735 lines
21 KiB
C
735 lines
21 KiB
C
/*
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* tclPkg.c --
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*
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* This file implements package and version control for Tcl via
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* the "package" command and a few C APIs.
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*
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* Copyright (c) 1996 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclPkg.c 1.9 97/05/14 13:23:51
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*/
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#include "tclInt.h"
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/*
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* Each invocation of the "package ifneeded" command creates a structure
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* of the following type, which is used to load the package into the
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* interpreter if it is requested with a "package require" command.
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*/
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typedef struct PkgAvail {
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char *version; /* Version string; malloc'ed. */
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char *script; /* Script to invoke to provide this version
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* of the package. Malloc'ed and protected
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* by Tcl_Preserve and Tcl_Release. */
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struct PkgAvail *nextPtr; /* Next in list of available versions of
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* the same package. */
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} PkgAvail;
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/*
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* For each package that is known in any way to an interpreter, there
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* is one record of the following type. These records are stored in
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* the "packageTable" hash table in the interpreter, keyed by
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* package name such as "Tk" (no version number).
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*/
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typedef struct Package {
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char *version; /* Version that has been supplied in this
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* interpreter via "package provide"
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* (malloc'ed). NULL means the package doesn't
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* exist in this interpreter yet. */
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PkgAvail *availPtr; /* First in list of all available versions
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* of this package. */
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} Package;
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/*
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* Prototypes for procedures defined in this file:
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*/
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static int CheckVersion _ANSI_ARGS_((Tcl_Interp *interp,
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char *string));
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static int ComparePkgVersions _ANSI_ARGS_((char *v1, char *v2,
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int *satPtr));
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static Package * FindPackage _ANSI_ARGS_((Tcl_Interp *interp,
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char *name));
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_PkgProvide --
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*
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* This procedure is invoked to declare that a particular version
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* of a particular package is now present in an interpreter. There
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* must not be any other version of this package already
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* provided in the interpreter.
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*
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* Results:
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* Normally returns TCL_OK; if there is already another version
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* of the package loaded then TCL_ERROR is returned and an error
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* message is left in interp->result.
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*
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* Side effects:
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* The interpreter remembers that this package is available,
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* so that no other version of the package may be provided for
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* the interpreter.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_PkgProvide(interp, name, version)
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Tcl_Interp *interp; /* Interpreter in which package is now
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* available. */
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char *name; /* Name of package. */
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char *version; /* Version string for package. */
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{
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Package *pkgPtr;
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pkgPtr = FindPackage(interp, name);
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if (pkgPtr->version == NULL) {
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pkgPtr->version = ckalloc((unsigned) (strlen(version) + 1));
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strcpy(pkgPtr->version, version);
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return TCL_OK;
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}
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if (ComparePkgVersions(pkgPtr->version, version, (int *) NULL) == 0) {
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return TCL_OK;
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}
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Tcl_AppendResult(interp, "conflicting versions provided for package \"",
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name, "\": ", pkgPtr->version, ", then ", version, (char *) NULL);
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return TCL_ERROR;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_PkgRequire --
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*
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* This procedure is called by code that depends on a particular
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* version of a particular package. If the package is not already
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* provided in the interpreter, this procedure invokes a Tcl script
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* to provide it. If the package is already provided, this
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* procedure makes sure that the caller's needs don't conflict with
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* the version that is present.
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*
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* Results:
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* If successful, returns the version string for the currently
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* provided version of the package, which may be different from
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* the "version" argument. If the caller's requirements
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* cannot be met (e.g. the version requested conflicts with
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* a currently provided version, or the required version cannot
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* be found, or the script to provide the required version
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* generates an error), NULL is returned and an error
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* message is left in interp->result.
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*
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* Side effects:
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* The script from some previous "package ifneeded" command may
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* be invoked to provide the package.
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*
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*----------------------------------------------------------------------
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*/
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char *
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Tcl_PkgRequire(interp, name, version, exact)
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Tcl_Interp *interp; /* Interpreter in which package is now
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* available. */
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char *name; /* Name of desired package. */
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char *version; /* Version string for desired version;
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* NULL means use the latest version
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* available. */
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int exact; /* Non-zero means that only the particular
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* version given is acceptable. Zero means
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* use the latest compatible version. */
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{
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Package *pkgPtr;
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PkgAvail *availPtr, *bestPtr;
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char *script;
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int code, satisfies, result, pass;
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Tcl_DString command;
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/*
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* It can take up to three passes to find the package: one pass to
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* run the "package unknown" script, one to run the "package ifneeded"
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* script for a specific version, and a final pass to lookup the
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* package loaded by the "package ifneeded" script.
