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zsh/Src/hashtable.c
Roman Perepelitsa 6f6363de94 46275: eliminate undefined behavior caused by redefinition of hashtable 
struct hashtable has different set of data members in different
translation units. This is undefined behavior.
2020-07-29 08:27:15 +02:00

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/*
* hashtable.c - hash tables
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* 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 Paul Falstad 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 Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad 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 Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "../config.h"
#include "zsh.mdh"
#include "hashtable.pro"
typedef struct scanstatus *ScanStatus;
typedef struct hashtableimpl* HashTableImpl;
struct hashtableimpl {
/* Public part of hash table, accessible from outside of hashtable.c. *
* Must be the first field to allow casting HashTable to HashTableImpl. */
struct hashtable pub;
/* HASHTABLE INTERNAL MEMBERS */
ScanStatus scan; /* status of a scan over this hashtable */
#ifdef ZSH_HASH_DEBUG
/* HASHTABLE DEBUG MEMBERS */
HashTableImpl next, last; /* linked list of all hash tables */
char *tablename; /* string containing name of the hash table */
PrintTableStats printinfo; /* pointer to function to print table stats */
#endif /* !ZSH_HASH_DEBUG */
};
static inline HashTableImpl impl(HashTable ht) { return (HashTableImpl)ht; }
/* Structure for recording status of a hashtable scan in progress. When a *
* scan starts, the .scan member of the hashtable structure points to one *
* of these. That member being non-NULL disables resizing of the *
* hashtable (when adding elements). When elements are deleted, the *
* contents of this structure is used to make sure the scan won't stumble *
* into the deleted element. */
struct scanstatus {
int sorted;
union {
struct {
HashNode *hashtab;
int ct;
} s;
HashNode u;
} u;
};
/********************************/
/* Generic Hash Table functions */
/********************************/
#ifdef ZSH_HASH_DEBUG
static void printhashtabinfo(HashTable ht);
static HashTableImpl firstht, lastht;
#endif /* ZSH_HASH_DEBUG */
/* Generic hash function */
/**/
mod_export unsigned
hasher(const char *str)
{
unsigned hashval = 0, c;
while ((c = *((unsigned char *) str++)))
hashval += (hashval << 5) + c;
return hashval;
}
/* Get a new hash table */
/**/
mod_export HashTable
newhashtable(int size, UNUSED(char const *name), UNUSED(PrintTableStats printinfo))
{
HashTableImpl ht;
ht = (HashTableImpl) zshcalloc(sizeof *ht);
#ifdef ZSH_HASH_DEBUG
ht->next = NULL;
if(!firstht)
firstht = ht;
ht->last = lastht;
if(lastht)
lastht->next = ht;
lastht = ht;
ht->printinfo = printinfo ? printinfo : printhashtabinfo;
ht->tablename = ztrdup(name);
#endif /* ZSH_HASH_DEBUG */
ht->pub.nodes = (HashNode *) zshcalloc(size * sizeof(HashNode));
ht->pub.hsize = size;
ht->pub.ct = 0;
ht->scan = NULL;
ht->pub.scantab = NULL;
return &ht->pub;
}
/* Delete a hash table. After this function has been used, any *
* existing pointers to the hash table are invalid. */
/**/
mod_export void
deletehashtable(HashTable ht)
{
ht->emptytable(ht);
#ifdef ZSH_HASH_DEBUG
if(impl(ht)->next)
impl(ht)->next->last = impl(ht)->last;
else
lastht = impl(ht)->last;
if(impl(ht)->last)
impl(ht)->last->next = impl(ht)->next;
else
firstht = impl(ht)->next;
zsfree(impl(ht)->tablename);
#endif /* ZSH_HASH_DEBUG */
zfree(ht->nodes, ht->hsize * sizeof(HashNode));
zfree(ht, sizeof(struct hashtableimpl));
}
/* Add a node to a hash table. *
* nam is the key to use in hashing. nodeptr points *
* to the node to add. If there is already a node in *
* the table with the same key, it is first freed, and *
* then the new node is added. If the number of nodes *
* is now greater than twice the number of hash values, *
* the table is then expanded. */
/**/
mod_export void
addhashnode(HashTable ht, char *nam, void *nodeptr)
{
HashNode oldnode = addhashnode2(ht, nam, nodeptr);
if (oldnode)
ht->freenode(oldnode);
}
/* Add a node to a hash table, returning the old node on replacement. */
/**/
HashNode
addhashnode2(HashTable ht, char *nam, void *nodeptr)
{
unsigned hashval;
HashNode hn, hp, hq;
hn = (HashNode) nodeptr;
hn->nam = nam;
hashval = ht->hash(hn->nam) % ht->hsize;
hp = ht->nodes[hashval];
/* check if this is the first node for this hash value */
if (!hp) {
hn->next = NULL;
ht->nodes[hashval] = hn;
if (++ht->ct >= ht->hsize * 2 && !impl(ht)->scan)
expandhashtable(ht);
return NULL;
}
/* else check if the first node contains the same key */
if (ht->cmpnodes(hp->nam, hn->nam) == 0) {
ht->nodes[hashval] = hn;
