4.4BSD/usr/src/contrib/xns/examples/filing_client/glob.c
/* $Header: glob.c,v 2.0 85/11/21 07:22:47 jqj Exp $ */
/*
* $Log: glob.c,v $
* Revision 2.0 85/11/21 07:22:47 jqj
* 4.3BSD standard release
*
* Revision 1.2 85/11/21 07:04:29 jqj
* added RCS header line
*
*/
#ifndef lint
static char sccsid[] = "@(#)glob.c 4.2 3/1/83";
#endif
/*
* C-shell glob for random programs.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/dir.h>
#include <stdio.h>
#include <errno.h>
#include <pwd.h>
#define QUOTE 0200
#define TRIM 0177
#define eq(a,b) (strcmp(a, b)==0)
#define GAVSIZ (NCARGS/6)
#define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR)
static char **gargv; /* Pointer to the (stack) arglist */
static short gargc; /* Number args in gargv */
static short gnleft;
static short gflag;
static int tglob();
char **glob();
char *globerr;
char *home;
struct passwd *getpwnam();
extern int errno;
static char *strspl(), **copyblk(), *strend();
char *malloc(), *strcpy(), *strcat();
static int globcnt;
char *globchars = "`{[*?";
static char *gpath, *gpathp, *lastgpathp;
static int globbed;
static char *entp;
static char **sortbas;
char **
glob(v)
register char *v;
{
char agpath[BUFSIZ];
char *agargv[GAVSIZ];
char *vv[2];
vv[0] = v;
vv[1] = 0;
gflag = 0;
rscan(vv, tglob);
if (gflag == 0)
return (copyblk(vv));
globerr = 0;
gpath = agpath; gpathp = gpath; *gpathp = 0;
lastgpathp = &gpath[sizeof agpath - 2];
ginit(agargv); globcnt = 0;
collect(v);
if (globcnt == 0 && (gflag&1)) {
blkfree(gargv), gargv = 0;
return (0);
} else
return (gargv = copyblk(gargv));
}
static
ginit(agargv)
char **agargv;
{
agargv[0] = 0; gargv = agargv; sortbas = agargv; gargc = 0;
gnleft = NCARGS - 4;
}
static
collect(as)
register char *as;
{
if (eq(as, "{") || eq(as, "{}")) {
Gcat(as, "");
sort();
} else
acollect(as);
}
static
acollect(as)
register char *as;
{
register int ogargc = gargc;
gpathp = gpath; *gpathp = 0; globbed = 0;
expand(as);
if (gargc != ogargc)
sort();
}
static
sort()
{
register char **p1, **p2, *c;
char **Gvp = &gargv[gargc];
p1 = sortbas;
while (p1 < Gvp-1) {
p2 = p1;
while (++p2 < Gvp)
if (strcmp(*p1, *p2) > 0)
c = *p1, *p1 = *p2, *p2 = c;
p1++;
}
sortbas = Gvp;
}
static
expand(as)
char *as;
{
register char *cs;
register char *sgpathp, *oldcs;
struct stat stb;
sgpathp = gpathp;
cs = as;
if (*cs == '~' && gpathp == gpath) {
addpath('~');
for (cs++; letter(*cs) || digit(*cs) || *cs == '-';)
addpath(*cs++);
if (!*cs || *cs == '/') {
if (gpathp != gpath + 1) {
*gpathp = 0;
if (gethdir(gpath + 1))
globerr = "Unknown user name after ~";
strcpy(gpath, gpath + 1);
} else
strcpy(gpath, home);
gpathp = strend(gpath);
}
}
while (!any(*cs, globchars)) {
if (*cs == 0) {
if (!globbed)
Gcat(gpath, "");
else if (stat(gpath, &stb) >= 0) {
Gcat(gpath, "");
globcnt++;
}
goto endit;
}
addpath(*cs++);
}
oldcs = cs;
while (cs > as && *cs != '/')
cs--, gpathp--;
