/*
* 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.
*
* When doing something that may cause this to be re-entered, make sure
* the stack string is empty via grabstackstr() and do not assume expdest
* remains valid.
*/
void
expandarg(union node *arg, struct arglist *arglist, int flag)
{
struct worddest exparg;
struct nodelist *argbackq;
if (fflag)
flag &= ~EXP_GLOB;
argbackq = arg->narg.backquote;
exparg.list = arglist;
exparg.state = WORD_IDLE;
STARTSTACKSTR(expdest);
argstr(arg->narg.text, &argbackq, flag, &exparg);
if (arglist == NULL) {
STACKSTRNUL(expdest);
return; /* here document expanded */
}
if ((flag & EXP_SPLIT) == 0 || expdest != stackblock() ||
exparg.state == WORD_QUOTEMARK) {
STPUTC('\0', expdest);
if (flag & EXP_SPLIT) {
if (flag & EXP_GLOB)
expandmeta(grabstackstr(expdest), exparg.list);
else
appendarglist(exparg.list, grabstackstr(expdest));
}
}
if ((flag & EXP_SPLIT) == 0)
appendarglist(arglist, grabstackstr(expdest));
}
/*
* Expand arithmetic expression.
*/
static char *
expari(char *p, int flag, struct worddest *dst)
{
char *q, *start;
arith_t result;
int begoff;
int quoted;
int adj;
quoted = *p++ == '"';
begoff = expdest - stackblock();
p = argstr(p, 0, NULL);
STPUTC('\0', expdest);
start = stackblock() + begoff;
q = grabstackstr(expdest);
result = arith(start);
ungrabstackstr(q, expdest);
start = stackblock() + begoff;
adj = start - expdest;
STADJUST(adj, expdest);
CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest);
fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result);
adj = strlen(expdest);
STADJUST(adj, expdest);
if (!quoted)
reprocess(expdest - adj - stackblock(), flag, VSNORMAL, 0, dst);
return p;
}
/*
* Expand arithmetic expression.
* Note that flag is not required as digits never require CTLESC characters.
*/
static char *
expari(char *p)
{
char *q, *start;
arith_t result;
int begoff;
int quoted;
int adj;
quoted = *p++ == '"';
begoff = expdest - stackblock();
p = argstr(p, 0);
removerecordregions(begoff);
STPUTC('\0', expdest);
start = stackblock() + begoff;
q = grabstackstr(expdest);
result = arith(start);
ungrabstackstr(q, expdest);
start = stackblock() + begoff;
adj = start - expdest;
STADJUST(adj, expdest);
CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest);
fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result);
adj = strlen(expdest);
STADJUST(adj, expdest);
if (!quoted)
recordregion(begoff, expdest - stackblock(), 0);
return p;
}
int
evalcmd(int argc, char **argv)
{
char *p;
char *concat;
char **ap;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
concat = stputs(p, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
return evalstring(p, ~SKIPEVAL);
}
return 0;
}
int
evalcmd(int argc, char **argv)
{
char *p;
char *concat;
char **ap;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
STPUTS(p, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
evalstring(p, builtin_flags);
} else
exitstatus = 0;
return exitstatus;
}
/*
* The exp(1) builtin.
*/
int
letcmd(int argc, char **argv)
{
const char *p;
char *concat;
char **ap;
arith_t i;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
/*
* Concatenate arguments.
*/
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
while (*p)
STPUTC(*p++, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
} else
p = "";
i = arith(p);
out1fmt(ARITH_FORMAT_STR "\n", i);
return !i;
}
int
evalcmd(shinstance *psh, int argc, char **argv)
{
char *p;
char *concat;
char **ap;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
STARTSTACKSTR(psh, concat);
ap = argv + 2;
for (;;) {
while (*p)
STPUTC(psh, *p++, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(psh, ' ', concat);
}
STPUTC(psh, '\0', concat);
p = grabstackstr(psh, concat);
}
evalstring(psh, p, EV_TESTED);
}
return psh->exitstatus;
}
int
evalcmd(int argc, char **argv)
{
char *p;
char *concat;
char **ap;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
while (*p)
STPUTC(*p++, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
evalstring(p);
}
return exitstatus;
}
/** handle one line of the read command.
