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freebsd-dev/bin/sh/expand.c

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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1997-2005
* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
/*
* Routines to expand arguments to commands. We have to deal with
* backquotes, shell variables, and file metacharacters.
*/
#include "shell.h"
#include "main.h"
#include "nodes.h"
#include "eval.h"
#include "expand.h"
#include "syntax.h"
#include "parser.h"
#include "jobs.h"
#include "options.h"
#include "var.h"
#include "input.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "mystring.h"
#include "arith.h"
#include "show.h"
#include "builtins.h"
/*
* Structure specifying which parts of the string should be searched
* for IFS characters.
*/
struct ifsregion {
struct ifsregion *next; /* next region in list */
int begoff; /* offset of start of region */
int endoff; /* offset of end of region */
int inquotes; /* search for nul bytes only */
};
static char *expdest; /* output of current string */
static struct nodelist *argbackq; /* list of back quote expressions */
static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
static struct ifsregion *ifslastp; /* last struct in list */
static struct arglist exparg; /* holds expanded arg list */
static void argstr(char *, int);
static char *exptilde(char *, int);
static void expbackq(union node *, int, int);
static int subevalvar(char *, char *, int, int, int, int, int);
static char *evalvar(char *, int);
static int varisset(char *, int);
static void varvalue(char *, int, int, int);
static void recordregion(int, int, int);
static void removerecordregions(int);
static void ifsbreakup(char *, struct arglist *);
static void expandmeta(struct strlist *, int);
static void expmeta(char *, char *);
static void addfname(char *);
static struct strlist *expsort(struct strlist *);
static struct strlist *msort(struct strlist *, int);
static int patmatch(const char *, const char *, int);
static char *cvtnum(int, char *);
static int collate_range_cmp(wchar_t, wchar_t);
static int
collate_range_cmp(wchar_t c1, wchar_t c2)
{
static wchar_t s1[2], s2[2];
s1[0] = c1;
s2[0] = c2;
return (wcscoll(s1, s2));
}
static char *
stputs_quotes(const char *data, const char *syntax, char *p)
{
while (*data) {
CHECKSTRSPACE(2, p);
if (syntax[(int)*data] == CCTL)
USTPUTC(CTLESC, p);
USTPUTC(*data++, p);
}
return (p);
}
#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
/*
* Perform expansions on an argument, placing the resulting list of arguments
* in arglist. Parameter expansion, command substitution and arithmetic
* expansion are always performed; additional expansions can be requested
* via flag (EXP_*).
* The result is left in the stack string.
* When arglist is NULL, perform here document expansion.
*
* Caution: this function uses global state and is not reentrant.
* However, a new invocation after an interrupted invocation is safe
* and will reset the global state for the new call.
*/
void
expandarg(union node *arg, struct arglist *arglist, int flag)
{
struct strlist *sp;
char *p;
argbackq = arg->narg.backquote;
STARTSTACKSTR(expdest);
ifsfirst.next = NULL;
ifslastp = NULL;
argstr(arg->narg.text, flag);
if (arglist == NULL) {
STACKSTRNUL(expdest);
return; /* here document expanded */
}
STPUTC('\0', expdest);
p = grabstackstr(expdest);
exparg.lastp = &exparg.list;
/*
* TODO - EXP_REDIR
*/
if (flag & EXP_FULL) {
ifsbreakup(p, &exparg);
*exparg.lastp = NULL;
exparg.lastp = &exparg.list;
expandmeta(exparg.list, flag);
} else {
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
rmescapes(p);
sp = (struct strlist *)stalloc(sizeof (struct strlist));
sp->text = p;
*exparg.lastp = sp;
exparg.lastp = &sp->next;
}
while (ifsfirst.next != NULL) {
struct ifsregion *ifsp;
INTOFF;
ifsp = ifsfirst.next->next;
ckfree(ifsfirst.next);
ifsfirst.next = ifsp;
INTON;
}
*exparg.lastp = NULL;
if (exparg.list) {
*arglist->lastp = exparg.list;
arglist->lastp = exparg.lastp;
}
}
/*
* Perform parameter expansion, command substitution and arithmetic
* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
* Processing ends at a CTLENDVAR character as well as '\0'.
* This is used to expand word in ${var+word} etc.
* If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC
* characters to allow for further processing.
