Thu Feb 5 16:25:58 2009

Asterisk developer's documentation


ast_expr.h File Reference

Go to the source code of this file.

Functions

int ast_expr (char *expr, char *buf, int length)


Function Documentation

int ast_expr ( char *  expr,
char *  buf,
int  length 
)

Definition at line 3159 of file ast_expr2f.c.

03160 {
03161    struct parse_io io;
03162    int return_value = 0;
03163    
03164    memset(&io, 0, sizeof(io));
03165    io.string = expr;  /* to pass to the error routine */
03166    
03167    ast_yylex_init(&io.scanner);
03168    
03169    ast_yy_scan_string(expr, io.scanner);
03170    
03171    ast_yyparse ((void *) &io);
03172 
03173    ast_yylex_destroy(io.scanner);
03174 
03175    if (!io.val) {
03176       if (length > 1) {
03177          strcpy(buf, "0");
03178          return_value = 1;
03179       }
03180    } else {
03181       if (io.val->type == AST_EXPR_integer) {
03182          int res_length;
03183 
03184          res_length = snprintf(buf, length, "%ld", (long int) io.val->u.i);
03185          return_value = (res_length <= length) ? res_length : length;
03186       } else {
03187 #if defined(STANDALONE) || defined(LOW_MEMORY) || defined(STANDALONE_AEL)
03188          strncpy(buf, io.val->u.s, length - 1);
03189 #else /* !STANDALONE && !LOW_MEMORY */
03190          ast_copy_string(buf, io.val->u.s, length);
03191 #endif /* STANDALONE || LOW_MEMORY */
03192          return_value = strlen(buf);
03193          free(io.val->u.s);
03194       }
03195       free(io.val);
03196    }
03197    return return_value;
03198 }


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