2114 lines
47 KiB
C
2114 lines
47 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, 2016, 2017, 2018,
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* 2019, 2020
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* mirabilos <m@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 "config.h"
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.231 2020/05/05 21:34:27 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 $() */
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bool split;
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} Expand;
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#define XBASE 0 /* scanning original string */
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||
#define XARGSEP 1 /* ifs0 between "$*" */
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#define XARG 2 /* expanding $*, $@ */
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#define XCOM 3 /* expanding $() */
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#define XNULLSUB 4 /* "$@" when $# is 0, so don't generate word */
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#define XSUB 5 /* expanding ${} string */
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||
#define XSUBMID 6 /* middle of expanding ${}; must be XSUB+1 */
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#define XSUBPAT 7 /* expanding [[ x = ${} ]] string */
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#define XSUBPATMID 8 /* middle, must be XSUBPAT+1 */
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||
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#define isXSUB(t) ((t) == XSUB || (t) == XSUBPAT)
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/* States used for field splitting */
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#define IFS_WORD 0 /* word has chars (or quotes except "$@") */
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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 /* beginning of word, ignore IFS WS */
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#define IFS_QUOTE 4 /* beg.w/quote, become IFS_WORD unless "$@" */
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#define STYPE_CHAR 0xFF
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#define STYPE_DBL 0x100
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#define STYPE_AT 0x200
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#define STYPE_SINGLE 0x2FF
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#define STYPE_MASK 0x300
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static int varsub(Expand *, const char *, const char *, unsigned 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 */
|
||
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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|
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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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||
|
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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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|
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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(Tbadsubst);
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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);
|
||
return (rv);
|
||
}
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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..} */
|
||
struct SubType *prev; /* old type */
|
||
struct SubType *next; /* poped type (to avoid re-allocating) */
|
||
size_t base; /* start position of expanded word */
|
||
unsigned short stype; /* [=+-?%#] action after expanded word */
|
||
short f; /* saved value of f (DOPAT, etc) */
|
||
uint8_t quotep; /* saved value of quote (for ${..[%#]..}) */
|
||
uint8_t quotew; /* saved value of quote (for ${..[+-=]..}) */
|
||
} SubType;
|
||
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||
void
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||
expand(
|
||
/* input word */
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||
const char *ccp,
|
||
/* output words */
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||
XPtrV *wp,
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||
/* DO* flags */
|
||
int f)
|
||
{
|
||
int c = 0;
|
||
/* expansion type */
|
||
int type;
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||
/* quoted */
|
||
int quote = 0;
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||
/* destination string and live pointer */
|
||
XString ds;
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||
char *dp;
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||
/* source */
|
||
const char *sp;
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||
/* second pass flags */
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||
int fdo;
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||
/* have word */
|
||
int word;
|
||
/* 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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||
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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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||
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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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||
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||
while (/* CONSTCOND */ 1) {
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||
Xcheck(ds, dp);
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||
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||
switch (type) {
|
||
case XBASE:
|
||
/* original prefixed string */
|
||
c = ord(*sp++);
|
||
switch (c) {
|
||
case EOS:
|
||
c = 0;
|
||
break;
|
||
case CHAR:
|
||
c = ord(*sp++);
|
||
break;
|
||
case QCHAR:
|
||
/* temporary quote */
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||
quote |= 2;
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||
c = ord(*sp++);
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||
break;
|
||
case OQUOTE:
|
||
if (word != IFS_WORD)
|
||
word = IFS_QUOTE;
|
||
tilde_ok = 0;
|
||
quote = 1;
|
||
continue;
|
||
case CQUOTE:
|
||
if (word == IFS_QUOTE)
|
||
word = IFS_WORD;
|
||
quote = st->quotew;
|
||
continue;
|
||
case COMASUB:
|
||
case COMSUB:
|
||
case FUNASUB:
|
||
case FUNSUB:
|
||
case VALSUB:
|
||
tilde_ok = 0;
|
||
if (f & DONTRUNCOMMAND) {
|
||
word = IFS_WORD;
|
||
*dp++ = '$';
|
||
switch (c) {
|
||
case COMASUB:
|
||
case COMSUB:
|
||
*dp++ = '(';
|
||
c = ORD(')');
|
||
break;
|
||
case FUNASUB:
|
||
case FUNSUB:
|
||
case VALSUB:
|
||
*dp++ = '{';
|
||
*dp++ = c == VALSUB ? '|' : ' ';
|
||
c = ORD('}');
|
||
break;
|
||
}
|
||
while (*sp != '\0') {
|
||
Xcheck(ds, dp);
|
||
*dp++ = *sp++;
|
||
}
|
||
if ((unsigned int)c == ORD(/*{*/'}'))
|
||
*dp++ = ';';
|
||
*dp++ = c;
|
||
} else {
|
||
type = comsub(&x, sp, c);
|
||
if (type != XBASE && (f & DOBLANK))
|
||
doblank++;
|
||
sp = strnul(sp) + 1;
|
||
newlines = 0;
|
||
}
|
||
continue;
|
||
case EXPRSUB:
|
||
tilde_ok = 0;
|
||
if (f & DONTRUNCOMMAND) {
|
||
word = IFS_WORD;
|
||
*dp++ = '$'; *dp++ = '('; *dp++ = '(';
|
||
while (*sp != '\0') {
|
||
Xcheck(ds, dp);
|
||
*dp++ = *sp++;
|
||
}
|
||
*dp++ = ')'; *dp++ = ')';
|
||
} else {
|
||
struct tbl v;
|
||
|
||
v.flag = DEFINED|ISSET|INTEGER;
|
||
/* not default */
|
||
v.type = 10;
|
||
v.name[0] = '\0';
|
||
v_evaluate(&v, substitute(sp, 0),
|
||
KSH_UNWIND_ERROR, true);
|
||
sp = strnul(sp) + 1;
|
||
x.str = str_val(&v);
|
||
type = XSUB;
|
||
if (f & DOBLANK)
|
||
doblank++;
|
||
}
|
||
continue;
|
||
case OSUBST: {
|
||
/* ${{#}var{:}[=+-?#%]word} */
|
||
/*-
|
||
* format is:
|
||
* OSUBST [{x] plain-variable-part \0
|
||
* compiled-word-part CSUBST [}x]
|
||
* This is where all syntax checking gets done...