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*/
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for (pass = 1; ; pass++) {
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pkgPtr = FindPackage(interp, name);
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if (pkgPtr->version != NULL) {
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break;
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}
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/*
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* The package isn't yet present. Search the list of available
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* versions and invoke the script for the best available version.
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*/
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bestPtr = NULL;
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for (availPtr = pkgPtr->availPtr; availPtr != NULL;
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availPtr = availPtr->nextPtr) {
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if ((bestPtr != NULL) && (ComparePkgVersions(availPtr->version,
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bestPtr->version, (int *) NULL) <= 0)) {
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continue;
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}
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if (version != NULL) {
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result = ComparePkgVersions(availPtr->version, version,
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&satisfies);
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if ((result != 0) && exact) {
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continue;
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}
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if (!satisfies) {
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continue;
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}
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}
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bestPtr = availPtr;
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}
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if (bestPtr != NULL) {
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/*
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* We found an ifneeded script for the package. Be careful while
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* executing it: this could cause reentrancy, so (a) protect the
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* script itself from deletion and (b) don't assume that bestPtr
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* will still exist when the script completes.
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*/
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script = bestPtr->script;
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Tcl_Preserve((ClientData) script);
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code = Tcl_GlobalEval(interp, script);
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Tcl_Release((ClientData) script);
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if (code != TCL_OK) {
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if (code == TCL_ERROR) {
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Tcl_AddErrorInfo(interp,
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"\n (\"package ifneeded\" script)");
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}
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return NULL;
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}
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Tcl_ResetResult(interp);
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pkgPtr = FindPackage(interp, name);
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break;
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}
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/*
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* Package not in the database. If there is a "package unknown"
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* command, invoke it (but only on the first pass; after that,
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* we should not get here in the first place).
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*/
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if (pass > 1) {
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break;
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}
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script = ((Interp *) interp)->packageUnknown;
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if (script != NULL) {
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Tcl_DStringInit(&command);
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Tcl_DStringAppend(&command, script, -1);
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Tcl_DStringAppendElement(&command, name);
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Tcl_DStringAppend(&command, " ", 1);
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Tcl_DStringAppend(&command, (version != NULL) ? version : "{}",
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-1);
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if (exact) {
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Tcl_DStringAppend(&command, " -exact", 7);
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}
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code = Tcl_GlobalEval(interp, Tcl_DStringValue(&command));
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Tcl_DStringFree(&command);
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if (code != TCL_OK) {
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if (code == TCL_ERROR) {
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Tcl_AddErrorInfo(interp,
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"\n (\"package unknown\" script)");
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}
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return NULL;
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}
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Tcl_ResetResult(interp);
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}
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}
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if (pkgPtr->version == NULL) {
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Tcl_AppendResult(interp, "can't find package ", name,
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(char *) NULL);
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if (version != NULL) {
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Tcl_AppendResult(interp, " ", version, (char *) NULL);
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}
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return NULL;
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}
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/*
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* At this point we now that the package is present. Make sure that the
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* provided version meets the current requirement.
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*/
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if (version == NULL) {
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return pkgPtr->version;
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}
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result = ComparePkgVersions(pkgPtr->version, version, &satisfies);
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if ((satisfies && !exact) || (result == 0)) {
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return pkgPtr->version;
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}
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Tcl_AppendResult(interp, "version conflict for package \"",
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name, "\": have ", pkgPtr->version, ", need ", version,
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(char *) NULL);
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return NULL;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_PackageCmd --
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*
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* This procedure is invoked to process the "package" Tcl command.
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* See the user documentation for details on what it does.
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* See the user documentation.
