d_error.c

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/*!
   \file lib/db/dbmi_driver/d_error.c
 
   \brief DBMI Library (driver) - error reporting
 
   Taken from DB drivers.
 
   SPDX-FileCopyrightText: 1999-2008, 2012 GRASS Development Team
   SPDX-License-Identifier: GPL-2.0-or-later
 
   \author Joel Jones (CERL/UIUC)
   \author Radim Blazek
   \author Adopted for DBMI by Martin Landa <landa.martin@gmail.com>
 */
 
#include <string.h>
#include <errno.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
 
/* initialize the global struct */
struct error_state {
    char *driver_name;
    dbString *errMsg;
};
 
static struct error_state state;
static struct error_state *st = &state;
 
static void init(void)
{
    db_set_string(st->errMsg, "");
    db_d_append_error(_("DBMI-%s driver error:"), st->driver_name);
    db_append_string(st->errMsg, "\n");
}
 
/*!
   \brief Init error message for DB driver
 
   Initialize prefix
 
   \param name driver name (eg. "SQLite"))
 */
void db_d_init_error(const char *name)
{
    if (!st->errMsg) {
        st->errMsg = (dbString *)G_malloc(sizeof(dbString));
        db_init_string(st->errMsg);
    }
 
    G_debug(1, "db_d_init_error(): %s", name);
 
    st->driver_name = G_malloc(strlen(name) + 1);
    strcpy(st->driver_name, name);
    init();
}
 
/*!
   \brief Append error message for DB driver
 
   \param fmt formatted message
 */
void db_d_append_error(const char *fmt, ...)
{
    FILE *fp = NULL;
    char *work = NULL;
    int count = 0;
    va_list ap;
 
    va_start(ap, fmt);
    if ((fp = tmpfile())) {
        count = vfprintf(fp, fmt, ap);
        if (count >= 0 && (work = G_calloc(count + 1, 1))) {
            rewind(fp);
            if (fread(work, 1, count, fp) != (size_t)count) {
                if (ferror(fp))
                    G_fatal_error(_("DBMI-%s driver file reading error: %s"),
                                  st->driver_name, strerror(errno));
            }
            db_append_string(st->errMsg, work);
            G_free(work);
        }
        fclose(fp);
    }
    va_end(ap);
}
 
/*!
   \brief Report error message for DB driver
 */
void db_d_report_error(void)
{
    db_append_string(st->errMsg, "\n");
    db_error(db_get_string(st->errMsg));
 
    init();
}