|
||
*/
|
||
/* skip the { or x (}) */
|
||
const char *varname = ++sp;
|
||
unsigned int stype;
|
||
int slen = 0;
|
||
|
||
/* skip variable */
|
||
sp = cstrchr(sp, '\0') + 1;
|
||
type = varsub(&x, varname, sp, &stype, &slen);
|
||
if (type < 0) {
|
||
char *beg, *end, *str;
|
||
unwind_substsyn:
|
||
/* restore sp */
|
||
sp = varname - 2;
|
||
beg = wdcopy(sp, ATEMP);
|
||
end = (wdscan(cstrchr(sp, '\0') + 1,
|
||
CSUBST) - sp) + beg;
|
||
/* ({) the } or x is already skipped */
|
||
if (end < wdscan(beg, EOS))
|
||
*end = EOS;
|
||
str = snptreef(NULL, 64, Tf_S, beg);
|
||
afree(beg, ATEMP);
|
||
errorf(Tf_sD_s, str, Tbadsubst);
|
||
}
|
||
if (f & DOBLANK)
|
||
doblank++;
|
||
tilde_ok = 0;
|
||
if (word == IFS_QUOTE && type != XNULLSUB)
|
||
word = IFS_WORD;
|
||
if (type == XBASE) {
|
||
/* expand? */
|
||
if (!st->next) {
|
||
SubType *newst;
|
||
|
||
newst = alloc(sizeof(SubType), ATEMP);
|
||
newst->next = NULL;
|
||
newst->prev = st;
|
||
st->next = newst;
|
||
}
|
||
st = st->next;
|
||
st->stype = stype;
|
||
st->base = Xsavepos(ds, dp);
|
||
st->f = f;
|
||
if (x.var == vtemp) {
|
||
st->var = tempvar(vtemp->name);
|
||
st->var->flag &= ~INTEGER;
|
||
/* can't fail here */
|
||
setstr(st->var,
|
||
str_val(x.var),
|
||
KSH_RETURN_ERROR | 0x4);
|
||
} else
|
||
st->var = x.var;
|
||
|
||
st->quotew = st->quotep = quote;
|
||
/* skip qualifier(s) */
|
||
if (stype)
|
||
sp += slen;
|
||
switch (stype & STYPE_SINGLE) {
|
||
case ORD('#') | STYPE_AT:
|
||
case ORD('Q') | STYPE_AT:
|
||
break;
|
||
case ORD('0'): {
|
||
char *beg, *mid, *end, *stg;
|
||
mksh_ari_t from = 0, num = -1, flen, finc = 0;
|
||
|
||
beg = wdcopy(sp, ATEMP);
|
||
mid = beg + (wdscan(sp, ADELIM) - sp);
|
||
stg = beg + (wdscan(sp, CSUBST) - sp);
|
||
mid[-2] = EOS;
|
||
if (ord(mid[-1]) == ORD(/*{*/ '}')) {
|
||
sp += mid - beg - 1;
|
||
end = NULL;
|
||
} else {
|
||
end = mid +
|
||
(wdscan(mid, ADELIM) - mid);
|
||
if (ord(end[-1]) != ORD(/*{*/ '}'))
|
||
/* more than max delimiters */
|
||
goto unwind_substsyn;
|
||
end[-2] = EOS;
|
||
sp += end - beg - 1;
|
||
}
|
||
evaluate(substitute(stg = wdstrip(beg, 0), 0),
|
||
&from, KSH_UNWIND_ERROR, true);
|
||
afree(stg, ATEMP);
|
||
if (end) {
|
||
evaluate(substitute(stg = wdstrip(mid, 0), 0),
|
||
&num, KSH_UNWIND_ERROR, true);
|
||
afree(stg, ATEMP);
|
||
}
|
||
afree(beg, ATEMP);
|
||
beg = str_val(st->var);
|
||
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)
|
||
num = flen;
|
||
if (UTFMODE)
|
||
utfincptr(beg, &num);
|
||
strndupx(x.str, beg, num, ATEMP);
|
||
goto do_CSUBST;
|
||
}
|
||
case ORD('/') | STYPE_AT:
|
||
case ORD('/'): {
|
||
char *s, *p, *d, *sbeg;
|
||
char *pat = NULL, *rrep;
|
||
char fpat = 0, *tpat1, *tpat2;
|
||
char *ws, *wpat, *wrep, tch;
|
||
size_t rreplen;
|
||
|
||
s = ws = wdcopy(sp, ATEMP);
|
||
p = s + (wdscan(sp, ADELIM) - sp);
|
||
d = s + (wdscan(sp, CSUBST) - sp);
|
||
p[-2] = EOS;
|
||
if (ord(p[-1]) == ORD(/*{*/ '}'))
|
||
d = NULL;
|
||
else
|
||
d[-2] = EOS;
|
||
sp += (d ? d : p) - s - 1;
|
||
if (!(stype & STYPE_MASK) &&
|
||
s[0] == CHAR &&
|
||
ctype(s[1], C_SUB2))
|
||
fpat = s[1];
|
||
wpat = s + (fpat ? 2 : 0);
|
||
if (!(wrep = d ? p : NULL)) {
|
||
rrep = null;
|
||
rreplen = 0;
|
||
} else if (!(stype & STYPE_AT)) {
|
||
rrep = evalstr(wrep,
|
||
DOTILDE | DOSCALAR);
|
||
rreplen = strlen(rrep);
|
||
} else {
|
||
rrep = NULL;
|
||
/* shut up GCC */
