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lex.c
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/* $OpenBSD: lex.c,v 1.51 2015/09/10 22:48:58 nicm Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
* mirabilos <[email protected]>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.250 2018/10/20 18:34:14 tg Exp $");
/*
* states while lexing word
*/
#define SBASE 0 /* outside any lexical constructs */
#define SWORD 1 /* implicit quoting for substitute() */
#define SLETPAREN 2 /* inside (( )), implicit quoting */
#define SSQUOTE 3 /* inside '' */
#define SDQUOTE 4 /* inside "" */
#define SEQUOTE 5 /* inside $'' */
#define SBRACE 6 /* inside ${} */
#define SQBRACE 7 /* inside "${}" */
#define SBQUOTE 8 /* inside `` */
#define SASPAREN 9 /* inside $(( )) */
#define SHEREDELIM 10 /* parsing << or <<- delimiter */
#define SHEREDQUOTE 11 /* parsing " in << or <<- delimiter */
#define SPATTERN 12 /* parsing *(...|...) pattern (*+?@!) */
#define SADELIM 13 /* like SBASE, looking for delimiter */
#define STBRACEKORN 14 /* parsing ${...[#%]...} !FSH */
#define STBRACEBOURNE 15 /* parsing ${...[#%]...} FSH */
#define SINVALID 255 /* invalid state */
struct sretrace_info {
struct sretrace_info *next;
XString xs;
char *xp;
};
/*
* Structure to keep track of the lexing state and the various pieces of info
* needed for each particular state.
*/
typedef struct lex_state {
union {
/* point to the next state block */
struct lex_state *base;
/* marks start of state output in output string */
size_t start;
/* SBQUOTE: true if in double quotes: "`...`" */
/* SEQUOTE: got NUL, ignore rest of string */
bool abool;
/* SADELIM information */
struct {
/* character to search for */
unsigned char delimiter;
/* max. number of delimiters */
unsigned char num;
} adelim;
} u;
/* count open parentheses */
short nparen;
/* type of this state */
uint8_t type;
/* extra flags */
uint8_t ls_flags;
} Lex_state;
#define ls_base u.base
#define ls_start u.start
#define ls_bool u.abool
#define ls_adelim u.adelim
/* ls_flags */
#define LS_HEREDOC BIT(0)
typedef struct {
Lex_state *base;
Lex_state *end;
} State_info;
static void readhere(struct ioword *);
static void ungetsc(int);
static void ungetsc_i(int);
static int getsc_uu(void);
static void getsc_line(Source *);
static int getsc_bn(void);
static int getsc_i(void);
static char *get_brace_var(XString *, char *);
static bool arraysub(char **);
static void gethere(void);
static Lex_state *push_state_i(State_info *, Lex_state *);
static Lex_state *pop_state_i(State_info *, Lex_state *);
static int backslash_skip;
static int ignore_backslash_newline;
/* optimised getsc_bn() */
#define o_getsc() (*source->str != '\0' && *source->str != '\\' && \
!backslash_skip ? *source->str++ : getsc_bn())
/* optimised getsc_uu() */
#define o_getsc_u() ((*source->str != '\0') ? *source->str++ : getsc_uu())
