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|
%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file dk4dbit8.h Text in database.
*/
#ifndef DK4DBI_H_INCLUDED
#include <dk4dbi.h>
#endif
/** Traverse simple database containing text.
@param obj Object to modify during traversal.
@param k Key text.
@param v Value text.
@return 1 on success, 0 on error (continue traversal),
-1 on error (abort).
*/
typedef
int
dk4dbi_c8_traverse_fct_t(
void *obj,
const char *k,
const char *v
);
#ifdef __cplusplus
extern "C" {
#endif
/** Set text entry.
@param db Database to modify.
@param k Key text.
@param v Value text.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if db, k or vis NULL,
- DK4_E_SYNTAX<br>
if the database was opened read-only or k or v
is too long.
- DK4_E_MATH_OVERFLOW<br>
on numeric overflow in size calculation,
- DK4_E_NOT_SUPPORTED<br>
if db indicates an unsupported backend,
- DK4_E_NOT_FOUND<br>
if no record to delete was found,
- DK4_E_MEMORY_ALLOCATION_FAILED<br>
with mem.elsize and mem.nelem
set if there is not enough memory available,
- DK4_E_WRITE_FAILED<br>
if modification of the database failed.
*/
int
dk4dbi_c8_set(
dk4_dbi_t *db,
const char *k,
const char *v,
dk4_er_t *erp
);
/** Retrieve text entry.
@param db Database to query.
@param k Key text.
@param vbuf Result buffer address.
@param vsz Pointer to size variable (in: size, out: used).
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if db, k or vbufis NULL or vsz is 0,
or the length of k exceeds the key size limit,
- DK4_E_MATH_OVERFLOW<br>
on numeric overflow in size calculation,
- DK4_E_NOT_SUPPORTED<br>
if db indicates an unsupported backend,
- DK4_E_NOT_FOUND<br>
if no record was found for the key,
- DK4_E_BUFFER_TOO_SMALL<br>
if the destination buffer is too small.
*/
int
dk4dbi_c8_get(
dk4_dbi_t *db,
const char *k,
char *vbuf,
size_t vsz,
dk4_er_t *erp
);
/** Delete text entry.
@param db Database to modify.
@param k Key text.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if db or k is NULL,
- DK4_E_SYNTAX<br>
if the database is opened read-only or the length of
k exceeds the key size limit,
- DK4_E_MATH_OVERFLOW<br>
on numeric overflow in size calculation,
- DK4_E_NOT_SUPPORTED<br>
if db indicates an unsupported backend,
- DK4_E_WRITE_FAILED<br>
if modification of the database failed,
- DK4_E_NOT_FOUND<br>
if no record for the specified key is in the database.
*/
int
dk4dbi_c8_del(
dk4_dbi_t *db,
const char *k,
dk4_er_t *erp
);
/** Traverse database, apply function to all text entries.
@param db Database to traverse.
@param obj Object to modify during traversal.
@param fct Function to apply to all text entries.
@return 1 on success, 0 on error (database traversed),
-1 on error (traversal aborted).
*/
int
dk4dbi_c8_traverse(
dk4_dbi_t *db,
void *obj,
dk4dbi_c8_traverse_fct_t *fct
);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#include "dk4str8.h"
#include "dk4dbit8.h"
#include "dk4maasz.h"
$!trace-include
/** Object for database traversal.