|
||
rreplen = 0;
|
||
}
|
||
|
||
/* prepare string on which to work */
|
||
strdupx(s, str_val(st->var), ATEMP);
|
||
sbeg = s;
|
||
again_search:
|
||
pat = evalstr(wpat,
|
||
DOTILDE | DOSCALAR | DOPAT);
|
||
/* check for special cases */
|
||
if (!*pat && !fpat) {
|
||
/*
|
||
* empty unanchored
|
||
* pattern => reject
|
||
*/
|
||
goto no_repl;
|
||
}
|
||
if ((stype & STYPE_MASK) &&
|
||
gmatchx(null, pat, false)) {
|
||
/*
|
||
* pattern matches empty
|
||
* string => don't loop
|
||
*/
|
||
stype &= ~STYPE_MASK;
|
||
}
|
||
|
||
/* first see if we have any match at all */
|
||
if (ord(fpat) == ORD('#')) {
|
||
/* anchor at the beginning */
|
||
tpat1 = shf_smprintf("%s%c*", pat, MAGIC);
|
||
tpat2 = tpat1;
|
||
} else if (ord(fpat) == ORD('%')) {
|
||
/* anchor at the end */
|
||
tpat1 = shf_smprintf("%c*%s", MAGIC, pat);
|
||
tpat2 = pat;
|
||
} 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;
|
||
d = strnul(s);
|
||
/* now anchor the beginning of the match */
|
||
if (ord(fpat) != ORD('#'))
|
||
while (sbeg <= d) {
|
||
if (gmatchx(sbeg, tpat2, false))
|
||
break;
|
||
else
|
||
sbeg++;
|
||
}
|
||
/* now anchor the end of the match */
|
||
p = d;
|
||
if (ord(fpat) != ORD('%'))
|
||
while (p >= sbeg) {
|
||
bool gotmatch;
|
||
|
||
c = ord(*p);
|
||
*p = '\0';
|
||
gotmatch = tobool(gmatchx(sbeg, pat, false));
|
||
*p = c;
|
||
if (gotmatch)
|
||
break;
|
||
p--;
|
||
}
|
||
|
||
/* record partial string as match */
|
||
tch = *p;
|
||
*p = '\0';
|
||
record_match(sbeg);
|
||
*p = tch;
|
||
/* get replacement string, if necessary */
|
||
if ((stype & STYPE_AT) &&
|
||
rrep != null) {
|
||
afree(rrep, ATEMP);
|
||
/* might access match! */
|
||
rrep = evalstr(wrep,
|
||
DOTILDE | DOSCALAR);
|
||
rreplen = strlen(rrep);
|
||
}
|
||
|
||
/*
|
||
* string:
|
||
* |--------|---------|-------\0
|
||
* s n1 sbeg n2 p n3 d
|
||
*
|
||
* replacement:
|
||
* |------------|
|
||
* rrep rreplen
|
||
*/
|
||
|
||
/* move strings around and replace */
|
||
{
|
||
size_t n1 = sbeg - s;
|
||
size_t n2 = p - sbeg;
|
||
size_t n3 = d - p;
|
||
/* move part3 to the front, OR… */
|
||
if (rreplen < n2)
|
||
memmove(sbeg + rreplen,
|
||
p, n3 + 1);
|
||
/* … adjust size, move to back */
|
||
if (rreplen > n2) {
|
||
s = aresize(s,
|
||
n1 + rreplen + n3 + 1,
|
||
ATEMP);
|
||
memmove(s + n1 + rreplen,
|
||
s + n1 + n2,
|
||
n3 + 1);
|
||
}
|
||
/* insert replacement */
|
||
if (rreplen)
|
||
memcpy(s + n1, rrep, rreplen);
|
||
/* continue after the place */
|
||
sbeg = s + n1 + rreplen;
|
||
}
|
||
if (stype & STYPE_AT) {
|
||
afree(tpat1, ATEMP);
|
||
afree(pat, ATEMP);
|
||
goto again_search;
|
||
} else if (stype & STYPE_DBL)
|
||
goto again_repl;
|
||
end_repl:
|
||
afree(tpat1, ATEMP);
|
||
x.str = s;
|
||
no_repl:
|
||
afree(pat, ATEMP);
|
||
if (rrep != null)
|
||
afree(rrep, ATEMP);
|
||
afree(ws, ATEMP);
|
||
goto do_CSUBST;
|
||
}
|
||
case ORD('#'):
|
||
case ORD('%'):
|
||
/* ! DOBLANK,DOBRACE */
|
||
f = (f & DONTRUNCOMMAND) |
|
||
DOPAT | DOTILDE |
|
||
DOTEMP | DOSCALAR;
|
||
tilde_ok = 1;
|
||
st->quotew = quote = 0;
|
||
/*
|
||
* Prepend open pattern (so |
|
||
* in a trim will work as
|
||
* expected)
|
||
*/
|
||
if (!Flag(FSH)) {
|
||
*dp++ = MAGIC;
|
||
*dp++ = ORD(0x80 | '@');
|
||
}
|
||
break;
|
||
case ORD('='):
|
||
/*
|
||
* Tilde expansion for string
|
||
* variables in POSIX mode is
|
||
* governed by Austinbug 351.
