1850 lines
42 KiB
C
1850 lines
42 KiB
C
/* $OpenBSD: eval.c,v 1.40 2013/09/14 20:09:30 millert Exp $ */
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/*-
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* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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* 2011, 2012, 2013, 2014, 2015
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* Thorsten Glaser <tg@mirbsd.org>
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*
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* Provided that these terms and disclaimer and all copyright notices
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* are retained or reproduced in an accompanying document, permission
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* is granted to deal in this work without restriction, including un-
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* limited rights to use, publicly perform, distribute, sell, modify,
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* merge, give away, or sublicence.
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*
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* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
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* the utmost extent permitted by applicable law, neither express nor
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* implied; without malicious intent or gross negligence. In no event
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* may a licensor, author or contributor be held liable for indirect,
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* direct, other damage, loss, or other issues arising in any way out
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* of dealing in the work, even if advised of the possibility of such
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* damage or existence of a defect, except proven that it results out
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* of said person's immediate fault when using the work as intended.
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*/
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.163 2015/02/06 10:09:05 tg Exp $");
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/*
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* string expansion
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*
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* first pass: quoting, IFS separation, ~, ${}, $() and $(()) substitution.
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* second pass: alternation ({,}), filename expansion (*?[]).
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*/
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/* expansion generator state */
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typedef struct {
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/* not including an "int type;" member, see expand() */
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/* string */
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const char *str;
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/* source */
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union {
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/* string[] */
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const char **strv;
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/* file */
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struct shf *shf;
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} u;
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/* variable in ${var...} */
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struct tbl *var;
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/* split "$@" / call waitlast in $() */
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bool split;
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} Expand;
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#define XBASE 0 /* scanning original */
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#define XSUB 1 /* expanding ${} string */
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#define XARGSEP 2 /* ifs0 between "$*" */
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#define XARG 3 /* expanding $*, $@ */
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#define XCOM 4 /* expanding $() */
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#define XNULLSUB 5 /* "$@" when $# is 0 (don't generate word) */
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#define XSUBMID 6 /* middle of expanding ${} */
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/* States used for field splitting */
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#define IFS_WORD 0 /* word has chars (or quotes) */
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#define IFS_WS 1 /* have seen IFS white-space */
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#define IFS_NWS 2 /* have seen IFS non-white-space */
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#define IFS_IWS 3 /* begin of word, ignore IFS WS */
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static int varsub(Expand *, const char *, const char *, int *, int *);
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static int comsub(Expand *, const char *, int);
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static char *valsub(struct op *, Area *);
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static char *trimsub(char *, char *, int);
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static void glob(char *, XPtrV *, bool);
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static void globit(XString *, char **, char *, XPtrV *, int);
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static const char *maybe_expand_tilde(const char *, XString *, char **, bool);
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#ifndef MKSH_NOPWNAM
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static char *homedir(char *);
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#endif
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static void alt_expand(XPtrV *, char *, char *, char *, int);
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static int utflen(const char *) MKSH_A_PURE;
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static void utfincptr(const char *, mksh_ari_t *);
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/* UTFMODE functions */
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static int
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utflen(const char *s)
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{
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size_t n;
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if (UTFMODE) {
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n = 0;
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while (*s) {
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s += utf_ptradj(s);
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++n;
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}
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} else
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n = strlen(s);
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if (n > 2147483647)
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n = 2147483647;
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return ((int)n);
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}
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static void
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utfincptr(const char *s, mksh_ari_t *lp)
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{
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const char *cp = s;
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while ((*lp)--)
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cp += utf_ptradj(cp);
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*lp = cp - s;
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}
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/* compile and expand word */
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char *
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substitute(const char *cp, int f)
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{
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struct source *s, *sold;
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sold = source;
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s = pushs(SWSTR, ATEMP);
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s->start = s->str = cp;
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source = s;
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if (yylex(ONEWORD) != LWORD)
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internal_errorf("bad substitution");
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source = sold;
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afree(s, ATEMP);
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return (evalstr(yylval.cp, f));
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}
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/*
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* expand arg-list
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*/
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char **
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eval(const char **ap, int f)
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{
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XPtrV w;
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if (*ap == NULL) {
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union mksh_ccphack vap;
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vap.ro = ap;
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return (vap.rw);
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}
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XPinit(w, 32);
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/* space for shell name */
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XPput(w, NULL);
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while (*ap != NULL)
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expand(*ap++, &w, f);
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XPput(w, NULL);
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return ((char **)XPclose(w) + 1);
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}
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/*
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* expand string
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*/
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char *
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evalstr(const char *cp, int f)
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{
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XPtrV w;
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char *dp = null;
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XPinit(w, 1);
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expand(cp, &w, f);
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if (XPsize(w))
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dp = *XPptrv(w);
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XPfree(w);
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return (dp);
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}
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/*
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* expand string - return only one component
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* used from iosetup to expand redirection files
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*/
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char *
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evalonestr(const char *cp, int f)
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{
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XPtrV w;
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char *rv;
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XPinit(w, 1);
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expand(cp, &w, f);
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switch (XPsize(w)) {
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case 0:
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rv = null;
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break;
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case 1:
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rv = (char *) *XPptrv(w);
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break;
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default:
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rv = evalstr(cp, f&~DOGLOB);
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break;
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}
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XPfree(w);
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return (rv);
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}
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/* for nested substitution: ${var:=$var2} */
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typedef struct SubType {
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struct tbl *var; /* variable for ${var..} */
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struct SubType *prev; /* old type */
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struct SubType *next; /* poped type (to avoid re-allocating) */
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size_t base; /* begin position of expanded word */
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short stype; /* [=+-?%#] action after expanded word */
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short f; /* saved value of f (DOPAT, etc) */
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uint8_t quotep; /* saved value of quote (for ${..[%#]..}) */
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uint8_t quotew; /* saved value of quote (for ${..[+-=]..}) */
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} SubType;
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void
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expand(
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/* input word */
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const char *ccp,
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/* output words */
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XPtrV *wp,
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/* DO* flags */
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int f)
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{
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int c = 0;
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/* expansion type */
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int type;
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/* quoted */
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int quote = 0;
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/* destination string and live pointer */
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XString ds;
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char *dp;
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/* source */
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const char *sp;
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/* second pass flags */
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int fdo;
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/* have word */
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int word;
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/* field splitting of parameter/command substitution */
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int doblank;
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/* expansion variables */
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Expand x = {
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NULL, { NULL }, NULL, 0
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};
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SubType st_head, *st;
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/* record number of trailing newlines in COMSUB */
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int newlines = 0;
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bool saw_eq, make_magic;
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unsigned int tilde_ok;
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size_t len;
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char *cp;
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if (ccp == NULL)
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internal_errorf("expand(NULL)");
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/* for alias, readonly, set, typeset commands */
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if ((f & DOVACHECK) && is_wdvarassign(ccp)) {
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f &= ~(DOVACHECK | DOBLANK | DOGLOB | DOTILDE);
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f |= DOASNTILDE | DOSCALAR;
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}
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if (Flag(FNOGLOB))
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f &= ~DOGLOB;
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if (Flag(FMARKDIRS))
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f |= DOMARKDIRS;
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if (Flag(FBRACEEXPAND) && (f & DOGLOB))
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f |= DOBRACE;
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/* init destination string */
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Xinit(ds, dp, 128, ATEMP);
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type = XBASE;
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sp = ccp;
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fdo = 0;
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saw_eq = false;
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/* must be 1/0 */
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tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0;
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doblank = 0;
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make_magic = false;
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word = (f&DOBLANK) ? IFS_WS : IFS_WORD;
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/* clang doesn't know OSUBST comes before CSUBST */
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memset(&st_head, 0, sizeof(st_head));
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st = &st_head;
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while (/* CONSTCOND */ 1) {
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Xcheck(ds, dp);
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switch (type) {
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case XBASE:
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/* original prefixed string */
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c = *sp++;
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switch (c) {
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case EOS:
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c = 0;
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break;
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case CHAR:
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c = *sp++;
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break;
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case QCHAR:
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/* temporary quote */
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quote |= 2;
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c = *sp++;
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break;
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case OQUOTE:
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word = IFS_WORD;
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tilde_ok = 0;
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quote = 1;
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continue;
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case CQUOTE:
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quote = st->quotew;
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continue;
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case COMSUB:
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case FUNSUB:
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case VALSUB:
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tilde_ok = 0;
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if (f & DONTRUNCOMMAND) {
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word = IFS_WORD;
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*dp++ = '$';
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*dp++ = c == COMSUB ? '(' : '{';
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if (c != COMSUB)
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*dp++ = c == FUNSUB ? ' ' : '|';
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while (*sp != '\0') {
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Xcheck(ds, dp);
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*dp++ = *sp++;
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}
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if (c != COMSUB) {
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*dp++ = ';';
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*dp++ = '}';
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} else
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*dp++ = ')';
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} else {
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type = comsub(&x, sp, c);
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if (type != XBASE && (f & DOBLANK))
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doblank++;
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sp = strnul(sp) + 1;
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newlines = 0;
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}
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continue;
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case EXPRSUB:
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tilde_ok = 0;
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if (f & DONTRUNCOMMAND) {
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word = IFS_WORD;
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*dp++ = '$'; *dp++ = '('; *dp++ = '(';
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while (*sp != '\0') {
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Xcheck(ds, dp);
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*dp++ = *sp++;
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}
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*dp++ = ')'; *dp++ = ')';
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} else {
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struct tbl v;
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v.flag = DEFINED|ISSET|INTEGER;
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/* not default */
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v.type = 10;
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v.name[0] = '\0';
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v_evaluate(&v, substitute(sp, 0),
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KSH_UNWIND_ERROR, true);
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sp = strnul(sp) + 1;
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x.str = str_val(&v);
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type = XSUB;
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if (f & DOBLANK)
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doblank++;
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}
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continue;
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case OSUBST: {
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/* ${{#}var{:}[=+-?#%]word} */
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/*-
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* format is:
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* OSUBST [{x] plain-variable-part \0
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* compiled-word-part CSUBST [}x]
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* This is where all syntax checking gets done...
