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Edit File : m_string.h \| Size : 10.07 KB
/* Copyright (c) 2000, 2012, Oracle and/or its affiliates. Copyright (c) 2019, 2021, MariaDB Corporation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. 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 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 02110-1335 USA / / There may be problems included in all of these. Try to test in configure which ones are needed? / / This is needed for the definitions of strchr... on solaris / #ifndef _m_string_h #define _m_string_h #include "my_decimal_limits.h" #ifndef __USE_GNU #define __USE_GNU / We want to use stpcpy / #endif #if defined(HAVE_STRINGS_H) #include <strings.h> #endif #if defined(HAVE_STRING_H) #include <string.h> #endif / This is needed for the definitions of memcpy... on solaris / #if defined(HAVE_MEMORY_H) && !defined(__cplusplus) #include <memory.h> #endif #if !defined(HAVE_MEMCPY) && !defined(HAVE_MEMMOVE) # define memcpy(d, s, n) bcopy ((s), (d), (n)) # define memset(A,C,B) bfill((A),(B),(C)) # define memmove(d, s, n) bmove ((d), (s), (n)) #elif defined(HAVE_MEMMOVE) # define bmove(d, s, n) memmove((d), (s), (n)) #endif / Unixware 7 / #if !defined(HAVE_BFILL) # define bfill(A,B,C) memset((A),(C),(B)) #endif # define bmove_align(A,B,C) memcpy((A),(B),(C)) # define bcmp(A,B,C) memcmp((A),(B),(C)) #if !defined(bzero) # define bzero(A,B) memset((A),0,(B)) #endif #if defined(__cplusplus) extern "C" { #endif #ifdef DBUG_OFF #if defined(HAVE_STPCPY) && defined(__GNUC__) && !defined(__INTEL_COMPILER) #define strmov(A,B) __builtin_stpcpy((A),(B)) #elif defined(HAVE_STPCPY) #define strmov(A,B) stpcpy((A),(B)) #endif #endif / Declared in int2str() / extern const char _dig_vec_upper[]; extern const char _dig_vec_lower[]; extern char strmov_overlapp(char dest, const char src); #if defined(_lint) \|\| defined(FORCE_INIT_OF_VARS) #define LINT_INIT_STRUCT(var) bzero(&var, sizeof(var)) /* No uninitialize-warning / #else #define LINT_INIT_STRUCT(var) #endif / Prototypes for string functions / extern void bmove_upp(uchar dst,const uchar src,size_t len); extern void bchange(uchar dst,size_t old_len,const uchar src, size_t new_len,size_t tot_len); extern void strappend(char s,size_t len,pchar fill); extern char strend(const char s); extern char strcend(const char , pchar); extern char strfill(char s,size_t len,pchar fill); extern char strmake(char dst,const char src,size_t length); #if !defined(__GNUC__) \|\| (__GNUC__ < 4) #define strmake_buf(D,S) strmake(D, S, sizeof(D) - 1) #else #define strmake_buf(D,S) ({ \ __typeof__ (D) __x __attribute__((unused)) = { 2 }; \ strmake(D, S, sizeof(D) - 1); \ }) #endif #ifndef strmov extern char strmov(char dst,const char src); #endif extern char strnmov(char dst, const char src, size_t n); extern char strcont(const char src, const char set); extern char strxmov(char dst, const char src, ...); extern char strxnmov(char dst, size_t len, const char src, ...); /* Prototypes of normal stringfunctions (with may ours) / #ifndef HAVE_STRNLEN extern size_t strnlen(const char s, size_t n); #endif extern int is_prefix(const char , const char ); /* Conversion routines / typedef enum { MY_GCVT_ARG_FLOAT, MY_GCVT_ARG_DOUBLE } my_gcvt_arg_type; double my_strtod(const char str, char *end, int error); double my_atof(const char nptr); size_t my_fcvt(double x, int precision, char to, my_bool error); size_t my_gcvt(double x, my_gcvt_arg_type type, int width, char to, my_bool error); / The longest string my_fcvt can return is 311 + "precision" bytes. Here we assume that we never cal my_fcvt() with precision >= DECIMAL_NOT_SPECIFIED (+ 1 byte for the terminating '\0'). / #define FLOATING_POINT_BUFFER (311 + DECIMAL_NOT_SPECIFIED) / We want to use the 'e' format in some cases even if we have enough space for the 'f' one just to mimic sprintf("%.15g") behavior for large integers, and to improve it for numbers < 10^(-4). That is, for \|x\| < 1 we require \|x\| >= 10^(-15), and for \|x\| > 1 we require it to be integer and be <= 10^DBL_DIG for the 'f' format to be used. We don't lose precision, but make cases like "1e200" or "0.00001" look nicer. / #define MAX_DECPT_FOR_F_FORMAT DBL_DIG / The maximum possible field width for my_gcvt() conversion. (DBL_DIG + 2) significant digits + sign + "." + ("e-NNN" or MAX_DECPT_FOR_F_FORMAT zeros for cases when \|x\|<1 and the 'f' format is used). / #define MY_GCVT_MAX_FIELD_WIDTH (DBL_DIG + 4 + MY_MAX(5, MAX_DECPT_FOR_F_FORMAT)) \ extern char llstr(longlong value,char buff); extern char ullstr(longlong value,char buff); #ifndef HAVE_STRTOUL extern long strtol(const char str, char *ptr, int base); extern ulong strtoul(const char str, char *ptr, int base); #endif extern char int2str(long val, char dst, int radix, int upcase); extern char int10_to_str(long val,char dst,int radix); extern char str2int(const char src,int radix,long lower,long upper, long val); longlong my_strtoll10(const char nptr, char endptr, int error); #if SIZEOF_LONG == SIZEOF_LONG_LONG #define ll2str(A,B,C,D) int2str((A),(B),(C),(D)) #define longlong10_to_str(A,B,C) int10_to_str((A),(B),(C)) #undef strtoll #define strtoll(A,B,C) strtol((A),(B),(C)) #define strtoull(A,B,C) strtoul((A),(B),(C)) #ifndef HAVE_STRTOULL #define HAVE_STRTOULL #endif #ifndef HAVE_STRTOLL #define HAVE_STRTOLL #endif #else #ifdef HAVE_LONG_LONG extern char ll2str(longlong val,char dst,int radix, int upcase); extern char longlong10_to_str(longlong val,char dst,int radix); #if (!defined(HAVE_STRTOULL) \|\| defined(NO_STRTOLL_PROTO)) extern longlong strtoll(const char str, char ptr, int base); extern ulonglong strtoull(const char str, char *ptr, int base); #endif #endif #endif #define longlong2str(A,B,C) ll2str((A),(B),(C),1) #if defined(__cplusplus) } #endif #include <mysql/plugin.h> #ifdef __cplusplus #include <type_traits> template<typename T> inline const char _swl_check(T s) { static_assert(std::is_same<T, const char (&)[sizeof(T)]>::value \|\| std::is_same<T, const char [sizeof(T)]>::value, "Wrong argument for STRING_WITH_LEN()"); return s; } #define STRING_WITH_LEN(X) _swl_check<decltype(X)>(X), ((size_t) (sizeof(X) - 1)) #else #define STRING_WITH_LEN(X) (X ""), ((size_t) (sizeof(X) - 1)) #endif #define USTRING_WITH_LEN(X) (uchar) STRING_WITH_LEN(X) #define C_STRING_WITH_LEN(X) (char ) STRING_WITH_LEN(X) #define LEX_STRING_WITH_LEN(X) (X).str, (X).length typedef struct st_mysql_const_lex_string LEX_CSTRING; /* A variant with const and unsigned / struct st_mysql_const_unsigned_lex_string { const uchar str; size_t length; }; typedef struct st_mysql_const_unsigned_lex_string LEX_CUSTRING; static inline void lex_string_set(LEX_CSTRING lex_str, const char c_str) { lex_str->str= c_str; lex_str->length= strlen(c_str); } static inline void lex_string_set3(LEX_CSTRING lex_str, const char c_str, size_t len) { lex_str->str= c_str; lex_str->length= len; } /** Copies a string. @param dst destination buffer, will be NUL padded. @param dst_size size of dst buffer, must be > 0 @param src NUL terminated source string / static inline void safe_strcpy(char dst, size_t dst_size, const char src) { DBUG_ASSERT(dst_size > 0); / 1) IF there is a 0 byte in the first dst_size bytes of src, strncpy will * 0-terminate dst, and pad dst with additional 0 bytes out to dst_size. * * 2) IF there is no 0 byte in the first dst_size bytes of src, strncpy will * copy dst_size bytes, and the final byte won't be 0. * * In GCC 8+, the `-Wstringop-truncation` warning may object to strncpy() * being used in this way, so we need to disable this warning for this * single statement. / #if defined __GNUC__ && __GNUC__ >= 8 #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wstringop-truncation" #endif strncpy(dst, src, dst_size); #if defined __GNUC__ && __GNUC__ >= 8 #pragma GCC diagnostic pop #endif dst[dst_size - 1]= 0; } /* Copies a string, checking for truncation. @param dst destination buffer, will be NUL padded. @param dst_size size of dst buffer, must be > 0 @param src NUL terminated source string @retval 1 if the src string was truncated due to too small size of dst. @retval 0 if src completely fit within dst, / static inline int safe_strcpy_truncated(char dst, size_t dst_size, const char src) { DBUG_ASSERT(dst_size > 0); if (dst_size == 0) return 1; / We do not want to use strncpy() as we do not want to rely on strncpy() filling the unused dst with 0. We cannot use strmake() here as it in debug mode fills the buffers with 'Z'. / if (strnmov(dst, src, dst_size) == dst+dst_size) { dst[dst_size-1]= 0; return 1; } return 0; } /* Appends src to dst and ensures dst is a NUL terminated C string. @retval 1 if the src string was truncated due to too small size of dst. @retval 0 if src completely fit within the remaining dst space, including NUL termination. / static inline int safe_strcat(char dst, size_t dst_size, const char src) { size_t init_len= strlen(dst); if (init_len >= dst_size) return 1; return safe_strcpy_truncated(dst + init_len, dst_size - init_len, src); } #ifdef __cplusplus static inline char safe_str(char str) { return str ? str : const_cast<char>(""); } #endif static inline const char safe_str(const char str) { return str ? str : ""; } static inline size_t safe_strlen(const char *str) { return str ? strlen(str) : 0; } #endif Back