|
||
* In non-POSIX mode historic
|
||
* ksh behaviour (enable it!)
|
||
* us followed.
|
||
* 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 | DOSCALAR;
|
||
/*
|
||
* These will be done after the
|
||
* value has been assigned.
|
||
*/
|
||
f &= ~(DOBLANK|DOGLOB|DOBRACE);
|
||
tilde_ok = 1;
|
||
break;
|
||
case ORD('?'):
|
||
if (*sp == CSUBST)
|
||
errorf("%s: parameter null or not set",
|
||
st->var->name);
|
||
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 & STYPE_SINGLE) {
|
||
case ORD('#'):
|
||
case ORD('%'):
|
||
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 if (quote) {
|
||
word = IFS_WORD;
|
||
type = XSUB;
|
||
} else {
|
||
if (dp == Xstring(ds, dp))
|
||
word = IFS_IWS;
|
||
type = XNULLSUB;
|
||
}
|
||
if (f & DOBLANK)
|
||
doblank++;
|
||
st = st->prev;
|
||
continue;
|
||
case ORD('='):
|
||
/*
|
||
* 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 ORD('?'):
|
||
dp = Xrestpos(ds, dp, st->base);
|
||
|
||
errorf(Tf_sD_s, st->var->name,
|
||
debunk(dp, dp, strlen(dp) + 1));
|
||
break;
|
||
case ORD('#') | STYPE_AT:
|
||
x.str = shf_smprintf("%08X",
|
||
(unsigned int)hash(str_val(st->var)));
|
||
goto common_CSUBST;
|
||
case ORD('Q') | STYPE_AT: {
|
||
struct shf shf;
|
||
|
||
shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf);
|
||
print_value_quoted(&shf, str_val(st->var));
|
||
x.str = shf_sclose(&shf);
|
||
goto common_CSUBST;
|
||
}
|
||
case ORD('0'):
|
||
case ORD('/') | STYPE_AT:
|
||
case ORD('/'):
|
||
common_CSUBST:
|
||
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 = ord(*sp++) | 0x80U;
|
||
break;
|
||
|
||
case SPAT:
|
||
/* pattern separator (|) */
|
||
make_magic = true;
|
||
c = ORD('|');
|
||
break;
|
||
|
||
case CPAT:
|
||
/* close pattern */
|
||
make_magic = true;
|
||
c = ORD(/*(*/ ')');
|
||
break;
|
||
}
|
||
break;
|
||
|
||
case XNULLSUB:
|
||
/*
|
||
* Special case for "$@" (and "${foo[@]}") - no
|
||
* word is generated if $# is 0 (unless there is
|
||
* other stuff inside the quotes).
|
||
*/
|
||
type = XBASE;
|
||
if (f & DOBLANK) {
|
||
doblank--;
|
||
if (dp == Xstring(ds, dp) && word != IFS_WORD)
|
||
word = IFS_IWS;
|
||
}
|
||
continue;
|
||
|
||
case XSUBPAT:
|
||
case XSUBPATMID:
|
||
XSUBPAT_beg:
|
||
switch ((c = ord(*x.str++))) {
|
||
case 0:
|
||
goto XSUB_end;
|
||
case ORD('\\'):
|
||
if ((c = ord(*x.str)) == 0)
|
||
/* keep backslash at EOS */
|
||
c = ORD('\\');
|
||
else
|
||
++x.str;
|
||
quote |= 2;
|
||
break;
|
||
/* ctype(c, C_PATMO) */
|
||
case ORD('!'):
|
||
case ORD('*'):
|
||
case ORD('+'):
|
||
case ORD('?'):
|
||
case ORD('@'):
|
||
if (ord(*x.str) == ORD('('/*)*/)) {
|
||
++x.str;
|
||
c |= 0x80U;
|
||
make_magic = true;
|
||
}
|
||
break;
|
||
case ORD('('):
|
||
c = ORD(' ') | 0x80U;
|
||
/* FALLTHROUGH */
|
||
case ORD('|'):
|
||
case ORD(')'):
|
||
make_magic = true;
|
||
break;
|
||
}
|
||
break;
|
||
|
||
case XSUB:
|
||
if (!quote && (f & DODBMAGIC)) {
|
||
const char *cs = x.str;
|
||
int level = 0;
|
||
|
||
while ((c = *cs++))
|
||
switch (c) {
|
||
case '\\':
|
||
if ((c = *cs))
|
||
++cs;
|
||
break;
|
||
case ORD('('):
|
||
++level;
|
||
break;
|
||
case ORD(')'):
|
||
--level;
|
||
break;
|
||
}
|
||
/* balanced parentheses? */
|
||
if (!level) {
|
||
type = XSUBPAT;
|
||
goto XSUBPAT_beg;
|
||
}
|
||
}
|
||
/* FALLTHROUGH */
|
||
case XSUBMID:
|
||
if ((c = ord(*x.str++)) == 0) {
|
||
XSUB_end:
|
||
type = XBASE;
|
||
if (f & DOBLANK)
