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string.c
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string.c
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/*!
\file db/dbmi_base/string.c
\brief DBMI Library (base) - string management
(C) 1999-2009 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)
\author Upgraded to GRASS 5.7 by Radim Blazek
*/
#include <string.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
/*!
\brief Initialize dbString
\param[out] x pointer to dbString
*/
void db_init_string(dbString *x)
{
G_zero(x, sizeof(dbString));
}
static int set_string(dbString * x, char *s, int copy);
/*!
\brief Inserts string to dbString (enlarge string)
\param[in,out] x pointer to dbString
\param s string to be inserted
\return DB_OK on success
\return DB_MEMORY_ERR on error
*/
int db_set_string(dbString * x, const char *s)
{
return set_string(x, (char *)s, 1);
}
/*!
\brief Inserts string to dbString (overwrite current value)
\param[in,out] x pointer to dbString
\param s string to be inserted
\return DB_OK on success
\return DB_MEMORY_ERR on error
*/
int db_set_string_no_copy(dbString * x, char *s)
{
return set_string(x, s, 0);
}
/*!
\brief Get string size
\param x pointer to dbString
\return string size
*/
unsigned int db_sizeof_string(const dbString * x)
{
if (x->nalloc < 0)
return 0;
return (unsigned int)x->nalloc;
}
/*!
\brief Zero string
\param x pointer to dbString
*/
void db_zero_string(dbString * x)
{
if (db_get_string(x) && x->nalloc > 0)
db_zero((void *)db_get_string(x), x->nalloc);
}
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;
}
/*!
\brief Enlarge dbString
\param x pointer to dbString
\param len requested string size
\return DB_OK on success
\return DB_MEMORY_ERR on error
*/
int db_enlarge_string(dbString * x, int len)
{
if (x->nalloc < len) {
if (x->nalloc < 0)
x->string = NULL;
x->string = db_realloc((void *)x->string, len);
if (x->string == NULL)
return DB_MEMORY_ERR;
x->nalloc = len;
}
return DB_OK;
}
/*!
\brief Get string
\param x pointer to dbString
\return pointer to buffer containing string
*/
char *db_get_string(const dbString * x)
{
return x->string;
}
/*!
\brief Free allocated space for dbString
\param x pointer to dbString
*/
void db_free_string(dbString *x)
{
if (x->nalloc > 0)
db_free(x->string);
db_init_string(x);
}
/*!
\brief Free allocated dbString array
\param a pointer to 1st dbString in the array
\param n number of items in array
*/
void db_free_string_array(dbString *a, int n)
{
int i;
if (a) {
for (i = 0; i < n; i++)
db_free_string(&a[i]);
db_free(a);
}
}
/*!
\brief Allocate dbString array
\param count number of items to be allocated
\return pointer to 1st dbString in the array
*/
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;
}
/*!
\brief Append string to dbString
\param x pointer to dbString
\param s string to be appended
\return DB_OK on success
\return otherwise error code is returned
*/
int db_append_string(dbString * x, const char *s)
{
int len;
int stat;
if (!db_get_string(x))
return db_set_string(x, s);
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;
}
/*!
\brief Copy dbString
\param dst destination dbString
\param src source dbString
\return DB_OK on success
\return DB_ERR code on error
*/
int db_copy_string(dbString * dst, const dbString * src)
{
return db_set_string(dst, db_get_string(src));
}
/*!
\brief Replace each ' is replaced by ''
\param src pointer to dbString
*/
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);
}