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zsh/Src/module.c

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/*
* module.c - deal with dynamic modules
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1996-1997 Zoltán Hidvégi
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Zoltán Hidvégi or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Zoltán Hidvégi and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Zoltán Hidvégi and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Zoltán Hidvégi and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*/
#include "zsh.mdh"
#include "module.pro"
/*
* List of linked-in modules.
* This is set up at boot and remains for the life of the shell;
* entries do not appear in "zmodload" listings.
*/
/**/
LinkList linkedmodules;
/* $module_path ($MODULE_PATH) */
/**/
char **module_path;
/* Hash of modules */
/**/
mod_export HashTable modulestab;
/*
* Bit flags passed as the "flags" argument of a autofeaturefn_t.
* Used in other places, such as the final argument to
* do_module_features().
*/
enum {
/*
* `-i' option: ignore errors pertaining to redefinitions,
* or indicate to do_module_features() that it should be
* silent.
*/
FEAT_IGNORE = 0x0001,
/* If a condition, condition is infix rather than prefix */
FEAT_INFIX = 0x0002,
/*
* Enable all features in the module when autoloading.
* This is the traditional zmodload -a behaviour;
* zmodload -Fa only enables features explicitly marked for
* autoloading.
*/
FEAT_AUTOALL = 0x0004,
/*
* Remove feature: alternative to "-X:NAME" used if
* X is passed separately from NAME.
*/
FEAT_REMOVE = 0x0008,
/*
* For do_module_features(). Check that any autoloads
* for the module are actually provided.
*/
FEAT_CHECKAUTO = 0x0010
};
/*
* All functions to add or remove autoloadable features fit
* the following prototype.
*
* "module" is the name of the module.
*
* "feature" is the name of the feature, minus any type prefix.
*
* "flags" is a set of the bits above.
*
* The return value is 0 for success, -1 for failure with no
* message needed, and one of the following to indicate the calling
* function should print a message:
*
* 1: failed to add [type] `[feature]'
* 2: [feature]: no such [type]
* 3: [feature]: [type] is already defined
*/
typedef int (*autofeaturefn_t)(const char *module, const char *feature,
int flags);
/* Bits in the second argument to find_module. */
enum {
/*
* Resolve any aliases to the underlying module.
*/
FINDMOD_ALIASP = 0x0001,
/*
* Create an element for the module in the list if
* it is not found.
*/
FINDMOD_CREATE = 0x0002,
};
static void
freemodulenode(HashNode hn)
{
Module m = (Module) hn;
if (m->node.flags & MOD_ALIAS)
zsfree(m->u.alias);
zsfree(m->node.nam);
if (m->autoloads)
freelinklist(m->autoloads, freestr);
if (m->deps)
freelinklist(m->deps, freestr);
zfree(m, sizeof(*m));
}
/* flags argument to printmodulenode */
enum {
/* -L flag, output zmodload commands */
PRINTMOD_LIST = 0x0001,
/* -e flag */
PRINTMOD_EXIST = 0x0002,
/* -A flag */
PRINTMOD_ALIAS = 0x0004,
/* -d flag */
PRINTMOD_DEPS = 0x0008,
/* -F flag */
PRINTMOD_FEATURES = 0x0010,
/* -l flag in combination with -L flag */
PRINTMOD_LISTALL = 0x0020,
/* -a flag */
PRINTMOD_AUTO = 0x0040
};
/* Scan function for printing module details */
static void
printmodulenode(HashNode hn, int flags)
{
Module m = (Module)hn;
/*
* If we check for a module loaded under an alias, we
* need the name of the alias. We can use it in other
* cases, too.
*/
const char *modname = m->node.nam;
if (flags & PRINTMOD_DEPS) {
/*
* Print the module's dependencies.
*/
LinkNode n;
if (!m->deps)
return;
if (flags & PRINTMOD_LIST) {
printf("zmodload -d ");
if (modname[0] == '-')
fputs("-- ", stdout);
quotedzputs(modname, stdout);
} else {
nicezputs(modname, stdout);
putchar(':');
}
for (n = firstnode(m->deps); n; incnode(n)) {
putchar(' ');
if (flags & PRINTMOD_LIST)
quotedzputs((char *) getdata(n), stdout);
else
nicezputs((char *) getdata(n), stdout);
}
} else if (flags & PRINTMOD_EXIST) {
/*
* Just print the module name, provided the module is
* present under an alias or otherwise.
*/
if (m->node.flags & MOD_ALIAS) {
if (!(flags & PRINTMOD_ALIAS) ||
!(m = find_module(m->u.alias, FINDMOD_ALIASP, NULL)))
return;
}
if (!m->u.handle || (m->node.flags & MOD_UNLOAD))
return;
nicezputs(modname, stdout);
} else if (m->node.flags & MOD_ALIAS) {
/*
* Normal listing, but for aliases.
*/
if (flags & PRINTMOD_LIST) {
printf("zmodload -A ");
if (modname[0] == '-')
fputs("-- ", stdout);
quotedzputs(modname, stdout);
putchar('=');
quotedzputs(m->u.alias, stdout);
} else {
nicezputs(modname, stdout);
fputs(" -> ", stdout);
nicezputs(m->u.alias, stdout);
}
} else if (m->u.handle || (flags & PRINTMOD_AUTO)) {
/*
* Loaded module.
*/
if (flags & PRINTMOD_LIST) {
/*
* List with -L format. Possibly we are printing
* features, either enables or autoloads.
*/
char **features = NULL;
int *enables = NULL;
if (flags & PRINTMOD_AUTO) {
if (!m->autoloads || !firstnode(m->autoloads))
return;
} else if (flags & PRINTMOD_FEATURES) {
if (features_module(m, &features) ||
enables_module(m, &enables) ||
!*features)
return;
}
printf("zmodload ");
if (flags & PRINTMOD_AUTO) {
fputs("-Fa ", stdout);
} else if (features)
fputs("-F ", stdout);
if(modname[0] == '-')
fputs("-- ", stdout);
quotedzputs(modname, stdout);
if (flags & PRINTMOD_AUTO) {
LinkNode an;
for (an = firstnode(m->autoloads); an; incnode(an)) {
putchar(' ');
quotedzputs((char *)getdata(an), stdout);
}
} else if (features) {
const char *f;
while ((f = *features++)) {
int on = *enables++;
if (flags & PRINTMOD_LISTALL)
printf(" %s", on ? "+" : "-");
else if (!on)
continue;
else
putchar(' ');
quotedzputs(f, stdout);
}
}
} else /* -l */
nicezputs(modname, stdout);
} else
return;
putchar('\n');
}
/**/
HashTable
newmoduletable(int size, char const *name)
{
HashTable ht;
ht = newhashtable(size, name, NULL);
ht->hash = hasher;
ht->emptytable = emptyhashtable;
ht->filltable = NULL;
ht->cmpnodes = strcmp;
ht->addnode = addhashnode;
/* DISABLED is not supported */
ht->getnode = gethashnode2;
ht->getnode2 = gethashnode2;
ht->removenode = removehashnode;
ht->disablenode = NULL;
ht->enablenode = NULL;
ht->freenode = freemodulenode;
ht->printnode = printmodulenode;
return ht;
}
/************************************************************************
* zsh/main standard module functions
************************************************************************/
/* The `zsh/main' module contains all the base code that can't actually be *
* built as a separate module. It is initialised by main(), so there's *
* nothing for the boot function to do. */
/**/
int
setup_(UNUSED(Module m))
{
return 0;
}
/**/
int
features_(UNUSED(Module m), UNUSED(char ***features))
{
/*
* There are lots and lots of features, but they're not
* handled here.
*/
return 1;
}
/**/
int
enables_(UNUSED(Module m), UNUSED(int **enables))
{
return 1;
}
/**/
int
boot_(UNUSED(Module m))
{
return 0;
}
/**/
int
cleanup_(UNUSED(Module m))
{
return 0;
}
/**/
int
finish_(UNUSED(Module m))
{
return 0;
}
/************************************************************************
* Module utility functions
************************************************************************/
/* This registers a builtin module. */
/**/
void
register_module(char *n, Module_void_func setup,
Module_features_func features,
Module_enables_func enables,
Module_void_func boot,
Module_void_func cleanup,
Module_void_func finish)
{
Linkedmod m;
m = (Linkedmod) zalloc(sizeof(*m));
m->name = ztrdup(n);
m->setup = setup;
m->features = features;
m->enables = enables;
m->boot = boot;
m->cleanup = cleanup;
m->finish = finish;
zaddlinknode(linkedmodules, m);
}
/* Check if a module is linked in. */
/**/
Linkedmod
module_linked(char const *name)
{
LinkNode node;
for (node = firstnode(linkedmodules); node; incnode(node))
if (!strcmp(((Linkedmod) getdata(node))->name, name))
return (Linkedmod) getdata(node);
return NULL;
}
/************************************************************************
* Support for the various feature types.
* First, builtins.
************************************************************************/
/* addbuiltin() can be used to add a new builtin. It returns zero on *
* success, 1 on failure. The only possible type of failure is that *
* a builtin with the specified name already exists. An autoloaded *
* builtin can be replaced using this function. */
/**/
static int
addbuiltin(Builtin b)
{
Builtin bn = (Builtin) builtintab->getnode2(builtintab, b->node.nam);
if (bn && (bn->node.flags & BINF_ADDED))
return 1;
if (bn)
builtintab->freenode(builtintab->removenode(builtintab, b->node.nam));
builtintab->addnode(builtintab, b->node.nam, b);
return 0;
}
/* Define an autoloadable builtin. It returns 0 on success, or 1 on *
* failure. The only possible cause of failure is that a builtin *
* with the specified name already exists. */
/**/
static int
add_autobin(const char *module, const char *bnam, int flags)
{
Builtin bn;
int ret;
bn = zshcalloc(sizeof(*bn));
bn->node.nam = ztrdup(bnam);
bn->optstr = ztrdup(module);
if (flags & FEAT_AUTOALL)
bn->node.flags |= BINF_AUTOALL;
if ((ret = addbuiltin(bn))) {
builtintab->freenode(&bn->node);
if (!(flags & FEAT_IGNORE))
return 1;
}
return 0;
}
/* Remove the builtin added previously by addbuiltin(). Returns *
* zero on success and -1 if there is no builtin with that name. */
/**/
int
deletebuiltin(const char *nam)
{
Builtin bn;
bn = (Builtin) builtintab->removenode(builtintab, nam);
if (!bn)
return -1;
builtintab->freenode(&bn->node);
return 0;
}
/* Remove an autoloaded added by add_autobin */
/**/
static int
del_autobin(UNUSED(const char *module), const char *bnam, int flags)
{
Builtin bn = (Builtin) builtintab->getnode2(builtintab, bnam);
if (!bn) {
if(!(flags & FEAT_IGNORE))
return 2;
} else if (bn->node.flags & BINF_ADDED) {
if (!(flags & FEAT_IGNORE))
return 3;
} else
deletebuiltin(bnam);
return 0;
}
/*
* Manipulate a set of builtins. This should be called
* via setfeatureenables() (or, usually, via the next level up,
* handlefeatures()).
