From: drh <>
Date: Sun, 22 Feb 2026 20:44:52 +0000 (+0000)
Subject: Add the realpath() SQL function to the fileio.c extension.  And clean up
X-Git-Tag: version-3.52.0~44
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bc017423c5f841eb55a3d9e711356c19ac86dd5;p=thirdparty%2Fsqlite.git

Add the realpath() SQL function to the fileio.c extension.  And clean up
the UTF8 handling on the Windows side of that extension while we are at it.

FossilOrigin-Name: 8bb8941930378b436f1353603be194644568b55fe347475be0caddddad40efa3
---

diff --git a/ext/misc/fileio.c b/ext/misc/fileio.c
index db3fd6c3fd..876b397c70 100644
--- a/ext/misc/fileio.c
+++ b/ext/misc/fileio.c
@@ -100,6 +100,8 @@ SQLITE_EXTENSION_INIT1
 #  define STRUCT_STAT struct _stat
 #  define chmod(path,mode) fileio_chmod(path,mode)
 #  define mkdir(path,mode) fileio_mkdir(path)
+   extern LPWSTR sqlite3_win32_utf8_to_unicode(const char*);
+   extern char *sqlite3_win32_unicode_to_utf8(LPCWSTR);
 #endif
 #include <time.h>
 #include <errno.h>
@@ -131,12 +133,9 @@ SQLITE_EXTENSION_INIT1
 */
 #if defined(_WIN32) || defined(WIN32)
 static int fileio_chmod(const char *zPath, int pmode){
-  sqlite3_int64 sz = strlen(zPath);
-  wchar_t *b1 = sqlite3_malloc64( (sz+1)*sizeof(b1[0]) );
   int rc;
+  wchar_t *b1 = sqlite3_win32_utf8_to_unicode(zPath);
   if( b1==0 ) return -1;
-  sz = MultiByteToWideChar(CP_UTF8, 0, zPath, sz, b1, sz);
-  b1[sz] = 0;
   rc = _wchmod(b1, pmode);
   sqlite3_free(b1);
   return rc;
@@ -148,12 +147,9 @@ static int fileio_chmod(const char *zPath, int pmode){
 */
 #if defined(_WIN32) || defined(WIN32)
 static int fileio_mkdir(const char *zPath){
-  sqlite3_int64 sz = strlen(zPath);
-  wchar_t *b1 = sqlite3_malloc64( (sz+1)*sizeof(b1[0]) );
   int rc;
+  wchar_t *b1 = sqlite3_win32_utf8_to_unicode(zPath);
   if( b1==0 ) return -1;
-  sz = MultiByteToWideChar(CP_UTF8, 0, zPath, sz, b1, sz);
-  b1[sz] = 0;
   rc = _wmkdir(b1);
   sqlite3_free(b1);
   return rc;
@@ -266,50 +262,7 @@ static sqlite3_uint64 fileTimeToUnixTime(
 
   return (fileIntervals.QuadPart - epochIntervals.QuadPart) / 10000000;
 }
-
-
-#if defined(FILEIO_WIN32_DLL) && (defined(_WIN32) || defined(WIN32))
-#  /* To allow a standalone DLL, use this next replacement function: */
-#  undef sqlite3_win32_utf8_to_unicode
-#  define sqlite3_win32_utf8_to_unicode utf8_to_utf16
-#
-LPWSTR utf8_to_utf16(const char *z){
-  int nAllot = MultiByteToWideChar(CP_UTF8, 0, z, -1, NULL, 0);
-  LPWSTR rv = sqlite3_malloc(nAllot * sizeof(WCHAR));
-  if( rv!=0 && 0 < MultiByteToWideChar(CP_UTF8, 0, z, -1, rv, nAllot) )
-    return rv;
-  sqlite3_free(rv);
-  return 0;
-}
-#endif
-
-/*
-** This function attempts to normalize the time values found in the stat()
-** buffer to UTC.  This is necessary on Win32, where the runtime library
-** appears to return these values as local times.
-*/
-static void statTimesToUtc(
-  const char *zPath,
-  STRUCT_STAT *pStatBuf
-){
-  HANDLE hFindFile;
-  WIN32_FIND_DATAW fd;
-  LPWSTR zUnicodeName;
-  extern LPWSTR sqlite3_win32_utf8_to_unicode(const char*);
-  zUnicodeName = sqlite3_win32_utf8_to_unicode(zPath);
-  if( zUnicodeName ){
-    memset(&fd, 0, sizeof(WIN32_FIND_DATAW));
-    hFindFile = FindFirstFileW(zUnicodeName, &fd);
-    if( hFindFile!=NULL ){
-      pStatBuf->st_ctime = (time_t)fileTimeToUnixTime(&fd.ftCreationTime);
-      pStatBuf->st_atime = (time_t)fileTimeToUnixTime(&fd.ftLastAccessTime);
-      pStatBuf->st_mtime = (time_t)fileTimeToUnixTime(&fd.ftLastWriteTime);
-      FindClose(hFindFile);
-    }
-    sqlite3_free(zUnicodeName);
-  }
-}
-#endif
+#endif /* _WIN32 */
 
