1160 lines
23 KiB
C
Executable File
1160 lines
23 KiB
C
Executable File
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char sccsid[] = "@(#)expand.c 5.1 (Berkeley) 3/7/91";
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#endif /* not lint */
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/*
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* Routines to expand arguments to commands. We have to deal with
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* backquotes, shell variables, and file metacharacters.
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*/
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#include "shell.h"
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#include "main.h"
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#include "nodes.h"
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#include "eval.h"
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#include "expand.h"
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#include "syntax.h"
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#include "parser.h"
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#include "jobs.h"
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#include "options.h"
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#include "var.h"
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#include "input.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "mystring.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <dirent.h>
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#if USEGETPW
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#include <pwd.h>
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#endif
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/*
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* Structure specifying which parts of the string should be searched
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* for IFS characters.
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*/
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struct ifsregion {
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struct ifsregion *next; /* next region in list */
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int begoff; /* offset of start of region */
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int endoff; /* offset of end of region */
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int nulonly; /* search for nul bytes only */
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};
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char *expdest; /* output of current string */
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struct nodelist *argbackq; /* list of back quote expressions */
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struct ifsregion ifsfirst; /* first struct in list of ifs regions */
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struct ifsregion *ifslastp; /* last struct in list */
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struct arglist exparg; /* holds expanded arg list */
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#if UDIR || TILDE
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/*
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* Set if the last argument processed had /u/logname or ~logname expanded.
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* This variable is read by the cd command.
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*/
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int didudir;
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#endif
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#ifdef __STDC__
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STATIC void argstr(char *, int);
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STATIC void expbackq(union node *, int, int);
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STATIC char *evalvar(char *, int);
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STATIC int varisset(int);
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STATIC void varvalue(int, int, int);
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STATIC void recordregion(int, int, int);
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STATIC void ifsbreakup(char *, struct arglist *);
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STATIC void expandmeta(struct strlist *);
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STATIC void expmeta(char *, char *);
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STATIC void addfname(char *);
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STATIC struct strlist *expsort(struct strlist *);
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STATIC struct strlist *msort(struct strlist *, int);
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STATIC int pmatch(char *, char *);
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#else
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STATIC void argstr();
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STATIC void expbackq();
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STATIC char *evalvar();
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STATIC int varisset();
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STATIC void varvalue();
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STATIC void recordregion();
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STATIC void ifsbreakup();
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STATIC void expandmeta();
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STATIC void expmeta();
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STATIC void addfname();
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STATIC struct strlist *expsort();
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STATIC struct strlist *msort();
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STATIC int pmatch();
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#endif
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#if UDIR || TILDE
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#ifdef __STDC__
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STATIC char *expudir(char *);
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#else
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STATIC char *expudir();
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#endif
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#endif /* UDIR || TILDE */
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/*
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* Expand shell variables and backquotes inside a here document.
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*/
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void
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expandhere(arg, fd)
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union node *arg; /* the document */
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int fd; /* where to write the expanded version */
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{
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herefd = fd;
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expandarg(arg, (struct arglist *)NULL, 0);
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xwrite(fd, stackblock(), expdest - stackblock());
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}
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/*
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* Perform variable substitution and command substitution on an argument,
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* placing the resulting list of arguments in arglist. If full is true,
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* perform splitting and file name expansion. When arglist is NULL, perform
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* here document expansion.
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*/
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void
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expandarg(arg, arglist, full)
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union node *arg;
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struct arglist *arglist;
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{
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struct strlist *sp;
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char *p;
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#if UDIR || TILDE
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didudir = 0;
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#endif
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argbackq = arg->narg.backquote;
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STARTSTACKSTR(expdest);
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ifsfirst.next = NULL;
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ifslastp = NULL;
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argstr(arg->narg.text, full);
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if (arglist == NULL)
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return; /* here document expanded */
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STPUTC('\0', expdest);
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p = grabstackstr(expdest);
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exparg.lastp = &exparg.list;
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if (full) {
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ifsbreakup(p, &exparg);
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*exparg.lastp = NULL;
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exparg.lastp = &exparg.list;
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expandmeta(exparg.list);
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} else {
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sp = (struct strlist *)stalloc(sizeof (struct strlist));
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sp->text = p;
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*exparg.lastp = sp;
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exparg.lastp = &sp->next;
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}
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while (ifsfirst.next != NULL) {
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struct ifsregion *ifsp;
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INTOFF;
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ifsp = ifsfirst.next->next;
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ckfree(ifsfirst.next);
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ifsfirst.next = ifsp;
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INTON;
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}
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*exparg.lastp = NULL;
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if (exparg.list) {
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*arglist->lastp = exparg.list;
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arglist->lastp = exparg.lastp;
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}
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}
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/*
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* Perform variable and command substitution. If full is set, output CTLESC
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* characters to allow for further processing. If full is not set, treat
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* $@ like $* since no splitting will be performed.