*
* "nam" is the name of the calling code builtin, probably "zmodload".
*
* "binl" is the builtin table containing an array of "size" builtins.
*
* "e" is either NULL, in which case all builtins in the
* table are removed, or else an array corresponding to "binl"
* with a 1 for builtins that are to be added and a 0 for builtins
* that are to be removed. Any builtin already in the appropriate
* state is left alone.
*
* Returns 1 on any error, 0 for success. The recommended way
* of handling errors is to compare the enables passed down
* with the set retrieved after the error to find what failed.
*/
/**/
static int
setbuiltins(char const *nam, Builtin binl, int size, int *e)
{
int ret = 0, n;
for(n = 0; n < size; n++) {
Builtin b = &binl[n];
if (e && *e++) {
if (b->node.flags & BINF_ADDED)
continue;
if (addbuiltin(b)) {
zwarnnam(nam,
"name clash when adding builtin `%s'", b->node.nam);
ret = 1;
} else {
b->node.flags |= BINF_ADDED;
}
} else {
if (!(b->node.flags & BINF_ADDED))
continue;
if (deletebuiltin(b->node.nam)) {
zwarnnam(nam, "builtin `%s' already deleted", b->node.nam);
ret = 1;
} else {
b->node.flags &= ~BINF_ADDED;
}
}
}
return ret;
}
/*
* Add multiple builtins. binl points to a table of `size' builtin
* structures. Those for which (.flags & BINF_ADDED) is false are to be
* added; that flag is set if they succeed.
*
* If any fail, an error message is printed, using nam as the leading name.
* Returns 0 on success, 1 for any failure.
*
* This should not be used from a module; instead, use handlefeatures().
*/
/**/
mod_export int
addbuiltins(char const *nam, Builtin binl, int size)
{
int ret = 0, n;
for(n = 0; n < size; n++) {
Builtin b = &binl[n];
if(b->node.flags & BINF_ADDED)
continue;
if(addbuiltin(b)) {
zwarnnam(nam, "name clash when adding builtin `%s'", b->node.nam);
ret = 1;
} else {
b->node.flags |= BINF_ADDED;
}
}
return ret;
}
/************************************************************************
* Function wrappers.
************************************************************************/
/* The list of function wrappers defined. */
/**/
FuncWrap wrappers;
/* This adds a definition for a wrapper. Return value is one in case of *
* error and zero if all went fine. */
/**/
mod_export int
addwrapper(Module m, FuncWrap w)
{
FuncWrap p, q;
/*
* We can't add a wrapper to an alias, since it's supposed
* to behave identically to the resolved module. This shouldn't
* happen since we usually add wrappers when a real module is
* loaded.
*/
if (m->node.flags & MOD_ALIAS)
return 1;
if (w->flags & WRAPF_ADDED)
return 1;
for (p = wrappers, q = NULL; p; q = p, p = p->next);
if (q)
q->next = w;
else
wrappers = w;
w->next = NULL;
w->flags |= WRAPF_ADDED;
w->module = m;
return 0;
}
/* This removes the given wrapper definition from the list. Returned is *
* one in case of error and zero otherwise. */
/**/
mod_export int
deletewrapper(Module m, FuncWrap w)
{
FuncWrap p, q;
if (m->node.flags & MOD_ALIAS)
return 1;
if (w->flags & WRAPF_ADDED) {
for (p = wrappers, q = NULL; p && p != w; q = p, p = p->next);
if (p) {
if (q)
q->next = p->next;
else
wrappers = p->next;
p->flags &= ~WRAPF_ADDED;
return 0;
}
}
return 1;
}
/************************************************************************
* Conditions.
************************************************************************/
/* The list of module-defined conditions. */
/**/
mod_export Conddef condtab;
/* This gets a condition definition with the given name. The first *
* argument says if we have to look for an infix condition. The last *
* argument is non-zero if we should autoload modules if needed. */
/**/
Conddef
getconddef(int inf, const char *name, int autol)
{
Conddef p;
int f = 1;
char *lookup, *s;
/* detokenize the Dash to the form encoded in lookup tables */
lookup = dupstring(name);
if (!lookup)
return NULL;
for (s = lookup; *s != '\0'; s++) {
if (*s == Dash)
*s = '-';
}
do {
for (p = condtab; p; p = p->next) {
if ((!!inf == !!(p->flags & CONDF_INFIX)) &&
!strcmp(lookup, p->name))
break;
}
if (autol && p && p->module) {
/*
* This is a definition for an autoloaded condition; load the
* module if we haven't tried that already.
*/
if (f) {
(void)ensurefeature(p->module,
(p->flags & CONDF_INFIX) ? "C:" : "c:",
(p->flags & CONDF_AUTOALL) ? NULL : lookup);
f = 0;
p = NULL;
} else {
deleteconddef(p);
return NULL;
}
} else
break;
} while (!p);
return p;
}
/*
* This adds the given condition definition. The return value is zero on *
* success and 1 on failure. If there is a matching definition for an *
* autoloaded condition, it is removed.
*
* This is used for adding both an autoload definition or
* a real condition. In the latter case the caller is responsible
* for setting the CONDF_ADDED flag.
*/
/**/
static int
addconddef(Conddef c)
{
Conddef p = getconddef((c->flags & CONDF_INFIX), c->name, 0);
if (p) {
if (!p->module || (p->flags & CONDF_ADDED))
return 1;
/* There is an autoload definition. */
deleteconddef(p);
}
c->next = condtab;
condtab = c;
return 0;
}
/* This removes the given condition definition from the list(s). If this *
* is a definition for a autoloaded condition, the memory is freed. */
/**/
int
deleteconddef(Conddef c)
{
Conddef p, q;
for (p = condtab, q = NULL; p && p != c; q = p, p = p->next);
if (p) {
if (q)
q->next = p->next;
else
condtab = p->next;
if (p->module) {
/* autoloaded, free it */
zsfree(p->name);
zsfree(p->module);
zfree(p, sizeof(*p));
}
return 0;
}
return -1;
}
/*
* Add or remove sets of conditions. The interface is
* identical to setbuiltins().
*/
/**/
static int
setconddefs(char const *nam, Conddef c, int size, int *e)
{
int ret = 0;
while (size--) {
if (e && *e++) {
if (c->flags & CONDF_ADDED) {
c++;
continue;
}
if (addconddef(c)) {
zwarnnam(nam, "name clash when adding condition `%s'",
c->name);
ret = 1;
} else {
c->flags |= CONDF_ADDED;
}
} else {
if (!(c->flags & CONDF_ADDED)) {
c++;
continue;
}
if (deleteconddef(c)) {
zwarnnam(nam, "condition `%s' already deleted", c->name);
ret = 1;
} else {
c->flags &= ~CONDF_ADDED;
}
}
c++;
}
return ret;
}
/* This adds a definition for autoloading a module for a condition. */
/**/
static int
add_autocond(const char *module, const char *cnam, int flags)
{
Conddef c;
c = (Conddef) zalloc(sizeof(*c));
c->name = ztrdup(cnam);
c->flags = ((flags & FEAT_INFIX) ? CONDF_INFIX : 0);
if (flags & FEAT_AUTOALL)
c->flags |= CONDF_AUTOALL;
c->module = ztrdup(module);
if (addconddef(c)) {
zsfree(c->name);
zsfree(c->module);
zfree(c, sizeof(*c));
if (!(flags & FEAT_IGNORE))
return 1;
}
return 0;
}
/* Remove a condition added with add_autocond */
/**/
static int
del_autocond(UNUSED(const char *modnam), const char *cnam, int flags)
{
Conddef cd = getconddef((flags & FEAT_INFIX) ? 1 : 0, cnam, 0);
if (!cd) {
if (!(flags & FEAT_IGNORE)) {
return 2;
}
} else if (cd->flags & CONDF_ADDED) {
if (!(flags & FEAT_IGNORE))
return 3;
} else
deleteconddef(cd);
return 0;
}
/************************************************************************
* Hook functions.
************************************************************************/
/* This list of hook functions defined. */
/**/
Hookdef hooktab;
/* Find a hook definition given the name. */
/**/
Hookdef
gethookdef(char *n)
{
Hookdef p;
for (p = hooktab; p; p = p->next)
if (!strcmp(n, p->name))
return p;
return NULL;
}
/* This adds the given hook definition. The return value is zero on *
* success and 1 on failure. */
/**/
int
addhookdef(Hookdef h)
{
if (gethookdef(h->name))
return 1;
h->next = hooktab;
hooktab = h;
h->funcs = znewlinklist();
return 0;
}
/*
* This adds multiple hook definitions. This is like addbuiltins().
* This allows a NULL module because we call it from init.c.
*/
/**/
mod_export int
addhookdefs(Module m, Hookdef h, int size)
{
int ret = 0;
while (size--) {
if (addhookdef(h)) {
zwarnnam(m ? m->node.nam : NULL,
"name clash when adding hook `%s'", h->name);
ret = 1;
}
h++;
}
return ret;
}
/* Delete hook definitions. */
/**/
int
deletehookdef(Hookdef h)
{
Hookdef p, q;
for (p = hooktab, q = NULL; p && p != h; q = p, p = p->next);
if (!p)
return 1;
if (q)
q->next = p->next;
else
hooktab = p->next;
freelinklist(p->funcs, NULL);
return 0;
}
/* Remove multiple hook definitions. */
/**/
mod_export int
deletehookdefs(UNUSED(Module m), Hookdef h, int size)
{
int ret = 0;
while (size--) {
if (deletehookdef(h))
ret = 1;
h++;
}
return ret;
}
/* Add a function to a hook. */
/**/
int
addhookdeffunc(Hookdef h, Hookfn f)
{
zaddlinknode(h->funcs, (void *) f);
return 0;
}
/**/
mod_export int
addhookfunc(char *n, Hookfn f)
{
Hookdef h = gethookdef(n);
if (h)
return addhookdeffunc(h, f);
return 1;
}
/* Delete a function from a hook. */
/**/
int
deletehookdeffunc(Hookdef h, Hookfn f)
{
LinkNode p;
for (p = firstnode(h->funcs); p; incnode(p))
if (f == (Hookfn) getdata(p)) {
remnode(h->funcs, p);
return 0;
}
return 1;
}
/* Delete a hook. */
/**/
mod_export int
deletehookfunc(char *n, Hookfn f)
{
Hookdef h = gethookdef(n);
if (h)
return deletehookdeffunc(h, f);
return 1;
}
/* Run the function(s) for a hook. */
/**/
mod_export int
runhookdef(Hookdef h, void *d)
{
if (empty(h->funcs)) {
if (h->def)
return h->def(h, d);
return 0;
} else if (h->flags & HOOKF_ALL) {
LinkNode p;
int r;
for (p = firstnode(h->funcs); p; incnode(p))
if ((r = ((Hookfn) getdata(p))(h, d)))
return r;
if (h->def)
return h->def(h, d);
return 0;
} else
return ((Hookfn) getdata(lastnode(h->funcs)))(h, d);
}
/************************************************************************
* Shell parameters.
