Thu Jul 9 13:40:51 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, struct ast_channel *chan)


Detailed Description

???????
Todo:
Explain this file!

Definition in file ast_expr.h.


Function Documentation

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

Definition at line 2382 of file ast_expr2f.c.

02383 {
02384    struct parse_io io;
02385    int return_value = 0;
02386    
02387    memset(&io, 0, sizeof(io));
02388    io.string = expr;  /* to pass to the error routine */
02389    io.chan = chan;
02390    
02391    ast_yylex_init(&io.scanner);
02392    
02393    ast_yy_scan_string(expr, io.scanner);
02394    
02395    ast_yyparse ((void *) &io);
02396 
02397    ast_yylex_destroy(io.scanner);
02398 
02399    if (!io.val) {
02400       if (length > 1) {
02401          strcpy(buf, "0");
02402          return_value = 1;
02403       }
02404    } else {
02405       if (io.val->type == AST_EXPR_number) {
02406          int res_length;
02407 
02408          res_length = snprintf(buf, length, FP___PRINTF, io.val->u.i);
02409          return_value = (res_length <= length) ? res_length : length;
02410       } else {
02411          if (io.val->u.s)
02412 #if defined(STANDALONE) || defined(LOW_MEMORY) || defined(STANDALONE)
02413             strncpy(buf, io.val->u.s, length - 1);
02414 #else /* !STANDALONE && !LOW_MEMORY */
02415             ast_copy_string(buf, io.val->u.s, length);
02416 #endif /* STANDALONE || LOW_MEMORY */
02417          else
02418             buf[0] = 0;
02419          return_value = strlen(buf);
02420          free(io.val->u.s);
02421       }
02422       free(io.val);
02423    }
02424    return return_value;
02425 }


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