Edit File : m_string.h | Size : 10.07 KB

/*
   Copyright (c) 2000, 2012, Oracle and/or its affiliates.
   Copyright (c) 2019, 2021, MariaDB Corporation.

This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

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 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 02110-1335  USA */

/* There may be problems included in all of these. Try to test in
   configure which ones are needed? */

/*  This is needed for the definitions of strchr... on solaris */

#ifndef _m_string_h
#define _m_string_h

#include "my_decimal_limits.h"

#ifndef __USE_GNU
#define __USE_GNU				/* We want to use stpcpy */
#endif
#if defined(HAVE_STRINGS_H)
#include <strings.h>
#endif
#if defined(HAVE_STRING_H)
#include <string.h>
#endif

/*  This is needed for the definitions of memcpy... on solaris */
#if defined(HAVE_MEMORY_H) && !defined(__cplusplus)
#include <memory.h>
#endif

#if !defined(HAVE_MEMCPY) && !defined(HAVE_MEMMOVE)
# define memcpy(d, s, n)	bcopy ((s), (d), (n))
# define memset(A,C,B)		bfill((A),(B),(C))
# define memmove(d, s, n)	bmove ((d), (s), (n))
#elif defined(HAVE_MEMMOVE)
# define bmove(d, s, n)		memmove((d), (s), (n))
#endif

/* Unixware 7 */
#if !defined(HAVE_BFILL)
# define bfill(A,B,C)           memset((A),(C),(B))
#endif

# define bmove_align(A,B,C)     memcpy((A),(B),(C))

# define bcmp(A,B,C)		memcmp((A),(B),(C))

#if !defined(bzero)
# define bzero(A,B)             memset((A),0,(B))
#endif

#if defined(__cplusplus)
extern "C" {
#endif

#ifdef DBUG_OFF
#if defined(HAVE_STPCPY) && defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define strmov(A,B) __builtin_stpcpy((A),(B))
#elif defined(HAVE_STPCPY)
#define strmov(A,B) stpcpy((A),(B))
#endif
#endif

/* Declared in int2str() */
extern const char _dig_vec_upper[];
extern const char _dig_vec_lower[];

extern char *strmov_overlapp(char *dest, const char *src);

#if defined(_lint) || defined(FORCE_INIT_OF_VARS)
#define LINT_INIT_STRUCT(var) bzero(&var, sizeof(var)) /* No uninitialize-warning */
#else
#define LINT_INIT_STRUCT(var)
#endif

/* Prototypes for string functions */

extern	void bmove_upp(uchar *dst,const uchar *src,size_t len);
extern	void bchange(uchar *dst,size_t old_len,const uchar *src,
		     size_t new_len,size_t tot_len);
extern	void strappend(char *s,size_t len,pchar fill);
extern	char *strend(const char *s);
extern  char *strcend(const char *, pchar);
extern	char *strfill(char * s,size_t len,pchar fill);
extern	char *strmake(char *dst,const char *src,size_t length);

