ISO/IEC TS 17961 [strmod]

Writing to const qualified object occurs when you do one of the following:

For instance, the defect can occur in the following situations:

The risk depends upon the modifications made to the const-qualified object.

The fix depends on the modification made to the const-qualified object.

See examples of fixes below.

If you do not want to fix the issue, add comments to your result or code to avoid another review. See:

#include <string.h>

const char* buffer = "abcdeXXXXXXX";

void func(char* string) {
    char *ptr = (char*)strchr(buffer,'X');
    if(ptr)
        strcpy(ptr,string);
}

In this example, because buffer is const-qualified, strchr(buffer,'X') returns a const-qualified char* pointer. When this char* pointer is used as the destination argument of strcpy, a Writing to const qualified object error appears.

One possible correction is to assign the constant string to a non-const object and use the non-const object as destination argument of strchr.

#include <string.h>

char buffer[] = "abcdeXXXXXXX";

void func(char* string) { 
    char *ptr = (char*)strchr(buffer,'X');
    if(ptr)
        strcpy(ptr,string);
}