replacing:
hn->next = hp->next;
if(impl(ht)->scan) {
if(impl(ht)->scan->sorted) {
HashNode *hashtab = impl(ht)->scan->u.s.hashtab;
int i;
for(i = impl(ht)->scan->u.s.ct; i--; )
if(hashtab[i] == hp)
hashtab[i] = hn;
} else if(impl(ht)->scan->u.u == hp)
impl(ht)->scan->u.u = hn;
}
return hp;
}
/* else run through the list and check all the keys */
hq = hp;
hp = hp->next;
for (; hp; hq = hp, hp = hp->next) {
if (ht->cmpnodes(hp->nam, hn->nam) == 0) {
hq->next = hn;
goto replacing;
}
}
/* else just add it at the front of the list */
hn->next = ht->nodes[hashval];
ht->nodes[hashval] = hn;
if (++ht->ct >= ht->hsize * 2 && !impl(ht)->scan)
expandhashtable(ht);
return NULL;
}
/* Get an enabled entry in a hash table. *
* If successful, it returns a pointer to *
* the hashnode. If the node is DISABLED *
* or isn't found, it returns NULL */
/**/
mod_export HashNode
gethashnode(HashTable ht, const char *nam)
{
unsigned hashval;
HashNode hp;
hashval = ht->hash(nam) % ht->hsize;
for (hp = ht->nodes[hashval]; hp; hp = hp->next) {
if (ht->cmpnodes(hp->nam, nam) == 0) {
if (hp->flags & DISABLED)
return NULL;
else
return hp;
}
}
return NULL;
}
/* Get an entry in a hash table. It will *
* ignore the DISABLED flag and return a *
* pointer to the hashnode if found, else *
* it returns NULL. */
/**/
mod_export HashNode
gethashnode2(HashTable ht, const char *nam)
{
unsigned hashval;
HashNode hp;
hashval = ht->hash(nam) % ht->hsize;
for (hp = ht->nodes[hashval]; hp; hp = hp->next) {
if (ht->cmpnodes(hp->nam, nam) == 0)
return hp;
}
return NULL;
}
/* Remove an entry from a hash table. *
* If successful, it removes the node from the *
* table and returns a pointer to it. If there *
* is no such node, then it returns NULL */
/**/
mod_export HashNode
removehashnode(HashTable ht, const char *nam)
{
unsigned hashval;
HashNode hp, hq;
hashval = ht->hash(nam) % ht->hsize;
hp = ht->nodes[hashval];
/* if no nodes at this hash value, return NULL */
if (!hp)
return NULL;
/* else check if the key in the first one matches */
if (ht->cmpnodes(hp->nam, nam) == 0) {
ht->nodes[hashval] = hp->next;
gotit:
ht->ct--;
if(impl(ht)->scan) {
if(impl(ht)->scan->sorted) {
HashNode *hashtab = impl(ht)->scan->u.s.hashtab;
int i;
for(i = impl(ht)->scan->u.s.ct; i--; )
if(hashtab[i] == hp)
hashtab[i] = NULL;
} else if(impl(ht)->scan->u.u == hp)
impl(ht)->scan->u.u = hp->next;
}
return hp;
}
/* else run through the list and check the rest of the keys */
hq = hp;
hp = hp->next;
for (; hp; hq = hp, hp = hp->next) {
if (ht->cmpnodes(hp->nam, nam) == 0) {
hq->next = hp->next;
goto gotit;
}
}
/* else it is not in the list, so return NULL */
return NULL;
}
/* Disable a node in a hash table */
/**/
void
disablehashnode(HashNode hn, UNUSED(int flags))
{
hn->flags |= DISABLED;
}
/* Enable a node in a hash table */
/**/
void
enablehashnode(HashNode hn, UNUSED(int flags))
{
hn->flags &= ~DISABLED;
}
/* Compare two hash table entries by name */
/**/
static int
hnamcmp(const void *ap, const void *bp)
{
HashNode a = *(HashNode *)ap;
HashNode b = *(HashNode *)bp;
return ztrcmp(a->nam, b->nam);
}
/* Scan the nodes in a hash table and execute scanfunc on nodes based on
* the flags that are set/unset. scanflags is passed unchanged to
* scanfunc (if executed).
*
* If sorted != 0, then sort entries of hash table before scanning.
* If flags1 > 0, then execute scanfunc on a node only if at least one of
* these flags is set.
* If flags2 > 0, then execute scanfunc on a node only if all of
* these flags are NOT set.
* The conditions above for flags1/flags2 must both be true.
*
* It is safe to add, remove or replace hash table elements from within
* the scanfunc. Replaced elements will appear in the scan exactly once,
* the new version if it was not scanned before the replacement was made.
* Added elements might or might not appear in the scan.
*
* pprog, if non-NULL, is a pattern that must match the name
* of the node.
*
* The function returns the number of matches, as reduced by pprog, flags1
* and flags2.
*/
/**/
mod_export int
scanmatchtable(HashTable ht, Patprog pprog, int sorted,
int flags1, int flags2, ScanFunc scanfunc, int scanflags)
{
int match = 0;
struct scanstatus st;
/*
* scantab is currently only used by modules to scan
* tables where the contents are generated on the fly from
* other objects. Note the fact that in this case pprog,
* sorted, flags1 and flags2 are ignore.
*/
if (!pprog && ht->scantab) {
ht->scantab(ht, scanfunc, scanflags);
return ht->ct;
}
if (sorted) {
int i, ct = ht->ct;
VARARR(HashNode, hnsorttab, ct);
HashNode *htp, hn;
/*
* Because the structure might change under our feet,
* we can't apply the flags and the pattern before sorting,
* tempting though that is.
