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8920da128d
NetBSD/bin/sh/expand.c
christos fbac2e9de2 Fixed new bug the previous fix introduced: 
false
    foo=bar
    echo $?

would print 1
Also fixed the long standing bug:

    false
    echo `echo $?`

would print 0
The exitstatus needs rethinking and rewriting. The trial and error method
is not very efficient
1995-05-15 02:47:38 +00:00

1340 lines
25 KiB
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/* $NetBSD: expand.c,v 1.19 1995/05/15 02:47:41 christos Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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";
#else
static char rcsid[] = "$NetBSD: expand.c,v 1.19 1995/05/15 02:47:41 christos Exp $";
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <errno.h>
#include <dirent.h>
#include <unistd.h>
#include <pwd.h>
#include <stdlib.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"
/*
* 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 nulonly; /* search for nul bytes only */
};
char *expdest; /* output of current string */
struct nodelist *argbackq; /* list of back quote expressions */
struct ifsregion ifsfirst; /* first struct in list of ifs regions */
struct ifsregion *ifslastp; /* last struct in list */
struct arglist exparg; /* holds expanded arg list */
STATIC void argstr __P((char *, int));
STATIC char *exptilde __P((char *, int));
STATIC void expbackq __P((union node *, int, int));
STATIC int subevalvar __P((char *, char *, int, int, int));
STATIC char *evalvar __P((char *, int));
STATIC int varisset __P((int));
STATIC void varvalue __P((int, int, int));
STATIC void recordregion __P((int, int, int));
STATIC void ifsbreakup __P((char *, struct arglist *));
STATIC void expandmeta __P((struct strlist *, int));
STATIC void expmeta __P((char *, char *));
STATIC void addfname __P((char *));
STATIC struct strlist *expsort __P((struct strlist *));
STATIC struct strlist *msort __P((struct strlist *, int));
STATIC int pmatch __P((char *, char *));
STATIC char *cvtnum __P((int, char *));
/*
* Expand shell variables and backquotes inside a here document.
*/
void
expandhere(arg, fd)
union node *arg; /* the document */
int fd; /* where to write the expanded version */
{
herefd = fd;
expandarg(arg, (struct arglist *)NULL, 0);
xwrite(fd, stackblock(), expdest - stackblock());
}
/*
* Perform variable substitution and command substitution on an argument,
* placing the resulting list of arguments in arglist. If EXP_FULL is true,
* perform splitting and file name expansion. When arglist is NULL, perform
* here document expansion.
*/
void
expandarg(arg, arglist, flag)
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) {
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 variable and command substitution. If EXP_FULL is set, output CTLESC
* characters to allow for further processing. Otherwise treat
* $@ like $* since no splitting will be performed.
*/
STATIC void
argstr(p, flag)
register char *p;
int flag;
{
register char c;
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
int firsteq = 1;
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
switch (c = *p++) {
case '\0':
case CTLENDVAR: /* ??? */
goto breakloop;
case CTLESC:
if (quotes)
STPUTC(c, expdest);
c = *p++;
STPUTC(c, expdest);
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).
*/
STPUTC(c, expdest);
if (flag & EXP_VARTILDE && *p == '~') {
if (c == '=') {
if (firsteq)
firsteq = 0;
else
break;
}
p = exptilde(p, flag);
}
break;
default:
STPUTC(c, expdest);
}
}
breakloop:;
}
STATIC char *
exptilde(p, flag)
char *p;
int flag;
{
char c, *startp = p;
struct passwd *pw;
char *home;
int quotes = flag & (EXP_FULL | EXP_CASE);
while ((c = *p) != '\0') {
switch(c) {
case CTLESC:
return (startp);
case ':':
if (flag & EXP_VARTILDE)
goto done;
break;
case '/':
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;
while ((c = *home++) != '\0') {
if (quotes && SQSYNTAX[c] == CCTL)
STPUTC(CTLESC, expdest);
STPUTC(c, expdest);
}
return (p);
lose:
*p = c;
return (startp);
}
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
*/
void
expari(flag)
int flag;
{
char *p, *start;
int result;
int quotes = flag & (EXP_FULL | EXP_CASE);
/*
* This routine is slightly over-compilcated for
* efficiency. First we make sure there is
* enough space for the result, which may be bigger
* than the expression if we add exponentation. 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(8, expdest);
USTPUTC('\0', expdest);
start = stackblock();
p = expdest;
while (*p != CTLARI && p >= start)
--p;
if (*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 (quotes)
rmescapes(p+1);
result = arith(p+1);
fmtstr(p, 10, "%d", result);
while (*p++)
;
result = expdest - p + 1;
STADJUST(-result, expdest);
}
/*
* Expand stuff in backwards quotes.