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*/
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/* skip the { or x (}) */
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const char *varname = ++sp;
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int stype;
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int slen = 0;
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|
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/* skip variable */
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sp = cstrchr(sp, '\0') + 1;
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type = varsub(&x, varname, sp, &stype, &slen);
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if (type < 0) {
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char *beg, *end, *str;
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unwind_substsyn:
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/* restore sp */
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sp = varname - 2;
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end = (beg = wdcopy(sp, ATEMP)) +
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(wdscan(sp, CSUBST) - sp);
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/* ({) the } or x is already skipped */
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if (end < wdscan(beg, EOS))
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*end = EOS;
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str = snptreef(NULL, 64, "%S", beg);
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afree(beg, ATEMP);
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errorf("%s: %s", str, "bad substitution");
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}
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if (f & DOBLANK)
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doblank++;
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tilde_ok = 0;
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if (type == XBASE) {
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/* expand? */
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if (!st->next) {
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SubType *newst;
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newst = alloc(sizeof(SubType), ATEMP);
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newst->next = NULL;
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newst->prev = st;
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st->next = newst;
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}
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st = st->next;
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st->stype = stype;
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st->base = Xsavepos(ds, dp);
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st->f = f;
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if (x.var == &vtemp) {
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st->var = tempvar();
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st->var->flag &= ~INTEGER;
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/* can't fail here */
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setstr(st->var,
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str_val(x.var),
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KSH_RETURN_ERROR | 0x4);
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} else
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st->var = x.var;
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st->quotew = st->quotep = quote;
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/* skip qualifier(s) */
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if (stype)
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sp += slen;
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switch (stype & 0x17F) {
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case 0x100 | '#':
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x.str = shf_smprintf("%08X",
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(unsigned int)hash(str_val(st->var)));
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break;
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case 0x100 | 'Q': {
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struct shf shf;
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shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf);
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print_value_quoted(&shf, str_val(st->var));
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x.str = shf_sclose(&shf);
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break;
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}
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case '0': {
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char *beg, *mid, *end, *stg;
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mksh_ari_t from = 0, num = -1, flen, finc = 0;
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beg = wdcopy(sp, ATEMP);
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mid = beg + (wdscan(sp, ADELIM) - sp);
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stg = beg + (wdscan(sp, CSUBST) - sp);
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if (mid >= stg)
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goto unwind_substsyn;
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mid[-2] = EOS;
|
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if (mid[-1] == /*{*/'}') {
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sp += mid - beg - 1;
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end = NULL;
|
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} else {
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|
end = mid +
|
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(wdscan(mid, ADELIM) - mid);
|
|
if (end >= stg ||
|
|
/* more than max delimiters */
|
|
end[-1] != /*{*/ '}')
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goto unwind_substsyn;
|
|
end[-2] = EOS;
|
|
sp += end - beg - 1;
|
|
}
|
|
evaluate(substitute(stg = wdstrip(beg, 0), 0),
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&from, KSH_UNWIND_ERROR, true);
|
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afree(stg, ATEMP);
|
|
if (end) {
|
|
evaluate(substitute(stg = wdstrip(mid, 0), 0),
|
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&num, KSH_UNWIND_ERROR, true);
|
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afree(stg, ATEMP);
|
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}
|
|
afree(beg, ATEMP);
|
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beg = str_val(st->var);