if (*cs == '/')
cs++, gpathp++;
*gpathp = 0;
if (*oldcs == '{') {
execbrc(cs, ((char *)0));
return;
}
matchdir(cs);
endit:
gpathp = sgpathp;
*gpathp = 0;
}
static
matchdir(pattern)
char *pattern;
{
struct stat stb;
register struct direct *dp;
DIR *dirp;
register int cnt;
dirp = opendir(gpath);
if (dirp == NULL) {
if (globbed)
return;
goto patherr2;
}
if (fstat(dirp->dd_fd, &stb) < 0)
goto patherr1;
if (!isdir(stb)) {
errno = ENOTDIR;
goto patherr1;
}
while ((dp = readdir(dirp)) != NULL) {
if (dp->d_ino == 0)
continue;
if (match(dp->d_name, pattern)) {
Gcat(gpath, dp->d_name);
globcnt++;
}
}
closedir(dirp);
return;
patherr1:
closedir(dirp);
patherr2:
globerr = "Bad directory components";
}
static
execbrc(p, s)
char *p, *s;
{
char restbuf[BUFSIZ + 2];
register char *pe, *pm, *pl;
int brclev = 0;
char *lm, savec, *sgpathp;
for (lm = restbuf; *p != '{'; *lm++ = *p++)
continue;
for (pe = ++p; *pe; pe++)
switch (*pe) {
case '{':
brclev++;
continue;
case '}':
if (brclev == 0)
goto pend;
brclev--;
continue;
case '[':
for (pe++; *pe && *pe != ']'; pe++)
continue;
continue;
}
pend:
brclev = 0;
for (pl = pm = p; pm <= pe; pm++)
switch (*pm & (QUOTE|TRIM)) {
case '{':
brclev++;
continue;
case '}':
if (brclev) {
brclev--;
continue;
}
goto doit;
case ','|QUOTE:
case ',':
if (brclev)
continue;
doit:
savec = *pm;
*pm = 0;
strcpy(lm, pl);
strcat(restbuf, pe + 1);
*pm = savec;
if (s == 0) {
sgpathp = gpathp;
expand(restbuf);
gpathp = sgpathp;
*gpathp = 0;
} else if (amatch(s, restbuf))
return (1);
sort();
pl = pm + 1;
if (brclev)
return (0);
continue;
case '[':
for (pm++; *pm && *pm != ']'; pm++)
continue;
if (!*pm)
pm--;
continue;
}
if (brclev)
goto doit;
return (0);
}
static
match(s, p)
char *s, *p;
{
register int c;
register char *sentp;
char sglobbed = globbed;
if (*s == '.' && *p != '.')
return (0);
sentp = entp;
entp = s;
c = amatch(s, p);
entp = sentp;
globbed = sglobbed;
return (c);
}
static
amatch(s, p)
register char *s, *p;
{
register int scc;
int ok, lc;
char *sgpathp;
struct stat stb;
int c, cc;
globbed = 1;
for (;;) {
scc = *s++ & TRIM;
switch (c = *p++) {
case '{':
return (execbrc(p - 1, s - 1));
case '[':
ok = 0;
lc = 077777;
while (cc = *p++) {
if (cc == ']') {
if (ok)
break;
return (0);
}
if (cc == '-') {
if (lc <= scc && scc <= *p++)
ok++;
} else
if (scc == (lc = cc))
ok++;
}
if (cc == 0)
if (ok)
p--;
else
return 0;
continue;
case '*':
if (!*p)
return (1);
if (*p == '/') {
p++;
goto slash;
}
s--;
do {
if (amatch(s, p))
return (1);
} while (*s++);
return (0);
case 0:
return (scc == 0);
default:
if (c != scc)
return (0);
continue;
case '?':
if (scc == 0)
return (0);
continue;
case '/':
if (scc)
return (0);
slash:
s = entp;
sgpathp = gpathp;
while (*s)
addpath(*s++);
addpath('/');
if (stat(gpath, &stb) == 0 && isdir(stb))
if (*p == 0) {
Gcat(gpath, "");
globcnt++;
} else
expand(p);
gpathp = sgpathp;
*gpathp = 0;
return (0);
}
}
}
static