* If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
*/
static void
argstr(char *p, int flag)
{
char c;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
int firsteq = 1;
int split_lit;
int lit_quoted;
split_lit = flag & EXP_SPLIT_LIT;
lit_quoted = flag & EXP_LIT_QUOTED;
flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
CHECKSTRSPACE(2, expdest);
switch (c = *p++) {
case '\0':
case CTLENDVAR:
goto breakloop;
case CTLQUOTEMARK:
lit_quoted = 1;
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_FULL) != 0)
USTPUTC(c, expdest);
break;
case CTLQUOTEEND:
lit_quoted = 0;
break;
case CTLESC:
if (quotes)
USTPUTC(c, expdest);
c = *p++;
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() -
(quotes ? 2 : 1),
expdest - stackblock(), 0);
break;
case CTLVAR:
p = evalvar(p, flag);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c & CTLQUOTE, flag);
argbackq = argbackq->next;
break;
case CTLENDARI:
expari(flag);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() - 1,
expdest - stackblock(), 0);
if (flag & EXP_VARTILDE && *p == '~' &&
(c != '=' || firsteq)) {
if (c == '=')
firsteq = 0;
p = exptilde(p, flag);
}
break;
default:
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() - 1,
expdest - stackblock(), 0);
}
}
breakloop:;
}
/*
* Perform tilde expansion, placing the result in the stack string and
* returning the next position in the input string to process.
*/
static char *
exptilde(char *p, int flag)
{
char c, *startp = p;
struct passwd *pw;
char *home;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
while ((c = *p) != '\0') {
switch(c) {
case CTLESC: /* This means CTL* are always considered quoted. */
case CTLVAR:
case CTLBACKQ:
case CTLBACKQ | CTLQUOTE:
case CTLARI:
case CTLENDARI:
case CTLQUOTEMARK:
return (startp);
case ':':
if (flag & EXP_VARTILDE)
goto done;
break;
case '/':
case CTLENDVAR:
goto done;
}
p++;
}
done:
*p = '\0';
if (*(startp+1) == '\0') {
if ((home = lookupvar("HOME")) == NULL)
goto lose;
} else {
if ((pw = getpwnam(startp+1)) == NULL)
goto lose;
home = pw->pw_dir;
}
if (*home == '\0')
goto lose;
*p = c;
if (quotes)
STPUTS_QUOTES(home, SQSYNTAX, expdest);
else
STPUTS(home, expdest);
return (p);
lose:
*p = c;
return (startp);
}
static void
removerecordregions(int endoff)
{
if (ifslastp == NULL)
return;
if (ifsfirst.endoff > endoff) {
while (ifsfirst.next != NULL) {
struct ifsregion *ifsp;
INTOFF;
ifsp = ifsfirst.next->next;
ckfree(ifsfirst.next);
ifsfirst.next = ifsp;
INTON;
}
if (ifsfirst.begoff > endoff)
ifslastp = NULL;
else {
ifslastp = &ifsfirst;
ifsfirst.endoff = endoff;
}
return;
}
ifslastp = &ifsfirst;
while (ifslastp->next && ifslastp->next->begoff < endoff)
ifslastp=ifslastp->next;
while (ifslastp->next != NULL) {
struct ifsregion *ifsp;
INTOFF;
ifsp = ifslastp->next->next;
ckfree(ifslastp->next);
ifslastp->next = ifsp;
INTON;
}
if (ifslastp->endoff > endoff)
ifslastp->endoff = endoff;
}
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
*/
void
expari(int flag)
{
char *p, *q, *start;
arith_t result;
int begoff;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
int quoted;
/*
* This routine is slightly over-complicated for
* efficiency. First we make sure there is
* enough space for the result, which may be bigger
* than the expression. Next we
* scan backwards looking for the start of arithmetic. If the
* next previous character is a CTLESC character, then we
* have to rescan starting from the beginning since CTLESC
* characters have to be processed left to right.
*/
CHECKSTRSPACE(DIGITS(result) - 2, expdest);
USTPUTC('\0', expdest);
start = stackblock();
p = expdest - 2;
while (p >= start && *p != CTLARI)
--p;
if (p < start || *p != CTLARI)
error("missing CTLARI (shouldn't happen)");
if (p > start && *(p - 1) == CTLESC)
for (p = start; *p != CTLARI; p++)
if (*p == CTLESC)
p++;
if (p[1] == '"')
quoted=1;
else
quoted=0;
begoff = p - start;
removerecordregions(begoff);
if (quotes)
rmescapes(p+2);
q = grabstackstr(expdest);
result = arith(p+2);
ungrabstackstr(q, expdest);
fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result);
while (*p++)
;
if (quoted == 0)
recordregion(begoff, p - 1 - start, 0);
result = expdest - p + 1;
STADJUST(-result, expdest);
}
/*
* Perform command substitution.