************************************************************************/
/*
* Check that it's possible to add a parameter. This
* requires that either there's no parameter already present,
* or it's a global parameter marked for autoloading.
*
* The special status 2 is to indicate it didn't work but
* -i was in use so we didn't print a warning.
*/
static int
checkaddparam(const char *nam, int opt_i)
{
Param pm;
if (!(pm = (Param) gethashnode2(paramtab, nam)))
return 0;
if (pm->level || !(pm->node.flags & PM_AUTOLOAD)) {
/*
* -i suppresses "it's already that way" warnings,
* but not "this can't possibly work" warnings, so we print
* the message anyway if there's a local parameter blocking
* the parameter we want to add, not if there's a
* non-autoloadable parameter already there. This
* is consistent with the way add_auto* functions work.
*/
if (!opt_i || pm->level) {
zwarn("Can't add module parameter `%s': %s",
nam, pm->level ?
"local parameter exists" :
"parameter already exists");
return 1;
}
return 2;
}
unsetparam_pm(pm, 0, 1);
return 0;
}
/* This adds the given parameter definition. The return value is zero on *
* success and 1 on failure. */
/**/
int
addparamdef(Paramdef d)
{
Param pm;
if (checkaddparam(d->name, 0))
return 1;
if (d->getnfn) {
if (!(pm = createspecialhash(d->name, d->getnfn,
d->scantfn, d->flags)))
return 1;
}
else if (!(pm = createparam(d->name, d->flags)) &&
!(pm = (Param) paramtab->getnode(paramtab, d->name)))
return 1;
d->pm = pm;
pm->level = 0;
if (d->var)
pm->u.data = d->var;
if (d->var || d->gsu) {
/*
* If no get/set/unset class, use the appropriate
* variable type, else use the one supplied.
*/
switch (PM_TYPE(pm->node.flags)) {
case PM_SCALAR:
pm->gsu.s = d->gsu ? (GsuScalar)d->gsu : &varscalar_gsu;
break;
case PM_INTEGER:
pm->gsu.i = d->gsu ? (GsuInteger)d->gsu : &varinteger_gsu;
break;
case PM_FFLOAT:
case PM_EFLOAT:
pm->gsu.f = d->gsu;
break;
case PM_ARRAY:
pm->gsu.a = d->gsu ? (GsuArray)d->gsu : &vararray_gsu;
break;
case PM_HASHED:
/* hashes may behave like standard hashes */
if (d->gsu)
pm->gsu.h = (GsuHash)d->gsu;
break;
default:
unsetparam_pm(pm, 0, 1);
return 1;
}
}
return 0;
}
/* Delete parameters defined. No error checking yet. */
/**/
int
deleteparamdef(Paramdef d)
{
Param pm = (Param) paramtab->getnode(paramtab, d->name);
if (!pm)
return 1;
if (pm != d->pm) {
/*
* See if the parameter has been hidden. If so,
* bring it to the front to unset it.
*/
Param prevpm, searchpm;
for (prevpm = pm, searchpm = pm->old;
searchpm;
prevpm = searchpm, searchpm = searchpm->old)
if (searchpm == d->pm)
break;
if (!searchpm)
return 1;
paramtab->removenode(paramtab, pm->node.nam);
prevpm->old = searchpm->old;
searchpm->old = pm;
paramtab->addnode(paramtab, searchpm->node.nam, searchpm);
pm = searchpm;
}
pm->node.flags = (pm->node.flags & ~PM_READONLY) | PM_REMOVABLE;
unsetparam_pm(pm, 0, 1);
d->pm = NULL;
return 0;
}
/*
* Add or remove sets of parameters. The interface is
* identical to setbuiltins().
*/
/**/
static int
setparamdefs(char const *nam, Paramdef d, int size, int *e)
{
int ret = 0;
while (size--) {
if (e && *e++) {
if (d->pm) {
d++;
continue;
}
if (addparamdef(d)) {
zwarnnam(nam, "error when adding parameter `%s'", d->name);
ret = 1;
}
} else {
if (!d->pm) {
d++;
continue;
}
if (deleteparamdef(d)) {
zwarnnam(nam, "parameter `%s' already deleted", d->name);
ret = 1;
}
}
d++;
}
return ret;
}
/* This adds a definition for autoloading a module for a parameter. */
/**/
static int
add_autoparam(const char *module, const char *pnam, int flags)
{
Param pm;
int ret;
queue_signals();
if ((ret = checkaddparam(pnam, (flags & FEAT_IGNORE)))) {
unqueue_signals();
/*
* checkaddparam() has already printed a message if one was
* needed. If it wasn't owing to the presence of -i, ret is 2;
* for consistency with other add_auto* functions we return
* status 0 to indicate there's already such a parameter and
* we've been told not to worry if so.
*/
return ret == 2 ? 0 : -1;
}
pm = setsparam(dupstring(pnam), ztrdup(module));
pm->node.flags |= PM_AUTOLOAD;
if (flags & FEAT_AUTOALL)
pm->node.flags |= PM_AUTOALL;
unqueue_signals();
return 0;
}
/* Remove a parameter added with add_autoparam() */
/**/
static int
del_autoparam(UNUSED(const char *modnam), const char *pnam, int flags)
{
Param pm = (Param) gethashnode2(paramtab, pnam);
if (!pm) {
if (!(flags & FEAT_IGNORE))
return 2;
} else if (!(pm->node.flags & PM_AUTOLOAD)) {
if (!(flags & FEAT_IGNORE))
return 3;
} else
unsetparam_pm(pm, 0, 1);
return 0;
}
/************************************************************************
* Math functions.
************************************************************************/
/* List of math functions. */
/**/
MathFunc mathfuncs;
/*
* Remove a single math function form the list (utility function).
* This does not delete a module math function, that's deletemathfunc().
*/
/**/
void
removemathfunc(MathFunc previous, MathFunc current)
{
if (previous)
previous->next = current->next;
else
mathfuncs = current->next;
zsfree(current->name);
zsfree(current->module);
zfree(current, sizeof(*current));
}
/* Find a math function in the list, handling autoload if necessary. */
/**/
MathFunc
getmathfunc(const char *name, int autol)
{
MathFunc p, q = NULL;
for (p = mathfuncs; p; q = p, p = p->next)
if (!strcmp(name, p->name)) {
if (autol && p->module && !(p->flags & MFF_USERFUNC)) {
char *n = dupstring(p->module);
int flags = p->flags;
removemathfunc(q, p);
(void)ensurefeature(n, "f:", (flags & MFF_AUTOALL) ? NULL :
name);
p = getmathfunc(name, 0);
if (!p) {
zerr("autoloading module %s failed to define math function: %s", n, name);
}
}
return p;
}
return NULL;
}
/* Add a single math function */
/**/
static int
addmathfunc(MathFunc f)
{
MathFunc p, q = NULL;
if (f->flags & MFF_ADDED)
return 1;
for (p = mathfuncs; p; q = p, p = p->next)
if (!strcmp(f->name, p->name)) {
if (p->module && !(p->flags & MFF_USERFUNC)) {
/*
* Autoloadable, replace.
*/
removemathfunc(q, p);
break;
}
return 1;
}
f->next = mathfuncs;
mathfuncs = f;
return 0;
}
/* Delete a single math function */
/**/
mod_export int
deletemathfunc(MathFunc f)
{
MathFunc p, q;
for (p = mathfuncs, q = NULL; p && p != f; q = p, p = p->next);
if (p) {
if (q)
q->next = f->next;
else
mathfuncs = f->next;
/* the following applies to both unloaded and user-defined functions */
if (f->module) {
zsfree(f->name);
zsfree(f->module);
zfree(f, sizeof(*f));
} else
f->flags &= ~MFF_ADDED;
return 0;
}
return -1;
}
/*
* Add or remove sets of math functions. The interface is
* identical to setbuiltins().
*/
/**/
static int
setmathfuncs(char const *nam, MathFunc f, int size, int *e)
{
int ret = 0;
while (size--) {
if (e && *e++) {
if (f->flags & MFF_ADDED) {
f++;
continue;
}
if (addmathfunc(f)) {
zwarnnam(nam, "name clash when adding math function `%s'",
f->name);
ret = 1;
} else {
f->flags |= MFF_ADDED;
}
} else {
if (!(f->flags & MFF_ADDED)) {
f++;
continue;
}
if (deletemathfunc(f)) {
zwarnnam(nam, "math function `%s' already deleted", f->name);
ret = 1;
}
}
f++;
}
return ret;
}
/* Add an autoload definition for a math function. */
/**/
static int
add_automathfunc(const char *module, const char *fnam, int flags)
{
MathFunc f;
f = (MathFunc) zalloc(sizeof(*f));
f->name = ztrdup(fnam);
f->module = ztrdup(module);
f->flags = 0;
if (addmathfunc(f)) {
zsfree(f->name);
zsfree(f->module);
zfree(f, sizeof(*f));
if (!(flags & FEAT_IGNORE))
return 1;
}
return 0;
}
/* Remove a math function added with add_automathfunc() */
/**/
static int
del_automathfunc(UNUSED(const char *modnam), const char *fnam, int flags)
{
MathFunc f = getmathfunc(fnam, 0);
if (!f) {
if (!(flags & FEAT_IGNORE))
return 2;
} else if (f->flags & MFF_ADDED) {
if (!(flags & FEAT_IGNORE))
return 3;
} else
deletemathfunc(f);
return 0;
}
/************************************************************************
* Now support for dynamical loading and the fallback functions
* we use for loading if dynamical loading is not available.