* more fields than variables -> remainder shall be part of last variable.
* less fields than variables -> remaining variables unset.
*
* @param line complete line of input
* @param ap argument (variable) list
* @param len length of line including trailing '\0'
*/
static void
readcmd_handle_line(char *s, char **ap)
{
struct arglist arglist;
struct strlist *sl;
char *backup;
char *line;
/* ifsbreakup will fiddle with stack region... */
line = stackblock();
s = grabstackstr(s);
/* need a copy, so that delimiters aren't lost
* in case there are more fields than variables */
backup = sstrdup(line);
arglist.lastp = &arglist.list;
ifsbreakup(s, &arglist);
*arglist.lastp = NULL;
ifsfree();
sl = arglist.list;
do {
if (!sl) {
/* nullify remaining arguments */
do {
setvar(*ap, nullstr, 0);
} while (*++ap);
return;
}
/* remaining fields present, but no variables left. */
if (!ap[1] && sl->next) {
size_t offset;
char *remainder;
/* FIXME little bit hacky, assuming that ifsbreakup
* will not modify the length of the string */
offset = sl->text - s;
remainder = backup + offset;
rmescapes(remainder);
setvar(*ap, remainder, 0);
return;
}
/* set variable to field */
rmescapes(sl->text);
setvar(*ap, sl->text, 0);
sl = sl->next;
} while (*++ap);
}
/*
* 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, int32_t flag)
{
struct strlist* sp;
cstring_t 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)
{
pifsregion_t 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;
}
}
static char *
nextword(char c, int flag, char *p, struct worddest *dst)
{
int is_ws;
is_ws = c == '\t' || c == '\n' || c == ' ';
if (p != stackblock() || (is_ws ? dst->state == WORD_QUOTEMARK :
dst->state != WORD_WS_DELIMITED) || c == '\0') {
STPUTC('\0', p);
if (flag & EXP_GLOB)
expandmeta(grabstackstr(p), dst->list);
else
appendarglist(dst->list, grabstackstr(p));
dst->state = is_ws ? WORD_WS_DELIMITED : WORD_IDLE;
} else if (!is_ws && dst->state == WORD_WS_DELIMITED)
dst->state = WORD_IDLE;
/* Reserve space while the stack string is empty. */
appendarglist(dst->list, NULL);
dst->list->count--;
STARTSTACKSTR(p);
return p;
}
/*
* 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);
}
/*
* Expand arithmetic expression.
* Note that flag is not required as digits never require CTLESC characters.
*/
static char *
expari(char *p)
{
char *q, *start;
arith_t result;
int begoff;
int quoted;
int c;
int nesting;
int adj;
quoted = *p++ == '"';
begoff = expdest - stackblock();
argstr(p, 0);
removerecordregions(begoff);
STPUTC('\0', expdest);
start = stackblock() + begoff;
q = grabstackstr(expdest);
result = arith(start);
ungrabstackstr(q, expdest);
start = stackblock() + begoff;
adj = start - expdest;
STADJUST(adj, expdest);
CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest);
fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result);
adj = strlen(expdest);
STADJUST(adj, expdest);
if (!quoted)
recordregion(begoff, expdest - stackblock(), 0);
nesting = 1;