|
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flen = utflen(beg);
|
|
if (from < 0) {
|
|
if (-from < flen)
|
|
finc = flen + from;
|
|
} else
|
|
finc = from < flen ? from : flen;
|
|
if (UTFMODE)
|
|
utfincptr(beg, &finc);
|
|
beg += finc;
|
|
flen = utflen(beg);
|
|
if (num < 0 || num > flen)
|
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num = flen;
|
|
if (UTFMODE)
|
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utfincptr(beg, &num);
|
|
strndupx(x.str, beg, num, ATEMP);
|
|
goto do_CSUBST;
|
|
}
|
|
case '/': {
|
|
char *s, *p, *d, *sbeg, *end;
|
|
char *pat, *rrep;
|
|
char *tpat0, *tpat1, *tpat2;
|
|
|
|
s = wdcopy(sp, ATEMP);
|
|
p = s + (wdscan(sp, ADELIM) - sp);
|
|
d = s + (wdscan(sp, CSUBST) - sp);
|
|
if (p >= d)
|
|
goto unwind_substsyn;
|
|
p[-2] = EOS;
|
|
if (p[-1] == /*{*/'}')
|
|
d = NULL;
|
|
else
|
|
d[-2] = EOS;
|
|
sp += (d ? d : p) - s - 1;
|
|
tpat0 = wdstrip(s,
|
|
WDS_KEEPQ | WDS_MAGIC);
|
|
pat = substitute(tpat0, 0);
|
|
if (d) {
|
|
d = wdstrip(p, WDS_KEEPQ);
|
|
rrep = substitute(d, 0);
|
|
afree(d, ATEMP);
|
|
} else
|
|
rrep = null;
|
|
afree(s, ATEMP);
|
|
s = d = pat;
|
|
while (*s)
|
|
if (*s != '\\' ||
|
|
s[1] == '%' ||
|
|
s[1] == '#' ||
|
|
s[1] == '\0' ||
|
|
/* XXX really? */ s[1] == '\\' ||
|
|
s[1] == '/')
|
|
*d++ = *s++;
|
|
else
|
|
s++;
|
|
*d = '\0';
|
|
afree(tpat0, ATEMP);
|
|
|
|
/* check for special cases */
|
|
d = str_val(st->var);
|
|
switch (*pat) {
|
|
case '#':
|
|
/* anchor at begin */
|
|
tpat0 = pat + 1;
|
|
tpat1 = rrep;
|
|
tpat2 = d;
|
|
break;
|
|
case '%':
|
|
/* anchor at end */
|
|
tpat0 = pat + 1;
|
|
tpat1 = d;
|
|
tpat2 = rrep;
|
|
break;
|
|
case '\0':
|
|
/* empty pattern */
|
|
goto no_repl;
|
|
default:
|
|
tpat0 = pat;
|
|
/* silence gcc */
|
|
tpat1 = tpat2 = NULL;
|
|
}
|
|
if (gmatchx(null, tpat0, false)) {
|
|
/*
|
|
* pattern matches
|
|
* the empty string
|
|
*/
|
|
if (tpat0 == pat)
|
|
goto no_repl;
|
|
/* but is anchored */
|
|
s = shf_smprintf("%s%s",
|
|
tpat1, tpat2);
|
|
goto do_repl;
|
|
}
|
|
|
|
/* prepare string on which to work */
|
|
strdupx(s, d, ATEMP);
|
|
sbeg = s;
|
|
|
|
/* first see if we have any match at all */
|
|
tpat0 = pat;
|
|
if (*pat == '#') {
|
|
/* anchor at the beginning */
|
|
tpat1 = shf_smprintf("%s%c*", ++tpat0, MAGIC);
|
|
tpat2 = tpat1;
|
|
} else if (*pat == '%') {
|
|
/* anchor at the end */
|
|
tpat1 = shf_smprintf("%c*%s", MAGIC, ++tpat0);
|
|
tpat2 = tpat0;
|
|
} else {
|
|
/* float */
|
|
tpat1 = shf_smprintf("%c*%s%c*", MAGIC, pat, MAGIC);
|
|
tpat2 = tpat1 + 2;
|
|
}
|
|
again_repl:
|
|
/*
|
|
* this would not be necessary if gmatchx would return
|
|
* the start and end values of a match found, like re*
|
|
*/
|
|
if (!gmatchx(sbeg, tpat1, false))
|
|
goto end_repl;
|
|
end = strnul(s);
|
|
/* now anchor the beginning of the match */
|
|
if (*pat != '#')
|
|
while (sbeg <= end) {
|
|
if (gmatchx(sbeg, tpat2, false))
|
|
break;
|
|
else
|
|
sbeg++;
|
|
}
|
|
/* now anchor the end of the match */
|
|
p = end;
|
|
if (*pat != '%')
|
|
while (p >= sbeg) {
|
|
bool gotmatch;
|
|
|
|
c = *p;
|
|
*p = '\0';
|
|
gotmatch = tobool(gmatchx(sbeg, tpat0, false));
|
|
*p = c;
|
|
if (gotmatch)
|
|
break;
|
|
p--;
|
|
}
|
|
strndupx(end, s, sbeg - s, ATEMP);
|
|
d = shf_smprintf("%s%s%s", end, rrep, p);
|
|
afree(end, ATEMP);
|
|
sbeg = d + (sbeg - s) + strlen(rrep);
|
|
afree(s, ATEMP);
|
|
s = d;
|
|
if (stype & 0x80)
|
|
goto again_repl;
|
|
end_repl:
|
|
afree(tpat1, ATEMP);
|
|
do_repl:
|
|
x.str = s;
|
|
no_repl:
|
|
afree(pat, ATEMP);
|
|
if (rrep != null)
|
|
afree(rrep, ATEMP);
|
|
goto do_CSUBST;
|
|
}
|
|
case '#':
|
|
case '%':
|
|
/* ! DOBLANK,DOBRACE,DOTILDE */
|
|
f = (f & DONTRUNCOMMAND) |
|
|
DOPAT | DOTEMP | DOSCALAR;
|
|
st->quotew = quote = 0;
|
|
/*
|
|
* Prepend open pattern (so |
|
|
* in a trim will work as
|
|
* expected)
|
|
*/
|
|
if (!Flag(FSH)) {
|
|
*dp++ = MAGIC;
|
|
*dp++ = 0x80 | '@';
|
|
}
|
|
break;
|
|
case '=':
|
|
/*
|
|
* Enabling tilde expansion
|
|
* after :s here is
|
|
* non-standard ksh, but is
|
|
* consistent with rules for
|
|
* other assignments. Not
|
|
* sure what POSIX thinks of
|
|
* this.
|
|
* Not doing tilde expansion
|
|
* for integer variables is a
|
|
* non-POSIX thing - makes
|
|
* sense though, since ~ is
|
|
* a arithmetic operator.
|
|
*/
|
|
if (!(x.var->flag & INTEGER))
|
|
f |= DOASNTILDE | DOTILDE;
|
|
f |= DOTEMP;
|
|
/*
|
|
* These will be done after the
|
|
* value has been assigned.
|
|
*/
|
|
f &= ~(DOBLANK|DOGLOB|DOBRACE);
|
|
tilde_ok = 1;
|
|
break;
|
|
case '?':
|
|
f &= ~DOBLANK;
|
|
f |= DOTEMP;
|
|
/* FALLTHROUGH */
|
|
default:
|
|
/* '-' '+' '?' */
|
|
if (quote)
|
|
word = IFS_WORD;
|
|
else if (dp == Xstring(ds, dp))
|
|
word = IFS_IWS;
|
|
/* Enable tilde expansion */
|
|
tilde_ok = 1;
|
|
f |= DOTILDE;
|
|
}
|
|
} else
|
|
/* skip word */
|
|
sp += wdscan(sp, CSUBST) - sp;
|
|
continue;
|
|
}
|
|
case CSUBST:
|
|
/* only get here if expanding word */
|
|
do_CSUBST:
|
|
/* ({) skip the } or x */
|
|
sp++;
|
|
/* in case of ${unset:-} */
|
|
tilde_ok = 0;
|
|
*dp = '\0';
|
|
quote = st->quotep;
|
|
f = st->f;
|
|
if (f & DOBLANK)
|
|
doblank--;
|
|
switch (st->stype & 0x17F) {
|
|
case '#':
|
|
case '%':
|
|
if (!Flag(FSH)) {
|
|
/* Append end-pattern */
|
|
*dp++ = MAGIC;
|
|
*dp++ = ')';
|
|
}
|
|
*dp = '\0';
|
|
dp = Xrestpos(ds, dp, st->base);
|
|
/*
|
|
* Must use st->var since calling
|
|
* global would break things
|
|
* like x[i+=1].
|
|
*/
|
|
x.str = trimsub(str_val(st->var),
|
|
dp, st->stype);
|
|
if (x.str[0] != '\0') {
|
|
word = IFS_IWS;
|
|
type = XSUB;
|
|
} else
|
|
type = quote ? XSUB : XNULLSUB;
|
|
if (f & DOBLANK)
|
|
doblank++;
|
|
st = st->prev;
|
|
continue;
|
|
case '=':
|
|
/*
|
|
* Restore our position and substitute
|
|
* the value of st->var (may not be
|
|
* the assigned value in the presence
|
|
* of integer/right-adj/etc attributes).
|
|
*/
|
|
dp = Xrestpos(ds, dp, st->base);
|
|
/*
|
|
* Must use st->var since calling
|
|
* global would cause with things
|
|
* like x[i+=1] to be evaluated twice.
|
|
*/
|
|
/*
|
|
* Note: not exported by FEXPORT
|
|
* in AT&T ksh.
|
|
*/
|
|
/*
|
|
* XXX POSIX says readonly is only
|
|
* fatal for special builtins (setstr
|
|
* does readonly check).
|
|
*/
|
|
len = strlen(dp) + 1;
|
|
setstr(st->var,
|
|
debunk(alloc(len, ATEMP),
|
|
dp, len), KSH_UNWIND_ERROR);
|
|
x.str = str_val(st->var);
|
|
type = XSUB;
|
|
if (f & DOBLANK)
|
|
doblank++;
|
|
st = st->prev;
|
|
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS;
|
|
continue;
|
|
case '?': {
|
|
char *s = Xrestpos(ds, dp, st->base);
|
|
|
|
errorf("%s: %s", st->var->name,
|
|
dp == s ?