************************************************************************/
/**/
#ifdef DYNAMIC
/**/
#ifdef AIXDYNAMIC
#include <sys/ldr.h>
static char *dlerrstr[256];
static void *
load_and_bind(const char *fn)
{
void *ret = (void *) load((char *) fn, L_NOAUTODEFER, NULL);
if (ret) {
Module m;
int i, err = loadbind(0, (void *) addbuiltin, ret);
for (i = 0; i < modulestab->hsize && !err; i++) {
for (m = (Module)modulestab->nodes[i]; m && !err;
m = (Module)m->node.next) {
if (!(m->node.flags & MOD_ALIAS) &&
m->u.handle && !(m->node.flags & MOD_LINKED))
err |= loadbind(0, m->u.handle, ret);
}
}
if (err) {
loadquery(L_GETMESSAGES, dlerrstr, sizeof(dlerrstr));
unload(ret);
ret = NULL;
}
} else
loadquery(L_GETMESSAGES, dlerrstr, sizeof(dlerrstr));
return ret;
}
#define dlopen(X,Y) load_and_bind(X)
#define dlclose(X) unload(X)
#define dlerror() (dlerrstr[0])
#ifndef HAVE_DLERROR
# define HAVE_DLERROR 1
#endif
/**/
#else
#ifdef HAVE_DLFCN_H
# if defined(HAVE_DL_H) && defined(HPUX10DYNAMIC)
# include <dl.h>
# else
# include <dlfcn.h>
# endif
#else
# ifdef HAVE_DL_H
# include <dl.h>
# define RTLD_LAZY BIND_DEFERRED
# define RTLD_GLOBAL DYNAMIC_PATH
# else
# include <sys/types.h>
# include <nlist.h>
# include <link.h>
# endif
#endif
/**/
#ifdef HPUX10DYNAMIC
# define dlopen(file,mode) (void *)shl_load((file), (mode), (long) 0)
# define dlclose(handle) shl_unload((shl_t)(handle))
static
void *
hpux_dlsym(void *handle, char *name)
{
void *sym_addr;
if (!shl_findsym((shl_t *)&handle, name, TYPE_UNDEFINED, &sym_addr))
return sym_addr;
return NULL;
}
# define dlsym(handle,name) hpux_dlsym(handle,name)
# ifdef HAVE_DLERROR /* paranoia */
# undef HAVE_DLERROR
# endif
#else
# ifndef HAVE_DLCLOSE
# define dlclose(X) ((X), 0)
# endif
/**/
#endif
#ifdef DLSYM_NEEDS_UNDERSCORE
# define STR_SETUP "_setup_"
# define STR_FEATURES "_features_"
# define STR_ENABLES "_enables_"
# define STR_BOOT "_boot_"
# define STR_CLEANUP "_cleanup_"
# define STR_FINISH "_finish_"
#else /* !DLSYM_NEEDS_UNDERSCORE */
# define STR_SETUP "setup_"
# define STR_FEATURES "features_"
# define STR_ENABLES "enables_"
# define STR_BOOT "boot_"
# define STR_CLEANUP "cleanup_"
# define STR_FINISH "finish_"
#endif /* !DLSYM_NEEDS_UNDERSCORE */
/**/
#endif /* !AIXDYNAMIC */
#ifndef RTLD_LAZY
# define RTLD_LAZY 1
#endif
#ifndef RTLD_GLOBAL
# define RTLD_GLOBAL 0
#endif
/*
* Attempt to load a module. This is the lowest level of
* zsh function for dynamical modules. Returns the handle
* from the dynamic loader.
*/
/**/
static void *
try_load_module(char const *name)
{
char buf[PATH_MAX + 1];
char **pp;
void *ret = NULL;
int l;
l = 1 + strlen(name) + 1 + strlen(DL_EXT);
for (pp = module_path; !ret && *pp; pp++) {
if (l + (**pp ? strlen(*pp) : 1) > PATH_MAX)
continue;
sprintf(buf, "%s/%s.%s", **pp ? *pp : ".", name, DL_EXT);
unmetafy(buf, NULL);
if (*buf) /* dlopen(NULL) returns a handle to the main binary */
ret = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
}
return ret;
}
/*
* Load a module, with option to complain or not.
* Returns the handle from the dynamic loader.
*/
/**/
static void *
do_load_module(char const *name, int silent)
{
void *ret;
ret = try_load_module(name);
if (!ret && !silent) {
#ifdef HAVE_DLERROR
char *errstr = dlerror();
zwarn("failed to load module `%s': %s", name,
errstr ? metafy(errstr, -1, META_HEAPDUP) : "empty module path");
#else
zwarn("failed to load module: %s", name);
#endif
}
return ret;
}
/**/
#else /* !DYNAMIC */
/*
* Dummy loader when no dynamic loading available; always fails.
*/
/**/
static void *
do_load_module(char const *name, int silent)
{
if (!silent)
zwarn("failed to load module: %s", name);
return NULL;
}
/**/
#endif /* !DYNAMIC */
/*
* Find a module in the list.
* flags is a set of bits defined in the enum above.
* If namep is set, this is set to point to the last alias value resolved,
* even if that module was not loaded. or the module name if no aliases.
* Hence this is always the physical module to load in a chain of aliases.
* Return NULL if the module named is not stored as a structure, or if we were
* resolving aliases and the final module named is not stored as a
* structure.
*/
/**/
static Module
find_module(const char *name, int flags, const char **namep)
{
Module m;
m = (Module)modulestab->getnode2(modulestab, name);
if (m) {
if ((flags & FINDMOD_ALIASP) && (m->node.flags & MOD_ALIAS)) {
if (namep)
*namep = m->u.alias;
return find_module(m->u.alias, flags, namep);
}
if (namep)
*namep = m->node.nam;
return m;
}
if (!(flags & FINDMOD_CREATE))
return NULL;
m = zshcalloc(sizeof(*m));
modulestab->addnode(modulestab, ztrdup(name), m);
return m;
}
/*
* Unlink and free a module node from the linked list.
*/
/**/
static void
delete_module(Module m)
{
modulestab->removenode(modulestab, m->node.nam);
modulestab->freenode(&m->node);
}
/*
* Return 1 if a module is fully loaded else zero.
* A linked module may be marked as unloaded even though
* we can't fully unload it; this returns 0 to try to
* make that state transparently like an unloaded module.
*/
/**/
mod_export int
module_loaded(const char *name)
{
Module m;
return ((m = find_module(name, FINDMOD_ALIASP, NULL)) &&
m->u.handle &&
!(m->node.flags & MOD_UNLOAD));
}
/*
* Setup and cleanup functions: we don't search for aliases here,
* since they should have been resolved before we try to load or unload
* the module.
*/
/**/
#ifdef DYNAMIC
/**/
#ifdef AIXDYNAMIC
/**/
static int
dyn_setup_module(Module m)
{
return ((int (*)_((int,Module, void*))) m->u.handle)(0, m, NULL);
}
/**/
static int
dyn_features_module(Module m, char ***features)
{
return ((int (*)_((int,Module, void*))) m->u.handle)(4, m, features);
}
/**/
static int
dyn_enables_module(Module m, int **enables)
{
return ((int (*)_((int,Module, void*))) m->u.handle)(5, m, enables);
}
/**/
static int
dyn_boot_module(Module m)
{
return ((int (*)_((int,Module, void*))) m->u.handle)(1, m, NULL);
}
/**/
static int
dyn_cleanup_module(Module m)
{
return ((int (*)_((int,Module, void*))) m->u.handle)(2, m, NULL);
}
/**/
static int
dyn_finish_module(Module m)
{
return ((int (*)_((int,Module,void *))) m->u.handle)(3, m, NULL);
}
/**/
#else
static Module_generic_func
module_func(Module m, char *name)
{
#ifdef DYNAMIC_NAME_CLASH_OK
return (Module_generic_func) dlsym(m->u.handle, name);
#else /* !DYNAMIC_NAME_CLASH_OK */
VARARR(char, buf, strlen(name) + strlen(m->node.nam)*2 + 1);
char const *p;
char *q;
strcpy(buf, name);
q = strchr(buf, 0);
for(p = m->node.nam; *p; p++) {
if(*p == '/') {
*q++ = 'Q';
*q++ = 's';
} else if(*p == '_') {
*q++ = 'Q';
*q++ = 'u';
} else if(*p == 'Q') {
*q++ = 'Q';
*q++ = 'q';
} else
*q++ = *p;
}
*q = 0;
return (Module_generic_func) dlsym(m->u.handle, buf);
#endif /* !DYNAMIC_NAME_CLASH_OK */
}
/**/
static int
dyn_setup_module(Module m)
{
Module_void_func fn = (Module_void_func)module_func(m, STR_SETUP);
if (fn)
return fn(m);
zwarnnam(m->node.nam, "no setup function");
return 1;
}
/**/
static int
dyn_features_module(Module m, char ***features)
{
Module_features_func fn =
(Module_features_func)module_func(m, STR_FEATURES);
if (fn)
return fn(m, features);
/* not a user-visible error if no features function */
return 1;
}
/**/
static int
dyn_enables_module(Module m, int **enables)
{
Module_enables_func fn = (Module_enables_func)module_func(m, STR_ENABLES);
if (fn)
return fn(m, enables);
/* not a user-visible error if no enables function */
return 1;
}
/**/
static int
dyn_boot_module(Module m)
{
Module_void_func fn = (Module_void_func)module_func(m, STR_BOOT);
if(fn)
return fn(m);
zwarnnam(m->node.nam, "no boot function");
return 1;
}
/**/
static int
dyn_cleanup_module(Module m)
{
Module_void_func fn = (Module_void_func)module_func(m, STR_CLEANUP);
if(fn)
return fn(m);
zwarnnam(m->node.nam, "no cleanup function");
return 1;
}
/* Note that this function does more than just calling finish_foo(), *
* it really unloads the module. */
/**/
static int
dyn_finish_module(Module m)
{
Module_void_func fn = (Module_void_func)module_func(m, STR_FINISH);
int r;
if (fn)
r = fn(m);
else {
zwarnnam(m->node.nam, "no finish function");
r = 1;
}
dlclose(m->u.handle);
return r;
}
/**/
#endif /* !AIXDYNAMIC */
/**/
static int
setup_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->setup)(m) : dyn_setup_module(m));
}
/**/
static int
features_module(Module m, char ***features)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->features)(m, features) :
dyn_features_module(m, features));
}
/**/
static int
enables_module(Module m, int **enables)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->enables)(m, enables) :
dyn_enables_module(m, enables));
}
/**/
static int
boot_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->boot)(m) : dyn_boot_module(m));
}
/**/
static int
cleanup_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->cleanup)(m) : dyn_cleanup_module(m));
}
/**/
static int
finish_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ?
(m->u.linked->finish)(m) : dyn_finish_module(m));
}
/**/
#else /* !DYNAMIC */
/**/
static int
setup_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->setup)(m) : 1);
}
/**/
static int
features_module(Module m, char ***features)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->features)(m, features)
: 1);
}
/**/
static int
enables_module(Module m, int **enables)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->enables)(m, enables)
: 1);
}
/**/
static int
boot_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->boot)(m) : 1);
}
/**/
static int
cleanup_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->cleanup)(m) : 1);
}
/**/
static int
finish_module(Module m)
{
return ((m->node.flags & MOD_LINKED) ? (m->u.linked->finish)(m) : 1);
}
/**/
#endif /* !DYNAMIC */
/************************************************************************
* Functions called when manipulating modules
************************************************************************/
/*
* Set the features for the module, which must be loaded
* by now (though may not be fully set up).
*
* Return 0 for success, 1 for failure, 2 if some features
* couldn't be set by the module itself (non-existent features
* are tested here and cause 1 to be returned).
*/
/**/
static int
do_module_features(Module m, Feature_enables enablesarr, int flags)
{
char **features;
int ret = 0;
if (features_module(m, &features) == 0) {
/*
* Features are supported. If we were passed
* a NULL array, enable all features, else
* enable only the features listed.
* (This may in principle be an empty array,
* although that's not very pointful.)
*/
int *enables = NULL;
if (enables_module(m, &enables)) {
/* If features are supported, enables should be, too */
if (!(flags & FEAT_IGNORE))
zwarn("error getting enabled features for module `%s'",
m->node.nam);
return 1;
}
if ((flags & FEAT_CHECKAUTO) && m->autoloads) {
/*
* Check autoloads are available. Since these
* have been requested at some other point, they
* don't affect the return status unless something
* in enablesstr doesn't work.
