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zsh/Src/hashtable.c
Tanaka Akira e74702b467 Initial revision
1999-04-15 18:05:38 +00:00

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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"
#ifdef ZSH_HASH_DEBUG
# define HASHTABLE_DEBUG_MEMBERS \
/* Members of struct hashtable used for debugging hash tables */ \
HashTable 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 */
#else /* !ZSH_HASH_DEBUG */
# define HASHTABLE_DEBUG_MEMBERS
#endif /* !ZSH_HASH_DEBUG */
#define HASHTABLE_INTERNAL_MEMBERS \
ScanStatus scan; /* status of a scan over this hashtable */ \
HASHTABLE_DEBUG_MEMBERS
typedef struct scanstatus *ScanStatus;
#include "zsh.mdh"
#include "hashtable.pro"
/* 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 *tab;
int ct;
} s;
HashNode u;
} u;
};
/********************************/
/* Generic Hash Table functions */
/********************************/
#ifdef ZSH_HASH_DEBUG
static HashTable firstht, lastht;
#endif /* ZSH_HASH_DEBUG */
/* Generic hash function */
/**/
unsigned
hasher(char *str)
{
unsigned hashval = 0;
while (*str)
hashval += (hashval << 5) + ((unsigned) *str++);
return hashval;
}
/* Get a new hash table */
/**/
HashTable
newhashtable(int size, char const *name, PrintTableStats printinfo)
{
HashTable ht;
ht = (HashTable) zcalloc(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->nodes = (HashNode *) zcalloc(size * sizeof(HashNode));
ht->hsize = size;
ht->ct = 0;
ht->scan = NULL;
return ht;
}
/* Delete a hash table. After this function has been used, any *
* existing pointers to the hash table are invalid. */
/**/
void
deletehashtable(HashTable ht)
{
ht->emptytable(ht);
#ifdef ZSH_HASH_DEBUG
if(ht->next)
ht->next->last = ht->last;
else
lastht = ht->last;
if(ht->last)
ht->last->next = ht->next;
else
firstht = ht->next;
#endif /* ZSH_HASH_DEBUG */
zfree(ht->nodes, ht->hsize * sizeof(HashNode));
zfree(ht, sizeof(*ht));
}
/* Add a node to a hash table. *
* nam is the key to use in hashing. dat is a pointer *
* 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. */
/**/
void
addhashnode(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 && !ht->scan)
expandhashtable(ht);
return;
}
/* else check if the first node contains the same key */
if (!strcmp(hp->nam, hn->nam)) {
ht->nodes[hashval] = hn;
replacing:
hn->next = hp->next;
if(ht->scan)
if(ht->scan->sorted) {
HashNode *tab = ht->scan->u.s.tab;
int i;
for(i = ht->scan->u.s.ct; i--; )
if(tab[i] == hp)
tab[i] = hn;
} else if(ht->scan->u.u == hp)
ht->scan->u.u = hn;
ht->freenode(hp);
return;
}
/* else run through the list and check all the keys */
hq = hp;
hp = hp->next;
for (; hp; hq = hp, hp = hp->next) {
if (!strcmp(hp->nam, hn->nam)) {
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 && !ht->scan)
expandhashtable(ht);
}
/* 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 */
/**/
HashNode
gethashnode(HashTable ht, char *nam)
{
unsigned hashval;
HashNode hp;
hashval = ht->hash(nam) % ht->hsize;
for (hp = ht->nodes[hashval]; hp; hp = hp->next) {
if (!strcmp(hp->nam, nam)) {
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. */
/**/
HashNode
gethashnode2(HashTable ht, char *nam)
{
unsigned hashval;
HashNode hp;
hashval = ht->hash(nam) % ht->hsize;
for (hp = ht->nodes[hashval]; hp; hp = hp->next) {
if (!strcmp(hp->nam, nam))
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 */
/**/
HashNode
removehashnode(HashTable ht, 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 (!strcmp(hp->nam, nam)) {
ht->nodes[hashval] = hp->next;
gotit:
ht->ct--;
if(ht->scan)
if(ht->scan->sorted) {
HashNode *tab = ht->scan->u.s.tab;
int i;
for(i = ht->scan->u.s.ct; i--; )
if(tab[i] == hp)
tab[i] = NULL;
} else if(ht->scan->u.u == hp)
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 (!strcmp(hp->nam, nam)) {
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, int flags)
{
hn->flags |= DISABLED;
}
/* Enable a node in a hash table */
/**/
void
enablehashnode(HashNode hn, int flags)
{
hn->flags &= ~DISABLED;
}
/* Compare two hash table entries */
/**/
static int
hnamcmp(const void *ap, const void *bp)
{
HashNode a = *(HashNode *)ap;
HashNode b = *(HashNode *)bp;
return ztrcmp((unsigned char *) a->nam, (unsigned char *) 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.
