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);
}
static cstring_t
stputs_quotes(const_cstring_t data, const_cstring_t syntax, cstring_t p)
{
while (*data)
{
CHECKSTRSPACE(2, p);
if (syntax[(int32_t)*data] == CCTL)
USTPUTC(CTLESC, p);
USTPUTC(*data++, p);
}
return (p);
}
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
*/
void
expari(shinstance *psh, int flag)
{
char *p, *start;
int result;
int begoff;
int quotes = flag & (EXP_FULL | EXP_CASE);
int quoted;
/* ifsfree(); */
/*
* 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 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.
*/
#if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10
#error "integers with more than 10 digits are not supported"
#endif
CHECKSTRSPACE(psh, 12 - 2, psh->expdest);
USTPUTC(psh, '\0', psh->expdest);
start = stackblock(psh);
p = psh->expdest - 1;
while (*p != CTLARI && p >= start)
--p;
if (*p != CTLARI)
error(psh, "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 = (int)(p - start);
removerecordregions(psh, begoff);
if (quotes)
rmescapes(psh, p+2);
result = arith(psh, p+2);
fmtstr(p, 12, "%d", result);
while (*p++)
;
if (quoted == 0)
recordregion(psh, begoff, (int)(p - 1 - start), 0);
result = (int)(psh->expdest - p + 1);
STADJUST(psh, -result, psh->expdest);
}
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
*/
void
expari(int flag)
{
char *p, *start;
intmax_t result;
int adjustment;
int begoff;
int quotes = flag & (EXP_FULL | EXP_CASE);
int quoted;
/* ifsfree(); */
/*
* 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 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.
*/
/* SPACE_NEEDED is enough for all digits, plus possible "-", plus 2 (why?) */
#define SPACE_NEEDED ((sizeof(intmax_t) * CHAR_BIT + 2) / 3 + 1 + 2)
CHECKSTRSPACE((int)(SPACE_NEEDED - 2), expdest);
USTPUTC('\0', expdest);
start = stackblock();
p = expdest - 1;
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 (p[1] == '"')
quoted=1;
else
quoted=0;
begoff = p - start;
removerecordregions(begoff);
if (quotes)
rmescapes(p+2);
result = arith(p+2);
fmtstr(p, SPACE_NEEDED, "%"PRIdMAX, result);
while (*p++)
;
if (quoted == 0)
recordregion(begoff, p - 1 - start, 0);
adjustment = expdest - p + 1;
STADJUST(-adjustment, expdest);
}
static char *
stputs_split(const char *data, const char *syntax, int flag, char *p,
struct worddest *dst)
{
const char *ifs;
char c;
ifs = ifsset() ? ifsval() : " \t\n";
while (*data) {
CHECKSTRSPACE(2, p);
c = *data++;
if (strchr(ifs, c) != NULL) {
NEXTWORD(c, flag, p, dst);
continue;
}
if (flag & EXP_GLOB && syntax[(int)c] == CCTL)
USTPUTC(CTLESC, p);
USTPUTC(c, 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);
}
char *
single_quote(const char *s) {
char *p;
STARTSTACKSTR(p);
do {
char *q;
size_t len;
len = strchrnul(s, '\'') - s;
q = p = makestrspace(len + 3, p);
*q++ = '\'';
q = mempcpy(q, s, len);
*q++ = '\'';
s += len;
STADJUST(q - p, p);
len = strspn(s, "'");
if (!len)
break;
q = p = makestrspace(len + 3, p);
*q++ = '"';
q = mempcpy(q, s, len);
*q++ = '"';
s += len;
STADJUST(q - p, p);
} while (*s);
USTPUTC(0, p);
return stackblock();
}
/*
* 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 parameter expansion, command substitution and arithmetic
* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
* Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
* This is used to expand word in ${var+word} etc.
* If EXP_FULL or EXP_CASE are set, keep and/or generate CTLESC
* characters to allow for further processing.