/* retrace helper */
#define o_getsc_r(carg) \
int cev = (carg); \
struct sretrace_info *rp = retrace_info; \
\
while (rp) { \
Xcheck(rp->xs, rp->xp); \
*rp->xp++ = cev; \
rp = rp->next; \
} \
\
return (cev);
/* callback */
static int
getsc_i(void)
{
o_getsc_r((unsigned int)(unsigned char)o_getsc());
}
#if defined(MKSH_SMALL) && !defined(MKSH_SMALL_BUT_FAST)
#define getsc() getsc_i()
#else
static int getsc_r(int);
static int
getsc_r(int c)
{
o_getsc_r(c);
}
#define getsc() getsc_r((unsigned int)(unsigned char)o_getsc())
#endif
#define STATE_BSIZE 8
#define PUSH_STATE(s) do { \
uint8_t state_flags = statep->ls_flags; \
if (++statep == state_info.end) \
statep = push_state_i(&state_info, statep); \
state = statep->type = (s); \
statep->ls_flags = state_flags; \
} while (/* CONSTCOND */ 0)
#define POP_STATE() do { \
if (--statep == state_info.base) \
statep = pop_state_i(&state_info, statep); \
state = statep->type; \
} while (/* CONSTCOND */ 0)
#define PUSH_SRETRACE(s) do { \
struct sretrace_info *ri; \
\
PUSH_STATE(s); \
statep->ls_start = Xsavepos(ws, wp); \
ri = alloc(sizeof(struct sretrace_info), ATEMP); \
Xinit(ri->xs, ri->xp, 64, ATEMP); \
ri->next = retrace_info; \
retrace_info = ri; \
} while (/* CONSTCOND */ 0)
#define POP_SRETRACE() do { \
wp = Xrestpos(ws, wp, statep->ls_start); \
*retrace_info->xp = '\0'; \
sp = Xstring(retrace_info->xs, retrace_info->xp); \
dp = (void *)retrace_info; \
retrace_info = retrace_info->next; \
afree(dp, ATEMP); \
POP_STATE(); \
} while (/* CONSTCOND */ 0)
/**
* Lexical analyser
*
* tokens are not regular expressions, they are LL(1).
* for example, "${var:-${PWD}}", and "$(size $(whence ksh))".
* hence the state stack. Note "$(...)" are now parsed recursively.
*/
int
yylex(int cf)
{
Lex_state states[STATE_BSIZE], *statep, *s2, *base;
State_info state_info;
int c, c2, state;
size_t cz;
XString ws; /* expandable output word */
char *wp; /* output word pointer */
char *sp, *dp;
Again:
states[0].type = SINVALID;
states[0].ls_base = NULL;
statep = &states[1];
state_info.base = states;
state_info.end = &state_info.base[STATE_BSIZE];
Xinit(ws, wp, 64, ATEMP);
backslash_skip = 0;
ignore_backslash_newline = 0;
if (cf & ONEWORD)
state = SWORD;
else if (cf & LETEXPR) {
/* enclose arguments in (double) quotes */
*wp++ = OQUOTE;
state = SLETPAREN;
statep->nparen = 0;
} else {
/* normal lexing */
state = (cf & HEREDELIM) ? SHEREDELIM : SBASE;
do {
c = getsc();
} while (ctype(c, C_BLANK));
if (c == '#') {
ignore_backslash_newline++;
do {
c = getsc();
} while (!ctype(c, C_NUL | C_LF));
ignore_backslash_newline--;
}
ungetsc(c);
}
if (source->flags & SF_ALIAS) {
/* trailing ' ' in alias definition */
source->flags &= ~SF_ALIAS;
/* POSIX: trailing space only counts if parsing simple cmd */
if (!Flag(FPOSIX) || (cf & CMDWORD))
cf |= ALIAS;
}
