mod_export char *
parse_subscript(char *s, int sub)
{
int l = strlen(s), err;
char *t;
if (!*s || *s == ']')
return 0;
lexsave();
untokenize(t = dupstring(s));
inpush(t, 0, NULL);
strinbeg(0);
len = 0;
bptr = tokstr = s;
bsiz = l + 1;
err = dquote_parse(']', sub);
if (err) {
err = *bptr;
*bptr = 0;
untokenize(s);
*bptr = err;
s = 0;
} else
s = bptr;
strinend();
inpop();
DPUTS(cmdsp, "BUG: parse_subscript: cmdstack not empty.");
lexrestore();
return s;
}
mod_export char *
parse_subscript(char *s, int sub, int endchar)
{
int l = strlen(s), err;
char *t;
if (!*s || *s == endchar)
return 0;
zcontext_save();
untokenize(t = dupstring(s));
inpush(t, 0, NULL);
strinbeg(0);
lexbuf.len = 0;
lexbuf.ptr = tokstr = s;
lexbuf.siz = l + 1;
err = dquote_parse(endchar, sub);
if (err) {
err = *lexbuf.ptr;
*lexbuf.ptr = '\0';
untokenize(s);
*lexbuf.ptr = err;
s = NULL;
} else {
s = lexbuf.ptr;
}
strinend();
inpop();
DPUTS(cmdsp, "BUG: parse_subscript: cmdstack not empty.");
zcontext_restore();
return s;
}
static int
checkalias(void)
{
Alias an;
if (!zshlextext)
return 0;
if (!noaliases && isset(ALIASESOPT) &&
(!isset(POSIXALIASES) ||
(tok == STRING && !reswdtab->getnode(reswdtab, zshlextext)))) {
char *suf;
an = (Alias) aliastab->getnode(aliastab, zshlextext);
if (an && !an->inuse &&
((an->node.flags & ALIAS_GLOBAL) ||
(incmdpos && tok == STRING) || inalmore)) {
if (!lexstop) {
/*
* Tokens that don't require a space after, get one,
* because they are treated as if preceded by one.
*/
int c = hgetc();
hungetc(c);
if (!iblank(c))
inpush(" ", INP_ALIAS, 0);
}
inpush(an->text, INP_ALIAS, an);
if (an->text[0] == ' ' && !(an->node.flags & ALIAS_GLOBAL))
aliasspaceflag = 1;
lexstop = 0;
return 1;
}
if ((suf = strrchr(zshlextext, '.')) && suf[1] &&
suf > zshlextext && suf[-1] != Meta &&
(an = (Alias)sufaliastab->getnode(sufaliastab, suf+1)) &&
!an->inuse && incmdpos) {
inpush(dupstring(zshlextext), INP_ALIAS, NULL);
inpush(" ", INP_ALIAS, NULL);
inpush(an->text, INP_ALIAS, an);
lexstop = 0;
return 1;
}
}
return 0;
}
void
inungetc(int c)
{
if (!lexstop) {
if (inbufptr != inbuf) {
#ifdef DEBUG
/* Just for debugging: enable only if foul play suspected. */
if (inbufptr[-1] != (char) c)
fprintf(stderr, "Warning: backing up wrong character.\n");
#endif
/* Just decrement the pointer: if it's not the same
* character being pushed back, we're in trouble anyway.
*/
inbufptr--;
inbufct++;
inbufleft++;
if (((inbufflags & INP_LINENO) || !strin) && c == '\n')
lineno--;
}
#ifdef DEBUG
else if (!(inbufflags & INP_CONT)) {
/* Just for debugging */
fprintf(stderr, "Attempt to inungetc() at start of input.\n");
}
#endif
else {
/*
* The character is being backed up from a previous input stack
* layer. However, there was an expansion in the middle, so we
* can't back up where we want to. Instead, we just push it
* onto the input stack as an extra character.
*/
char *cback = (char *)zshcalloc(2);
cback[0] = (char) c;
inpush(cback, INP_FREE|INP_CONT, NULL);
}
/* If we are back at the start of a segment,
* we may need to restore an alias popped from the stack.
* Note this may be a dummy (history expansion) entry.
*/
if (inbufptr == inbufpush && inbufflags & INP_ALCONT) {
/*
* Go back up the stack over all entries which were alias
* expansions and were pushed with nothing remaining to read.
