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polardbxengine/mysys/typelib.cc

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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/typelib.cc
Functions to handle typelib
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include "m_ctype.h"
#include "m_string.h"
#include "my_alloc.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_macros.h"
#include "my_sys.h"
#include "typelib.h"
#define is_field_separator(X) ((X) == ',' || (X) == '=')
int find_type_or_exit(const char *x, TYPELIB *typelib, const char *option) {
int res;
const char **ptr;
if ((res = find_type(x, typelib, FIND_TYPE_BASIC)) <= 0) {
ptr = typelib->type_names;
if (!*x)
fprintf(stderr, "No option given to %s\n", option);
else
fprintf(stderr, "Unknown option to %s: %s\n", option, x);
fprintf(stderr, "Alternatives are: '%s'", *ptr);
while (*++ptr) fprintf(stderr, ",'%s'", *ptr);
fprintf(stderr, "\n");
exit(1);
}
return res;
}
/**
Search after a string in a list of strings. Endspace in x is not compared.
@param x String to find
@param typelib TYPELIB (struct of pointer to values + count)
@param flags flags to tune behaviour: a combination of
FIND_TYPE_NO_PREFIX
FIND_TYPE_ALLOW_NUMBER
FIND_TYPE_COMMA_TERM.
FIND_TYPE_NO_OVERWRITE can be passed but is
superfluous (is always implicitely on).
@retval
-1 Too many matching values
@retval
0 No matching value
@retval
>0 Offset+1 in typelib for matched string
*/
int find_type(const char *x, const TYPELIB *typelib, uint flags) {
int find, pos;
int findpos = 0; /* guarded by find */
const char *i;
const char *j;
DBUG_TRACE;
DBUG_PRINT("enter", ("x: '%s' lib: %p", x, typelib));
DBUG_ASSERT(!(flags & ~(FIND_TYPE_NO_PREFIX | FIND_TYPE_ALLOW_NUMBER |
FIND_TYPE_NO_OVERWRITE | FIND_TYPE_COMMA_TERM)));
if (!typelib->count) {
DBUG_PRINT("exit", ("no count"));
return 0;
}
find = 0;
for (pos = 0; (j = typelib->type_names[pos]); pos++) {
for (i = x;
*i && (!(flags & FIND_TYPE_COMMA_TERM) || !is_field_separator(*i)) &&
my_toupper(&my_charset_latin1, *i) ==
my_toupper(&my_charset_latin1, *j);
i++, j++)
;
if (!*j) {
while (*i == ' ') i++; /* skip_end_space */
if (!*i || ((flags & FIND_TYPE_COMMA_TERM) && is_field_separator(*i)))
return pos + 1;
}
if ((!*i && (!(flags & FIND_TYPE_COMMA_TERM) || !is_field_separator(*i))) &&
(!*j || !(flags & FIND_TYPE_NO_PREFIX))) {
find++;
findpos = pos;
}
}
if (find == 0 && (flags & FIND_TYPE_ALLOW_NUMBER) && x[0] == '#' &&
strend(x)[-1] == '#' && (findpos = atoi(x + 1) - 1) >= 0 &&
(uint)findpos < typelib->count)
find = 1;
else if (find == 0 || !x[0]) {
DBUG_PRINT("exit", ("Couldn't find type"));
return 0;
} else if (find != 1 || (flags & FIND_TYPE_NO_PREFIX)) {
DBUG_PRINT("exit", ("Too many possybilities"));
return -1;
}
return findpos + 1;
} /* find_type */
/**
Get name of type nr
@note
first type is 1, 0 = empty field
*/
void make_type(char *to, uint nr, TYPELIB *typelib) {
DBUG_TRACE;
if (!nr)
to[0] = 0;
else
(void)my_stpcpy(to, get_type(typelib, nr - 1));
} /* make_type */
/**
Get type
@note
first type is 0
*/
const char *get_type(TYPELIB *typelib, uint nr) {
if (nr < (uint)typelib->count && typelib->type_names)
return (typelib->type_names[nr]);
return "?";
}
/**
Create an integer value to represent the supplied comma-seperated
string where each string in the TYPELIB denotes a bit position.
@param x string to decompose
@param lib TYPELIB (struct of pointer to values + count)
@param err index (not char position) of string element which was not
found or 0 if there was no error
@retval
a integer representation of the supplied string
*/
uint64_t find_typeset(const char *x, TYPELIB *lib, int *err) {
uint64_t result;
int find;
const char *i;
DBUG_TRACE;
DBUG_PRINT("enter", ("x: '%s' lib: %p", x, lib));
if (!lib->count) {
DBUG_PRINT("exit", ("no count"));
return 0;
}
result = 0;
*err = 0;
while (*x) {
(*err)++;
i = x;
while (*x && !is_field_separator(*x)) x++;
if (x[0] && x[1]) /* skip separator if found */
x++;
if ((find = find_type(i, lib, FIND_TYPE_COMMA_TERM) - 1) < 0) return 0;
result |= (1ULL << find);
}
*err = 0;
return result;
} /* find_set */
/**
Create a copy of a specified TYPELIB structure.
