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tree.c
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tree.c
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/* $OpenBSD: tree.c,v 1.21 2015/09/01 13:12:31 tedu Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2015, 2016, 2017, 2021
* mirabilos <m@mirbsd.org>
*
* 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/tree.c,v 1.114 2024/07/26 18:34:58 tg Exp $");
#define INDENT 8
static void ptree(struct op *, int, struct shf *);
static void pioact(struct shf *, struct ioword *);
static const char *wdvarput(struct shf *, const char *, int, int);
static void vfptreef(struct shf *, int, const char *, va_list);
static struct ioword **iocopy(struct ioword **, Area *);
static void iofree(struct ioword **, Area *);
/* "foo& ; bar" and "foo |& ; bar" are invalid */
static Wahr prevent_semicolon;
/* here document diversion */
static unsigned short ptree_nest;
static Wahr ptree_hashere;
static struct shf ptree_heredoc;
#define ptree_outhere(shf) do { \
if (ptree_hashere) { \
char *ptree_thehere; \
\
ptree_thehere = shf_sclose(&ptree_heredoc); \
shf_puts(ptree_thehere, (shf)); \
shf_putc('\n', (shf)); \
afree(ptree_thehere, ATEMP); \
ptree_hashere = Nee; \
/*prevent_semicolon = Ja;*/ \
} \
} while (/* CONSTCOND */ 0)
static const char Telif_pT[] = "elif %T";
/*
* print a command tree
*/
static void
ptree(struct op *t, int indent, struct shf *shf)
{
const char **w;
struct ioword **ioact;
struct op *t1;
int i;
const char *ccp;
Chain:
if (t == NULL)
return;
switch (t->type) {
case TCOM:
prevent_semicolon = Nee;
/* special-case 'var=<<EOF' (cf. exec.c:execute) */
if (t->args &&
/* we have zero arguments, i.e. no program to run */
t->args[0] == NULL &&
/* we have exactly one variable assignment */
t->vars[0] != NULL && t->vars[1] == NULL &&
/* we have exactly one I/O redirection */
t->ioact != NULL && t->ioact[0] != NULL &&
t->ioact[1] == NULL &&
/* of type "here document" (or "here string") */
(t->ioact[0]->ioflag & IOTYPE) == IOHERE &&
/* the variable assignment begins with a valid varname */
(ccp = skip_wdvarname(t->vars[0], Ja)) != t->vars[0] &&
/* and has no right-hand side (i.e. "varname=") */
ccp[0] == CHAR && ((ccp[1] == '=' && ccp[2] == EOS) ||
/* or "varname+=" */ (ccp[1] == '+' && ccp[2] == CHAR &&
ccp[3] == '=' && ccp[4] == EOS))) {
fptreef(shf, indent, Tf_S, t->vars[0]);
break;
}
if (t->vars) {
w = (const char **)t->vars;
while (*w)
fptreef(shf, indent, Tf_S_, *w++);
}
#ifndef MKSH_SMALL
else
shf_puts("#no-vars# ", shf);
#endif
if (t->args) {
w = t->args;
if (*w && **w == CHAR) {
char *cp = wdstrip(*w++, WDS_TPUTS);
if (valid_alias_name(cp))
shf_putc('\\', shf);
shf_puts(cp, shf);
shf_putc(' ', shf);
afree(cp, ATEMP);
}
while (*w)
fptreef(shf, indent, Tf_S_, *w++);
}
#ifndef MKSH_SMALL
else
shf_puts("#no-args# ", shf);
#endif
break;
case TEXEC:
t = t->left;
goto Chain;
case TPAREN:
fptreef(shf, indent + 2, "( %T) ", t->left);
break;
case TPIPE:
fptreef(shf, indent, "%T| ", t->left);
t = t->right;
goto Chain;
case TLIST:
fptreef(shf, indent, "%T%;", t->left);
t = t->right;
goto Chain;
case TOR:
case TAND:
fptreef(shf, indent, "%T%s %T",
t->left, (t->type == TOR) ? "||" : "&&", t->right);
break;
case TBANG:
shf_puts("! ", shf);
prevent_semicolon = Nee;
t = t->right;
goto Chain;
case TDBRACKET:
w = t->args;
shf_puts("[[", shf);
while (*w)
fptreef(shf, indent, Tf__S, *w++);
shf_puts(" ]] ", shf);
break;
case TSELECT:
case TFOR:
fptreef(shf, indent, "%s %s ",
(t->type == TFOR) ? "for" : Tselect, t->str);
if (t->vars != NULL) {
shf_puts("in ", shf);
w = (const char **)t->vars;
while (*w)
fptreef(shf, indent, Tf_S_, *w++);
fptreef(shf, indent, Tft_end);
}
