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Ensure the type of an sqlite3_value* is not modified by calls to

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sqlite3_value_*() calls. (CVS 1463)

FossilOrigin-Name: ce8b15203413f38a8b7127eb08ae5db1c1eb164a
This commit is contained in:
danielk1977
2004-05-26 13:27:00 +00:00
parent 3cf8606395
commit b77f5dadbf
6 changed files with 137 additions and 129 deletions
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63
src/vdbeInt.h
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@@ -144,7 +144,7 @@ typedef struct Mem Mem;
** MemSetNull - Set the value to NULL.
** MemSetInt - Set the value to an integer.
** MemSetReal - Set the value to a real.
** MemSetStr - Set the value to a string.
** MemSetStr - Set the value to a string (or blob if enc==0).
*/
#define MemSetNull(p) sqlite3VdbeMemSetNull(p)
#define MemSetInt(p,v) sqlite3VdbeMemSetInt(p,v)
@@ -159,22 +159,21 @@ typedef struct Mem Mem;
**
** Non-zero is returned if a malloc() fails.
*/
#define MemNulTerminate(p) ( \
((p)->flags&MEM_Str) && \
!((p)->flags&MEM_Term) && \
sqlite3VdbeMemNulTerminate(p) )
#define MemNulTerminate(p) \
if( ((p)->flags&MEM_Str) && !((p)->flags&MEM_Term) ) sqlite3VdbeMemNulTerminate(p);
/*
** Allowed values for Mem.flags.
/* One or more of the following flags are set to indicate the valid
** representations of the value stored in the Mem struct.
**
** The first 5 values determine the data type(s). Null and Blob must
** occur alone. But Str, Int, and Real can occur together.
** If the MEM_Null flag is set, then the value is an SQL NULL value.
** No other flags may be set in this case.
**
** The next 3 utf entries determine the text representation for strings.
** These values are only meaningful if the type is Str.
**
** The last 4 values specify what kind of memory Mem.z points to.
** These valus are only meaningful if the Str or Blob types are used.
** If the MEM_Str flag is set then Mem.z points at a string representation.
** Usually this is encoded in the same unicode encoding as the main
** database (see below for exceptions). If the MEM_Term flag is also
** set, then the string is nul terminated. The MEM_Int and MEM_Real
** flags may coexist with the MEM_Str flag.
**
*/
#define MEM_Null 0x0001 /* Value is NULL */
#define MEM_Str 0x0002 /* Value is a string */
@@ -182,12 +181,30 @@ typedef struct Mem Mem;
#define MEM_Real 0x0008 /* Value is a real number */
#define MEM_Blob 0x0010 /* Value is a BLOB */
#define MEM_Term 0x0200 /* String has a nul terminator character */
#define MEM_Term 0x0100 /* String rep is nul terminated */
#define MEM_Dyn 0x0400 /* Need to call sqliteFree() on Mem.z */
#define MEM_Static 0x0800 /* Mem.z points to a static string */
#define MEM_Ephem 0x1000 /* Mem.z points to an ephemeral string */
#define MEM_Short 0x2000 /* Mem.z points to Mem.zShort */
/* Values with type NULL or BLOB can have only one representation. But
** values with a manifest type of REAL, INTEGER or STRING may have one
** or more representation cached in the Mem struct at any one time. The
** flags MEM_IntVal, MEM_RealVal and MEM_StrVal are true whenever the real,
** integer or string representation stored in a Mem struct is valid.
**
** When MEM_StrVal is set, then MEM_Term may also be set. This indicates
** that the string is terminated with a nul-terminator character.
*/
#define MEM_TypeInt 0x0020 /* Value type is an integer */
#define MEM_TypeReal 0x0040 /* Value type is real */
#define MEM_TypeStr 0x0080 /* Value type is string */
/* Whenever Mem contains a valid string or blob representation, one of
** the following flags must be set to determine the memory management
** policy for Mem.z
*/
#define MEM_Dyn 0x0200 /* Need to call sqliteFree() on Mem.z */
#define MEM_Static 0x0400 /* Mem.z points to a static string */
#define MEM_Ephem 0x0800 /* Mem.z points to an ephemeral string */
#define MEM_Short 0x1000 /* Mem.z points to Mem.zShort */
/* Internally, all strings manipulated by the VDBE are encoded using the
** native encoding for the main database. Therefore the following three
@@ -214,15 +231,15 @@ typedef struct Mem Mem;
** sqlite3_column_data() or sqlite3_column_data16(). If this occurs, then
** the MEM_Utf* flags are updated accordingly.
*/
#define MEM_Utf8 0x0040 /* String uses UTF-8 encoding */
#define MEM_Utf16be 0x0080 /* String uses UTF-16 big-endian */
#define MEM_Utf16le 0x0100 /* String uses UTF-16 little-endian */
#define MEM_Utf8 0x2000 /* String uses UTF-8 encoding */
#define MEM_Utf16be 0x4000 /* String uses UTF-16 big-endian */
#define MEM_Utf16le 0x8000 /* String uses UTF-16 little-endian */
/* The following MEM_ value appears only in AggElem.aMem.s.flag fields.
** It indicates that the corresponding AggElem.aMem.z points to a
** aggregate function context that needs to be finalized.
*/
#define MEM_AggCtx 0x4000 /* Mem.z points to an agg function context */
#define MEM_AggCtx 0x10000 /* Mem.z points to an agg function context */
/*
** The "context" argument for a installable function. A pointer to an