*/
static void
expbackq(union node *cmd, int quoted, int flag)
{
struct backcmd in;
int i;
char buf[128];
char *p;
char *dest = expdest;
struct ifsregion saveifs, *savelastp;
struct nodelist *saveargbackq;
char lastc;
int startloc = dest - stackblock();
char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
size_t nnl;
INTOFF;
saveifs = ifsfirst;
savelastp = ifslastp;
saveargbackq = argbackq;
p = grabstackstr(dest);
evalbackcmd(cmd, &in);
ungrabstackstr(p, dest);
ifsfirst = saveifs;
ifslastp = savelastp;
argbackq = saveargbackq;
p = in.buf;
lastc = '\0';
nnl = 0;
/* Don't copy trailing newlines */
for (;;) {
if (--in.nleft < 0) {
if (in.fd < 0)
break;
while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
TRACE(("expbackq: read returns %d\n", i));
if (i <= 0)
break;
p = buf;
in.nleft = i - 1;
}
lastc = *p++;
if (lastc != '\0') {
if (lastc == '\n') {
nnl++;
} else {
CHECKSTRSPACE(nnl + 2, dest);
while (nnl > 0) {
nnl--;
USTPUTC('\n', dest);
}
if (quotes && syntax[(int)lastc] == CCTL)
USTPUTC(CTLESC, dest);
USTPUTC(lastc, dest);
}
}
}
if (in.fd >= 0)
close(in.fd);
if (in.buf)
ckfree(in.buf);
if (in.jp)
exitstatus = waitforjob(in.jp, (int *)NULL);
if (quoted == 0)
recordregion(startloc, dest - stackblock(), 0);
TRACE(("expbackq: size=%td: \"%.*s\"\n",
((dest - stackblock()) - startloc),
(int)((dest - stackblock()) - startloc),
stackblock() + startloc));
expdest = dest;
INTON;
}
static int
subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
int varflags, int quotes)
{
char *startp;
char *loc = NULL;
char *q;
int c = 0;
struct nodelist *saveargbackq = argbackq;
int amount;
argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
EXP_CASE : 0) | EXP_TILDE);
STACKSTRNUL(expdest);
argbackq = saveargbackq;
startp = stackblock() + startloc;
if (str == NULL)
str = stackblock() + strloc;
switch (subtype) {
case VSASSIGN:
setvar(str, startp, 0);
amount = startp - expdest;
STADJUST(amount, expdest);
varflags &= ~VSNUL;
return 1;
case VSQUESTION:
if (*p != CTLENDVAR) {
outfmt(out2, "%s\n", startp);
error((char *)NULL);
}
error("%.*s: parameter %snot set", (int)(p - str - 1),
str, (varflags & VSNUL) ? "null or "
: nullstr);
return 0;
case VSTRIMLEFT:
for (loc = startp; loc < str; loc++) {
c = *loc;
*loc = '\0';
if (patmatch(str, startp, quotes)) {
*loc = c;
goto recordleft;
}
*loc = c;
if (quotes && *loc == CTLESC)
loc++;
}
return 0;
case VSTRIMLEFTMAX:
for (loc = str - 1; loc >= startp;) {
c = *loc;
*loc = '\0';
if (patmatch(str, startp, quotes)) {
*loc = c;
goto recordleft;
}
*loc = c;
loc--;
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
for (q = startp; q < loc; q++)
if (*q == CTLESC)
q++;
if (q > loc)
loc--;
}
}
return 0;
case VSTRIMRIGHT:
for (loc = str - 1; loc >= startp;) {
if (patmatch(str, loc, quotes)) {
amount = loc - expdest;
STADJUST(amount, expdest);
return 1;
}
loc--;
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
for (q = startp; q < loc; q++)
if (*q == CTLESC)
q++;
if (q > loc)
loc--;
}
}
return 0;
case VSTRIMRIGHTMAX:
for (loc = startp; loc < str - 1; loc++) {
if (patmatch(str, loc, quotes)) {
amount = loc - expdest;
STADJUST(amount, expdest);
return 1;
}
if (quotes && *loc == CTLESC)
loc++;
}
return 0;
default:
abort();
}
recordleft:
amount = ((str - 1) - (loc - startp)) - expdest;
STADJUST(amount, expdest);
while (loc != str - 1)
*startp++ = *loc++;
return 1;
}
/*
* Expand a variable, and return a pointer to the next character in the
* input string.