*/
LinkNode an, nextn;
for (an = firstnode(m->autoloads); an; an = nextn) {
char *al = (char *)getdata(an), **ptr;
/* careful, we can delete the current node */
nextn = nextnode(an);
for (ptr = features; *ptr; ptr++)
if (!strcmp(al, *ptr))
break;
if (!*ptr) {
char *arg[2];
if (!(flags & FEAT_IGNORE))
zwarn(
"module `%s' has no such feature: `%s': autoload cancelled",
m->node.nam, al);
/*
* This shouldn't happen, so it's not worth optimising
* the call to autofeatures...
*/
arg[0] = al = dupstring(al);
arg[1] = NULL;
(void)autofeatures(NULL, m->node.nam, arg, 0,
FEAT_IGNORE|FEAT_REMOVE);
/*
* don't want to try to enable *that*...
* expunge it from the enable string.
*/
if (enablesarr) {
Feature_enables fep;
for (fep = enablesarr; fep->str; fep++) {
char *str = fep->str;
if (*str == '+' || *str == '-')
str++;
if (fep->pat ? pattry(fep->pat, al) :
!strcmp(al, str)) {
/* can't enable it after all, so return 1 */
ret = 1;
while (fep->str) {
fep->str = fep[1].str;
fep->pat = fep[1].pat;
fep++;
}
if (!fep->pat)
break;
}
}
}
}
}
}
if (enablesarr) {
Feature_enables fep;
for (fep = enablesarr; fep->str; fep++) {
char **fp, *esp = fep->str;
int on = 1, found = 0;
if (*esp == '+')
esp++;
else if (*esp == '-') {
on = 0;
esp++;
}
for (fp = features; *fp; fp++)
if (fep->pat ? pattry(fep->pat, *fp) : !strcmp(*fp, esp)) {
enables[fp - features] = on;
found++;
if (!fep->pat)
break;
}
if (!found) {
if (!(flags & FEAT_IGNORE))
zwarn(fep->pat ?
"module `%s' has no feature matching: `%s'" :
"module `%s' has no such feature: `%s'",
m->node.nam, esp);
return 1;
}
}
} else {
/*
* Enable all features. This is used when loading
* without using zmodload -F.
*/
int n_features = arrlen(features);
int *ep;
for (ep = enables; n_features--; ep++)
*ep = 1;
}
if (enables_module(m, &enables))
return 2;
} else if (enablesarr) {
if (!(flags & FEAT_IGNORE))
zwarn("module `%s' does not support features", m->node.nam);
return 1;
}
/* Else it doesn't support features but we don't care. */
return ret;
}
/*
* Boot the module, including setting up features.
* As we've only just loaded the module, we don't yet
* know what features it supports, so we get them passed
* as a string.
*
* Returns 0 if OK, 1 if completely failed, 2 if some features
* couldn't be set up.
*/
/**/
static int
do_boot_module(Module m, Feature_enables enablesarr, int silent)
{
int ret = do_module_features(m, enablesarr,
silent ? FEAT_IGNORE|FEAT_CHECKAUTO :
FEAT_CHECKAUTO);
if (ret == 1)
return 1;
if (boot_module(m))
return 1;
return ret;
}
/*
* Cleanup the module.
*/
/**/
static int
do_cleanup_module(Module m)
{
return (m->node.flags & MOD_LINKED) ?
(m->u.linked && m->u.linked->cleanup(m)) :
(m->u.handle && cleanup_module(m));
}
/*
* Test a module name contains only valid characters: those
* allowed in a shell identifier plus slash. Return 1 if so.
*/
/**/
static int
modname_ok(char const *p)
{
do {
p = itype_end(p, IIDENT, 0);
if (!*p)
return 1;
} while(*p++ == '/');
return 0;
}
/*
* High level function to load a module, encapsulating
* all the handling of module functions.
*
* "*enablesstr" is NULL if the caller is not feature-aware;
* then the module should turn on all features. If it
* is not NULL it points to an array of features to be
* turned on. This function is responsible for testing whether
* the module supports those features.
*
* If "silent" is 1, don't issue warnings for errors.
*
* Now returns 0 for success (changed post-4.3.4),
* 1 for complete failure, 2 if some features couldn't be set.
*/
/**/
mod_export int
load_module(char const *name, Feature_enables enablesarr, int silent)
{
Module m;
void *handle = NULL;
Linkedmod linked;
int set, bootret;
if (!modname_ok(name)) {
if (!silent)
zerr("invalid module name `%s'", name);
return 1;
}
/*
* The following function call may alter name to the final name in a
* chain of aliases. This makes sure the actual module loaded
* is the right one.
*/
queue_signals();
if (!(m = find_module(name, FINDMOD_ALIASP, &name))) {
if (!(linked = module_linked(name)) &&
!(handle = do_load_module(name, silent))) {
unqueue_signals();
return 1;
}
m = zshcalloc(sizeof(*m));
if (handle) {
m->u.handle = handle;
m->node.flags |= MOD_SETUP;
} else {
m->u.linked = linked;
m->node.flags |= MOD_SETUP | MOD_LINKED;
}
modulestab->addnode(modulestab, ztrdup(name), m);
if ((set = setup_module(m)) ||
(bootret = do_boot_module(m, enablesarr, silent)) == 1) {
if (!set)
do_cleanup_module(m);
finish_module(m);
delete_module(m);
unqueue_signals();
return 1;
}
m->node.flags |= MOD_INIT_S | MOD_INIT_B;
m->node.flags &= ~MOD_SETUP;
unqueue_signals();
return bootret;
}
if (m->node.flags & MOD_SETUP) {
unqueue_signals();
return 0;
}
if (m->node.flags & MOD_UNLOAD)
m->node.flags &= ~MOD_UNLOAD;
else if ((m->node.flags & MOD_LINKED) ? m->u.linked : m->u.handle) {
unqueue_signals();
return 0;
}
if (m->node.flags & MOD_BUSY) {
unqueue_signals();
zerr("circular dependencies for module ;%s", name);
return 1;
}
m->node.flags |= MOD_BUSY;
/*
* TODO: shouldn't we unload the module if one of
* its dependencies fails?
*/
if (m->deps) {
LinkNode n;
for (n = firstnode(m->deps); n; incnode(n))
if (load_module((char *) getdata(n), NULL, silent) == 1) {
m->node.flags &= ~MOD_BUSY;
unqueue_signals();
return 1;
}
}
m->node.flags &= ~MOD_BUSY;
if (!m->u.handle) {
handle = NULL;
if (!(linked = module_linked(name)) &&
!(handle = do_load_module(name, silent))) {
unqueue_signals();
return 1;
}
if (handle) {
m->u.handle = handle;
m->node.flags |= MOD_SETUP;
} else {
m->u.linked = linked;
m->node.flags |= MOD_SETUP | MOD_LINKED;
}
if (setup_module(m)) {
finish_module(m);
if (handle)
m->u.handle = NULL;
else
m->u.linked = NULL;
m->node.flags &= ~MOD_SETUP;
unqueue_signals();
return 1;
}
m->node.flags |= MOD_INIT_S;
}
m->node.flags |= MOD_SETUP;
if ((bootret = do_boot_module(m, enablesarr, silent)) == 1) {
do_cleanup_module(m);
finish_module(m);
if (m->node.flags & MOD_LINKED)
m->u.linked = NULL;
else
m->u.handle = NULL;
m->node.flags &= ~MOD_SETUP;
unqueue_signals();
return 1;
}
m->node.flags |= MOD_INIT_B;
m->node.flags &= ~MOD_SETUP;
unqueue_signals();
return bootret;
}
/* This ensures that the module with the name given as the first argument
* is loaded.
* The other argument is the array of features to set. If this is NULL
* all features are enabled (even if the module was already loaded).
*
* If this is non-NULL the module features are set accordingly
* whether or not the module is loaded; it is an error if the
* module does not support the features passed (even if the feature
* is to be turned off) or if the module does not support features
* at all.
* The return value is 0 if the module was found or loaded
* (this changed post-4.3.4, because I got so confused---pws),
* 1 if loading failed completely, 2 if some features couldn't be set.
*
* This function behaves like load_module() except that it
* handles the case where the module was already loaded, and
* sets features accordingly.
*/
/**/
mod_export int
require_module(const char *module, Feature_enables features, int silent)
{
Module m = NULL;
int ret = 0;
/* Resolve aliases and actual loadable module as for load_module */
queue_signals();
m = find_module(module, FINDMOD_ALIASP, &module);
if (!m || !m->u.handle ||
(m->node.flags & MOD_UNLOAD))
ret = load_module(module, features, silent);
else
ret = do_module_features(m, features, 0);
unqueue_signals();
return ret;
}
/*
* Indicate that the module named "name" depends on the module
* named "from".
*/
/**/
void
add_dep(const char *name, char *from)
{
LinkNode node;
Module m;
/*
* If we were passed an alias, we must resolve it to a final
* module name (and maybe add the corresponding struct), since otherwise
* we would need to check all modules to see if they happen
* to be aliased to the same thing to implement dependencies properly.
*
* This should mean that an attempt to add an alias which would
* have the same name as a module which has dependencies is correctly
* rejected, because then the module named already exists as a non-alias.
* Better make sure. (There's no problem making a an alias which
* *points* to a module with dependencies, of course.)
*/
m = find_module(name, FINDMOD_ALIASP|FINDMOD_CREATE, &name);
if (!m->deps)
m->deps = znewlinklist();
for (node = firstnode(m->deps);
node && strcmp((char *) getdata(node), from);
incnode(node));
if (!node)
zaddlinknode(m->deps, ztrdup(from));
}
/*
* Function to be used when scanning the builtins table to
* find and print autoloadable builtins.
*/
/**/
static void
autoloadscan(HashNode hn, int printflags)
{
Builtin bn = (Builtin) hn;
if(bn->node.flags & BINF_ADDED)
return;
if(printflags & PRINT_LIST) {
fputs("zmodload -ab ", stdout);
if(bn->optstr[0] == '-')
fputs("-- ", stdout);
quotedzputs(bn->optstr, stdout);
if(strcmp(bn->node.nam, bn->optstr)) {
putchar(' ');
quotedzputs(bn->node.nam, stdout);
}
} else {
nicezputs(bn->node.nam, stdout);
if(strcmp(bn->node.nam, bn->optstr)) {
fputs(" (", stdout);
nicezputs(bn->optstr, stdout);
putchar(')');
}
}
putchar('\n');
}
/************************************************************************
* Handling for the zmodload builtin and its various options.
************************************************************************/
/*
* Main builtin entry point for zmodload.