*/
STATIC void
expbackq(cmd, quoted, flag)
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 saveherefd;
int quotes = flag & (EXP_FULL | EXP_CASE);
INTOFF;
saveifs = ifsfirst;
savelastp = ifslastp;
saveargbackq = argbackq;
saveherefd = herefd;
herefd = -1;
p = grabstackstr(dest);
evalbackcmd(cmd, &in);
ungrabstackstr(p, dest);
ifsfirst = saveifs;
ifslastp = savelastp;
argbackq = saveargbackq;
herefd = saveherefd;
p = in.buf;
lastc = '\0';
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 (quotes && syntax[lastc] == CCTL)
STPUTC(CTLESC, dest);
STPUTC(lastc, dest);
}
}
/* Eat all trailing newlines */
for (p--; lastc == '\n'; lastc = *--p)
STUNPUTC(dest);
if (in.fd >= 0)
close(in.fd);
if (in.buf)
ckfree(in.buf);
if (in.jp)
exitstatus = waitforjob(in.jp);
if (quoted == 0)
recordregion(startloc, dest - stackblock(), 0);
TRACE(("evalbackq: size=%d: \"%.*s\"\n",
(dest - stackblock()) - startloc,
(dest - stackblock()) - startloc,
stackblock() + startloc));
expdest = dest;
INTON;
}
STATIC int
subevalvar(p, str, subtype, startloc, varflags)
char *p;
char *str;
int subtype;
int startloc;
int varflags;
{
char *startp;
char *loc;
int c = 0;
int saveherefd = herefd;
struct nodelist *saveargbackq = argbackq;
herefd = -1;
argstr(p, 0);
STACKSTRNUL(expdest);
herefd = saveherefd;
argbackq = saveargbackq;
startp = stackblock() + startloc;
switch (subtype) {
case VSASSIGN:
setvar(str, startp, 0);
STADJUST(startp - expdest, expdest);
varflags &= ~VSNUL;
if (c != 0)
*loc = c;
return 1;
case VSQUESTION:
if (*p != CTLENDVAR) {
outfmt(&errout, "%s\n", startp);
error((char *)NULL);
}
error("%.*s: parameter %snot set", p - str - 1,
str, (varflags & VSNUL) ? "null or "
: nullstr);
return 0;
case VSTRIMLEFT:
for (loc = startp; loc < str - 1; loc++) {
c = *loc;
*loc = '\0';
if (patmatch(str, startp)) {
*loc = c;
goto recordleft;
}
*loc = c;
}
return 0;
case VSTRIMLEFTMAX:
for (loc = str - 1; loc >= startp; loc--) {
c = *loc;
*loc = '\0';
if (patmatch(str, startp)) {
*loc = c;
goto recordleft;
}
*loc = c;
}
return 0;
case VSTRIMRIGHT:
for (loc = str - 1; loc >= startp; loc--) {
if (patmatch(str, loc)) {
expdest = loc;
return 1;
}
}
return 0;
case VSTRIMRIGHTMAX:
for (loc = startp; loc < str - 1; loc++) {
if (patmatch(str, loc)) {
expdest = loc;
return 1;
}
}
return 0;
default:
abort();
}
recordleft:
expdest = (str - 1) - (loc - startp);
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(p, flag)
char *p;
int flag;
{
int subtype;
int varflags;
char *var;
char *val;
char *pat;
int c;
int set;
int special;
int startloc;
int varlen;
int easy;
int quotes = flag & (EXP_FULL | EXP_CASE);
varflags = *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 (special) {
set = varisset(*var);
val = NULL;
} else {
val = lookupvar(var);
if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
val = NULL;
set = 0;
} else
set = 1;
}
varlen = 0;
startloc = expdest - stackblock();
if (set && subtype != VSPLUS) {
/* insert the value of the variable */
