/* * tclPkg.c -- * * This file implements package and version control for Tcl via * the "package" command and a few C APIs. * * Copyright (c) 1996 Sun Microsystems, Inc. * Copyright (c) 2006 Andreas Kupries * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclPkg.c,v 1.1.1.2 2009/03/23 15:10:40 duncan Exp $ * * TIP #268. * Heavily rewritten to handle the extend version numbers, and extended * package requirements. */ #include "tclInt.h" /* * 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. */ struct PkgAvail *nextPtr; /* Next in list of available versions of * the same package. */ } PkgAvail; /* * 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 Package { char *version; /* Version that has been supplied in this * interpreter via "package provide" * (malloc'ed). NULL means the package doesn't * exist in this interpreter yet. */ PkgAvail *availPtr; /* First in list of all available versions * of this package. */ ClientData clientData; /* Client data. */ } Package; /* * Prototypes for procedures defined in this file: */ #ifndef TCL_TIP268 static int CheckVersion _ANSI_ARGS_((Tcl_Interp *interp, CONST char *string)); static int ComparePkgVersions _ANSI_ARGS_((CONST char *v1, CONST char *v2, int *satPtr)); static Package * FindPackage _ANSI_ARGS_((Tcl_Interp *interp, CONST char *name)); #else static int CheckVersionAndConvert(Tcl_Interp *interp, CONST char *string, char** internal, int* stable); static int CompareVersions(CONST char *v1i, CONST 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 const char * PkgRequireCore(Tcl_Interp *interp, CONST char *name, int reqx, Tcl_Obj *CONST reqv[], ClientData *clientDataPtr); #endif /* * Helper macros. */ #define DupBlock(v,s,len) \ ((v) = ckalloc(len), memcpy((v),(s),(len))) #define DupString(v,s) \ do { \ unsigned local__len = (unsigned) (strlen(s) + 1); \ DupBlock((v),(s),local__len); \ } while (0) /* *---------------------------------------------------------------------- * * Tcl_PkgProvide / Tcl_PkgProvideEx -- * * This procedure 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. * *---------------------------------------------------------------------- */ int Tcl_PkgProvide(interp, name, version) 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, (ClientData) NULL); } int Tcl_PkgProvideEx(interp, name, version, clientData) Tcl_Interp *interp; /* Interpreter in which package is now * available. */ CONST char *name; /* Name of package. */ CONST char *version; /* Version string for package. */ ClientData clientData; /* clientdata for this package (normally * used for C callback function table) */ { Package *pkgPtr; #ifdef TCL_TIP268 char* pvi; char* vi; int res; #endif pkgPtr = FindPackage(interp, name); if (pkgPtr->version == NULL) { DupString(pkgPtr->version, version); pkgPtr->clientData = clientData; return TCL_OK; } #ifndef TCL_TIP268 if (ComparePkgVersions(pkgPtr->version, version, (int *) NULL) == 0) { #else if (CheckVersionAndConvert (interp, pkgPtr->version, &pvi, NULL) != TCL_OK) { return TCL_ERROR; } else if (CheckVersionAndConvert (interp, version, &vi, NULL) != TCL_OK) { ckfree(pvi); return TCL_ERROR; } res = CompareVersions(pvi, vi, NULL); ckfree(pvi); ckfree(vi); if (res == 0) { #endif if (clientData != NULL) { pkgPtr->clientData = clientData; } return TCL_OK; } Tcl_AppendResult(interp, "conflicting versions provided for package \"", name, "\": ", pkgPtr->version, ", then ", version, (char *) NULL); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * Tcl_PkgRequire / Tcl_PkgRequireEx / Tcl_PkgRequireProc -- * * This procedure 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 procedure invokes a Tcl script * to provide it. If the package is already provided, this * procedure 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. * *---------------------------------------------------------------------- */ #ifndef TCL_TIP268 /* * Empty definition for Stubs when TIP 268 is not activated. */ int Tcl_PkgRequireProc(interp,name,reqc,reqv,clientDataPtr) Tcl_Interp *interp; /* Interpreter in which package is now * available. */ CONST char *name; /* Name of desired package. */ int reqc; /* Requirements constraining the desired version. */ Tcl_Obj *CONST reqv[]; /* 0 means to use the latest version available. */ ClientData *clientDataPtr; { return TCL_ERROR; } #endif CONST char * Tcl_PkgRequire(interp, name, version, exact) 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, (ClientData *) NULL); } CONST char * Tcl_PkgRequireEx(interp, name, version, exact, clientDataPtr) 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. */ ClientData *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. */ { #ifndef TCL_TIP268 Package *pkgPtr; PkgAvail *availPtr, *bestPtr; char *script; int code, satisfies, result, pass; Tcl_DString command; #else Tcl_Obj *ov; const char *result = NULL; #endif /* * 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 * the file generic/tclObj.c. 