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calog/vendor/tcl/generic/tclPkg.c
Scott Duensing efc1c17d4a TCL added.
2026-07-04 23:22:22 -05:00

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/*
* tclPkg.c --
*
* This file implements package and version control for Tcl via the
* "package" command and a few C APIs.
*
* Copyright © 1996 Sun Microsystems, Inc.
* Copyright © 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* TIP #268.
* Heavily rewritten to handle the extend version numbers, and extended
* package requirements.
*/
#include "tclInt.h"
MODULE_SCOPE char *tclEmptyStringRep;
char *tclEmptyStringRep = &tclEmptyString;
/*
* Each invocation of the "package ifneeded" command creates a structure of
* the following type, which is used to load the package into the interpreter
* if it is requested with a "package require" command.
*/
typedef struct PkgAvail {
char *version; /* Version string; malloc'ed. */
char *script; /* Script to invoke to provide this version of
* the package. Malloc'ed and protected by
* Tcl_Preserve and Tcl_Release. */
char *pkgIndex; /* Full file name of pkgIndex file */
struct PkgAvail *nextPtr; /* Next in list of available versions of the
* same package. */
} PkgAvail;
typedef struct PkgName {
struct PkgName *nextPtr; /* Next in list of package names being
* initialized. */
char name[TCLFLEXARRAY];
} PkgName;
typedef struct PkgFiles {
PkgName *names; /* Package names being initialized. Must be
* first field. */
Tcl_HashTable table; /* Table which contains files for each
* package. */
} PkgFiles;
/*
* For each package that is known in any way to an interpreter, there is one
* record of the following type. These records are stored in the
* "packageTable" hash table in the interpreter, keyed by package name such as
* "Tk" (no version number).
*/
typedef struct {
Tcl_Obj *version;
PkgAvail *availPtr; /* First in list of all available versions of
* this package. */
const void *clientData; /* Client data. */
} Package;
typedef struct Require {
void *clientDataPtr;
const char *name;
Package *pkgPtr;
char *versionToProvide;
} Require;
typedef struct RequireProcArgs {
const char *name;
void *clientDataPtr;
} RequireProcArgs;
/*
* Prototypes for functions defined in this file:
*/
static int CheckVersionAndConvert(Tcl_Interp *interp,
const char *string, char **internal, int *stable);
static int CompareVersions(char *v1i, char *v2i,
int *isMajorPtr);
static int CheckRequirement(Tcl_Interp *interp,
const char *string);
static int CheckAllRequirements(Tcl_Interp *interp, int reqc,
Tcl_Obj *const reqv[]);
static int RequirementSatisfied(char *havei, const char *req);
static int SomeRequirementSatisfied(char *havei, int reqc,
Tcl_Obj *const reqv[]);
static void AddRequirementsToResult(Tcl_Interp *interp, int reqc,
Tcl_Obj *const reqv[]);
static void AddRequirementsToDString(Tcl_DString *dstring,
int reqc, Tcl_Obj *const reqv[]);
static Package * FindPackage(Tcl_Interp *interp, const char *name);
static int PkgRequireCore(void *data[], Tcl_Interp *interp, int result);
static int PkgRequireCoreFinal(void *data[], Tcl_Interp *interp, int result);
static int PkgRequireCoreCleanup(void *data[], Tcl_Interp *interp, int result);
static int PkgRequireCoreStep1(void *data[], Tcl_Interp *interp, int result);
static int PkgRequireCoreStep2(void *data[], Tcl_Interp *interp, int result);
static int TclNRPkgRequireProc(void *clientData, Tcl_Interp *interp, int reqc, Tcl_Obj *const reqv[]);
static int SelectPackage(void *data[], Tcl_Interp *interp, int result);
static int SelectPackageFinal(void *data[], Tcl_Interp *interp, int result);
static int TclNRPackageObjCmdCleanup(void *data[], Tcl_Interp *interp, int result);
/*
* Helper macros.
*/
#define DupBlock(v,s,len) \
((v) = (char *)Tcl_Alloc(len), memcpy((v),(s),(len)))
#define DupString(v,s) \
do { \
size_t local__len = strlen(s) + 1; \
DupBlock((v),(s),local__len); \
} while (0)
/*
*----------------------------------------------------------------------
*
* Tcl_PkgProvide / Tcl_PkgProvideEx --
*
* This function is invoked to declare that a particular version of a
* particular package is now present in an interpreter. There must not be
* any other version of this package already provided in the interpreter.
*
* Results:
* Normally returns TCL_OK; if there is already another version of the
* package loaded then TCL_ERROR is returned and an error message is left
* in the interp's result.
*
* Side effects:
* The interpreter remembers that this package is available, so that no
* other version of the package may be provided for the interpreter.
*
*----------------------------------------------------------------------
*/
#undef Tcl_PkgProvide
int
Tcl_PkgProvide(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of package. */
const char *version) /* Version string for package. */
{
return Tcl_PkgProvideEx(interp, name, version, NULL);
}
int
Tcl_PkgProvideEx(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of package. */
const char *version, /* Version string for package. */
const void *clientData) /* clientdata for this package (normally used
* for C callback function table) */
{
Package *pkgPtr;
char *pvi, *vi;
int res;
pkgPtr = FindPackage(interp, name);
if (pkgPtr->version == NULL) {
pkgPtr->version = Tcl_NewStringObj(version, -1);
Tcl_IncrRefCount(pkgPtr->version);
pkgPtr->clientData = clientData;
return TCL_OK;
}
if (CheckVersionAndConvert(interp, Tcl_GetString(pkgPtr->version), &pvi,
NULL) != TCL_OK) {
return TCL_ERROR;
} else if (CheckVersionAndConvert(interp, version, &vi, NULL) != TCL_OK) {
Tcl_Free(pvi);
return TCL_ERROR;
}
res = CompareVersions(pvi, vi, NULL);
Tcl_Free(pvi);
Tcl_Free(vi);
if (res == 0) {
if (clientData != NULL) {
pkgPtr->clientData = clientData;
}
return TCL_OK;
}
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"conflicting versions provided for package \"%s\": %s, then %s",
name, Tcl_GetString(pkgPtr->version), version));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "VERSIONCONFLICT", (char *)NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PkgRequire / Tcl_PkgRequireEx / Tcl_PkgRequireProc --
*
* This function is called by code that depends on a particular version
* of a particular package. If the package is not already provided in the
* interpreter, this function invokes a Tcl script to provide it. If the
* package is already provided, this function makes sure that the
* caller's needs don't conflict with the version that is present.
*
* Results:
* If successful, returns the version string for the currently provided
* version of the package, which may be different from the "version"
* argument. If the caller's requirements cannot be met (e.g. the version
* requested conflicts with a currently provided version, or the required
* version cannot be found, or the script to provide the required version
* generates an error), NULL is returned and an error message is left in
* the interp's result.
*
* Side effects:
* The script from some previous "package ifneeded" command may be
* invoked to provide the package.
*
*----------------------------------------------------------------------
*/
static void
PkgFilesCleanupProc(
void *clientData,
TCL_UNUSED(Tcl_Interp *))
{
PkgFiles *pkgFiles = (PkgFiles *) clientData;
Tcl_HashSearch search;
Tcl_HashEntry *entry;
while (pkgFiles->names) {
PkgName *name = pkgFiles->names;
pkgFiles->names = name->nextPtr;
Tcl_Free(name);
}
entry = Tcl_FirstHashEntry(&pkgFiles->table, &search);
while (entry) {
Tcl_Obj *obj = (Tcl_Obj *)Tcl_GetHashValue(entry);
Tcl_DecrRefCount(obj);
entry = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(&pkgFiles->table);
Tcl_Free(pkgFiles);
return;
}
void *
TclInitPkgFiles(
Tcl_Interp *interp)
{
/*
* If assocdata "tclPkgFiles" doesn't exist yet, create it.