*/
/**/
void
scanhashtable(HashTable ht, int sorted, int flags1, int flags2, ScanFunc scanfunc, int scanflags)
{
struct scanstatus st;
if (sorted) {
int i, ct = ht->ct;
VARARR(HashNode, hnsorttab, ct);
HashNode *htp, hn;
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.tab = hnsorttab;
st.u.s.ct = ct;
ht->scan = &st;
for (htp = hnsorttab, i = 0; i < ct; i++, htp++)
if (*htp && ((*htp)->flags & flags1) + !flags1 &&
!((*htp)->flags & flags2))
scanfunc(*htp, scanflags);
ht->scan = NULL;
} else {
int i, hsize = ht->hsize;
HashNode *nodes = ht->nodes;
st.sorted = 0;
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 ((hn->flags & flags1) + !flags1 && !(hn->flags & flags2))
scanfunc(hn, scanflags);
}
ht->scan = NULL;
}
}
/* Scan all nodes in a hash table and executes scanfunc on the *
* nodes which meet all the following criteria: *
* The hash key must match the glob pattern given by `com'. *
* If (flags1 > 0), then any flag in flags1 must be set. *
* If (flags2 > 0), then all flags in flags2 must NOT be set. *
* *
* scanflags is passed unchanged to scanfunc (if executed). *
* The return value is the number of matches. */
/**/
int
scanmatchtable(HashTable ht, Comp com, int flags1, int flags2, ScanFunc scanfunc, int scanflags)
{
int i, hsize = ht->hsize;
HashNode *nodes = ht->nodes;
int match = 0;
struct scanstatus st;
st.sorted = 0;
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 ((hn->flags & flags1) + !flags1 && !(hn->flags & flags2) &&
domatch(hn->nam, com, 0))
scanfunc(hn, scanflags);
match++;
}
ht->scan = NULL;
return match;
}
/* 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 *) zcalloc(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 *) zcalloc(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 */
/**/
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", 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(char *nam, char **args, char *ops, int func)
{
HashTable ht;
printf("----------------------------------------------------\n");
for(ht = firstht; ht; ht = ht->next) {
ht->printinfo(ht);
printf("----------------------------------------------------\n");
}
return 0;
}
#endif /* ZSH_HASH_DEBUG */
/********************************/
/* Command Hash Table Functions */
/********************************/
/* hash table containing external commands */
/**/
HashTable cmdnamtab;
/* how far we've hashed the PATH so far */
/**/
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->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;
if (isrelative(*dirp) || !(dir = opendir(unmeta(*dirp))))
return;
while ((fn = zreaddir(dir, 1))) {
if (!cmdnamtab->getnode(cmdnamtab, fn)) {
cn = (Cmdnam) zcalloc(sizeof *cn);
cn->flags = 0;
cn->u.name = dirp;
cmdnamtab->addnode(cmdnamtab, ztrdup(fn), cn);
}
}
closedir(dir);
}
/* Go through user's PATH and add everything to *
* the command hashtable. */
/**/
static void
fillcmdnamtable(HashTable ht)
{
char **pq;
for (pq = pathchecked; *pq; pq++)
hashdir(pq);
pathchecked = pq;
}
/**/
static void
freecmdnamnode(HashNode hn)
{
Cmdnam cn = (Cmdnam) hn;
zsfree(cn->nam);
if (cn->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->nam, (cn->flags & HASHED) ?