|
|
"parameter null or not set" :
|
|
(debunk(s, s, strlen(s) + 1), s));
|
|
}
|
|
case '0':
|
|
case '/':
|
|
case 0x100 | '#':
|
|
case 0x100 | 'Q':
|
|
dp = Xrestpos(ds, dp, st->base);
|
|
type = XSUB;
|
|
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS;
|
|
if (f & DOBLANK)
|
|
doblank++;
|
|
st = st->prev;
|
|
continue;
|
|
/* default: '-' '+' */
|
|
}
|
|
st = st->prev;
|
|
type = XBASE;
|
|
continue;
|
|
|
|
case OPAT:
|
|
/* open pattern: *(foo|bar) */
|
|
/* Next char is the type of pattern */
|
|
make_magic = true;
|
|
c = *sp++ | 0x80;
|
|
break;
|
|
|
|
case SPAT:
|
|
/* pattern separator (|) */
|
|
make_magic = true;
|
|
c = '|';
|
|
break;
|
|
|
|
case CPAT:
|
|
/* close pattern */
|
|
make_magic = true;
|
|
c = /*(*/ ')';
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case XNULLSUB:
|
|
/*
|
|
* Special case for "$@" (and "${foo[@]}") - no
|
|
* word is generated if $# is 0 (unless there is
|
|
* other stuff inside the quotes).
|
|
*/
|
|
type = XBASE;
|
|
if (f & DOBLANK) {
|
|
doblank--;
|
|
if (dp == Xstring(ds, dp))
|
|
word = IFS_IWS;
|
|
}
|
|
continue;
|
|
|
|
case XSUB:
|
|
case XSUBMID:
|
|
if ((c = *x.str++) == 0) {
|
|
type = XBASE;
|
|
if (f & DOBLANK)
|
|
doblank--;
|
|
continue;
|
|
}
|
|
break;
|
|
|
|
case XARGSEP:
|
|
type = XARG;
|
|
quote = 1;
|
|
/* FALLTHROUGH */
|
|
case XARG:
|
|
if ((c = *x.str++) == '\0') {
|
|
/*
|
|
* force null words to be created so
|
|
* set -- "" 2 ""; echo "$@" will do
|
|
* the right thing
|
|
*/
|
|
if (quote && x.split)
|
|
word = IFS_WORD;
|
|
if ((x.str = *x.u.strv++) == NULL) {
|
|
type = XBASE;
|
|
if (f & DOBLANK)
|
|
doblank--;
|
|
continue;
|
|
}
|
|
c = ifs0;
|
|
if ((f & DOSCALAR)) {
|
|
/* do not field-split */
|
|
if (x.split) {
|
|
c = ' ';
|
|
break;
|
|
}
|
|
if (c == 0) {
|
|
continue;
|
|
}
|
|
}
|
|
if (c == 0) {
|
|
if (quote && !x.split)
|
|
continue;
|
|
if (!quote && word == IFS_WS)
|
|
continue;
|
|
/* this is so we don't terminate */
|
|
c = ' ';
|
|
/* now force-emit a word */
|
|
goto emit_word;
|
|
}
|
|
if (quote && x.split) {
|
|
/* terminate word for "$@" */
|
|
type = XARGSEP;
|
|
quote = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case XCOM:
|
|
if (x.u.shf == NULL) {
|
|
/* $(<...) failed */
|
|
subst_exstat = 1;
|
|
/* fake EOF */
|
|
c = -1;
|
|
} else if (newlines) {
|
|
/* spit out saved NLs */
|
|
c = '\n';
|
|
--newlines;
|
|
} else {
|
|
while ((c = shf_getc(x.u.shf)) == 0 || c == '\n')
|
|
if (c == '\n')
|
|
/* save newlines */
|
|
newlines++;
|
|
if (newlines && c != -1) {
|
|
shf_ungetc(c, x.u.shf);
|
|
c = '\n';
|
|
--newlines;
|
|
}
|
|
}
|
|
if (c == -1) {
|
|
newlines = 0;
|
|
if (x.u.shf)
|
|
shf_close(x.u.shf);
|
|
if (x.split)
|
|
subst_exstat = waitlast();
|
|
type = XBASE;
|
|
if (f & DOBLANK)
|
|
doblank--;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* check for end of word or IFS separation */
|
|
if (c == 0 || (!quote && (f & DOBLANK) && doblank &&
|
|
!make_magic && ctype(c, C_IFS))) {
|
|
/*-
|
|
* How words are broken up:
|
|
* | value of c
|
|
* word | ws nws 0
|
|
* -----------------------------------
|
|
* IFS_WORD w/WS w/NWS w
|
|
* IFS_WS -/WS -/NWS -
|
|
* IFS_NWS -/NWS w/NWS -
|
|
* IFS_IWS -/WS w/NWS -
|
|
* (w means generate a word)
|
|
*/
|
|
if ((word == IFS_WORD) || (c &&
|
|
(word == IFS_IWS || word == IFS_NWS) &&
|
|
!ctype(c, C_IFSWS))) {
|
|
emit_word:
|
|
*dp++ = '\0';
|
|
cp = Xclose(ds, dp);
|
|
if (fdo & DOBRACE)
|
|
/* also does globbing */
|
|
alt_expand(wp, cp, cp,
|
|
cp + Xlength(ds, (dp - 1)),
|
|
fdo | (f & DOMARKDIRS));
|
|
else if (fdo & DOGLOB)
|
|
glob(cp, wp, tobool(f & DOMARKDIRS));
|
|
else if ((f & DOPAT) || !(fdo & DOMAGIC))
|
|
XPput(*wp, cp);
|
|
else
|
|
XPput(*wp, debunk(cp, cp,
|
|
strlen(cp) + 1));
|
|
fdo = 0;
|
|
saw_eq = false;
|
|
/* must be 1/0 */
|
|
tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0;
|
|
if (c == 0)
|
|
return;
|
|
Xinit(ds, dp, 128, ATEMP);
|
|
} else if (c == 0) {
|
|
return;
|
|
} else if (type == XSUB && ctype(c, C_IFS) &&
|
|
!ctype(c, C_IFSWS) && Xlength(ds, dp) == 0) {
|
|
*(cp = alloc(1, ATEMP)) = '\0';
|
|
XPput(*wp, cp);
|
|
type = XSUBMID;
|
|
}
|
|
if (word != IFS_NWS)
|
|
word = ctype(c, C_IFSWS) ? IFS_WS : IFS_NWS;
|
|
} else {
|
|
if (type == XSUB) {
|
|
if (word == IFS_NWS &&
|
|
Xlength(ds, dp) == 0) {
|
|
*(cp = alloc(1, ATEMP)) = '\0';
|
|
XPput(*wp, cp);
|
|
}
|
|
type = XSUBMID;
|
|
}
|
|
|
|
/* age tilde_ok info - ~ code tests second bit */
|
|
tilde_ok <<= 1;
|
|
/* mark any special second pass chars */
|
|
if (!quote)
|
|
switch (c) {
|
|
case '[':
|
|
case '!':
|
|
case '-':
|
|
case ']':
|
|
/*
|
|
* For character classes - doesn't hurt
|
|
* to have magic !,-,]s outside of
|
|
* [...] expressions.