*/
PkgFiles *pkgFiles = (PkgFiles *)Tcl_GetAssocData(interp, "tclPkgFiles", NULL);
if (!pkgFiles) {
pkgFiles = (PkgFiles *)Tcl_Alloc(sizeof(PkgFiles));
pkgFiles->names = NULL;
Tcl_InitHashTable(&pkgFiles->table, TCL_STRING_KEYS);
Tcl_SetAssocData(interp, "tclPkgFiles", PkgFilesCleanupProc, pkgFiles);
}
return pkgFiles;
}
void
TclPkgFileSeen(
Tcl_Interp *interp,
const char *fileName)
{
PkgFiles *pkgFiles = (PkgFiles *)
Tcl_GetAssocData(interp, "tclPkgFiles", NULL);
if (pkgFiles && pkgFiles->names) {
const char *name = pkgFiles->names->name;
Tcl_HashTable *table = &pkgFiles->table;
int isNew;
Tcl_HashEntry *entry = (Tcl_HashEntry *)Tcl_CreateHashEntry(table, name, &isNew);
Tcl_Obj *list;
if (isNew) {
TclNewObj(list);
Tcl_SetHashValue(entry, list);
Tcl_IncrRefCount(list);
} else {
list = (Tcl_Obj *)Tcl_GetHashValue(entry);
}
Tcl_ListObjAppendElement(interp, list, Tcl_NewStringObj(fileName, -1));
}
}
#undef Tcl_PkgRequire
const char *
Tcl_PkgRequire(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of desired package. */
const char *version, /* Version string for desired version; NULL
* means use the latest version available. */
int exact) /* Non-zero means that only the particular
* version given is acceptable. Zero means use
* the latest compatible version. */
{
return Tcl_PkgRequireEx(interp, name, version, exact, NULL);
}
const char *
Tcl_PkgRequireEx(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of desired package. */
const char *version, /* Version string for desired version; NULL
* means use the latest version available. */
int exact, /* Non-zero means that only the particular
* version given is acceptable. Zero means use
* the latest compatible version. */
void *clientDataPtr) /* Used to return the client data for this
* package. If it is NULL then the client data
* is not returned. This is unchanged if this
* call fails for any reason. */
{
Tcl_Obj *ov;
const char *result = NULL;
/*
* If an attempt is being made to load this into a standalone executable
* on a platform where backlinking is not supported then this must be a
* shared version of Tcl (Otherwise the load would have failed). Detect
* this situation by checking that this library has been correctly
* initialised. If it has not been then return immediately as nothing will
* work.
*/
if (tclEmptyStringRep == NULL) {
/*
* OK, so what's going on here?
*
* First, what are we doing? We are performing a check on behalf of
* one particular caller, Tcl_InitStubs(). When a package is stub-
* enabled, it is statically linked to libtclstub.a, which contains a
* copy of Tcl_InitStubs(). When a stub-enabled package is loaded, its
* *_Init() function is supposed to call Tcl_InitStubs() before
* calling any other functions in the Tcl library. The first Tcl
* function called by Tcl_InitStubs() through the stub table is
* Tcl_PkgRequireEx(), so this code right here is the first code that
* is part of the original Tcl library in the executable that gets
* executed on behalf of a newly loaded stub-enabled package.
*
* One easy error for the developer/builder of a stub-enabled package
* to make is to forget to define USE_TCL_STUBS when compiling the
* package. When that happens, the package will contain symbols that
* are references to the Tcl library, rather than function pointers
* referencing the stub table. On platforms that lack backlinking,
* those unresolved references may cause the loading of the package to
* also load a second copy of the Tcl library, leading to all kinds of
* trouble. We would like to catch that error and report a useful
* message back to the user. That's what we're doing.
*
* Second, how does this work? If we reach this point, then the global
* variable tclEmptyStringRep has the value NULL. Compare that with
* the definition of tclEmptyStringRep near the top of this file. It
* clearly should not have the value NULL; it should point to the char
* tclEmptyString. If we see it having the value NULL, then somehow we
* are seeing a Tcl library that isn't completely initialized, and
* that's an indicator for the error condition described above.
* (Further explanation is welcome.)
*
* Third, so what do we do about it? This situation indicates the
* package we just loaded wasn't properly compiled to be stub-enabled,
* yet it thinks it is stub-enabled (it called Tcl_InitStubs()). We
* want to report that the package just loaded is broken, so we want
* to place an error message in the interpreter result and return NULL
* to indicate failure to Tcl_InitStubs() so that it will also fail.
* (Further explanation why we don't want to Tcl_Panic() is welcome.
* After all, two Tcl libraries can't be a good thing!)
*
* Trouble is that's going to be tricky. We're now using a Tcl library
* that's not fully initialized. Functions in it may not work
* reliably, so be very careful about adding any other calls here
* without checking how they behave when initialization is incomplete.
*/
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"Cannot load package \"%s\" in standalone executable:"
" This package is not compiled with stub support", name));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "UNSTUBBED", (char *)NULL);
return NULL;
}
/*
* Translate between old and new API, and defer to the new function.
*/
if (version == NULL) {
if (Tcl_PkgRequireProc(interp, name, 0, NULL, clientDataPtr) == TCL_OK) {
result = Tcl_GetStringResult(interp);
Tcl_ResetResult(interp);
}
} else {
if (exact && TCL_OK
!= CheckVersionAndConvert(interp, version, NULL, NULL)) {
return NULL;
}
ov = Tcl_NewStringObj(version, -1);
if (exact) {
Tcl_AppendStringsToObj(ov, "-", version, (char *)NULL);
}
Tcl_IncrRefCount(ov);
if (Tcl_PkgRequireProc(interp, name, 1, &ov, clientDataPtr) == TCL_OK) {
result = Tcl_GetStringResult(interp);
Tcl_ResetResult(interp);
}
TclDecrRefCount(ov);
}
return result;
}
int
Tcl_PkgRequireProc(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of desired package. */
Tcl_Size reqc, /* Requirements constraining the desired
* version. */
Tcl_Obj *const reqv[], /* 0 means to use the latest version
* available. */
void *clientDataPtr)
{
RequireProcArgs args;
args.name = name;
args.clientDataPtr = clientDataPtr;
return Tcl_NRCallObjProc(interp,
TclNRPkgRequireProc, (void *) &args, reqc, reqv);
}
static int
TclNRPkgRequireProc(
void *clientData,
Tcl_Interp *interp,
int reqc,
Tcl_Obj *const reqv[])
{
RequireProcArgs *args = (RequireProcArgs *)clientData;
Tcl_NRAddCallback(interp,
PkgRequireCore, (void *) args->name, INT2PTR(reqc), (void *) reqv,
args->clientDataPtr);
return TCL_OK;
}
static int
PkgRequireCore(
void *data[],
Tcl_Interp *interp,
TCL_UNUSED(int))
{
const char *name = (const char *)data[0];
int reqc = (int)PTR2INT(data[1]);
Tcl_Obj **reqv = (Tcl_Obj **)data[2];
int code = CheckAllRequirements(interp, reqc, reqv);
Require *reqPtr;
if (code != TCL_OK) {
return code;
}
reqPtr = (Require *)Tcl_Alloc(sizeof(Require));
Tcl_NRAddCallback(interp, PkgRequireCoreCleanup, reqPtr, NULL, NULL, NULL);
reqPtr->clientDataPtr = data[3];
reqPtr->name = name;
reqPtr->pkgPtr = FindPackage(interp, name);
if (reqPtr->pkgPtr->version == NULL) {
Tcl_NRAddCallback(interp,
SelectPackage, reqPtr, INT2PTR(reqc), reqv,
(void *)PkgRequireCoreStep1);
} else {
Tcl_NRAddCallback(interp,
PkgRequireCoreFinal, reqPtr, INT2PTR(reqc), reqv, NULL);
}
return TCL_OK;
}
static int
PkgRequireCoreStep1(
void *data[],
Tcl_Interp *interp,
TCL_UNUSED(int))
{
Tcl_DString command;
char *script;
Require *reqPtr = (Require *)data[0];
int reqc = (int)PTR2INT(data[1]);
Tcl_Obj **const reqv = (Tcl_Obj **)data[2];
const char *name = reqPtr->name /* Name of desired package. */;
/*
* If we've got the package in the DB already, go on to actually loading
* it.