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*
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*----------------------------------------------------------------------
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*/
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/* ARGSUSED */
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int
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Tcl_PackageCmd(dummy, interp, argc, argv)
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ClientData dummy; /* Not used. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. */
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{
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Interp *iPtr = (Interp *) interp;
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size_t length;
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int c, exact, i, satisfies;
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PkgAvail *availPtr, *prevPtr;
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Package *pkgPtr;
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Tcl_HashEntry *hPtr;
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Tcl_HashSearch search;
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Tcl_HashTable *tablePtr;
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char *version;
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char buf[30];
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" option ?arg arg ...?\"", (char *) NULL);
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return TCL_ERROR;
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}
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c = argv[1][0];
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length = strlen(argv[1]);
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if ((c == 'f') && (strncmp(argv[1], "forget", length) == 0)) {
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for (i = 2; i < argc; i++) {
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hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv[i]);
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if (hPtr == NULL) {
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return TCL_OK;
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}
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pkgPtr = (Package *) Tcl_GetHashValue(hPtr);
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Tcl_DeleteHashEntry(hPtr);
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if (pkgPtr->version != NULL) {
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ckfree(pkgPtr->version);
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}
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while (pkgPtr->availPtr != NULL) {
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availPtr = pkgPtr->availPtr;
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pkgPtr->availPtr = availPtr->nextPtr;
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ckfree(availPtr->version);
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Tcl_EventuallyFree((ClientData)availPtr->script, TCL_DYNAMIC);
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ckfree((char *) availPtr);
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}
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ckfree((char *) pkgPtr);
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}
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} else if ((c == 'i') && (strncmp(argv[1], "ifneeded", length) == 0)) {
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if ((argc != 4) && (argc != 5)) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" ifneeded package version ?script?\"", (char *) NULL);
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return TCL_ERROR;
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}
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if (CheckVersion(interp, argv[3]) != TCL_OK) {
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return TCL_ERROR;
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}
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if (argc == 4) {
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hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv[2]);
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if (hPtr == NULL) {
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return TCL_OK;
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}
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pkgPtr = (Package *) Tcl_GetHashValue(hPtr);
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} else {
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pkgPtr = FindPackage(interp, argv[2]);
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}
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for (availPtr = pkgPtr->availPtr, prevPtr = NULL; availPtr != NULL;
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prevPtr = availPtr, availPtr = availPtr->nextPtr) {
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if (ComparePkgVersions(availPtr->version, argv[3], (int *) NULL)
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== 0) {
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if (argc == 4) {
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Tcl_SetResult(interp, availPtr->script, TCL_VOLATILE);
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return TCL_OK;
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}
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Tcl_EventuallyFree((ClientData)availPtr->script, TCL_DYNAMIC);
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break;
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}
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}
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if (argc == 4) {
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return TCL_OK;
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}
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if (availPtr == NULL) {
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availPtr = (PkgAvail *) ckalloc(sizeof(PkgAvail));
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availPtr->version = ckalloc((unsigned) (strlen(argv[3]) + 1));
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strcpy(availPtr->version, argv[3]);
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if (prevPtr == NULL) {
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availPtr->nextPtr = pkgPtr->availPtr;
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pkgPtr->availPtr = availPtr;
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} else {
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availPtr->nextPtr = prevPtr->nextPtr;
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prevPtr->nextPtr = availPtr;
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}
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}
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availPtr->script = ckalloc((unsigned) (strlen(argv[4]) + 1));
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strcpy(availPtr->script, argv[4]);
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} else if ((c == 'n') && (strncmp(argv[1], "names", length) == 0)) {
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if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" names\"", (char *) NULL);
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return TCL_ERROR;
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}
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tablePtr = &iPtr->packageTable;
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for (hPtr = Tcl_FirstHashEntry(tablePtr, &search); hPtr != NULL;
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hPtr = Tcl_NextHashEntry(&search)) {
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pkgPtr = (Package *) Tcl_GetHashValue(hPtr);
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if ((pkgPtr->version != NULL) || (pkgPtr->availPtr != NULL)) {
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Tcl_AppendElement(interp, Tcl_GetHashKey(tablePtr, hPtr));
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}
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}
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} else if ((c == 'p') && (strncmp(argv[1], "provide", length) == 0)) {
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if ((argc != 3) && (argc != 4)) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" provide package ?version?\"", (char *) NULL);
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return TCL_ERROR;
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}
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if (argc == 3) {
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hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv[2]);
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if (hPtr != NULL) {
