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lib_mysqludf_str.c
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lib_mysqludf_str.c
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/* -*- coding: utf-8; tab-width: 2; c-basic-offset: 2; indent-tabs-mode: t -*- */
/*
lib_mysqludf_str - a library of functions to work with strings
Copyright © 2013 Daniel Trebbien <dtrebbien@gmail.com>
Copyright © 2007 Claudio Cherubino <claudiocherubino@gmail.com>
web: http://www.mysqludf.org/lib_mysqludf_str/
Contributions by:
Galen Wright-Watson <https://github.com/outis>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <my_global.h>
#include <mysql.h>
#include <m_ctype.h>
#ifdef __WIN__
#ifndef _WIN64
#define SystemFunction036 NTAPI SystemFunction036
#endif
#include <ntsecapi.h>
#undef SystemFunction036
#else
#include <fcntl.h>
#include <unistd.h>
#endif
#include "config.h"
#include "char_vector.h"
#include "string_utils.h"
#ifdef __WIN__
#define DLLEXP __declspec(dllexport)
#else
#define DLLEXP
#endif
#ifdef __GNUC__
/* From Check: http://check.svn.sourceforge.net/viewvc/check/trunk/src/check.h.in?revision=HEAD
License: LGPL 2.1 or later */
#ifdef __GNUC_MINOR__
#define GCC_VERSION_AT_LEAST(major, minor) \
((__GNUC__ > (major)) || \
(__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
#else
#define GCC_VERSION_AT_LEAST(major, minor) 0
#endif /* __GNUC_MINOR__ */
#if GCC_VERSION_AT_LEAST(2, 95)
#define ATTRIBUTE_UNUSED __attribute__ ((unused))
#else
#define ATTRIBUTE_UNUSED
#endif
#else
#define ATTRIBUTE_UNUSED
#endif
#ifndef SIZE_MAX
#define SIZE_MAX ((size_t) -1)
#endif
#ifdef HAVE_DLOPEN
#define LIBVERSION ("lib_mysqludf_str version " PACKAGE_VERSION)
#define ROT_OFFSET 13
#define ARGCOUNTCHECK(typestr) \
if (args->arg_count != 1) { \
snprintf(message, MYSQL_ERRMSG_SIZE, "wrong argument count: %s requires one " typestr " argument, got %d arguments", funcname, args->arg_count); \
return 1; \
}
#define ARGTYPECHECK(arg, type, typestr) \
if (arg != type) { \
snprintf(message, MYSQL_ERRMSG_SIZE, "wrong argument type: %s requires one " typestr " argument. Expected type %d, got type %d.", funcname, type, arg); \
return 1; \
}
#define STRARGCHECK ARGTYPECHECK(args->arg_type[0], STRING_RESULT, "string")
#define INTARGCHECK ARGTYPECHECK(args->arg_type[0], INT_RESULT, "integer")
/******************************************************************************
** function declarations
******************************************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#define DECLARE_UDF_INIT_DEINIT(name_id) \
DLLEXP my_bool name_id ## _init(UDF_INIT *, UDF_ARGS *, char *); \
DLLEXP void name_id ## _deinit(UDF_INIT *);
#define DECLARE_STRING_UDF(name_id) \
DECLARE_UDF_INIT_DEINIT(name_id) \
DLLEXP char *name_id(UDF_INIT *, UDF_ARGS *, char *, unsigned long *, char *, char *);
DECLARE_STRING_UDF(lib_mysqludf_str_info)
DECLARE_STRING_UDF(str_numtowords)
DECLARE_STRING_UDF(str_rot13)
DECLARE_STRING_UDF(str_shuffle)
DECLARE_STRING_UDF(str_translate)
DECLARE_STRING_UDF(str_ucfirst)
DECLARE_STRING_UDF(str_ucwords)
DECLARE_STRING_UDF(str_xor)
DECLARE_STRING_UDF(str_srand)
#ifdef __cplusplus
}
#endif
/******************************************************************************
** function definitions
******************************************************************************/
/******************************************************************************
** purpose: called once for each SQL statement which invokes lib_mysqludf_str_info_init();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main lib_mysqludf_str_info_init() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (lib_mysqludf_str_info_init() and lib_mysqludf_str_info_init_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of lib_mysqludf_str_info_init(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool lib_mysqludf_str_info_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
if (args->arg_count != 0)
{
x_strlcpy(message, "No arguments allowed (udf: lib_mysqludf_str_info)", MYSQL_ERRMSG_SIZE);
return 1;
}
initid->maybe_null = 0;
initid->max_length = (sizeof LIBVERSION) - 1;
initid->const_item = 1;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by lib_mysqludf_str_info_init();
** this function is called once for each query which invokes
** lib_mysqludf_str_info(), it is called after all of the calls to
** lib_mysqludf_str_info() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** lib_mysqludf_str_info_init() and lib_mysqludf_str_info())
** returns: nothing
******************************************************************************/
void lib_mysqludf_str_info_deinit(UDF_INIT *initid ATTRIBUTE_UNUSED)