fptreef(shf, indent + INDENT, "do%N%T", t->left);
fptreef(shf, indent, "%;done ");
break;
case TCASE:
fptreef(shf, indent, "case %S in", t->str);
for (t1 = t->left; t1 != NULL; t1 = t1->right) {
fptreef(shf, indent, "%N(");
w = (const char **)t1->vars;
while (*w) {
fptreef(shf, indent, "%S%c", *w,
(w[1] != NULL) ? '|' : ')');
++w;
}
fptreef(shf, indent + INDENT, "%N%T%N;%c", t1->left,
t1->u.charflag);
}
fptreef(shf, indent, "%Nesac ");
break;
case TELIF:
kerrf(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_ONEMSG | KWF_NOERRNO,
TELIF_unexpected);
/* FALLTHROUGH */
case TIF:
i = 2;
t1 = t;
goto process_TIF;
do {
t1 = t1->right;
i = 0;
fptreef(shf, indent, Tft_end);
process_TIF:
/* 5 == strlen("elif ") */
fptreef(shf, indent + 5 - i, Telif_pT + i, t1->left);
t1 = t1->right;
if (t1->left != NULL) {
fptreef(shf, indent, Tft_end);
fptreef(shf, indent + INDENT, "%s%N%T",
"then", t1->left);
}
} while (t1->right && t1->right->type == TELIF);
if (t1->right != NULL) {
fptreef(shf, indent, Tft_end);
fptreef(shf, indent + INDENT, "%s%N%T",
"else", t1->right);
}
fptreef(shf, indent, "%;fi ");
break;
case TWHILE:
case TUNTIL:
/* 6 == strlen("while "/"until ") */
fptreef(shf, indent + 6, Tf_s_T,
(t->type == TWHILE) ? "while" : "until",
t->left);
fptreef(shf, indent, Tft_end);
fptreef(shf, indent + INDENT, "do%N%T", t->right);
fptreef(shf, indent, "%;done ");
break;
case TBRACE:
fptreef(shf, indent + INDENT, "{%N%T", t->left);
fptreef(shf, indent, "%;} ");
break;
case TCOPROC:
fptreef(shf, indent, "%T|& ", t->left);
prevent_semicolon = Ja;
break;
case TASYNC:
fptreef(shf, indent, "%T& ", t->left);
prevent_semicolon = Ja;
break;
case TFUNCT:
fpFUNCTf(shf, indent, isWahr(t->u.ksh_func), t->str, t->left);
break;
case TTIME:
fptreef(shf, indent, Tf_s_T, Ttime, t->left);
break;
default:
shf_puts("<botch>", shf);
prevent_semicolon = Nee;
break;
}
if ((ioact = t->ioact) != NULL)
while (*ioact != NULL)
pioact(shf, *ioact++);
}
static void
pioact(struct shf *shf, struct ioword *iop)
{
unsigned short flag = iop->ioflag;
unsigned short type = flag & IOTYPE;
short expected;
expected = (type == IOREAD || type == IORDWR || type == IOHERE) ? 0 :
(type == IOCAT || type == IOWRITE) ? 1 :
(type == IODUP && (iop->unit == !(flag & IORDUP))) ? iop->unit :
iop->unit + 1;
if (iop->unit != expected)
shf_fprintf(shf, Tf_d, (int)iop->unit);
switch (type) {
case IOREAD:
shf_putc('<', shf);
break;
case IOHERE:
if (flag & IOHERESTR) {
shf_puts("<<<", shf);
goto ioheredelim;
}
shf_puts("<<", shf);
if (flag & IOSKIP)
shf_putc('-', shf);
if (iop->heredoc /* nil when tracing */) {
/* here document diversion */
if (!ptree_hashere) {
shf_sopen(NULL, 0, SHF_WR | SHF_DYNAMIC,
&ptree_heredoc);
ptree_hashere = Ja;
}
shf_putc('\n', &ptree_heredoc);
shf_puts(iop->heredoc, &ptree_heredoc);
/* iop->delim is set before iop->heredoc */
shf_putsv(evalstr(iop->delim, 0), &ptree_heredoc);
}
ioheredelim:
/* delim is NULL during syntax error printing */
if (iop->delim && !(iop->ioflag & IONDELIM))
wdvarput(shf, iop->delim, 0, WDS_TPUTS);
break;
case IOCAT:
shf_puts(">>", shf);
break;
case IOWRITE:
shf_putc('>', shf);
if (flag & IOCLOB)
shf_putc('|', shf);
break;
case IORDWR:
shf_puts("<>", shf);
break;
case IODUP:
shf_putc(flag & IORDUP ? '<' : '>', shf);
shf_putc('&', shf);
break;
}
/* name is NULL for IOHERE or when printing syntax errors */
if (iop->ioname) {
if (flag & IONAMEXP)
print_value_quoted(shf, iop->ioname);
else
wdvarput(shf, iop->ioname, 0, WDS_TPUTS);
}
shf_putc(' ', shf);
prevent_semicolon = Nee;
}
/* variant of fputs for ptreef and wdstrip */
static const char *
wdvarput(struct shf *shf, const char *wp, int quotelevel, int opmode)
{
int c;
const char *cs;
/*-
* problems:
* `...` -> $(...)