while (nesting > 0) {
c = *p++;
if (c == CTLESC)
p++;
else if (c == CTLARI)
nesting++;
else if (c == CTLENDARI)
nesting--;
else if (c == CTLVAR)
p++; /* ignore variable substitution byte */
else if (c == '\0')
return p - 1;
}
return p;
}
int
casematch(union node *pattern, const char *val)
{
struct stackmark smark;
int result;
char *p;
setstackmark(&smark);
argbackq = pattern->narg.backquote;
STARTSTACKSTR(expdest);
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE, NULL);
STPUTC('\0', expdest);
p = grabstackstr(expdest);
result = patmatch(p, val);
popstackmark(&smark);
return result;
}
int32_t
casematch(union node* pattern, const_cstring_t val)
{
struct stackmark smark;
int32_t result;
cstring_t 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;
}
int
casematch(shinstance *psh, union node *pattern, char *val)
{
struct stackmark smark;
int result;
char *p;
setstackmark(psh, &smark);
psh->argbackq = pattern->narg.backquote;
STARTSTACKSTR(psh, psh->expdest);
psh->ifslastp = NULL;
argstr(psh, pattern->narg.text, EXP_TILDE | EXP_CASE);
STPUTC(psh, '\0', psh->expdest);
p = grabstackstr(psh, psh->expdest);
result = patmatch(psh, p, val, 0);
popstackmark(psh, &smark);
return result;
}
/*
* 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;
if (flag & EXP_FULL) {
ifsbreakup(p, &exparg);
*exparg.lastp = NULL;
exparg.lastp = &exparg.list;
expandmeta(exparg.list);
} else {
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;
}
}
void
expandarg(shinstance *psh, union node *arg, struct arglist *arglist, int flag)
{
struct strlist *sp;
char *p;
psh->argbackq = arg->narg.backquote;
STARTSTACKSTR(psh, psh->expdest);
psh->ifsfirst.next = NULL;
psh->ifslastp = NULL;
argstr(psh, arg->narg.text, flag);
if (arglist == NULL) {
return; /* here document expanded */
}
STPUTC(psh, '\0', psh->expdest);
p = grabstackstr(psh, psh->expdest);
TRACE2((psh, "expandarg: p='%s'\n", p));
psh->exparg.lastp = &psh->exparg.list;
/*
* TODO - EXP_REDIR
*/
if (flag & EXP_FULL) {
ifsbreakup(psh, p, &psh->exparg);
*psh->exparg.lastp = NULL;
psh->exparg.lastp = &psh->exparg.list;
expandmeta(psh, psh->exparg.list, flag);
} else {
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
rmescapes(psh, p);
sp = (struct strlist *)stalloc(psh, sizeof (struct strlist));
sp->text = p;
*psh->exparg.lastp = sp;
psh->exparg.lastp = &sp->next;
}
ifsfree(psh);
*psh->exparg.lastp = NULL;
if (psh->exparg.list) {
*arglist->lastp = psh->exparg.list;
arglist->lastp = psh->exparg.lastp;
}
}
STATIC const char *
fc_replace(const char *s, char *p, char *r)
{
char *dest;
int plen = strlen(p);
STARTSTACKSTR(dest);
while (*s) {
if (*s == *p && strncmp(s, p, plen) == 0) {
while (*r)
STPUTC(*r++, dest);
s += plen;
*p = '\0'; /* so no more matches */
} else
STPUTC(*s++, dest);
}
STACKSTRNUL(dest);
dest = grabstackstr(dest);
return (dest);
}
/*
* 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);
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;
}
/*
* Perform command substitution.