*/
typedef struct {
void *obj; /**< Object for string traversal. */
dk4dbi_c8_traverse_fct_t *fct; /**< String traversal function. */
} dk4dbi_c8_traversal_object_t;
int
dk4dbi_c8_del(
dk4_dbi_t *db,
const char *k,
dk4_er_t *erp
)
{
dk4_er_t er; /* Internal error report for size calc */
size_t ks = 0; /* Key size */
int back = 0;
$? "+ dk4dbi_c8_del \"%!8s\"", TR_8STR(k)
if ((NULL != db) && (NULL != k)) {
dk4error_init(&er);
ks = dk4ma_size_t_add(1, dk4str8_len(k), &er);
if (DK4_E_NONE == er.ec) {
back = dk4dbi_delete(db, k, ks, erp);
} else {
dk4error_copy(erp, &er);
}
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
} $? "- dk4dbi_c8_del %d", back
return back;
}
int
dk4dbi_c8_set(
dk4_dbi_t *db,
const char *k,
const char *v,
dk4_er_t *erp
)
{
dk4_er_t er; /* Internal error report for size calc */
size_t ks = 0; /* Key size */
size_t vs = 0; /* Value size */
int back = 0;
$? "+ dk4dbi_c8_set \"%!8s\"=\"%!8s\"", TR_8STR(k), TR_8STR(v)
if ((NULL != db) && (NULL != k)) { $? ". args ok"
if (NULL != v) { $? ". new value"
dk4error_init(&er);
ks = dk4ma_size_t_add(1, dk4str8_len(k), &er);
vs = dk4ma_size_t_add(1, dk4str8_len(v), &er);
if (DK4_E_NONE == er.ec) { $? ". lengths ok"
back = dk4dbi_set(db, k, ks, v, vs, erp);
} else { $? "! key or value too long"
dk4error_copy(erp, &er);
}
} else { $? ". delete"
back = dk4dbi_c8_del(db, k, erp);
}
} else { $? "! args"
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
} $? "- dk4dbi_c8_set %d", back
return back;
}
int
dk4dbi_c8_get(
dk4_dbi_t *db,
const char *k,
char *vbuf,
size_t vsz,
dk4_er_t *erp
)
{
dk4_er_t er; /* Internal error report for size calc */
size_t ks = 0; /* Key size */
size_t ressz = 0; /* Result size */
int back = 0;
$? "+ dk4dbi_c8_get \"%!8s\"", TR_8STR(k)
if ((NULL != vbuf) && (0 < vsz)) { *vbuf = '\0'; }
if ((NULL != db) && (NULL != k) && (NULL != vbuf) && (0 < vsz)) {
dk4error_init(&er); $? ". args ok"
ressz = vsz;
ks = dk4ma_size_t_add(1, dk4str8_len(k), &er);
if (DK4_E_NONE == er.ec) { $? ". name length ok"
if (0 != dk4dbi_get(db, k, ks, vbuf, &ressz, erp)) { $? ". found"
if (0 < ressz) { $? ". length ok"
if ('\0' == vbuf[ressz - 1]) {
back = 1; $? ". result=\"%!8s\"", vbuf
} else {
if (ressz < vsz) {
vbuf[ressz] = '\0';
back = 1; $? ". result=\"%!8s\"", vbuf
} else { $? "! not terminated, too long"
*vbuf = '\0';
dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
}
}
} else { $? "! zero length"
*vbuf = '\0';
dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
}
}
#if TRACE_DEBUG
else { $? "! not found"
}
#endif
} else { $? "! name too long"
dk4error_copy(erp, &er);
}
} else { $? "! args"
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
} $? "- dk4dbi_c8_get %d", back
return back;
}
/** Function to traverse a simple database.
The function must check the kb, ks, vb and vs arguments
for validity, they are passed as found by the backend
functions (this means pointers may be NULL, sizes may be 0).
@param Object modified during traversal, may be NULL.
@param kb Key data.
@param ks Key size.
@param vb Value data.
@param vs Value size.
@return 1 on success, 0 on error (can continue), -1 on error (abort).
*/
static
int
dk4dbi_c8_internal_traverse(
void *obj,
const void *kb,
size_t ks,
const void *vb,
size_t vs
)
{
dk4dbi_c8_traversal_object_t *myobj; /* Passed from dk4dbi_traverse() */
const char *pk; /* Key pointer */
const char *pv; /* Value pointer */
int back = 0;
$? "+ dk4dbi_c8_internal_traverse"
if ((NULL != obj) && (NULL != kb) && (NULL != vb) && (0 < ks) && (0 < vs)) {
pk = (const char *)kb;
pv = (const char *)vb;
if (('\0' == pk[ks - 1]) && ('\0' == pv[vs - 1])) {
myobj = (dk4dbi_c8_traversal_object_t *)obj;
back = (*(myobj->fct))(myobj->obj, pk, pv);
}
} $? "- dk4dbi_c8_internal_traverse %d", back
return back;
}
int
dk4dbi_c8_traverse(
dk4_dbi_t *db,
void *obj,
dk4dbi_c8_traverse_fct_t *fct
)
{
dk4dbi_c8_traversal_object_t myobj; /* Passed to dk4dbi_traverse */
int back = -1;
$? "+ dk4dbi_c8_traverse db=%d obj=%d", TR_IPTR(db), TR_IPTR(obj)
if ((NULL != db) && (NULL != fct)) {
myobj.obj = obj;
myobj.fct = fct;
back = dk4dbi_traverse(db, &myobj, dk4dbi_c8_internal_traverse);
} $? "- dk4dbi_c8_traverse %d", back
return back;
}
|