static int calcitem_parse_expression(DC_ITEM *dc_item, expression_t *exp, char *error, int max_error_len)
{
const char *__function_name = "calcitem_parse_expression";
char *e, *f, *func = NULL, *params = NULL;
size_t exp_alloc = 128, exp_offset = 0, len;
int functionid, ret;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() expression:'%s'", __function_name, dc_item->params);
assert(dc_item);
assert(exp);
exp->exp = zbx_malloc(exp->exp, exp_alloc);
for (e = dc_item->params; '\0' != *e; e++)
{
if (SUCCEED != is_function_char(*e))
{
zbx_chrcpy_alloc(&exp->exp, &exp_alloc, &exp_offset, *e);
continue;
}
if ((0 == strncmp("and", e, len = 3) || 0 == strncmp("not", e, 3) || 0 == strncmp("or", e, len = 2)) &&
NULL != strchr("()" ZBX_WHITESPACE, e[len]))
{
zbx_strncpy_alloc(&exp->exp, &exp_alloc, &exp_offset, e, len);
e += len - 1;
continue;
}
f = e;
if (SUCCEED != parse_function(&e, &func, ¶ms))
{
e = f;
zbx_chrcpy_alloc(&exp->exp, &exp_alloc, &exp_offset, *f);
continue;
}
else
e--;
functionid = calcitem_add_function(exp, func, params);
zabbix_log(LOG_LEVEL_DEBUG, "%s() functionid:%d function:'%s(%s)'",
__function_name, functionid, func, params);
func = NULL;
params = NULL;
zbx_snprintf_alloc(&exp->exp, &exp_alloc, &exp_offset, "{%d}", functionid);
}
zabbix_log(LOG_LEVEL_DEBUG, "%s() expression:'%s'", __function_name, exp->exp);
if (FAIL == (ret = substitute_simple_macros(NULL, NULL, NULL, NULL, NULL, &dc_item->host, NULL, NULL,
&exp->exp, MACRO_TYPE_ITEM_EXPRESSION, error, max_error_len)))
ret = NOTSUPPORTED;
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __function_name, zbx_result_string(ret));
return ret;
}
bool resolve_symvar_functions( char * buf )
{
static const char ampchar = '&';
inp_line * in_wk;
char * workb;
char * pw;
char * pwend;
char * p2;
char * pchar;
char * varstart;
sub_index var_ind;
symvar symvar_entry;
symsub * symsubval;
size_t buf_lg;
int rc;
bool functions_found;
bool anything_substituted;
char * var_unresolved; // ptr for resume search
char * var_unresolved2;// ptr for resume search
ProcFlags.substituted = false;
ProcFlags.unresolved = false;
if( NULL == strchr( buf, ampchar ) ) { // look for & in buffer
return( false ); // no ampchar found, nothing to resolve
}
anything_substituted = false;
var_unresolved = NULL;
var_unresolved2 = NULL;
functions_found = false;
in_wk = mem_alloc( sizeof( inp_line ) + buf_size );// allocate workbuffer
in_wk->next = NULL;
workb = in_wk->value; // allocate workbuffer
do { // until no more substitutions
strcpy( workb, buf ); // copy input buffer
buf_lg = strlen( buf );
pwend = workb + buf_lg - 1;
if( var_unresolved == NULL ) {
pw = workb;
p2 = buf;
} else {
pw = workb + (var_unresolved2 - buf);
p2 = var_unresolved2;
}
varstart = NULL;
anything_substituted |= ProcFlags.substituted;
ProcFlags.substituted = false;
pchar = strchr( workb, ampchar ); // look for & in buffer
while( pchar != NULL ) { // & found
if( *(pchar + 1) == ' ' ) { // not a symbol substition or function
pchar = strchr( pchar + 1, ampchar ); // look for next & in buffer
continue;
}
while( pw < pchar ) { // copy all data preceding &
*p2++ = *pw++;
}
buf_lg = strlen( buf );
if( isalpha( *(pchar + 1) ) && *(pchar + 2) == '\''
&& *(pchar + 3) > ' ' ) {
// not for .if '&*' eq '' .th ...