*/
if (reqPtr->pkgPtr->version != NULL) {
Tcl_NRAddCallback(interp,
PkgRequireCoreFinal, reqPtr, INT2PTR(reqc), (void *)reqv, NULL);
return TCL_OK;
}
/*
* The package is not in the database. If there is a "package unknown"
* command, invoke it.
*/
script = ((Interp *) interp)->packageUnknown;
if (script == NULL) {
/*
* No package unknown script. Move on to finalizing.
*/
Tcl_NRAddCallback(interp,
PkgRequireCoreFinal, reqPtr, INT2PTR(reqc), (void *)reqv, NULL);
return TCL_OK;
}
/*
* Invoke the "package unknown" script synchronously.
*/
Tcl_DStringInit(&command);
Tcl_DStringAppend(&command, script, -1);
Tcl_DStringAppendElement(&command, name);
AddRequirementsToDString(&command, reqc, reqv);
Tcl_NRAddCallback(interp,
PkgRequireCoreStep2, reqPtr, INT2PTR(reqc), (void *) reqv, NULL);
Tcl_NREvalObj(interp, Tcl_DStringToObj(&command), TCL_EVAL_GLOBAL);
return TCL_OK;
}
static int
PkgRequireCoreStep2(
void *data[],
Tcl_Interp *interp,
int result)
{
Require *reqPtr = (Require *)data[0];
int reqc = (int)PTR2INT(data[1]);
Tcl_Obj **const reqv = (Tcl_Obj **)data[2];
const char *name = reqPtr->name; /* Name of desired package. */
if ((result != TCL_OK) && (result != TCL_ERROR)) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"bad return code: %d", result));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "BADRESULT", (char *)NULL);
result = TCL_ERROR;
}
if (result == TCL_ERROR) {
Tcl_AddErrorInfo(interp,
"\n (\"package unknown\" script)");
return result;
}
Tcl_ResetResult(interp);
/*
* pkgPtr may now be invalid, so refresh it.
*/
reqPtr->pkgPtr = FindPackage(interp, name);
Tcl_NRAddCallback(interp,
SelectPackage, reqPtr, INT2PTR(reqc), reqv,
(void *)PkgRequireCoreFinal);
return TCL_OK;
}
static int
PkgRequireCoreFinal(
void *data[],
Tcl_Interp *interp,
TCL_UNUSED(int))
{
Require *reqPtr = (Require *)data[0];
int reqc = (int)PTR2INT(data[1]), satisfies;
Tcl_Obj **const reqv = (Tcl_Obj **)data[2];
char *pkgVersionI;
void *clientDataPtr = reqPtr->clientDataPtr;
const char *name = reqPtr->name; /* Name of desired package. */
if (reqPtr->pkgPtr->version == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"can't find package %s", name));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "UNFOUND", (char *)NULL);
AddRequirementsToResult(interp, reqc, reqv);
return TCL_ERROR;
}
/*
* Ensure that the provided version meets the current requirements.
*/
if (reqc != 0) {
CheckVersionAndConvert(interp, Tcl_GetString(reqPtr->pkgPtr->version),
&pkgVersionI, NULL);
satisfies = SomeRequirementSatisfied(pkgVersionI, reqc, reqv);
Tcl_Free(pkgVersionI);
if (!satisfies) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"version conflict for package \"%s\": have %s, need",
name, Tcl_GetString(reqPtr->pkgPtr->version)));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "VERSIONCONFLICT",
(char *)NULL);
AddRequirementsToResult(interp, reqc, reqv);
return TCL_ERROR;
}
}
if (clientDataPtr) {
const void **ptr = (const void **) clientDataPtr;
*ptr = reqPtr->pkgPtr->clientData;
}
Tcl_SetObjResult(interp, reqPtr->pkgPtr->version);
return TCL_OK;
}
static int
PkgRequireCoreCleanup(
void *data[],
TCL_UNUSED(Tcl_Interp *),
int result)
{
Tcl_Free(data[0]);
return result;
}
static int
SelectPackage(
void *data[],
Tcl_Interp *interp,
TCL_UNUSED(int))
{
PkgAvail *availPtr, *bestPtr, *bestStablePtr;
char *availVersion, *bestVersion, *bestStableVersion;
/* Internal rep. of versions */
int availStable, satisfies;
Require *reqPtr = (Require *)data[0];
int reqc = (int)PTR2INT(data[1]);
Tcl_Obj **const reqv = (Tcl_Obj **)data[2];
const char *name = reqPtr->name;
Package *pkgPtr = reqPtr->pkgPtr;
Interp *iPtr = (Interp *) interp;
/*
* Check whether we're already attempting to load some version of this
* package (circular dependency detection).
*/
if (pkgPtr->clientData != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"circular package dependency:"
" attempt to provide %s %s requires %s",
name, (char *) pkgPtr->clientData, name));
AddRequirementsToResult(interp, reqc, reqv);
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "CIRCULARITY", (char *)NULL);
return TCL_ERROR;
}
/*
* The package isn't yet present. Search the list of available versions
* and invoke the script for the best available version. We are actually
* locating the best, and the best stable version. One of them is then
* chosen based on the selection mode.
*/
bestPtr = NULL;
bestStablePtr = NULL;
bestVersion = NULL;
bestStableVersion = NULL;
for (availPtr = pkgPtr->availPtr; availPtr != NULL;
availPtr = availPtr->nextPtr) {
if (CheckVersionAndConvert(interp, availPtr->version,
&availVersion, &availStable) != TCL_OK) {
/*
* The provided version number has invalid syntax. This should not
* happen. This should have been caught by the 'package ifneeded'
* registering the package.
*/
continue;
}
/*
* Check satisfaction of requirements before considering the current
* version further.
*/
if (reqc > 0) {
satisfies = SomeRequirementSatisfied(availVersion, reqc, reqv);
if (!satisfies) {
Tcl_Free(availVersion);
availVersion = NULL;
continue;
}
}
if (bestPtr != NULL) {
int res = CompareVersions(availVersion, bestVersion, NULL);
/*
* Note: Used internal reps in the comparison!
*/
if (res > 0) {
/*
* The version of the package sought is better than the
* currently selected version.
*/
Tcl_Free(bestVersion);
bestVersion = NULL;
goto newbest;
}
} else {
newbest:
/*
* We have found a version which is better than our max.
*/
bestPtr = availPtr;
CheckVersionAndConvert(interp, bestPtr->version, &bestVersion, NULL);
}
if (!availStable) {
Tcl_Free(availVersion);
availVersion = NULL;
continue;
}
if (bestStablePtr != NULL) {
int res = CompareVersions(availVersion, bestStableVersion, NULL);
/*
* Note: Used internal reps in the comparison!
*/
if (res > 0) {
/*
* This stable version of the package sought is better than
* the currently selected stable version.
*/
Tcl_Free(bestStableVersion);
bestStableVersion = NULL;
goto newstable;
}
} else {
newstable:
/*
* We have found a stable version which is better than our max
* stable.
*/
bestStablePtr = availPtr;
CheckVersionAndConvert(interp, bestStablePtr->version,
&bestStableVersion, NULL);
}
Tcl_Free(availVersion);
availVersion = NULL;
} /* end for */
/*
* Clean up memorized internal reps, if any.
*/
if (bestVersion != NULL) {
Tcl_Free(bestVersion);
bestVersion = NULL;
}
if (bestStableVersion != NULL) {
Tcl_Free(bestStableVersion);
bestStableVersion = NULL;
}
/*
* Now choose a version among the two best. For 'latest' we simply take
* (actually keep) the best. For 'stable' we take the best stable, if
* there is any, or the best if there is nothing stable.
