FreeTDS Development Group

[David Nahman <vanyadog AT yahoo.com>]

Dear List,

This is probably not a problem with FreeTDS, but I'm
posting here in case it jogs a memory of a similar
occurance.

I'm building the current CVS snapshot under IRIX with
gcc with --disable-shared.  I am finding that
somewhere under tds_convert, after a certain number of
iterations, ctx->locale gets incorrectly freed or the
pointer gets overwritten, so that later when my
program segfaults in cs_ctx_drop.

The other problem here is that the remaining legacy
code that I'm working with here has to be compiled
with the MIPSPro Compiler V7.2.1.  I don't know if it
is a problem with the way the various compilers set up
the stack, or if there is something else going on.

Here is a sample of the inner loop of the code that is
causing the problem, if that sheds any info.  The
cscmd that is passed in has already been used for a
prior query, which has most likely not returned any
rows.

Thank you very much,
David


=====================
int GetDevByAlias(CS_COMMAND * cscmd, char * alias,
char * device)
{
        CS_DATAFMT      columns[6];
        CS_INT          datalength[6];
        CS_SMALLINT     indicator[6];
        CS_RETCODE      csresult_type;
        char query[VCL_MAXBUFSIZE];

        sprintf(query, "SELECT
control.dbo.Device.Device_Mnemonic FROM
cl.dbo.Aliases, control.dbo.Device WHERE
cl.dbo.Aliases.Alias = '%s' AND
cl.dbo.Aliases.DeviceID =
control.dbo.Device.Device_ID", alias); 

        if (ct_command(cscmd, CS_LANG_CMD, query,
CS_NULLTERM, CS_UNUSED) != CS_SUCCEED) {
                return 0;
        }
        
        if (ct_send(cscmd) != CS_SUCCEED) {
                
                return 0;
        }
        while (ct_results(cscmd, &csresult_type) ==
CS_SUCCEED) {
                switch (csresult_type){
                case CS_ROW_RESULT:
                        columns[0].datatype = CS_CHAR_TYPE;
                        columns[0].format = CS_FMT_NULLTERM;
                        columns[0].maxlength = NVL_DEVICE_MNEMONIC + 1;
                        columns[0].count = 1;
                        columns[0].locale = NULL;
                        if (ct_bind(cscmd, 1, &columns[0], device,
&datalength[0], &indicator[0]) != CS_SUCCEED) {
                                
                                return 0;
                        }

                        while (ct_fetch(cscmd, CS_UNUSED, CS_UNUSED,
CS_UNUSED, NULL) == CS_SUCCEED) {
                                ;
                        }
                        break;
                case CS_CMD_SUCCEED:
                        /* No rows returned */
                        return 0;
                        break;
                default:
                        ; /* ignore other messages */
                } /* switch */
        }
        
        return 1;


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