* If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
*/
static char *
argstr(char *p, int flag)
{
char c;
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
int firsteq = 1;
int split_lit;
int lit_quoted;
split_lit = flag & EXP_SPLIT_LIT;
lit_quoted = flag & EXP_LIT_QUOTED;
flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
CHECKSTRSPACE(2, expdest);
switch (c = *p++) {
case '\0':
return (p - 1);
case CTLENDVAR:
case CTLENDARI:
return (p);
case CTLQUOTEMARK:
lit_quoted = 1;
/* "$@" 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 CTLARI:
p = expari(p);
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);
}
}
}
int
readcmd(int argc, char **argv)
{
char **ap;
char c;
int rflag;
char *prompt;
char *p;
int startloc;
int newloc;
int status;
int i;
rflag = 0;
prompt = NULL;
while ((i = nextopt("p:r")) != '\0') {
if (i == 'p')
prompt = optionarg;
else
rflag = 1;
}
if (prompt && isatty(0)) {
out2str(prompt);
#ifdef FLUSHERR
flushall();
#endif
}
if (*(ap = argptr) == NULL)
sh_error("arg count");
status = 0;
STARTSTACKSTR(p);
goto start;
for (;;) {
switch (read(0, &c, 1)) {
case 1:
break;
default:
if (errno == EINTR && !pendingsigs)
continue;
/* fall through */
case 0:
status = 1;
goto out;
}
if (c == '\0')
continue;
if (newloc >= startloc) {
if (c == '\n')
goto resetbs;
goto put;
}
if (!rflag && c == '\\') {
newloc = p - (char *)stackblock();
continue;
}
if (c == '\n')
break;
put:
CHECKSTRSPACE(2, p);
if (strchr(qchars, c))
USTPUTC(CTLESC, p);
USTPUTC(c, p);
if (newloc >= startloc) {
resetbs:
recordregion(startloc, newloc, 0);
start:
startloc = p - (char *)stackblock();
newloc = startloc - 1;
}
}
out:
recordregion(startloc, p - (char *)stackblock(), 0);
STACKSTRNUL(p);
readcmd_handle_line(p + 1, ap);
return status;
}
STATIC int
readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs)
{
int c = firstc;
char *out;
int len;
char line[EOFMARKLEN + 1];
struct nodelist *bqlist;
int quotef;
int dblquote;
int varnest; /* levels of variables expansion */
int arinest; /* levels of arithmetic expansion */
int parenlevel; /* levels of parens in arithmetic */
int oldstyle;
char const *prevsyntax; /* syntax before arithmetic */
int synentry;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &out;
(void) "ef;
(void) &dblquote;
(void) &varnest;
(void) &arinest;
(void) &parenlevel;
(void) &oldstyle;
(void) &prevsyntax;
(void) &syntax;
(void) &synentry;
#endif
startlinno = plinno;
dblquote = 0;
if (syntax == DQSYNTAX)
dblquote = 1;
quotef = 0;
bqlist = NULL;
varnest = 0;
arinest = 0;
parenlevel = 0;
STARTSTACKSTR(out);
loop: { /* for each line, until end of word */
CHECKEND(); /* set c to PEOF if at end of here document */
for (;;) { /* until end of line or end of word */
CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
synentry = syntax[c];
switch(synentry) {
case CNL: /* '\n' */
if (syntax == BASESYNTAX)
goto endword; /* exit outer loop */
USTPUTC(c, out);
plinno++;
if (doprompt)
setprompt(2);
else
setprompt(0);
c = pgetc();
goto loop; /* continue outer loop */
case CWORD:
USTPUTC(c, out);
break;
case CCTL:
if (eofmark == NULL || dblquote)