*/
for (htp = hnsorttab, i = 0; i < ht->hsize; i++)
for (hn = ht->nodes[i]; hn; hn = hn->next)
*htp++ = hn;
qsort((void *)hnsorttab, ct, sizeof(HashNode), hnamcmp);
st.sorted = 1;
st.u.s.hashtab = hnsorttab;
st.u.s.ct = ct;
impl(ht)->scan = &st;
for (htp = hnsorttab, i = 0; i < ct; i++, htp++) {
if ((!flags1 || ((*htp)->flags & flags1)) &&
!((*htp)->flags & flags2) &&
(!pprog || pattry(pprog, (*htp)->nam))) {
match++;
scanfunc(*htp, scanflags);
}
}
impl(ht)->scan = NULL;
} else {
int i, hsize = ht->hsize;
HashNode *nodes = ht->nodes;
st.sorted = 0;
impl(ht)->scan = &st;
for (i = 0; i < hsize; i++)
for (st.u.u = nodes[i]; st.u.u; ) {
HashNode hn = st.u.u;
st.u.u = st.u.u->next;
if ((!flags1 || (hn->flags & flags1)) && !(hn->flags & flags2)
&& (!pprog || pattry(pprog, hn->nam))) {
match++;
scanfunc(hn, scanflags);
}
}
impl(ht)->scan = NULL;
}
return match;
}
/**/
mod_export int
scanhashtable(HashTable ht, int sorted, int flags1, int flags2,
ScanFunc scanfunc, int scanflags)
{
return scanmatchtable(ht, NULL, sorted, flags1, flags2,
scanfunc, scanflags);
}
/* Expand hash tables when they get too many entries. *
* The new size is 4 times the previous size. */
/**/
static void
expandhashtable(HashTable ht)
{
struct hashnode **onodes, **ha, *hn, *hp;
int i, osize;
osize = ht->hsize;
onodes = ht->nodes;
ht->hsize = osize * 4;
ht->nodes = (HashNode *) zshcalloc(ht->hsize * sizeof(HashNode));
ht->ct = 0;
/* scan through the old list of nodes, and *
* rehash them into the new list of nodes */
for (i = 0, ha = onodes; i < osize; i++, ha++) {
for (hn = *ha; hn;) {
hp = hn->next;
ht->addnode(ht, hn->nam, hn);
hn = hp;
}
}
zfree(onodes, osize * sizeof(HashNode));
}
/* Empty the hash table and resize it if necessary */
/**/
static void
resizehashtable(HashTable ht, int newsize)
{
struct hashnode **ha, *hn, *hp;
int i;
/* free all the hash nodes */
ha = ht->nodes;
for (i = 0; i < ht->hsize; i++, ha++) {
for (hn = *ha; hn;) {
hp = hn->next;
ht->freenode(hn);
hn = hp;
}
}
/* If new size desired is different from current size, *
* we free it and allocate a new nodes array. */
if (ht->hsize != newsize) {
zfree(ht->nodes, ht->hsize * sizeof(HashNode));
ht->nodes = (HashNode *) zshcalloc(newsize * sizeof(HashNode));
ht->hsize = newsize;
} else {
/* else we just re-zero the current nodes array */
memset(ht->nodes, 0, newsize * sizeof(HashNode));
}
ht->ct = 0;
}
/* Generic method to empty a hash table */
/**/
mod_export void
emptyhashtable(HashTable ht)
{
resizehashtable(ht, ht->hsize);
}
/**/
#ifdef ZSH_HASH_DEBUG
/* Print info about hash table */
#define MAXDEPTH 7
/**/
static void
printhashtabinfo(HashTable ht)
{
HashNode hn;
int chainlen[MAXDEPTH + 1];
int i, tmpcount, total;
printf("name of table : %s\n", impl(ht)->tablename);
printf("size of nodes[] : %d\n", ht->hsize);
printf("number of nodes : %d\n\n", ht->ct);
memset(chainlen, 0, sizeof(chainlen));
/* count the number of nodes just to be sure */
total = 0;
for (i = 0; i < ht->hsize; i++) {
tmpcount = 0;
for (hn = ht->nodes[i]; hn; hn = hn->next)
tmpcount++;
if (tmpcount >= MAXDEPTH)
chainlen[MAXDEPTH]++;
else
chainlen[tmpcount]++;
total += tmpcount;
}
for (i = 0; i < MAXDEPTH; i++)
printf("number of hash values with chain of length %d : %4d\n", i, chainlen[i]);
printf("number of hash values with chain of length %d+ : %4d\n", MAXDEPTH, chainlen[MAXDEPTH]);
printf("total number of nodes : %4d\n", total);
}
/**/
int
bin_hashinfo(UNUSED(char *nam), UNUSED(char **args), UNUSED(Options ops), UNUSED(int func))
{
HashTableImpl ht;
printf("----------------------------------------------------\n");
queue_signals();