/* Initial state: one of SWORD SLETPAREN SHEREDELIM SBASE */
statep->type = state;
statep->ls_flags = (cf & HEREDOC) ? LS_HEREDOC : 0;
/* collect non-special or quoted characters to form word */
while (!((c = getsc()) == 0 ||
((state == SBASE || state == SHEREDELIM) && ctype(c, C_LEX1)))) {
if (state == SBASE &&
subshell_nesting_type == ORD(/*{*/ '}') &&
(unsigned int)c == ORD(/*{*/ '}'))
/* possibly end ${ :;} */
break;
Xcheck(ws, wp);
switch (state) {
case SADELIM:
if ((unsigned int)c == ORD('('))
statep->nparen++;
else if ((unsigned int)c == ORD(')'))
statep->nparen--;
else if (statep->nparen == 0 &&
((unsigned int)c == ORD(/*{*/ '}') ||
c == (int)statep->ls_adelim.delimiter)) {
*wp++ = ADELIM;
*wp++ = c;
if ((unsigned int)c == ORD(/*{*/ '}') ||
--statep->ls_adelim.num == 0)
POP_STATE();
if ((unsigned int)c == ORD(/*{*/ '}'))
POP_STATE();
break;
}
/* FALLTHROUGH */
case SBASE:
if ((unsigned int)c == ORD('[') && (cf & CMDASN)) {
/* temporary */
*wp = EOS;
if (is_wdvarname(Xstring(ws, wp), false)) {
char *p, *tmp;
if (arraysub(&tmp)) {
*wp++ = CHAR;
*wp++ = c;
for (p = tmp; *p; ) {
Xcheck(ws, wp);
*wp++ = CHAR;
*wp++ = *p++;
}
afree(tmp, ATEMP);
break;
}
}
*wp++ = CHAR;
*wp++ = c;
break;
}
/* FALLTHROUGH */
Sbase1: /* includes *(...|...) pattern (*+?@!) */
if (ctype(c, C_PATMO)) {
c2 = getsc();
if ((unsigned int)c2 == ORD('(' /*)*/)) {
*wp++ = OPAT;
*wp++ = c;
PUSH_STATE(SPATTERN);
break;
}
ungetsc(c2);
}
/* FALLTHROUGH */
Sbase2: /* doesn't include *(...|...) pattern (*+?@!) */
switch (c) {
case ORD('\\'):
getsc_qchar:
if ((c = getsc())) {
/* trailing \ is lost */
*wp++ = QCHAR;
*wp++ = c;
}
break;
case ORD('\''):
open_ssquote_unless_heredoc:
if ((statep->ls_flags & LS_HEREDOC))
goto store_char;
*wp++ = OQUOTE;
ignore_backslash_newline++;
PUSH_STATE(SSQUOTE);
break;
case ORD('"'):
open_sdquote:
*wp++ = OQUOTE;
PUSH_STATE(SDQUOTE);
break;
case ORD('$'):
/*
* processing of dollar sign belongs into
* Subst, except for those which can open
* a string: $'…' and $"…"
*/
subst_dollar_ex:
c = getsc();
switch (c) {
case ORD('"'):
goto open_sdquote;
case ORD('\''):
goto open_sequote;
default:
goto SubstS;
}
default:
goto Subst;
}
break;
Subst:
switch (c) {
case ORD('\\'):
c = getsc();
switch (c) {
case ORD('"'):
if ((statep->ls_flags & LS_HEREDOC))
goto heredocquote;
/* FALLTHROUGH */
case ORD('\\'):
case ORD('$'):
case ORD('`'):
store_qchar:
*wp++ = QCHAR;
*wp++ = c;
break;
default:
heredocquote:
Xcheck(ws, wp);
if (c) {
/* trailing \ is lost */
*wp++ = CHAR;
*wp++ = '\\';
*wp++ = CHAR;
*wp++ = c;
}
break;
}
break;
case ORD('$'):
c = getsc();
SubstS:
if ((unsigned int)c == ORD('(' /*)*/)) {
c = getsc();
if ((unsigned int)c == ORD('(' /*)*/)) {
*wp++ = EXPRSUB;
PUSH_SRETRACE(SASPAREN);
/* unneeded? */
/*statep->ls_flags &= ~LS_HEREDOC;*/
statep->nparen = 2;
*retrace_info->xp++ = '(';
} else {
ungetsc(c);