*/
static void
expbackq(union node *cmd, int quoted, int flag, struct worddest *dst)
{
struct backcmd in;
int i;
char buf[128];
char *p;
char *dest = expdest;
struct nodelist *saveargbackq;
char lastc;
char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
int quotes = flag & (EXP_GLOB | EXP_CASE);
size_t nnl;
const char *ifs;
INTOFF;
saveargbackq = argbackq;
p = grabstackstr(dest);
evalbackcmd(cmd, &in);
ungrabstackstr(p, dest);
argbackq = saveargbackq;
p = in.buf;
lastc = '\0';
nnl = 0;
if (!quoted && flag & EXP_SPLIT)
ifs = ifsset() ? ifsval() : " \t\n";
else
ifs = "";
/* 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')
continue;
if (lastc == '\n') {
nnl++;
} else {
if (nnl > 0) {
if (strchr(ifs, '\n') != NULL) {
NEXTWORD('\n', flag, dest, dst);
nnl = 0;
} else {
CHECKSTRSPACE(nnl + 2, dest);
while (nnl > 0) {
nnl--;
USTPUTC('\n', dest);
}
}
}
if (strchr(ifs, lastc) != NULL)
NEXTWORD(lastc, flag, dest, dst);
else {
CHECKSTRSPACE(2, 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);
TRACE(("expbackq: size=%td: \"%.*s\"\n",
((dest - stackblock()) - startloc),
(int)((dest - stackblock()) - startloc),
stackblock() + startloc));
expdest = dest;
INTON;
}
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 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[(int)lastc] == CCTL)
STPUTC(CTLESC, dest);
STPUTC(lastc, dest);
}
}
/* Eat all trailing newlines */
p = stackblock() + startloc;
while (dest > p && dest[-1] == '\n')
STUNPUTC(dest);
if (in.fd >= 0)
close(in.fd);
if (in.buf)
ckfree(in.buf);
if (in.jp)
back_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 void
expbackq(shinstance *psh, union node *cmd, int quoted, int flag)
{
struct backcmd in;
int i;
char buf[128];
char *p;
char *dest = psh->expdest;
struct ifsregion saveifs, *savelastp;
struct nodelist *saveargbackq;
char lastc;
int startloc = (int)(dest - stackblock(psh));
char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
int saveherefd;
int quotes = flag & (EXP_FULL | EXP_CASE);
#ifdef SH_DEAL_WITH_CRLF
int pending_cr = 0;
#endif
INTOFF;
saveifs = psh->ifsfirst;
savelastp = psh->ifslastp;
saveargbackq = psh->argbackq;
saveherefd = psh->herefd;
psh->herefd = -1;
p = grabstackstr(psh, dest);
evalbackcmd(psh, cmd, &in);
ungrabstackstr(psh, p, dest);
psh->ifsfirst = saveifs;
psh->ifslastp = savelastp;
psh->argbackq = saveargbackq;
psh->herefd = saveherefd;
p = in.buf;
lastc = '\0';
for (;;) {
if (--in.nleft < 0) {
if (in.fd < 0)
break;
while ((i = shfile_read(&psh->fdtab, in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
TRACE((psh, "expbackq: read returns %d\n", i));
if (i <= 0)
break;
p = buf;
in.nleft = i - 1;
}
lastc = *p++;
#ifdef SH_DEAL_WITH_CRLF
if (pending_cr) {
pending_cr = 0;
if (lastc != '\n') {
if (quotes && syntax[(int)'\r'] == CCTL)
STPUTC(psh, CTLESC, dest);
STPUTC(psh, '\r', dest);
}
}
if (lastc == '\r')
pending_cr = '\r';
else
#endif
if (lastc != '\0') {
if (quotes && syntax[(int)lastc] == CCTL)
STPUTC(psh, CTLESC, dest);
STPUTC(psh, lastc, dest);
}
}
#ifdef SH_DEAL_WITH_CRLF
if (pending_cr) {
if (quotes && syntax[(int)'\r'] == CCTL)
STPUTC(psh, CTLESC, dest);
STPUTC(psh, '\r', dest);
}
#endif
/* Eat all trailing newlines */
p = stackblock(psh) + startloc;
while (dest > p && dest[-1] == '\n')
STUNPUTC(psh, dest);
if (in.fd >= 0)
shfile_close(&psh->fdtab, in.fd);
if (in.buf)
ckfree(psh, in.buf);
if (in.jp)
psh->back_exitstatus = waitforjob(psh, in.jp);
if (quoted == 0)
recordregion(psh, startloc, (int)(dest - stackblock(psh)), 0);
TRACE((psh, "evalbackq: size=%d: \"%.*s\"\n",
(dest - stackblock(psh)) - startloc,
(dest - stackblock(psh)) - startloc,
stackblock(psh) + startloc));
psh->expdest = dest;
INTON;
}