{
}
/******************************************************************************
** purpose: obtain information about the currently installed version
** of lib_mysqludf_str.
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the library version number
******************************************************************************/
char *lib_mysqludf_str_info(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
strcpy(result, LIBVERSION);
*res_length = (sizeof LIBVERSION) - 1;
return result;
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_numtowords();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_numtowords() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_numtowords() and str_numtowords_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_numtowords(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_numtowords_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_numtowords";
st_char_vector *vec;
/* make sure user has provided exactly one integer argument */
ARGCOUNTCHECK("integer");
INTARGCHECK;
vec = char_vector_alloc();
if (vec == NULL)
{
x_strlcpy(message, "char_vector_alloc() failed", MYSQL_ERRMSG_SIZE);
return 1;
}
initid->ptr = (char *) vec;
initid->maybe_null=1;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_numtowords_init(); this func
** is called once for each query which invokes str_numtowords(),
** it is called after all of the calls to str_numtowords() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_numtowords_init() and str_numtowords())
** returns: nothing
******************************************************************************/
void str_numtowords_deinit(UDF_INIT *initid)
{
st_char_vector *vec = (st_char_vector *) initid->ptr;
char_vector_free(vec);
}
#define STR_LENGTH(str) ((sizeof (str)) -1)
#define STR_COMMA_LENGTH(str_lit) str_lit, STR_LENGTH(str_lit)
/******************************************************************************
** purpose: convert numbers written in arabic digits to an english word.
** Works for positive and negative numbers up to 9 digits long.
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the string spelling the given number in English
******************************************************************************/
char *str_numtowords(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
static const char *const powers[] = {"thousand", "million", "billion", "trillion", "quadrillion", "quintillion", "sextillion", "septillion", "octillion", "nonillion", "decillion", "undecillion", "duodecillion"};
static const char *const ones[] = {"one", "two", "three", "four", "five",
"six", "seven", "eight", "nine", "ten",
"eleven", "twelve", "thirteen", "fourteen", "fifteen",
"sixteen", "seventeen", "eighteen", "nineteen"};
static const char *const tens[] = {"twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
st_char_vector *vec;
long long value;
int part_stack[14];
int *part_ptr;
if (args->args[0] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
vec = (st_char_vector *) initid->ptr;
value = *((long long *) args->args[0]);
part_ptr = part_stack;
assert(char_vector_length(vec) == 0);
// check for negative values or zero
if (value < 0)
{
char_vector_append(vec, STR_COMMA_LENGTH("negative "));
value = -value;
}
else if (value == 0)
{
char *tmp = "zero";
*res_length = STR_LENGTH("zero");
return tmp;
}
// splitting the number into its parts
for (; value; value /= 1000)
*part_ptr++ = value % 1000;
while (part_ptr > part_stack)
{
int p = *--part_ptr;
const int pWasNonzero = p != 0;
if (p >= 100)
{
char_vector_strcat(vec, ones[p / 100 - 1]);
char_vector_append(vec, STR_COMMA_LENGTH(" hundred "));
p %= 100;
}
if (p >= 20)
{
if (p % 10)
{
char_vector_strcat(vec, tens[p / 10 - 2]);
char_vector_append(vec, STR_COMMA_LENGTH("-"));
char_vector_strcat(vec, ones[p % 10 - 1]);
char_vector_append(vec, STR_COMMA_LENGTH(" "));
}
else
{
char_vector_strcat(vec, tens[p / 10 - 2]);
char_vector_append(vec, STR_COMMA_LENGTH(" "));
}
}
else if (p > 0)
{
char_vector_strcat(vec, ones[p - 1]);
char_vector_append(vec, STR_COMMA_LENGTH(" "));
}
if (pWasNonzero && part_ptr > part_stack)
{
char_vector_strcat(vec, powers[part_ptr - part_stack - 1]);
char_vector_append(vec, STR_COMMA_LENGTH(" "));
}
}
*res_length = char_vector_length(vec) - 1;
return char_vector_get_ptr(vec);
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_rot13();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_rot13() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_rot13() and str_rot13_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_rot13(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_rot13_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_rot13";
unsigned long res_length;
/* make sure user has provided exactly one string argument */
ARGCOUNTCHECK("string");
STRARGCHECK;
res_length = args->lengths[0];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{
char *tmp = (char *) malloc((size_t) res_length); /* This is a safe cast because res_length <= SIZE_MAX. */