|
||
doblank--;
|
||
continue;
|
||
}
|
||
break;
|
||
|
||
case XARGSEP:
|
||
type = XARG;
|
||
quote = 1;
|
||
/* FALLTHROUGH */
|
||
case XARG:
|
||
if ((c = ord(*x.str++)) == '\0') {
|
||
/*
|
||
* force null words to be created so
|
||
* set -- "" 2 ""; echo "$@" 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 = ord(ifs0);
|
||
if ((f & DOHEREDOC)) {
|
||
/* pseudo-field-split reliably */
|
||
if (c == 0)
|
||
c = ORD(' ');
|
||
break;
|
||
}
|
||
if ((f & DOSCALAR)) {
|
||
/* do not field-split */
|
||
if (x.split) {
|
||
c = ORD(' ');
|
||
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 = ORD(' ');
|
||
/* 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 = ORD('\n');
|
||
--newlines;
|
||
} else {
|
||
while ((c = shf_getc(x.u.shf)) == 0 ||
|
||
cinttype(c, C_NL)) {
|
||
#ifdef MKSH_WITH_TEXTMODE
|
||
if (c == ORD('\r')) {
|
||
c = shf_getc(x.u.shf);
|
||
switch (c) {
|
||
case ORD('\n'):
|
||
break;
|
||
default:
|
||
shf_ungetc(c, x.u.shf);
|
||
/* FALLTHROUGH */
|
||
case -1:
|
||
c = ORD('\r');
|
||
break;
|
||
}
|
||
}
|
||
#endif
|
||
if (c == ORD('\n'))
|
||
/* save newlines */
|
||
newlines++;
|
||
}
|
||
if (newlines && c != -1) {
|
||
shf_ungetc(c, x.u.shf);
|
||
c = ORD('\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) || (word == IFS_QUOTE) || (c &&
|
||
(word == IFS_IWS || word == IFS_NWS) &&
|
||
!ctype(c, C_IFSWS))) {
|
||
emit_word:
|
||
if (f & DOHERESTR)
|
||
*dp++ = '\n';
|
||
*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 (isXSUB(type) && ctype(c, C_IFS) &&
|
||
!ctype(c, C_IFSWS) && Xlength(ds, dp) == 0) {
|
||
*(cp = alloc(1, ATEMP)) = '\0';
|
||
XPput(*wp, cp);
|
||
++type;
|
||
}
|
||
if (word != IFS_NWS)
|
||
word = ctype(c, C_IFSWS) ? IFS_WS : IFS_NWS;
|
||
} else {
|
||
if (isXSUB(type))
|
||
++type;
|
||
|
||
/* age tilde_ok info - ~ code tests second bit */
|
||
tilde_ok <<= 1;
|
||
/* mark any special second pass chars */
|
||
if (!quote)
|
||
switch (ord(c)) {
|
||
case ORD('['):
|
||
case ORD('!'):
|
||
case ORD('-'):
|
||
case ORD(']'):
|
||
/*
|
||
* For character classes - doesn't hurt
|
||
* to have magic !,-,]s outside of
|
||
* [...] expressions.
|
||
*/
|
||
if (f & (DOPAT | DOGLOB)) {
|
||
fdo |= DOMAGIC;
|
||
if ((unsigned int)c == ORD('['))
|
||
fdo |= f & DOGLOB;
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case ORD('*'):
|
||
case ORD('?'):
|
||
if (f & (DOPAT | DOGLOB)) {
|
||
fdo |= DOMAGIC | (f & DOGLOB);
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case ORD('{'):
|
||
case ORD('}'):
|
||
case ORD(','):
|
||
if ((f & DOBRACE) &&
|
||
(ord(c) == ORD('{' /*}*/) ||
|
||
(fdo & DOBRACE))) {
|
||
fdo |= DOBRACE|DOMAGIC;
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case ORD('='):
|
||
/* Note first unquoted = for ~ */
|
||
if (!(f & DOTEMP) && (!Flag(FPOSIX) ||
|
||
(f & DOASNTILDE)) && !saw_eq) {
|
||
saw_eq = true;
|
||
tilde_ok = 1;
|
||
}
|
||
break;
|
||
case ORD(':'):
|
||
/* : */
|
||
/* Note unquoted : for ~ */
|
||
if (!(f & DOTEMP) && (f & DOASNTILDE))
|
||
tilde_ok = 1;
|
||
break;
|
||
case ORD('~'):
|
||
/*
|
||
* 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;
|
||
}
|
||
}
|
||
}
|
||
|
||
static bool
|
||
hasnonempty(const char **strv)
|
||
{
|
||
size_t i = 0;
|
||
|
||
while (strv[i])
|
||
if (*strv[i++])
|
||
return (true);
|
||
return (false);
|
||
}
|
||
|
||
/*
|
||
* Prepare to generate the string returned by ${} substitution.