USTPUTC(CTLESC, out);
USTPUTC(c, out);
break;
case CBACK: /* backslash */
c = pgetc();
if (c == PEOF) {
USTPUTC('\\', out);
pungetc();
} else if (c == '\n') {
if (doprompt)
setprompt(2);
else
setprompt(0);
} else {
if (dblquote && c != '\\' &&
c != '`' && c != '$' &&
(c != '"' || eofmark != NULL))
USTPUTC('\\', out);
if (SQSYNTAX[c] == CCTL)
USTPUTC(CTLESC, out);
else if (eofmark == NULL)
USTPUTC(CTLQUOTEMARK, out);
USTPUTC(c, out);
quotef++;
}
break;
case CSQUOTE:
if (eofmark == NULL)
USTPUTC(CTLQUOTEMARK, out);
syntax = SQSYNTAX;
break;
case CDQUOTE:
if (eofmark == NULL)
USTPUTC(CTLQUOTEMARK, out);
syntax = DQSYNTAX;
dblquote = 1;
break;
case CENDQUOTE:
if (eofmark != NULL && arinest == 0 &&
varnest == 0) {
USTPUTC(c, out);
} else {
if (arinest) {
syntax = ARISYNTAX;
dblquote = 0;
} else if (eofmark == NULL) {
syntax = BASESYNTAX;
dblquote = 0;
}
quotef++;
}
break;
case CVAR: /* '$' */
PARSESUB(); /* parse substitution */
break;
case CENDVAR: /* '}' */
if (varnest > 0) {
varnest--;
USTPUTC(CTLENDVAR, out);
} else {
USTPUTC(c, out);
}
break;
case CLP: /* '(' in arithmetic */
parenlevel++;
USTPUTC(c, out);
break;
case CRP: /* ')' in arithmetic */
if (parenlevel > 0) {
USTPUTC(c, out);
--parenlevel;
} else {
if (pgetc() == ')') {
if (--arinest == 0) {
USTPUTC(CTLENDARI, out);
syntax = prevsyntax;
if (syntax == DQSYNTAX)
dblquote = 1;
else
dblquote = 0;
} else
USTPUTC(')', out);
} else {
/*
* unbalanced parens
* (don't 2nd guess - no error)
*/
pungetc();
USTPUTC(')', out);
}
}
break;
case CBQUOTE: /* '`' */
PARSEBACKQOLD();
break;
case CEOF:
goto endword; /* exit outer loop */
default:
if (varnest == 0)
goto endword; /* exit outer loop */
USTPUTC(c, out);
}
c = pgetc_macro();
}
}
endword:
if (syntax == ARISYNTAX)
synerror("Missing '))'");
if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
synerror("Unterminated quoted string");
if (varnest != 0) {
startlinno = plinno;
synerror("Missing '}'");
}
USTPUTC('\0', out);
len = out - stackblock();
out = stackblock();
if (eofmark == NULL) {
if ((c == '>' || c == '<')
&& quotef == 0
&& len <= 2
&& (*out == '\0' || is_digit(*out))) {
PARSEREDIR();
return lasttoken = TREDIR;
} else {
pungetc();
}
}
quoteflag = quotef;
backquotelist = bqlist;
grabstackblock(len);
wordtext = out;
return lasttoken = TWORD;
/* end of readtoken routine */
/*
* Check to see whether we are at the end of the here document. When this
* is called, c is set to the first character of the next input line. If
* we are at the end of the here document, this routine sets the c to PEOF.
*/
checkend: {
if (eofmark) {
if (striptabs) {
while (c == '\t')
c = pgetc();
}
if (c == *eofmark) {
if (pfgets(line, sizeof line) != NULL) {
char *p, *q;
p = line;
for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
if (*p == '\n' && *q == '\0') {
c = PEOF;
plinno++;
needprompt = doprompt;
} else {
pushstring(line, strlen(line), NULL);
}
}
}
}
goto checkend_return;
}
/*
* Parse a redirection operator. The variable "out" points to a string
* specifying the fd to be redirected. The variable "c" contains the
* first character of the redirection operator.
