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Full Discussion: C: Initialize "const" array from the "heap"
Top Forums Programming C: Initialize "const" array from the "heap" Post 302468338 by jim mcnamara on Tuesday 2nd of November 2010 11:57:26 AM
Old 11-02-2010
Here is simple code that uses a static storage are, referenced by a const char * which persists thru the duration of the code on the stack frame for main().

I really am unsure what you are trying to do; this is the best answer I can give you.

Code:
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>

static
char *tmp=NULL;

char *loadit(FILE *in, const int len)
{
    tmp=malloc(len+1);
    fread(tmp, len, 1, in);

    return tmp;
}

size_t filesize(int fd)
{
    struct stat st;
    fstat(fd, &st);

    return st.st_size;
}

int main(int argc, char **argv)
{
    FILE *in=fopen("filename", "r");
    int filelen=filesize(fileno(in));   
    const char *constmem = loadit(in, filelen);
    printf("%s\n", constmem); // assumes readable file content
    fclose(in);
    free(tmp);
    return 0;
}

as long as you pass the constmem pointer to subsequent functions, you have static const memory that was "dynamically" loaded. Add error checking.
 

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LEARN ABOUT DEBIAN

sodebug

SoDebug(3)							       Coin								SoDebug(3)

NAME

       SoDebug -

SYNOPSIS

       #include <SoDebug.h>

   Static Public Member Functions
       static const char * GetEnv (const char *var)
       static void RTPrintf (const char *formatstr,...)
       static void NamePtr (const char *name, void *ptr)
       static const char * PtrName (void *ptr)
       static void write (SoNode *node)
       static void writeToFile (SoNode *node, const char *filename)
       static void writeField (SoField *field)
       static void printName (SoBase *base)

Detailed Description
       The SoDebug class is a small collection of debugging-related functions.

Member Function Documentation
   const char * SoDebug::GetEnv (const char *var) [static]
       This is a portable getenv-wrapper.

       See also:
	   coin_getenv()

   void SoDebug::RTPrintf (const char *formatstr, ...) [static]
       Real-time printf designed for use when use of standard printf() would cause timing problems.

       NOT IMPLEMENTED. Currently it just forwards to printf().

   void SoDebug::NamePtr (const char *name, void *ptr) [static]
       Associate a name with an arbitrary pointer. You can fetch the name of the pointer later with PtrName().

       See also:
	   PtrName()

   const char * SoDebug::PtrName (void *ptr) [static]
       Returns the name set on a pointer with NamePtr(). If no name has been set, '<unnamed>' is returned.

       See also:
	   NamePtr()

   void SoDebug::write (SoNode *node) [static]
       Writes the node to stdout.

   void SoDebug::writeToFile (SoNode *node, const char *filename) [static]
       Writes the node to the given filename, or /tmp/debug.iv if filename is NULL.

   void SoDebug::writeField (SoField *field) [static]
       Not implemented.

   void SoDebug::printName (SoBase *base) [static]
       Not implemented.

Author
       Generated automatically by Doxygen for Coin from the source code.

Version 3.1.3							  Wed May 23 2012							SoDebug(3)
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