https://github.com/oracle/odpi/issues/67

oranum-from-test-overun.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dpi.h>

static dpiContext *g_context;

#define chkerr(func) do { \
    if ((func) < 0) { \
        dpiErrorInfo err; \
        dpiContext_getError(g_context, &err); \
        printf("ERROR at line %d\n  %s\n  %s\n", __LINE__, #func, err.message); \
        exit(1); \
    } \
} while (0)

#define NUM_ATTRS 12

static const char *env(const char *name, const char *default_value)
{
    const char *value = getenv(name);
    if (value == NULL) {
        value = default_value;
    }
    return value;
}

int main()
{
    const char *username = env("ODPIC_SAMPLES_MAIN_USER", "odpicdemo");
    const char *password = env("ODPIC_SAMPLES_MAIN_PASSWORD", "welcome");
    const char *connectString = env("ODPIC_SAMPLES_CONNECT_STRING", "localhost/orclpdb");
    const char *sql = "begin :1 := :2; end;";
    const char *num_str = "-123456789012345678901234567890123456789";
    dpiErrorInfo err;
    dpiConn *conn;
    dpiStmt *stmt;
    dpiVar *var1, *var2;
    dpiData *data1, *data2;
    uint32_t numQueryColumns;
    uint32_t bufferRowIndex;
    int found;
    int i;

    if (dpiContext_create(DPI_MAJOR_VERSION, DPI_MINOR_VERSION, &g_context, &err) < 0) {
        printf("ERROR\n  dpiContext_create()\n %s\n", err.message);
        exit(1);
    }

    chkerr(dpiConn_create(g_context, username, strlen(username), password, strlen(password),
                           connectString, strlen(connectString), NULL, NULL, &conn));

    chkerr(dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_BYTES, 1, 0, 0, 0, NULL, &var1, &data1));
    chkerr(dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_BYTES, 1, 0, 0, 0, NULL, &var2, &data2));
    chkerr(dpiVar_setFromBytes(var2, 0, num_str, strlen(num_str)));

    chkerr(dpiConn_prepareStmt(conn, 0, sql, strlen(sql), NULL, 0, &stmt));
    chkerr(dpiStmt_bindByPos(stmt, 1, var1));
    chkerr(dpiStmt_bindByPos(stmt, 2, var2));
    chkerr(dpiStmt_execute(stmt, 0, &numQueryColumns));

    chkerr(dpiStmt_release(stmt));
    chkerr(dpiVar_release(var1));
    chkerr(dpiVar_release(var2));
    chkerr(dpiConn_release(conn));
    return 0;
}