for(ht = firstht; ht; ht = ht->next) {
ht->printinfo(&ht->pub);
printf("----------------------------------------------------\n");
}
unqueue_signals();
return 0;
}
/**/
#endif /* ZSH_HASH_DEBUG */
/********************************/
/* Command Hash Table Functions */
/********************************/
/* hash table containing external commands */
/**/
mod_export HashTable cmdnamtab;
/* how far we've hashed the PATH so far */
/**/
mod_export char **pathchecked;
/* Create a new command hash table */
/**/
void
createcmdnamtable(void)
{
cmdnamtab = newhashtable(201, "cmdnamtab", NULL);
cmdnamtab->hash = hasher;
cmdnamtab->emptytable = emptycmdnamtable;
cmdnamtab->filltable = fillcmdnamtable;
cmdnamtab->cmpnodes = strcmp;
cmdnamtab->addnode = addhashnode;
cmdnamtab->getnode = gethashnode2;
cmdnamtab->getnode2 = gethashnode2;
cmdnamtab->removenode = removehashnode;
cmdnamtab->disablenode = NULL;
cmdnamtab->enablenode = NULL;
cmdnamtab->freenode = freecmdnamnode;
cmdnamtab->printnode = printcmdnamnode;
pathchecked = path;
}
/**/
static void
emptycmdnamtable(HashTable ht)
{
emptyhashtable(ht);
pathchecked = path;
}
/* Add all commands in a given directory *
* to the command hashtable. */
/**/
void
hashdir(char **dirp)
{
Cmdnam cn;
DIR *dir;
char *fn, *unmetadir, *pathbuf, *pathptr;
int dirlen;
#if defined(_WIN32) || defined(__CYGWIN__)
char *exe;
#endif /* _WIN32 || _CYGWIN__ */
if (isrelative(*dirp))
return;
unmetadir = unmeta(*dirp);
if (!(dir = opendir(unmetadir)))
return;
dirlen = strlen(unmetadir);
pathbuf = (char *)zalloc(dirlen + PATH_MAX + 2);
sprintf(pathbuf, "%s/", unmetadir);
pathptr = pathbuf + dirlen + 1;
while ((fn = zreaddir(dir, 1))) {
if (!cmdnamtab->getnode(cmdnamtab, fn)) {
char *fname = ztrdup(fn);
struct stat statbuf;
int add = 0, dummylen;
unmetafy(fn, &dummylen);
if (strlen(fn) > PATH_MAX) {
/* Too heavy to do all the allocation */
add = 1;
} else {
strcpy(pathptr, fn);
/*
* This is the same test as for the glob qualifier for
* executable plain files.
*/
if (unset(HASHEXECUTABLESONLY) ||
(access(pathbuf, X_OK) == 0 &&
stat(pathbuf, &statbuf) == 0 &&
S_ISREG(statbuf.st_mode) && (statbuf.st_mode & S_IXUGO)))
add = 1;
}
if (add) {
cn = (Cmdnam) zshcalloc(sizeof *cn);
cn->node.flags = 0;
cn->u.name = dirp;
cmdnamtab->addnode(cmdnamtab, fname, cn);
} else
zsfree(fname);
}
#if defined(_WIN32) || defined(__CYGWIN__)
/* Hash foo.exe as foo, since when no real foo exists, foo.exe
will get executed by DOS automatically. This quiets
spurious corrections when CORRECT or CORRECT_ALL is set. */
if ((exe = strrchr(fn, '.')) &&
(exe[1] == 'E' || exe[1] == 'e') &&
(exe[2] == 'X' || exe[2] == 'x') &&
(exe[3] == 'E' || exe[3] == 'e') && exe[4] == 0) {
*exe = 0;
if (!cmdnamtab->getnode(cmdnamtab, fn)) {
cn = (Cmdnam) zshcalloc(sizeof *cn);
cn->node.flags = 0;
cn->u.name = dirp;
cmdnamtab->addnode(cmdnamtab, ztrdup(fn), cn);
}
}
#endif /* _WIN32 || __CYGWIN__ */
}
closedir(dir);
zfree(pathbuf, dirlen + PATH_MAX + 2);
}
/* Go through user's PATH and add everything to *
* the command hashtable. */
/**/
static void
fillcmdnamtable(UNUSED(HashTable ht))
{
char **pq;
for (pq = pathchecked; *pq; pq++)
hashdir(pq);
pathchecked = pq;
}
/**/
static void
freecmdnamnode(HashNode hn)
{
Cmdnam cn = (Cmdnam) hn;
zsfree(cn->node.nam);
if (cn->node.flags & HASHED)
zsfree(cn->u.cmd);
zfree(cn, sizeof(struct cmdnam));
}
/* Print an element of the cmdnamtab hash table (external command) */
/**/
static void
printcmdnamnode(HashNode hn, int printflags)
{
Cmdnam cn = (Cmdnam) hn;
if (printflags & PRINT_WHENCE_WORD) {
printf("%s: %s\n", cn->node.nam, (cn->node.flags & HASHED) ?