*/
if ((iPtr->packagePrefer == PKG_PREFER_STABLE)
&& (bestStablePtr != NULL)) {
bestPtr = bestStablePtr;
}
if (bestPtr == NULL) {
Tcl_NRAddCallback(interp,
(Tcl_NRPostProc *)data[3], reqPtr, INT2PTR(reqc), (void *)reqv, NULL);
} else {
/*
* We found an ifneeded script for the package. Be careful while
* executing it: this could cause reentrancy, so (a) protect the
* script itself from deletion and (b) don't assume that bestPtr will
* still exist when the script completes.
*/
char *versionToProvide = bestPtr->version;
PkgFiles *pkgFiles;
PkgName *pkgName;
Tcl_Preserve(versionToProvide);
pkgPtr->clientData = versionToProvide;
pkgFiles = (PkgFiles *)TclInitPkgFiles(interp);
/*
* Push "ifneeded" package name in "tclPkgFiles" assocdata.
*/
pkgName = (PkgName *)Tcl_Alloc(offsetof(PkgName, name) + 1 + strlen(name));
pkgName->nextPtr = pkgFiles->names;
strcpy(pkgName->name, name);
pkgFiles->names = pkgName;
if (bestPtr->pkgIndex) {
TclPkgFileSeen(interp, bestPtr->pkgIndex);
}
reqPtr->versionToProvide = versionToProvide;
Tcl_NRAddCallback(interp,
SelectPackageFinal, reqPtr, INT2PTR(reqc), (void *)reqv,
data[3]);
Tcl_NREvalObj(interp, Tcl_NewStringObj(bestPtr->script, -1),
TCL_EVAL_GLOBAL);
}
return TCL_OK;
}
static int
SelectPackageFinal(
void *data[],
Tcl_Interp *interp,
int result)
{
Require *reqPtr = (Require *)data[0];
int reqc = (int)PTR2INT(data[1]);
Tcl_Obj **const reqv = (Tcl_Obj **)data[2];
const char *name = reqPtr->name;
char *versionToProvide = reqPtr->versionToProvide;
/*
* Pop the "ifneeded" package name from "tclPkgFiles" assocdata
*/
PkgFiles *pkgFiles = (PkgFiles *)Tcl_GetAssocData(interp, "tclPkgFiles", NULL);
PkgName *pkgName = pkgFiles->names;
pkgFiles->names = pkgName->nextPtr;
Tcl_Free(pkgName);
reqPtr->pkgPtr = FindPackage(interp, name);
if (result == TCL_OK) {
Tcl_ResetResult(interp);
if (reqPtr->pkgPtr->version == NULL) {
result = TCL_ERROR;
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"attempt to provide package %s %s failed:"
" no version of package %s provided",
name, versionToProvide, name));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "UNPROVIDED",
(char *)NULL);
} else {
char *pvi, *vi;
if (TCL_OK != CheckVersionAndConvert(interp,
Tcl_GetString(reqPtr->pkgPtr->version), &pvi, NULL)) {
result = TCL_ERROR;
} else if (CheckVersionAndConvert(interp,
versionToProvide, &vi, NULL) != TCL_OK) {
Tcl_Free(pvi);
result = TCL_ERROR;
} else {
int res = CompareVersions(pvi, vi, NULL);
Tcl_Free(pvi);
Tcl_Free(vi);
if (res != 0) {
result = TCL_ERROR;
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"attempt to provide package %s %s failed:"
" package %s %s provided instead",
name, versionToProvide,
name, Tcl_GetString(reqPtr->pkgPtr->version)));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE",
"WRONGPROVIDE", (char *)NULL);
}
}
}
} else if (result != TCL_ERROR) {
Tcl_Obj *codePtr;
TclNewIntObj(codePtr, result);
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"attempt to provide package %s %s failed:"
" bad return code: %s",
name, versionToProvide, TclGetString(codePtr)));
Tcl_SetErrorCode(interp, "TCL", "PACKAGE", "BADRESULT", (char *)NULL);
TclDecrRefCount(codePtr);
result = TCL_ERROR;
}
if (result == TCL_ERROR) {
Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
"\n (\"package ifneeded %s %s\" script)",
name, versionToProvide));
}
Tcl_Release(versionToProvide);
if (result != TCL_OK) {
/*
* Take a non-TCL_OK code from the script as an indication the package
* wasn't loaded properly, so the package system should not remember
* an improper load.
*
* This is consistent with our returning NULL. If we're not willing to
* tell our caller we got a particular version, we shouldn't store
* that version for telling future callers either.
*/
if (reqPtr->pkgPtr->version != NULL) {
Tcl_DecrRefCount(reqPtr->pkgPtr->version);
reqPtr->pkgPtr->version = NULL;
}
reqPtr->pkgPtr->clientData = NULL;
return result;
}
Tcl_NRAddCallback(interp,
(Tcl_NRPostProc *)data[3], reqPtr, INT2PTR(reqc), (void *) reqv, NULL);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PkgPresent / Tcl_PkgPresentEx --
*
* Checks to see whether the specified package is present. If it is not
* then no additional action is taken.
*
* Results:
* If successful, returns the version string for the currently provided
* version of the package, which may be different from the "version"
* argument. If the caller's requirements cannot be met (e.g. the version
* requested conflicts with a currently provided version), NULL is
* returned and an error message is left in interp->result.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
#undef Tcl_PkgPresent
const char *
Tcl_PkgPresent(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of desired package. */
const char *version, /* Version string for desired version; NULL
* means use the latest version available. */
int exact) /* Non-zero means that only the particular
* version given is acceptable. Zero means use
* the latest compatible version. */
{
return Tcl_PkgPresentEx(interp, name, version, exact, NULL);
}
const char *
Tcl_PkgPresentEx(
Tcl_Interp *interp, /* Interpreter in which package is now
* available. */
const char *name, /* Name of desired package. */
const char *version, /* Version string for desired version; NULL
* means use the latest version available. */
int exact, /* Non-zero means that only the particular
* version given is acceptable. Zero means use
* the latest compatible version. */
void *clientDataPtr) /* Used to return the client data for this
* package. If it is NULL then the client data
* is not returned. This is unchanged if this
* call fails for any reason. */
{
Interp *iPtr = (Interp *) interp;
Tcl_HashEntry *hPtr;
Package *pkgPtr;
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, name);
if (hPtr) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
if (pkgPtr->version != NULL) {
/*
* At this point we know that the package is present. Make sure
* that the provided version meets the current requirement by
* calling Tcl_PkgRequireEx() to check for us.