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*/
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STATIC void
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argstr(p, full)
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register char *p;
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{
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char c;
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for (;;) {
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switch (c = *p++) {
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case '\0':
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case CTLENDVAR:
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goto breakloop;
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case CTLESC:
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if (full)
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STPUTC(c, expdest);
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c = *p++;
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STPUTC(c, expdest);
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break;
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case CTLVAR:
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p = evalvar(p, full);
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break;
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case CTLBACKQ:
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case CTLBACKQ|CTLQUOTE:
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expbackq(argbackq->n, c & CTLQUOTE, full);
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argbackq = argbackq->next;
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break;
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default:
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STPUTC(c, expdest);
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}
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}
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breakloop:;
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}
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/*
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* Expand stuff in backwards quotes.
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*/
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STATIC void
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expbackq(cmd, quoted, full)
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union node *cmd;
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{
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struct backcmd in;
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int i;
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char buf[128];
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char *p;
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char *dest = expdest;
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struct ifsregion saveifs, *savelastp;
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struct nodelist *saveargbackq;
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char lastc;
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int startloc = dest - stackblock();
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char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
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int saveherefd;
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INTOFF;
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saveifs = ifsfirst;
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savelastp = ifslastp;
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saveargbackq = argbackq;
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saveherefd = herefd;
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herefd = -1;
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p = grabstackstr(dest);
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evalbackcmd(cmd, &in);
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ungrabstackstr(p, dest);
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ifsfirst = saveifs;
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ifslastp = savelastp;
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argbackq = saveargbackq;
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herefd = saveherefd;
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p = in.buf;
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lastc = '\0';
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for (;;) {
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if (--in.nleft < 0) {
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if (in.fd < 0)
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break;
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while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
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TRACE(("expbackq: read returns %d\n", i));
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if (i <= 0)
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break;
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p = buf;
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in.nleft = i - 1;
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}
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lastc = *p++;
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if (lastc != '\0') {
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if (full && syntax[lastc] == CCTL)
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STPUTC(CTLESC, dest);
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STPUTC(lastc, dest);
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}
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}
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if (lastc == '\n') {
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STUNPUTC(dest);
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}
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if (in.fd >= 0)
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close(in.fd);
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if (in.buf)
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ckfree(in.buf);
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if (in.jp)
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exitstatus = waitforjob(in.jp);
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if (quoted == 0)
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recordregion(startloc, dest - stackblock(), 0);
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TRACE(("evalbackq: size=%d: \"%.*s\"\n",
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(dest - stackblock()) - startloc,
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(dest - stackblock()) - startloc,
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stackblock() + startloc));
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expdest = dest;
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INTON;
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}
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|
|
|
|
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/*
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* Expand a variable, and return a pointer to the next character in the
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* input string.
