NetBSD/usr.sbin/sup/source/expand.c

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/* $NetBSD: expand.c,v 1.12 1998/11/02 04:00:24 kim Exp $ */
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/*
* Copyright (c) 1991 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the rights
* to redistribute these changes.
*/
/*
* expand - expand wildcard filename specifications
*
* Usage:
* int expand(spec, buffer, bufsize);
* char *spec, **buffer;
* int bufsize;
*
* Expand takes a file specification, and expands it into filenames
* by resolving the characters '*', '?', '[', ']', '{', '}' and '~'
* in the same manner as the shell. You provide "buffer", which is
* an array of char *'s, and you tell how big it is in bufsize.
* Expand will compute the corresponding filenames, and will fill up
* the entries of buffer with pointers to malloc'd strings.
*
* The value returned by expand is the number of filenames found. If
* this value is -1, then malloc failed to allocate a string. If the
* value is bufsize + 1, then too many names were found and you can try
* again with a bigger buffer.
*
* This routine was basically created from the csh sh.glob.c file with
* the following intended differences:
*
* Filenames are not sorted.
* All expanded filenames returned exist.
*
**********************************************************************
* HISTORY
* 13-Nov-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Replaced a stat() with lstat() and changed glob() to only call
* matchdir() for directories.
*
* 20-Oct-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Created from csh glob() function and 4.1 expand() function.
*
**********************************************************************
*/
#include <sys/param.h>
#include <sys/stat.h>
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#ifdef HAS_POSIX_DIR
#include <dirent.h>
#else
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#include <sys/dir.h>
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#endif
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#include <pwd.h>
#include <ctype.h>
#include <libc.h>
#include <setjmp.h>
#include <stdlib.h>
#include <unistd.h>
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static jmp_buf sjbuf;
static char pathbuf[MAXPATHLEN];
static char *path, *pathp, *lastpathp;
static char *globchars = "{[*?"; /* meta characters */
static char *entp; /* current dir entry pointer */
static char **BUFFER; /* pointer to the buffer */
static int BUFSIZE; /* maximum number in buffer */
static int bufcnt; /* current number in buffer */
#define fixit(a) (a[0] ? a : ".")
#ifndef __P
#ifdef __STDC__
#define __P(a) a
#else
#define __P(a) ()
#endif
#endif
int expand __P((char *, char **, int));
static void glob __P((char *));
static void matchdir __P((char *));
static int execbrc __P((char *, char *));
static int match __P((char *, char *));
static int amatch __P((char *, char *));
static void addone __P((char *, char *));
static int addpath __P((int));
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static int gethdir __P((char *, int));
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int expand(spec, buffer, bufsize)
register char *spec;
char **buffer;
int bufsize;
{
pathp = path = pathbuf;
*pathp = 0;
lastpathp = &path[MAXPATHLEN - 2];
BUFFER = buffer;
BUFSIZE = bufsize;
bufcnt = 0;
if (setjmp(sjbuf) == 0)
glob(spec);
return(bufcnt);
}
static void glob(as)
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char *as;
{
register char *cs;
register char *spathp, *oldcs;
struct stat stb;
spathp = pathp;
cs = as;
if (*cs == '~' && pathp == path) {
if (addpath('~')) goto endit;
for (cs++; isalnum(*cs) || *cs == '_' || *cs == '-';)
if (addpath(*cs++)) goto endit;
if (!*cs || *cs == '/') {
if (pathp != path + 1) {
*pathp = 0;
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if (gethdir(path + 1,sizeof path-1)) goto endit;
strncpy(path, path + 1, sizeof path-1);
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} else
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strncpy(path, (char *)getenv("HOME"), sizeof path-1);
path[sizeof path-1] = '\0';
pathp = path + strlen(path);
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}
}
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while (*cs == 0 || strchr(globchars, *cs) == 0) {
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if (*cs == 0) {
if (lstat(fixit(path), &stb) >= 0) addone(path, "");
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goto endit;
}
if (addpath(*cs++)) goto endit;
}
oldcs = cs;
while (cs > as && *cs != '/')
cs--, pathp--;
if (*cs == '/')
cs++, pathp++;
*pathp = 0;
if (*oldcs == '{') {
execbrc(cs, NULL);
return;
}