if (tmp == NULL)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "malloc() failed to allocate %zu bytes of memory", (size_t) res_length);
return 1;
}
initid->ptr = tmp;
}
initid->maybe_null = 1;
initid->max_length = res_length;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_rot13_init(); this func
** is called once for each query which invokes str_rot13(),
** it is called after all of the calls to str_rot13() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_rot13_init() and str_rot13())
** returns: nothing
******************************************************************************/
void str_rot13_deinit(UDF_INIT *initid)
{
if (initid->ptr != NULL)
free(initid->ptr);
}
/******************************************************************************
** purpose: perform the rot13 transform on a string, shifting each
** character by 13 places in the alphabet, and wrapping back
** to the beginning if necessary.
** Non-alphabetic character will not be modified.
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the string transformed by str_rot13
******************************************************************************/
char *str_rot13(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
int i, cod_ascii;
const char *s;
if (args->args[0] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
// s will contain the user-supplied argument
s = args->args[0];
if (initid->ptr != NULL)
{
result = initid->ptr;
}
*res_length = args->lengths[0];
for (i = 0; i < *res_length; i++)
{
// cod_ascii is an integer containing the ascii code of a single character
cod_ascii = s[i];
if(cod_ascii >= 97 && cod_ascii <= 122) // lower case character
{
cod_ascii += ROT_OFFSET;
if(cod_ascii>122)
cod_ascii = 96 + (cod_ascii-122);
}
else if(cod_ascii >= 65 && cod_ascii <= 90) // upper case character
{
cod_ascii += ROT_OFFSET;
if(cod_ascii>90)
cod_ascii = 64 + (cod_ascii-90);
}
result[i] = cod_ascii;
}
return result;
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_shuffle();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_shuffle() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_shuffle() and str_shuffle_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_shuffle(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_shuffle_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_shuffle";
unsigned long res_length;
/* make sure user has provided exactly one string argument */
ARGCOUNTCHECK("string");
STRARGCHECK;
res_length = args->lengths[0];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{
char *tmp = (char *) malloc((size_t) res_length); /* This is a safe cast because res_length <= SIZE_MAX. */
if (tmp == NULL)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "malloc() failed to allocate %zu bytes of memory", (size_t) res_length);
return 1;
}
initid->ptr = tmp;
}
initid->maybe_null = 1;
initid->max_length = res_length;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_shuffle_init(); this func
** is called once for each query which invokes str_shuffle(),
** it is called after all of the calls to str_shuffle() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_shuffle_init() and str_shuffle())
** returns: nothing
******************************************************************************/
void str_shuffle_deinit(UDF_INIT *initid ATTRIBUTE_UNUSED)
{
if (initid->ptr != NULL)
free(initid->ptr);
}
/******************************************************************************
** purpose: randomly shuffle the characters of a string
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: one of the possible permutations of the original string
******************************************************************************/
char *str_shuffle(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
int i, j;
char swp;
if (args->args[0] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
if (initid->ptr != NULL)
{
result = initid->ptr;
}
// copy the argument string into result
memcpy(result, args->args[0], args->lengths[0]);
*res_length = args->lengths[0];
for (i = 0; i < *res_length; i++)
{
// select a random position to swap result[i]
j = i + rand() / (RAND_MAX / (*res_length - i) + 1);
// swap the two characters
swp = result[j];
result[j] = result[i];
result[i] = swp;
}
return result;
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_translate();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_translate() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_translate() and str_translate_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_translate(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_translate_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_translate";
unsigned long res_length;
/* make sure user has provided exactly three string arguments */
if (args->arg_count != 3) {
snprintf(message, MYSQL_ERRMSG_SIZE, "wrong argument count: str_translate requires three string arguments (subject, srcchar, dstchar), got %d argument%s.", args->arg_count, (args->arg_count == 1 ? "" : "s"));