|
|
*/
|
|
if (f & (DOPAT | DOGLOB)) {
|
|
fdo |= DOMAGIC;
|
|
if (c == '[')
|
|
fdo |= f & DOGLOB;
|
|
*dp++ = MAGIC;
|
|
}
|
|
break;
|
|
case '*':
|
|
case '?':
|
|
if (f & (DOPAT | DOGLOB)) {
|
|
fdo |= DOMAGIC | (f & DOGLOB);
|
|
*dp++ = MAGIC;
|
|
}
|
|
break;
|
|
case '{':
|
|
case '}':
|
|
case ',':
|
|
if ((f & DOBRACE) && (c == '{' /*}*/ ||
|
|
(fdo & DOBRACE))) {
|
|
fdo |= DOBRACE|DOMAGIC;
|
|
*dp++ = MAGIC;
|
|
}
|
|
break;
|
|
case '=':
|
|
/* Note first unquoted = for ~ */
|
|
if (!(f & DOTEMP) && !saw_eq &&
|
|
(Flag(FBRACEEXPAND) ||
|
|
(f & DOASNTILDE))) {
|
|
saw_eq = true;
|
|
tilde_ok = 1;
|
|
}
|
|
break;
|
|
case ':':
|
|
/* : */
|
|
/* Note unquoted : for ~ */
|
|
if (!(f & DOTEMP) && (f & DOASNTILDE))
|
|
tilde_ok = 1;
|
|
break;
|
|
case '~':
|
|
/*
|
|
* tilde_ok is reset whenever
|
|
* any of ' " $( $(( ${ } are seen.
|
|
* Note that tilde_ok must be preserved
|
|
* through the sequence ${A=a=}~
|
|
*/
|
|
if (type == XBASE &&
|
|
(f & (DOTILDE | DOASNTILDE)) &&
|
|
(tilde_ok & 2)) {
|
|
const char *tcp;
|
|
char *tdp = dp;
|
|
|
|
tcp = maybe_expand_tilde(sp,
|
|
&ds, &tdp,
|
|
tobool(f & DOASNTILDE));
|
|
if (tcp) {
|
|
if (dp != tdp)
|
|
word = IFS_WORD;
|
|
dp = tdp;
|
|
sp = tcp;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
else
|
|
/* undo temporary */
|
|
quote &= ~2;
|
|
|
|
if (make_magic) {
|
|
make_magic = false;
|
|
fdo |= DOMAGIC | (f & DOGLOB);
|
|
*dp++ = MAGIC;
|
|
} else if (ISMAGIC(c)) {
|
|
fdo |= DOMAGIC;
|
|
*dp++ = MAGIC;
|
|
}
|
|
/* save output char */
|
|
*dp++ = c;
|
|
word = IFS_WORD;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Prepare to generate the string returned by ${} substitution.
|
|
*/
|
|
static int
|
|
varsub(Expand *xp, const char *sp, const char *word,
|
|
int *stypep, /* becomes qualifier type */
|
|
int *slenp) /* " " len (=, :=, etc.) valid iff *stypep != 0 */
|
|
{
|
|
int c;
|
|
int state; /* next state: XBASE, XARG, XSUB, XNULLSUB */
|
|
int stype; /* substitution type */
|
|
int slen;
|
|
const char *p;
|
|
struct tbl *vp;
|
|
bool zero_ok = false;
|
|
|
|
if ((stype = sp[0]) == '\0')
|
|
/* Bad variable name */
|
|
return (-1);
|
|
|
|
xp->var = NULL;
|
|
|
|
/*-
|
|
* ${#var}, string length (-U: characters, +U: octets) or array size
|
|
* ${%var}, string width (-U: screen columns, +U: octets)
|
|
*/
|
|
c = sp[1];
|
|
if (stype == '%' && c == '\0')
|
|
return (-1);
|
|
if ((stype == '#' || stype == '%') && c != '\0') {
|
|
/* Can't have any modifiers for ${#...} or ${%...} */
|
|
if (*word != CSUBST)
|
|
return (-1);
|
|
sp++;
|
|
/* Check for size of array */
|
|
if ((p = cstrchr(sp, '[')) && (p[1] == '*' || p[1] == '@') &&
|
|
p[2] == ']') {
|
|
int n = 0;
|
|
|
|
if (stype != '#')
|
|
return (-1);
|
|
vp = global(arrayname(sp));
|
|
if (vp->flag & (ISSET|ARRAY))
|
|
zero_ok = true;
|
|
for (; vp; vp = vp->u.array)
|
|
if (vp->flag & ISSET)
|
|
n++;
|
|
c = n;
|
|
} else if (c == '*' || c == '@') {
|
|
if (stype != '#')
|
|
return (-1);
|
|
c = e->loc->argc;
|
|
} else {
|
|
p = str_val(global(sp));
|
|
zero_ok = p != null;
|
|
if (stype == '#')
|
|
c = utflen(p);
|
|
else {
|
|
/* partial utf_mbswidth reimplementation */
|
|
const char *s = p;
|
|
unsigned int wc;
|
|
size_t len;
|
|
int cw;
|
|
|
|
c = 0;
|
|
while (*s) {
|
|
if (!UTFMODE || (len = utf_mbtowc(&wc,
|
|
s)) == (size_t)-1)
|
|
/* not UTFMODE or not UTF-8 */
|
|
wc = (unsigned char)(*s++);
|
|
else
|
|
/* UTFMODE and UTF-8 */
|
|
s += len;
|
|
/* wc == char or wchar at s++ */
|
|
if ((cw = utf_wcwidth(wc)) == -1) {
|
|
/* 646, 8859-1, 10646 C0/C1 */
|
|
c = -1;
|
|
break;
|
|
}
|
|
c += cw;
|
|
}
|
|
}
|
|
}
|
|
if (Flag(FNOUNSET) && c == 0 && !zero_ok)
|
|
errorf("%s: %s", sp, "parameter not set");
|
|
/* unqualified variable/string substitution */
|
|
*stypep = 0;
|
|
xp->str = shf_smprintf("%d", c);
|
|
return (XSUB);
|
|
}
|
|
|
|
/* Check for qualifiers in word part */
|
|
stype = 0;
|
|
c = word[slen = 0] == CHAR ? word[1] : 0;
|
|
if (c == ':') {
|
|
slen += 2;
|
|
stype = 0x80;
|
|
c = word[slen + 0] == CHAR ? word[slen + 1] : 0;
|
|
}
|
|
if (!stype && c == '/') {
|
|
slen += 2;
|
|
stype = c;
|
|
if (word[slen] == ADELIM) {
|
|
slen += 2;
|
|
stype |= 0x80;
|
|
}
|
|
} else if (stype == 0x80 && (c == ' ' || c == '0')) {
|
|
stype |= '0';
|
|
} else if (ctype(c, C_SUBOP1)) {
|
|
slen += 2;
|
|
stype |= c;
|
|
} else if (ctype(c, C_SUBOP2)) {
|
|
/* Note: ksh88 allows :%, :%%, etc */
|
|
slen += 2;
|
|
stype = c;
|
|
if (word[slen + 0] == CHAR && c == word[slen + 1]) {
|
|
stype |= 0x80;
|
|
slen += 2;
|
|
}
|
|
} else if (c == '@') {
|
|
/* @x where x is command char */
|
|
slen += 2;
|
|
stype |= 0x100;
|
|
if (word[slen] == CHAR) {
|
|
stype |= word[slen + 1];
|
|
slen += 2;
|
|
}
|
|
} else if (stype)
|
|
/* : is not ok */
|
|
return (-1);
|
|
if (!stype && *word != CSUBST)
|
|
return (-1);
|
|
*stypep = stype;
|
|
*slenp = slen;
|
|
|
|
c = sp[0];
|
|
if (c == '*' || c == '@') {
|
|
switch (stype & 0x17F) {
|
|
/* can't assign to a vector */
|
|
case '=':
|
|
/* can't trim a vector (yet) */
|
|
case '%':
|
|
case '#':
|
|
case '0':
|
|
case '/':
|
|
case 0x100 | '#':
|
|
case 0x100 | 'Q':
|
|
return (-1);
|
|
}
|
|
if (e->loc->argc == 0) {
|
|
xp->str = null;
|
|
xp->var = global(sp);
|
|
state = c == '@' ? XNULLSUB : XSUB;
|
|
} else {
|
|
xp->u.strv = (const char **)e->loc->argv + 1;
|
|
xp->str = *xp->u.strv++;
|
|
/* $@ */
|
|
xp->split = tobool(c == '@');
|
|
state = XARG;
|
|
}
|
|
/* POSIX 2009? */
|
|
zero_ok = true;
|
|
} else {
|
|
if ((p = cstrchr(sp, '[')) && (p[1] == '*' || p[1] == '@') &&
|
|
p[2] == ']') {
|
|
XPtrV wv;
|
|
|
|
switch (stype & 0x17F) {
|
|
/* can't assign to a vector */
|
|
case '=':
|
|
/* can't trim a vector (yet) */
|
|
case '%':
|
|
case '#':
|
|
case '?':
|
|
case '0':
|
|
case '/':
|
|
case 0x100 | '#':
|
|
case 0x100 | 'Q':
|
|
return (-1);
|
|
}
|
|
XPinit(wv, 32);
|
|
if ((c = sp[0]) == '!')