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. In particular, it * doesn't have a proper value for tclEmptyStringRep. The * Tcl_Obj system heavily depends on the value of tclEmptyStringRep * and all of Tcl depends (increasingly) on the Tcl_Obj system, we * need to correct that flaw before making the calls to set the * interpreter result to the error message. That's the only flaw * corrected; other problems with initialization of the Tcl library * are not remedied, so be very careful about adding any other calls * here without checking how they behave when initialization is * incomplete. */ tclEmptyStringRep = &tclEmptyString; Tcl_AppendResult(interp, "Cannot load package \"", name, "\" in standalone executable: This package is not ", "compiled with stub support", NULL); return NULL; } #ifdef TCL_TIP268 /* Translate between old and new API, and defer to the new function. */ if (version == NULL) { result = PkgRequireCore(interp, name, 0, NULL, clientDataPtr); } else { if (exact && TCL_OK != CheckVersionAndConvert(interp, version, NULL, NULL)) { return NULL; } ov = Tcl_NewStringObj(version, -1); if (exact) { Tcl_AppendStringsToObj(ov, "-", version, NULL); } Tcl_IncrRefCount (ov); result = PkgRequireCore(interp, name, 1, &ov, clientDataPtr); Tcl_DecrRefCount (ov); } return result; } int Tcl_PkgRequireProc( Tcl_Interp *interp, /* Interpreter in which package is now * available. */ CONST char *name, /* Name of desired package. */ int reqc, /* Requirements constraining the desired * version. */ Tcl_Obj *CONST reqv[], /* 0 means to use the latest version * available. */ ClientData *clientDataPtr) { const char *result = PkgRequireCore(interp, name, reqc, reqv, clientDataPtr); if (result == NULL) { return TCL_ERROR; } Tcl_SetObjResult(interp, Tcl_NewStringObj(result, -1)); return TCL_OK; } static const char * PkgRequireCore( Tcl_Interp *interp, /* Interpreter in which package is now * available. */ CONST char *name, /* Name of desired package. */ int reqc, /* Requirements constraining the desired * version. */ Tcl_Obj *CONST reqv[], /* 0 means to use the latest version * available. */ ClientData *clientDataPtr) { Interp *iPtr = (Interp *) interp; Package *pkgPtr; PkgAvail *availPtr, *bestPtr, *bestStablePtr; char *availVersion, *bestVersion; /* Internal rep. of versions */ int availStable; char *script; int code, satisfies, pass; Tcl_DString command; char* pkgVersionI; #endif /* * It can take up to three passes to find the package: one pass to run the * "package unknown" script, one to run the "package ifneeded" script for * a specific version, and a final pass to lookup the package loaded by * the "package ifneeded" script. */ for (pass = 1; ; pass++) { pkgPtr = FindPackage(interp, name); if (pkgPtr->version != NULL) { break; } /* * Check whether we're already attempting to load some version * of this package (circular dependency detection). */ if (pkgPtr->clientData != NULL) { Tcl_AppendResult(interp, "circular package dependency: ", "attempt to provide ", name, " ", (char *)(pkgPtr->clientData), " requires ", name, NULL); #ifndef TCL_TIP268 if (version != NULL) { Tcl_AppendResult(interp, " ", version, NULL); } #else AddRequirementsToResult (interp, reqc, reqv); #endif return NULL; } /* * The package isn't yet present. Search the list of available * versions and invoke the script for the best available version. * * For TIP 268 we are actually locating the best, and the best stable * version. One of them is then chosen based on the selection mode. */ #ifndef TCL_TIP268 bestPtr = NULL; for (availPtr = pkgPtr->availPtr; availPtr != NULL; availPtr = availPtr->nextPtr) { if ((bestPtr != NULL) && (ComparePkgVersions(availPtr->version, bestPtr->version, (int *) NULL) <= 0)) { #else bestPtr = NULL; bestStablePtr = NULL; bestVersion = 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. */ #endif continue; } #ifndef TCL_TIP268 if (version != NULL) { result = ComparePkgVersions(availPtr->version, version, &satisfies); if ((result != 0) && exact) { #else if (bestPtr != NULL) { int res = CompareVersions (availVersion, bestVersion, NULL); /* Note: Use internal reps! */ if (res <= 0) { /* * The version of the package sought is not as good as the * currently selected version. Ignore it. */ ckfree(availVersion); availVersion = NULL; #endif continue; } #ifdef TCL_TIP268 } /* We have found a version which is better than our max. */ if (reqc > 0) { /* Check satisfaction of requirements. */ satisfies = SomeRequirementSatisfied(availVersion, reqc, reqv); #endif if (!satisfies) { #ifdef TCL_TIP268 ckfree(availVersion); availVersion = NULL; #endif continue; } } bestPtr = availPtr; #ifdef TCL_TIP268 if (bestVersion != NULL) { ckfree(bestVersion); } bestVersion = availVersion; availVersion = NULL; /* * If this new best version is stable then it also has to be * better than the max stable version found so far. */ if (availStable) { bestStablePtr = availPtr; } } if (bestVersion != NULL) { ckfree(bestVersion); } /* 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; #endif } if (bestPtr != NULL) { /* * 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. */ CONST char *versionToProvide = bestPtr->version; script = bestPtr->script; pkgPtr->clientData = (ClientData) versionToProvide; Tcl_Preserve((ClientData) script); Tcl_Preserve((ClientData) versionToProvide); code = Tcl_EvalEx(interp, script, -1, TCL_EVAL_GLOBAL); Tcl_Release((ClientData) script); pkgPtr = FindPackage(interp, name); if (code == TCL_OK) { #ifdef TCL_TIP268 Tcl_ResetResult(interp); #endif if (pkgPtr->version == NULL) { #ifndef TCL_TIP268 Tcl_ResetResult(interp); #endif code = TCL_ERROR; Tcl_AppendResult(interp, "attempt to provide package ", name, " ", versionToProvide, " failed: no version of package ", name, " provided", NULL); #ifndef TCL_TIP268 } else if (0 != ComparePkgVersions( pkgPtr->version, versionToProvide, NULL)) { /* At this point, it is clear that a prior * [package ifneeded] command lied to us. It said * that to get a particular version of a particular * package, we needed to evaluate a particular script. * However, we evaluated that script and got a different * version than we were told. This is an error, and we * ought to report it. * * However, we've been letting this type of error slide * for a long time, and as a result, a lot of packages * suffer from them. * * It's a bit too harsh to make a large number of * existing packages start failing by releasing a * new patch release, so we forgive this type of error * for the rest of the Tcl 8.4 series. * * We considered reporting a warning, but in practice * even that appears too harsh a change for a patch release. * * We limit the error reporting to only * the situation where a broken ifneeded script leads * to a failure to satisfy the requirement. */ if (version) { result = ComparePkgVersions( pkgPtr->version, version, &satisfies); if (result && (exact || !satisfies)) { Tcl_ResetResult(interp); code = TCL_ERROR; Tcl_AppendResult(interp, "attempt to provide package ", name, " ", versionToProvide, " failed: package ", name, " ", pkgPtr->version, " provided instead", NULL); #else } else { char *pvi, *vi; int res; if (CheckVersionAndConvert(interp, pkgPtr->version, &pvi, NULL) != TCL_OK) { code = TCL_ERROR; } else if (CheckVersionAndConvert(interp, versionToProvide, &vi, NULL) != TCL_OK) { ckfree(pvi); code = TCL_ERROR; } else { res = CompareVersions(pvi, vi, NULL); ckfree(vi); if (res != 0) { /* At this point, it is clear that a prior * [package ifneeded] command lied to us. It said * that to get a particular version of a particular * package, we needed to evaluate a particular * script. However, we evaluated that script and * got a different version than we were told. * This is an error, and we ought to report it. * * However, we've been letting this type of error * slide for a long time, and as a result, a lot * of packages suffer from them. * * It's a bit too harsh to make a large number of * existing packages start failing by releasing a * new patch release, so we forgive this type of * error for the rest of the Tcl 8.4 series. * * We considered reporting a warning, but in * practice even that appears too harsh a change * for a patch release. * * We limit the error reporting to only the * situation where a broken ifneeded script leads * to a failure to satisfy the requirement. */ if (reqc > 0) { satisfies = SomeRequirementSatisfied(pvi, reqc, reqv); if (!satisfies) { code = TCL_ERROR; Tcl_AppendResult(interp, "attempt to provide package ", name, " ", versionToProvide, " failed: package ", name, " ", pkgPtr->version, " provided instead", NULL); } } #endif } #ifdef TCL_TIP268 ckfree(pvi); #endif } } } else if (code != TCL_ERROR) { Tcl_Obj *codePtr = Tcl_NewIntObj(code); Tcl_ResetResult(interp); Tcl_AppendResult(interp, "attempt to provide package ", name, " ", versionToProvide, " failed: ", "bad return code: ", Tcl_GetString(codePtr), NULL); Tcl_DecrRefCount(codePtr); code = TCL_ERROR; } Tcl_Release((ClientData) versionToProvide); if (code != 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. */ Tcl_AddErrorInfo(interp, "\n (\"package ifneeded\" script)"); if (pkgPtr->version != NULL) { ckfree(pkgPtr->version); pkgPtr->version = NULL; } pkgPtr->clientData = NULL; return NULL; } break; } /* * The package is not in the database. If there is a "package unknown" * command, invoke it (but only on the first pass; after that, we * should not get here in the first place). */ if (pass > 1) { break; } script = ((Interp *) interp)->packageUnknown; if (script != NULL) { Tcl_DStringInit(&command); Tcl_DStringAppend(&command, script, -1); Tcl_DStringAppendElement(&command, name); #ifndef TCL_TIP268 Tcl_DStringAppend(&command, " ", 1); Tcl_DStringAppend(&command, (version != NULL) ? version : "{}", -1); if (exact) { Tcl_DStringAppend(&command, " -exact", 7); } #else AddRequirementsToDString(&command, reqc, reqv); #endif code = Tcl_EvalEx(interp, Tcl_DStringValue(&command), Tcl_DStringLength(&command), TCL_EVAL_GLOBAL); Tcl_DStringFree(&command); if ((code != TCL_OK) && (code != TCL_ERROR)) { Tcl_Obj *codePtr = Tcl_NewIntObj(code); Tcl_ResetResult(interp); Tcl_AppendResult(interp, "bad return code: ", Tcl_GetString(codePtr), NULL); Tcl_DecrRefCount(codePtr); code = TCL_ERROR; } if (code == TCL_ERROR) { Tcl_AddErrorInfo(interp, "\n (\"package unknown\" script)"); return NULL; } Tcl_ResetResult(interp); } } if (pkgPtr->version == NULL) { Tcl_AppendResult(interp, "can't find package ", name, (char *) NULL); #ifndef TCL_TIP268 if (version != NULL) { Tcl_AppendResult(interp, " ", version, (char *) NULL); } #else AddRequirementsToResult(interp, reqc, reqv); #endif return NULL; } /* * At this point we know that the package is present. Make sure that the * provided version meets the current requirements. */ #ifndef TCL_TIP268 if (version == NULL) { if (clientDataPtr) { *clientDataPtr = pkgPtr->clientData; } return pkgPtr->version; #else if (reqc == 0) { satisfies = 1; } else { CheckVersionAndConvert(interp, pkgPtr->version, &pkgVersionI, NULL); satisfies = SomeRequirementSatisfied(pkgVersionI, reqc, reqv); ckfree(pkgVersionI); #endif } #ifndef TCL_TIP268 result = ComparePkgVersions(pkgPtr->version, version, &satisfies); if ((satisfies && !exact) || (result == 0)) { #else if (satisfies) { #endif if (clientDataPtr) { *clientDataPtr = pkgPtr->clientData; } return pkgPtr->version; } Tcl_AppendResult(interp, "version conflict for package \"", name, "\": have ", pkgPtr->version, #ifndef TCL_TIP268 ", need ", version, (char *) NULL); #else ", need", (char*) NULL); AddRequirementsToResult (interp, reqc, reqv); #endif return NULL; } /* *---------------------------------------------------------------------- * * 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. * *---------------------------------------------------------------------- */ CONST char * Tcl_PkgPresent(interp, name, version, exact) 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, (ClientData *) NULL); } CONST char * Tcl_PkgPresentEx(interp, name, version, exact, clientDataPtr) 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. */ ClientData *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. */ return Tcl_PkgRequireEx(interp, name, version, exact, clientDataPtr); } } if (version != NULL) { Tcl_AppendResult(interp, "package ", name, " ", version, " is not present", NULL); } else { Tcl_AppendResult(interp, "package ", name, " is not present", NULL); } return NULL; } /* *---------------------------------------------------------------------- * * Tcl_PackageObjCmd -- * * This procedure 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. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_PackageObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { static CONST char *pkgOptions[] = { "forget", "ifneeded", "names", #ifdef TCL_TIP268 "prefer", #endif "present", "provide", "require", "unknown", "vcompare", "versions", "vsatisfies", (char *) NULL }; enum pkgOptions { PKG_FORGET, PKG_IFNEEDED, PKG_NAMES, #ifdef TCL_TIP268 PKG_PREFER, #endif PKG_PRESENT, PKG_PROVIDE, PKG_REQUIRE, PKG_UNKNOWN, PKG_VCOMPARE, PKG_VERSIONS, PKG_VSATISFIES }; Interp *iPtr = (Interp *) interp; int optionIndex, exact, i, satisfies; PkgAvail *availPtr, *prevPtr; Package *pkgPtr; Tcl_HashEntry *hPtr; Tcl_HashSearch search; Tcl_HashTable *tablePtr; CONST char *version; char *argv2, *argv3, *argv4; #ifdef TCL_TIP268 char* iva = NULL; char* ivb = NULL; #endif if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], pkgOptions, "option", 0, &optionIndex) != TCL_OK) { return TCL_ERROR; } switch ((enum pkgOptions) optionIndex) { case PKG_FORGET: { char *keyString; for (i = 2; i < objc; i++) { keyString = Tcl_GetString(objv[i]); hPtr = Tcl_FindHashEntry(&iPtr->packageTable, keyString); if (hPtr == NULL) { continue; } pkgPtr = (Package *) Tcl_GetHashValue(hPtr); Tcl_DeleteHashEntry(hPtr); if (pkgPtr->version != NULL) { ckfree(pkgPtr->version); } while (pkgPtr->availPtr != NULL) { availPtr = pkgPtr->availPtr; pkgPtr->availPtr = availPtr->nextPtr; Tcl_EventuallyFree((ClientData)availPtr->version, TCL_DYNAMIC); Tcl_EventuallyFree((ClientData)availPtr->script, TCL_DYNAMIC); ckfree((char *) availPtr); } ckfree((char *) pkgPtr); } break; } case PKG_IFNEEDED: { int length; #ifdef TCL_TIP268 int res; char *argv3i, *avi; #endif if ((objc != 4) && (objc != 5)) { Tcl_WrongNumArgs(interp, 2, objv, "package version ?script?"); return TCL_ERROR; } argv3 = Tcl_GetString(objv[3]); #ifdef TCL_TIP268 if (CheckVersionAndConvert(interp, argv3, &argv3i, NULL) != TCL_OK) { #else if (CheckVersion(interp, argv3) != TCL_OK) { #endif return TCL_ERROR; } argv2 = Tcl_GetString(objv[2]); if (objc == 4) { hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv2); if (hPtr == NULL) { #ifdef TCL_TIP268 ckfree(argv3i); #endif return TCL_OK; } pkgPtr = (Package *) Tcl_GetHashValue(hPtr); } else { pkgPtr = FindPackage(interp, argv2); } argv3 = Tcl_GetStringFromObj(objv[3], &length); for (availPtr = pkgPtr->availPtr, prevPtr = NULL; availPtr != NULL; prevPtr = availPtr, availPtr = availPtr->nextPtr) { #ifdef TCL_TIP268 if (CheckVersionAndConvert(interp, availPtr->version, &avi, NULL) != TCL_OK) { ckfree(argv3i); return TCL_ERROR; } res = CompareVersions(avi, argv3i, NULL); ckfree(avi); if (res == 0){ #else if (ComparePkgVersions(availPtr->version, argv3, (int *) NULL) == 0) { #endif if (objc == 4) { #ifdef TCL_TIP268 ckfree(argv3i); #endif Tcl_SetResult(interp, availPtr->script, TCL_VOLATILE); return TCL_OK; } Tcl_EventuallyFree((ClientData)availPtr->script, TCL_DYNAMIC); break; } } #ifdef TCL_TIP268 ckfree(argv3i); #endif if (objc == 4) { return TCL_OK; } if (availPtr == NULL) { availPtr = (PkgAvail *) ckalloc(sizeof(PkgAvail)); DupBlock(availPtr->version, argv3, (unsigned) length + 1); if (prevPtr == NULL) { availPtr->nextPtr = pkgPtr->availPtr; pkgPtr->availPtr = availPtr; } else { availPtr->nextPtr = prevPtr->nextPtr; prevPtr->nextPtr = availPtr; } } argv4 = Tcl_GetStringFromObj(objv[4], &length); DupBlock(availPtr->script, argv4, (unsigned) length + 1); break; } case PKG_NAMES: { if (objc != 2) { Tcl_WrongNumArgs(interp, 2, objv, NULL); return TCL_ERROR; } 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_AppendElement(interp, Tcl_GetHashKey(tablePtr, hPtr)); } } break; } case PKG_PRESENT: { const char *name; if (objc < 3) { goto require; } argv2 = Tcl_GetString(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 = Tcl_GetHashValue(hPtr); if (pkgPtr->version != NULL) { goto require; } } #ifndef TCL_TIP268 version = NULL; if (objc == (4 + exact)) { version = Tcl_GetString(objv[3 + exact]); if (CheckVersion(interp, version) != TCL_OK) { return TCL_ERROR; } } else if ((objc != 3) || exact) { goto requireSyntax; } #else version = NULL; if (exact) { version = Tcl_GetString(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]); } } #endif Tcl_PkgPresent(interp, name, version, exact); return TCL_ERROR; break; } case PKG_PROVIDE: { if ((objc != 3) && (objc != 4)) { Tcl_WrongNumArgs(interp, 2, objv, "package ?version?"); return TCL_ERROR; } argv2 = Tcl_GetString(objv[2]); if (objc == 3) { hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv2); if (hPtr != NULL) { pkgPtr = (Package *) Tcl_GetHashValue(hPtr); if (pkgPtr->version != NULL) { Tcl_SetResult(interp, pkgPtr->version, TCL_VOLATILE); } } return TCL_OK; } argv3 = Tcl_GetString(objv[3]); #ifndef TCL_TIP268 if (CheckVersion(interp, argv3) != TCL_OK) { #else if (CheckVersionAndConvert(interp, argv3, NULL, NULL) != TCL_OK) { #endif return TCL_ERROR; } return Tcl_PkgProvide(interp, argv2, argv3); } case PKG_REQUIRE: { require: if (objc < 3) { requireSyntax: #ifndef TCL_TIP268 Tcl_WrongNumArgs(interp, 2, objv, "?