Given the following code containing errors, provide Common Weakness Enumeration (CWE) identifiers and corresponding messages in JSON format. Each identified weakness should have a unique entry in the JSON array.
    Code: Perl_my_setenv(pTHX_ const char *nam, const char *val)
{
  dVAR;
#ifdef __amigaos4__
  amigaos4_obtain_environ(__FUNCTION__);
#endif
#ifdef USE_ITHREADS
  /* only parent thread can modify process environment */
  if (PL_curinterp == aTHX)
#endif
  {
#ifndef PERL_USE_SAFE_PUTENV
    if (!PL_use_safe_putenv) {
        /* most putenv()s leak, so we manipulate environ directly */
        I32 i;
        const I32 len = strlen(nam);
        int nlen, vlen;

        /* where does it go? */
        for (i = 0; environ[i]; i++) {
            if (strnEQ(environ[i],nam,len) && environ[i][len] == '=')
                break;
        }

        if (environ == PL_origenviron) {   /* need we copy environment? */
            I32 j;
            I32 max;
            char **tmpenv;

            max = i;
            while (environ[max])
                max++;
            tmpenv = (char**)safesysmalloc((max+2) * sizeof(char*));
            for (j=0; j<max; j++) {         /* copy environment */
                const int len = strlen(environ[j]);
                tmpenv[j] = (char*)safesysmalloc((len+1)*sizeof(char));
                Copy(environ[j], tmpenv[j], len+1, char);
            }
            tmpenv[max] = NULL;
            environ = tmpenv;               /* tell exec where it is now */
        }
        if (!val) {
            safesysfree(environ[i]);
            while (environ[i]) {
                environ[i] = environ[i+1];
                i++;
            }
#ifdef __amigaos4__
            goto my_setenv_out;
#else
            return;
#endif
        }
        if (!environ[i]) {                 /* does not exist yet */
            environ = (char**)safesysrealloc(environ, (i+2) * sizeof(char*));
            environ[i+1] = NULL;    /* make sure it's null terminated */
        }
        else
            safesysfree(environ[i]);
        nlen = strlen(nam);
        vlen = strlen(val);

        environ[i] = (char*)safesysmalloc((nlen+vlen+2) * sizeof(char));
        /* all that work just for this */
        my_setenv_format(environ[i], nam, nlen, val, vlen);
    } else {
# endif
    /* This next branch should only be called #if defined(HAS_SETENV), but
       Configure doesn't test for that yet.  For Solaris, setenv() and unsetenv()
       were introduced in Solaris 9, so testing for HAS UNSETENV is sufficient.
    */
#   if defined(__CYGWIN__)|| defined(__SYMBIAN32__) || defined(__riscos__) || (defined(__sun) && defined(HAS_UNSETENV)) || defined(PERL_DARWIN)
#       if defined(HAS_UNSETENV)
        if (val == NULL) {
            (void)unsetenv(nam);
        } else {
            (void)setenv(nam, val, 1);
        }
#       else /* ! HAS_UNSETENV */
        (void)setenv(nam, val, 1);
#       endif /* HAS_UNSETENV */
#   elif defined(HAS_UNSETENV)
        if (val == NULL) {
            if (environ) /* old glibc can crash with null environ */
                (void)unsetenv(nam);
        } else {
	    const int nlen = strlen(nam);
	    const int vlen = strlen(val);
	    char * const new_env =
                (char*)safesysmalloc((nlen + vlen + 2) * sizeof(char));
            my_setenv_format(new_env, nam, nlen, val, vlen);
            (void)putenv(new_env);
        }
#   else /* ! HAS_UNSETENV */
        char *new_env;
	const int nlen = strlen(nam);
	int vlen;
        if (!val) {
	   val = "";
        }
        vlen = strlen(val);
        new_env = (char*)safesysmalloc((nlen + vlen + 2) * sizeof(char));
        /* all that work just for this */
        my_setenv_format(new_env, nam, nlen, val, vlen);
        (void)putenv(new_env);
#   endif /* __CYGWIN__ */
#ifndef PERL_USE_SAFE_PUTENV
    }
#endif
  }
#ifdef __amigaos4__
my_setenv_out:
  amigaos4_release_environ(__FUNCTION__);
#endif
} ; Sample JSON Format Confermily Expected output: "examples" => "cwe": "xxx"; "message": "xxx"
    
 'cwe': ['CWE-119', 'CWE-703', 'CWE-787'], 'message': 'Perl_my_setenv(); handle integer wrap

RT #133204

Wean this function off int/I32 and onto UV/Size_t.
Also, replace all malloc-ish calls with a wrapper that does
overflow checks,

In particular, it was doing (nlen + vlen + 2) which could wrap when
the combined length of the environment variable name and value
exceeded around 0x7fffffff.

The wrapper check function is probably overkill, but belt and braces...

NB this function has several variant parts, #ifdef'ed by platform
type; I have blindly changed the parts that aren't compiled under linux.'