * Copyright (C) 2001, 2002, 2003  Theodore A. Roth
    00008  *
    00009  * This program is free software; you can redistribute it and/or modify
    00010  * it under the terms of the GNU General Public License as published by
    00011  * the Free Software Foundation; either version 2 of the License, or
    00012  * (at your option) any later version.
    00013  *
    00014  * This program is distributed in the hope that it will be useful,
    00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00017  * GNU General Public License for more details.
    00018  *
    00019  * You should have received a copy of the GNU General Public License
    00020  * along with this program; if not, write to the Free Software
    00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00022  *
    00023  ****************************************************************************
    00024  */
    00025
    00026 /**
    00027    \file avrmalloc.c
    00028    \brief Memory Management Functions.
    00029
    00030    This module provides facilities for managing memory.
    00031
    00032    There is no need to check the returned values from any of these
    00033    functions. Any memory allocation failure is considered fatal and the
    00034    program is terminated.
    00035
    00036    We want to wrap all functions that allocate memory. This way we can
    00037    add secret code to track memory usage and debug memory leaks if we
    00038    want. Right now, I don't want to ;). */
    00039
    00040 #include <stdlib.h>
    00041 #include <string.h>
    00042
    00043 #include "avrerror.h"
    00044 #include "avrmalloc.h"
    00045
    00046 /* These macros are only here for documentation purposes. */
    00047
    00048 #if MACRO_DOCUMENTATION
    00049
    00050 /** \brief Macro for allocating memory.
    00051     \param type  The C type of the memory to allocate.
    00052     \param count Allocate enough memory hold count types.
    00053
    00054     This macro is just a wrapper for avr_malloc() and should be used to avoid
    00055     the repetitive task of casting the returned pointer. */
    00056
    00057 #define avr_new(type, count)          \
    00058     ((type *) avr_malloc ((unsigned) sizeof (type) * (count)))
    00059
    00060 /** \brief Macro for allocating memory and initializing it to zero.
    00061     \param type  The C type of the memory to allocate.
    00062     \param count Allocate enough memory hold count types.
    00063
    00064     This macro is just a wrapper for avr_malloc0() and should be used to avoid
    00065     the repetitive task of casting the returned pointer. */
    00066
    00067 #define avr_new0(type, count)         \
    00068     ((type *) avr_malloc0 ((unsigned) sizeof (type) * (count)))
    00069
    00070 /** \brief Macro for allocating memory.
    00071     \param type  The C type of the memory to allocate.
    00072     \param mem   Pointer to existing memory.
    00073     \param count Allocate enough memory hold count types.
    00074
    00075     This macro is just a wrapper for avr_malloc() and should be used to avoid
    00076     the repetitive task of casting the returned pointer. */
    00077
    00078 #define avr_renew(type, mem, count)   \
    00079    ((type *) avr_realloc (mem, (unsigned) sizeof (type) * (count)))
    00080
    00081 #endif /* MACRO_DOCUMENTATION */
    00082
    00083 /** \brief Allocate memory and initialize to zero.
    00084
    00085     Use the avr_new() macro instead of this function.
    00086
    00087     There is no need to check the returned value, since this function will
    00088     terminate the program if the memory allocation fails.
    00089
    00090     No memory is allocated if passed a size of zero. */
    00091
    00092 void *
    00093 avr_malloc (size_t size)
    00094 {
    00095     if (size)
    00096     {
    00097         void *ptr;
    00098         ptr = malloc (size);
    00099         if (ptr)
    00100             return ptr;
    00101
    00102         avr_error ("malloc failed");
    00103     }
    00104     return NULL;
    00105 }
    00106
    00107 /** \brief Allocate memory and initialize to zero.
    00108
    00109     Use the avr_new0() macro instead of this function.
    00110
    00111     There is no need to check the returned value, since this function will
    00112     terminate the program if the memory allocation fails.
    00113
    00114     No memory is allocated if passed a size of zero. */
    00115
    00116 void *
    00117 avr_malloc0 (size_t size)
    00118 {
    00119     if (size)
    00120     {
    00121         void *ptr;
    00122         ptr = calloc (1, size);
    00123         if (ptr)
    00124             return ptr;
    00125
    00126         avr_error ("malloc0 failed");
    00127     }
    00128     return NULL;
    00129 }
    00130
    00131 /** \brief Wrapper for realloc().
    00132 x
    00133     Resizes and possibly allocates more memory for an existing memory block.
    00134
    00135     Use the avr_renew() macro instead of this function.
    00136
    00137     There is no need to check the returned value, since this function will
    00138     terminate the program if the memory allocation fails.
    00139
    00140     No memory is allocated if passed a size of zero. */
    00141
    00142 void *
    00143 avr_realloc (void *ptr, size_t size)
    00144 {
    00145     if (size)
    00146     {
    00147         ptr = realloc (ptr, size);
    00148         if (ptr)
    00149             return ptr;
    00150
    00151         avr_error ("realloc failed\n");
    00152     }
    00153     return NULL;
    00154 }
    00155
    00156 /** \brief Wrapper for strdup().
    00157
    00158     Returns a copy of the passed in string. The returned copy must be
    00159     free'd.
    00160
    00161     There is no need to check the returned value, since this function will
    00162     terminate the program if the memory allocation fails.
    00163
    00164     It is safe to pass a NULL pointer. No memory is allocated if a NULL is
    00165     passed. */
    00166
    00167 char *
    00168 avr_strdup (const char *s)
    00169 {
    00170     if (s)
    00171     {
    00172         char *ptr;
    00173         ptr = strdup (s);
    00174         if (ptr)
    00175             return ptr;
    00176
    00177         avr_error ("strdup failed");
    00178     }
    00179     return NULL;
    00180 }
    00181
    00182 /** \brief Free malloc'd memory.
    00183
    00184     It is safe to pass a null pointer to this function. */
    00185
    00186 void
    00187 avr_free (void *ptr)
    00188 {
    00189     if (ptr)
    00190         free (ptr);
    00191 }

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