subst_command:
c = COMSUB;
subst_command2:
sp = yyrecursive(c);
cz = strlen(sp) + 1;
XcheckN(ws, wp, cz);
*wp++ = c;
memcpy(wp, sp, cz);
wp += cz;
}
} else if ((unsigned int)c == ORD('{' /*}*/)) {
if ((unsigned int)(c = getsc()) == ORD('|')) {
/*
* non-subenvironment
* value substitution
*/
c = VALSUB;
goto subst_command2;
} else if (ctype(c, C_IFSWS)) {
/*
* non-subenvironment
* "command" substitution
*/
c = FUNSUB;
goto subst_command2;
}
ungetsc(c);
*wp++ = OSUBST;
*wp++ = '{' /*}*/;
wp = get_brace_var(&ws, wp);
c = getsc();
/* allow :# and :% (ksh88 compat) */
if ((unsigned int)c == ORD(':')) {
*wp++ = CHAR;
*wp++ = c;
c = getsc();
if ((unsigned int)c == ORD(':')) {
*wp++ = CHAR;
*wp++ = '0';
*wp++ = ADELIM;
*wp++ = ':';
PUSH_STATE(SBRACE);
/* perhaps unneeded? */
statep->ls_flags &= ~LS_HEREDOC;
PUSH_STATE(SADELIM);
statep->ls_adelim.delimiter = ':';
statep->ls_adelim.num = 1;
statep->nparen = 0;
break;
} else if (ctype(c, C_DIGIT | C_DOLAR | C_SPC) ||
/*XXX what else? */
c == '(' /*)*/) {
/* substring subst. */
if (c != ' ') {
*wp++ = CHAR;
*wp++ = ' ';
}
ungetsc(c);
PUSH_STATE(SBRACE);
/* perhaps unneeded? */
statep->ls_flags &= ~LS_HEREDOC;
PUSH_STATE(SADELIM);
statep->ls_adelim.delimiter = ':';
statep->ls_adelim.num = 2;
statep->nparen = 0;
break;
}
} else if (c == '/') {
c2 = ADELIM;
parse_adelim_slash:
*wp++ = CHAR;
*wp++ = c;
if ((unsigned int)(c = getsc()) == ORD('/')) {
*wp++ = c2;
*wp++ = c;
} else
ungetsc(c);
PUSH_STATE(SBRACE);
/* perhaps unneeded? */
statep->ls_flags &= ~LS_HEREDOC;
PUSH_STATE(SADELIM);
statep->ls_adelim.delimiter = '/';
statep->ls_adelim.num = 1;
statep->nparen = 0;
break;
} else if (c == '@') {
c2 = getsc();
ungetsc(c2);
if ((unsigned int)c2 == ORD('/')) {
c2 = CHAR;
goto parse_adelim_slash;
}
}
/*
* If this is a trim operation,
* treat (,|,) specially in STBRACE.
*/
if (ctype(c, C_SUB2)) {
ungetsc(c);
if (Flag(FSH))
PUSH_STATE(STBRACEBOURNE);
else
PUSH_STATE(STBRACEKORN);
/* single-quotes-in-heredoc-trim */
statep->ls_flags &= ~LS_HEREDOC;
} else {
ungetsc(c);
if (state == SDQUOTE ||
state == SQBRACE)
PUSH_STATE(SQBRACE);
else
PUSH_STATE(SBRACE);
/* here no LS_HEREDOC removal */
/* single-quotes-in-heredoc-braces */
}
} else if (ctype(c, C_ALPHX)) {
*wp++ = OSUBST;
*wp++ = 'X';
do {
Xcheck(ws, wp);
*wp++ = c;
c = getsc();
} while (ctype(c, C_ALNUX));
*wp++ = '\0';
*wp++ = CSUBST;
*wp++ = 'X';
ungetsc(c);
} else if (ctype(c, C_VAR1 | C_DIGIT)) {
Xcheck(ws, wp);
*wp++ = OSUBST;
*wp++ = 'X';
*wp++ = c;
*wp++ = '\0';
*wp++ = CSUBST;
*wp++ = 'X';
} else {
*wp++ = CHAR;
*wp++ = '$';
ungetsc(c);
}
break;
case ORD('`'):
subst_gravis:
PUSH_STATE(SBQUOTE);
*wp++ = COMASUB;
/*
* We need to know whether we are within double
* quotes in order to translate \" to " within
* "…`…\"…`…" because, unlike for COMSUBs, the
* outer double quoteing changes the backslash