|
|
++sp;
|
|
vp = global(arrayname(sp));
|
|
for (; vp; vp = vp->u.array) {
|
|
if (!(vp->flag&ISSET))
|
|
continue;
|
|
XPput(wv, c == '!' ? shf_smprintf("%lu",
|
|
arrayindex(vp)) :
|
|
str_val(vp));
|
|
}
|
|
if (XPsize(wv) == 0) {
|
|
xp->str = null;
|
|
state = p[1] == '@' ? XNULLSUB : XSUB;
|
|
XPfree(wv);
|
|
} else {
|
|
XPput(wv, 0);
|
|
xp->u.strv = (const char **)XPptrv(wv);
|
|
xp->str = *xp->u.strv++;
|
|
/* ${foo[@]} */
|
|
xp->split = tobool(p[1] == '@');
|
|
state = XARG;
|
|
}
|
|
} else {
|
|
/* Can't assign things like $! or $1 */
|
|
if ((stype & 0x17F) == '=' &&
|
|
ctype(*sp, C_VAR1 | C_DIGIT))
|
|
return (-1);
|
|
if (*sp == '!' && sp[1]) {
|
|
++sp;
|
|
xp->var = global(sp);
|
|
if (vstrchr(sp, '['))
|
|
xp->str = shf_smprintf("%s[%lu]",
|
|
xp->var->name,
|
|
arrayindex(xp->var));
|
|
else
|
|
xp->str = xp->var->name;
|
|
} else {
|
|
xp->var = global(sp);
|
|
xp->str = str_val(xp->var);
|
|
}
|
|
state = XSUB;
|
|
}
|
|
}
|
|
|
|
c = stype & 0x7F;
|
|
/* test the compiler's code generator */
|
|
if (((stype < 0x100) && (ctype(c, C_SUBOP2) || c == '/' ||
|
|
(((stype&0x80) ? *xp->str=='\0' : xp->str==null) ? /* undef? */
|
|
c == '=' || c == '-' || c == '?' : c == '+'))) ||
|
|
stype == (0x80 | '0') || stype == (0x100 | '#') ||
|
|
stype == (0x100 | 'Q'))
|
|
/* expand word instead of variable value */
|
|
state = XBASE;
|
|
if (Flag(FNOUNSET) && xp->str == null && !zero_ok &&
|
|
(ctype(c, C_SUBOP2) || (state != XBASE && c != '+')))
|
|
errorf("%s: %s", sp, "parameter not set");
|
|
return (state);
|
|
}
|
|
|
|
/*
|
|
* Run the command in $(...) and read its output.
|
|
*/
|
|
static int
|
|
comsub(Expand *xp, const char *cp, int fn MKSH_A_UNUSED)
|
|
{
|
|
Source *s, *sold;
|
|
struct op *t;
|
|
struct shf *shf;
|
|
uint8_t old_utfmode = UTFMODE;
|
|
|
|
s = pushs(SSTRING, ATEMP);
|
|
s->start = s->str = cp;
|
|
sold = source;
|
|
t = compile(s, true);
|
|
afree(s, ATEMP);
|
|
source = sold;
|
|
|
|
UTFMODE = old_utfmode;
|
|
|
|
if (t == NULL)
|
|
return (XBASE);
|
|
|
|
/* no waitlast() unless specifically enabled later */
|
|
xp->split = false;
|
|
|
|
if (t->type == TCOM &&
|
|
*t->args == NULL && *t->vars == NULL && t->ioact != NULL) {
|
|
/* $(<file) */
|
|
struct ioword *io = *t->ioact;
|
|
char *name;
|
|
|
|
if ((io->flag & IOTYPE) != IOREAD)
|
|
errorf("%s: %s", "funny $() command",
|
|
snptreef(NULL, 32, "%R", io));
|
|
shf = shf_open(name = evalstr(io->name, DOTILDE), O_RDONLY, 0,
|
|
SHF_MAPHI|SHF_CLEXEC);
|
|
if (shf == NULL)
|
|
warningf(!Flag(FTALKING), "%s: %s %s: %s", name,
|
|
"can't open", "$(<...) input", cstrerror(errno));
|
|
} else if (fn == FUNSUB) {
|
|
int ofd1;
|
|
struct temp *tf = NULL;
|
|
|
|
/*
|
|
* create a temporary file, open for reading and writing,
|
|
* with an shf open for reading (buffered) but yet unused
|
|
*/
|
|
maketemp(ATEMP, TT_FUNSUB, &tf);
|
|
if (!tf->shf) {
|
|
errorf("can't %s temporary file %s: %s",
|
|
"create", tf->tffn, cstrerror(errno));
|
|
}
|
|
/* extract shf from temporary file, unlink and free it */
|
|
shf = tf->shf;
|
|
unlink(tf->tffn);
|
|
afree(tf, ATEMP);
|
|
/* save stdout and let it point to the tempfile */
|
|
ofd1 = savefd(1);
|
|
ksh_dup2(shf_fileno(shf), 1, false);
|
|
/*
|
|
* run tree, with output thrown into the tempfile,
|
|
* in a new function block
|
|
*/
|
|
valsub(t, NULL);
|
|
subst_exstat = exstat & 0xFF;
|
|
/* rewind the tempfile and restore regular stdout */
|
|
lseek(shf_fileno(shf), (off_t)0, SEEK_SET);
|
|
restfd(1, ofd1);
|
|
} else if (fn == VALSUB) {
|
|
xp->str = valsub(t, ATEMP);
|
|
subst_exstat = exstat & 0xFF;
|
|
return (XSUB);
|
|
} else {
|
|
int ofd1, pv[2];
|
|
|
|
openpipe(pv);
|
|
shf = shf_fdopen(pv[0], SHF_RD, NULL);
|
|
ofd1 = savefd(1);
|
|
if (pv[1] != 1) {
|
|
ksh_dup2(pv[1], 1, false);
|
|
close(pv[1]);
|
|
}
|
|
execute(t, XXCOM | XPIPEO | XFORK, NULL);
|
|
restfd(1, ofd1);
|
|
startlast();
|
|
/* waitlast() */
|
|
xp->split = true;
|
|
}
|
|
|
|
xp->u.shf = shf;
|
|
return (XCOM);
|
|
}
|
|
|
|
/*
|
|
* perform #pattern and %pattern substitution in ${}
|
|
*/
|
|
static char *
|
|
trimsub(char *str, char *pat, int how)
|
|
{
|
|
char *end = strnul(str);
|
|
char *p, c;
|
|
|
|
switch (how & 0xFF) {
|
|
case '#':
|
|
/* shortest match at beginning */
|
|
for (p = str; p <= end; p += utf_ptradj(p)) {
|
|
c = *p; *p = '\0';
|
|
if (gmatchx(str, pat, false)) {
|
|
*p = c;
|
|
return (p);
|
|
}
|
|
*p = c;
|
|
}
|
|
break;
|
|
case '#'|0x80:
|
|
/* longest match at beginning */
|
|
for (p = end; p >= str; p--) {
|
|
c = *p; *p = '\0';
|
|
if (gmatchx(str, pat, false)) {
|
|
*p = c;
|
|
return (p);
|
|
}
|
|
*p = c;
|
|
}
|
|
break;
|
|
case '%':
|
|
/* shortest match at end */
|
|
p = end;
|
|
while (p >= str) {
|
|
if (gmatchx(p, pat, false))
|
|
goto trimsub_match;
|
|
if (UTFMODE) {
|
|
char *op = p;
|
|
while ((p-- > str) && ((*p & 0xC0) == 0x80))
|
|
;
|
|
if ((p < str) || (p + utf_ptradj(p) != op))
|
|
p = op - 1;
|
|
} else
|
|
--p;
|
|
}
|
|
break;
|
|
case '%'|0x80:
|
|
/* longest match at end */
|
|
for (p = str; p <= end; p++)
|
|
if (gmatchx(p, pat, false)) {
|
|
trimsub_match:
|
|
strndupx(end, str, p - str, ATEMP);
|
|
return (end);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* no match, return string */
|
|
return (str);
|
|
}
|
|
|
|
/*
|
|
* glob
|
|
* Name derived from V6's /etc/glob, the program that expanded filenames.