"hashed" : "command");
return;
}
if ((printflags & PRINT_WHENCE_CSH) || (printflags & PRINT_WHENCE_SIMPLE)) {
if (cn->node.flags & HASHED) {
zputs(cn->u.cmd, stdout);
putchar('\n');
} else {
zputs(*(cn->u.name), stdout);
putchar('/');
zputs(cn->node.nam, stdout);
putchar('\n');
}
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
if (cn->node.flags & HASHED) {
nicezputs(cn->node.nam, stdout);
printf(" is hashed to ");
nicezputs(cn->u.cmd, stdout);
putchar('\n');
} else {
nicezputs(cn->node.nam, stdout);
printf(" is ");
nicezputs(*(cn->u.name), stdout);
putchar('/');
nicezputs(cn->node.nam, stdout);
putchar('\n');
}
return;
}
if (printflags & PRINT_LIST) {
printf("hash ");
if(cn->node.nam[0] == '-')
printf("-- ");
}
if (cn->node.flags & HASHED) {
quotedzputs(cn->node.nam, stdout);
putchar('=');
quotedzputs(cn->u.cmd, stdout);
putchar('\n');
} else {
quotedzputs(cn->node.nam, stdout);
putchar('=');
quotedzputs(*(cn->u.name), stdout);
putchar('/');
quotedzputs(cn->node.nam, stdout);
putchar('\n');
}
}
/***************************************/
/* Shell Function Hash Table Functions */
/***************************************/
/* hash table containing the shell functions */
/**/
mod_export HashTable shfunctab;
/**/
void
createshfunctable(void)
{
shfunctab = newhashtable(7, "shfunctab", NULL);
shfunctab->hash = hasher;
shfunctab->emptytable = NULL;
shfunctab->filltable = NULL;
shfunctab->cmpnodes = strcmp;
shfunctab->addnode = addhashnode;
shfunctab->getnode = gethashnode;
shfunctab->getnode2 = gethashnode2;
shfunctab->removenode = removeshfuncnode;
shfunctab->disablenode = disableshfuncnode;
shfunctab->enablenode = enableshfuncnode;
shfunctab->freenode = freeshfuncnode;
shfunctab->printnode = printshfuncnode;
}
/* Remove an entry from the shell function hash table. *
* It checks if the function is a signal trap and if so, *
* it will disable the trapping of that signal. */
/**/
static HashNode
removeshfuncnode(UNUSED(HashTable ht), const char *nam)
{
HashNode hn;
int signum;
if (!strncmp(nam, "TRAP", 4) && (signum = getsignum(nam + 4)) != -1)
hn = removetrap(signum);
else
hn = removehashnode(shfunctab, nam);
return hn;
}
/* Disable an entry in the shell function hash table. *
* It checks if the function is a signal trap and if so, *
* it will disable the trapping of that signal. */
/**/
static void
disableshfuncnode(HashNode hn, UNUSED(int flags))
{
hn->flags |= DISABLED;
if (!strncmp(hn->nam, "TRAP", 4)) {
int signum = getsignum(hn->nam + 4);
if (signum != -1) {
sigtrapped[signum] &= ~ZSIG_FUNC;
unsettrap(signum);
}
}
}
/* Re-enable an entry in the shell function hash table. *
* It checks if the function is a signal trap and if so, *
* it will re-enable the trapping of that signal. */
/**/
static void
enableshfuncnode(HashNode hn, UNUSED(int flags))
{
Shfunc shf = (Shfunc) hn;
shf->node.flags &= ~DISABLED;
if (!strncmp(shf->node.nam, "TRAP", 4)) {
int signum = getsignum(shf->node.nam + 4);
if (signum != -1) {
settrap(signum, NULL, ZSIG_FUNC);
}
}
}
/**/
static void
freeshfuncnode(HashNode hn)
{
Shfunc shf = (Shfunc) hn;
zsfree(shf->node.nam);
if (shf->funcdef)
freeeprog(shf->funcdef);
if (shf->redir)
freeeprog(shf->redir);
dircache_set(&shf->filename, NULL);
if (shf->sticky) {
if (shf->sticky->n_on_opts)
zfree(shf->sticky->on_opts,
shf->sticky->n_on_opts * sizeof(*shf->sticky->on_opts));
if (shf->sticky->n_off_opts)
zfree(shf->sticky->off_opts,
shf->sticky->n_off_opts * sizeof(*shf->sticky->off_opts));
zfree(shf->sticky, sizeof(*shf->sticky));
}
zfree(shf, sizeof(struct shfunc));
}
/* Print a shell function */
/**/
static void
printshfuncnode(HashNode hn, int printflags)
{
Shfunc f = (Shfunc) hn;
char *t = 0;
if ((printflags & PRINT_NAMEONLY) ||
((printflags & PRINT_WHENCE_SIMPLE) &&
!(printflags & PRINT_WHENCE_FUNCDEF))) {
zputs(f->node.nam, stdout);
putchar('\n');
return;
}
if ((printflags & (PRINT_WHENCE_VERBOSE|PRINT_WHENCE_WORD)) &&
!(printflags & PRINT_WHENCE_FUNCDEF)) {
nicezputs(f->node.nam, stdout);
printf((printflags & PRINT_WHENCE_WORD) ? ": function" :
(f->node.flags & PM_UNDEFINED) ?
" is an autoload shell function" :
" is a shell function");
if ((printflags & PRINT_WHENCE_VERBOSE) && f->filename) {
printf(" from ");
quotedzputs(f->filename, stdout);
if (f->node.flags & PM_LOADDIR) {
printf("/");
quotedzputs(f->node.nam, stdout);
}
}
putchar('\n');
return;
}
quotedzputs(f->node.nam, stdout);
if (f->funcdef || f->node.flags & PM_UNDEFINED) {
printf(" () {\n");
zoutputtab(stdout);
if (f->node.flags & PM_UNDEFINED) {
printf("%c undefined\n", hashchar);
zoutputtab(stdout);
} else
t = getpermtext(f->funcdef, NULL, 1);
if (f->node.flags & (PM_TAGGED|PM_TAGGED_LOCAL)) {
printf("%c traced\n", hashchar);
zoutputtab(stdout);
}
if (!t) {
char *fopt = "UtTkzc";
int flgs[] = {
PM_UNALIASED, PM_TAGGED, PM_TAGGED_LOCAL,
PM_KSHSTORED, PM_ZSHSTORED, PM_CUR_FPATH, 0
};
int fl;;
zputs("builtin autoload -X", stdout);
for (fl=0;fopt[fl];fl++)
if (f->node.flags & flgs[fl]) putchar(fopt[fl]);
if (f->filename && (f->node.flags & PM_LOADDIR)) {
putchar(' ');
zputs(f->filename, stdout);
}
} else {
zputs(t, stdout);
zsfree(t);
if (f->funcdef->flags & EF_RUN) {
printf("\n");
zoutputtab(stdout);
quotedzputs(f->node.nam, stdout);
printf(" \"$@\"");
}
}
printf("\n}");
} else {
printf(" () { }");
}
if (f->redir) {
t = getpermtext(f->redir, NULL, 1);
if (t) {
zputs(t, stdout);
zsfree(t);
}
}
putchar('\n');
}
/*
* Wrap scanmatchtable for shell functions with optional
* expansion of leading tabs.