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*/
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STATIC char *
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evalvar(p, full)
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char *p;
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{
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int subtype;
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int flags;
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char *var;
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char *val;
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int c;
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int set;
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int special;
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int startloc;
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flags = *p++;
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subtype = flags & VSTYPE;
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var = p;
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special = 0;
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if (! is_name(*p))
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special = 1;
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p = strchr(p, '=') + 1;
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again: /* jump here after setting a variable with ${var=text} */
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if (special) {
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set = varisset(*var);
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val = NULL;
|
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} else {
|
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val = lookupvar(var);
|
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if (val == NULL || (flags & VSNUL) && val[0] == '\0') {
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val = NULL;
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set = 0;
|
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} else
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set = 1;
|
|
}
|
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startloc = expdest - stackblock();
|
|
if (set && subtype != VSPLUS) {
|
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/* insert the value of the variable */
|
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if (special) {
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varvalue(*var, flags & VSQUOTE, full);
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} else {
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char const *syntax = (flags & VSQUOTE)? DQSYNTAX : BASESYNTAX;
|
|
|
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while (*val) {
|
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if (full && syntax[*val] == CCTL)
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STPUTC(CTLESC, expdest);
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STPUTC(*val++, expdest);
|
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}
|
|
}
|
|
}
|
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if (subtype == VSPLUS)
|
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set = ! set;
|
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if (((flags & VSQUOTE) == 0 || (*var == '@' && shellparam.nparam != 1))
|
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&& (set || subtype == VSNORMAL))
|
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recordregion(startloc, expdest - stackblock(), flags & VSQUOTE);
|
|
if (! set && subtype != VSNORMAL) {
|
|
if (subtype == VSPLUS || subtype == VSMINUS) {
|
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argstr(p, full);
|
|
} else {
|
|
char *startp;
|
|
int saveherefd = herefd;
|
|
herefd = -1;
|
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argstr(p, 0);
|
|
STACKSTRNUL(expdest);
|
|
herefd = saveherefd;
|
|
startp = stackblock() + startloc;
|
|
if (subtype == VSASSIGN) {
|
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setvar(var, startp, 0);
|
|
STADJUST(startp - expdest, expdest);
|
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flags &=~ VSNUL;
|
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goto again;
|
|
}
|
|
/* subtype == VSQUESTION */
|
|
if (*p != CTLENDVAR) {
|
|
outfmt(&errout, "%s\n", startp);
|
|
error((char *)NULL);
|
|
}
|
|
error("%.*s: parameter %snot set", p - var - 1,
|
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var, (flags & VSNUL)? "null or " : nullstr);
|
|
}
|
|
}
|
|
if (subtype != VSNORMAL) { /* skip to end of alternative */
|
|
int nesting = 1;
|
|
for (;;) {
|
|
if ((c = *p++) == CTLESC)
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p++;
|
|
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
|
|
if (set) {
|
|
if (argbackq != NULL)
|
|
argbackq = argbackq->next;
|
|
}
|
|
} else if (c == CTLVAR) {
|
|
if ((*p++ & VSTYPE) != VSNORMAL)
|
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nesting++;
|
|
} else if (c == CTLENDVAR) {
|
|
if (--nesting == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Test whether a specialized variable is set.
|
|
*/
|
|
|
|
STATIC int
|
|
varisset(name)
|
|
char name;
|
|
{
|
|
char **ap;
|
|
|
|
if (name == '!') {
|
|
if (backgndpid == -1)
|
|
return 0;
|
|
} else if (name == '@' || name == '*') {
|
|
if (*shellparam.p == NULL)
|
|
return 0;
|
|
} else if ((unsigned)(name -= '1') <= '9' - '1') {
|
|
ap = shellparam.p;
|
|
do {
|
|
if (*ap++ == NULL)
|
|
return 0;
|
|
} while (--name >= 0);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Add the value of a specialized variable to the stack string.
|
|
*/
|
|
|
|
STATIC void
|
|
varvalue(name, quoted, allow_split)
|
|
char name;
|
|
{
|
|
int num;
|
|
char temp[32];
|
|
char *p;
|
|
int i;
|
|
extern int exitstatus;
|
|
char sep;
|
|
char **ap;
|
|
char const *syntax;
|
|
|
|
switch (name) {
|
|
case '$':
|
|
num = rootpid;
|
|
goto numvar;
|
|
case '?':
|
|
num = exitstatus;
|
|
goto numvar;
|
|
case '#':
|
|
num = shellparam.nparam;
|
|
goto numvar;
|
|
case '!':
|
|
num = backgndpid;
|
|
numvar:
|
|
p = temp + 31;
|
|
temp[31] = '\0';
|
|
do {
|
|
*--p = num % 10 + '0';
|
|
} while ((num /= 10) != 0);
|
|
while (*p)
|
|
STPUTC(*p++, expdest);
|
|
break;
|
|
case '-':
|
|
for (i = 0 ; optchar[i] ; i++) {
|
|
if (optval[i])
|
|
STPUTC(optchar[i], expdest);
|
|
}
|
|
break;
|
|
case '@':
|
|
if (allow_split) {
|
|
sep = '\0';
|
|
goto allargs;
|
|
}
|
|
/* fall through */
|
|
case '*':
|
|
sep = ' ';
|
|
allargs:
|
|
/* Only emit CTLESC if we will do further processing,
|
|
i.e. if allow_split is set. */
|
|
syntax = quoted && allow_split ? DQSYNTAX : BASESYNTAX;
|
|
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
|
|
/* should insert CTLESC characters */
|
|
while (*p) {
|
|
if (syntax[*p] == CCTL)
|
|
STPUTC(CTLESC, expdest);
|
|
STPUTC(*p++, expdest);
|
|
}
|
|
if (*ap)
|
|
STPUTC(sep, expdest);
|
|
}
|
|
break;
|
|
case '0':
|
|
p = arg0;
|
|
string:
|
|
/* Only emit CTLESC if we will do further processing,
|
|
i.e. if allow_split is set. */
|
|
syntax = quoted && allow_split ? DQSYNTAX : BASESYNTAX;
|
|
while (*p) {
|
|
if (syntax[*p] == CCTL)
|
|
STPUTC(CTLESC, expdest);
|
|
STPUTC(*p++, expdest);
|
|
}
|
|
break;
|
|
default:
|
|
if ((unsigned)(name -= '1') <= '9' - '1') {
|
|
p = shellparam.p[name];
|
|
goto string;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Record the the fact that we have to scan this region of the
|
|
* string for IFS characters.