*/
static char *
evalvar(char *p, int flag)
{
int subtype;
int varflags;
char *var;
char *val;
int patloc;
int c;
int set;
int special;
int startloc;
int varlen;
int varlenb;
int easy;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
varflags = (unsigned char)*p++;
subtype = varflags & VSTYPE;
var = p;
special = 0;
if (! is_name(*p))
special = 1;
p = strchr(p, '=') + 1;
again: /* jump here after setting a variable with ${var=text} */
if (varflags & VSLINENO) {
set = 1;
special = 0;
val = var;
p[-1] = '\0'; /* temporarily overwrite '=' to have \0
terminated string */
} else if (special) {
set = varisset(var, varflags & VSNUL);
val = NULL;
} else {
val = bltinlookup(var, 1);
if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
val = NULL;
set = 0;
} else
set = 1;
}
varlen = 0;
startloc = expdest - stackblock();
if (!set && uflag && *var != '@' && *var != '*') {
switch (subtype) {
case VSNORMAL:
case VSTRIMLEFT:
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
case VSLENGTH:
error("%.*s: parameter not set", (int)(p - var - 1),
var);
}
}
if (set && subtype != VSPLUS) {
/* insert the value of the variable */
if (special) {
varvalue(var, varflags & VSQUOTE, subtype, flag);
if (subtype == VSLENGTH) {
varlenb = expdest - stackblock() - startloc;
varlen = varlenb;
if (localeisutf8) {
val = stackblock() + startloc;
for (;val != expdest; val++)
if ((*val & 0xC0) == 0x80)
varlen--;
}
STADJUST(-varlenb, expdest);
}
} else {
char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
: BASESYNTAX;
if (subtype == VSLENGTH) {
for (;*val; val++)
if (!localeisutf8 ||
(*val & 0xC0) != 0x80)
varlen++;
}
else {
if (quotes)
STPUTS_QUOTES(val, syntax, expdest);
else
STPUTS(val, expdest);
}
}
}
if (subtype == VSPLUS)
set = ! set;
easy = ((varflags & VSQUOTE) == 0 ||
(*var == '@' && shellparam.nparam != 1));
switch (subtype) {
case VSLENGTH:
expdest = cvtnum(varlen, expdest);
goto record;
case VSNORMAL:
if (!easy)
break;
record:
recordregion(startloc, expdest - stackblock(),
varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
(*var == '@' || *var == '*')));
break;
case VSPLUS:
case VSMINUS:
if (!set) {
argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
(varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
break;
}
if (easy)
goto record;
break;
case VSTRIMLEFT:
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
if (!set)
break;
/*
* Terminate the string and start recording the pattern
* right after it
*/
STPUTC('\0', expdest);
patloc = expdest - stackblock();
if (subevalvar(p, NULL, patloc, subtype,
startloc, varflags, quotes) == 0) {
int amount = (expdest - stackblock() - patloc) + 1;
STADJUST(-amount, expdest);
}
/* Remove any recorded regions beyond start of variable */
removerecordregions(startloc);
goto record;
case VSASSIGN:
case VSQUESTION:
if (!set) {
if (subevalvar(p, var, 0, subtype, startloc, varflags,
quotes)) {
varflags &= ~VSNUL;
/*
* Remove any recorded regions beyond
* start of variable
*/
removerecordregions(startloc);
goto again;
}
break;
}
if (easy)
goto record;
break;
case VSERROR:
c = p - var - 1;
error("${%.*s%s}: Bad substitution", c, var,
(c > 0 && *p != CTLENDVAR) ? "..." : "");
default:
abort();
}
p[-1] = '='; /* recover overwritten '=' */
if (subtype != VSNORMAL) { /* skip to end of alternative */
int nesting = 1;
for (;;) {
if ((c = *p++) == CTLESC)
p++;
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
if (set)
argbackq = argbackq->next;
} else if (c == CTLVAR) {
if ((*p++ & VSTYPE) != VSNORMAL)
nesting++;
} else if (c == CTLENDVAR) {
if (--nesting == 0)
break;
}
}
}
return p;
}
/*
* Test whether a specialized variable is set.
