[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/ext/misc/nextchar.c

Index: third_party/sqlite/sqlite-src-3080704/ext/misc/nextchar.c
diff --git a/third_party/sqlite/sqlite-src-3080704/ext/misc/nextchar.c b/third_party/sqlite/sqlite-src-3080704/ext/misc/nextchar.c
deleted file mode 100644
index 49dfd24f1f1faa2859d1355a5090cf5e676675e9..0000000000000000000000000000000000000000
--- a/third_party/sqlite/sqlite-src-3080704/ext/misc/nextchar.c
+++ /dev/null
@@ -1,311 +0,0 @@
-/*
-** 2013-02-28
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** This file contains code to implement the next_char(A,T,F,W,C) SQL function.
-**
-** The next_char(A,T,F,W,C) function finds all valid "next" characters for
-** string A given the vocabulary in T.F.  If the W value exists and is a
-** non-empty string, then it is an SQL expression that limits the entries
-** in T.F that will be considered.  If C exists and is a non-empty string,
-** then it is the name of the collating sequence to use for comparison.  If
-** 
-** Only the first three arguments are required.  If the C parameter is 
-** omitted or is NULL or is an empty string, then the default collating 
-** sequence of T.F is used for comparision.  If the W parameter is omitted
-** or is NULL or is an empty string, then no filtering of the output is
-** done.
-**
-** The T.F column should be indexed using collation C or else this routine
-** will be quite slow.
-**
-** For example, suppose an application has a dictionary like this:
-**
-**   CREATE TABLE dictionary(word TEXT UNIQUE);
-**
-** Further suppose that for user keypad entry, it is desired to disable
-** (gray out) keys that are not valid as the next character.  If the
-** the user has previously entered (say) 'cha' then to find all allowed
-** next characters (and thereby determine when keys should not be grayed
-** out) run the following query:
-**
-**   SELECT next_char('cha','dictionary','word');
-**
-** IMPLEMENTATION NOTES:
-**
-** The next_char function is implemented using recursive SQL that makes
-** use of the table name and column name as part of a query.  If either
-** the table name or column name are keywords or contain special characters,
-** then they should be escaped.  For example:
-**
-**   SELECT next_char('cha','[dictionary]','[word]');
-**
-** This also means that the table name can be a subquery:
-**
-**   SELECT next_char('cha','(SELECT word AS w FROM dictionary)','w');
-*/
-#include "sqlite3ext.h"
-SQLITE_EXTENSION_INIT1
-#include <string.h>
-
-/*
-** A structure to hold context of the next_char() computation across
-** nested function calls.
-*/
-typedef struct nextCharContext nextCharContext;
-struct nextCharContext {
-  sqlite3 *db;                      /* Database connection */
-  sqlite3_stmt *pStmt;              /* Prepared statement used to query */
-  const unsigned char *zPrefix;     /* Prefix to scan */
-  int nPrefix;                      /* Size of zPrefix in bytes */
-  int nAlloc;                       /* Space allocated to aResult */
-  int nUsed;                        /* Space used in aResult */
-  unsigned int *aResult;            /* Array of next characters */
-  int mallocFailed;                 /* True if malloc fails */
-  int otherError;                   /* True for any other failure */
-};
-
-/*
-** Append a result character if the character is not already in the
-** result.