|
|
*/
|
|
|
|
STATIC void
|
|
recordregion(start, end, nulonly) {
|
|
register struct ifsregion *ifsp;
|
|
|
|
if (ifslastp == NULL) {
|
|
ifsp = &ifsfirst;
|
|
} else {
|
|
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
|
|
ifslastp->next = ifsp;
|
|
}
|
|
ifslastp = ifsp;
|
|
ifslastp->next = NULL;
|
|
ifslastp->begoff = start;
|
|
ifslastp->endoff = end;
|
|
ifslastp->nulonly = nulonly;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Break the argument string into pieces based upon IFS and add the
|
|
* strings to the argument list. The regions of the string to be
|
|
* searched for IFS characters have been stored by recordregion.
|
|
*/
|
|
|
|
STATIC void
|
|
ifsbreakup(string, arglist)
|
|
char *string;
|
|
struct arglist *arglist;
|
|
{
|
|
struct ifsregion *ifsp;
|
|
struct strlist *sp;
|
|
char *start;
|
|
register char *p;
|
|
char *q;
|
|
char *ifs;
|
|
|
|
start = string;
|
|
if (ifslastp != NULL) {
|
|
ifsp = &ifsfirst;
|
|
do {
|
|
p = string + ifsp->begoff;
|
|
ifs = ifsp->nulonly? nullstr : ifsval();
|
|
while (p < string + ifsp->endoff) {
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p++)) {
|
|
if (q > start || *ifs != ' ') {
|
|
*q = '\0';
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
if (*ifs == ' ') {
|
|
for (;;) {
|
|
if (p >= string + ifsp->endoff)
|
|
break;
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p++) == NULL) {
|
|
p = q;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
start = p;
|
|
}
|
|
}
|
|
} while ((ifsp = ifsp->next) != NULL);
|
|
if (*start || (*ifs != ' ' && start > string)) {
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
} else {
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Expand shell metacharacters. At this point, the only control characters
|
|
* should be escapes. The results are stored in the list exparg.
|
|
*/
|
|
|
|
char *expdir;
|
|
|
|
|
|
STATIC void
|
|
expandmeta(str)
|
|
struct strlist *str;
|
|
{
|
|
char *p;
|
|
struct strlist **savelastp;
|
|
struct strlist *sp;
|
|
char c;
|
|
|
|
while (str) {
|
|
if (fflag)
|
|
goto nometa;
|
|
p = str->text;
|
|
#if UDIR
|
|
if (p[0] == '/' && p[1] == 'u' && p[2] == '/')
|
|
str->text = p = expudir(p);
|
|
#endif
|
|
#if TILDE
|
|
if (p[0] == '~')
|
|
str->text = p = expudir(p);
|
|
#endif
|
|
for (;;) { /* fast check for meta chars */
|
|
if ((c = *p++) == '\0')
|
|
goto nometa;
|
|
if (c == '*' || c == '?' || c == '[' || c == '!')