if (special) {
char *exp, *oexpdest = expdest;
varvalue(*var, varflags & VSQUOTE, flag & EXP_FULL);
if (subtype == VSLENGTH) {
for (exp = oexpdest;exp != expdest; exp++)
varlen++;
expdest = oexpdest;
}
} else {
char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
: BASESYNTAX;
if (subtype == VSLENGTH) {
for (;*val; val++)
varlen++;
}
else {
while (*val) {
if (quotes && syntax[*val] == CCTL)
STPUTC(CTLESC, expdest);
STPUTC(*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);
break;
case VSPLUS:
case VSMINUS:
if (!set) {
argstr(p, flag);
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);
pat = expdest;
if (subevalvar(p, pat, subtype, startloc, varflags))
goto record;
break;
case VSASSIGN:
case VSQUESTION:
if (!set) {
if (subevalvar(p, var, subtype, startloc, varflags))
goto again;
break;
}
if (easy)
goto record;
break;
default:
abort();
}
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(name)
char name;
{
char **ap;
if (name == '!') {
if (backgndpid == -1)
return 0;
} else if (name == '@' || name == '*') {
if (*shellparam.p == NULL)
return 0;
} else if ((unsigned)(name -= '1') <= '9' - '1') {
ap = shellparam.p;
do {
if (*ap++ == NULL)
return 0;
} while (--name >= 0);
}
return 1;
}
/*
* Add the value of a specialized variable to the stack string.
*/
STATIC void
varvalue(name, quoted, allow_split)
char name;
int quoted;
int allow_split;
{
int num;
char *p;
int i;
extern int oexitstatus;
char sep;
char **ap;
char const *syntax;
#define STRTODEST(p) \
do {\
if (allow_split) { \
syntax = quoted? DQSYNTAX : BASESYNTAX; \
while (*p) { \
if (syntax[*p] == CCTL) \
STPUTC(CTLESC, expdest); \
STPUTC(*p++, expdest); \
} \
} else \
while (*p) \
STPUTC(*p++, expdest); \
} while (0)
switch (name) {
case '$':
num = rootpid;
goto numvar;
case '?':
num = oexitstatus;
goto numvar;
case '#':
num = shellparam.nparam;
goto numvar;
case '!':
num = backgndpid;
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 (allow_split) {
sep = '\0';
goto allargs;
}
/* fall through */
case '*':
sep = ' ';
allargs:
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
STRTODEST(p);
if (*ap)
STPUTC(sep, expdest);
}
break;
case '0':
p = arg0;
STRTODEST(p);
break;
default:
if ((unsigned)(name -= '1') <= '9' - '1') {
p = shellparam.p[name];
STRTODEST(p);
}
break;
}
}
/*
* Record the the fact that we have to scan this region of the
* string for IFS characters.
*/
STATIC void
recordregion(start, end, nulonly)
int start;
int end;
int nulonly;
{
register struct ifsregion *ifsp;
if (ifslastp == NULL) {
ifsp = &ifsfirst;
} else {
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
ifslastp->next = ifsp;
}
ifslastp = ifsp;
ifslastp->next = NULL;
ifslastp->begoff = start;
ifslastp->endoff = end;
ifslastp->nulonly = nulonly;
}
/*
* Break the argument string into pieces based upon IFS and add the
* strings to the argument list. The regions of the string to be
* searched for IFS characters have been stored by recordregion.