|
|
*/
|
|
|
|
/* XXX cp not const 'cause slashes are temporarily replaced with NULs... */
|
|
static void
|
|
glob(char *cp, XPtrV *wp, bool markdirs)
|
|
{
|
|
int oldsize = XPsize(*wp);
|
|
|
|
if (glob_str(cp, wp, markdirs) == 0)
|
|
XPput(*wp, debunk(cp, cp, strlen(cp) + 1));
|
|
else
|
|
qsort(XPptrv(*wp) + oldsize, XPsize(*wp) - oldsize,
|
|
sizeof(void *), xstrcmp);
|
|
}
|
|
|
|
#define GF_NONE 0
|
|
#define GF_EXCHECK BIT(0) /* do existence check on file */
|
|
#define GF_GLOBBED BIT(1) /* some globbing has been done */
|
|
#define GF_MARKDIR BIT(2) /* add trailing / to directories */
|
|
|
|
/*
|
|
* Apply file globbing to cp and store the matching files in wp. Returns
|
|
* the number of matches found.
|
|
*/
|
|
int
|
|
glob_str(char *cp, XPtrV *wp, bool markdirs)
|
|
{
|
|
int oldsize = XPsize(*wp);
|
|
XString xs;
|
|
char *xp;
|
|
|
|
Xinit(xs, xp, 256, ATEMP);
|
|
globit(&xs, &xp, cp, wp, markdirs ? GF_MARKDIR : GF_NONE);
|
|
Xfree(xs, xp);
|
|
|
|
return (XPsize(*wp) - oldsize);
|
|
}
|
|
|
|
static void
|
|
globit(XString *xs, /* dest string */
|
|
char **xpp, /* ptr to dest end */
|
|
char *sp, /* source path */
|
|
XPtrV *wp, /* output list */
|
|
int check) /* GF_* flags */
|
|
{
|
|
char *np; /* next source component */
|
|
char *xp = *xpp;
|
|
char *se;
|
|
char odirsep;
|
|
|
|
/* This to allow long expansions to be interrupted */
|
|
intrcheck();
|
|
|
|
if (sp == NULL) {
|
|
/* end of source path */
|
|
/*
|
|
* We only need to check if the file exists if a pattern
|
|
* is followed by a non-pattern (eg, foo*x/bar; no check
|
|
* is needed for foo* since the match must exist) or if
|
|
* any patterns were expanded and the markdirs option is set.
|
|
* Symlinks make things a bit tricky...
|
|
*/
|
|
if ((check & GF_EXCHECK) ||
|
|
((check & GF_MARKDIR) && (check & GF_GLOBBED))) {
|
|
#define stat_check() (stat_done ? stat_done : (stat_done = \
|
|
stat(Xstring(*xs, xp), &statb) < 0 ? -1 : 1))
|
|
struct stat lstatb, statb;
|
|
/* -1: failed, 1 ok, 0 not yet done */
|
|
int stat_done = 0;
|
|
|
|
if (mksh_lstat(Xstring(*xs, xp), &lstatb) < 0)
|
|
return;
|
|
/*
|
|
* special case for systems which strip trailing
|
|
* slashes from regular files (eg, /etc/passwd/).
|
|
* SunOS 4.1.3 does this...
|
|
*/
|
|
if ((check & GF_EXCHECK) && xp > Xstring(*xs, xp) &&
|
|
xp[-1] == '/' && !S_ISDIR(lstatb.st_mode) &&
|
|
(!S_ISLNK(lstatb.st_mode) ||
|
|
stat_check() < 0 || !S_ISDIR(statb.st_mode)))
|
|
return;
|
|
/*
|
|
* Possibly tack on a trailing / if there isn't already
|
|
* one and if the file is a directory or a symlink to a
|
|
* directory
|
|
*/
|
|
if (((check & GF_MARKDIR) && (check & GF_GLOBBED)) &&
|
|
xp > Xstring(*xs, xp) && xp[-1] != '/' &&
|
|
(S_ISDIR(lstatb.st_mode) ||
|
|
(S_ISLNK(lstatb.st_mode) && stat_check() > 0 &&
|
|
S_ISDIR(statb.st_mode)))) {
|
|
*xp++ = '/';
|
|
*xp = '\0';
|
|
}
|
|
}
|
|
strndupx(np, Xstring(*xs, xp), Xlength(*xs, xp), ATEMP);
|
|
XPput(*wp, np);
|
|
return;
|
|
}
|
|
|
|
if (xp > Xstring(*xs, xp))
|
|
*xp++ = '/';
|
|
while (*sp == '/') {
|
|
Xcheck(*xs, xp);
|
|
*xp++ = *sp++;
|
|
}
|
|
np = strchr(sp, '/');
|
|
if (np != NULL) {
|
|
se = np;
|
|
/* don't assume '/', can be multiple kinds */
|
|
odirsep = *np;
|
|
*np++ = '\0';
|
|
} else {
|
|
odirsep = '\0'; /* keep gcc quiet */
|
|
se = sp + strlen(sp);
|
|
}
|
|
|
|
|
|
/*
|
|
* Check if sp needs globbing - done to avoid pattern checks for strings
|
|
* containing MAGIC characters, open [s without the matching close ],
|
|
* etc. (otherwise opendir() will be called which may fail because the
|
|
* directory isn't readable - if no globbing is needed, only execute
|
|
* permission should be required (as per POSIX)).
|
|
*/
|
|
if (!has_globbing(sp, se)) {
|
|
XcheckN(*xs, xp, se - sp + 1);
|
|
debunk(xp, sp, Xnleft(*xs, xp));
|
|
xp += strlen(xp);
|
|
*xpp = xp;
|
|
globit(xs, xpp, np, wp, check);
|
|
} else {
|
|
DIR *dirp;
|
|
struct dirent *d;
|
|
char *name;
|
|
size_t len, prefix_len;
|
|
|
|
/* xp = *xpp; copy_non_glob() may have re-alloc'd xs */
|
|
*xp = '\0';
|
|
prefix_len = Xlength(*xs, xp);
|
|
dirp = opendir(prefix_len ? Xstring(*xs, xp) : ".");
|
|
if (dirp == NULL)
|
|
goto Nodir;
|
|
while ((d = readdir(dirp)) != NULL) {
|
|
name = d->d_name;
|
|
if (name[0] == '.' &&
|
|
(name[1] == 0 || (name[1] == '.' && name[2] == 0)))
|
|
/* always ignore . and .. */
|
|
continue;
|
|
if ((*name == '.' && *sp != '.') ||
|
|
!gmatchx(name, sp, true))
|
|
continue;
|
|
|
|
len = strlen(d->d_name) + 1;
|
|
XcheckN(*xs, xp, len);
|
|
memcpy(xp, name, len);
|
|
*xpp = xp + len - 1;
|
|
globit(xs, xpp, np, wp,
|
|
(check & GF_MARKDIR) | GF_GLOBBED
|
|
| (np ? GF_EXCHECK : GF_NONE));
|
|
xp = Xstring(*xs, xp) + prefix_len;
|
|
}
|
|
closedir(dirp);
|
|
Nodir:
|
|
;
|
|
}
|
|
|
|
if (np != NULL)
|
|
*--np = odirsep;
|
|
}
|
|
|
|
/* remove MAGIC from string */
|
|
char *
|
|
debunk(char *dp, const char *sp, size_t dlen)
|
|
{
|
|
char *d;
|
|
const char *s;
|
|
|
|
if ((s = cstrchr(sp, MAGIC))) {
|
|
if (s - sp >= (ssize_t)dlen)
|
|
return (dp);
|
|
memmove(dp, sp, s - sp);
|
|
for (d = dp + (s - sp); *s && (d - dp < (ssize_t)dlen); s++)
|
|
if (!ISMAGIC(*s) || !(*++s & 0x80) ||
|
|
!vstrchr("*+?@! ", *s & 0x7f))
|
|
*d++ = *s;
|
|
else {
|
|
/* extended pattern operators: *+?@! */
|
|
if ((*s & 0x7f) != ' ')
|
|
*d++ = *s & 0x7f;
|
|
if (d - dp < (ssize_t)dlen)
|
|
*d++ = '(';
|
|
}
|
|
*d = '\0';
|
|
} else if (dp != sp)
|
|
strlcpy(dp, sp, dlen);
|
|
return (dp);
|
|
}
|
|
|
|
/*
|
|
* Check if p is an unquoted name, possibly followed by a / or :. If so
|
|
* puts the expanded version in *dcp,dp and returns a pointer in p just
|
|
* past the name, otherwise returns 0.