|
||
*/
|
||
static int
|
||
varsub(Expand *xp, const char *sp, const char *word,
|
||
/* becomes qualifier type */
|
||
unsigned int *stypep,
|
||
/* becomes qualifier type len (=, :=, etc.) valid iff *stypep != 0 */
|
||
int *slenp)
|
||
{
|
||
unsigned int c;
|
||
int state; /* next state: XBASE, XARG, XSUB, XNULLSUB */
|
||
unsigned int stype; /* substitution type */
|
||
int slen = 0;
|
||
const char *p;
|
||
struct tbl *vp;
|
||
bool zero_ok = false;
|
||
int sc;
|
||
XPtrV wv;
|
||
|
||
if ((stype = ord(sp[0])) == '\0')
|
||
/* Bad variable name */
|
||
return (-1);
|
||
|
||
xp->var = NULL;
|
||
|
||
/* entirety of named array? */
|
||
if ((p = cstrchr(sp, '[')) && (sc = ord(p[1])) &&
|
||
ord(p[2]) == ORD(']'))
|
||
/* keep p (for ${!foo[1]} below)! */
|
||
switch (sc) {
|
||
case ORD('*'):
|
||
sc = 3;
|
||
break;
|
||
case ORD('@'):
|
||
sc = 7;
|
||
break;
|
||
default:
|
||
/* bit2 = @, bit1 = array, bit0 = enabled */
|
||
sc = 0;
|
||
}
|
||
else
|
||
/* $* and $@ checked below */
|
||
sc = 0;
|
||
|
||
/*-
|
||
* ${%var}, string width (-U: screen columns, +U: octets)
|
||
* ${#var}, string length (-U: characters, +U: octets) or array size
|
||
* ${!var}, variable name
|
||
* ${*…} -> set flag for argv
|
||
* ${@…} -> set flag for argv
|
||
*/
|
||
if (ctype(stype, C_SUB2 | CiVAR1)) {
|
||
switch (stype) {
|
||
case ORD('*'):
|
||
if (!sc)
|
||
sc = 1;
|
||
goto nopfx;
|
||
case ORD('@'):
|
||
if (!sc)
|
||
sc = 5;
|
||
goto nopfx;
|
||
}
|
||
/* varname required */
|
||
if ((c = ord(sp[1])) == '\0') {
|
||
if (stype == ORD('%'))
|
||
/* $% */
|
||
return (-1);
|
||
/* $# or $! */
|
||
goto nopfx;
|
||
}
|
||
/* can’t have any modifiers for ${#…} or ${%…} or ${!…} */
|
||
if (*word != CSUBST)
|
||
return (-1);
|
||
/* check for argv past prefix */
|
||
if (!sc) switch (c) {
|
||
case ORD('*'):
|
||
sc = 1;
|
||
break;
|
||
case ORD('@'):
|
||
sc = 5;
|
||
break;
|
||
}
|
||
/* skip past prefix */
|
||
++sp;
|
||
/* determine result */
|
||
switch (stype) {
|
||
case ORD('!'):
|
||
if (sc & 2) {
|
||
stype = 0;
|
||
XPinit(wv, 32);
|
||
vp = global(arrayname(sp));
|
||
do {
|
||
if (vp->flag & ISSET)
|
||
XPput(wv, shf_smprintf(Tf_lu,
|
||
arrayindex(vp)));
|
||
} while ((vp = vp->u.array));
|
||
goto arraynames;
|
||
}
|
||
xp->var = global(sp);
|
||
/* use saved p from above */
|
||
xp->str = p ? shf_smprintf("%s[%lu]", xp->var->name,
|
||
arrayindex(xp->var)) : xp->var->name;
|
||
break;
|
||
#ifdef DEBUG
|
||
default:
|
||
internal_errorf("stype mismatch");
|
||
/* NOTREACHED */
|
||
#endif
|
||
case ORD('%'):
|
||
/* cannot do this on an array */
|
||
if (sc)
|
||
return (-1);
|
||
p = str_val(global(sp));
|
||
zero_ok = p != null;
|
||
/* partial utf_mbswidth reimplementation */
|
||
sc = 0;
|
||
while (*p) {
|
||
if (!UTFMODE ||
|
||
(wv.len = utf_mbtowc(&c, p)) == (size_t)-1)
|
||
/* not UTFMODE or not UTF-8 */
|
||
c = rtt2asc(*p++);
|
||
else
|
||
/* UTFMODE and UTF-8 */
|
||
p += wv.len;
|
||
/* c == char or wchar at p++ */
|
||
if ((slen = utf_wcwidth(c)) == -1) {
|
||
/* 646, 8859-1, 10646 C0/C1 */
|
||
sc = -1;
|
||
break;
|
||
}
|
||
sc += slen;
|
||
}
|
||
if (0)
|
||
/* FALLTHROUGH */
|
||
case ORD('#'):
|
||
switch (sc & 3) {
|
||
case 3:
|
||
vp = global(arrayname(sp));
|
||
if (vp->flag & (ISSET|ARRAY))
|
||
zero_ok = true;
|
||
sc = 0;
|
||
do {
|
||
if (vp->flag & ISSET)
|
||
sc++;
|
||
} while ((vp = vp->u.array));
|
||
break;
|
||
case 1:
|
||
sc = e->loc->argc;
|
||
break;
|
||
default:
|
||
p = str_val(global(sp));
|
||
zero_ok = p != null;
|
||
sc = utflen(p);
|
||
break;
|
||
}
|
||
/* ${%var} also here */
|
||
if (Flag(FNOUNSET) && sc == 0 && !zero_ok)
|
||
errorf(Tf_parm, sp);
|
||
xp->str = shf_smprintf(Tf_d, sc);
|
||
break;
|
||
}
|
||
/* unqualified variable/string substitution */
|
||
*stypep = 0;
|
||
return (XSUB);
|
||
}
|
||
nopfx:
|
||
|
||
/* check for qualifiers in word part */
|
||
stype = 0;
|
||
/*slen = 0;*/
|
||
c = word[/*slen +*/ 0] == CHAR ? ord(word[/*slen +*/ 1]) : 0;
|
||
if (c == ORD(':')) {
|
||
slen += 2;
|
||
stype = STYPE_DBL;
|
||
c = word[slen + 0] == CHAR ? ord(word[slen + 1]) : 0;
|
||
}
|
||
if (!stype && c == ORD('/')) {
|
||
slen += 2;
|
||
stype = c;
|
||
if (word[slen] == ADELIM &&
|
||
ord(word[slen + 1]) == c) {
|
||
slen += 2;
|
||
stype |= STYPE_DBL;
|
||
}
|
||
} else if (stype == STYPE_DBL && (c == ORD(' ') || c == ORD('0'))) {
|
||
stype |= ORD('0');
|
||
} else if (ctype(c, C_SUB1)) {
|
||
slen += 2;
|
||
stype |= c;
|
||
} else if (ctype(c, C_SUB2)) {
|
||
/* Note: ksh88 allows :%, :%%, etc */
|
||
slen += 2;
|
||
stype = c;
|
||
if (word[slen + 0] == CHAR && ord(word[slen + 1]) == c) {
|
||
stype |= STYPE_DBL;
|
||
slen += 2;
|
||
}
|
||
} else if (c == ORD('@')) {
|
||
/* @x where x is command char */
|
||
switch (c = ord(word[slen + 2]) == CHAR ?