* meaning for the inside. For more details:
* http://austingroupbugs.net/view.php?id=1015
*/
statep->ls_bool = false;
s2 = statep;
base = state_info.base;
while (/* CONSTCOND */ 1) {
for (; s2 != base; s2--) {
if (s2->type == SDQUOTE) {
statep->ls_bool = true;
break;
}
}
if (s2 != base)
break;
if (!(s2 = s2->ls_base))
break;
base = s2-- - STATE_BSIZE;
}
break;
case QCHAR:
if (cf & LQCHAR) {
*wp++ = QCHAR;
*wp++ = getsc();
break;
}
/* FALLTHROUGH */
default:
store_char:
*wp++ = CHAR;
*wp++ = c;
}
break;
case SEQUOTE:
if ((unsigned int)c == ORD('\'')) {
POP_STATE();
*wp++ = CQUOTE;
ignore_backslash_newline--;
} else if ((unsigned int)c == ORD('\\')) {
if ((c2 = unbksl(true, getsc_i, ungetsc)) == -1)
c2 = getsc();
if (c2 == 0)
statep->ls_bool = true;
if (!statep->ls_bool) {
char ts[4];
if ((unsigned int)c2 < 0x100) {
*wp++ = QCHAR;
*wp++ = c2;
} else {
cz = utf_wctomb(ts, c2 - 0x100);
ts[cz] = 0;
cz = 0;
do {
*wp++ = QCHAR;
*wp++ = ts[cz];
} while (ts[++cz]);
}
}
} else if (!statep->ls_bool) {
*wp++ = QCHAR;
*wp++ = c;
}
break;
case SSQUOTE:
if ((unsigned int)c == ORD('\'')) {
POP_STATE();
if ((statep->ls_flags & LS_HEREDOC) ||
state == SQBRACE)
goto store_char;
*wp++ = CQUOTE;
ignore_backslash_newline--;
} else {
*wp++ = QCHAR;
*wp++ = c;
}
break;
case SDQUOTE:
if ((unsigned int)c == ORD('"')) {
POP_STATE();
*wp++ = CQUOTE;
} else
goto Subst;
break;
/* $(( ... )) */
case SASPAREN:
if ((unsigned int)c == ORD('('))
statep->nparen++;
else if ((unsigned int)c == ORD(')')) {
statep->nparen--;
if (statep->nparen == 1) {
/* end of EXPRSUB */
POP_SRETRACE();
if ((unsigned int)(c2 = getsc()) == ORD(/*(*/ ')')) {
cz = strlen(sp) - 2;
XcheckN(ws, wp, cz);
memcpy(wp, sp + 1, cz);
wp += cz;
afree(sp, ATEMP);
*wp++ = '\0';
break;
} else {
Source *s;
ungetsc(c2);
/*
* mismatched parenthesis -
* assume we were really
* parsing a $(...) expression
*/
--wp;
s = pushs(SREREAD,
source->areap);
s->start = s->str =
s->u.freeme = sp;
s->next = source;
source = s;
goto subst_command;
}
}
}
/* reuse existing state machine */
goto Sbase2;
case SQBRACE:
if ((unsigned int)c == ORD('\\')) {
/*
* perform POSIX "quote removal" if the back-
* slash is "special", i.e. same cases as the
* {case '\\':} in Subst: plus closing brace;
* in mksh code "quote removal" on '\c' means
* write QCHAR+c, otherwise CHAR+\+CHAR+c are
* emitted (in heredocquote:)
*/
if ((unsigned int)(c = getsc()) == ORD('"') ||
(unsigned int)c == ORD('\\') ||
ctype(c, C_DOLAR | C_GRAVE) ||
(unsigned int)c == ORD(/*{*/ '}'))
goto store_qchar;
goto heredocquote;
}
goto common_SQBRACE;
case SBRACE:
if ((unsigned int)c == ORD('\''))
goto open_ssquote_unless_heredoc;
else if ((unsigned int)c == ORD('\\'))
goto getsc_qchar;
common_SQBRACE:
if ((unsigned int)c == ORD('"'))
goto open_sdquote;
else if ((unsigned int)c == ORD('$'))
goto subst_dollar_ex;
else if ((unsigned int)c == ORD('`'))
