ast_expr.h File Reference

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Functions
int	ast_expr (char *expr, char *buf, int length, struct ast_channel *chan)
	Evaluate the given expression. More...
int	ast_str_expr (struct ast_str **str, ssize_t maxlen, struct ast_channel *chan, char *expr)
	Evaluate the given expression. More...

Detailed Description

???????

Todo:

Explain this file!

Definition in file ast_expr.h.

Function Documentation

ast_expr()

int ast_expr	(	char *	expr,
		char *	buf,
		int	length,
		struct ast_channel *	chan
	)

Evaluate the given expression.

Parameters

expr	An expression
buf	Result buffer
length	Size of the result buffer, in bytes
chan	Channel to use for evaluating included dialplan functions, if any

Returns

Length of the result string, in bytes

Definition at line 2405 of file ast_expr2f.c.

Referenced by AST_TEST_DEFINE(), check_eval(), check_pval_item(), is_zero_or_null(), and pbx_substitute_variables_helper_full().

{
   struct parse_io io = { .string = expr, .chan = chan };
   int return_value = 0;

   ast_yylex_init(&io.scanner);

   ast_yy_scan_string(expr, io.scanner);

   ast_yyparse ((void *) &io);

   ast_yylex_destroy(io.scanner);

   if (!io.val) {
      if (length > 1) {
         strcpy(buf, "0");
         return_value = 1;
      }
   } else {
      if (io.val->type == AST_EXPR_number) {
         int res_length;

         res_length = snprintf(buf, length, FP___PRINTF, io.val->u.i);
         return_value = (res_length <= length) ? res_length : length;
      } else {
         if (io.val->u.s)
#if defined(STANDALONE) || defined(LOW_MEMORY) || defined(STANDALONE)
            strncpy(buf, io.val->u.s, length - 1);
#else /* !STANDALONE && !LOW_MEMORY */
            ast_copy_string(buf, io.val->u.s, length);
#endif /* STANDALONE || LOW_MEMORY */
         else
            buf[0] = 0;
         return_value = strlen(buf);
         free(io.val->u.s);
      }
      free(io.val);
   }
   return return_value;
}

ast_str_expr()

int ast_str_expr	(	struct ast_str **	str,
		ssize_t	maxlen,
		struct ast_channel *	chan,
		char *	expr
	)

Evaluate the given expression.

Parameters

str	Dynamic result buffer
maxlen	<0 if the size of the buffer should remain constant, >0 if the size of the buffer should expand to that many bytes, maximum, or 0 for unlimited expansion of the result buffer
chan	Channel to use for evaluating included dialplan functions, if any
expr	An expression

Returns

Length of the result string, in bytes

Definition at line 2447 of file ast_expr2f.c.

References AST_EXPR_number, ast_str_set(), ast_str_strlen(), ast_yy_scan_string(), ast_yylex_destroy(), ast_yylex_init(), ast_yyparse(), FP___PRINTF, free(), parse_io::scanner, and parse_io::string.

Referenced by ast_str_substitute_variables_full().

{
   struct parse_io io = { .string = expr, .chan = chan };

   ast_yylex_init(&io.scanner);
   ast_yy_scan_string(expr, io.scanner);
   ast_yyparse ((void *) &io);
   ast_yylex_destroy(io.scanner);

   if (!io.val) {
      ast_str_set(str, maxlen, "0");
   } else {
      if (io.val->type == AST_EXPR_number) {
         ast_str_set(str, maxlen, FP___PRINTF, io.val->u.i);
      } else if (io.val->u.s) {
         ast_str_set(str, maxlen, "%s", io.val->u.s);
         free(io.val->u.s);
      }
      free(io.val);
   }
   return ast_str_strlen(*str);
}