|
||
ord(word[slen + 3]) : 0) {
|
||
case ORD('#'):
|
||
case ORD('/'):
|
||
case ORD('Q'):
|
||
break;
|
||
default:
|
||
return (-1);
|
||
}
|
||
stype |= STYPE_AT | c;
|
||
slen += 4;
|
||
} else if (stype)
|
||
/* : is not ok */
|
||
return (-1);
|
||
if (!stype && *word != CSUBST)
|
||
return (-1);
|
||
|
||
if (!sc) {
|
||
xp->var = global(sp);
|
||
xp->str = str_val(xp->var);
|
||
/* can't assign things like $! or $1 */
|
||
if ((stype & STYPE_SINGLE) == ORD('=') &&
|
||
!*xp->str && ctype(*sp, C_VAR1 | C_DIGIT))
|
||
return (-1);
|
||
state = XSUB;
|
||
} else {
|
||
/* can’t assign/trim a vector (yet) */
|
||
switch (stype & STYPE_SINGLE) {
|
||
case ORD('-'):
|
||
case ORD('+'):
|
||
/* allowed ops */
|
||
case 0:
|
||
/* or no ops */
|
||
break;
|
||
/* case ORD('='):
|
||
case ORD('?'):
|
||
case ORD('#'):
|
||
case ORD('%'):
|
||
case ORD('/'):
|
||
case ORD('/') | STYPE_AT:
|
||
case ORD('0'):
|
||
case ORD('#') | STYPE_AT:
|
||
case ORD('Q') | STYPE_AT:
|
||
*/ default:
|
||
return (-1);
|
||
}
|
||
/* do what we can */
|
||
if (sc & 2) {
|
||
XPinit(wv, 32);
|
||
vp = global(arrayname(sp));
|
||
do {
|
||
if (vp->flag & ISSET)
|
||
XPput(wv, str_val(vp));
|
||
} while ((vp = vp->u.array));
|
||
arraynames:
|
||
if ((c = (XPsize(wv) == 0)))
|
||
XPfree(wv);
|
||
else {
|
||
XPput(wv, NULL);
|
||
xp->u.strv = (const char **)XPptrv(wv);
|
||
}
|
||
} else {
|
||
if ((c = (e->loc->argc == 0)))
|
||
xp->var = global(sp);
|
||
else
|
||
xp->u.strv = (const char **)e->loc->argv + 1;
|
||
/* POSIX 2009? */
|
||
zero_ok = true;
|
||
}
|
||
/* have we got any elements? */
|
||
if (c) {
|
||
/* no */
|
||
xp->str = null;
|
||
state = sc & 4 ? XNULLSUB : XSUB;
|
||
} else {
|
||
/* yes → load first */
|
||
xp->str = *xp->u.strv++;
|
||
/* $@ or ${foo[@]} */
|
||
xp->split = tobool(sc & 4);
|
||
state = XARG;
|
||
}
|
||
}
|
||
|
||
c = stype & STYPE_CHAR;
|
||
/* test the compiler's code generator */
|
||
if ((!(stype & STYPE_AT) && (ctype(c, C_SUB2) ||
|
||
(((stype & STYPE_DBL) ? *xp->str == '\0' : xp->str == null) &&
|
||
(state != XARG || (ifs0 || xp->split ?
|
||
(xp->u.strv[0] == NULL) : !hasnonempty(xp->u.strv))) ?
|
||
ctype(c, C_EQUAL | C_MINUS | C_QUEST) : c == ORD('+')))) ||
|
||
stype == (ORD('0') | STYPE_DBL) ||
|
||
stype == (ORD('#') | STYPE_AT) ||
|
||
stype == (ORD('Q') | STYPE_AT) ||
|
||
(stype & STYPE_CHAR) == ORD('/'))
|
||
/* expand word instead of variable value */
|
||
state = XBASE;
|
||
if (Flag(FNOUNSET) && xp->str == null && !zero_ok &&
|
||
(ctype(c, C_SUB2) || (state != XBASE && c != ORD('+'))))
|
||
errorf(Tf_parm, sp);
|
||
*stypep = stype;
|
||
*slenp = slen;
|
||
return (state);
|
||
}
|
||
|
||
/*
|
||
* Run the command in $(...) and read its output.