 /*
 ** This function is used in place of stat().  On Windows, special handling
@@ -321,14 +274,22 @@ static int fileStat(
   STRUCT_STAT *pStatBuf
 ){
 #if defined(_WIN32)
-  sqlite3_int64 sz = strlen(zPath);
-  wchar_t *b1 = sqlite3_malloc64( (sz+1)*sizeof(b1[0]) );
   int rc;
+  wchar_t *b1 = sqlite3_win32_utf8_to_unicode(zPath);
   if( b1==0 ) return 1;
-  sz = MultiByteToWideChar(CP_UTF8, 0, zPath, sz, b1, sz);
-  b1[sz] = 0;
   rc = _wstat(b1, pStatBuf);
-  if( rc==0 ) statTimesToUtc(zPath, pStatBuf);
+  if( rc==0 ){
+    HANDLE hFindFile;
+    WIN32_FIND_DATAW fd;
+    memset(&fd, 0, sizeof(WIN32_FIND_DATAW));
+    hFindFile = FindFirstFileW(b1, &fd);
+    if( hFindFile!=NULL ){
+      pStatBuf->st_ctime = (time_t)fileTimeToUnixTime(&fd.ftCreationTime);
+      pStatBuf->st_atime = (time_t)fileTimeToUnixTime(&fd.ftLastAccessTime);
+      pStatBuf->st_mtime = (time_t)fileTimeToUnixTime(&fd.ftLastWriteTime);
+      FindClose(hFindFile);
+    }
+  }
   sqlite3_free(b1);
   return rc;
 #else
@@ -1093,6 +1054,74 @@ static int fsdirRegister(sqlite3 *db){
 # define fsdirRegister(x) SQLITE_OK
 #endif
 