*/
do {
if (instacktop->alias)
instacktop->alias->inuse = 1;
instacktop++;
} while ((instacktop->flags & INP_ALCONT) && !instacktop->bufleft);
inbufflags = INP_CONT|INP_ALIAS;
inbufleft = 0;
inbuf = inbufptr = "";
}
}
}
mod_export char *
parse_subscript(char *s, int sub, int endchar)
{
int l = strlen(s), err, toklen;
char *t;
if (!*s || *s == endchar)
return 0;
zcontext_save();
untokenize(t = dupstring(s));
inpush(t, 0, NULL);
strinbeg(0);
/*
* Warning to Future Generations:
*
* This way of passing the subscript through the lexer is brittle.
* Code above this for several layers assumes that when we tokenise
* the input it goes into the same place as the original string.
* However, the lexer may overwrite later bits of the string or
* reallocate it, in particular when expanding aliaes. To get
* around this, we copy the string and then copy it back. This is a
* bit more robust but still relies on the underlying assumption of
* length preservation.
*/
lexbuf.len = 0;
lexbuf.ptr = tokstr = dupstring(s);
lexbuf.siz = l + 1;
err = dquote_parse(endchar, sub);
toklen = (int)(lexbuf.ptr - tokstr);
DPUTS(toklen > l, "Bad length for parsed subscript");
memcpy(s, tokstr, toklen);
if (err) {
char *strend = s + toklen;
err = *strend;
*strend = '\0';
untokenize(s);
*strend = err;
s = NULL;
} else {
s += toklen;
}
strinend();
inpop();
DPUTS(cmdsp, "BUG: parse_subscript: cmdstack not empty.");
zcontext_restore();
return s;
}
mod_export int
parsestrnoerr(char *s)
{
int l = strlen(s), err;
lexsave();
untokenize(s);
inpush(dupstring(s), 0, NULL);
strinbeg(0);
len = 0;
bptr = tokstr = s;
bsiz = l + 1;
err = dquote_parse('\0', 1);
*bptr = '\0';
strinend();
inpop();
DPUTS(cmdsp, "BUG: parsestr: cmdstack not empty.");
lexrestore();
return err;
}
mod_export int
parsestrnoerr(char **s)
{
int l = strlen(*s), err;
zcontext_save();
untokenize(*s);
inpush(dupstring(*s), 0, NULL);
strinbeg(0);
lexbuf.len = 0;
lexbuf.ptr = tokstr = *s;
lexbuf.siz = l + 1;
err = dquote_parse('\0', 1);
if (tokstr)
*s = tokstr;
*lexbuf.ptr = '\0';
strinend();
inpop();
DPUTS(cmdsp, "BUG: parsestr: cmdstack not empty.");
zcontext_restore();
return err;
}
mod_export int
parse_subst_string(char *s)
{
int c, l = strlen(s), err, olen, lexstop_ret;
if (!*s || !strcmp(s, nulstring))
return 0;
lexsave();
untokenize(s);
inpush(dupstring(s), 0, NULL);
strinbeg(0);
len = 0;
bptr = tokstr = s;
bsiz = l + 1;
c = hgetc();
lexstop_ret = lexstop;
c = gettokstr(c, 1);
err = errflag;
strinend();
inpop();
DPUTS(cmdsp, "BUG: parse_subst_string: cmdstack not empty.");
olen = len;
lexrestore();
errflag = err;
if (c == LEXERR) {
untokenize(s);
return 1;
}
#ifdef DEBUG
if (c != STRING || olen != l || errflag) {
fprintf(stderr, "Oops. Bug in parse_subst_string: %s\n",
olen < l ? "len < l" : errflag ? "errflag" : "c != STRING");
fflush(stderr);
untokenize(s);
return 1;
}
#endif
return 0;
}
mod_export int
parse_subst_string(char *s)
{
int c, l = strlen(s), err;
char *ptr;
enum lextok ctok;
if (!*s || !strcmp(s, nulstring))
return 0;
zcontext_save();
untokenize(s);
inpush(dupstring(s), 0, NULL);
strinbeg(0);
lexbuf.len = 0;
lexbuf.ptr = tokstr = s;
lexbuf.siz = l + 1;
c = hgetc();
ctok = gettokstr(c, 1);
err = errflag;
strinend();
inpop();
DPUTS(cmdsp, "BUG: parse_subst_string: cmdstack not empty.");
zcontext_restore();
/* Keep any interrupt error status */
errflag = err | (errflag & ERRFLAG_INT);
if (ctok == LEXERR) {
untokenize(s);
return 1;
}
#ifdef DEBUG
/*
* Historical note: we used to check here for olen (the value of lexbuf.len
* before zcontext_restore()) == l, but that's not necessarily the case if
* we stripped an RCQUOTE.