*/
const char *foundVersion = Tcl_PkgRequireEx(interp, name, version,
exact, clientDataPtr);
if (foundVersion == NULL) {
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PACKAGE", name,
(char *)NULL);
}
return foundVersion;
}
}
if (version != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"package %s %s is not present", name, version));
} else {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"package %s is not present", name));
}
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PACKAGE", name, (char *)NULL);
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PackageObjCmd --
*
* This function is invoked to process the "package" Tcl command. See the
* user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
int
Tcl_PackageObjCmd(
void *clientData,
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
return Tcl_NRCallObjProc(interp, TclNRPackageObjCmd, clientData, objc, objv);
}
int
TclNRPackageObjCmd(
TCL_UNUSED(void *),
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
static const char *const pkgOptions[] = {
"files", "forget", "ifneeded", "names", "prefer",
"present", "provide", "require", "unknown", "vcompare",
"versions", "vsatisfies", NULL
};
enum pkgOptionsEnum {
PKG_FILES, PKG_FORGET, PKG_IFNEEDED, PKG_NAMES, PKG_PREFER,
PKG_PRESENT, PKG_PROVIDE, PKG_REQUIRE, PKG_UNKNOWN, PKG_VCOMPARE,
PKG_VERSIONS, PKG_VSATISFIES
} optionIndex;
Interp *iPtr = (Interp *) interp;
int exact, satisfies;
Tcl_Size i, newobjc;
PkgAvail *availPtr, *prevPtr;
Package *pkgPtr;
Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
Tcl_HashTable *tablePtr;
const char *version;
const char *argv2, *argv3, *argv4;
char *iva = NULL, *ivb = NULL;
Tcl_Obj *objvListPtr, **newObjvPtr;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], pkgOptions, "option", 0,
&optionIndex) != TCL_OK) {
return TCL_ERROR;
}
switch (optionIndex) {
case PKG_FILES: {
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "package");
return TCL_ERROR;
}
PkgFiles *pkgFiles = (PkgFiles *)
Tcl_GetAssocData(interp, "tclPkgFiles", NULL);
if (pkgFiles) {
Tcl_HashEntry *entry = Tcl_FindHashEntry(&pkgFiles->table,
TclGetString(objv[2]));
if (entry) {
Tcl_SetObjResult(interp, (Tcl_Obj *)Tcl_GetHashValue(entry));
}
}
break;
}
case PKG_FORGET: {
PkgFiles *pkgFiles = (PkgFiles *)
Tcl_GetAssocData(interp, "tclPkgFiles", NULL);
for (i = 2; i < objc; i++) {
const char *keyString = TclGetString(objv[i]);
if (pkgFiles) {
hPtr = Tcl_FindHashEntry(&pkgFiles->table, keyString);
if (hPtr) {
Tcl_Obj *obj = (Tcl_Obj *)Tcl_GetHashValue(hPtr);
Tcl_DeleteHashEntry(hPtr);
Tcl_DecrRefCount(obj);
}
}
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, keyString);
if (hPtr == NULL) {
continue;
}
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
Tcl_DeleteHashEntry(hPtr);
if (pkgPtr->version != NULL) {
Tcl_DecrRefCount(pkgPtr->version);
}
while (pkgPtr->availPtr != NULL) {
availPtr = pkgPtr->availPtr;
pkgPtr->availPtr = availPtr->nextPtr;
Tcl_EventuallyFree(availPtr->version, TCL_DYNAMIC);
Tcl_EventuallyFree(availPtr->script, TCL_DYNAMIC);
if (availPtr->pkgIndex) {
Tcl_EventuallyFree(availPtr->pkgIndex, TCL_DYNAMIC);
availPtr->pkgIndex = NULL;
}
Tcl_Free(availPtr);
}
Tcl_Free(pkgPtr);
}
break;
}
case PKG_IFNEEDED: {
Tcl_Size length;
char *argv3i;
if ((objc != 4) && (objc != 5)) {
Tcl_WrongNumArgs(interp, 2, objv, "package version ?script?");
return TCL_ERROR;
}
argv3 = TclGetString(objv[3]);
if (CheckVersionAndConvert(interp, argv3, &argv3i, NULL) != TCL_OK) {
return TCL_ERROR;
}
argv2 = TclGetString(objv[2]);
if (objc == 4) {
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv2);
if (hPtr == NULL) {
Tcl_Free(argv3i);
return TCL_OK;
}
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
} else {
pkgPtr = FindPackage(interp, argv2);
}
argv3 = TclGetStringFromObj(objv[3], &length);
for (availPtr = pkgPtr->availPtr, prevPtr = NULL; availPtr != NULL;
prevPtr = availPtr, availPtr = availPtr->nextPtr) {
char *avi;
if (CheckVersionAndConvert(interp, availPtr->version, &avi,
NULL) != TCL_OK) {
Tcl_Free(argv3i);
return TCL_ERROR;
}
int res = CompareVersions(avi, argv3i, NULL);
Tcl_Free(avi);
if (res == 0) {
if (objc == 4) {
Tcl_Free(argv3i);
Tcl_SetObjResult(interp,
Tcl_NewStringObj(availPtr->script, -1));
return TCL_OK;
}
Tcl_EventuallyFree(availPtr->script, TCL_DYNAMIC);
if (availPtr->pkgIndex) {
Tcl_EventuallyFree(availPtr->pkgIndex, TCL_DYNAMIC);
availPtr->pkgIndex = NULL;
}
break;
}
}
Tcl_Free(argv3i);
if (objc == 4) {
return TCL_OK;
}
if (availPtr == NULL) {
availPtr = (PkgAvail *)Tcl_Alloc(sizeof(PkgAvail));
availPtr->pkgIndex = NULL;
DupBlock(availPtr->version, argv3, length + 1);
if (prevPtr == NULL) {
availPtr->nextPtr = pkgPtr->availPtr;
pkgPtr->availPtr = availPtr;
} else {
availPtr->nextPtr = prevPtr->nextPtr;
prevPtr->nextPtr = availPtr;
}
}
if (iPtr->scriptFile) {
argv4 = TclGetStringFromObj(iPtr->scriptFile, &length);
DupBlock(availPtr->pkgIndex, argv4, length + 1);
}
argv4 = TclGetStringFromObj(objv[4], &length);
DupBlock(availPtr->script, argv4, length + 1);
break;
}
case PKG_NAMES:
if (objc != 2) {
Tcl_WrongNumArgs(interp, 2, objv, NULL);
return TCL_ERROR;
} else {
Tcl_Obj *resultObj;
TclNewObj(resultObj);
tablePtr = &iPtr->packageTable;
for (hPtr = Tcl_FirstHashEntry(tablePtr, &search); hPtr != NULL;
hPtr = Tcl_NextHashEntry(&search)) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
if ((pkgPtr->version != NULL) || (pkgPtr->availPtr != NULL)) {
Tcl_ListObjAppendElement(NULL,resultObj, Tcl_NewStringObj(
(char *)Tcl_GetHashKey(tablePtr, hPtr), -1));
}
}
Tcl_SetObjResult(interp, resultObj);
}
break;
case PKG_PRESENT: {
const char *name;
if (objc < 3) {
goto require;
}
argv2 = TclGetString(objv[2]);
if ((argv2[0] == '-') && (strcmp(argv2, "-exact") == 0)) {
if (objc != 5) {
goto requireSyntax;
}
exact = 1;
name = TclGetString(objv[3]);
} else {
exact = 0;
name = argv2;
}
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, name);
if (hPtr != NULL) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
if (pkgPtr->version != NULL) {
goto require;
}
}
version = NULL;
if (exact) {
version = TclGetString(objv[4]);
if (CheckVersionAndConvert(interp, version, NULL,
NULL) != TCL_OK) {
return TCL_ERROR;
}
} else {
if (CheckAllRequirements(interp, objc-3, objv+3) != TCL_OK) {
return TCL_ERROR;
}
if ((objc > 3) && (CheckVersionAndConvert(interp,
TclGetString(objv[3]), NULL, NULL) == TCL_OK)) {
version = TclGetString(objv[3]);
}
}
Tcl_PkgPresentEx(interp, name, version, exact, NULL);
return TCL_ERROR;
break;
}
case PKG_PROVIDE:
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "package ?version?");
return TCL_ERROR;
}
argv2 = TclGetString(objv[2]);
if (objc == 3) {
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv2);
if (hPtr != NULL) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
if (pkgPtr->version != NULL) {
Tcl_SetObjResult(interp, pkgPtr->version);
}
}
return TCL_OK;
}
argv3 = TclGetString(objv[3]);
if (CheckVersionAndConvert(interp, argv3, NULL, NULL) != TCL_OK) {
return TCL_ERROR;
}
return Tcl_PkgProvideEx(interp, argv2, argv3, NULL);
case PKG_REQUIRE:
require:
if (objc < 3) {
requireSyntax:
Tcl_WrongNumArgs(interp, 2, objv,
"?-exact? package ?requirement ...?");
return TCL_ERROR;
}
version = NULL;
argv2 = TclGetString(objv[2]);
if ((argv2[0] == '-') && (strcmp(argv2, "-exact") == 0)) {
Tcl_Obj *ov;
if (objc != 5) {
goto requireSyntax;
}
version = TclGetString(objv[4]);
if (CheckVersionAndConvert(interp, version, NULL,
NULL) != TCL_OK) {
return TCL_ERROR;
}
/*
* Create a new-style requirement for the exact version.