|
|
break;
|
|
}
|
|
savelastp = exparg.lastp;
|
|
INTOFF;
|
|
if (expdir == NULL)
|
|
{
|
|
int i = strlen(str->text);
|
|
expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
|
|
}
|
|
expmeta(expdir, str->text);
|
|
ckfree(expdir);
|
|
expdir = NULL;
|
|
INTON;
|
|
if (exparg.lastp == savelastp) {
|
|
if (! zflag) {
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text);
|
|
exparg.lastp = &str->next;
|
|
}
|
|
} else {
|
|
*exparg.lastp = NULL;
|
|
*savelastp = sp = expsort(*savelastp);
|
|
while (sp->next != NULL)
|
|
sp = sp->next;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
|
|
|
|
#if UDIR || TILDE
|
|
/*
|
|
* UDIR: Expand /u/username into the home directory for the specified user.
|
|
* TILDE: Expand ~username into the home directory for the specified user.
|
|
* We hope not to use the getpw stuff here, because then we would have to load
|
|
* in stdio and who knows what else. With networked password files there is
|
|
* no choice alas.
|
|
*/
|
|
|
|
#define MAXLOGNAME 32
|
|
#define MAXPWLINE 128
|
|
|
|
char *pfgets();
|
|
|
|
|
|
STATIC char *
|
|
expudir(path)
|
|
char *path;
|
|
{
|
|
register char *p, *q, *r;
|
|
char name[MAXLOGNAME];
|
|
char line[MAXPWLINE];
|
|
int i;
|
|
#if USEGETPW
|
|
struct passwd *pw;
|
|
#endif
|
|
|
|
r = path; /* result on failure */
|
|
p = r + (*r == '~' ? 1 : 3); /* the 1 skips "~", 3 skips "/u/" */
|
|
q = name;
|
|
while (*p && *p != '/') {
|
|
if (q >= name + MAXLOGNAME - 1)
|
|
return r; /* fail, name too long */
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
|
|
#if TILDE
|
|
if (*name == 0 && *r == '~') {
|
|
/* null name, use $HOME */
|
|
if ((q = lookupvar("HOME")) == NULL)
|
|
return r; /* fail, home not set */
|
|
i = strlen(q);
|
|
r = stalloc(i + strlen(p) + 1);
|
|
scopy(q, r);
|
|
scopy(p, r + i);
|
|
TRACE(("expudir converts %s to %s\n", path, r));
|
|
didudir = 1;
|
|
path = r;
|
|
return r;
|
|
}
|
|
#endif
|
|
#if !USEGETPW /* can do without the bloat */
|
|
setinputfile("/etc/passwd", 1);
|
|
q = line + strlen(name);
|
|
while (pfgets(line, MAXPWLINE) != NULL) {
|
|
if (line[0] == name[0] && prefix(name, line) && *q == ':') {
|
|
/* skip to start of home directory */
|
|
i = 4;
|
|
do {
|
|
while (*++q && *q != ':');
|
|
} while (--i > 0);
|
|
if (*q == '\0')
|
|
break; /* fail, corrupted /etc/passwd */
|
|
q++;
|
|
for (r = q ; *r && *r != '\n' && *r != ':' ; r++);
|
|
*r = '\0'; /* nul terminate home directory */
|
|
i = r - q; /* i = strlen(q) */
|
|
r = stalloc(i + strlen(p) + 1);
|
|
scopy(q, r);
|
|
scopy(p, r + i);
|
|
TRACE(("expudir converts %s to %s\n", path, r));
|
|
didudir = 1;
|
|
path = r; /* succeed */
|
|
break;
|
|
}
|
|
}
|
|
popfile();
|
|
#else
|
|
if ((pw = getpwnam(name)) != NULL) {
|
|
/* user exists */
|
|
q = pw->pw_dir;
|
|
i = strlen(q);
|
|
r = stalloc(i + strlen(p) + 1);
|
|
scopy(q, r);
|
|
scopy(p, r + i);
|
|
TRACE(("expudir converts %s to %s\n", path, r));
|
|
didudir = 1;
|
|
path = r;
|
|
}
|
|
endpwent();
|
|
#endif /* USEGETPW */
|
|
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Do metacharacter (i.e. *, ?, [...]) expansion.
|
|
*/
|
|
|
|
STATIC void
|
|
expmeta(enddir, name)
|
|
char *enddir;
|
|
char *name;
|
|
{
|
|
register char *p;
|
|
char *q;
|
|
char *start;
|
|
char *endname;
|
|
int metaflag;
|
|
struct stat statb;
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
int atend;
|
|
int matchdot;
|
|
|
|
metaflag = 0;
|
|
start = name;
|
|
for (p = name ; ; p++) {
|
|
if (*p == '*' || *p == '?')