#if !defined(__GNUC__) || (__GNUC__ < 4)
#define strmake_buf(D,S)        strmake(D, S, sizeof(D) - 1)
#else
#define strmake_buf(D,S) ({                             \
  __typeof__ (D) __x __attribute__((unused)) = { 2 };   \
  strmake(D, S, sizeof(D) - 1);                         \
  })
#endif

#ifndef strmov
extern	char *strmov(char *dst,const char *src);
#endif
extern	char *strnmov(char *dst, const char *src, size_t n);
extern	char *strcont(const char *src, const char *set);
extern	char *strxmov(char *dst, const char *src, ...);
extern	char *strxnmov(char *dst, size_t len, const char *src, ...);

/* Prototypes of normal stringfunctions (with may ours) */
#ifndef HAVE_STRNLEN
extern size_t strnlen(const char *s, size_t n);
#endif

extern int is_prefix(const char *, const char *);

/* Conversion routines */
typedef enum {
  MY_GCVT_ARG_FLOAT,
  MY_GCVT_ARG_DOUBLE
} my_gcvt_arg_type;

double my_strtod(const char *str, char **end, int *error);
double my_atof(const char *nptr);
size_t my_fcvt(double x, int precision, char *to, my_bool *error);
size_t my_gcvt(double x, my_gcvt_arg_type type, int width, char *to,
               my_bool *error);

/*
  The longest string my_fcvt can return is 311 + "precision" bytes.
  Here we assume that we never cal my_fcvt() with
  precision >= DECIMAL_NOT_SPECIFIED
  (+ 1 byte for the terminating '\0').
*/
#define FLOATING_POINT_BUFFER (311 + DECIMAL_NOT_SPECIFIED)

/*
  We want to use the 'e' format in some cases even if we have enough space
  for the 'f' one just to mimic sprintf("%.15g") behavior for large integers,
  and to improve it for numbers < 10^(-4).
  That is, for |x| < 1 we require |x| >= 10^(-15), and for |x| > 1 we require
  it to be integer and be <= 10^DBL_DIG for the 'f' format to be used.
  We don't lose precision, but make cases like "1e200" or "0.00001" look nicer.
*/
#define MAX_DECPT_FOR_F_FORMAT DBL_DIG

/*
  The maximum possible field width for my_gcvt() conversion.
  (DBL_DIG + 2) significant digits + sign + "." + ("e-NNN" or
  MAX_DECPT_FOR_F_FORMAT zeros for cases when |x|<1 and the 'f' format is used).
*/
#define MY_GCVT_MAX_FIELD_WIDTH (DBL_DIG + 4 + MY_MAX(5, MAX_DECPT_FOR_F_FORMAT)) \

extern char *llstr(longlong value,char *buff);
extern char *ullstr(longlong value,char *buff);
#ifndef HAVE_STRTOUL
extern long strtol(const char *str, char **ptr, int base);
extern ulong strtoul(const char *str, char **ptr, int base);
#endif

extern char *int2str(long val, char *dst, int radix, int upcase);
extern char *int10_to_str(long val,char *dst,int radix);
extern char *str2int(const char *src,int radix,long lower,long upper,
			 long *val);
longlong my_strtoll10(const char *nptr, char **endptr, int *error);
#if SIZEOF_LONG == SIZEOF_LONG_LONG
#define ll2str(A,B,C,D) int2str((A),(B),(C),(D))
#define longlong10_to_str(A,B,C) int10_to_str((A),(B),(C))
#undef strtoll
#define strtoll(A,B,C) strtol((A),(B),(C))
#define strtoull(A,B,C) strtoul((A),(B),(C))
#ifndef HAVE_STRTOULL
#define HAVE_STRTOULL
#endif
#ifndef HAVE_STRTOLL
#define HAVE_STRTOLL
#endif
#else
#ifdef HAVE_LONG_LONG
extern char *ll2str(longlong val,char *dst,int radix, int upcase);
extern char *longlong10_to_str(longlong val,char *dst,int radix);
#if (!defined(HAVE_STRTOULL) || defined(NO_STRTOLL_PROTO))
extern longlong strtoll(const char *str, char **ptr, int base);
extern ulonglong strtoull(const char *str, char **ptr, int base);
#endif
#endif
#endif
#define longlong2str(A,B,C) ll2str((A),(B),(C),1)