*/
/**/
int
bin_zmodload(char *nam, char **args, Options ops, UNUSED(int func))
{
int ops_bcpf = OPT_ISSET(ops,'b') || OPT_ISSET(ops,'c') ||
OPT_ISSET(ops,'p') || OPT_ISSET(ops,'f');
int ops_au = OPT_ISSET(ops,'a') || OPT_ISSET(ops,'u');
int ret = 1, autoopts;
/* options only allowed with -F */
char *fonly = "lP", *fp;
if (ops_bcpf && !ops_au) {
zwarnnam(nam, "-b, -c, -f, and -p must be combined with -a or -u");
return 1;
}
if (OPT_ISSET(ops,'F') && (ops_bcpf || OPT_ISSET(ops,'u'))) {
zwarnnam(nam, "-b, -c, -f, -p and -u cannot be combined with -F");
return 1;
}
if (OPT_ISSET(ops,'A') || OPT_ISSET(ops,'R')) {
if (ops_bcpf || ops_au || OPT_ISSET(ops,'d') ||
(OPT_ISSET(ops,'R') && OPT_ISSET(ops,'e'))) {
zwarnnam(nam, "illegal flags combined with -A or -R");
return 1;
}
if (!OPT_ISSET(ops,'e'))
return bin_zmodload_alias(nam, args, ops);
}
if (OPT_ISSET(ops,'d') && OPT_ISSET(ops,'a')) {
zwarnnam(nam, "-d cannot be combined with -a");
return 1;
}
if (OPT_ISSET(ops,'u') && !*args) {
zwarnnam(nam, "what do you want to unload?");
return 1;
}
if (OPT_ISSET(ops,'e') && (OPT_ISSET(ops,'I') || OPT_ISSET(ops,'L') ||
(OPT_ISSET(ops,'a') && !OPT_ISSET(ops,'F'))
|| OPT_ISSET(ops,'d') ||
OPT_ISSET(ops,'i') || OPT_ISSET(ops,'u'))) {
zwarnnam(nam, "-e cannot be combined with other options");
/* except -F ... */
return 1;
}
for (fp = fonly; *fp; fp++) {
if (OPT_ISSET(ops,STOUC(*fp)) && !OPT_ISSET(ops,'F')) {
zwarnnam(nam, "-%c is only allowed with -F", *fp);
return 1;
}
}
queue_signals();
if (OPT_ISSET(ops, 'F'))
ret = bin_zmodload_features(nam, args, ops);
else if (OPT_ISSET(ops,'e'))
ret = bin_zmodload_exist(nam, args, ops);
else if (OPT_ISSET(ops,'d'))
ret = bin_zmodload_dep(nam, args, ops);
else if ((autoopts = OPT_ISSET(ops, 'b') + OPT_ISSET(ops, 'c') +
OPT_ISSET(ops, 'p') + OPT_ISSET(ops, 'f')) ||
/* zmodload -a is equivalent to zmodload -ab, annoyingly */
OPT_ISSET(ops, 'a')) {
if (autoopts > 1) {
zwarnnam(nam, "use only one of -b, -c, or -p");
ret = 1;
} else
ret = bin_zmodload_auto(nam, args, ops);
} else
ret = bin_zmodload_load(nam, args, ops);
unqueue_signals();
return ret;
}
/* zmodload -A */
/**/
static int
bin_zmodload_alias(char *nam, char **args, Options ops)
{
/*
* TODO: while it would be too nasty to have aliases, as opposed
* to real loadable modules, with dependencies --- just what would
* we need to load when, exactly? --- there is in principle no objection
* to making it possible to force an alias onto an existing unloaded
* module which has dependencies. This would simply transfer
* the dependencies down the line to the aliased-to module name.
* This is actually useful, since then you can alias zsh/zle=mytestzle
* to load another version of zle. But then what happens when the
* alias is removed? Do you transfer the dependencies back? And
* suppose other names are aliased to the same file? It might be
* kettle of fish best left unwormed.
*/
Module m;
if (!*args) {
if (OPT_ISSET(ops,'R')) {
zwarnnam(nam, "no module alias to remove");
return 1;
}
scanhashtable(modulestab, 1, MOD_ALIAS, 0,
modulestab->printnode,
OPT_ISSET(ops,'L') ? PRINTMOD_LIST : 0);
return 0;
}
for (; *args; args++) {
char *eqpos = strchr(*args, '=');
char *aliasname = eqpos ? eqpos+1 : NULL;
if (eqpos)
*eqpos = '\0';
if (!modname_ok(*args)) {
zwarnnam(nam, "invalid module name `%s'", *args);
return 1;
}
if (OPT_ISSET(ops,'R')) {
if (aliasname) {
zwarnnam(nam, "bad syntax for removing module alias: %s",
*args);
return 1;
}
m = find_module(*args, 0, NULL);
if (m) {
if (!(m->node.flags & MOD_ALIAS)) {
zwarnnam(nam, "module is not an alias: %s", *args);
return 1;
}
delete_module(m);
} else {
zwarnnam(nam, "no such module alias: %s", *args);
return 1;
}
} else {
if (aliasname) {
const char *mname = aliasname;
if (!modname_ok(aliasname)) {
zwarnnam(nam, "invalid module name `%s'", aliasname);
return 1;
}
do {
if (!strcmp(mname, *args)) {
zwarnnam(nam, "module alias would refer to itself: %s",
*args);
return 1;
}
} while ((m = find_module(mname, 0, NULL))
&& (m->node.flags & MOD_ALIAS)
&& (mname = m->u.alias));
m = find_module(*args, 0, NULL);
if (m) {
if (!(m->node.flags & MOD_ALIAS)) {
zwarnnam(nam, "module is not an alias: %s", *args);
return 1;
}
zsfree(m->u.alias);
} else {
m = (Module) zshcalloc(sizeof(*m));
m->node.flags = MOD_ALIAS;
modulestab->addnode(modulestab, ztrdup(*args), m);
}
m->u.alias = ztrdup(aliasname);
} else {
if ((m = find_module(*args, 0, NULL))) {
if (m->node.flags & MOD_ALIAS)
modulestab->printnode(&m->node,
OPT_ISSET(ops,'L') ?
PRINTMOD_LIST : 0);
else {
zwarnnam(nam, "module is not an alias: %s", *args);
return 1;
}
} else {
zwarnnam(nam, "no such module alias: %s", *args);
return 1;
}
}
}
}
return 0;
}
/* zmodload -e (without -F) */
/**/
static int
bin_zmodload_exist(UNUSED(char *nam), char **args, Options ops)
{
Module m;
if (!*args) {
scanhashtable(modulestab, 1, 0, 0, modulestab->printnode,
OPT_ISSET(ops,'A') ? PRINTMOD_EXIST|PRINTMOD_ALIAS :
PRINTMOD_EXIST);
return 0;
} else {
int ret = 0;
for (; !ret && *args; args++) {
if (!(m = find_module(*args, FINDMOD_ALIASP, NULL))
|| !m->u.handle
|| (m->node.flags & MOD_UNLOAD))
ret = 1;
}
return ret;
}
}
/* zmodload -d */
/**/
static int
bin_zmodload_dep(UNUSED(char *nam), char **args, Options ops)
{
Module m;
if (OPT_ISSET(ops,'u')) {
/* remove dependencies, which can't pertain to aliases */
const char *tnam = *args++;
m = find_module(tnam, FINDMOD_ALIASP, &tnam);
if (!m)
return 0;
if (*args && m->deps) {
do {
LinkNode dnode;
for (dnode = firstnode(m->deps); dnode; incnode(dnode))
if (!strcmp(*args, getdata(dnode))) {
zsfree(getdata(dnode));
remnode(m->deps, dnode);
break;
}
} while(*++args);
if (empty(m->deps)) {
freelinklist(m->deps, freestr);
m->deps = NULL;
}
} else {
if (m->deps) {
freelinklist(m->deps, freestr);
m->deps = NULL;
}
}
if (!m->deps && !m->u.handle)
delete_module(m);
return 0;
} else if (!args[0] || !args[1]) {
/* list dependencies */
int depflags = OPT_ISSET(ops,'L') ?
PRINTMOD_DEPS|PRINTMOD_LIST : PRINTMOD_DEPS;
if (args[0]) {
if ((m = (Module)modulestab->getnode2(modulestab, args[0])))
modulestab->printnode(&m->node, depflags);
} else {
scanhashtable(modulestab, 1, 0, 0, modulestab->printnode,
depflags);
}
return 0;
} else {
/* add dependencies */
int ret = 0;
char *tnam = *args++;
for (; *args; args++)
add_dep(tnam, *args);
return ret;
}
}
/*
* Function for scanning the parameter table to find and print
* out autoloadable parameters.
*/
static void
printautoparams(HashNode hn, int lon)
{
Param pm = (Param) hn;
if (pm->node.flags & PM_AUTOLOAD) {
if (lon)
printf("zmodload -ap %s %s\n", pm->u.str, pm->node.nam);
else
printf("%s (%s)\n", pm->node.nam, pm->u.str);
}
}
/* zmodload -a/u [bcpf] */
/**/
static int
bin_zmodload_auto(char *nam, char **args, Options ops)
{
int fchar, flags;
char *modnam;
if (OPT_ISSET(ops,'c')) {
if (!*args) {
/* list autoloaded conditions */
Conddef p;
for (p = condtab; p; p = p->next) {
if (p->module) {
if (OPT_ISSET(ops,'L')) {
fputs("zmodload -ac", stdout);
if (p->flags & CONDF_INFIX)
putchar('I');
printf(" %s %s\n", p->module, p->name);
} else {
if (p->flags & CONDF_INFIX)
fputs("infix ", stdout);
else
fputs("post ", stdout);
printf("%s (%s)\n",p->name, p->module);
}
}
}
return 0;
}
fchar = OPT_ISSET(ops,'I') ? 'C' : 'c';
} else if (OPT_ISSET(ops,'p')) {
if (!*args) {
/* list autoloaded parameters */
scanhashtable(paramtab, 1, 0, 0, printautoparams,
OPT_ISSET(ops,'L'));
return 0;
}
fchar = 'p';
} else if (OPT_ISSET(ops,'f')) {
if (!*args) {
/* list autoloaded math functions */
MathFunc p;
for (p = mathfuncs; p; p = p->next) {
if (!(p->flags & MFF_USERFUNC) && p->module) {
if (OPT_ISSET(ops,'L')) {
fputs("zmodload -af", stdout);
printf(" %s %s\n", p->module, p->name);
} else
printf("%s (%s)\n",p->name, p->module);
}
}
return 0;
}
fchar = 'f';
} else {
/* builtins are the default; zmodload -ab or just zmodload -a */
if (!*args) {
/* list autoloaded builtins */
scanhashtable(builtintab, 1, 0, 0,
autoloadscan, OPT_ISSET(ops,'L') ? PRINT_LIST : 0);
return 0;
}
fchar = 'b';
}
flags = FEAT_AUTOALL;
if (OPT_ISSET(ops,'i'))
flags |= FEAT_IGNORE;
if (OPT_ISSET(ops,'u')) {
/* remove autoload */
flags |= FEAT_REMOVE;
modnam = NULL;
} else {
/* add autoload */
modnam = *args;
if (args[1])
args++;
}
return autofeatures(nam, modnam, args, fchar, flags);
}
/* Backend handler for zmodload -u */
/**/
int
unload_module(Module m)
{
int del;
/*
* Only unload the real module, so resolve aliases.