Gmatch(s, p)
register char *s, *p;
{
register int scc;
int ok, lc;
int c, cc;
for (;;) {
scc = *s++ & TRIM;
switch (c = *p++) {
case '[':
ok = 0;
lc = 077777;
while (cc = *p++) {
if (cc == ']') {
if (ok)
break;
return (0);
}
if (cc == '-') {
if (lc <= scc && scc <= *p++)
ok++;
} else
if (scc == (lc = cc))
ok++;
}
if (cc == 0)
if (ok)
p--;
else
return 0;
continue;
case '*':
if (!*p)
return (1);
for (s--; *s; s++)
if (Gmatch(s, p))
return (1);
return (0);
case 0:
return (scc == 0);
default:
if ((c & TRIM) != scc)
return (0);
continue;
case '?':
if (scc == 0)
return (0);
continue;
}
}
}
static
Gcat(s1, s2)
register char *s1, *s2;
{
register int len = strlen(s1) + strlen(s2) + 1;
if (len >= gnleft || gargc >= GAVSIZ - 1)
globerr = "Arguments too long";
else {
gargc++;
gnleft -= len;
gargv[gargc] = 0;
gargv[gargc - 1] = strspl(s1, s2);
}
}
static
addpath(c)
char c;
{
if (gpathp >= lastgpathp)
globerr = "Pathname too long";
else {
*gpathp++ = c;
*gpathp = 0;
}
}
static
rscan(t, f)
register char **t;
int (*f)();
{
register char *p, c;
while (p = *t++) {
if (f == tglob)
if (*p == '~')
gflag |= 2;
else if (eq(p, "{") || eq(p, "{}"))
continue;
while (c = *p++)
(*f)(c);
}
}
static
scan(t, f)
register char **t;
int (*f)();
{
register char *p, c;
while (p = *t++)
while (c = *p)
*p++ = (*f)(c);
}
static
tglob(c)
register char c;
{
if (any(c, globchars))
gflag |= c == '{' ? 2 : 1;
return (c);
}
static
trim(c)
char c;
{
return (c & TRIM);
}
letter(c)
register char c;
{
return (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '_');
}
digit(c)
register char c;
{
return (c >= '0' && c <= '9');
}
any(c, s)
register int c;
register char *s;
{
while (*s)
if (*s++ == c)
return(1);
return(0);
}
blklen(av)
register char **av;
{
register int i = 0;
while (*av++)
i++;
return (i);
}
char **
blkcpy(oav, bv)
char **oav;
register char **bv;
{
register char **av = oav;
while (*av++ = *bv++)
continue;
return (oav);
}
blkfree(av0)
char **av0;
{
register char **av = av0;
while (*av)
free(*av++);
free((char *)av0);
}
static
char *
strspl(cp, dp)
register char *cp, *dp;
{
register char *ep = malloc((unsigned)(strlen(cp) + strlen(dp) + 1));
if (ep == (char *)0)
fatal("Out of memory");
strcpy(ep, cp);
strcat(ep, dp);
return (ep);
}
static
char **
copyblk(v)
register char **v;
{
register char **nv = (char **)malloc((unsigned)((blklen(v) + 1) *
sizeof(char **)));
if (nv == (char **)0)
fatal("Out of memory");
return (blkcpy(nv, v));
}
static
char *
strend(cp)
register char *cp;
{
while (*cp)
cp++;
return (cp);
}
/*
* Extract a home directory from the password file
* The argument points to a buffer where the name of the
* user whose home directory is sought is currently.
* We write the home directory of the user back there.
*/
gethdir(home)
char *home;
{
register struct passwd *pp = getpwnam(home);
if (pp == 0)
return (1);
strcpy(home, pp->pw_dir);
return (0);
}