|
|
metaflag = 1;
|
|
else if (*p == '[') {
|
|
q = p + 1;
|
|
if (*q == '!')
|
|
q++;
|
|
for (;;) {
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (*q == '/' || *q == '\0')
|
|
break;
|
|
if (*++q == ']') {
|
|
metaflag = 1;
|
|
break;
|
|
}
|
|
}
|
|
} else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
|
|
metaflag = 1;
|
|
} else if (*p == '\0')
|
|
break;
|
|
else if (*p == CTLESC)
|
|
p++;
|
|
if (*p == '/') {
|
|
if (metaflag)
|
|
break;
|
|
start = p + 1;
|
|
}
|
|
}
|
|
if (metaflag == 0) { /* we've reached the end of the file name */
|
|
if (enddir != expdir)
|
|
metaflag++;
|
|
for (p = name ; ; p++) {
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p;
|
|
if (*p == '\0')
|
|
break;
|
|
}
|
|
if (metaflag == 0 || stat(expdir, &statb) >= 0)
|
|
addfname(expdir);
|
|
return;
|
|
}
|
|
endname = p;
|
|
if (start != name) {
|
|
p = name;
|
|
while (p < start) {
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p++;
|
|
}
|
|
}
|
|
if (enddir == expdir) {
|
|
p = ".";
|
|
} else if (enddir == expdir + 1 && *expdir == '/') {
|
|
p = "/";
|
|
} else {
|
|
p = expdir;
|
|
enddir[-1] = '\0';
|
|
}
|
|
if ((dirp = opendir(p)) == NULL)
|
|
return;
|
|
if (enddir != expdir)
|
|
enddir[-1] = '/';
|
|
if (*endname == 0) {
|
|
atend = 1;
|
|
} else {
|
|
atend = 0;
|
|
*endname++ = '\0';
|
|
}
|
|
matchdot = 0;
|
|
if (start[0] == '.' || start[0] == CTLESC && start[1] == '.')
|
|
matchdot++;
|
|
while (! int_pending() && (dp = readdir(dirp)) != NULL) {
|
|
if (dp->d_name[0] == '.' && ! matchdot)
|
|
continue;
|
|
if (patmatch(start, dp->d_name)) {
|
|
if (atend) {
|
|
scopy(dp->d_name, enddir);
|
|
addfname(expdir);
|
|
} else {
|
|
char *q;
|
|
for (p = enddir, q = dp->d_name ; *p++ = *q++ ;);
|
|
p[-1] = '/';
|
|
expmeta(p, endname);
|
|
}
|
|
}
|
|
}
|
|
closedir(dirp);
|
|
if (! atend)
|
|
endname[-1] = '/';
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a file name to the list.
|
|
*/
|
|
|
|
STATIC void
|
|
addfname(name)
|
|
char *name;
|
|
{
|
|
char *p;
|
|
struct strlist *sp;
|
|
|
|
p = stalloc(strlen(name) + 1);
|
|
scopy(name, p);
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = p;
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
|
|
|
|
/*
|
|
* Sort the results of file name expansion. It calculates the number of
|
|
* strings to sort and then calls msort (short for merge sort) to do the
|
|
* work.
|
|
*/
|
|
|
|
STATIC struct strlist *
|
|
expsort(str)
|
|
struct strlist *str;
|
|
{
|
|
int len;
|
|
struct strlist *sp;
|
|
|
|
len = 0;
|
|
for (sp = str ; sp ; sp = sp->next)
|
|
len++;
|
|
return msort(str, len);
|
|
}
|
|
|
|
|
|
STATIC struct strlist *
|
|
msort(list, len)
|
|
struct strlist *list;
|
|
{
|
|
struct strlist *p, *q;
|
|
struct strlist **lpp;
|
|
int half;
|
|
int n;
|
|
|
|
if (len <= 1)
|
|
return list;
|
|
half = len >> 1;
|
|
p = list;
|
|
for (n = half ; --n >= 0 ; ) {
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
q->next = NULL; /* terminate first half of list */
|
|
q = msort(list, half); /* sort first half of list */
|
|
p = msort(p, len - half); /* sort second half */
|
|
lpp = &list;
|
|
for (;;) {
|
|
if (strcmp(p->text, q->text) < 0) {
|
|
*lpp = p;
|
|
lpp = &p->next;
|
|
if ((p = *lpp) == NULL) {
|
|
*lpp = q;
|
|
break;
|
|
}
|
|
} else {
|
|
*lpp = q;
|
|
lpp = &q->next;
|
|
if ((q = *lpp) == NULL) {
|
|
*lpp = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return list;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Returns true if the pattern matches the string.
