605 lines
11 KiB
C
605 lines
11 KiB
C
/* $NetBSD: expand.c,v 1.18 2009/07/14 21:05:34 apb Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
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#else
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__RCSID("$NetBSD: expand.c,v 1.18 2009/07/14 21:05:34 apb Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <errno.h>
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#include <pwd.h>
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#include "defs.h"
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#define GAVSIZ NCARGS / 6
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#define LC '{'
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#define RC '}'
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static char shchars[] = "${[*?";
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int which; /* bit mask of types to expand */
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int eargc; /* expanded arg count */
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char **eargv; /* expanded arg vectors */
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char *path;
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char *pathp;
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char *lastpathp;
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const char *tilde; /* "~user" if not expanding tilde, else "" */
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char *tpathp;
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int nleft;
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int expany; /* any expansions done? */
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char *entp;
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char **sortbase;
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#define sort() qsort((char *)sortbase, &eargv[eargc] - sortbase, \
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sizeof(*sortbase), argcmp), sortbase = &eargv[eargc]
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static void Cat(const char *, const char *);
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static void addpath(int);
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static int amatch(char *, char *);
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static int argcmp(const void *, const void *);
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static int execbrc(char *, char *);
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static void expsh(char *);
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static void expstr(char *);
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static int match(char *, char *);
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static void matchdir(char *);
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/*
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* Take a list of names and expand any macros, etc.
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* wh = E_VARS if expanding variables.
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* wh = E_SHELL if expanding shell characters.
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* wh = E_TILDE if expanding `~'.
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* or any of these or'ed together.
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*
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* Major portions of this were snarfed from csh/sh.glob.c.
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*/
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struct namelist *
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expand(struct namelist *list, int wh)
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{
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struct namelist *nl, *prev;
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int n;
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char pathbuf[BUFSIZ];
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char *argvbuf[GAVSIZ];
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if (debug) {
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printf("expand(%lx, %d)\nlist = ", (long)list, wh);
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prnames(list);
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}
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if (wh == 0) {
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char *cp;
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for (nl = list; nl != NULL; nl = nl->n_next)
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for (cp = nl->n_name; *cp; cp++)
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*cp = *cp & TRIM;
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return(list);
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}
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which = wh;
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path = tpathp = pathp = pathbuf;
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*pathp = '\0';
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lastpathp = &path[sizeof pathbuf - 2];
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tilde = "";
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eargc = 0;
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eargv = sortbase = argvbuf;
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*eargv = 0;
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nleft = NCARGS - 4;
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/*
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* Walk the name list and expand names into eargv[];
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*/
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for (nl = list; nl != NULL; nl = nl->n_next)
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expstr(nl->n_name);
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/*
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* Take expanded list of names from eargv[] and build a new list.
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*/
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list = prev = NULL;
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for (n = 0; n < eargc; n++) {
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nl = makenl(NULL);
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nl->n_name = eargv[n];
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if (prev == NULL)
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list = prev = nl;
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else {
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prev->n_next = nl;
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prev = nl;
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}
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}
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if (debug) {
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printf("expanded list = ");
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prnames(list);
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}
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return(list);
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}
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static void
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expstr(char *s)
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{
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char *cp, *cp1;
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struct namelist *tp;
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char *tail;
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char expbuf[BUFSIZ];
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int savec, oeargc;
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extern char homedir[];
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if (s == NULL || *s == '\0')
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return;
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if ((which & E_VARS) && (cp = strchr(s, '$')) != NULL) {
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*cp++ = '\0';
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if (*cp == '\0') {
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yyerror("no variable name after '$'");
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return;
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}
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if (*cp == LC) {
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cp++;
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if ((tail = strchr(cp, RC)) == NULL) {
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yyerror("unmatched '{'");
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return;
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}
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*tail++ = savec = '\0';
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if (*cp == '\0') {
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yyerror("no variable name after '$'");
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return;
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}
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} else {
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tail = cp + 1;
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savec = *tail;
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*tail = '\0';
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}
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tp = lookup(cp, 0, 0);
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if (savec != '\0')
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*tail = savec;
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if (tp != NULL) {
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for (; tp != NULL; tp = tp->n_next) {
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snprintf(expbuf, sizeof(expbuf), "%s%s%s", s,
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tp->n_name, tail);
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expstr(expbuf);
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}
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return;
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}
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snprintf(expbuf, sizeof(expbuf), "%s%s", s, tail);
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expstr(expbuf);
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return;
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}
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if ((which & ~E_VARS) == 0 || !strcmp(s, "{") || !strcmp(s, "{}")) {
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Cat(s, "");
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sort();
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return;
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}
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if (*s == '~') {
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cp = ++s;
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if (*cp == '\0' || *cp == '/') {
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tilde = "~";
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cp1 = homedir;
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} else {
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tilde = cp1 = expbuf;
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*cp1++ = '~';
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do
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*cp1++ = *cp++;
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while (*cp && *cp != '/');
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*cp1 = '\0';
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if (pw == NULL || strcmp(pw->pw_name, expbuf+1) != 0) {
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if ((pw = getpwnam(expbuf+1)) == NULL) {
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strlcat(expbuf, ": unknown user name",
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sizeof(expbuf));
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yyerror(expbuf+1);
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return;
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}
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}
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cp1 = pw->pw_dir;