* 'foo' -> "foo"
* x${foo:-"hi"} -> x${foo:-hi} unless WDS_TPUTS
* x${foo:-'hi'} -> x${foo:-hi}
* could change encoding to:
* OQUOTE ["'] ... CQUOTE ["']
* COMSUB [(`] ...\0 (handle $ ` \ and maybe " in `...` case)
*/
while (/* CONSTCOND */ 1)
switch (*wp++) {
case EOS:
return (--wp);
case ADELIM:
if (ord(*wp) == ORD(/*{*/ '}')) {
++wp;
goto wdvarput_csubst;
}
/* FALLTHROUGH */
case CHAR:
c = ord(*wp++);
shf_putc(c, shf);
break;
case QCHAR:
c = ord(*wp++);
if (opmode & WDS_TPUTS)
switch (c) {
default:
if (quotelevel == 0)
/* FALLTHROUGH */
case ORD('"'):
case ORD('`'):
case ORD('$'):
case ORD('\\'):
shf_putc(ORD('\\'), shf);
break;
}
shf_putc(c, shf);
break;
case COMASUB:
case COMSUB:
shf_puts("$(", shf);
cs = ")";
if (ord(*wp) == ORD('(' /*)*/))
shf_putc(' ', shf);
pSUB:
while ((c = *wp++) != 0)
shf_putc(c, shf);
shf_puts(cs, shf);
break;
case FUNASUB:
case FUNSUB:
c = ORD(' ');
if (0)
/* FALLTHROUGH */
case VALSUB:
c = ORD('|');
shf_putc('$', shf);
shf_putc('{', shf);
shf_putc(c, shf);
cs = ";}";
goto pSUB;
case EXPRSUB:
shf_puts("$((", shf);
cs = "))";
goto pSUB;
case OQUOTE:
if (opmode & WDS_TPUTS) {
quotelevel++;
shf_putc('"', shf);
}
break;
case CQUOTE:
if (opmode & WDS_TPUTS) {
if (quotelevel)
quotelevel--;
shf_putc('"', shf);
}
break;
case OSUBST:
shf_putc('$', shf);
if (ord(*wp++) == ORD('{'))
shf_putc('{', shf);
while ((c = *wp++) != 0)
shf_putc(c, shf);
wp = wdvarput(shf, wp, 0, opmode);
break;
case CSUBST:
if (ord(*wp++) == ORD('}')) {
wdvarput_csubst:
shf_putc('}', shf);
}
return (wp);
case OPAT:
c = *wp++;
shf_putc(c, shf);
shf_putc('(', shf);
break;
case SPAT:
c = ORD('|');
if (0)
/* FALLTHROUGH */
case CPAT:
c = ORD(/*(*/ ')');
shf_putc(c, shf);
break;
}
}
/*
* this is the _only_ way to reliably handle
* variable args with an ANSI compiler
*/
/* VARARGS */
void
fptreef(struct shf *shf, int indent, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
vfptreef(shf, indent, fmt, va);
va_end(va);
}
/* VARARGS */
char *
snptreef(char *s, ssize_t n, const char *fmt, ...)