"hashed" : "command");
return;
}
if ((printflags & PRINT_WHENCE_CSH) || (printflags & PRINT_WHENCE_SIMPLE)) {
if (cn->flags & HASHED) {
zputs(cn->u.cmd, stdout);
putchar('\n');
} else {
zputs(*(cn->u.name), stdout);
putchar('/');
zputs(cn->nam, stdout);
putchar('\n');
}
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
if (cn->flags & HASHED) {
nicezputs(cn->nam, stdout);
printf(" is hashed to ");
nicezputs(cn->u.cmd, stdout);
putchar('\n');
} else {
nicezputs(cn->nam, stdout);
printf(" is ");
nicezputs(*(cn->u.name), stdout);
putchar('/');
nicezputs(cn->nam, stdout);
putchar('\n');
}
return;
}
if (cn->flags & HASHED) {
quotedzputs(cn->nam, stdout);
putchar('=');
quotedzputs(cn->u.cmd, stdout);
putchar('\n');
} else {
quotedzputs(cn->nam, stdout);
putchar('=');
quotedzputs(*(cn->u.name), stdout);
putchar('/');
quotedzputs(cn->nam, stdout);
putchar('\n');
}
}
/***************************************/
/* Shell Function Hash Table Functions */
/***************************************/
/* hash table containing the shell functions */
/**/
HashTable shfunctab;
/**/
void
createshfunctable(void)
{
shfunctab = newhashtable(7, "shfunctab", NULL);
shfunctab->hash = hasher;
shfunctab->emptytable = NULL;
shfunctab->filltable = NULL;
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(HashTable ht, char *nam)
{
HashNode hn;
if ((hn = removehashnode(shfunctab, nam))) {
if (!strncmp(hn->nam, "TRAP", 4))
unsettrap(getsignum(hn->nam + 4));
return hn;
} else
return NULL;
}
/* 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, int flags)
{
hn->flags |= DISABLED;
if (!strncmp(hn->nam, "TRAP", 4)) {
int signum = getsignum(hn->nam + 4);
sigtrapped[signum] &= ~ZSIG_FUNC;
sigfuncs[signum] = NULL;
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, int flags)
{
Shfunc shf = (Shfunc) hn;
int signum;
shf->flags &= ~DISABLED;
if (!strncmp(shf->nam, "TRAP", 4)) {
signum = getsignum(shf->nam + 4);
if (signum != -1) {
settrap(signum, shf->funcdef);
sigtrapped[signum] |= ZSIG_FUNC;
}
}
}
/**/
static void
freeshfuncnode(HashNode hn)
{
Shfunc shf = (Shfunc) hn;
zsfree(shf->nam);
if (shf->funcdef)
freestruct(shf->funcdef);
zfree(shf, sizeof(struct shfunc));
}
/* Print a shell function */
/**/
static void
printshfuncnode(HashNode hn, int printflags)
{
Shfunc f = (Shfunc) hn;
char *t;
if ((printflags & PRINT_NAMEONLY) ||
((printflags & PRINT_WHENCE_SIMPLE) &&
!(printflags & PRINT_WHENCE_FUNCDEF))) {
zputs(f->nam, stdout);
putchar('\n');
return;
}
if ((printflags & (PRINT_WHENCE_VERBOSE|PRINT_WHENCE_WORD)) &&
!(printflags & PRINT_WHENCE_FUNCDEF)) {
nicezputs(f->nam, stdout);
printf((printflags & PRINT_WHENCE_WORD) ? ": function\n" :
" is a shell function\n");
return;
}
if (f->flags & PM_UNDEFINED)
printf("undefined ");
if (f->flags & PM_TAGGED)
printf("traced ");
if ((f->flags & PM_UNDEFINED) || !f->funcdef) {
nicezputs(f->nam, stdout);
printf(" () { }\n");
return;
}
t = getpermtext((void *) dupstruct((void *) f->funcdef));
quotedzputs(f->nam, stdout);
printf(" () {\n\t");
zputs(t, stdout);
printf("\n}\n");
zsfree(t);
}
/**************************************/
/* 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, "do", 0, DO},
{NULL, "done", 0, DONE},
{NULL, "elif", 0, ELIF},
{NULL, "else", 0, ELSE},
{NULL, "end", 0, ZEND},
{NULL, "esac", 0, ESAC},
{NULL, "fi", 0, FI},
{NULL, "for", 0, FOR},
{NULL, "foreach", 0, FOREACH},
{NULL, "function", 0, FUNC},
{NULL, "if", 0, IF},
{NULL, "nocorrect", 0, NOCORRECT},
{NULL, "repeat", 0, REPEAT},
{NULL, "select", 0, SELECT},
{NULL, "then", 0, THEN},
{NULL, "time", 0, TIME},
