Tue Sep 30 01:19:44 2008

Asterisk developer's documentation


ast_expr.h File Reference

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Functions

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


Function Documentation

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

Definition at line 2288 of file ast_expr2f.c.

02289 {
02290    struct parse_io io;
02291    int return_value = 0;
02292    
02293    memset(&io, 0, sizeof(io));
02294    io.string = expr;  /* to pass to the error routine */
02295    
02296    ast_yylex_init(&io.scanner);
02297    
02298    ast_yy_scan_string(expr, io.scanner);
02299    
02300    ast_yyparse ((void *) &io);
02301 
02302    ast_yylex_destroy(io.scanner);
02303 
02304    if (!io.val) {
02305       if (length > 1) {
02306          strcpy(buf, "0");
02307          return_value = 1;
02308       }
02309    } else {
02310       if (io.val->type == AST_EXPR_integer) {
02311          int res_length;
02312 
02313          res_length = snprintf(buf, length, "%ld", (long int) io.val->u.i);
02314          return_value = (res_length <= length) ? res_length : length;
02315       } else {
02316 #if defined(STANDALONE) || defined(LOW_MEMORY) || defined(STANDALONE_AEL)
02317          strncpy(buf, io.val->u.s, length - 1);
02318 #else /* !STANDALONE && !LOW_MEMORY */
02319          ast_copy_string(buf, io.val->u.s, length);
02320 #endif /* STANDALONE || LOW_MEMORY */
02321          return_value = strlen(buf);
02322          free(io.val->u.s);
02323       }
02324       free(io.val);
02325    }
02326    return return_value;
02327 }


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