Geografic-Information-System/lib/db/dbmi_base/string.c

#include <string.h>
#include <stdlib.h>
#include <grass/dbmi.h>

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
void
db_init_string  (dbString *x)

{
    x->string = "";
    x->nalloc = 0;
}



/*!
 \fn 
 \brief 
 \return 
 \param 
*/
/* db_set_string(dbString *x, char *s, int copy)
 *  inserts 's' into 'x'
 *   if 'copy' is true, then memory is allocated to copy into
 *   else 'x' is made to point to 's'
 * returns DB_OK or DB_MEMORY_ERR
 */
static int set_string(dbString *x, char *s, int  copy);

int
db_set_string  (dbString *x, const char *s)

{
    return set_string (x, (char *) s, 1);
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
int 
db_set_string_no_copy  (dbString *x, char *s)

{
    return set_string (x, s, 0);
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
unsigned int
db_sizeof_string  (dbString *x)

{
    if (x->nalloc < 0) return 0;
    return (unsigned int) x->nalloc;
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
void
db_zero_string  (dbString *x)

{
    db_zero ((void *)db_get_string(x), db_sizeof_string(x));
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
static int
set_string  (dbString *x, char *s, int  copy)

{
    int len;
    int stat;

    if (s == NULL)
    {
	s = "";
	copy = 1;
    }

    len = strlen(s)+1;

    if (copy)
    {
	stat = db_enlarge_string (x, len);
	if (stat != DB_OK)
	    return stat;
	strcpy (x->string, s);
    }
    else
    {
	db_free_string(x);
	x->string = s;
	x->nalloc = -1;
    }
    return DB_OK;
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
int
db_enlarge_string  (dbString *x, int len)

{
    if (x->nalloc < len)
    {
	if (x->nalloc <= 0)
	    x->string = db_store("");
	x->string = db_realloc ((void *)x->string, len);
	if (x->string == NULL)
	    return DB_MEMORY_ERR;
	x->nalloc = len;
    }
    return DB_OK;
}

/*!
 \fn
 \brief
 \return
 \param
*/

char *
db_get_string (dbString *x)

{
    return x->string;
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
void
db_free_string (dbString *x)

{	
    if (x->nalloc > 0)
	free(x->string);
    db_init_string (x);
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
void
db_free_string_array  (dbString *a, int  n)

{
    int i;

    if (a)
    {
	for (i = 0; i<n; i++)
	    db_free_string(&a[i]);
	free (a);
    }
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
dbString *
db_alloc_string_array  (int count)

{
    int i;
    dbString *a;

    if (count < 0) count = 0;
    a = (dbString *) db_calloc (count, sizeof(dbString));
    if (a)
    {
	for (i = 0; i < count; i++)
	    db_init_string(&a[i]);
    }
    return a;
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
int
db_append_string  (dbString *x, const char *s)

{
    int len;
    int stat;

    len = strlen (db_get_string(x)) + strlen(s) + 1;
    stat = db_enlarge_string (x, len);
    if (stat != DB_OK)
	return stat;
    strcat (db_get_string(x), s);
    return DB_OK;
}

/*!
 \fn 
 \brief 
 \return 
 \param 
*/
int
db_copy_string  (dbString *dst, dbString *src)

{
    return db_set_string (dst, db_get_string(src));
}

/*!
 \fn 
 \brief each ' is replaced by ''
 \return 
 \param 
*/
void
db_double_quote_string  (dbString *src)

{
    char *ptra, *ptrb, buf[2];
    dbString tmp;
    
    db_init_string (&tmp);
    buf[1] = 0;
    
    ptrb = db_get_string(src);
    while ( (ptra = strchr( ptrb, '\'') ) != NULL ) {
	for ( ; ptrb <= ptra; ptrb++ ) { buf[0] = ptrb[0]; db_append_string (&tmp, buf); }
        db_append_string (&tmp, "'");
    }
    db_append_string (&tmp, ptrb );
    db_set_string ( src, db_get_string(&tmp));
    db_free_string( &tmp );
}