|
|
*/
|
|
static const char *
|
|
maybe_expand_tilde(const char *p, XString *dsp, char **dpp, bool isassign)
|
|
{
|
|
XString ts;
|
|
char *dp = *dpp;
|
|
char *tp;
|
|
const char *r;
|
|
|
|
Xinit(ts, tp, 16, ATEMP);
|
|
/* : only for DOASNTILDE form */
|
|
while (p[0] == CHAR && p[1] != '/' && (!isassign || p[1] != ':'))
|
|
{
|
|
Xcheck(ts, tp);
|
|
*tp++ = p[1];
|
|
p += 2;
|
|
}
|
|
*tp = '\0';
|
|
r = (p[0] == EOS || p[0] == CHAR || p[0] == CSUBST) ?
|
|
do_tilde(Xstring(ts, tp)) : NULL;
|
|
Xfree(ts, tp);
|
|
if (r) {
|
|
while (*r) {
|
|
Xcheck(*dsp, dp);
|
|
if (ISMAGIC(*r))
|
|
*dp++ = MAGIC;
|
|
*dp++ = *r++;
|
|
}
|
|
*dpp = dp;
|
|
r = p;
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
/*
|
|
* tilde expansion
|
|
*
|
|
* based on a version by Arnold Robbins
|
|
*/
|
|
|
|
char *
|
|
do_tilde(char *cp)
|
|
{
|
|
char *dp = null;
|
|
|
|
if (cp[0] == '\0')
|
|
dp = str_val(global("HOME"));
|
|
else if (cp[0] == '+' && cp[1] == '\0')
|
|
dp = str_val(global("PWD"));
|
|
else if (cp[0] == '-' && cp[1] == '\0')
|
|
dp = str_val(global("OLDPWD"));
|
|
#ifndef MKSH_NOPWNAM
|
|
else
|
|
dp = homedir(cp);
|
|
#endif
|
|
/* If HOME, PWD or OLDPWD are not set, don't expand ~ */
|
|
return (dp == null ? NULL : dp);
|
|
}
|
|
|
|
#ifndef MKSH_NOPWNAM
|
|
/*
|
|
* map userid to user's home directory.
|
|
* note that 4.3's getpw adds more than 6K to the shell,
|
|
* and the YP version probably adds much more.
|
|
* we might consider our own version of getpwnam() to keep the size down.
|
|
*/
|
|
static char *
|
|
homedir(char *name)
|
|
{
|
|
struct tbl *ap;
|
|
|
|
ap = ktenter(&homedirs, name, hash(name));
|
|
if (!(ap->flag & ISSET)) {
|
|
struct passwd *pw;
|
|
|
|
pw = getpwnam(name);
|
|
if (pw == NULL)
|
|
return (NULL);
|
|
strdupx(ap->val.s, pw->pw_dir, APERM);
|
|
ap->flag |= DEFINED|ISSET|ALLOC;
|
|
}
|
|
return (ap->val.s);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
alt_expand(XPtrV *wp, char *start, char *exp_start, char *end, int fdo)
|
|
{
|
|
unsigned int count = 0;
|
|
char *brace_start, *brace_end, *comma = NULL;
|
|
char *field_start;
|
|
char *p = exp_start;
|
|
|
|
/* search for open brace */
|
|
while ((p = strchr(p, MAGIC)) && p[1] != '{' /*}*/)
|
|
p += 2;
|
|
brace_start = p;
|
|
|
|
/* find matching close brace, if any */
|
|
if (p) {
|
|
comma = NULL;
|
|
count = 1;
|
|
p += 2;
|
|
while (*p && count) {
|
|
if (ISMAGIC(*p++)) {
|
|
if (*p == '{' /*}*/)
|
|
++count;
|
|
else if (*p == /*{*/ '}')
|
|
--count;
|
|
else if (*p == ',' && count == 1)
|
|
comma = p;
|
|
++p;
|
|
}
|
|
}
|
|
}
|
|
/* no valid expansions... */
|
|
if (!p || count != 0) {
|
|
/*
|
|
* Note that given a{{b,c} we do not expand anything (this is
|
|
* what AT&T ksh does. This may be changed to do the {b,c}
|
|
* expansion. }
|
|
*/
|
|
if (fdo & DOGLOB)
|
|
glob(start, wp, tobool(fdo & DOMARKDIRS));
|
|
else
|
|
XPput(*wp, debunk(start, start, end - start));
|
|
return;
|
|
}
|
|
brace_end = p;
|
|
if (!comma) {
|
|
alt_expand(wp, start, brace_end, end, fdo);
|
|
return;
|
|
}
|
|
|
|
/* expand expression */
|
|
field_start = brace_start + 2;
|
|
count = 1;
|
|
for (p = brace_start + 2; p != brace_end; p++) {
|
|
if (ISMAGIC(*p)) {
|
|
if (*++p == '{' /*}*/)
|
|
++count;
|
|
else if ((*p == /*{*/ '}' && --count == 0) ||
|
|
(*p == ',' && count == 1)) {
|
|
char *news;
|
|
int l1, l2, l3;
|
|
|
|
/*
|
|
* addition safe since these operate on
|
|
* one string (separate substrings)
|
|
*/
|
|
l1 = brace_start - start;
|
|
l2 = (p - 1) - field_start;
|
|
l3 = end - brace_end;
|
|
news = alloc(l1 + l2 + l3 + 1, ATEMP);
|
|
memcpy(news, start, l1);
|
|
memcpy(news + l1, field_start, l2);
|
|
memcpy(news + l1 + l2, brace_end, l3);
|
|
news[l1 + l2 + l3] = '\0';
|
|
alt_expand(wp, news, news + l1,
|
|
news + l1 + l2 + l3, fdo);
|
|
field_start = p + 1;
|
|
}
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* helper function due to setjmp/longjmp woes */
|
|
static char *
|
|
valsub(struct op *t, Area *ap)
|
|
{
|
|
char * volatile cp = NULL;
|
|
struct tbl * volatile vp = NULL;
|
|
|
|
newenv(E_FUNC);
|
|
newblock();
|
|
if (ap)
|
|
vp = local("REPLY", false);
|
|
if (!kshsetjmp(e->jbuf))
|
|
execute(t, XXCOM | XERROK, NULL);
|
|
if (vp)
|
|
strdupx(cp, str_val(vp), ap);
|
|
quitenv(NULL);
|
|
|
|
return (cp);
|
|
}
|