goto subst_gravis;
else if ((unsigned int)c != ORD(/*{*/ '}'))
goto store_char;
POP_STATE();
*wp++ = CSUBST;
*wp++ = /*{*/ '}';
break;
/* Same as SBASE, except (,|,) treated specially */
case STBRACEKORN:
if ((unsigned int)c == ORD('|'))
*wp++ = SPAT;
else if ((unsigned int)c == ORD('(')) {
*wp++ = OPAT;
/* simile for @ */
*wp++ = ' ';
PUSH_STATE(SPATTERN);
} else /* FALLTHROUGH */
case STBRACEBOURNE:
if ((unsigned int)c == ORD(/*{*/ '}')) {
POP_STATE();
*wp++ = CSUBST;
*wp++ = /*{*/ '}';
} else
goto Sbase1;
break;
case SBQUOTE:
if ((unsigned int)c == ORD('`')) {
*wp++ = 0;
POP_STATE();
} else if ((unsigned int)c == ORD('\\')) {
switch (c = getsc()) {
case 0:
/* trailing \ is lost */
break;
case ORD('$'):
case ORD('`'):
case ORD('\\'):
*wp++ = c;
break;
case ORD('"'):
if (statep->ls_bool) {
*wp++ = c;
break;
}
/* FALLTHROUGH */
default:
*wp++ = '\\';
*wp++ = c;
break;
}
} else
*wp++ = c;
break;
/* ONEWORD */
case SWORD:
goto Subst;
/* LETEXPR: (( ... )) */
case SLETPAREN:
if ((unsigned int)c == ORD(/*(*/ ')')) {
if (statep->nparen > 0)
--statep->nparen;
else if ((unsigned int)(c2 = getsc()) == ORD(/*(*/ ')')) {
c = 0;
*wp++ = CQUOTE;
goto Done;
} else {
Source *s;
ungetsc(c2);
ungetsc(c);
/*
* mismatched parenthesis -
* assume we were really
* parsing a (...) expression
*/
*wp = EOS;
sp = Xstring(ws, wp);
dp = wdstrip(sp + 1, WDS_TPUTS);
s = pushs(SREREAD, source->areap);
s->start = s->str = s->u.freeme = dp;
s->next = source;
source = s;
ungetsc('(' /*)*/);
return (ORD('(' /*)*/));
}
} else if ((unsigned int)c == ORD('('))
/*
* parentheses inside quotes and
* backslashes are lost, but AT&T ksh
* doesn't count them either
*/
++statep->nparen;
goto Sbase2;
/* << or <<- delimiter */
case SHEREDELIM:
/*
* here delimiters need a special case since
* $ and `...` are not to be treated specially
*/
switch (c) {
case ORD('\\'):
if ((c = getsc())) {
/* trailing \ is lost */
*wp++ = QCHAR;
*wp++ = c;
}
break;
case ORD('\''):
goto open_ssquote_unless_heredoc;
case ORD('$'):
if ((unsigned int)(c2 = getsc()) == ORD('\'')) {
open_sequote:
*wp++ = OQUOTE;
ignore_backslash_newline++;
PUSH_STATE(SEQUOTE);
statep->ls_bool = false;
break;
} else if ((unsigned int)c2 == ORD('"')) {
/* FALLTHROUGH */
case ORD('"'):
PUSH_SRETRACE(SHEREDQUOTE);
break;
}
ungetsc(c2);
/* FALLTHROUGH */
default:
*wp++ = CHAR;
*wp++ = c;
}
break;
/* " in << or <<- delimiter */
case SHEREDQUOTE:
if ((unsigned int)c != ORD('"'))
goto Subst;
POP_SRETRACE();
dp = strnul(sp) - 1;
/* remove the trailing double quote */
*dp = '\0';
/* store the quoted string */
*wp++ = OQUOTE;
XcheckN(ws, wp, (dp - sp) * 2);
dp = sp;
while ((c = *dp++)) {
if (c == '\\') {
switch ((c = *dp++)) {
case ORD('\\'):
case ORD('"'):
case ORD('$'):
case ORD('`'):
break;
default:
*wp++ = CHAR;
*wp++ = '\\';
break;
}
}
*wp++ = CHAR;
*wp++ = c;
}
afree(sp, ATEMP);