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s = cp;
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}
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for (cp = path; (*cp++ = *cp1++) != 0; )
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;
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tpathp = pathp = cp - 1;
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} else {
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tpathp = pathp = path;
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tilde = "";
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}
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*pathp = '\0';
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if (!(which & E_SHELL)) {
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if (which & E_TILDE)
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Cat(path, s);
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else
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Cat(tilde, s);
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sort();
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return;
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}
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oeargc = eargc;
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expany = 0;
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expsh(s);
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if (eargc == oeargc)
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Cat(s, ""); /* "nonomatch" is set */
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sort();
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}
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static int
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argcmp(const void *a1, const void *a2)
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{
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return (strcmp(*(const char * const *)a1, *(const char * const *)a2));
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}
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/*
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* If there are any Shell meta characters in the name,
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* expand into a list, after searching directory
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*/
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static void
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expsh(char *s)
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{
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char *cp;
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char *spathp, *oldcp;
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struct stat stb;
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spathp = pathp;
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cp = s;
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while (!any(*cp, shchars)) {
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if (*cp == '\0') {
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if (!expany || stat(path, &stb) >= 0) {
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if (which & E_TILDE)
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Cat(path, "");
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else
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Cat(tilde, tpathp);
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}
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goto endit;
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}
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addpath(*cp++);
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}
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oldcp = cp;
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while (cp > s && *cp != '/')
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cp--, pathp--;
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if (*cp == '/')
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cp++, pathp++;
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*pathp = '\0';
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if (*oldcp == '{') {
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execbrc(cp, NULL);
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return;
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}
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matchdir(cp);
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endit:
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pathp = spathp;
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*pathp = '\0';
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}
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static void
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matchdir(char *pattern)
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{
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struct stat stb;
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struct dirent *dp;
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DIR *dirp;
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dirp = opendir(path);
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if (dirp == NULL) {
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if (expany)
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return;
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goto patherr2;
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}
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if (fstat(dirp->dd_fd, &stb) < 0)
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goto patherr1;
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if (!S_ISDIR(stb.st_mode)) {
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errno = ENOTDIR;
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goto patherr1;
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}
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while ((dp = readdir(dirp)) != NULL)
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if (match(dp->d_name, pattern)) {
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if (which & E_TILDE)
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Cat(path, dp->d_name);
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else {
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strcpy(pathp, dp->d_name);
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Cat(tilde, tpathp);
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*pathp = '\0';
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}
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}
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closedir(dirp);
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return;
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patherr1:
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closedir(dirp);
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patherr2:
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strcat(path, ": ");
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strcat(path, strerror(errno));
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yyerror(path);
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}
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static int
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execbrc(char *p, char *s)
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{
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char restbuf[BUFSIZ + 2];
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char *pe, *pm, *pl;
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int brclev = 0;
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char *lm, savec, *spathp;
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for (lm = restbuf; *p != '{'; *lm++ = *p++)
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continue;
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for (pe = ++p; *pe; pe++)
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switch (*pe) {
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case '{':
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brclev++;
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continue;
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case '}':
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if (brclev == 0)
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goto pend;
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brclev--;
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continue;
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case '[':
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for (pe++; *pe && *pe != ']'; pe++)
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continue;
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if (!*pe)
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yyerror("Missing ']'");
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continue;
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}
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pend:
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if (brclev || !*pe) {
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yyerror("Missing '}'");
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return (0);
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}
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for (pl = pm = p; pm <= pe; pm++)
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switch (*pm & (QUOTE|TRIM)) {
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case '{':
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brclev++;
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continue;
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case '}':
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if (brclev) {
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brclev--;
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continue;
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}
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goto doit;
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case ',':
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if (brclev)
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continue;
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doit:
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savec = *pm;
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*pm = 0;
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strlcpy(lm, pl, sizeof(restbuf) - (lm - restbuf));
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strlcat(restbuf, pe + 1, sizeof(restbuf));
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*pm = savec;
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if (s == 0) {
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spathp = pathp;
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expsh(restbuf);
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pathp = spathp;
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*pathp = 0;
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} else if (amatch(s, restbuf))
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return (1);
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sort();
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pl = pm + 1;
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continue;
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case '[':
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for (pm++; *pm && *pm != ']'; pm++)
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continue;
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if (!*pm)
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yyerror("Missing ']'");
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continue;
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}
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return (0);
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}
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static int
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match(char *s, char *p)
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{
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int c;
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char *sentp;
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char sexpany = expany;
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if (*s == '.' && *p != '.')