* expand = 0 is standard: use hard tabs.
* expand > 0 uses that many spaces.
* expand < 0 uses no indentation.
*
* Note this function and the following two are called with
* interrupts queued, so saving and restoring text_expand_tabs
* is safe.
*/
/**/
mod_export int
scanmatchshfunc(Patprog pprog, int sorted, int flags1, int flags2,
ScanFunc scanfunc, int scanflags, int expand)
{
int ret, save_expand;
save_expand = text_expand_tabs;
text_expand_tabs = expand;
ret = scanmatchtable(shfunctab, pprog, sorted, flags1, flags2,
scanfunc, scanflags);
text_expand_tabs = save_expand;
return ret;
}
/* Wrap scanhashtable to expand tabs for shell functions */
/**/
mod_export int
scanshfunc(int sorted, int flags1, int flags2,
ScanFunc scanfunc, int scanflags, int expand)
{
return scanmatchshfunc(NULL, sorted, flags1, flags2,
scanfunc, scanflags, expand);
}
/* Wrap shfunctab->printnode to expand tabs */
/**/
mod_export void
printshfuncexpand(HashNode hn, int printflags, int expand)
{
int save_expand;
save_expand = text_expand_tabs;
text_expand_tabs = expand;
shfunctab->printnode(hn, printflags);
text_expand_tabs = save_expand;
}
/*
* Get a heap-duplicated name of the shell function, for
* use in tracing.
*/
/**/
mod_export char *
getshfuncfile(Shfunc shf)
{
if (shf->node.flags & PM_LOADDIR) {
return zhtricat(shf->filename, "/", shf->node.nam);
} else if (shf->filename) {
return dupstring(shf->filename);
} else {
return NULL;
}
}
/**************************************/
/* Reserved Word Hash Table Functions */
/**************************************/
/* Nodes for reserved word hash table */
static struct reswd reswds[] = {
{{NULL, "!", 0}, BANG},
{{NULL, "[[", 0}, DINBRACK},
{{NULL, "{", 0}, INBRACE},
{{NULL, "}", 0}, OUTBRACE},
{{NULL, "case", 0}, CASE},
{{NULL, "coproc", 0}, COPROC},
{{NULL, "declare", 0}, TYPESET},
{{NULL, "do", 0}, DOLOOP},
{{NULL, "done", 0}, DONE},
{{NULL, "elif", 0}, ELIF},
{{NULL, "else", 0}, ELSE},
{{NULL, "end", 0}, ZEND},
{{NULL, "esac", 0}, ESAC},
{{NULL, "export", 0}, TYPESET},
{{NULL, "fi", 0}, FI},
{{NULL, "float", 0}, TYPESET},
{{NULL, "for", 0}, FOR},
{{NULL, "foreach", 0}, FOREACH},
{{NULL, "function", 0}, FUNC},
{{NULL, "if", 0}, IF},
{{NULL, "integer", 0}, TYPESET},
{{NULL, "local", 0}, TYPESET},
{{NULL, "nocorrect", 0}, NOCORRECT},
{{NULL, "readonly", 0}, TYPESET},
{{NULL, "repeat", 0}, REPEAT},
{{NULL, "select", 0}, SELECT},
{{NULL, "then", 0}, THEN},
{{NULL, "time", 0}, TIME},
{{NULL, "typeset", 0}, TYPESET},
{{NULL, "until", 0}, UNTIL},
{{NULL, "while", 0}, WHILE},
{{NULL, NULL, 0}, 0}
};
/* hash table containing the reserved words */
/**/
mod_export HashTable reswdtab;
/* Build the hash table containing zsh's reserved words. */
/**/
void
createreswdtable(void)
{
Reswd rw;
reswdtab = newhashtable(23, "reswdtab", NULL);
reswdtab->hash = hasher;
reswdtab->emptytable = NULL;
reswdtab->filltable = NULL;
reswdtab->cmpnodes = strcmp;
reswdtab->addnode = addhashnode;
reswdtab->getnode = gethashnode;
reswdtab->getnode2 = gethashnode2;
reswdtab->removenode = NULL;
reswdtab->disablenode = disablehashnode;
reswdtab->enablenode = enablehashnode;
reswdtab->freenode = NULL;
reswdtab->printnode = printreswdnode;
for (rw = reswds; rw->node.nam; rw++)
reswdtab->addnode(reswdtab, rw->node.nam, rw);
}
/* Print a reserved word */
/**/
static void
printreswdnode(HashNode hn, int printflags)
{
Reswd rw = (Reswd) hn;
if (printflags & PRINT_WHENCE_WORD) {
printf("%s: reserved\n", rw->node.nam);
return;
}
if (printflags & PRINT_WHENCE_CSH) {
printf("%s: shell reserved word\n", rw->node.nam);
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
printf("%s is a reserved word\n", rw->node.nam);
return;
}
/* default is name only */
printf("%s\n", rw->node.nam);
}
/********************************/
/* Aliases Hash Table Functions */
/********************************/
/* hash table containing the aliases */
/**/
mod_export HashTable aliastab;
/* has table containing suffix aliases */
/**/
mod_export HashTable sufaliastab;
/* Create new hash tables for aliases */
/**/
void
createaliastable(HashTable ht)
{
ht->hash = hasher;
ht->emptytable = NULL;
ht->filltable = NULL;
ht->cmpnodes = strcmp;
ht->addnode = addhashnode;
ht->getnode = gethashnode;
ht->getnode2 = gethashnode2;
ht->removenode = removehashnode;
ht->disablenode = disablehashnode;
ht->enablenode = enablehashnode;
ht->freenode = freealiasnode;
ht->printnode = printaliasnode;
}
/**/
void
createaliastables(void)
{
/* Table for regular and global aliases */
aliastab = newhashtable(23, "aliastab", NULL);
createaliastable(aliastab);
/* add the default aliases */
aliastab->addnode(aliastab, ztrdup("run-help"), createaliasnode(ztrdup("man"), 0));
aliastab->addnode(aliastab, ztrdup("which-command"), createaliasnode(ztrdup("whence"), 0));
/* Table for suffix aliases --- make this smaller */
sufaliastab = newhashtable(11, "sufaliastab", NULL);
createaliastable(sufaliastab);
}