*/
static int
varisset(char *name, int nulok)
{
if (*name == '!')
return backgndpidset();
else if (*name == '@' || *name == '*') {
if (*shellparam.p == NULL)
return 0;
if (nulok) {
char **av;
for (av = shellparam.p; *av; av++)
if (**av != '\0')
return 1;
return 0;
}
} else if (is_digit(*name)) {
char *ap;
int num = atoi(name);
if (num > shellparam.nparam)
return 0;
if (num == 0)
ap = arg0;
else
ap = shellparam.p[num - 1];
if (nulok && (ap == NULL || *ap == '\0'))
return 0;
}
return 1;
}
static void
strtodest(const char *p, int flag, int subtype, int quoted)
{
if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
else
STPUTS(p, expdest);
}
/*
* Add the value of a specialized variable to the stack string.
*/
static void
varvalue(char *name, int quoted, int subtype, int flag)
{
int num;
char *p;
int i;
char sep;
char **ap;
switch (*name) {
case '$':
num = rootpid;
goto numvar;
case '?':
num = oexitstatus;
goto numvar;
case '#':
num = shellparam.nparam;
goto numvar;
case '!':
num = backgndpidval();
numvar:
expdest = cvtnum(num, expdest);
break;
case '-':
for (i = 0 ; i < NOPTS ; i++) {
if (optlist[i].val)
STPUTC(optlist[i].letter, expdest);
}
break;
case '@':
if (flag & EXP_FULL && quoted) {
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted);
if (*ap)
STPUTC('\0', expdest);
}
break;
}
/* FALLTHROUGH */
case '*':
if (ifsset())
sep = ifsval()[0];
else
sep = ' ';
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted);
if (!*ap)
break;
if (sep || (flag & EXP_FULL && !quoted && **ap != '\0'))
STPUTC(sep, expdest);
}
break;
case '0':
p = arg0;
strtodest(p, flag, subtype, quoted);
break;
default:
if (is_digit(*name)) {
num = atoi(name);
if (num > 0 && num <= shellparam.nparam) {
p = shellparam.p[num - 1];
strtodest(p, flag, subtype, quoted);
}
}
break;
}
}
/*
* Record the fact that we have to scan this region of the
* string for IFS characters.
*/
static void
recordregion(int start, int end, int inquotes)
{
struct ifsregion *ifsp;
if (ifslastp == NULL) {
ifsp = &ifsfirst;
} else {
if (ifslastp->endoff == start
&& ifslastp->inquotes == inquotes) {
/* extend previous area */
ifslastp->endoff = end;
return;
}
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
ifslastp->next = ifsp;
}
ifslastp = ifsp;
ifslastp->next = NULL;
ifslastp->begoff = start;
ifslastp->endoff = end;
ifslastp->inquotes = inquotes;
}
/*
* Break the argument string into pieces based upon IFS and add the
* strings to the argument list. The regions of the string to be
* searched for IFS characters have been stored by recordregion.
* CTLESC characters are preserved but have little effect in this pass
* other than escaping CTL* characters. In particular, they do not escape
* IFS characters: that should be done with the ifsregion mechanism.
* CTLQUOTEMARK characters are used to preserve empty quoted strings.
* This pass treats them as a regular character, making the string non-empty.
* Later, they are removed along with the other CTL* characters.
*/
static void
ifsbreakup(char *string, struct arglist *arglist)
{
struct ifsregion *ifsp;
struct strlist *sp;
char *start;
char *p;
char *q;
const char *ifs;
const char *ifsspc;
int had_param_ch = 0;
start = string;
if (ifslastp == NULL) {
/* Return entire argument, IFS doesn't apply to any of it */
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
return;
}
ifs = ifsset() ? ifsval() : " \t\n";
for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
p = string + ifsp->begoff;
while (p < string + ifsp->endoff) {
q = p;
if (*p == CTLESC)
p++;
if (ifsp->inquotes) {
/* Only NULs (should be from "$@") end args */
had_param_ch = 1;
if (*p != 0) {
p++;
continue;
}
ifsspc = NULL;
} else {
if (!strchr(ifs, *p)) {
had_param_ch = 1;
p++;
continue;
}
ifsspc = strchr(" \t\n", *p);
/* Ignore IFS whitespace at start */
if (q == start && ifsspc != NULL) {
p++;
start = p;
continue;
}
had_param_ch = 0;
}
/* Save this argument... */
*q = '\0';
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
p++;
if (ifsspc != NULL) {
/* Ignore further trailing IFS whitespace */
for (; p < string + ifsp->endoff; p++) {
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p) == NULL) {
p = q;
break;
}
if (strchr(" \t\n", *p) == NULL) {
p++;
break;
}
}
}
start = p;
}
}
/*
* Save anything left as an argument.