*/
parseredir: {
char fd = *out;
union node *np;
np = (union node *)stalloc(sizeof (struct nfile));
if (c == '>') {
np->nfile.fd = 1;
c = pgetc();
if (c == '>')
np->type = NAPPEND;
else if (c == '&')
np->type = NTOFD;
else if (c == '|')
np->type = NCLOBBER;
else {
np->type = NTO;
pungetc();
}
} else { /* c == '<' */
np->nfile.fd = 0;
c = pgetc();
if (c == '<') {
if (sizeof (struct nfile) != sizeof (struct nhere)) {
np = (union node *)stalloc(sizeof (struct nhere));
np->nfile.fd = 0;
}
np->type = NHERE;
heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
heredoc->here = np;
if ((c = pgetc()) == '-') {
heredoc->striptabs = 1;
} else {
heredoc->striptabs = 0;
pungetc();
}
} else if (c == '&')
np->type = NFROMFD;
else if (c == '>')
np->type = NFROMTO;
else {
np->type = NFROM;
pungetc();
}
}
if (fd != '\0')
np->nfile.fd = digit_val(fd);
redirnode = np;
goto parseredir_return;
}
/*
* Parse a substitution. At this point, we have read the dollar sign
* and nothing else.
*/
parsesub: {
int subtype;
int typeloc;
int flags;
char *p;
#ifndef GDB_HACK
static const char types[] = "}-+?=";
#endif
int bracketed_name = 0; /* used to handle ${[0-9]*} variables */
c = pgetc();
if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) {
USTPUTC('$', out);
pungetc();
} else if (c == '(') { /* $(command) or $((arith)) */
if (pgetc() == '(') {
PARSEARITH();
} else {
pungetc();
PARSEBACKQNEW();
}
} else {
USTPUTC(CTLVAR, out);
typeloc = out - stackblock();
USTPUTC(VSNORMAL, out);
subtype = VSNORMAL;
if (c == '{') {
bracketed_name = 1;
c = pgetc();
if (c == '#') {
if ((c = pgetc()) == '}')
c = '#';
else
subtype = VSLENGTH;
}
else
subtype = 0;
}
if (is_name(c)) {
do {
STPUTC(c, out);
c = pgetc();
} while (is_in_name(c));
} else if (is_digit(c)) {
if (bracketed_name) {
do {
STPUTC(c, out);
c = pgetc();
} while (is_digit(c));
} else {
STPUTC(c, out);
c = pgetc();
}
} else {
if (! is_special(c))
badsub: synerror("Bad substitution");
USTPUTC(c, out);
c = pgetc();
}
STPUTC('=', out);
flags = 0;
if (subtype == 0) {
switch (c) {
case ':':
flags = VSNUL;
c = pgetc();
/*FALLTHROUGH*/
default:
p = strchr(types, c);
if (p == NULL)
goto badsub;
subtype = p - types + VSNORMAL;
break;
case '%':
case '#':
{
int cc = c;
subtype = c == '#' ? VSTRIMLEFT :
VSTRIMRIGHT;
c = pgetc();
if (c == cc)
subtype++;
else
pungetc();
break;
}
}
} else {
pungetc();
}
if (subtype != VSLENGTH && (dblquote || arinest))
flags |= VSQUOTE;
*(stackblock() + typeloc) = subtype | flags;
if (subtype != VSNORMAL)
varnest++;
}
goto parsesub_return;
}
/*
* Called to parse command substitutions. Newstyle is set if the command
* is enclosed inside $(...); nlpp is a pointer to the head of the linked
* list of commands (passed by reference), and savelen is the number of
* characters on the top of the stack which must be preserved.