-*/
-static void nextCharAppend(nextCharContext *p, unsigned c){
-  int i;
-  for(i=0; i<p->nUsed; i++){
-    if( p->aResult[i]==c ) return;
-  }
-  if( p->nUsed+1 > p->nAlloc ){
-    unsigned int *aNew;
-    int n = p->nAlloc*2 + 30;
-    aNew = sqlite3_realloc(p->aResult, n*sizeof(unsigned int));
-    if( aNew==0 ){
-      p->mallocFailed = 1;
-      return;
-    }else{
-      p->aResult = aNew;
-      p->nAlloc = n;
-    }
-  }
-  p->aResult[p->nUsed++] = c;
-}
-
-/*
-** Write a character into z[] as UTF8.  Return the number of bytes needed
-** to hold the character
-*/
-static int writeUtf8(unsigned char *z, unsigned c){
-  if( c<0x00080 ){
-    z[0] = (unsigned char)(c&0xff);
-    return 1;
-  }
-  if( c<0x00800 ){
-    z[0] = 0xC0 + (unsigned char)((c>>6)&0x1F);
-    z[1] = 0x80 + (unsigned char)(c & 0x3F);
-    return 2;
-  }
-  if( c<0x10000 ){
-    z[0] = 0xE0 + (unsigned char)((c>>12)&0x0F);
-    z[1] = 0x80 + (unsigned char)((c>>6) & 0x3F);
-    z[2] = 0x80 + (unsigned char)(c & 0x3F);
-    return 3;
-  }
-  z[0] = 0xF0 + (unsigned char)((c>>18) & 0x07);
-  z[1] = 0x80 + (unsigned char)((c>>12) & 0x3F);
-  z[2] = 0x80 + (unsigned char)((c>>6) & 0x3F);
-  z[3] = 0x80 + (unsigned char)(c & 0x3F);
-  return 4;
-}
-
-/*
-** Read a UTF8 character out of z[] and write it into *pOut.  Return
-** the number of bytes in z[] that were used to construct the character.
-*/
-static int readUtf8(const unsigned char *z, unsigned *pOut){
-  static const unsigned char validBits[] = {
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-    0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
-  };
-  unsigned c = z[0];
-  if( c<0xc0 ){
-    *pOut = c;
-    return 1;
-  }else{
-    int n = 1;
-    c = validBits[c-0xc0];
-    while( (z[n] & 0xc0)==0x80 ){
-      c = (c<<6) + (0x3f & z[n++]);
-    }
-    if( c<0x80 || (c&0xFFFFF800)==0xD800 || (c&0xFFFFFFFE)==0xFFFE ){
-      c = 0xFFFD;
-    }
-    *pOut = c;
-    return n;
-  }
-}
-
-/*
-** The nextCharContext structure has been set up.  Add all "next" characters
-** to the result set.
-*/
-static void findNextChars(nextCharContext *p){
-  unsigned cPrev = 0;
-  unsigned char zPrev[8];
-  int n, rc;
-  
-  for(;;){
-    sqlite3_bind_text(p->pStmt, 1, (char*)p->zPrefix, p->nPrefix,
-                      SQLITE_STATIC);
-    n = writeUtf8(zPrev, cPrev+1);
-    sqlite3_bind_text(p->pStmt, 2, (char*)zPrev, n, SQLITE_STATIC);
-    rc = sqlite3_step(p->pStmt);
-    if( rc==SQLITE_DONE ){
-      sqlite3_reset(p->pStmt);
-      return;
-    }else if( rc!=SQLITE_ROW ){
-      p->otherError = rc;
-      return;
-    }else{
-      const unsigned char *zOut = sqlite3_column_text(p->pStmt, 0);
-      unsigned cNext;
-      n = readUtf8(zOut+p->nPrefix, &cNext);
-      sqlite3_reset(p->pStmt);
-      nextCharAppend(p, cNext);
-      cPrev = cNext;
-      if( p->mallocFailed ) return;
-    }
-  }
-}
-
-
-/*
-** next_character(A,T,F,W)
-**
-** Return a string composted of all next possible characters after
-** A for elements of T.F.  If W is supplied, then it is an SQL expression
-** that limits the elements in T.F that are considered.