*/
if (m->node.flags & MOD_ALIAS) {
m = find_module(m->u.alias, FINDMOD_ALIASP, NULL);
if (!m)
return 1;
}
/*
* We may need to clean up the module any time setup_ has been
* called. After cleanup_ is successful we are no longer in the
* booted state (because features etc. are deregistered), so remove
* MOD_INIT_B, and also MOD_INIT_S since we won't need to cleanup
* again if this succeeded.
*/
if ((m->node.flags & MOD_INIT_S) &&
!(m->node.flags & MOD_UNLOAD) &&
do_cleanup_module(m))
return 1;
m->node.flags &= ~(MOD_INIT_B|MOD_INIT_S);
del = (m->node.flags & MOD_UNLOAD);
if (m->wrapper) {
m->node.flags |= MOD_UNLOAD;
return 0;
}
m->node.flags &= ~MOD_UNLOAD;
/*
* We always need to finish the module (and unload it)
* if it is present.
*/
if (m->node.flags & MOD_LINKED) {
if (m->u.linked) {
m->u.linked->finish(m);
m->u.linked = NULL;
}
} else {
if (m->u.handle) {
finish_module(m);
m->u.handle = NULL;
}
}
if (del && m->deps) {
/* The module was unloaded delayed, unload all modules *
* on which it depended. */
LinkNode n;
for (n = firstnode(m->deps); n; incnode(n)) {
Module dm = find_module((char *) getdata(n),
FINDMOD_ALIASP, NULL);
if (dm &&
(dm->node.flags & MOD_UNLOAD)) {
/* See if this is the only module depending on it. */
Module am;
int du = 1, i;
/* Scan hash table the hard way */
for (i = 0; du && i < modulestab->hsize; i++) {
for (am = (Module)modulestab->nodes[i]; du && am;
am = (Module)am->node.next) {
LinkNode sn;
/*
* Don't scan the module we're unloading;
* ignore if no dependencies.
*/
if (am == m || !am->deps)
continue;
/* Don't scan if not loaded nor linked */
if ((am->node.flags & MOD_LINKED) ?
!am->u.linked : !am->u.handle)
continue;
for (sn = firstnode(am->deps); du && sn;
incnode(sn)) {
if (!strcmp((char *) getdata(sn),
dm->node.nam))
du = 0;
}
}
}
if (du)
unload_module(dm);
}
}
}
if (m->autoloads && firstnode(m->autoloads)) {
/*
* Module has autoloadable features. Restore them
* so that the module will be reloaded when needed.
*/
autofeatures("zsh", m->node.nam,
hlinklist2array(m->autoloads, 0), 0, FEAT_IGNORE);
} else if (!m->deps) {
delete_module(m);
}
return 0;
}
/*
* Unload a module by name (modname); nam is the command name.
* Optionally don't print some error messages (always print
* dependency errors).
*/
/**/
int
unload_named_module(char *modname, char *nam, int silent)
{
const char *mname;
Module m;
int ret = 0;
m = find_module(modname, FINDMOD_ALIASP, &mname);
if (m) {
int i, del = 0;
Module dm;
for (i = 0; i < modulestab->hsize; i++) {
for (dm = (Module)modulestab->nodes[i]; dm;
dm = (Module)dm->node.next) {
LinkNode dn;
if (!dm->deps || !dm->u.handle)
continue;
for (dn = firstnode(dm->deps); dn; incnode(dn)) {
if (!strcmp((char *) getdata(dn), mname)) {
if (dm->node.flags & MOD_UNLOAD)
del = 1;
else {
zwarnnam(nam, "module %s is in use by another module and cannot be unloaded", mname);
return 1;
}
}
}
}
}
if (del)
m->wrapper++;
if (unload_module(m))
ret = 1;
if (del)
m->wrapper--;
} else if (!silent) {
zwarnnam(nam, "no such module %s", modname);
ret = 1;
}
return ret;
}
/* zmodload -u without -d */
/**/
static int
bin_zmodload_load(char *nam, char **args, Options ops)
{
int ret = 0;
if(OPT_ISSET(ops,'u')) {
/* unload modules */
for(; *args; args++) {
if (unload_named_module(*args, nam, OPT_ISSET(ops,'i')))
ret = 1;
}
return ret;
} else if(!*args) {
/* list modules */
scanhashtable(modulestab, 1, 0, MOD_UNLOAD|MOD_ALIAS,
modulestab->printnode,
OPT_ISSET(ops,'L') ? PRINTMOD_LIST : 0);
return 0;
} else {
/* load modules */
for (; *args; args++) {
int tmpret = require_module(*args, NULL, OPT_ISSET(ops,'s'));
if (tmpret && ret != 1)
ret = tmpret;
}
return ret;
}
}
/* zmodload -F */
/**/
static int
bin_zmodload_features(const char *nam, char **args, Options ops)
{
int iarg;
char *modname = *args;
Patprog *patprogs;
Feature_enables features, fep;
if (modname)
args++;
else if (OPT_ISSET(ops,'L')) {
int printflags = PRINTMOD_LIST|PRINTMOD_FEATURES;
if (OPT_ISSET(ops,'P')) {
zwarnnam(nam, "-P is only allowed with a module name");
return 1;
}
if (OPT_ISSET(ops,'l'))
printflags |= PRINTMOD_LISTALL;
if (OPT_ISSET(ops,'a'))
printflags |= PRINTMOD_AUTO;
scanhashtable(modulestab, 1, 0, MOD_ALIAS,
modulestab->printnode, printflags);
return 0;
}
if (!modname) {
zwarnnam(nam, "-F requires a module name");
return 1;
}
if (OPT_ISSET(ops,'m')) {
char **argp;
Patprog *patprogp;
/* not NULL terminated */
patprogp = patprogs =
(Patprog *)zhalloc(arrlen(args)*sizeof(Patprog));
for (argp = args; *argp; argp++, patprogp++) {
char *arg = *argp;
if (*arg == '+' || *arg == '-')
arg++;
tokenize(arg);
*patprogp = patcompile(arg, 0, 0);
}
} else
patprogs = NULL;
if (OPT_ISSET(ops,'l') || OPT_ISSET(ops,'L') || OPT_ISSET(ops,'e')) {
/*
* With option 'l', list all features one per line with + or -.
* With option 'L', list as zmodload statement showing
* only options turned on.
* With both options, list as zmodload showing options
* to be turned both on and off.
*/
Module m;
char **features, **fp, **arrset = NULL, **arrp = NULL;
int *enables = NULL, *ep;
char *param = OPT_ARG_SAFE(ops,'P');
m = find_module(modname, FINDMOD_ALIASP, NULL);
if (OPT_ISSET(ops,'a')) {
LinkNode ln;
/*
* If there are no autoloads defined, return status 1.
*/
if (!m || !m->autoloads)
return 1;
if (OPT_ISSET(ops,'e')) {
for (fp = args; *fp; fp++) {
char *fstr = *fp;
int sense = 1;
if (*fstr == '+')
fstr++;
else if (*fstr == '-') {
fstr++;
sense = 0;
}
if ((linknodebystring(m->autoloads, fstr) != NULL) !=
sense)
return 1;
}
return 0;
}
if (param) {
arrp = arrset = (char **)zalloc(sizeof(char*) *
(countlinknodes(m->autoloads)+1));
} else if (OPT_ISSET(ops,'L')) {
printf("zmodload -aF %s%c", m->node.nam,
m->autoloads && firstnode(m->autoloads) ? ' ' : '\n');
arrp = NULL;
}
for (ln = firstnode(m->autoloads); ln; incnode(ln)) {
char *al = (char *)getdata(ln);
if (param)
*arrp++ = ztrdup(al);
else
printf("%s%c", al,
OPT_ISSET(ops,'L') && nextnode(ln) ? ' ' : '\n');
}
if (param) {
*arrp = NULL;
if (!setaparam(param, arrset))
return 1;
}
return 0;
}
if (!m || !m->u.handle || (m->node.flags & MOD_UNLOAD)) {
if (!OPT_ISSET(ops,'e'))
zwarnnam(nam, "module `%s' is not yet loaded", modname);
return 1;
}
if (features_module(m, &features)) {
if (!OPT_ISSET(ops,'e'))
zwarnnam(nam, "module `%s' does not support features",
m->node.nam);
return 1;
}
if (enables_module(m, &enables)) {
/* this shouldn't ever happen, so don't silence this error */
zwarnnam(nam, "error getting enabled features for module `%s'",
m->node.nam);
return 1;
}
for (arrp = args, iarg = 0; *arrp; arrp++, iarg++) {
char *arg = *arrp;
int on, found = 0;
if (*arg == '-') {
on = 0;
arg++;
} else if (*arg == '+') {
on = 1;
arg++;
} else
on = -1;
for (fp = features, ep = enables; *fp; fp++, ep++) {
if (patprogs ? pattry(patprogs[iarg], *fp) :
!strcmp(arg, *fp)) {
/* for -e, check given state, if any */
if (OPT_ISSET(ops,'e') && on != -1 &&
on != (*ep & 1))
return 1;
found++;
if (!patprogs)
break;
}
}
if (!found) {
if (!OPT_ISSET(ops,'e'))
zwarnnam(nam, patprogs ?
"module `%s' has no feature matching: `%s'" :
"module `%s' has no such feature: `%s'",
modname, *arrp);
return 1;
}
}
if (OPT_ISSET(ops,'e')) /* yep, everything we want exists */
return 0;
if (param) {
int arrlen = 0;
for (fp = features, ep = enables; *fp; fp++, ep++) {
if (OPT_ISSET(ops, 'L') && !OPT_ISSET(ops, 'l') &&
!*ep)
continue;
if (*args) {
char **argp;
for (argp = args, iarg = 0; *argp; argp++, iarg++) {
char *arg = *argp;
/* ignore +/- for consistency */
if (*arg == '+' || *arg == '-')
arg++;
if (patprogs ? pattry(patprogs[iarg], *fp) :
!strcmp(*fp, arg))
break;
}
if (!*argp)
continue;
}
arrlen++;
}
arrp = arrset = zalloc(sizeof(char *) * (arrlen+1));
} else if (OPT_ISSET(ops, 'L'))
printf("zmodload -F %s ", m->node.nam);
for (fp = features, ep = enables; *fp; fp++, ep++) {
char *onoff;
int term;
if (*args) {
char **argp;
for (argp = args, iarg = 0; *argp; argp++, iarg++) {
char *arg = *argp;
if (*arg == '+' || *arg == '-')
arg++;
if (patprogs ? pattry(patprogs[iarg], *fp) :
!strcmp(*fp, *argp))
break;
}
if (!*argp)
continue;
}
if (OPT_ISSET(ops, 'L') && !OPT_ISSET(ops, 'l')) {
if (!*ep)
continue;
onoff = "";
} else if (*ep) {
onoff = "+";
} else {
onoff = "-";
}
if (param) {
*arrp++ = bicat(onoff, *fp);
} else {
if (OPT_ISSET(ops, 'L') && fp[1]) {
term = ' ';
} else {
term = '\n';
}
printf("%s%s%c", onoff, *fp, term);
}
}
if (param) {
*arrp = NULL;
if (!setaparam(param, arrset))
return 1;
}
return 0;
} else if (OPT_ISSET(ops,'P')) {
zwarnnam(nam, "-P can only be used with -l or -L");
return 1;
} else if (OPT_ISSET(ops,'a')) {
if (OPT_ISSET(ops,'m')) {
zwarnnam(nam, "-m cannot be used with -a");
return 1;
}
/*
* With zmodload -aF, we always use the effect of -i.