return 1;
} else if (args->arg_type[0] != STRING_RESULT
|| args->arg_type[1] != STRING_RESULT
|| args->arg_type[2] != STRING_RESULT)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "wrong argument type: str_translate requires three string arguments (subject, srcchar, dstchar).");
return 1;
} else if (args->lengths[1] != args->lengths[2]) {
x_strlcpy(message, "str_translate(subject, srcchar, dstchar) requires srcchar and dstchar to have the same length", MYSQL_ERRMSG_SIZE);
return 1;
}
res_length = args->lengths[0];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{
char *tmp = (char *) malloc((size_t) res_length); /* This is a safe cast because res_length <= SIZE_MAX. */
if (tmp == NULL)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "malloc() failed to allocate %zu bytes of memory", (size_t) res_length);
return 1;
}
initid->ptr = tmp;
}
initid->maybe_null = 1;
initid->max_length = res_length;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_translate_init(); this func
** is called once for each query which invokes str_translate(),
** it is called after all of the calls to str_translate() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_translate_init() and str_translate())
** returns: nothing
******************************************************************************/
void str_translate_deinit(UDF_INIT *initid)
{
if (initid->ptr != NULL)
free(initid->ptr);
}
/******************************************************************************
** purpose: scan each char in subject, and replace every occurrence of
** a char that is contained in srcchar with the corresponding char
** in dstchar
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the string transformed by str_translate
******************************************************************************/
char *str_translate(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
int i, j;
const char *subject;
const char *src;
unsigned long src_length;
const char *dst;
if (args->args[0] == NULL || args->args[1] == NULL || args->args[2] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
// subject will contain the string to be translated
subject = args->args[0];
// src will contain the string to be translated
src = args->args[1];
src_length = args->lengths[1];
// dst will contain the string to be translated
dst = args->args[2];
if (initid->ptr != NULL)
{
result = initid->ptr;
}
*res_length = args->lengths[0];
memcpy(result, subject, *res_length);
{
char *__restrict p = result;
for (i = 0; i < *res_length; ++i, ++p)
{
// for each character of the subject string we check if it is present in src
for (j = 0; j < src_length; j++)
{
if (subject[i] == src[j])
{
// replace the character with the corresponding one from dst
*p = dst[j];
}
}
}
}
return result;
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_ucfirst();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_ucfirst() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_ucfirst() and str_ucfirst_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_ucfirst(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_ucfirst_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_ucfirst";
unsigned long res_length;
/* make sure user has provided exactly one string argument */
ARGCOUNTCHECK("string");
STRARGCHECK;
res_length = args->lengths[0];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{
char *tmp = (char *) malloc((size_t) res_length); /* This is a safe cast because res_length <= SIZE_MAX. */
if (tmp == NULL)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "malloc() failed to allocate %zu bytes of memory", (size_t) res_length);
return 1;
}
initid->ptr = tmp;
}
initid->maybe_null = 1;
initid->max_length = res_length;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_ucfirst_init(); this func
** is called once for each query which invokes str_ucfirst(),
** it is called after all of the calls to str_ucfirst() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_ucfirst_init() and str_ucfirst())
** returns: nothing
******************************************************************************/
void str_ucfirst_deinit(UDF_INIT *initid ATTRIBUTE_UNUSED)
{
if (initid->ptr != NULL)
free(initid->ptr);
}
/******************************************************************************
** purpose: make a string's first character uppercase
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the original string with the first character capitalized
******************************************************************************/
char *str_ucfirst(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
if (args->args[0] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
if (initid->ptr != NULL) {
result = initid->ptr;
}
// copy the argument string into result
memcpy(result, args->args[0], args->lengths[0]);
// capitalize the first character of the string
*result = my_toupper(&my_charset_latin1, *result);
*res_length = args->lengths[0];
*null_value = 0;