/* Create a new alias node */
/**/
mod_export Alias
createaliasnode(char *txt, int flags)
{
Alias al;
al = (Alias) zshcalloc(sizeof *al);
al->node.flags = flags;
al->text = txt;
al->inuse = 0;
return al;
}
/**/
static void
freealiasnode(HashNode hn)
{
Alias al = (Alias) hn;
zsfree(al->node.nam);
zsfree(al->text);
zfree(al, sizeof(struct alias));
}
/* Print an alias */
/**/
static void
printaliasnode(HashNode hn, int printflags)
{
Alias a = (Alias) hn;
if (printflags & PRINT_NAMEONLY) {
zputs(a->node.nam, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_WORD) {
if (a->node.flags & ALIAS_SUFFIX)
printf("%s: suffix alias\n", a->node.nam);
else if (a->node.flags & ALIAS_GLOBAL)
printf("%s: global alias\n", a->node.nam);
else
printf("%s: alias\n", a->node.nam);
return;
}
if (printflags & PRINT_WHENCE_SIMPLE) {
zputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_CSH) {
nicezputs(a->node.nam, stdout);
printf(": ");
if (a->node.flags & ALIAS_SUFFIX)
printf("suffix ");
else if (a->node.flags & ALIAS_GLOBAL)
printf("globally ");
printf ("aliased to ");
nicezputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
nicezputs(a->node.nam, stdout);
printf(" is a");
if (a->node.flags & ALIAS_SUFFIX)
printf(" suffix");
else if (a->node.flags & ALIAS_GLOBAL)
printf(" global");
else
printf("n");
printf(" alias for ");
nicezputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_LIST) {
/* Fast fail on unrepresentable values. */
if (strchr(a->node.nam, '=')) {
zwarn("invalid alias '%s' encountered while printing aliases",
a->node.nam);
/* ### TODO: Return an error status to the C caller */
return;
}
/* Normal path. */
printf("alias ");
if (a->node.flags & ALIAS_SUFFIX)
printf("-s ");
else if (a->node.flags & ALIAS_GLOBAL)
printf("-g ");
/* If an alias begins with `-' or `+', then we must output `-- '
* first, so that it is not interpreted as an option. */
if(a->node.nam[0] == '-' || a->node.nam[0] == '+')
printf("-- ");
}
quotedzputs(a->node.nam, stdout);
putchar('=');
quotedzputs(a->text, stdout);
putchar('\n');
}
/*************************************/
/* History Line Hash Table Functions */
/*************************************/
/**/
void
createhisttable(void)
{
histtab = newhashtable(599, "histtab", NULL);
histtab->hash = histhasher;
histtab->emptytable = emptyhisttable;
histtab->filltable = NULL;
histtab->cmpnodes = histstrcmp;
histtab->addnode = addhistnode;
histtab->getnode = gethashnode2;
histtab->getnode2 = gethashnode2;
histtab->removenode = removehashnode;
histtab->disablenode = NULL;
histtab->enablenode = NULL;
histtab->freenode = freehistnode;
histtab->printnode = NULL;
}
/**/
unsigned
histhasher(const char *str)
{
unsigned hashval = 0;
while (inblank(*str)) str++;
while (*str) {
if (inblank(*str)) {
do str++; while (inblank(*str));
if (*str)
hashval += (hashval << 5) + ' ';
}
else
hashval += (hashval << 5) + *(unsigned char *)str++;
}
return hashval;
}
/**/
void
emptyhisttable(HashTable ht)
{
emptyhashtable(ht);
if (hist_ring)
histremovedups();
}
/* Compare two strings with normalized white-space */
/**/
int
histstrcmp(const char *str1, const char *str2)
{
while (inblank(*str1)) str1++;
while (inblank(*str2)) str2++;
while (*str1 && *str2) {
if (inblank(*str1)) {
if (!inblank(*str2))
break;
do str1++; while (inblank(*str1));
do str2++; while (inblank(*str2));
}
else {
if (*str1 != *str2)
break;
str1++;
str2++;
}
}
return *str1 - *str2;
}
/**/
void
addhistnode(HashTable ht, char *nam, void *nodeptr)
{
HashNode oldnode = addhashnode2(ht, nam, nodeptr);
Histent he = (Histent)nodeptr;
if (oldnode && oldnode != (HashNode)nodeptr) {
if (he->node.flags & HIST_MAKEUNIQUE
|| (he->node.flags & HIST_FOREIGN && (Histent)oldnode == he->up)) {
(void) addhashnode2(ht, oldnode->nam, oldnode); /* restore hash */
he->node.flags |= HIST_DUP;
he->node.flags &= ~HIST_MAKEUNIQUE;
}
else {
oldnode->flags |= HIST_DUP;
if (hist_ignore_all_dups)
freehistnode(oldnode); /* Remove the old dup */
}
}
else
he->node.flags &= ~HIST_MAKEUNIQUE;
}
/**/
void
freehistnode(HashNode nodeptr)
{
freehistdata((Histent)nodeptr, 1);
zfree(nodeptr, sizeof (struct histent));
}
/**/
void
freehistdata(Histent he, int unlink)
{
if (!he)
return;
if (he == &curline)
return;
if (!(he->node.flags & (HIST_DUP | HIST_TMPSTORE)))
removehashnode(histtab, he->node.nam);
zsfree(he->node.nam);
if (he->nwords)
zfree(he->words, he->nwords*2*sizeof(short));
if (unlink) {
if (!--histlinect)
hist_ring = NULL;
else {
if (he == hist_ring)
hist_ring = hist_ring->up;
he->up->down = he->down;
he->down->up = he->up;
}
}
}
/***********************************************************************
* Directory name cache mechanism
*
* The idea of this is that there are various shell structures,
* notably functions, that record the directories with which they
* are associated. Rather than store the full string each time,
* we store a pointer to the same location and count the references.