* Traditionally we have treated 'IFS=':'; set -- x$IFS' as
* generating 2 arguments, the second of which is empty.
* Some recent clarification of the Posix spec say that it
* should only generate one....
*/
if (had_param_ch || *start != 0) {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
}
static char expdir[PATH_MAX];
#define expdir_end (expdir + sizeof(expdir))
/*
* Perform pathname generation and remove control characters.
* At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
* The results are stored in the list exparg.
*/
static void
expandmeta(struct strlist *str, int flag __unused)
{
char *p;
struct strlist **savelastp;
struct strlist *sp;
char c;
/* TODO - EXP_REDIR */
while (str) {
if (fflag)
goto nometa;
p = str->text;
for (;;) { /* fast check for meta chars */
if ((c = *p++) == '\0')
goto nometa;
if (c == '*' || c == '?' || c == '[')
break;
}
savelastp = exparg.lastp;
INTOFF;
expmeta(expdir, str->text);
INTON;
if (exparg.lastp == savelastp) {
/*
* no matches
*/
nometa:
*exparg.lastp = str;
rmescapes(str->text);
exparg.lastp = &str->next;
} else {
*exparg.lastp = NULL;
*savelastp = sp = expsort(*savelastp);
while (sp->next != NULL)
sp = sp->next;
exparg.lastp = &sp->next;
}
str = str->next;
}
}
/*
* Do metacharacter (i.e. *, ?, [...]) expansion.
*/
static void
expmeta(char *enddir, char *name)
{
const char *p;
const char *q;
const char *start;
char *endname;
int metaflag;
struct stat statb;
DIR *dirp;
struct dirent *dp;
int atend;
int matchdot;
int esc;
int namlen;
metaflag = 0;
start = name;
for (p = name; esc = 0, *p; p += esc + 1) {
if (*p == '*' || *p == '?')
metaflag = 1;
else if (*p == '[') {
q = p + 1;
if (*q == '!' || *q == '^')
q++;
for (;;) {
while (*q == CTLQUOTEMARK)
q++;
if (*q == CTLESC)
q++;
if (*q == '/' || *q == '\0')
break;
if (*++q == ']') {
metaflag = 1;
break;
}
}
} else if (*p == '\0')
break;
else if (*p == CTLQUOTEMARK)
continue;
else {
if (*p == CTLESC)
esc++;
if (p[esc] == '/') {
if (metaflag)
break;
start = p + esc + 1;
}
}
}
if (metaflag == 0) { /* we've reached the end of the file name */
if (enddir != expdir)
metaflag++;
for (p = name ; ; p++) {
if (*p == CTLQUOTEMARK)
continue;
if (*p == CTLESC)
p++;
*enddir++ = *p;
if (*p == '\0')
break;
if (enddir == expdir_end)
return;
}
if (metaflag == 0 || lstat(expdir, &statb) >= 0)
addfname(expdir);
return;
}
endname = name + (p - name);
if (start != name) {
p = name;
while (p < start) {
while (*p == CTLQUOTEMARK)
p++;
if (*p == CTLESC)
p++;
*enddir++ = *p++;
if (enddir == expdir_end)
return;
}
}
if (enddir == expdir) {
p = ".";
} else if (enddir == expdir + 1 && *expdir == '/') {
p = "/";
} else {
p = expdir;
enddir[-1] = '\0';
}
if ((dirp = opendir(p)) == NULL)
return;
if (enddir != expdir)
enddir[-1] = '/';
if (*endname == 0) {
atend = 1;
} else {
atend = 0;
*endname = '\0';
endname += esc + 1;
}
matchdot = 0;
p = start;
while (*p == CTLQUOTEMARK)
p++;
if (*p == CTLESC)
p++;
if (*p == '.')