*/
parsebackq: {
struct nodelist **nlpp;
int savepbq;
union node *n;
char *volatile str;
struct jmploc jmploc;
struct jmploc *volatile savehandler;
int savelen;
int saveprompt;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &saveprompt;
#endif
savepbq = parsebackquote;
if (setjmp(jmploc.loc)) {
if (str)
ckfree(str);
parsebackquote = 0;
handler = savehandler;
longjmp(handler->loc, 1);
}
INTOFF;
str = NULL;
savelen = out - stackblock();
if (savelen > 0) {
str = ckmalloc(savelen);
memcpy(str, stackblock(), savelen);
}
savehandler = handler;
handler = &jmploc;
INTON;
if (oldstyle) {
/* We must read until the closing backquote, giving special
treatment to some slashes, and then push the string and
reread it as input, interpreting it normally. */
char *out;
int c;
int savelen;
char *str;
STARTSTACKSTR(out);
for (;;) {
if (needprompt) {
setprompt(2);
needprompt = 0;
}
switch (c = pgetc()) {
case '`':
goto done;
case '\\':
if ((c = pgetc()) == '\n') {
plinno++;
if (doprompt)
setprompt(2);
else
setprompt(0);
/*
* If eating a newline, avoid putting
* the newline into the new character
* stream (via the STPUTC after the
* switch).
*/
continue;
}
if (c != '\\' && c != '`' && c != '$'
&& (!dblquote || c != '"'))
STPUTC('\\', out);
break;
case '\n':
plinno++;
needprompt = doprompt;
break;
case PEOF:
startlinno = plinno;
synerror("EOF in backquote substitution");
break;
default:
break;
}
STPUTC(c, out);
}
done:
STPUTC('\0', out);
savelen = out - stackblock();
if (savelen > 0) {
str = ckmalloc(savelen);
memcpy(str, stackblock(), savelen);
setinputstring(str, 1);
}
}
nlpp = &bqlist;
while (*nlpp)
nlpp = &(*nlpp)->next;
*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
(*nlpp)->next = NULL;
parsebackquote = oldstyle;
if (oldstyle) {
saveprompt = doprompt;
doprompt = 0;
}
n = list(0);
if (oldstyle)
doprompt = saveprompt;
else {
if (readtoken() != TRP)
synexpect(TRP);
}
(*nlpp)->n = n;
if (oldstyle) {
/*
* Start reading from old file again, ignoring any pushed back
* tokens left from the backquote parsing
*/
popfile();
tokpushback = 0;
}
while (stackblocksize() <= savelen)
growstackblock();
STARTSTACKSTR(out);
if (str) {
memcpy(out, str, savelen);
STADJUST(savelen, out);
INTOFF;
ckfree(str);
str = NULL;
INTON;
}
parsebackquote = savepbq;
handler = savehandler;
if (arinest || dblquote)
USTPUTC(CTLBACKQ | CTLQUOTE, out);
else
USTPUTC(CTLBACKQ, out);
if (oldstyle)
goto parsebackq_oldreturn;
else
goto parsebackq_newreturn;
}
/*
* Parse an arithmetic expansion (indicate start of one and set state)
*/
parsearith: {
if (++arinest == 1) {
prevsyntax = syntax;
syntax = ARISYNTAX;
USTPUTC(CTLARI, out);
if (dblquote)
USTPUTC('"',out);
else
USTPUTC(' ',out);
} else {
/*
* we collapse embedded arithmetic expansion to
* parenthesis, which should be equivalent
*/
USTPUTC('(', out);
}
goto parsearith_return;
}
} /* end of readtoken */
/*
* 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;
}
/*
* Perform parameter expansion, command substitution and arithmetic
* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
* Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
* This is used to expand word in ${var+word} etc.
* If EXP_GLOB or EXP_CASE are set, keep and/or generate CTLESC
* characters to allow for further processing.
*
* If EXP_SPLIT is set, dst receives any complete words produced.