-exact? package ?version?"); #else Tcl_WrongNumArgs(interp, 2, objv, "?-exact? package ?requirement...?"); #endif return TCL_ERROR; } #ifndef TCL_TIP268 argv2 = Tcl_GetString(objv[2]); if ((argv2[0] == '-') && (strcmp(argv2, "-exact") == 0)) { exact = 1; } else { exact = 0; } version = NULL; if (objc == (4 + exact)) { version = Tcl_GetString(objv[3 + exact]); if (CheckVersion(interp, version) != TCL_OK) { return TCL_ERROR; } } else if ((objc != 3) || exact) { goto requireSyntax; } if (exact) { argv3 = Tcl_GetString(objv[3]); version = Tcl_PkgRequire(interp, argv3, version, exact); } else { version = Tcl_PkgRequire(interp, argv2, version, exact); } if (version == NULL) { return TCL_ERROR; } Tcl_SetObjResult( interp, Tcl_NewStringObj( version, -1 ) ); #else version = NULL; argv2 = Tcl_GetString(objv[2]); if ((argv2[0] == '-') && (strcmp(argv2, "-exact") == 0)) { Tcl_Obj* ov; int res; if (objc != 5) { goto requireSyntax; } version = Tcl_GetString(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, NULL); version = NULL; argv3 = Tcl_GetString(objv[3]); Tcl_IncrRefCount (ov); res = Tcl_PkgRequireProc(interp, argv3, 1, &ov, NULL); Tcl_DecrRefCount (ov); return res; } else { if (CheckAllRequirements (interp, objc-3, objv+3) != TCL_OK) { return TCL_ERROR; } return Tcl_PkgRequireProc(interp, argv2, objc-3, objv+3, NULL); } #endif break; } case PKG_UNKNOWN: { int length; if (objc == 2) { if (iPtr->packageUnknown != NULL) { Tcl_SetResult(interp, iPtr->packageUnknown, TCL_VOLATILE); } } else if (objc == 3) { if (iPtr->packageUnknown != NULL) { ckfree(iPtr->packageUnknown); } argv2 = Tcl_GetStringFromObj(objv[2], &length); if (argv2[0] == 0) { iPtr->packageUnknown = NULL; } else { DupBlock(iPtr->packageUnknown, argv2, (unsigned) length + 1); } } else { Tcl_WrongNumArgs(interp, 2, objv, "?command?"); return TCL_ERROR; } break; } #ifdef TCL_TIP268 case PKG_PREFER: { /* See tclInt.h for the enum, just before Interp */ static CONST char *pkgPreferOptions[] = { "latest", "stable", NULL }; if (objc > 3) { Tcl_WrongNumArgs(interp, 2, objv, "?latest|stable?"); return TCL_ERROR; } else if (objc == 3) { /* Set value. */ int new; if (Tcl_GetIndexFromObj(interp, objv[2], pkgPreferOptions, "preference", 0, &new) != TCL_OK) { return TCL_ERROR; } if (new < iPtr->packagePrefer) { iPtr->packagePrefer = new; } } /* Always return current value. */ Tcl_SetObjResult(interp, Tcl_NewStringObj(pkgPreferOptions[iPtr->packagePrefer], -1)); break; } #endif case PKG_VCOMPARE: { if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "version1 version2"); return TCL_ERROR; } argv3 = Tcl_GetString(objv[3]); argv2 = Tcl_GetString(objv[2]); #ifndef TCL_TIP268 if ((CheckVersion(interp, argv2) != TCL_OK) || (CheckVersion(interp, argv3) != TCL_OK)) { return TCL_ERROR; } Tcl_SetObjResult(interp, Tcl_NewIntObj( ComparePkgVersions(argv2, argv3, (int *) NULL))); #else if ((CheckVersionAndConvert (interp, argv2, &iva, NULL) != TCL_OK) || (CheckVersionAndConvert (interp, argv3, &ivb, NULL) != TCL_OK)) { if (iva != NULL) { ckfree(iva); } /* ivb cannot be set in this branch */ return TCL_ERROR; } /* Comparison is done on the internal representation */ Tcl_SetObjResult(interp, Tcl_NewIntObj(CompareVersions(iva, ivb, NULL))); ckfree(iva); ckfree(ivb); #endif break; } case PKG_VERSIONS: { if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "package"); return TCL_ERROR; } argv2 = Tcl_GetString(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_AppendElement(interp, availPtr->version); } } break; } case PKG_VSATISFIES: { #ifdef TCL_TIP268 char* argv2i = NULL; if (objc < 4) { Tcl_WrongNumArgs(interp, 2, objv, "version requirement requirement..."); return TCL_ERROR; } argv2 = Tcl_GetString(objv[2]); if ((CheckVersionAndConvert(interp, argv2, &argv2i, NULL) != TCL_OK)) { return TCL_ERROR; } else if (CheckAllRequirements(interp, objc-3, objv+3) != TCL_OK) { ckfree(argv2i); return TCL_ERROR; } satisfies = SomeRequirementSatisfied(argv2i, objc-3, objv+3); ckfree (argv2i); #else