*/
ov = Tcl_NewStringObj(version, -1);
Tcl_AppendStringsToObj(ov, "-", version, (char *)NULL);
version = NULL;
argv3 = TclGetString(objv[3]);
Tcl_IncrRefCount(objv[3]);
objvListPtr = Tcl_NewListObj(0, NULL);
Tcl_IncrRefCount(objvListPtr);
Tcl_ListObjAppendElement(interp, objvListPtr, ov);
TclListObjGetElements(interp, objvListPtr, &newobjc, &newObjvPtr);
Tcl_NRAddCallback(interp,
TclNRPackageObjCmdCleanup, objv[3], objvListPtr, NULL,NULL);
Tcl_NRAddCallback(interp,
PkgRequireCore, (void *) argv3, INT2PTR(newobjc),
newObjvPtr, NULL);
return TCL_OK;
} else {
Tcl_Obj *const *newobjv = objv + 3;
newobjc = objc - 3;
if (CheckAllRequirements(interp, objc-3, objv+3) != TCL_OK) {
return TCL_ERROR;
}
objvListPtr = Tcl_NewListObj(0, NULL);
Tcl_IncrRefCount(objvListPtr);
Tcl_IncrRefCount(objv[2]);
for (i = 0; i < newobjc; i++) {
/*
* Tcl_Obj structures may have come from another interpreter,
* so duplicate them.
*/
Tcl_ListObjAppendElement(interp, objvListPtr,
Tcl_DuplicateObj(newobjv[i]));
}
TclListObjGetElements(interp, objvListPtr, &newobjc, &newObjvPtr);
Tcl_NRAddCallback(interp,
TclNRPackageObjCmdCleanup, objv[2], objvListPtr, NULL,NULL);
Tcl_NRAddCallback(interp,
PkgRequireCore, (void *) argv2, INT2PTR(newobjc),
newObjvPtr, NULL);
return TCL_OK;
}
break;
case PKG_UNKNOWN:
if (objc == 2) {
if (iPtr->packageUnknown != NULL) {
Tcl_SetObjResult(interp,
Tcl_NewStringObj(iPtr->packageUnknown, -1));
}
} else if (objc == 3) {
if (iPtr->packageUnknown != NULL) {
Tcl_Free(iPtr->packageUnknown);
}
Tcl_Size length;
argv2 = TclGetStringFromObj(objv[2], &length);
if (argv2[0] == 0) {
iPtr->packageUnknown = NULL;
} else {
DupBlock(iPtr->packageUnknown, argv2, length+1);
}
} else {
Tcl_WrongNumArgs(interp, 2, objv, "?command?");
return TCL_ERROR;
}
break;
case PKG_PREFER: {
static const char *const pkgPreferOptions[] = {
"latest", "stable", NULL
};
/*
* See tclInt.h for the enum, just before Interp.
*/
if (objc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?latest|stable?");
return TCL_ERROR;
} else if (objc == 3) {
/*
* Seting the value.
*/
int newPref;
if (Tcl_GetIndexFromObj(interp, objv[2], pkgPreferOptions,
"preference", 0, &newPref) != TCL_OK) {
return TCL_ERROR;
}
if (newPref < iPtr->packagePrefer) {
iPtr->packagePrefer = newPref;
}
}
/*
* Always return current value.
*/
Tcl_SetObjResult(interp,
Tcl_NewStringObj(pkgPreferOptions[iPtr->packagePrefer], -1));
break;
}
case PKG_VCOMPARE:
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "version1 version2");
return TCL_ERROR;
}
argv3 = TclGetString(objv[3]);
argv2 = TclGetString(objv[2]);
if (CheckVersionAndConvert(interp, argv2, &iva, NULL) != TCL_OK ||
CheckVersionAndConvert(interp, argv3, &ivb, NULL) != TCL_OK) {
if (iva != NULL) {
Tcl_Free(iva);
}
/*
* ivb cannot be set in this branch.
*/
return TCL_ERROR;
}
/*
* Comparison is done on the internal representation.
*/
Tcl_SetObjResult(interp,
Tcl_NewWideIntObj(CompareVersions(iva, ivb, NULL)));
Tcl_Free(iva);
Tcl_Free(ivb);
break;
case PKG_VERSIONS:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "package");
return TCL_ERROR;
} else {
Tcl_Obj *resultObj;
TclNewObj(resultObj);
argv2 = TclGetString(objv[2]);
hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv2);
if (hPtr != NULL) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
for (availPtr = pkgPtr->availPtr; availPtr != NULL;
availPtr = availPtr->nextPtr) {
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(availPtr->version, -1));
}
}
Tcl_SetObjResult(interp, resultObj);
}
break;
case PKG_VSATISFIES: {
char *argv2i = NULL;
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "version ?requirement ...?");
return TCL_ERROR;
}
argv2 = TclGetString(objv[2]);
if (CheckVersionAndConvert(interp, argv2, &argv2i, NULL) != TCL_OK) {
return TCL_ERROR;
} else if (CheckAllRequirements(interp, objc-3, objv+3) != TCL_OK) {
Tcl_Free(argv2i);
return TCL_ERROR;
}
satisfies = SomeRequirementSatisfied(argv2i, objc-3, objv+3);
Tcl_Free(argv2i);
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(satisfies));
break;
}
default:
TCL_UNREACHABLE();
}
return TCL_OK;
}
static int
TclNRPackageObjCmdCleanup(
void *data[],
TCL_UNUSED(Tcl_Interp *),
int result)
{
TclDecrRefCount((Tcl_Obj *) data[0]);
TclDecrRefCount((Tcl_Obj *) data[1]);
return result;
}
/*
*----------------------------------------------------------------------
*
* FindPackage --
*
* This function finds the Package record for a particular package in a
* particular interpreter, creating a record if one doesn't already
* exist.
*
* Results:
* The return value is a pointer to the Package record for the package.
*
* Side effects:
* A new Package record may be created.
*
*----------------------------------------------------------------------
*/
static Package *
FindPackage(
Tcl_Interp *interp, /* Interpreter to use for package lookup. */
const char *name) /* Name of package to fine. */
{
Interp *iPtr = (Interp *) interp;
Tcl_HashEntry *hPtr;
int isNew;
Package *pkgPtr;
hPtr = Tcl_CreateHashEntry(&iPtr->packageTable, name, &isNew);
if (isNew) {
pkgPtr = (Package *)Tcl_Alloc(sizeof(Package));
pkgPtr->version = NULL;
pkgPtr->availPtr = NULL;
pkgPtr->clientData = NULL;
Tcl_SetHashValue(hPtr, pkgPtr);
} else {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
}
return pkgPtr;
}
/*
*----------------------------------------------------------------------
*
* TclFreePackageInfo --
*
* This function is called during interpreter deletion to free all of the
* package-related information for the interpreter.
*
* Results:
* None.
*
* Side effects:
* Memory is freed.
*
*----------------------------------------------------------------------
*/
void
TclFreePackageInfo(
Interp *iPtr) /* Interpreter that is being deleted. */
{
Package *pkgPtr;
Tcl_HashSearch search;
Tcl_HashEntry *hPtr;
PkgAvail *availPtr;
for (hPtr = Tcl_FirstHashEntry(&iPtr->packageTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
pkgPtr = (Package *)Tcl_GetHashValue(hPtr);
if (pkgPtr->version != NULL) {
Tcl_DecrRefCount(pkgPtr->version);
}
while (pkgPtr->availPtr != NULL) {
availPtr = pkgPtr->availPtr;
pkgPtr->availPtr = availPtr->nextPtr;
Tcl_EventuallyFree(availPtr->version, TCL_DYNAMIC);
Tcl_EventuallyFree(availPtr->script, TCL_DYNAMIC);
if (availPtr->pkgIndex) {
Tcl_EventuallyFree(availPtr->pkgIndex, TCL_DYNAMIC);
availPtr->pkgIndex = NULL;
}
Tcl_Free(availPtr);
}
Tcl_Free(pkgPtr);
}
Tcl_DeleteHashTable(&iPtr->packageTable);
if (iPtr->packageUnknown != NULL) {
Tcl_Free(iPtr->packageUnknown);
}
}
/*
*----------------------------------------------------------------------
*
* CheckVersionAndConvert --
*
* This function checks to see whether a version number has valid syntax.