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pkgPtr = (Package *) Tcl_GetHashValue(hPtr);
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if (pkgPtr->version != NULL) {
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Tcl_SetResult(interp, pkgPtr->version, TCL_VOLATILE);
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}
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}
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return TCL_OK;
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}
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if (CheckVersion(interp, argv[3]) != TCL_OK) {
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return TCL_ERROR;
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}
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return Tcl_PkgProvide(interp, argv[2], argv[3]);
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} else if ((c == 'r') && (strncmp(argv[1], "require", length) == 0)) {
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if (argc < 3) {
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requireSyntax:
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" require ?-exact? package ?version?\"", (char *) NULL);
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return TCL_ERROR;
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}
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if ((argv[2][0] == '-') && (strcmp(argv[2], "-exact") == 0)) {
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exact = 1;
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} else {
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exact = 0;
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}
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version = NULL;
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if (argc == (4+exact)) {
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version = argv[3+exact];
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if (CheckVersion(interp, version) != TCL_OK) {
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return TCL_ERROR;
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}
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} else if ((argc != 3) || exact) {
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goto requireSyntax;
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}
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version = Tcl_PkgRequire(interp, argv[2+exact], version, exact);
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if (version == NULL) {
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return TCL_ERROR;
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}
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Tcl_SetResult(interp, version, TCL_VOLATILE);
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} else if ((c == 'u') && (strncmp(argv[1], "unknown", length) == 0)) {
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if (argc == 2) {
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if (iPtr->packageUnknown != NULL) {
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Tcl_SetResult(interp, iPtr->packageUnknown, TCL_VOLATILE);
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}
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} else if (argc == 3) {
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if (iPtr->packageUnknown != NULL) {
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ckfree(iPtr->packageUnknown);
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}
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if (argv[2][0] == 0) {
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iPtr->packageUnknown = NULL;
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} else {
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iPtr->packageUnknown = (char *) ckalloc((unsigned)
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(strlen(argv[2]) + 1));
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strcpy(iPtr->packageUnknown, argv[2]);
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}
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} else {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" unknown ?command?\"", (char *) NULL);
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return TCL_ERROR;
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}
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} else if ((c == 'v') && (strncmp(argv[1], "vcompare", length) == 0)
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&& (length >= 2)) {
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if (argc != 4) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" vcompare version1 version2\"", (char *) NULL);
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return TCL_ERROR;
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}
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if ((CheckVersion(interp, argv[2]) != TCL_OK)
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|| (CheckVersion(interp, argv[3]) != TCL_OK)) {
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return TCL_ERROR;
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}
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TclFormatInt(buf, ComparePkgVersions(argv[2], argv[3], (int *) NULL));
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Tcl_SetResult(interp, buf, TCL_VOLATILE);
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} else if ((c == 'v') && (strncmp(argv[1], "versions", length) == 0)
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&& (length >= 2)) {
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if (argc != 3) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" versions package\"", (char *) NULL);
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return TCL_ERROR;
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}
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hPtr = Tcl_FindHashEntry(&iPtr->packageTable, argv[2]);
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if (hPtr != NULL) {
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pkgPtr = (Package *) Tcl_GetHashValue(hPtr);
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for (availPtr = pkgPtr->availPtr; availPtr != NULL;
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availPtr = availPtr->nextPtr) {
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Tcl_AppendElement(interp, availPtr->version);
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}
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}
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} else if ((c == 'v') && (strncmp(argv[1], "vsatisfies", length) == 0)
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&& (length >= 2)) {
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if (argc != 4) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
|
||
" vsatisfies version1 version2\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
if ((CheckVersion(interp, argv[2]) != TCL_OK)
|
||
|| (CheckVersion(interp, argv[3]) != TCL_OK)) {
|
||
return TCL_ERROR;
|
||
}
|
||
ComparePkgVersions(argv[2], argv[3], &satisfies);
|
||
TclFormatInt(buf, satisfies);
|
||
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
||
} else {
|
||
Tcl_AppendResult(interp, "bad option \"", argv[1],
|
||
"\": should be forget, ifneeded, names, ",
|
||
"provide, require, unknown, vcompare, ",
|
||
"versions, or vsatisfies", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
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. */
|
||
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;
|
||
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; /* Interpereter 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;
|
||
ckfree(availPtr->version);
|
||
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 --
|
||
*
|
||
* 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 interp->result.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
CheckVersion(interp, string)
|
||
Tcl_Interp *interp; /* Used for error reporting. */
|
||
char *string; /* Supposedly a version number, which is
|
||
* groups of decimal digits separated
|
||
* by dots. */
|
||
{
|
||
char *p = string;
|
||
|
||
if (!isdigit(UCHAR(*p))) {
|
||
goto error;
|
||
}
|
||
for (p++; *p != 0; p++) {
|
||
if (!isdigit(UCHAR(*p)) && (*p != '.')) {
|
||
goto error;
|
||
}
|
||
}
|
||
if (p[-1] != '.') {
|
||
return TCL_OK;
|
||
}
|
||
|
||
error:
|
||
Tcl_AppendResult(interp, "expected version number but got \"",
|
||
string, "\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ComparePkgVersions --
|
||
*
|
||
* This procedure compares two version numbers.
|
||
*
|
||
* 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
|
||
ComparePkgVersions(v1, v2, satPtr)
|
||
char *v1, *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 ".". 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;
|
||
}
|
||
}
|