*/
STATIC void
ifsbreakup(string, arglist)
char *string;
struct arglist *arglist;
{
struct ifsregion *ifsp;
struct strlist *sp;
char *start;
register char *p;
char *q;
char *ifs;
int ifsspc;
start = string;
if (ifslastp != NULL) {
ifsp = &ifsfirst;
do {
p = string + ifsp->begoff;
ifs = ifsp->nulonly? nullstr : ifsval();
ifsspc = strchr(ifs, ' ') != NULL;
while (p < string + ifsp->endoff) {
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p++)) {
if (q > start || !ifsspc) {
*q = '\0';
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
if (ifsspc) {
for (;;) {
if (p >= string + ifsp->endoff)
break;
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p++) == NULL) {
p = q;
break;
}
}
}
start = p;
}
}
} while ((ifsp = ifsp->next) != NULL);
if (*start || (!ifsspc && start > string)) {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
} else {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
}
/*
* Expand shell metacharacters. At this point, the only control characters
* should be escapes. The results are stored in the list exparg.
*/
char *expdir;
STATIC void
expandmeta(str, flag)
struct strlist *str;
int flag;
{
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 == '[' || c == '!')
break;
}
savelastp = exparg.lastp;
INTOFF;
if (expdir == NULL) {
int i = strlen(str->text);
expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
}
expmeta(expdir, str->text);
ckfree(expdir);
expdir = NULL;
INTON;
if (exparg.lastp == savelastp) {
/*
* 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(enddir, name)
char *enddir;
char *name;
{
register char *p;
char *q;
char *start;
char *endname;
int metaflag;
struct stat statb;
DIR *dirp;
struct dirent *dp;
int atend;
int matchdot;
metaflag = 0;
start = name;
for (p = name ; ; p++) {
if (*p == '*' || *p == '?')
metaflag = 1;
else if (*p == '[') {
q = p + 1;
if (*q == '!')
q++;
for (;;) {
if (*q == CTLESC)
q++;
if (*q == '/' || *q == '\0')
break;
if (*++q == ']') {
metaflag = 1;
break;
}
}
} else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
metaflag = 1;
} else if (*p == '\0')
break;
else if (*p == CTLESC)
p++;
if (*p == '/') {
if (metaflag)
break;
start = p + 1;
}
}
if (metaflag == 0) { /* we've reached the end of the file name */
if (enddir != expdir)
metaflag++;
for (p = name ; ; p++) {
if (*p == CTLESC)
p++;
*enddir++ = *p;
if (*p == '\0')
break;
}
if (metaflag == 0 || stat(expdir, &statb) >= 0)
addfname(expdir);
return;
}
endname = p;
if (start != name) {
p = name;
while (p < start) {
if (*p == CTLESC)
p++;
*enddir++ = *p++;
}
}
if (enddir == expdir) {
p = ".";
} else if (enddir == expdir + 1 && *expdir == '/') {
p = "/";
} else {
p = expdir;
enddir[-1] = '\0';
}
if ((dirp = opendir(p)) == NULL)
return;
if (enddir != expdir)
enddir[-1] = '/';
if (*endname == 0) {
atend = 1;
} else {
atend = 0;
*endname++ = '\0';
}
matchdot = 0;
if (start[0] == '.' || (start[0] == CTLESC && start[1] == '.'))
matchdot++;
while (! int_pending() && (dp = readdir(dirp)) != NULL) {
if (dp->d_name[0] == '.' && ! matchdot)
continue;
if (patmatch(start, dp->d_name)) {
if (atend) {
scopy(dp->d_name, enddir);
addfname(expdir);
} else {
char *q;
for (p = enddir, q = dp->d_name;
(*p++ = *q++) != '\0';)
continue;
p[-1] = '/';
expmeta(p, endname);
}
}
}
closedir(dirp);
if (! atend)
endname[-1] = '/';
}
/*
* Add a file name to the list.
*/
STATIC void
addfname(name)
char *name;
{
char *p;
struct strlist *sp;
p = stalloc(strlen(name) + 1);
scopy(name, p);
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = p;
*exparg.lastp = sp;
exparg.lastp = &sp->next;
}
/*
* Sort the results of file name expansion. It calculates the number of
* strings to sort and then calls msort (short for merge sort) to do the
* work.