matchdot++;
while (! int_pending() && (dp = readdir(dirp)) != NULL) {
if (dp->d_name[0] == '.' && ! matchdot)
continue;
if (patmatch(start, dp->d_name, 0)) {
namlen = dp->d_namlen;
if (enddir + namlen + 1 > expdir_end)
continue;
memcpy(enddir, dp->d_name, namlen + 1);
if (atend)
addfname(expdir);
else {
if (dp->d_type != DT_UNKNOWN &&
dp->d_type != DT_DIR &&
dp->d_type != DT_LNK)
continue;
if (enddir + namlen + 2 > expdir_end)
continue;
enddir[namlen] = '/';
enddir[namlen + 1] = '\0';
expmeta(enddir + namlen + 1, endname);
}
}
}
closedir(dirp);
if (! atend)
endname[-esc - 1] = esc ? CTLESC : '/';
}
/*
* Add a file name to the list.
*/
static void
addfname(char *name)
{
char *p;
struct strlist *sp;
size_t len;
len = strlen(name);
p = stalloc(len + 1);
memcpy(p, name, len + 1);
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = p;
*exparg.lastp = sp;
exparg.lastp = &sp->next;
}
/*
* Sort the results of file name expansion. It calculates the number of
* strings to sort and then calls msort (short for merge sort) to do the
* work.
*/
static struct strlist *
expsort(struct strlist *str)
{
int len;
struct strlist *sp;
len = 0;
for (sp = str ; sp ; sp = sp->next)
len++;
return msort(str, len);
}
static struct strlist *
msort(struct strlist *list, int len)
{
struct strlist *p, *q = NULL;
struct strlist **lpp;
int half;
int n;
if (len <= 1)
return list;
half = len >> 1;
p = list;
for (n = half ; --n >= 0 ; ) {
q = p;
p = p->next;
}
q->next = NULL; /* terminate first half of list */
q = msort(list, half); /* sort first half of list */
p = msort(p, len - half); /* sort second half */
lpp = &list;
for (;;) {
if (strcmp(p->text, q->text) < 0) {
*lpp = p;
lpp = &p->next;
if ((p = *lpp) == NULL) {
*lpp = q;
break;
}
} else {
*lpp = q;
lpp = &q->next;
if ((q = *lpp) == NULL) {
*lpp = p;
break;
}
}
}
return list;
}
static wchar_t
get_wc(const char **p)
{
wchar_t c;
int chrlen;
chrlen = mbtowc(&c, *p, 4);
if (chrlen == 0)
return 0;
else if (chrlen == -1)
c = 0;
else
*p += chrlen;
return c;
}
/*
* See if a character matches a character class, starting at the first colon
* of "[:class:]".
* If a valid character class is recognized, a pointer to the next character
* after the final closing bracket is stored into *end, otherwise a null
* pointer is stored into *end.
*/
static int
match_charclass(const char *p, wchar_t chr, const char **end)
{
char name[20];
const char *nameend;
wctype_t cclass;
*end = NULL;
p++;
nameend = strstr(p, ":]");
if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) ||
nameend == p)
return 0;
memcpy(name, p, nameend - p);
name[nameend - p] = '\0';
*end = nameend + 2;
cclass = wctype(name);
/* An unknown class matches nothing but is valid nevertheless. */
if (cclass == 0)
return 0;
return iswctype(chr, cclass);
}
/*
* Returns true if the pattern matches the string.
*/
static int
patmatch(const char *pattern, const char *string, int squoted)
{
const char *p, *q, *end;
const char *bt_p, *bt_q;
char c;
wchar_t wc, wc2;
p = pattern;
q = string;
bt_p = NULL;
bt_q = NULL;
for (;;) {
switch (c = *p++) {
case '\0':
if (*q != '\0')
goto backtrack;
return 1;
case CTLESC:
if (squoted && *q == CTLESC)
q++;
if (*q++ != *p++)
goto backtrack;
break;
case CTLQUOTEMARK:
continue;
case '?':
if (squoted && *q == CTLESC)
q++;
if (*q == '\0')
return 0;
if (localeisutf8) {
wc = get_wc(&q);
/*
* A '?' does not match invalid UTF-8 but a
* '*' does, so backtrack.