*wp++ = CQUOTE;
state = statep->type = SHEREDELIM;
break;
/* in *(...|...) pattern (*+?@!) */
case SPATTERN:
if ((unsigned int)c == ORD(/*(*/ ')')) {
*wp++ = CPAT;
POP_STATE();
} else if ((unsigned int)c == ORD('|')) {
*wp++ = SPAT;
} else if ((unsigned int)c == ORD('(')) {
*wp++ = OPAT;
/* simile for @ */
*wp++ = ' ';
PUSH_STATE(SPATTERN);
} else
goto Sbase1;
break;
}
}
Done:
Xcheck(ws, wp);
if (statep != &states[1])
/* XXX figure out what is missing */
yyerror("no closing quote");
/* This done to avoid tests for SHEREDELIM wherever SBASE tested */
if (state == SHEREDELIM)
state = SBASE;
dp = Xstring(ws, wp);
if (state == SBASE && (
(c == '&' && !Flag(FSH) && !Flag(FPOSIX)) ||
ctype(c, C_ANGLE)) && ((c2 = Xlength(ws, wp)) == 0 ||
(c2 == 2 && dp[0] == CHAR && ctype(dp[1], C_DIGIT)))) {
struct ioword *iop = alloc(sizeof(struct ioword), ATEMP);
iop->unit = c2 == 2 ? ksh_numdig(dp[1]) : c == '<' ? 0 : 1;
if (c == '&') {
if ((unsigned int)(c2 = getsc()) != ORD('>')) {
ungetsc(c2);
goto no_iop;
}
c = c2;
iop->ioflag = IOBASH;
} else
iop->ioflag = 0;
c2 = getsc();
/* <<, >>, <> are ok, >< is not */
if (c == c2 || ((unsigned int)c == ORD('<') &&
(unsigned int)c2 == ORD('>'))) {
iop->ioflag |= c == c2 ?
((unsigned int)c == ORD('>') ? IOCAT : IOHERE) : IORDWR;
if (iop->ioflag == IOHERE) {
if ((unsigned int)(c2 = getsc()) == ORD('-'))
iop->ioflag |= IOSKIP;
else if ((unsigned int)c2 == ORD('<'))
iop->ioflag |= IOHERESTR;
else
ungetsc(c2);
}
} else if ((unsigned int)c2 == ORD('&'))
iop->ioflag |= IODUP | ((unsigned int)c == ORD('<') ? IORDUP : 0);
else {
iop->ioflag |= (unsigned int)c == ORD('>') ? IOWRITE : IOREAD;
if ((unsigned int)c == ORD('>') && (unsigned int)c2 == ORD('|'))
iop->ioflag |= IOCLOB;
else
ungetsc(c2);
}
iop->ioname = NULL;
iop->delim = NULL;
iop->heredoc = NULL;
/* free word */
Xfree(ws, wp);
yylval.iop = iop;
return (REDIR);
no_iop:
afree(iop, ATEMP);
}
if (wp == dp && state == SBASE) {
/* free word */
Xfree(ws, wp);
/* no word, process LEX1 character */
if (((unsigned int)c == ORD('|')) ||
((unsigned int)c == ORD('&')) ||
((unsigned int)c == ORD(';')) ||
((unsigned int)c == ORD('(' /*)*/))) {
if ((c2 = getsc()) == c)
c = ((unsigned int)c == ORD(';')) ? BREAK :
((unsigned int)c == ORD('|')) ? LOGOR :
((unsigned int)c == ORD('&')) ? LOGAND :
/* (unsigned int)c == ORD('(' )) */ MDPAREN;
else if ((unsigned int)c == ORD('|') && (unsigned int)c2 == ORD('&'))
c = COPROC;
else if ((unsigned int)c == ORD(';') && (unsigned int)c2 == ORD('|'))
c = BRKEV;
else if ((unsigned int)c == ORD(';') && (unsigned int)c2 == ORD('&'))
c = BRKFT;
else
ungetsc(c2);
#ifndef MKSH_SMALL
if (c == BREAK) {
if ((unsigned int)(c2 = getsc()) == ORD('&'))
c = BRKEV;
else
ungetsc(c2);
}
#endif
} else if ((unsigned int)c == ORD('\n')) {
if (cf & HEREDELIM)
ungetsc(c);
else {
gethere();
if (cf & CONTIN)
goto Again;