{NULL, "until", 0, UNTIL},
{NULL, "while", 0, WHILE},
{NULL, NULL}
};
/* hash table containing the reserved words */
/**/
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->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->nam; rw++)
reswdtab->addnode(reswdtab, rw->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->nam);
return;
}
if (printflags & PRINT_WHENCE_CSH) {
printf("%s: shell reserved word\n", rw->nam);
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
printf("%s is a reserved word\n", rw->nam);
return;
}
/* default is name only */
printf("%s\n", rw->nam);
}
/********************************/
/* Aliases Hash Table Functions */
/********************************/
/* hash table containing the aliases */
/**/
HashTable aliastab;
/* Create new hash table for aliases */
/**/
void
createaliastable(void)
{
aliastab = newhashtable(23, "aliastab", NULL);
aliastab->hash = hasher;
aliastab->emptytable = NULL;
aliastab->filltable = NULL;
aliastab->addnode = addhashnode;
aliastab->getnode = gethashnode;
aliastab->getnode2 = gethashnode2;
aliastab->removenode = removehashnode;
aliastab->disablenode = disablehashnode;
aliastab->enablenode = enablehashnode;
aliastab->freenode = freealiasnode;
aliastab->printnode = printaliasnode;
/* add the default aliases */
aliastab->addnode(aliastab, ztrdup("run-help"), createaliasnode(ztrdup("man"), 0));
aliastab->addnode(aliastab, ztrdup("which-command"), createaliasnode(ztrdup("whence"), 0));
}
/* Create a new alias node */
/**/
Alias
createaliasnode(char *txt, int flags)
{
Alias al;
al = (Alias) zcalloc(sizeof *al);
al->flags = flags;
al->text = txt;
al->inuse = 0;
return al;
}
/**/
static void
freealiasnode(HashNode hn)
{
Alias al = (Alias) hn;
zsfree(al->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->nam, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_WORD) {
printf("%s: alias\n", a->nam);
return;
}
if (printflags & PRINT_WHENCE_SIMPLE) {
zputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_CSH) {
nicezputs(a->nam, stdout);
if (a->flags & ALIAS_GLOBAL)
printf(": globally aliased to ");
else
printf(": aliased to ");
nicezputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_WHENCE_VERBOSE) {
nicezputs(a->nam, stdout);
if (a->flags & ALIAS_GLOBAL)
printf(" is a global alias for ");
else
printf(" is an alias for ");
nicezputs(a->text, stdout);
putchar('\n');
return;
}
if (printflags & PRINT_LIST) {
printf("alias ");
if (a->flags & ALIAS_GLOBAL)
printf("-g ");
/* If an alias begins with `-', then we must output `-- ' *
* first, so that it is not interpreted as an option. */
if(a->nam[0] == '-')
printf("-- ");
}
quotedzputs(a->nam, stdout);
putchar('=');
quotedzputs(a->text, stdout);
putchar('\n');
}
/**********************************/
/* Parameter Hash Table Functions */
/**********************************/
/**/
void
freeparamnode(HashNode hn)
{
Param pm = (Param) hn;
zsfree(pm->nam);
zfree(pm, sizeof(struct param));
}
/* Print a parameter */
/**/
void
printparamnode(HashNode hn, int printflags)
{
Param p = (Param) hn;
char *t, **u;
if (p->flags & PM_UNSET)
return;
/* Print the attributes of the parameter */
if (printflags & PRINT_TYPE) {
if (p->flags & PM_INTEGER)
printf("integer ");
if (p->flags & PM_ARRAY)
printf("array ");
if (p->flags & PM_LEFT)
printf("left justified %d ", p->ct);
if (p->flags & PM_RIGHT_B)
printf("right justified %d ", p->ct);
if (p->flags & PM_RIGHT_Z)
printf("zero filled %d ", p->ct);
if (p->flags & PM_LOWER)
printf("lowercase ");
if (p->flags & PM_UPPER)
printf("uppercase ");