*/
if (wc == 0)
goto backtrack;
} else
wc = (unsigned char)*q++;
break;
case '*':
c = *p;
while (c == CTLQUOTEMARK || c == '*')
c = *++p;
/*
* If the pattern ends here, we know the string
* matches without needing to look at the rest of it.
*/
if (c == '\0')
return 1;
/*
* First try the shortest match for the '*' that
* could work. We can forget any earlier '*' since
* there is no way having it match more characters
* can help us, given that we are already here.
*/
bt_p = p;
bt_q = q;
break;
case '[': {
const char *endp;
int invert, found;
wchar_t chr;
endp = p;
if (*endp == '!' || *endp == '^')
endp++;
for (;;) {
while (*endp == CTLQUOTEMARK)
endp++;
if (*endp == 0)
goto dft; /* no matching ] */
if (*endp == CTLESC)
endp++;
if (*++endp == ']')
break;
}
invert = 0;
if (*p == '!' || *p == '^') {
invert++;
p++;
}
found = 0;
if (squoted && *q == CTLESC)
q++;
if (*q == '\0')
return 0;
if (localeisutf8) {
chr = get_wc(&q);
if (chr == 0)
goto backtrack;
} else
chr = (unsigned char)*q++;
c = *p++;
do {
if (c == CTLQUOTEMARK)
continue;
if (c == '[' && *p == ':') {
found |= match_charclass(p, chr, &end);
if (end != NULL)
p = end;
}
if (c == CTLESC)
c = *p++;
if (localeisutf8 && c & 0x80) {
p--;
wc = get_wc(&p);
if (wc == 0) /* bad utf-8 */
return 0;
} else
wc = (unsigned char)c;
if (*p == '-' && p[1] != ']') {
p++;
while (*p == CTLQUOTEMARK)
p++;
if (*p == CTLESC)
p++;
if (localeisutf8) {
wc2 = get_wc(&p);
if (wc2 == 0) /* bad utf-8 */
return 0;
} else
wc2 = (unsigned char)*p++;
if ( collate_range_cmp(chr, wc) >= 0
&& collate_range_cmp(chr, wc2) <= 0
)
found = 1;
} else {
if (chr == wc)
found = 1;
}
} while ((c = *p++) != ']');
if (found == invert)
goto backtrack;
break;
}
dft: default:
if (squoted && *q == CTLESC)
q++;
if (*q == '\0')
return 0;
if (*q++ == c)
break;
backtrack:
/*
* If we have a mismatch (other than hitting the end
* of the string), go back to the last '*' seen and
* have it match one additional character.
*/
if (bt_p == NULL)
return 0;
if (squoted && *bt_q == CTLESC)
bt_q++;
if (*bt_q == '\0')
return 0;
bt_q++;
p = bt_p;
q = bt_q;
break;
}
}
}
/*
* Remove any CTLESC and CTLQUOTEMARK characters from a string.
*/
void
rmescapes(char *str)
{
char *p, *q;
p = str;
while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
if (*p++ == '\0')
return;
}
q = p;
while (*p) {
if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
p++;
continue;
}
if (*p == CTLESC)
p++;
*q++ = *p++;
}
*q = '\0';
}
/*
* See if a pattern matches in a case statement.
*/
int
casematch(union node *pattern, const char *val)
{
struct stackmark smark;
int result;
char *p;
setstackmark(&smark);
argbackq = pattern->narg.backquote;
STARTSTACKSTR(expdest);
ifslastp = NULL;
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
STPUTC('\0', expdest);
p = grabstackstr(expdest);
result = patmatch(p, val, 0);
popstackmark(&smark);
return result;
}
/*
* Our own itoa().
*/
static char *
cvtnum(int num, char *buf)
{
char temp[32];
int neg = num < 0;
char *p = temp + 31;
temp[31] = '\0';
do {
*--p = num % 10 + '0';
} while ((num /= 10) != 0);
if (neg)
*--p = '-';
STPUTS(p, buf);
return buf;
}
/*
* Do most of the work for wordexp(3).
*/
int
wordexpcmd(int argc, char **argv)
{
size_t len;
int i;
out1fmt("%08x", argc - 1);
for (i = 1, len = 0; i < argc; i++)
len += strlen(argv[i]);
out1fmt("%08x", (int)len);
for (i = 1; i < argc; i++)
outbin(argv[i], strlen(argv[i]) + 1, out1);
return (0);
}
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