-*/
-static void nextCharFunc(
-  sqlite3_context *context,
-  int argc,
-  sqlite3_value **argv
-){
-  nextCharContext c;
-  const unsigned char *zTable = sqlite3_value_text(argv[1]);
-  const unsigned char *zField = sqlite3_value_text(argv[2]);
-  const unsigned char *zWhere;
-  const unsigned char *zCollName;
-  char *zWhereClause = 0;
-  char *zColl = 0;
-  char *zSql;
-  int rc;
-
-  memset(&c, 0, sizeof(c));
-  c.db = sqlite3_context_db_handle(context);
-  c.zPrefix = sqlite3_value_text(argv[0]);
-  c.nPrefix = sqlite3_value_bytes(argv[0]);
-  if( zTable==0 || zField==0 || c.zPrefix==0 ) return;
-  if( argc>=4
-   && (zWhere = sqlite3_value_text(argv[3]))!=0
-   && zWhere[0]!=0
-  ){
-    zWhereClause = sqlite3_mprintf("AND (%s)", zWhere);
-    if( zWhereClause==0 ){
-      sqlite3_result_error_nomem(context);
-      return;
-    }
-  }else{
-    zWhereClause = "";
-  }
-  if( argc>=5
-   && (zCollName = sqlite3_value_text(argv[4]))!=0
-   && zCollName[0]!=0 
-  ){
-    zColl = sqlite3_mprintf("collate \"%w\"", zCollName);
-    if( zColl==0 ){
-      sqlite3_result_error_nomem(context);
-      if( zWhereClause[0] ) sqlite3_free(zWhereClause);
-      return;
-    }
-  }else{
-    zColl = "";
-  }
-  zSql = sqlite3_mprintf(
-    "SELECT %s FROM %s"
-    " WHERE %s>=(?1 || ?2) %s"
-    "   AND %s<=(?1 || char(1114111)) %s" /* 1114111 == 0x10ffff */
-    "   %s"
-    " ORDER BY 1 %s ASC LIMIT 1",
-    zField, zTable, zField, zColl, zField, zColl, zWhereClause, zColl
-  );
-  if( zWhereClause[0] ) sqlite3_free(zWhereClause);
-  if( zColl[0] ) sqlite3_free(zColl);
-  if( zSql==0 ){
-    sqlite3_result_error_nomem(context);
-    return;
-  }
-
-  rc = sqlite3_prepare_v2(c.db, zSql, -1, &c.pStmt, 0);
-  sqlite3_free(zSql);
-  if( rc ){
-    sqlite3_result_error(context, sqlite3_errmsg(c.db), -1);
-    return;
-  }
-  findNextChars(&c);
-  if( c.mallocFailed ){
-    sqlite3_result_error_nomem(context);
-  }else{
-    unsigned char *pRes;
-    pRes = sqlite3_malloc( c.nUsed*4 + 1 );
-    if( pRes==0 ){
-      sqlite3_result_error_nomem(context);
-    }else{
-      int i;
-      int n = 0;
-      for(i=0; i<c.nUsed; i++){
-        n += writeUtf8(pRes+n, c.aResult[i]);
-      }
-      pRes[n] = 0;
-      sqlite3_result_text(context, (const char*)pRes, n, sqlite3_free);
-    }
-  }
-  sqlite3_finalize(c.pStmt);
-  sqlite3_free(c.aResult);
-}
-
-#ifdef _WIN32
-__declspec(dllexport)
-#endif
-int sqlite3_nextchar_init(
-  sqlite3 *db, 
-  char **pzErrMsg, 
-  const sqlite3_api_routines *pApi
-){
-  int rc = SQLITE_OK;
-  SQLITE_EXTENSION_INIT2(pApi);
-  (void)pzErrMsg;  /* Unused parameter */
-  rc = sqlite3_create_function(db, "next_char", 3, SQLITE_UTF8, 0,
-                               nextCharFunc, 0, 0);
-  if( rc==SQLITE_OK ){
-    rc = sqlite3_create_function(db, "next_char", 4, SQLITE_UTF8, 0,
-                                 nextCharFunc, 0, 0);
-  }
-  if( rc==SQLITE_OK ){
-    rc = sqlite3_create_function(db, "next_char", 5, SQLITE_UTF8, 0,
-                                 nextCharFunc, 0, 0);
-  }
-  return rc;
-}