@param root pointer to a MEM_ROOT object for allocations
@param from pointer to a source TYPELIB structure
@retval
pointer to the new TYPELIB structure on successful copy
@retval
NULL otherwise
*/
TYPELIB *copy_typelib(MEM_ROOT *root, TYPELIB *from) {
TYPELIB *to;
uint i;
if (!from) return NULL;
if (!(to = (TYPELIB *)root->Alloc(sizeof(TYPELIB)))) return NULL;
if (!(to->type_names = (const char **)root->Alloc(
(sizeof(char *) + sizeof(int)) * (from->count + 1))))
return NULL;
to->type_lengths = (unsigned int *)(to->type_names + from->count + 1);
to->count = from->count;
if (from->name) {
if (!(to->name = strdup_root(root, from->name))) return NULL;
} else
to->name = NULL;
for (i = 0; i < from->count; i++) {
if (!(to->type_names[i] =
strmake_root(root, from->type_names[i], from->type_lengths[i])))
return NULL;
to->type_lengths[i] = from->type_lengths[i];
}
to->type_names[to->count] = NULL;
to->type_lengths[to->count] = 0;
return to;
}
static const char *on_off_default_names[] = {"off", "on", "default", 0};
static TYPELIB on_off_default_typelib = {
array_elements(on_off_default_names) - 1, "", on_off_default_names, 0};
/**
Parse a TYPELIB name from the buffer
@param lib Set of names to scan for.
@param strpos INOUT Start of the buffer (updated to point to the next
character after the name)
@param end End of the buffer
@note
The buffer is assumed to contain one of the names specified in the TYPELIB,
followed by comma, '=', or end of the buffer.
@retval
0 No matching name
@retval
>0 Offset+1 in typelib for matched name
*/
static uint parse_name(const TYPELIB *lib, const char **strpos,
const char *end) {
const char *pos = *strpos;
uint find = find_type(pos, lib, FIND_TYPE_COMMA_TERM);
for (; pos != end && *pos != '=' && *pos != ','; pos++)
;
*strpos = pos;
return find;
}
/**
Parse and apply a set of flag assingments
@param lib Flag names
@param default_name Number of "default" in the typelib
@param cur_set Current set of flags (start from this state)
@param default_set Default set of flags (use this for assign-default
keyword and flag=default assignments)
@param str String to be parsed
@param length Length of the string
@param err_pos OUT If error, set to point to start of wrong set string
NULL on success
@param err_len OUT If error, set to the length of wrong set string
@details
Parse a set of flag assignments, that is, parse a string in form:
param_name1=value1,param_name2=value2,...
where the names are specified in the TYPELIB, and each value can be
either 'on','off', or 'default'. Setting the same name twice is not
allowed.
Besides param=val assignments, we support the "default" keyword (keyword
default_name in the typelib). It can be used one time, if specified it
causes us to build the new set over the default_set rather than cur_set
value.
@note
it's not charset aware
@retval
Parsed set value if (*errpos == NULL), otherwise undefined
*/
uint64_t find_set_from_flags(const TYPELIB *lib, size_t default_name,
uint64_t cur_set, uint64_t default_set,
const char *str, uint length, const char **err_pos,
uint *err_len) {
const char *end = str + length;
uint64_t flags_to_set = 0, flags_to_clear = 0, res;
bool set_defaults = 0;
*err_pos = 0; /* No error yet */
if (str != end) {
const char *start = str;
for (;;) {
const char *pos = start;
uint flag_no, value;
if (!(flag_no = parse_name(lib, &pos, end))) goto err;
if (flag_no == default_name) {
/* Using 'default' twice isn't allowed. */
if (set_defaults) goto err;
set_defaults = true;
} else {
uint64_t bit = (1ULL << (flag_no - 1));
/* parse the '=on|off|default' */
if ((flags_to_clear | flags_to_set) & bit || pos >= end ||
*pos++ != '=' ||
!(value = parse_name(&on_off_default_typelib, &pos, end)))
goto err;
if (value == 1) /* this is '=off' */
flags_to_clear |= bit;
else if (value == 2) /* this is '=on' */
flags_to_set |= bit;
else /* this is '=default' */
{
if (default_set & bit)
flags_to_set |= bit;
else
flags_to_clear |= bit;
}
}
if (pos >= end) break;
if (*pos++ != ',') goto err;
start = pos;
continue;
err:
*err_pos = start;
*err_len = (uint)(end - start);
break;
}
}
res = set_defaults ? default_set : cur_set;
res |= flags_to_set;
res &= ~flags_to_clear;
return res;
}
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