xdrstring.c

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/*!
   \file lib/db/dbmi_base/xdrstring.c
 
   \brief DBMI Library (base) - external data representation (string)
 
   (C) 1999-2009, 2011 by the GRASS Development Team
 
   This program is free software under the GNU General Public License
   (>=v2). Read the file COPYING that comes with GRASS for details.
 
   \author Joel Jones (CERL/UIUC), Radim Blazek, Brad Douglas, Markus Neteler
   \author Doxygenized by Martin Landa <landa.martin gmail.com> (2011)
 */
 
#include <string.h>
#include "xdr.h"
 
/*!
   \brief Send string array
 
   \param a
   \param count
 
   \return
 */
int db__send_string_array(dbString *a, int count)
{
    int i;
    int stat;
 
    stat = db__send_int(count);
    for (i = 0; stat == DB_OK && i < count; i++)
        stat = db__send_string(&a[i]);
 
    return stat;
}
 
/*!
   \brief Receive string array
 
   \param a
   \param n
 
   \return
 */
int db__recv_string_array(dbString **a, int *n)
{
    int i, count;
    int stat;
    dbString *b;
 
    *n = 0;
    *a = NULL;
    stat = db__recv_int(&count);
    if (stat != DB_OK)
        return stat;
    if (count < 0) {
        db_protocol_error();
        return DB_PROTOCOL_ERR;
    }
 
    b = db_alloc_string_array(count);
    if (b == NULL)
        return DB_MEMORY_ERR;
 
    for (i = 0; i < count; i++) {
        stat = db__recv_string(&b[i]);
        if (stat != DB_OK) {
            db_free_string_array(b, count);
            return stat;
        }
    }
    *n = count;
    *a = b;
 
    return DB_OK;
}
 
/*!
   \brief Send string
 
   \param x
 
   \return
 */
int db__send_string(dbString *x)
{
    int stat = DB_OK;
    const char *s = db_get_string(x);
    int len = s ? strlen(s) + 1 : 1;
 
    if (!s)
        s = ""; /* don't send a NULL string */
 
    if (!db__send(&len, sizeof(len)))
        stat = DB_PROTOCOL_ERR;
 
    if (!db__send(s, len))
        stat = DB_PROTOCOL_ERR;
 
    if (stat == DB_PROTOCOL_ERR)
        db_protocol_error();
 
    return stat;
}
 
/*!
   \brief Reads a string from transport
 
   Note: caller MUST initialize x by calling db_init_string()
 
   \param x
 
   \return DB_OK, DB_MEMORY_ERR, or DB_PROTOCOL_ERR
   \return NULL if error
 */
int db__recv_string(dbString *x)
{
    int stat = DB_OK;
    int len;
    char *s;
 
    if (!db__recv(&len, sizeof(len)))
        stat = DB_PROTOCOL_ERR;
 
    if (len <= 0) /* len will include the null byte */
        stat = DB_PROTOCOL_ERR;
 
    if (db_enlarge_string(x, len) != DB_OK)
        stat = DB_PROTOCOL_ERR;
 
    s = db_get_string(x);
 
    if (!db__recv(s, len))
        stat = DB_PROTOCOL_ERR;
 
    if (stat == DB_PROTOCOL_ERR)
        db_protocol_error();
 
    return stat;
}
 
/*!
   \brief Send C string
 
   \param s
 
   \return
 */
int db__send_Cstring(const char *s)
{
    dbString x;
 
    db_init_string(&x);
    db_set_string_no_copy(&x, (char *)s);
 
    return db__send_string(&x);
}