* This is optimised so that retrieval is quick at the expense of
* searching the list when setting up the structure, which is a much
* rarer operation.
*
* There is nothing special about the fact that the strings are
* directories, except for the assumptions for efficiency that many
* structures will point to the same one, and that there are not too
* many different directories associated with the shell.
**********************************************************************/
struct dircache_entry
{
/* Name of directory in cache */
char *name;
/* Number of references to it */
int refs;
};
/*
* dircache is the cache, of length dircache_size.
* dircache_lastentry is the last entry used, an optimisation
* for multiple references to the same directory, e.g
* "autoload /blah/blah/\*".
*/
static struct dircache_entry *dircache, *dircache_lastentry;
static int dircache_size;
/*
* Set *name to point to a cached version of value.
* value is copied so may come from any source.
*
* If value is NULL, look for the existing value of *name (safe if this
* too is NULL) and remove a reference to it from the cache. If it's
* not found in the cache, it's assumed to be an allocated string and
* freed --- this currently occurs for a shell function that's been
* loaded as the filename is now a full path, not just a directory,
* though we may one day optimise this to a cached directory plus a
* name, too. Note --- the function does *not* otherwise check
* if *name points to something already cached, so this is
* necessary any time *name may already be in the cache.
*/
/**/
mod_export void
dircache_set(char **name, char *value)
{
struct dircache_entry *dcptr, *dcnew;
if (!value) {
if (!*name)
return;
if (!dircache_size) {
zsfree(*name);
*name = NULL;
return;
}
for (dcptr = dircache; dcptr < dircache + dircache_size; dcptr++)
{
/* Must be a pointer much, not a string match */
if (*name == dcptr->name)
{
--dcptr->refs;
if (!dcptr->refs) {
ptrdiff_t ind = dcptr - dircache;
zsfree(dcptr->name);
--dircache_size;
if (!dircache_size) {
zfree(dircache, sizeof(*dircache));
dircache = NULL;
dircache_lastentry = NULL;
*name = NULL;
return;
}
dcnew = (struct dircache_entry *)
zalloc(dircache_size * sizeof(*dcnew));
if (ind)
memcpy(dcnew, dircache, ind * sizeof(*dcnew));
if (ind < dircache_size)
memcpy(dcnew + ind, dcptr + 1,
(dircache_size - ind) * sizeof(*dcnew));
zfree(dircache, (dircache_size+1)*sizeof(*dcnew));
dircache = dcnew;
dircache_lastentry = NULL;
}
*name = NULL;
return;
}
}
zsfree(*name);
*name = NULL;
} else {
/*
* As the function path has been resolved to a particular
* location, we'll store it as an absolute path.
*/
if (*value != '/') {
value = zhtricat(metafy(zgetcwd(), -1, META_HEAPDUP),
"/", value);
value = xsymlink(value, 1);
}
/*
* We'll maintain the cache at exactly the right size rather
* than overallocating. The rationale here is that typically
* we'll get a lot of functions in a small number of directories
* so the complexity overhead of maintaining a separate count
* isn't really matched by the efficiency gain.
*/
if (dircache_lastentry &&
!strcmp(value, dircache_lastentry->name)) {
*name = dircache_lastentry->name;
++dircache_lastentry->refs;
return;
} else if (!dircache_size) {
dircache_size = 1;
dcptr = dircache =
(struct dircache_entry *)zalloc(sizeof(*dircache));
} else {
for (dcptr = dircache; dcptr < dircache + dircache_size; dcptr++)
{
if (!strcmp(value, dcptr->name)) {
*name = dcptr->name;
++dcptr->refs;
return;
}
}
++dircache_size;
dircache = (struct dircache_entry *)
zrealloc(dircache, sizeof(*dircache) * dircache_size);
dcptr = dircache + dircache_size - 1;
}
dcptr->name = ztrdup(value);
*name = dcptr->name;
dcptr->refs = 1;
dircache_lastentry = dcptr;
}
}
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