|
||
*/
|
||
static int
|
||
comsub(Expand *xp, const char *cp, int fn)
|
||
{
|
||
Source *s, *sold;
|
||
struct op *t;
|
||
struct shf *shf;
|
||
bool doalias = false;
|
||
uint8_t old_utfmode = UTFMODE;
|
||
|
||
switch (fn) {
|
||
case COMASUB:
|
||
fn = COMSUB;
|
||
if (0)
|
||
/* FALLTHROUGH */
|
||
case FUNASUB:
|
||
fn = FUNSUB;
|
||
doalias = true;
|
||
}
|
||
|
||
s = pushs(SSTRING, ATEMP);
|
||
s->start = s->str = cp;
|
||
sold = source;
|
||
t = compile(s, true, doalias);
|
||
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) {
|
||
/* $(<file) */
|
||
struct ioword *io = *t->ioact;
|
||
char *name;
|
||
|
||
switch (io->ioflag & IOTYPE) {
|
||
case IOREAD:
|
||
shf = shf_open(name = evalstr(io->ioname, DOTILDE),
|
||
O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
|
||
if (shf == NULL)
|
||
warningf(!Flag(FTALKING), Tf_sD_s_sD_s,
|
||
name, Tcant_open, "$(<...) input",
|
||
cstrerror(errno));
|
||
break;
|
||
case IOHERE:
|
||
if (!herein(io, &name)) {
|
||
xp->str = name;
|
||
/* as $(…) requires, trim trailing newlines */
|
||
name = strnul(name);
|
||
while (name > xp->str && name[-1] == '\n')
|
||
--name;
|
||
*name = '\0';
|
||
return (XSUB);
|
||
}
|
||
shf = NULL;
|
||
break;
|
||
default:
|
||
errorf(Tf_sD_s, T_funny_command,
|
||
snptreef(NULL, 32, Tft_R, io));
|
||
}
|
||
} 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(Tf_temp,
|
||
Tcreate, 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 & (STYPE_CHAR | STYPE_DBL)) {
|
||
case ORD('#'):
|
||
/* shortest match at beginning */
|
||
for (p = str; p <= end; p += utf_ptradj(p)) {
|
||
c = *p; *p = '\0';
|
||
if (gmatchx(str, pat, false)) {
|
||
record_match(str);
|
||
*p = c;
|
||
return (p);
|
||
}
|
||
*p = c;
|
||
}
|
||
break;
|
||
case ORD('#') | STYPE_DBL:
|
||
/* longest match at beginning */
|
||
for (p = end; p >= str; p--) {
|
||
c = *p; *p = '\0';
|
||
if (gmatchx(str, pat, false)) {
|
||
record_match(str);
|
||
*p = c;
|
||
return (p);
|
||
}
|
||
*p = c;
|
||
}
|
||
break;
|
||
case ORD('%'):
|
||
/* 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) && ((rtt2asc(*p) & 0xC0) == 0x80))
|
||
;
|
||
if ((p < str) || (p + utf_ptradj(p) != op))
|
||
p = op - 1;
|
||
} else
|
||
--p;
|
||
}
|
||
break;
|
||
case ORD('%') | STYPE_DBL:
|
||
/* longest match at end */
|
||
for (p = str; p <= end; p++)
|
||
if (gmatchx(p, pat, false)) {
|
||
trimsub_match:
|
||
record_match(p);
|
||
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 *), ascpstrcmp);
|
||
}
|
||
|
||
#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) &&
|
||
mksh_cdirsep(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) && !mksh_cdirsep(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 (mksh_cdirsep(*sp)) {
|
||
Xcheck(*xs, xp);
|
||
*xp++ = *sp++;
|
||
}
|
||
np = mksh_sdirsep(sp);
|
||
if (np != NULL) {
|
||
se = np;
|
||
/* don't assume '/', can be multiple kinds */
|
||
odirsep = *np;
|
||
*np++ = '\0';
|
||
} else {
|
||
odirsep = '\0'; /* keep gcc quiet */
|
||
se = strnul(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)) {
|
||
XcheckN(*xs, xp, se - sp + 1);
|
||
debunk(xp, sp, Xnleft(*xs, xp));
|
||
xp = strnul(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) : Tdot);
|
||
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) ||
|
||
!ctype(*s & 0x7F, C_PATMO | C_SPC))
|
||
*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 && /* not cdirsep */ 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;
|
||
#ifndef MKSH_NOPWNAM
|
||
bool do_simplify = true;
|
||
#endif
|
||
|
||
if (cp[0] == '\0')
|
||
dp = str_val(global("HOME"));
|
||
else if (cp[0] == '+' && cp[1] == '\0')
|
||
dp = str_val(global(TPWD));
|
||
else if (ksh_isdash(cp))
|
||
dp = str_val(global(TOLDPWD));
|
||
#ifndef MKSH_NOPWNAM
|
||
else {
|
||
dp = homedir(cp);
|
||
do_simplify = false;
|
||
}
|
||
#endif
|
||
|
||
/* if parameters aren't set, don't expand ~ */
|
||
if (dp == NULL || dp == null)
|
||
return (NULL);
|
||
|
||
/* simplify parameters as if cwd upon entry */
|
||
#ifndef MKSH_NOPWNAM
|
||
if (do_simplify)
|
||
#endif
|
||
{
|
||
strdupx(dp, dp, ATEMP);
|
||
simplify_path(dp);
|
||
}
|
||
return (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)) && ord(p[1]) != ORD('{' /*}*/))
|
||
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 (ord(*p) == ORD('{' /*}*/))
|
||
++count;
|
||
else if (ord(*p) == ORD(/*{*/ '}'))
|
||
--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 (ord(*++p) == ORD('{' /*}*/))
|
||
++count;
|
||
else if ((ord(*p) == ORD(/*{*/ '}') && --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(TREPLY, false);
|
||
if (!kshsetjmp(e->jbuf))
|
||
execute(t, XXCOM | XERROK, NULL);
|
||
if (vp)
|
||
strdupx(cp, str_val(vp), ap);
|
||
quitenv(NULL);
|
||
|
||
return (cp);
|
||
}
|