*error = 0;
return result;
}
/******************************************************************************
** purpose: called once for each SQL statement which invokes str_ucwords();
** checks arguments, sets restrictions, allocates memory that
** will be used during the main str_ucwords() function
** receives: pointer to UDF_INIT struct which is to be shared with all
** other functions (str_ucwords() and str_ucwords_deinit()) -
** the components of this struct are described in the MySQL manual;
** pointer to UDF_ARGS struct which contains information about
** the number, size, and type of args the query will be providing
** to each invocation of str_ucwords(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message
** can be stored if necessary
** returns: 1 => failure; 0 => successful initialization
******************************************************************************/
my_bool str_ucwords_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_ucwords";
unsigned long res_length;
/* make sure user has provided exactly one string argument */
ARGCOUNTCHECK("string");
STRARGCHECK;
res_length = args->lengths[0];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{
char *tmp = (char *) malloc((size_t) res_length); /* This is a safe cast because res_length <= SIZE_MAX. */
if (tmp == NULL)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "malloc() failed to allocate %zu bytes of memory", (size_t) res_length);
return 1;
}
initid->ptr = tmp;
}
initid->maybe_null = 1;
initid->max_length = res_length;
return 0;
}
/******************************************************************************
** purpose: deallocate memory allocated by str_ucwords_init(); this func
** is called once for each query which invokes str_ucwords(),
** it is called after all of the calls to str_ucwords() are done
** receives: pointer to UDF_INIT struct (the same which was used by
** str_ucwords_init() and str_ucwords())
** returns: nothing
******************************************************************************/
void str_ucwords_deinit(UDF_INIT *initid)
{
if (initid->ptr != NULL)
free(initid->ptr);
}
/******************************************************************************
** purpose: transform to uppercase the first character of each word in a string.
** Any string of characters that is immediately after a whitespace
** is considered a word
** receives: pointer to UDF_INIT struct which contains pre-allocated memory
** in which work can be done; pointer to UDF_ARGS struct which
** contains the functions arguments and data about them; pointer
** to mem which can be set to 1 if the result is NULL; pointer
** to mem which can be set to 1 if the calculation resulted in an
** error
** returns: the original string with the first character of each word capitalized
******************************************************************************/
char *str_ucwords(UDF_INIT *initid, UDF_ARGS *args,
char *result, unsigned long *res_length,
char *null_value, char *error)
{
int i;
int new_word = 0;
if (args->args[0] == NULL) {
result = NULL;
*res_length = 0;
*null_value = 1;
return result;
}
if (initid->ptr != NULL) {
result = initid->ptr;
}
// copy the argument string into result
memcpy(result, args->args[0], args->lengths[0]);
*res_length = args->lengths[0];
// capitalize the first character of each word in the string
for (i = 0; i < *res_length; i++)
{
if (my_isalpha(&my_charset_latin1, result[i]))
{
if (!new_word)
{
new_word = 1;
result[i] = my_toupper(&my_charset_latin1, result[i]);
}
}
else
{
new_word = 0;
}
}
return result;
}
/******************************************************************************
** purpose: called once for each invocation of str_xor();
** checks arguments, sets restrictions
** receives: pointer to UDF_INIT struct; pointer to UDF_ARGS struct which contains information about
** the number, length, and type of args that were passed to str_xor(); pointer to a char
** array of size MYSQL_ERRMSG_SIZE in which an error message can be stored if necessary
** returns: 1 => failure; 0 => success
******************************************************************************/
my_bool str_xor_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
static const char funcname[] = "str_xor";
unsigned long res_length;
if (args->arg_count != 2)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "wrong argument count: str_xor requires exactly two string arguments, got %d arguments.", args->arg_count);
return 1;
}
if (args->arg_type[0] != STRING_RESULT
|| args->arg_type[1] != STRING_RESULT)
{
x_strlcpy(message, "wrong argument type: str_xor requires two string arguments", MYSQL_ERRMSG_SIZE);
return 1;
}
res_length = args->lengths[0];
if (args->lengths[1] > res_length)
res_length = args->lengths[1];
if (SIZE_MAX < res_length)
{
snprintf(message, MYSQL_ERRMSG_SIZE, "res_length (%lu) cannot be greater than SIZE_MAX (%zu)", res_length, (size_t) (SIZE_MAX));
return 1;
}
initid->ptr = NULL;
if (res_length > 255)
{