|
|
*/
|
|
|
|
int
|
|
patmatch(pattern, string)
|
|
char *pattern;
|
|
char *string;
|
|
{
|
|
if (pattern[0] == '!' && pattern[1] == '!')
|
|
return 1 - pmatch(pattern + 2, string);
|
|
else
|
|
return pmatch(pattern, string);
|
|
}
|
|
|
|
|
|
STATIC int
|
|
pmatch(pattern, string)
|
|
char *pattern;
|
|
char *string;
|
|
{
|
|
register char *p, *q;
|
|
register char c;
|
|
|
|
p = pattern;
|
|
q = string;
|
|
for (;;) {
|
|
switch (c = *p++) {
|
|
case '\0':
|
|
goto breakloop;
|
|
case CTLESC:
|
|
if (*q++ != *p++)
|
|
return 0;
|
|
break;
|
|
case '?':
|
|
if (*q++ == '\0')
|
|
return 0;
|
|
break;
|
|
case '*':
|
|
c = *p;
|
|
if (c != CTLESC && c != '?' && c != '*' && c != '[') {
|
|
while (*q != c) {
|
|
if (*q == '\0')
|
|
return 0;
|
|
q++;
|
|
}
|
|
}
|
|
do {
|
|
if (pmatch(p, q))
|
|
return 1;
|
|
} while (*q++ != '\0');
|
|
return 0;
|
|
case '[': {
|
|
char *endp;
|
|
int invert, found;
|
|
char chr;
|
|
|
|
endp = p;
|
|
if (*endp == '!')
|
|
endp++;
|
|
for (;;) {
|
|
if (*endp == '\0')
|
|
goto dft; /* no matching ] */
|
|
if (*endp == CTLESC)
|
|
endp++;
|
|
if (*++endp == ']')
|
|
break;
|
|
}
|
|
invert = 0;
|
|
if (*p == '!') {
|
|
invert++;
|
|
p++;
|
|
}
|
|
found = 0;
|
|
chr = *q++;
|
|
c = *p++;
|
|
do {
|
|
if (c == CTLESC)
|
|
c = *p++;
|
|
if (*p == '-' && p[1] != ']') {
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (chr >= c && chr <= *p)
|
|
found = 1;
|
|
p++;
|
|
} else {
|
|
if (chr == c)
|
|
found = 1;
|
|
}
|
|
} while ((c = *p++) != ']');
|
|
if (found == invert)
|
|
return 0;
|
|
break;
|
|
}
|
|
dft: default:
|
|
if (*q++ != c)
|
|
return 0;
|
|
break;
|
|
}
|
|
}
|
|
breakloop:
|
|
if (*q != '\0')
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Remove any CTLESC characters from a string.
|
|
*/
|
|
|
|
void
|
|
rmescapes(str)
|
|
char *str;
|
|
{
|
|
register char *p, *q;
|
|
|
|
p = str;
|
|
while (*p != CTLESC) {
|
|
if (*p++ == '\0')
|
|
return;
|
|
}
|
|
q = p;
|
|
while (*p) {
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* See if a pattern matches in a case statement.
|
|
*/
|
|
|
|
int
|
|
casematch(pattern, val)
|
|
union node *pattern;
|
|
char *val;
|
|
{
|
|
struct stackmark smark;
|
|
int result;
|
|
char *p;
|
|
|
|
setstackmark(&smark);
|
|
argbackq = pattern->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
ifslastp = NULL;
|
|
/* Preserve any CTLESC characters inserted previously, so that
|
|
we won't expand reg exps which are inside strings. */
|
|
argstr(pattern->narg.text, 1);
|
|
STPUTC('\0', expdest);
|
|
p = grabstackstr(expdest);
|
|
result = patmatch(p, val);
|
|
popstackmark(&smark);
|
|
return result;
|
|
}
|