* It also generates a semi-internal representation (string rep of a list
* of numbers).
*
* Results:
* If string is a properly formed version number the TCL_OK is returned.
* Otherwise TCL_ERROR is returned and an error message is left in the
* interp's result.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
CheckVersionAndConvert(
Tcl_Interp *interp, /* Used for error reporting. */
const char *string, /* Supposedly a version number, which is
* groups of decimal digits separated by
* dots. */
char **internal, /* Internal normalized representation */
int *stable) /* Flag: Version is (un)stable. */
{
const char *p = string;
char prevChar;
int hasunstable = 0;
/*
* 4* assuming that each char is a separator (a,b become ' -x ').
* 4+ to have space for an additional -2 at the end
*/
char *ibuf = (char *)Tcl_Alloc(4 + 4*strlen(string));
char *ip = ibuf;
/*
* Basic rules
* (1) First character has to be a digit.
* (2) All other characters have to be a digit or '.'
* (3) Two '.'s may not follow each other.
*
* TIP 268, Modified rules
* (1) s.a.
* (2) All other characters have to be a digit, 'a', 'b', or '.'
* (3) s.a.
* (4) Only one of 'a' or 'b' may occur.
* (5) Neither 'a', nor 'b' may occur before or after a '.'
*/
if (!isdigit(UCHAR(*p))) { /* INTL: digit */
goto error;
}
*ip++ = *p;
for (prevChar = *p, p++; (*p != 0) && (*p != '+'); p++) {
if (!isdigit(UCHAR(*p)) && /* INTL: digit */
((*p!='.' && *p!='a' && *p!='b') ||
((hasunstable && (*p=='a' || *p=='b')) ||
((prevChar=='a' || prevChar=='b' || prevChar=='.')
&& (*p=='.')) ||
((*p=='a' || *p=='b' || *p=='.') && prevChar=='.')))) {
goto error;
}
if (*p == 'a' || *p == 'b') {
hasunstable = 1;
}
/*
* Translation to the internal rep. Regular version chars are copied
* as is. The separators are translated to numerics. The new separator
* for all parts is space.
*/
if (*p == '.') {
*ip++ = ' ';
*ip++ = '0';
*ip++ = ' ';
} else if (*p == 'a') {
*ip++ = ' ';
*ip++ = '-';
*ip++ = '2';
*ip++ = ' ';
} else if (*p == 'b') {
*ip++ = ' ';
*ip++ = '-';
*ip++ = '1';
*ip++ = ' ';
} else {
*ip++ = *p;
}
prevChar = *p;
}
if (prevChar!='.' && prevChar!='a' && prevChar!='b') {
*ip = '\0';
if (internal != NULL) {
*internal = ibuf;
} else {
Tcl_Free(ibuf);
}
if (stable != NULL) {
*stable = !hasunstable;
}
return TCL_OK;
}
error:
Tcl_Free(ibuf);
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"expected version number but got \"%s\"", string));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "VERSION", (char *)NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* CompareVersions --
*
* This function compares two version numbers (in internal rep).
*
* Results:
* The return value is -1 if v1 is less than v2, 0 if the two version
* numbers are the same, and 1 if v1 is greater than v2. If *satPtr is
* non-NULL, the word it points to is filled in with 1 if v2 >= v1 and
* both numbers have the same major number or 0 otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
CompareVersions(
char *v1, char *v2, /* Versions strings, of form 2.1.3 (any number
* of version numbers). */
int *isMajorPtr) /* If non-null, the word pointed to is filled
* in with a 0/1 value. 1 means that the
* difference occurred in the first element. */
{
int thisIsMajor, res, flip;
char *s1, *e1, *s2, *e2, o1, o2;
/*
* Each iteration of the following loop processes one number from each
* string, terminated by a " " (space). If those numbers don't match then
* the comparison is over; otherwise, we loop back for the next number.
*
* TIP 268.
* This is identical the function 'ComparePkgVersion', but using the new
* space separator as used by the internal rep of version numbers. The
* special separators 'a' and 'b' have already been dealt with in
* 'CheckVersionAndConvert', they were translated into numbers as well.
* This keeps the comparison sane. Otherwise we would have to compare
* numerics, the separators, and also deal with the special case of
* end-of-string compared to separators. The semi-list rep we get here is
* much easier to handle, as it is still regular.
*
* Rewritten to not compute a numeric value for the extracted version
* number, but do string comparison. Skip any leading zeros for that to
* work. This change breaks through the 32bit-limit on version numbers.
*/
thisIsMajor = 1;
s1 = v1;
s2 = v2;
while (1) {
/*
* Parse one decimal number from the front of each string. Skip
* leading zeros. Terminate found number for upcoming string-wise
* comparison, if needed.
*/
while ((*s1 != 0) && (*s1 == '0')) {
s1++;
}
while ((*s2 != 0) && (*s2 == '0')) {
s2++;
}
/*
* s1, s2 now point to the beginnings of the numbers to compare. Test
* for their signs first, as shortcut to the result (different signs),
* or determines if result has to be flipped (both negative). If there
* is no shortcut we have to insert terminators later to limit the
* strcmp.
*/
if ((*s1 == '-') && (*s2 != '-')) {
/* s1 < 0, s2 >= 0 => s1 < s2 */
res = -1;
break;
}
if ((*s1 != '-') && (*s2 == '-')) {
/* s1 >= 0, s2 < 0 => s1 > s2 */
res = 1;
break;
}
if ((*s1 == '-') && (*s2 == '-')) {
/* a < b => -a > -b, etc. */
s1++;
s2++;
flip = 1;
} else {
flip = 0;
}
/*
* The string comparison is needed, so now we determine where the
* numbers end.
*/
e1 = s1;
while ((*e1 != 0) && (*e1 != ' ')) {
e1++;
}
e2 = s2;
while ((*e2 != 0) && (*e2 != ' ')) {
e2++;
}
/*
* s1 .. e1 and s2 .. e2 now bracket the numbers to compare. Insert
* terminators, compare, and restore actual contents. First however
* another shortcut. Compare lengths. Shorter string is smaller
* number! Thus we strcmp only strings of identical length.
*/
if ((e1-s1) < (e2-s2)) {
res = -1;
} else if ((e2-s2) < (e1-s1)) {
res = 1;
} else {
o1 = *e1;
*e1 = '\0';
o2 = *e2;
*e2 = '\0';
res = strcmp(s1, s2);
res = (res < 0) ? -1 : (res ? 1 : 0);
*e1 = o1;
*e2 = o2;
}
/*
* Stop comparing segments when a difference has been found. Here we
* may have to flip the result to account for signs.
*/
if (res != 0) {
if (flip) {
res = -res;
}
break;
}
/*
* Go on to the next version number if the current numbers match.
* However stop processing if the end of both numbers has been
* reached.
*/
s1 = e1;
s2 = e2;
if (*s1 != 0) {
s1++;
} else if (*s2 == 0) {
/*
* s1, s2 both at the end => identical
*/
res = 0;
break;
}
if (*s2 != 0) {
s2++;
}
thisIsMajor = 0;
}
if (isMajorPtr != NULL) {
*isMajorPtr = thisIsMajor;
}
return res;
}
/*
*----------------------------------------------------------------------
*
* CheckAllRequirements --
*
* This function checks to see whether all requirements in a set have
* valid syntax.
*
* Results:
* TCL_OK is returned if all requirements are valid. Otherwise TCL_ERROR
* is returned and an error message is left in the interp's result.
*
* Side effects:
* May modify the interpreter result.