*/
static char *
argstr(char *p, int flag, struct worddest *dst)
{
char c;
int quotes = flag & (EXP_GLOB | EXP_CASE); /* do CTLESC */
int firsteq = 1;
int split_lit;
int lit_quoted;
split_lit = flag & EXP_SPLIT_LIT;
lit_quoted = flag & EXP_LIT_QUOTED;
flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
CHECKSTRSPACE(2, expdest);
switch (c = *p++) {
case '\0':
return (p - 1);
case CTLENDVAR:
case CTLENDARI:
return (p);
case CTLQUOTEMARK:
lit_quoted = 1;
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && (p[1] & VSQUOTE) != 0 &&
p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_SPLIT) != 0 && expdest == stackblock())
dst->state = WORD_QUOTEMARK;
break;
case CTLQUOTEEND:
lit_quoted = 0;
break;
case CTLESC:
c = *p++;
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
if (quotes)
USTPUTC(CTLESC, expdest);
USTPUTC(c, expdest);
break;
case CTLVAR:
p = evalvar(p, flag, dst);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c & CTLQUOTE, flag, dst);
argbackq = argbackq->next;
break;
case CTLARI:
p = expari(p, flag, dst);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
USTPUTC(c, expdest);
if (flag & EXP_VARTILDE && *p == '~' &&
(c != '=' || firsteq)) {
if (c == '=')
firsteq = 0;
p = exptilde(p, flag);
}
break;
default:
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
USTPUTC(c, expdest);
}
}
}
int
readcmd(int argc, char **argv)
{
char **ap;
char c;
int rflag;
char *prompt;
char *p;
int startloc;
int newloc;
int status;
int timeout;
int i;
fd_set set;
struct timeval ts, t0, t1, to;
ts.tv_sec = ts.tv_usec = 0;
rflag = 0;
timeout = 0;
prompt = NULL;
while ((i = nextopt("p:rt:")) != '\0') {
switch(i) {
case 'p':
prompt = optionarg;
break;
case 't':
p = strtotimeval(optionarg, &ts);
if (*p || (!ts.tv_sec && !ts.tv_usec))
sh_error("invalid timeout");
timeout = 1;
break;
case 'r':
rflag = 1;
break;
default:
break;
}
}
if (prompt && isatty(0)) {
out2str(prompt);
#ifdef FLUSHERR
flushall();
#endif
}
if (*(ap = argptr) == NULL)
sh_error("arg count");
status = 0;
if (timeout) {
gettimeofday(&t0, NULL);
/* ts += t0; */
ts.tv_usec += t0.tv_usec;
while (ts.tv_usec >= 1000000) {
ts.tv_sec++;
ts.tv_usec -= 1000000;
}
ts.tv_sec += t0.tv_sec;
}
STARTSTACKSTR(p);
goto start;
for (;;) {
if (timeout) {
gettimeofday(&t1, NULL);
if (t1.tv_sec > ts.tv_sec ||
(t1.tv_sec == ts.tv_sec &&
t1.tv_usec >= ts.tv_usec)) {
status = 1;
break; /* Timeout! */
}
/* to = ts - t1; */
if (ts.tv_usec >= t1.tv_usec) {
to.tv_usec = ts.tv_usec - t1.tv_usec;
to.tv_sec = ts.tv_sec - t1.tv_sec;
} else {
to.tv_usec = ts.tv_usec - t1.tv_usec + 1000000;
to.tv_sec = ts.tv_sec - t1.tv_sec - 1;
}
FD_ZERO(&set);
FD_SET(0, &set);
if (select(1, &set, NULL, NULL, &to) != 1) {
status = 1;
break; /* Timeout! */
}
}
switch (read(0, &c, 1)) {
case 1:
break;
default:
if (errno == EINTR && !pendingsigs)
continue;
/* fall through */
case 0:
status = 1;
goto out;
}
if (c == '\0')
continue;
if (newloc >= startloc) {
if (c == '\n')
goto resetbs;
goto put;
}
if (!rflag && c == '\\') {
newloc = p - (char *)stackblock();
continue;
}
if (c == '\n')
break;
put:
CHECKSTRSPACE(2, p);
if (strchr(qchars, c))
USTPUTC(CTLESC, p);
USTPUTC(c, p);
if (newloc >= startloc) {
resetbs:
recordregion(startloc, newloc, 0);
start:
startloc = p - (char *)stackblock();
newloc = startloc - 1;
}
}
out:
recordregion(startloc, p - (char *)stackblock(), 0);
STACKSTRNUL(p);
readcmd_handle_line(p + 1, ap);
return status;
}