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return (0);
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sentp = entp;
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entp = s;
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c = amatch(s, p);
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entp = sentp;
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expany = sexpany;
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return (c);
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}
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static int
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amatch(char *s, char *p)
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{
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int scc;
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int ok, lc;
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char *spathp;
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struct stat stb;
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int c, cc;
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expany = 1;
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for (;;) {
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scc = *s++ & TRIM;
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switch (c = *p++) {
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case '{':
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return (execbrc(p - 1, s - 1));
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case '[':
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ok = 0;
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lc = 077777;
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while ((cc = *p++) != 0) {
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if (cc == ']') {
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if (ok)
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break;
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return (0);
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}
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if (cc == '-') {
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if (lc <= scc && scc <= *p++)
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ok++;
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} else
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if (scc == (lc = cc))
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ok++;
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}
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if (cc == 0) {
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yyerror("Missing ']'");
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return (0);
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}
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continue;
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case '*':
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if (!*p)
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return (1);
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if (*p == '/') {
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p++;
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goto slash;
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}
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for (s--; *s; s++)
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if (amatch(s, p))
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return (1);
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return (0);
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case '\0':
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return (scc == '\0');
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default:
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if ((c & TRIM) != scc)
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return (0);
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continue;
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case '?':
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if (scc == '\0')
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return (0);
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continue;
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case '/':
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if (scc)
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return (0);
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slash:
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s = entp;
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spathp = pathp;
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while (*s)
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addpath(*s++);
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addpath('/');
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if (stat(path, &stb) == 0 && S_ISDIR(stb.st_mode)) {
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if (*p == '\0') {
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if (which & E_TILDE)
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Cat(path, "");
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else
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Cat(tilde, tpathp);
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} else
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expsh(p);
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}
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pathp = spathp;
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*pathp = '\0';
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return (0);
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}
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}
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}
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static void
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Cat(const char *s1, const char *s2)
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{
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int len = strlen(s1) + strlen(s2) + 1;
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char *s;
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nleft -= len;
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if (nleft <= 0 || ++eargc >= GAVSIZ)
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yyerror("Arguments too long");
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eargv[eargc] = 0;
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eargv[eargc - 1] = s = malloc(len);
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if (s == NULL)
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fatal("ran out of memory\n");
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while ((*s++ = *s1++ & TRIM) != 0)
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;
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s--;
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while ((*s++ = *s2++ & TRIM) != 0)
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;
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}
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static void
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addpath(int c)
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{
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if (pathp >= lastpathp)
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yyerror("Pathname too long");
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else {
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*pathp++ = c & TRIM;
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*pathp = '\0';
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}
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}
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/*
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* Expand file names beginning with `~' into the
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* user's home directory path name. Return a pointer in buf to the
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* part corresponding to `file'.
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*/
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char *
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exptilde(char *expbuf, char *file)
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{
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char *s1, *s2, *s3;
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extern char homedir[];
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if (*file != '~') {
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strcpy(expbuf, file);
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return(expbuf);
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}
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if (*++file == '\0') {
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s2 = homedir;
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s3 = NULL;
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} else if (*file == '/') {
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s2 = homedir;
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s3 = file;
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} else {
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s3 = file;
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while (*s3 && *s3 != '/')
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s3++;
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if (*s3 == '/')
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*s3 = '\0';
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else
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s3 = NULL;
|
|
if (pw == NULL || strcmp(pw->pw_name, file) != 0) {
|
|
if ((pw = getpwnam(file)) == NULL) {
|
|
error("%s: unknown user name\n", file);
|
|
if (s3 != NULL)
|
|
*s3 = '/';
|
|
return(NULL);
|
|
}
|
|
}
|
|
if (s3 != NULL)
|
|
*s3 = '/';
|
|
s2 = pw->pw_dir;
|
|
}
|
|
for (s1 = expbuf; (*s1++ = *s2++) != 0; )
|
|
;
|
|
s2 = --s1;
|
|
if (s3 != NULL) {
|
|
s2++;
|
|
while ((*s1++ = *s3++) != 0)
|
|
;
|
|
}
|
|
return(s2);
|
|
}
|