Dynamic memory allocation of arrayed char

OpenGL OpenGL: Advanced Coding
1

I’m having problems allocating memory for an array of strings. Here’s my code:
(char **val1 = NULL and char **val2 = NULL exist).
There seems to be a problem as to where the pointers are pointing in memory since val1 sometimes returns the content of val2. Thanks for any help in advanced.

char tmpval1;
if((tmpval1 = (char)realloc(val1, size*sizeof(char))) == NULL)
{
return ERROR_MEM;
}
val1 = tmpval1;

char tmpval2;
if((tmpval2 = (char)realloc(val2, size*sizeof(char))) == NULL)
{
return ERROR_MEM;
}
val2 = tmpval2;

2

Achtung!

It appears to me that you are allocating an array of chars and storing a pointer to the allocated data as a pointer to a pointer to chars.

If you want to allocate a single string, you write char *tmpval1 rather than char**tmpval1.

char tmpval1;
if((tmpval1 = (char)realloc(val1, sizesizeof(char))) == NULL)
{
return ERROR_MEM;
}
val1 = tmpval1;
char tmpval2;
if((tmpval2 = (char)realloc(val2, sizesizeof(char))) == NULL)
{
return ERROR_MEM;
}
val2 = tmpval2;

3

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