if (p->flags & PM_READONLY)
printf("readonly ");
if (p->flags & PM_TAGGED)
printf("tagged ");
if (p->flags & PM_EXPORTED)
printf("exported ");
}
if (printflags & PRINT_NAMEONLY) {
zputs(p->nam, stdout);
putchar('\n');
return;
}
/* How the value is displayed depends *
* on the type of the parameter */
quotedzputs(p->nam, stdout);
putchar('=');
switch (PM_TYPE(p->flags)) {
case PM_SCALAR:
/* string: simple output */
if (p->gets.cfn && (t = p->gets.cfn(p)))
quotedzputs(t, stdout);
putchar('\n');
break;
case PM_INTEGER:
/* integer */
printf("%ld\n", p->gets.ifn(p));
break;
case PM_ARRAY:
/* array */
putchar('(');
u = p->gets.afn(p);
if(*u) {
quotedzputs(*u++, stdout);
while (*u) {
putchar(' ');
quotedzputs(*u++, stdout);
}
}
printf(")\n");
break;
}
}
/****************************************/
/* Named Directory Hash Table Functions */
/****************************************/
/* hash table containing named directories */
/**/
HashTable nameddirtab;
/* != 0 if all the usernames have already been *
* added to the named directory hash table. */
static int allusersadded;
/* Create new hash table for named directories */
/**/
void
createnameddirtable(void)
{
nameddirtab = newhashtable(201, "nameddirtab", NULL);
nameddirtab->hash = hasher;
nameddirtab->emptytable = emptynameddirtable;
nameddirtab->filltable = fillnameddirtable;
nameddirtab->addnode = addnameddirnode;
nameddirtab->getnode = gethashnode;
nameddirtab->getnode2 = gethashnode2;
nameddirtab->removenode = removenameddirnode;
nameddirtab->disablenode = NULL;
nameddirtab->enablenode = NULL;
nameddirtab->freenode = freenameddirnode;
nameddirtab->printnode = printnameddirnode;
allusersadded = 0;
finddir(NULL); /* clear the finddir cache */
}
/* Empty the named directories table */
/**/
static void
emptynameddirtable(HashTable ht)
{
emptyhashtable(ht);
allusersadded = 0;
finddir(NULL); /* clear the finddir cache */
}
/* Add all the usernames in the password file/database *
* to the named directories table. */
/**/
static void
fillnameddirtable(HashTable ht)
{
#ifdef HAVE_GETPWENT
if (!allusersadded) {
struct passwd *pw;
setpwent();
/* loop through the password file/database *
* and add all entries returned. */
while ((pw = getpwent()) && !errflag)
adduserdir(ztrdup(pw->pw_name), pw->pw_dir, ND_USERNAME, 1);
endpwent();
allusersadded = 1;
}
return;
#endif /* HAVE_GETPWENT */
}
/* Add an entry to the named directory hash *
* table, clearing the finddir() cache and *
* initialising the `diff' member. */
/**/
static void
addnameddirnode(HashTable ht, char *nam, void *nodeptr)
{
Nameddir nd = (Nameddir) nodeptr;
nd->diff = strlen(nd->dir) - strlen(nam);
finddir(NULL); /* clear the finddir cache */
addhashnode(ht, nam, nodeptr);
}
/* Remove an entry from the named directory *
* hash table, clearing the finddir() cache. */
/**/
static HashNode
removenameddirnode(HashTable ht, char *nam)
{
HashNode hn = removehashnode(ht, nam);
if(hn)
finddir(NULL); /* clear the finddir cache */
return hn;
}
/* Free up the memory used by a named directory hash node. */
/**/
static void
freenameddirnode(HashNode hn)
{
Nameddir nd = (Nameddir) hn;
zsfree(nd->nam);
zsfree(nd->dir);
zfree(nd, sizeof(struct nameddir));
}
/* Print a named directory */
/**/
static void
printnameddirnode(HashNode hn, int printflags)
{
Nameddir nd = (Nameddir) hn;
if (printflags & PRINT_NAMEONLY) {
zputs(nd->nam, stdout);
putchar('\n');
return;
}
quotedzputs(nd->nam, stdout);
putchar('=');
quotedzputs(nd->dir, stdout);
putchar('\n');
}
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