+/*
+** The realpath() C-language function, implemented as an SQL function.
+*/
+static void realpathFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+#if !defined(_WIN32)       /* BEGIN unix */
+
+  const char *zPath;       /* Input */
+  char *zOut = 0;          /* Result */
+  char *z = 0;             /* Temporary buffer */
+#if defined(PATH_MAX)
+  char zBuf[PATH_MAX+1];   /* Space for the temporary buffer */
+#endif
+
+  (void)argc;
+  zPath = (const char*)sqlite3_value_text(argv[0]);
+  if( zPath==0 ) return;
+
+#if defined(PATH_MAX)
+  z = realpath(zPath, zBuf);
+  if( z ){
+    zOut = sqlite3_mprintf("%s", zBuf);
+  }
+#endif /* defined(PATH_MAX) */
+  if( zOut==0 ){
+    /* Try POSIX.1-2008 malloc behavior */
+    z = realpath(zPath, NULL);
+    if( z ){
+      zOut = sqlite3_mprintf("%s", z);
+      free(z);
+    }
+  }
+
+#else /* End UNIX, Begin WINDOWS */
+
+  const char *zPath;       /* Input */
+  wchar_t *zPath16;        /* UTF16 translation of zPath */
+  char *zOut = 0;          /* Result */
+  wchar_t *z = 0;          /* Temporary buffer */
+
+  (void)argc;
+  zPath = (const char*)sqlite3_value_text(argv[0]);
+  if( zPath==0 ) return;
+
+  zPath16 = sqlite3_win32_utf8_to_unicode(zPath);
+  if( zPath16==0 ) return;
+  z = _wfullpath(NULL, zPath16, 0);
+  sqlite3_free(zPath16);
+  if( z==0 ){
+    sqlite3_result_error(context, "unable to resolve path", -1);
+    return;
+  }
+  zOut = sqlite3_win32_unicode_to_utf8(z);
+  free(z);
+
+#endif /* End WINDOWS, Begin common code */
+
+  if( zOut==0 ){
+    sqlite3_result_error(context, "unable to resolve path", -1);
+    return;
+  }
+  sqlite3_result_text(context, zOut, -1, sqlite3_free);
+}
+
+
 #ifdef _WIN32
 __declspec(dllexport)
 #endif
@@ -1119,5 +1148,11 @@ int sqlite3_fileio_init(
   if( rc==SQLITE_OK ){
     rc = fsdirRegister(db);
   }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "realpath", 1,
+                                 SQLITE_UTF8, 0,
+                                 realpathFunc, 0, 0);
+  }
+
   return rc;
 }
diff --git a/manifest b/manifest
index 20186b546e..93d063c618 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\stypos\sand\sinclude\swording\sin\sthe\sdocumentation\sfor\nSQLITE_DBCONFIG_FP_DIGITS.
-D 2026-02-21T21:19:41.549
+C Add\sthe\srealpath()\sSQL\sfunction\sto\sthe\sfileio.c\sextension.\s\sAnd\sclean\sup\nthe\sUTF8\shandling\son\sthe\sWindows\sside\sof\sthat\sextension\swhile\swe\sare\sat\sit.
+D 2026-02-22T20:44:52.610
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -373,7 +373,7 @@ F ext/misc/dbdump.c 678f1b9ae2317b4473f65d03132a2482c3f4b08920799ed80feedd2941a0
 F ext/misc/decimal.c e1da22eee70d7e3eaa99a6b761bc03c4d01d7ffa554bf3178b1f1f184932806c
 F ext/misc/eval.c 04bc9aada78c888394204b4ed996ab834b99726fb59603b0ee3ed6e049755dc1
 F ext/misc/explain.c 606100185fb90d6a1eade1ed0414d53503c86820d8956a06e3b0a56291894f2b
-F ext/misc/fileio.c 452300ca34fadafd2bb9eb09557de5a518da1fd2349f9f9cedd22b1566a7164f
+F ext/misc/fileio.c 6bbde149252e989fce657bfba66754dd7c545311546292cf33976e6b455a658c
 F ext/misc/fossildelta.c 86dfa83f85f7ccd640591d8a5c6865346d0c2ee6a949d78591eceb892f1cbfec
 F ext/misc/fuzzer.c 6b231352815304ba60d8e9ec2ee73d4918e74d9b76bda8940ba2b64e8777515e
 F ext/misc/ieee754.c 2901d08a586d00a1d3c0fd89e03c57ee9e2b5f013b0daab9e49c7a48a9d5946b
@@ -2195,8 +2195,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh d924598cf2f55a4ecbc2aeb055c10bd5f48114793e7ba25f9585435da29e7e98
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P f16c7c4000f2b992f7245dcaf669f13ed464579f8894f3c16842eebf41285c70
-R 944ea7c224f9333bdc2c56f7b2ed487a
+P c30cee1224904eb2092daa0ad9494aec7c7a8c6c1661f5b91b62c3ef0c5ea95b
+R a026dfab96aebae2bd7cee1e81138b75
 U drh
-Z ef2f611c8a724472ddbfbfc7d613ba7b
+Z 7731fd8c09c5128d6fba3a643ba9f80c
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 7193b3ed74..4077fe2836 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c30cee1224904eb2092daa0ad9494aec7c7a8c6c1661f5b91b62c3ef0c5ea95b
+8bb8941930378b436f1353603be194644568b55fe347475be0caddddad40efa3