/* this should not be an lstat */
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if (stat(fixit(path), &stb) >= 0 && S_ISDIR(stb.st_mode))
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matchdir(cs);
endit:
pathp = spathp;
*pathp = 0;
return;
}
static void matchdir(pattern)
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char *pattern;
{
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#ifdef HAS_POSIX_DIR
register struct dirent *dp;
#else
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register struct direct *dp;
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#endif
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DIR *dirp;
dirp = opendir(fixit(path));
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if (dirp == NULL)
return;
while ((dp = readdir(dirp)) != NULL) {
#if defined(HAS_POSIX_DIR) && !defined(__SVR4)
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if (dp->d_fileno == 0) continue;
#else
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if (dp->d_ino == 0) continue;
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#endif
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if (match(dp->d_name, pattern))
addone(path, dp->d_name);
}
closedir(dirp);
return;
}
static int execbrc(p, s)
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char *p, *s;
{
char restbuf[MAXPATHLEN + 1];
register char *pe, *pm, *pl;
int brclev = 0;
char *lm, savec, *spathp;
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;
if (!*pe) break;
continue;
}
pend:
if (brclev || !*pe) return (0);
for (pl = pm = p; pm <= pe; pm++)
switch (*pm & 0177) {
case '{':
brclev++;
continue;
case '}':
if (brclev) {
brclev--;
continue;
}
goto doit;
case ',':
if (brclev) continue;
doit:
savec = *pm;
*pm = 0;
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snprintf(lm, sizeof(restbuf) - (lm - restbuf),
"%s%s", pl, pe + 1);
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*pm = savec;
if (s == 0) {
spathp = pathp;
glob(restbuf);
pathp = spathp;
*pathp = 0;
} else if (amatch(s, restbuf))
return (1);
pl = pm + 1;
continue;
case '[':
for (pm++; *pm && *pm != ']'; pm++)
continue;
if (!*pm) break;
continue;
}
return (0);
}
static int match(s, p)
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char *s, *p;
{
register int c;
register char *sentp;
if (*s == '.' && *p != '.') return(0);
sentp = entp;
entp = s;
c = amatch(s, p);
entp = sentp;
return (c);
}
static int amatch(s, p)
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register char *s, *p;
{
register int scc;
int ok, lc;
char *spathp;
struct stat stb;
int c, cc;
for (;;) {
scc = *s++ & 0177;
switch (c = *p++) {
case '{':
return (execbrc(p - 1, s - 1));
case '[':
ok = 0;
lc = 077777;
while ((cc = *p++) != 0) {
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if (cc == ']') {
if (ok) break;
return (0);
}
if (cc == '-') {
if (lc <= scc && scc <= *p++)
ok++;
} else
if (scc == (lc = cc))
ok++;
}
if (cc == 0) return (0);
continue;
case '*':
if (!*p) return (1);
if (*p == '/') {
p++;
goto slash;
}
for (s--; *s; s++)
if (amatch(s, p))
return (1);
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;
spathp = pathp;
while (*s)
if (addpath(*s++)) goto pathovfl;
if (addpath('/')) goto pathovfl;
if (stat(fixit(path), &stb) >= 0 &&
(stb.st_mode&S_IFMT) == S_IFDIR) {
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if (*p == 0)
addone(path, "");
else
glob(p);
}
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pathovfl:
pathp = spathp;
*pathp = 0;
return (0);
}
}
}
static void addone(s1, s2)
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register char *s1, *s2;
{
register char *ep;
if (bufcnt >= BUFSIZE) {
bufcnt = BUFSIZE + 1;
longjmp(sjbuf, 1);
}
ep = (char *)malloc(strlen(s1) + strlen(s2) + 1);
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if (ep == 0) {
bufcnt = -1;
longjmp(sjbuf, 1);
}
BUFFER[bufcnt++] = ep;
while (*s1) *ep++ = *s1++;
while ((*ep++ = *s2++) != '\0')
continue;
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}
static int addpath(c)
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char c;
{
if (pathp >= lastpathp)
return(1);
*pathp++ = c;
*pathp = 0;
return(0);
}
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static int gethdir(home,homelen)
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char *home;
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int homelen;
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{
register struct passwd *pp = getpwnam(home);
if (pp == 0)
return(1);
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strncpy(home, pp->pw_dir, homelen-1);
home[homelen-1] = '\0';
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return(0);
}