if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "version1 version2"); return TCL_ERROR; } argv3 = Tcl_GetString(objv[3]); argv2 = Tcl_GetString(objv[2]); if ((CheckVersion(interp, argv2) != TCL_OK) || (CheckVersion(interp, argv3) != TCL_OK)) { return TCL_ERROR; } ComparePkgVersions(argv2, argv3, &satisfies); #endif Tcl_SetObjResult(interp, Tcl_NewIntObj(satisfies)); break; } default: { panic("Tcl_PackageObjCmd: bad option index to pkgOptions"); } } return TCL_OK; } /* *---------------------------------------------------------------------- * * FindPackage -- * * This procedure 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(interp, name) 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 new; Package *pkgPtr; hPtr = Tcl_CreateHashEntry(&iPtr->packageTable, name, &new); if (new) { pkgPtr = (Package *) ckalloc(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 procedure 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(iPtr) 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) { ckfree(pkgPtr->version); } while (pkgPtr->availPtr != NULL) { availPtr = pkgPtr->availPtr; pkgPtr->availPtr = availPtr->nextPtr; Tcl_EventuallyFree((ClientData)availPtr->version, TCL_DYNAMIC); Tcl_EventuallyFree((ClientData)availPtr->script, TCL_DYNAMIC); ckfree((char *) availPtr); } ckfree((char *) pkgPtr); } Tcl_DeleteHashTable(&iPtr->packageTable); if (iPtr->packageUnknown != NULL) { ckfree(iPtr->packageUnknown); } } /* *---------------------------------------------------------------------- * * CheckVersion / CheckVersionAndConvert -- * * This procedure checks to see whether a version number has * valid syntax. * * 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. * *---------------------------------------------------------------------- */ #ifndef TCL_TIP268 static int CheckVersion(interp, string) Tcl_Interp *interp; /* Used for error reporting. */ CONST char *string; /* Supposedly a version number, which is * groups of decimal digits separated * by dots. */ { CONST char *p = string; char prevChar; if (!isdigit(UCHAR(*p))) { /* INTL: digit */ goto error; } for (prevChar = *p, p++; *p != 0; p++) { if (!isdigit(UCHAR(*p)) && ((*p != '.') || (prevChar == '.'))) { /* INTL: digit */ goto error; } prevChar = *p; } if (prevChar != '.') { return TCL_OK; } error: Tcl_AppendResult(interp, "expected version number but got \"", string, "\"", (char *) NULL); return TCL_ERROR; } #else static int CheckVersionAndConvert(interp, string, internal, stable) 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 spce for an additional -2 at the end */ char* ibuf = ckalloc(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++) { if ((!isdigit(UCHAR(*p))) && (((*p != '.') && (*p != 'a') && (*p != 'b')) || ((hasunstable && ((*p == 'a') || (*p == 'b'))) || (((prevChar == 'a') || (prevChar == 'b') || (prevChar == '.')) && (*p == '.')) || (((*p == 'a') || (*p == 'b') || (*p == '.')) && (prevChar == '.'))))) { /* INTL: digit */ 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 { ckfree(ibuf); } if (stable != NULL) { *stable = !hasunstable; } return TCL_OK; } error: ckfree(ibuf); Tcl_AppendResult(interp, "expected version number but got \"", string, "\"", (char *) NULL); return TCL_ERROR; } #endif /* *---------------------------------------------------------------------- * * ComparePkgVersions / CompareVersions -- * * This procedure compares two version numbers. (268: 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. * *---------------------------------------------------------------------- */ #ifndef TCL_TIP268 static int ComparePkgVersions(v1, v2, satPtr) CONST char *v1; CONST char *v2; /* Versions strings, of form 2.1.3 (any * number of version numbers). */ int *satPtr; /* If non-null, the word pointed to is * filled in with a 0/1 value. 1 means * v1 "satisfies" v2: v1 is greater than * or equal to v2 and both version numbers * have the same major number. */ { int thisIsMajor, n1, n2; /* * 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. */ thisIsMajor = 1; while (1) { /* Parse one decimal number from the front of each string. */ n1 = n2 = 0; while ((*v1 != 0) && (*v1 != '.')) { n1 = 10*n1 + (*v1 - '0'); v1++; } while ((*v2 != 0) && (*v2 != '.')) { n2 = 10*n2 + (*v2 - '0'); v2++; } /* * Compare and go on to the next version number if the current numbers * match. */ if (n1 != n2) { break; } if (*v1 != 0) { v1++; } else if (*v2 == 0) { break; } if (*v2 != 0) { v2++; } thisIsMajor = 0; } if (satPtr != NULL) { *satPtr = (n1 == n2) || ((n1 > n2) && !thisIsMajor); } if (n1 > n2) { return 1; } else if (n1 == n2) { return 0; } else { return -1; } } #else static int CompareVersions(v1, v2, isMajorPtr) CONST char *v1; /* Versions strings, of form 2.1.3 (any number */ CONST char *v2; /* 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 * occured in the first element. */ { int thisIsMajor, n1, n2; int res, flip; /* * 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. */ thisIsMajor = 1; while (1) { /* Parse one decimal number from the front of each string. */ n1 = n2 = 0; flip = 0; while ((*v1 != 0) && (*v1 != ' ')) { if (*v1 == '-') {flip = 1 ; v1++ ; continue;} n1 = 10*n1 + (*v1 - '0'); v1++; } if (flip) n1 = -n1; flip = 0; while ((*v2 != 0) && (*v2 != ' ')) { if (*v2 == '-') {flip = 1; v2++ ; continue;} n2 = 10*n2 + (*v2 - '0'); v2++; } if (flip) n2 = -n2; /* * Compare and go on to the next version number if the current numbers * match. */ if (n1 != n2) { break; } if (*v1 != 0) { v1++; } else if (*v2 == 0) { break; } if (*v2 != 0) { v2++; } thisIsMajor = 0; } if (n1 > n2) { res = 1; } else if (n1 == n2) { res = 0; } else { res = -1; } 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(interp, reqc, reqv) Tcl_Interp* interp; int reqc; /* Requirements to check. */ Tcl_Obj *CONST reqv[]; { int i; for (i = 0; i < reqc; i++) { if ((CheckRequirement(interp, Tcl_GetString(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(interp, string) Tcl_Interp *interp; /* Used for error reporting. */ CONST char *string; /* Supposedly a requirement. */ { /* Syntax of requirement = version * = version-version * = version- */ char* dash = NULL; char* buf; dash = strchr (string, '-'); if (dash == NULL) { /* 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_AppendResult(interp, "expected versionMin-versionMax but got \"", string, "\"", 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. */ 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))) { ckfree(buf); return TCL_ERROR; } ckfree(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(interp, reqc, reqv) Tcl_Interp* interp; int reqc; /* Requirements constraining the desired version. */ Tcl_Obj *CONST reqv[]; /* 0 means use the latest version available. */ { if (reqc > 0) { int i; for (i = 0; i < reqc; i++) { int length; char *v = Tcl_GetStringFromObj(reqv[i], &length); if ((length & 0x1) && (v[length/2] == '-') && (strncmp(v, v+((length+1)/2), length/2) == 0)) { Tcl_AppendResult(interp, " ", v+((length+1)/2), NULL); } else { Tcl_AppendResult(interp, " ", v, NULL); } } } } /* *---------------------------------------------------------------------- * * AddRequirementsToDString -- * * This function accumulates requirements in a DString. * * Results: * None. * * Side effects: * The DString argument is extended. * *---------------------------------------------------------------------- */ static void AddRequirementsToDString(dstring, reqc, reqv) Tcl_DString* dstring; int reqc; /* Requirements constraining the desired version. */ Tcl_Obj *CONST reqv[]; /* 0 means use the latest version available. */ { if (reqc > 0) { int i; for (i = 0; i < reqc; i++) { Tcl_DStringAppend(dstring, " ", 1); Tcl_DStringAppend(dstring, TclGetString(reqv[i]), -1); } } else { Tcl_DStringAppend(dstring, " 0-", -1); } } /* *---------------------------------------------------------------------- * * 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(availVersionI, reqc, reqv) char *availVersionI; /* Candidate version to check against the * requirements. */ int reqc; /* Requirements constraining the desired * version. */ Tcl_Obj *CONST reqv[]; /* 0 means use the latest version available. */ { int i; for (i = 0; i < reqc; i++) { if (RequirementSatisfied(availVersionI, Tcl_GetString(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(havei, req) 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; char* buf, *min, *max; dash = 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); ckfree(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'. */ /* No max part, unbound */ CheckVersionAndConvert (NULL, buf, &min, NULL); strcat (min, " -2"); satisfied = (CompareVersions(havei, min, NULL) >= 0); ckfree(min); ckfree(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 ove 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)); } ckfree(min); ckfree(max); ckfree(buf); return satisfied; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */ #endif