// only .if '&x'foo' eq '' .th
char * * ppval = &p2;
/***********************************************************/
/* Some single letter functions are resolved here: */
/* */
/* functions used within the OW doc build system: */
/* &e' existance of variable 0 or 1 */
/* &l' length of variable content */
/* or if undefined variable length of name */
/* &u' upper */
/* */
/* &s' subscript */
/* &S' superscript */
/* */
/* other single letter functions are not used AFAIK */
/* */
/***********************************************************/
if( GlobalFlags.firstpass && input_cbs->fmflags & II_research ) {
add_single_func_research( pchar + 1 );
}
pw = scr_single_funcs( pchar, pwend, ppval );
pchar = strchr( pw, ampchar ); // look for next & in buffer
continue;
}
if( *(pchar + 1) == '\'' ) {// perhaps a multi letter function
char * pf;
char * * ppval = &p2;
int32_t valsize = buf_size - (p2 - buf);
pf = pchar + 2;
while( is_function_char( *pf ) ) {
pf++;
}
if( *pf == '(' ) {// &'xyz( is start of multi char function
/***********************************************************/
/* Some multi letter functions are resolved here: */
/* */
/* functions used within the OW doc build system: */
/* */
/* &'delstr( &'d2c( &'index( */
/* &'insert( &'left( &'length( */
/* &'lower( &'min( &'pos( */
/* &'right( &'strip( &'substr( */
/* &'subword( &'translate( &'upper( */
/* &'veclastpos( &'vecpos( &'word( */
/* &'wordpos( &'words( */
/* */
/* Others are recognized but not processed */
/* &'c2x( is used for test output */
/***********************************************************/
pw = scr_multi_funcs( pchar, pwend, ppval, valsize );
pchar = strchr( pw, ampchar );// look for next & in buffer
continue;
}
*p2++ = *pw++; // copy &
pchar = strchr( pw, ampchar ); // look for next & in buffer
continue; // and ignore this &... for now
}
/***************************************************************/
/* & is neither start of single char function */
/* nor start of multi char function */
/* */
/* & is probably start of a variable */
/***************************************************************/
varstart = pw; // remember start of var
pw++; // over &
ProcFlags.suppress_msg = true;
scan_err = false;
pchar = scan_sym( pw, &symvar_entry, &var_ind );
if( scan_err && *pchar == '(' ) { // problem with subscript
if( var_unresolved == NULL ) {
ProcFlags.unresolved = true;
var_unresolved = varstart;
var_unresolved2 = p2;
} else {
if( var_unresolved != varstart ) {
ProcFlags.unresolved = true;
}
}
p2 += pchar - varstart;
pw = pchar;
pchar = strchr( pw, ampchar ); // look for next & in buffer
continue;
}
ProcFlags.suppress_msg = false;
if( symvar_entry.flags & local_var ) { // lookup var in dict
rc = find_symvar_l( &input_cbs->local_dict, symvar_entry.name,
var_ind, &symsubval );
} else {
rc = find_symvar( &global_dict, symvar_entry.name, var_ind,
&symsubval );
}
if( rc == 2 ) { // variable found + resolved
ProcFlags.substituted = true;
if( !ProcFlags.CW_sep_ignore &&
symsubval->value[0] == CW_sep_char &&
symsubval->value[1] != CW_sep_char ) {
// split record at control word separator
// if variable starts with SINGLE cw separator
// and ignore cw separator
if( buf != buff2 ) {
// splitting input if not outermost buffer ++++ TBD
// needed ???
g_suicide();
}
if( *pchar == '.' ) {
pchar++; // skip optional terminating dot
}
*p2 = '\0';
split_input_var( buf, pchar, &symsubval->value[1], true );
pw = pwend + 1; // stop substitution for this record
varstart = NULL;
break;
} else {
pw = symsubval->value;
if( symsubval->value[0] == CW_sep_char &&
symsubval->value[1] == CW_sep_char ) {
pw++; // skip 1 CW_sep_char
}
strcpy( p2, pw ); // copy value
p2 += strlen(pw);
if( *pchar == '.' ) {
pchar++; // skip optional terminating dot
}
pw = pchar;
}
} else { // variable not found
if( (symvar_entry.flags & local_var ) // local var not found
) {
if( (symvar_entry.name[0] == '\0') &&
(*pchar == ampchar) ) { // only &* as var name
// followed by another var
if( var_unresolved == NULL ) {
ProcFlags.unresolved = true;
var_unresolved = varstart;
var_unresolved2 = p2;
} else {
if( var_unresolved != varstart ) {
ProcFlags.unresolved = true;
}
}
pw = varstart;
while( pw < pchar ) { // treat var name as text
*p2++ = *pw++; // and copy
}
continue; // pchar points already to next &
} else { // replace not found local var by nullstring
ProcFlags.substituted = true;
if( *pchar == '.' ) {
pchar++; // skip optional terminating dot
}
pw = pchar;
}
} else { // global var not found
// .. or local var outside of macro
/*******************************************************/
/* keep trying for constructs such as */
/* */
/* .se prodgml = "Open Watcom GML" */
/* .se name = "GML" */
/* */
/* My name is &prod&name..! */
/* */
/* to become */
/* */
/* My name is Open Watcom GML! */
/* */
/* This does not work for local variables, as these are*/
/* replaced by nullstring if not found */
/* My name is &*prod&*name..! */
/* will become */
/* My name is ! */
/*******************************************************/
if( var_unresolved == NULL ) {
ProcFlags.unresolved = true;
var_unresolved = varstart;
var_unresolved2 = p2;
} else {
if( var_unresolved != varstart ) {
ProcFlags.unresolved = true;
}
}
pw = varstart;
if( *pchar == '.' ) {
pchar++; // copy terminating dot, too
}
while( pw < pchar ) { // treat var name as text
*p2++ = *pw++; // and copy
}
}
}
pchar = strchr( pw, ampchar ); // look for next & in buffer
} // while & found
while( pw <= pwend) { // copy remaining input
*p2++ = *pw++;
}
*p2 = 0; // terminate string
} while( ProcFlags.unresolved && ProcFlags.substituted );
anything_substituted |= ProcFlags.substituted;
mem_free( in_wk ); // free workbuffer
return( anything_substituted );
}