#if defined(__cplusplus)
}
#endif

#include <mysql/plugin.h>

#ifdef __cplusplus
#include <type_traits>
template<typename T> inline const char *_swl_check(T s)
{
  static_assert(std::is_same<T, const char (&)[sizeof(T)]>::value
             || std::is_same<T, const char [sizeof(T)]>::value,
             "Wrong argument for STRING_WITH_LEN()");
  return s;
}
#define STRING_WITH_LEN(X) _swl_check<decltype(X)>(X), ((size_t) (sizeof(X) - 1))
#else
#define STRING_WITH_LEN(X) (X ""), ((size_t) (sizeof(X) - 1))
#endif

#define USTRING_WITH_LEN(X) (uchar*) STRING_WITH_LEN(X)
#define C_STRING_WITH_LEN(X) (char *) STRING_WITH_LEN(X)
#define LEX_STRING_WITH_LEN(X) (X).str, (X).length

typedef struct st_mysql_const_lex_string LEX_CSTRING;

/* A variant with const and unsigned */
struct st_mysql_const_unsigned_lex_string
{
  const uchar *str;
  size_t length;
};
typedef struct st_mysql_const_unsigned_lex_string LEX_CUSTRING;

static inline void lex_string_set(LEX_CSTRING *lex_str, const char *c_str)
{
  lex_str->str= c_str;
  lex_str->length= strlen(c_str);
}
static inline void lex_string_set3(LEX_CSTRING *lex_str, const char *c_str,
                                   size_t len)
{
  lex_str->str= c_str;
  lex_str->length= len;
}

/**
  Copies a string.

@param dst        destination buffer, will be NUL padded.
  @param dst_size   size of dst buffer, must be > 0
  @param src        NUL terminated source string
*/
static inline void safe_strcpy(char *dst, size_t dst_size, const char *src)
{
  DBUG_ASSERT(dst_size > 0);

/* 1) IF there is a 0 byte in the first dst_size bytes of src, strncpy will
   *    0-terminate dst, and pad dst with additional 0 bytes out to dst_size.
   *
   * 2) IF there is no 0 byte in the first dst_size bytes of src, strncpy will
   *    copy dst_size bytes, and the final byte won't be 0.
   *
   * In GCC 8+, the `-Wstringop-truncation` warning may object to strncpy()
   * being used in this way, so we need to disable this warning for this
   * single statement.
   */

#if defined __GNUC__ && __GNUC__ >= 8
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstringop-truncation"
#endif
  strncpy(dst, src, dst_size);
#if defined __GNUC__ && __GNUC__ >= 8
#pragma GCC diagnostic pop
#endif
  dst[dst_size - 1]= 0;
}

/**
  Copies a string, checking for truncation.

@param dst        destination buffer, will be NUL padded.
  @param dst_size   size of dst buffer, must be > 0
  @param src        NUL terminated source string

@retval 1 if the src string was truncated due to too small size of dst.
  @retval 0 if src completely fit within dst,
*/
static inline int safe_strcpy_truncated(char *dst, size_t dst_size,
                                        const char *src)
{

DBUG_ASSERT(dst_size > 0);
  if (dst_size == 0)
    return 1;
  /*
    We do not want to use strncpy() as we do not want to rely on
    strncpy() filling the unused dst with 0.
    We cannot use strmake() here as it in debug mode fills the buffers
    with 'Z'.
  */
  if (strnmov(dst, src, dst_size) == dst+dst_size)
  {
    dst[dst_size-1]= 0;
    return 1;
  }
  return 0;
}

/**
  Appends src to dst and ensures dst is a NUL terminated C string.

@retval 1 if the src string was truncated due to too small size of dst.
  @retval 0 if src completely fit within the remaining dst space,
  including NUL termination.
*/
static inline int safe_strcat(char *dst, size_t dst_size, const char *src)
{
  size_t init_len= strlen(dst);
  if (init_len >= dst_size)
    return 1;
  return safe_strcpy_truncated(dst + init_len, dst_size - init_len, src);
}

#ifdef __cplusplus
static inline char *safe_str(char *str)
{ return str ? str : const_cast<char*>(""); }
#endif

static inline const char *safe_str(const char *str)
{ return str ? str : ""; }

static inline size_t safe_strlen(const char *str)
{ return str ? strlen(str) : 0; }

#endif

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