*
*----------------------------------------------------------------------
*/
static int
CheckAllRequirements(
Tcl_Interp *interp,
int reqc, /* Requirements to check. */
Tcl_Obj *const reqv[])
{
int i;
for (i = 0; i < reqc; i++) {
if ((CheckRequirement(interp, TclGetString(reqv[i])) != TCL_OK)) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* CheckRequirement --
*
* This function checks to see whether a requirement has valid syntax.
*
* Results:
* If string is a properly formed requirement then TCL_OK is returned.
* Otherwise TCL_ERROR is returned and an error message is left in the
* interp's result.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
CheckRequirement(
Tcl_Interp *interp, /* Used for error reporting. */
const char *string) /* Supposedly a requirement. */
{
/*
* Syntax of requirement = version
* = version-version
* = version-
*/
char *dash = NULL, *buf;
dash = strchr(string, '+') ? NULL : (char *)strchr(string, '-');
if (dash == NULL) {
/*
* '+' found or no dash found: has to be a simple version.
*/
return CheckVersionAndConvert(interp, string, NULL, NULL);
}
if (strchr(dash+1, '-') != NULL) {
/*
* More dashes found after the first. This is wrong.
*/
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"expected versionMin-versionMax but got \"%s\"", string));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "VERSIONRANGE", (char *)NULL);
return TCL_ERROR;
}
/*
* Exactly one dash is present. Copy the string, split at the location of
* dash and check that both parts are versions. Note that the max part can
* be empty. Also note that the string allocated with strdup() must be
* freed with free() and not Tcl_Free().
*/
DupString(buf, string);
dash = buf + (dash - string);
*dash = '\0'; /* buf now <=> min part */
dash++; /* dash now <=> max part */
if ((CheckVersionAndConvert(interp, buf, NULL, NULL) != TCL_OK) ||
((*dash != '\0') &&
(CheckVersionAndConvert(interp, dash, NULL, NULL) != TCL_OK))) {
Tcl_Free(buf);
return TCL_ERROR;
}
Tcl_Free(buf);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* AddRequirementsToResult --
*
* This function accumulates requirements in the interpreter result.
*
* Results:
* None.
*
* Side effects:
* The interpreter result is extended.
*
*----------------------------------------------------------------------
*/
static void
AddRequirementsToResult(
Tcl_Interp *interp,
int reqc, /* Requirements constraining the desired
* version. */
Tcl_Obj *const reqv[]) /* 0 means to use the latest version
* available. */
{
Tcl_Obj *result = Tcl_GetObjResult(interp);
int i;
Tcl_Size length;
for (i = 0; i < reqc; i++) {
const char *v = TclGetStringFromObj(reqv[i], &length);
if ((length & 0x1) && (v[length/2] == '-')
&& (strncmp(v, v+((length+1)/2), length/2) == 0)) {
Tcl_AppendPrintfToObj(result, " exactly %s", v+((length+1)/2));
} else {
Tcl_AppendPrintfToObj(result, " %s", v);
}
}
}
/*
*----------------------------------------------------------------------
*
* AddRequirementsToDString --
*
* This function accumulates requirements in a DString.
*
* Results:
* None.
*
* Side effects:
* The DString argument is extended.
*
*----------------------------------------------------------------------
*/
static void
AddRequirementsToDString(
Tcl_DString *dsPtr,
int reqc, /* Requirements constraining the desired
* version. */
Tcl_Obj *const reqv[]) /* 0 means to use the latest version
* available. */
{
int i;
if (reqc > 0) {
for (i = 0; i < reqc; i++) {
TclDStringAppendLiteral(dsPtr, " ");
TclDStringAppendObj(dsPtr, reqv[i]);
}
} else {
TclDStringAppendLiteral(dsPtr, " 0-");
}
}
/*
*----------------------------------------------------------------------
*
* SomeRequirementSatisfied --
*
* This function checks to see whether a version satisfies at least one
* of a set of requirements.
*
* Results:
* If the requirements are satisfied 1 is returned. Otherwise 0 is
* returned. The function assumes that all pieces have valid syntax. And
* is allowed to make that assumption.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
SomeRequirementSatisfied(
char *availVersionI, /* Candidate version to check against the
* requirements. */
int reqc, /* Requirements constraining the desired
* version. */
Tcl_Obj *const reqv[]) /* 0 means to use the latest version
* available. */
{
int i;
for (i = 0; i < reqc; i++) {
if (RequirementSatisfied(availVersionI, TclGetString(reqv[i]))) {
return 1;
}
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* RequirementSatisfied --
*
* This function checks to see whether a version satisfies a requirement.
*
* Results:
* If the requirement is satisfied 1 is returned. Otherwise 0 is
* returned. The function assumes that all pieces have valid syntax, and
* is allowed to make that assumption.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
RequirementSatisfied(
char *havei, /* Version string, of candidate package we
* have. */
const char *req) /* Requirement string the candidate has to
* satisfy. */
{
/*
* The have candidate is already in internal rep.
*/
int satisfied, res;
char *dash = NULL, *buf, *min, *max;
dash = (char *)strchr(req, '-');
if (dash == NULL) {
/*
* No dash found, is a simple version, fallback to regular check. The
* 'CheckVersionAndConvert' cannot fail. We pad the requirement with
* 'a0', i.e '-2' before doing the comparison to properly accept
* unstables as well.
*/
char *reqi = NULL;
int thisIsMajor;
CheckVersionAndConvert(NULL, req, &reqi, NULL);
strcat(reqi, " -2");
res = CompareVersions(havei, reqi, &thisIsMajor);
satisfied = (res == 0) || ((res == 1) && !thisIsMajor);
Tcl_Free(reqi);
return satisfied;
}
/*
* Exactly one dash is present (Assumption of valid syntax). Copy the req,
* split at the location of dash and check that both parts are versions.
* Note that the max part can be empty.
*/
DupString(buf, req);
dash = buf + (dash - req);
*dash = '\0'; /* buf now <=> min part */
dash++; /* dash now <=> max part */
if (*dash == '\0') {
/*
* We have a min, but no max. For the comparison we generate the
* internal rep, padded with 'a0' i.e. '-2'.
*/
CheckVersionAndConvert(NULL, buf, &min, NULL);
strcat(min, " -2");
satisfied = (CompareVersions(havei, min, NULL) >= 0);
Tcl_Free(min);
Tcl_Free(buf);
return satisfied;
}
/*
* We have both min and max, and generate their internal reps. When
* identical we compare as is, otherwise we pad with 'a0' to over the range
* a bit.
*/
CheckVersionAndConvert(NULL, buf, &min, NULL);
CheckVersionAndConvert(NULL, dash, &max, NULL);
if (CompareVersions(min, max, NULL) == 0) {
satisfied = (CompareVersions(min, havei, NULL) == 0);
} else {
strcat(min, " -2");
strcat(max, " -2");
satisfied = ((CompareVersions(min, havei, NULL) <= 0) &&
(CompareVersions(havei, max, NULL) < 0));
}
Tcl_Free(min);
Tcl_Free(max);
Tcl_Free(buf);
return satisfied;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PkgInitStubsCheck --
*
* This is a replacement routine for Tcl_InitStubs() that is called
* from code where -DUSE_TCL_STUBS has not been enabled.
*
* Results:
* Returns the version of a conforming stubs table, or NULL, if
* the table version doesn't satisfy the requested requirements,
* according to historical practice.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_PkgInitStubsCheck(
Tcl_Interp *interp,
const char * version,
int exact)
{
const char *actualVersion = Tcl_PkgPresentEx(interp, "Tcl", version, 0, NULL);
if ((exact&1) && actualVersion) {
const char *p = version;
int count = 0;
while (*p) {
count += !isdigit(UCHAR(*p++));
}
if (count == 1) {
if (0 != strncmp(version, actualVersion, strlen(version))) {
/* Construct error message */
Tcl_PkgPresentEx(interp, "Tcl", version, 1, NULL);
return NULL;
}
} else {
return Tcl_PkgPresentEx(interp, "Tcl", version, 1, NULL);
}
}
return actualVersion;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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