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Add the new sqlite3_create_filename() and sqlite3_free_filename() interfaces

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for use by Shims.  Use these interfaces inside the multiplexor.

FossilOrigin-Name: 9469f36ac89e4b75d0ab25fefbeff25201992c53141da915dcaa017083cab6db
This commit is contained in:
drh
2020-02-18 19:49:48 +00:00
parent 0184a256e3
commit 4defdddc31
8 changed files with 147 additions and 14 deletions
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62
src/main.c
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@@ -4242,6 +4242,68 @@ static const char *databaseName(const char *zName){
return zName;
}
/*
** Append text z[] to the end of p[]. Return a pointer to the first
** character after then zero terminator on the new text in p[].
*/
static char *appendText(char *p, const char *z){
size_t n = strlen(z);
memcpy(p, z, n+1);
return p+n+1;
}
/*
** Allocate memory to hold names for a database, journal file, WAL file,
** and query parameters. The pointer returned is valid for use by
** sqlite3_filename_database() and sqlite3_uri_parameter() and related
** functions.
**
** Memory layout must be compatible with that generated by the pager
** and expected by sqlite3_uri_parameter() and databaseName().
*/
char *sqlite3_create_filename(
const char *zDatabase,
const char *zJournal,
const char *zWal,
int nParam,
const char **azParam
){
sqlite3_int64 nByte;
int i;
char *pResult, *p;
nByte = strlen(zDatabase) + strlen(zJournal) + strlen(zWal) + 10;
for(i=0; i<nParam*2; i++){
nByte += strlen(azParam[i])+1;
}
pResult = p = sqlite3_malloc64( nByte );
if( p==0 ) return 0;
memset(p, 0, 4);
p += 4;
p = appendText(p, zDatabase);
for(i=0; i<nParam*2; i++){
p = appendText(p, azParam[i]);
}
*(p++) = 0;
p = appendText(p, zJournal);
p = appendText(p, zWal);
*(p++) = 0;
*(p++) = 0;
assert( (sqlite3_int64)(p - pResult)==nByte );
return pResult + 4;
}
/*
** Free memory obtained from sqlite3_create_filename(). It is a severe
** error to call this routine with any parameter other than a pointer
** previously obtained from sqlite3_create_filename() or a NULL pointer.
*/
void sqlite3_free_filename(char *p){
if( p==0 ) return;
p = (char*)databaseName(p);
sqlite3_free(p - 4);
}
/*
** This is a utility routine, useful to VFS implementations, that checks
** to see if a database file was a URI that contained a specific query