*/
if (ctok != STRING || (errflag && !noerrs)) {
fprintf(stderr, "Oops. Bug in parse_subst_string: %s\n",
errflag ? "errflag" : "ctok != STRING");
fflush(stderr);
untokenize(s);
return 1;
}
#endif
/* Check for $'...' quoting. This needs special handling. */
for (ptr = s; *ptr; )
{
if (*ptr == String && ptr[1] == Snull)
{
char *t;
int len, tlen, diff;
t = getkeystring(ptr + 2, &len, GETKEYS_DOLLARS_QUOTE, NULL);
len += 2;
tlen = strlen(t);
diff = len - tlen;
/*
* Yuk.
* parse_subst_string() currently handles strings in-place.
* That's not so easy to fix without knowing whether
* additional memory should come off the heap or
* otherwise. So we cheat by copying the unquoted string
* into place, unless it's too long. That's not the
* normal case, but I'm worried there are pathological
* cases with converting metafied multibyte strings.
* If someone can prove there aren't I will be very happy.
*/
if (diff < 0) {
DPUTS(1, "$'...' subst too long: fix get_parse_string()");
return 1;
}
memcpy(ptr, t, tlen);
ptr += tlen;
if (diff > 0) {
char *dptr = ptr;
char *sptr = ptr + diff;
while ((*dptr++ = *sptr++))
;
}
} else
ptr++;
}
return 0;
}
int
exalias(void)
{
Alias an;
Reswd rw;
hwend();
if (interact && isset(SHINSTDIN) && !strin && !incasepat &&
tok == STRING && !nocorrect && !(inbufflags & INP_ALIAS) &&
(isset(CORRECTALL) || (isset(CORRECT) && incmdpos)))
spckword(&tokstr, 1, incmdpos, 1);
if (!tokstr) {
yytext = tokstrings[tok];
return 0;
} else {
VARARR(char, copy, (strlen(tokstr) + 1));
if (has_token(tokstr)) {
char *p, *t;
yytext = p = copy;
for (t = tokstr;
(*p++ = itok(*t) ? ztokens[*t++ - Pound] : *t++););
} else
yytext = tokstr;
if (zleparse && !(inbufflags & INP_ALIAS)) {
int zp = zleparse;
gotword();
if (zp == 1 && !zleparse) {
if (yytext == copy)
yytext = tokstr;
return 0;
}
}
if (tok == STRING) {
/* Check for an alias */
if (!noaliases && isset(ALIASESOPT)) {
char *suf;
an = (Alias) aliastab->getnode(aliastab, yytext);
if (an && !an->inuse &&
((an->flags & ALIAS_GLOBAL) || incmdpos || inalmore)) {
inpush(an->text, INP_ALIAS, an);
if (an->text[0] == ' ')
aliasspaceflag = 1;
lexstop = 0;
if (yytext == copy)
yytext = tokstr;
return 1;
}
if ((suf = strrchr(yytext, '.')) && suf[1] &&
suf > yytext && suf[-1] != Meta &&
(an = (Alias)sufaliastab->getnode(sufaliastab, suf+1)) &&
!an->inuse && incmdpos) {
inpush(dupstring(yytext), INP_ALIAS, NULL);
inpush(" ", INP_ALIAS, NULL);
inpush(an->text, INP_ALIAS, an);
lexstop = 0;
if (yytext == copy)
yytext = tokstr;
return 1;
}
}
/* Then check for a reserved word */
if ((incmdpos ||
(unset(IGNOREBRACES) && yytext[0] == '}' && !yytext[1])) &&
(rw = (Reswd) reswdtab->getnode(reswdtab, yytext))) {
tok = rw->token;
if (tok == DINBRACK)
incond = 1;
} else if (incond && !strcmp(yytext, "]]")) {
tok = DOUTBRACK;
incond = 0;
} else if (incond == 1 && yytext[0] == '!' && !yytext[1])
tok = BANG;
}
inalmore = 0;
if (yytext == copy)
yytext = tokstr;
}
return 0;
}