*/
STATIC struct strlist *
expsort(str)
struct strlist *str;
{
int len;
struct strlist *sp;
len = 0;
for (sp = str ; sp ; sp = sp->next)
len++;
return msort(str, len);
}
STATIC struct strlist *
msort(list, len)
struct strlist *list;
int len;
{
struct strlist *p, *q;
struct strlist **lpp;
int half;
int n;
if (len <= 1)
return list;
half = len >> 1;
p = list;
for (n = half ; --n >= 0 ; ) {
q = p;
p = p->next;
}
q->next = NULL; /* terminate first half of list */
q = msort(list, half); /* sort first half of list */
p = msort(p, len - half); /* sort second half */
lpp = &list;
for (;;) {
if (strcmp(p->text, q->text) < 0) {
*lpp = p;
lpp = &p->next;
if ((p = *lpp) == NULL) {
*lpp = q;
break;
}
} else {
*lpp = q;
lpp = &q->next;
if ((q = *lpp) == NULL) {
*lpp = p;
break;
}
}
}
return list;
}
/*
* Returns true if the pattern matches the string.
*/
int
patmatch(pattern, string)
char *pattern;
char *string;
{
#ifdef notdef
if (pattern[0] == '!' && pattern[1] == '!')
return 1 - pmatch(pattern + 2, string);
else
#endif
return pmatch(pattern, string);
}
STATIC int
pmatch(pattern, string)
char *pattern;
char *string;
{
register char *p, *q;
register char c;
p = pattern;
q = string;
for (;;) {
switch (c = *p++) {
case '\0':
goto breakloop;
case CTLESC:
if (*q++ != *p++)
return 0;
break;
case '?':
if (*q++ == '\0')
return 0;
break;
case '*':
c = *p;
if (c != CTLESC && c != '?' && c != '*' && c != '[') {
while (*q != c) {
if (*q == '\0')
return 0;
q++;
}
}
do {
if (pmatch(p, q))
return 1;
} while (*q++ != '\0');
return 0;
case '[': {
char *endp;
int invert, found;
char chr;
endp = p;
if (*endp == '!')
endp++;
for (;;) {
if (*endp == '\0')
goto dft; /* no matching ] */
if (*endp == CTLESC)
endp++;
if (*++endp == ']')
break;
}
invert = 0;
if (*p == '!') {
invert++;
p++;
}
found = 0;
chr = *q++;
if (chr == '\0')
return 0;
c = *p++;
do {
if (c == CTLESC)
c = *p++;
if (*p == '-' && p[1] != ']') {
p++;
if (*p == CTLESC)
p++;
if (chr >= c && chr <= *p)
found = 1;
p++;
} else {
if (chr == c)
found = 1;
}
} while ((c = *p++) != ']');
if (found == invert)
return 0;
break;
}
dft: default:
if (*q++ != c)
return 0;
break;
}
}
breakloop:
if (*q != '\0')
return 0;
return 1;
}
/*
* Remove any CTLESC characters from a string.
*/
void
rmescapes(str)
char *str;
{
register char *p, *q;
p = str;
while (*p != CTLESC) {
if (*p++ == '\0')
return;
}
q = p;
while (*p) {
if (*p == CTLESC)
p++;
*q++ = *p++;
}
*q = '\0';
}
/*
* See if a pattern matches in a case statement.
*/
int
casematch(pattern, val)
union node *pattern;
char *val;
{
struct stackmark smark;
int result;
char *p;
setstackmark(&smark);
argbackq = pattern->narg.backquote;
STARTSTACKSTR(expdest);
ifslastp = NULL;
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
STPUTC('\0', expdest);
p = grabstackstr(expdest);
result = patmatch(p, val);
popstackmark(&smark);
return result;
}
/*
* Our own itoa().
*/
STATIC char *
cvtnum(num, buf)
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 = '-';
while (*p)
STPUTC(*p++, buf);
return buf;
}
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