* The thinking is that marking a feature for
* autoload is separate from enabling or disabling it.
* Arguably we could do this with the zmodload -ab method
* but I've kept it there for old time's sake.
* The decoupling has meant FEAT_IGNORE/-i also
* suppresses an error for attempting to remove an
* autoload when the feature is enabled, which used
* to be a hard error before.
*/
return autofeatures(nam, modname, args, 0, FEAT_IGNORE);
}
fep = features =
(Feature_enables)zhalloc((arrlen(args)+1)*sizeof(*fep));
while (*args) {
fep->str = *args++;
fep->pat = patprogs ? *patprogs++ : NULL;
fep++;
}
fep->str = NULL;
fep->pat = NULL;
return require_module(modname, features, OPT_ISSET(ops,'s'));
}
/************************************************************************
* Generic feature support.
* These functions are designed to be called by modules.
************************************************************************/
/*
* Construct a features array out of the list of concrete
* features given, leaving space for any abstract features
* to be added by the module itself.
*
* Note the memory is from the heap.
*/
/**/
mod_export char **
featuresarray(UNUSED(Module m), Features f)
{
int bn_size = f->bn_size, cd_size = f->cd_size;
int mf_size = f->mf_size, pd_size = f->pd_size;
int features_size = bn_size + cd_size + pd_size + mf_size + f->n_abstract;
Builtin bnp = f->bn_list;
Conddef cdp = f->cd_list;
MathFunc mfp = f->mf_list;
Paramdef pdp = f->pd_list;
char **features = (char **)zhalloc((features_size + 1) * sizeof(char *));
char **featurep = features;
while (bn_size--)
*featurep++ = dyncat("b:", (bnp++)->node.nam);
while (cd_size--) {
*featurep++ = dyncat((cdp->flags & CONDF_INFIX) ? "C:" : "c:",
cdp->name);
cdp++;
}
while (mf_size--)
*featurep++ = dyncat("f:", (mfp++)->name);
while (pd_size--)
*featurep++ = dyncat("p:", (pdp++)->name);
features[features_size] = NULL;
return features;
}
/*
* Return the current set of enables for the features in a
* module using heap memory. Leave space for abstract
* features. The array is not zero terminated.
*/
/**/
mod_export int *
getfeatureenables(UNUSED(Module m), Features f)
{
int bn_size = f->bn_size, cd_size = f->cd_size;
int mf_size = f->mf_size, pd_size = f->pd_size;
int features_size = bn_size + cd_size + mf_size + pd_size + f->n_abstract;
Builtin bnp = f->bn_list;
Conddef cdp = f->cd_list;
MathFunc mfp = f->mf_list;
Paramdef pdp = f->pd_list;
int *enables = zhalloc(sizeof(int) * features_size);
int *enablep = enables;
while (bn_size--)
*enablep++ = ((bnp++)->node.flags & BINF_ADDED) ? 1 : 0;
while (cd_size--)
*enablep++ = ((cdp++)->flags & CONDF_ADDED) ? 1 : 0;
while (mf_size--)
*enablep++ = ((mfp++)->flags & MFF_ADDED) ? 1 : 0;
while (pd_size--)
*enablep++ = (pdp++)->pm ? 1 : 0;
return enables;
}
/*
* Add or remove the concrete features passed in arguments,
* depending on the corresponding element of the array e.
* If e is NULL, disable everything.
* Return 0 for success, 1 for failure; does not attempt
* to imitate the return values of addbuiltins() etc.
* Any failure in adding a requested feature is an
* error.
*/
/**/
mod_export int
setfeatureenables(Module m, Features f, int *e)
{
int ret = 0;
if (f->bn_size) {
if (setbuiltins(m->node.nam, f->bn_list, f->bn_size, e))
ret = 1;
if (e)
e += f->bn_size;
}
if (f->cd_size) {
if (setconddefs(m->node.nam, f->cd_list, f->cd_size, e))
ret = 1;
if (e)
e += f->cd_size;
}
if (f->mf_size) {
if (setmathfuncs(m->node.nam, f->mf_list, f->mf_size, e))
ret = 1;
if (e)
e += f->mf_size;
}
if (f->pd_size) {
if (setparamdefs(m->node.nam, f->pd_list, f->pd_size, e))
ret = 1;
if (e)
e += f->pd_size;
}
return ret;
}
/*
* Convenient front-end to get or set features which
* can be used in a module enables_() function.
*/
/**/
mod_export int
handlefeatures(Module m, Features f, int **enables)
{
if (!enables || *enables)
return setfeatureenables(m, f, enables ? *enables : NULL);
*enables = getfeatureenables(m, f);
return 0;
}
/*
* Ensure module "modname" is providing feature with "prefix"
* and "feature" (e.g. "b:", "limit"). If feature is NULL,
* ensure all features are loaded (used for compatibility
* with the pre-feature autoloading behaviour).
*
* This will usually be called from the main shell to handle
* loading of an autoloadable feature.
*
* Returns 0 on success, 1 for error in module, 2 for error
* setting the feature. However, this isn't actually all
* that useful for testing immediately on an autoload since
* it could be a failure to autoload a different feature
* from the one we want. We could fix this but it's
* possible to test other ways.
*/
/**/
mod_export int
ensurefeature(const char *modname, const char *prefix, const char *feature)
{
char *f;
struct feature_enables features[2];
if (!feature)
return require_module(modname, NULL, 0);
f = dyncat(prefix, feature);
features[0].str = f;
features[0].pat = NULL;
features[1].str = NULL;
features[1].pat = NULL;
return require_module(modname, features, 0);
}
/*
* Add autoloadable features for a given module.
*/
/**/
int
autofeatures(const char *cmdnam, const char *module, char **features,
int prefchar, int defflags)
{
int ret = 0, subret;
Module defm, m;
char **modfeatures = NULL;
int *modenables = NULL;
if (module) {
defm = (Module)find_module(module,
FINDMOD_ALIASP|FINDMOD_CREATE, NULL);
if ((defm->node.flags & MOD_LINKED) ? defm->u.linked :
defm->u.handle) {
(void)features_module(defm, &modfeatures);
(void)enables_module(defm, &modenables);
}
} else
defm = NULL;
for (; *features; features++) {
char *fnam, *typnam, *feature;
int add, fchar, flags = defflags;
autofeaturefn_t fn;
if (prefchar) {
/*
* "features" is list of bare features with no
* type prefix; prefchar gives type character.
*/
add = 1; /* unless overridden by flag */
fchar = prefchar;
fnam = *features;
feature = zhalloc(strlen(fnam) + 3);
sprintf(feature, "%c:%s", fchar, fnam);
} else {
feature = *features;
if (*feature == '-') {
add = 0;
feature++;
} else {
add = 1;
if (*feature == '+')
feature++;
}
if (!*feature || feature[1] != ':') {
zwarnnam(cmdnam, "bad format for autoloadable feature: `%s'",
feature);
ret = 1;
continue;
}
fnam = feature + 2;
fchar = feature[0];
}
if (flags & FEAT_REMOVE)
add = 0;
switch (fchar) {
case 'b':
fn = add ? add_autobin : del_autobin;
typnam = "builtin";
break;
case 'C':
flags |= FEAT_INFIX;
/* FALLTHROUGH */
case 'c':
fn = add ? add_autocond : del_autocond;
typnam = "condition";
break;
case 'f':
fn = add ? add_automathfunc : del_automathfunc;
typnam = "math function";
break;
case 'p':
fn = add ? add_autoparam : del_autoparam;
typnam = "parameter";
break;
default:
zwarnnam(cmdnam, "bad autoloadable feature type: `%c'",
fchar);
ret = 1;
continue;
}
if (strchr(fnam, '/')) {
zwarnnam(cmdnam, "%s: `/' is illegal in a %s", fnam, typnam);
ret = 1;
continue;
}
if (!module) {
/*
* Traditional un-autoload syntax doesn't tell us
* which module this came from.
*/
int i;
for (i = 0, m = NULL; !m && i < modulestab->hsize; i++) {
for (m = (Module)modulestab->nodes[i]; m;
m = (Module)m->node.next) {
if (m->autoloads &&
linknodebystring(m->autoloads, feature))
break;
}
}
if (!m) {
if (!(flags & FEAT_IGNORE)) {
ret = 1;
zwarnnam(cmdnam, "%s: no such %s", fnam, typnam);
}
continue;
}
} else
m = defm;
subret = 0;
if (add) {
char **ptr;
if (modfeatures) {
/*
* If the module is already available, check that
* it does in fact provide the necessary feature.
*/
for (ptr = modfeatures; *ptr; ptr++)
if (!strcmp(*ptr, feature))
break;
if (!*ptr) {
zwarnnam(cmdnam, "module `%s' has no such feature: `%s'",
m->node.nam, feature);
ret = 1;
continue;
}
/*
* If the feature is already provided by the module, there's
* nothing more to do.
*/
if (modenables[ptr-modfeatures])
continue;
/*
* Otherwise, marking it for autoload will do the
* right thing when the feature is eventually used.
*/
}
if (!m->autoloads) {
m->autoloads = znewlinklist();
zaddlinknode(m->autoloads, ztrdup(feature));
} else {
/* Insert in lexical order */
LinkNode ln, prev = (LinkNode)m->autoloads;
while ((ln = nextnode(prev))) {
int cmp = strcmp(feature, (char *)getdata(ln));
if (cmp == 0) {
/* Already there. Never an error. */
break;
}
if (cmp < 0) {
zinsertlinknode(m->autoloads, prev,
ztrdup(feature));
break;
}
prev = ln;
}
if (!ln)
zaddlinknode(m->autoloads, ztrdup(feature));
}
} else if (m->autoloads) {
LinkNode ln;
if ((ln = linknodebystring(m->autoloads, feature)))
zsfree((char *)remnode(m->autoloads, ln));
else {
/*
* With -i (or zmodload -Fa), removing an autoload
* that's not there is not an error.
*/
subret = (flags & FEAT_IGNORE) ? -2 : 2;
}
}
if (subret == 0)
subret = fn(module, fnam, flags);
if (subret != 0) {
/* -2 indicates not an error, just skip running fn() */
if (subret != -2)
ret = 1;
switch (subret) {
case 1:
zwarnnam(cmdnam, "failed to add %s `%s'", typnam, fnam);
break;
case 2:
zwarnnam(cmdnam, "%s: no such %s", fnam, typnam);
break;
case 3:
zwarnnam(cmdnam, "%s: %s is already defined", fnam, typnam);
break;
default:
/* no (further) message needed */
break;
}
}
}
return ret;
}
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