{
va_list va;
struct shf shf;
shf_sopen(s, n, SHF_WR | (s ? 0 : SHF_DYNAMIC), &shf);
va_start(va, fmt);
vfptreef(&shf, 0, fmt, va);
va_end(va);
/* shf_sclose NUL terminates */
return (shf_sclose(&shf));
}
static void
vfptreef(struct shf *shf, int indent, const char *fmt, va_list va)
{
int c;
if (!ptree_nest++)
ptree_hashere = Nee;
while ((c = ord(*fmt++))) {
if (c == '%') {
switch ((c = ord(*fmt++))) {
case ORD('s'):
/* string */
shf_putsv(va_arg(va, char *), shf);
break;
case ORD('S'):
/* word */
wdvarput(shf, va_arg(va, char *), 0, WDS_TPUTS);
break;
case ORD('d'):
/* signed decimal */
shf_fprintf(shf, Tf_d, va_arg(va, int));
break;
case ORD('u'):
/* unsigned decimal */
shf_fprintf(shf, "%u", va_arg(va, unsigned int));
break;
case ORD('T'):
/* format tree */
ptree(va_arg(va, struct op *), indent, shf);
goto dont_trash_prevent_semicolon;
case ORD(';'):
/* newline or ; */
case ORD('N'):
/* newline or space */
if (shf->flags & SHF_STRING) {
if ((unsigned int)c == ORD(';') &&
!prevent_semicolon)
shf_putc(';', shf);
shf_putc(' ', shf);
} else {
int i = indent;
ptree_outhere(shf);
shf_putc('\n', shf);
while (i >= 8) {
shf_putc('\t', shf);
i -= 8;
}
while (i--)
shf_putc(' ', shf);
}
break;
case ORD('R'):
/* I/O redirection */
pioact(shf, va_arg(va, struct ioword *));
break;
case ORD('c'):
/* character (octet, probably) */
c = va_arg(va, int);
/* FALLTHROUGH */
default:
shf_putc(c, shf);
break;
}
} else
shf_putc(c, shf);
prevent_semicolon = Nee;
dont_trash_prevent_semicolon:
;
}
if (!--ptree_nest)
ptree_outhere(shf);
}
/*
* copy tree (for function definition)
*/
struct op *
tcopy(struct op *t, Area *ap)
{
struct op *r;
const char **tw;
char **rw;
if (t == NULL)
return (NULL);
r = alloc(sizeof(struct op), ap);
r->type = t->type;
r->u.evalflags = t->u.evalflags;
if (t->type == TCASE)
r->str = wdcopy(t->str, ap);
else
strdupx(r->str, t->str, ap);
if (t->vars == NULL)
r->vars = NULL;
else {
tw = (const char **)t->vars;
while (*tw)
++tw;
rw = r->vars = alloc2(tw - (const char **)t->vars + 1,
sizeof(*tw), ap);
tw = (const char **)t->vars;
while (*tw)
*rw++ = wdcopy(*tw++, ap);
*rw = NULL;
}
if (t->args == NULL)
r->args = NULL;
else {
tw = t->args;
while (*tw)
++tw;
r->args = (const char **)(rw = alloc2(tw - t->args + 1,
sizeof(*tw), ap));
tw = t->args;
while (*tw)
*rw++ = wdcopy(*tw++, ap);
*rw = NULL;
}
r->ioact = (t->ioact == NULL) ? NULL : iocopy(t->ioact, ap);
r->left = tcopy(t->left, ap);
r->right = tcopy(t->right, ap);
r->lineno = t->lineno;
return (r);
}
char *
wdcopy(const char *wp, Area *ap)
{
size_t len;
len = wdscan(wp, EOS) - wp;
return (memcpy(alloc(len, ap), wp, len));
}
/* return the position of prefix c in wp plus 1 */
const char *
wdscan(const char *wp, int c)
{
int nest = 0;
while (/* CONSTCOND */ 1)
switch (*wp++) {
case EOS:
return (wp);
case ADELIM:
if (c == ADELIM && nest == 0)
return (wp + 1);
if (ord(*wp) == ORD(/*{*/ '}'))
goto wdscan_csubst;
/* FALLTHROUGH */
case CHAR:
case QCHAR:
wp++;
break;
case COMASUB:
case COMSUB:
case FUNASUB:
case FUNSUB:
case VALSUB:
case EXPRSUB:
while (*wp++ != 0)
;
break;
case OQUOTE:
case CQUOTE:
break;
case OSUBST:
nest++;
while (*wp++ != '\0')
;
break;
case CSUBST:
wdscan_csubst:
wp++;
if (c == CSUBST && nest == 0)
return (wp);
nest--;
break;
case OPAT:
nest++;
wp++;
break;
case SPAT:
case CPAT:
if (c == wp[-1] && nest == 0)
return (wp);
if (wp[-1] == CPAT)
nest--;
break;
default:
kwarnf0(KWF_INTERNAL | KWF_WARNING | KWF_NOERRNO,
"wdscan: unknown char 0x%X (carrying on)",
KBI(wp[-1]));
}
}
/*
* return a copy of wp without any of the mark up characters and with
* quote characters (" ' \) stripped. (string is allocated from ATEMP)
*/
char *
wdstrip(const char *wp, int opmode)
{
struct shf shf;
shf_sopen(NULL, 32, SHF_WR | SHF_DYNAMIC, &shf);
wdvarput(&shf, wp, 0, opmode);
/* shf_sclose NUL terminates */
return (shf_sclose(&shf));
}
static struct ioword **
iocopy(struct ioword **iow, Area *ap)
{
struct ioword **ior;
int i;
ior = iow;
while (*ior)
++ior;
ior = alloc2(ior - iow + 1, sizeof(struct ioword *), ap);
for (i = 0; iow[i] != NULL; i++) {
struct ioword *p, *q;
p = iow[i];
q = alloc(sizeof(struct ioword), ap);
ior[i] = q;
*q = *p;
if (p->ioname != NULL)
q->ioname = wdcopy(p->ioname, ap);
if (p->delim != NULL)
q->delim = wdcopy(p->delim, ap);
if (p->heredoc != NULL)
strdupx(q->heredoc, p->heredoc, ap);
}
ior[i] = NULL;
return (ior);
}
/*
* free tree (for function definition)
*/
void
tfree(struct op *t, Area *ap)
{
char **w;
if (t == NULL)
return;
afree(t->str, ap);
if (t->vars != NULL) {
for (w = t->vars; *w != NULL; w++)
afree(*w, ap);
afree(t->vars, ap);
}
if (t->args != NULL) {
/*XXX we assume the caller is right */
union mksh_ccphack cw;
cw.ro = t->args;
for (w = cw.rw; *w != NULL; w++)
afree(*w, ap);
afree(t->args, ap);
}
if (t->ioact != NULL)
iofree(t->ioact, ap);
tfree(t->left, ap);
tfree(t->right, ap);
afree(t, ap);
}
static void
iofree(struct ioword **iow, Area *ap)
{
struct ioword **iop;
struct ioword *p;
iop = iow;
while ((p = *iop++) != NULL) {
afree(p->ioname, ap);
afree(p->delim, ap);
afree(p->heredoc, ap);
afree(p, ap);
}
afree(iow, ap);
}
void
fpFUNCTf(struct shf *shf, int i, Wahr isksh, const char *k, struct op *v)
{
if (isksh)
fptreef(shf, i, "%s %s %T", Tfunction, k, v);
else if (ktsearch(&keywords, k, hash(k)))
fptreef(shf, i, "%s %s() %T", Tfunction, k, v);
else
fptreef(shf, i, "%s() %T", k, v);
}
void
uprntc(unsigned char c, struct shf *shf)
{
unsigned char a;
if (ctype(c, C_PRINT)) {
doprnt:
shf_putc(c, shf);
return;
}
if (!UTFMODE) {
if (!ksh_isctrl8(c))
goto doprnt;
if ((a = rtt2asc(c)) >= 0x80U) {
shf_scheck(3, shf);
shf_putc('^', shf);
shf_putc('!', shf);
a &= 0x7FU;
goto unctrl;
}
} else if ((a = rtt2asc(c)) >= 0x80U) {
shf_scheck(4, shf);
shf_putc('\\', shf);
shf_putc('x', shf);
shf_putc(digits_uc[(a >> 4) & 0x0F], shf);
shf_putc(digits_uc[a & 0x0F], shf);
return;
}
shf_scheck(2, shf);
shf_putc('^', shf);
unctrl:
shf_putc(asc2rtt(a ^ 0x40U), shf);
}
#ifndef MKSH_NO_CMDLINE_EDITING
/*
* For now, these are only used by the edit code, which requires
* a difference: tab is output as three spaces, not as control
* character in caret notation. If these will ever be used else‐
* where split them up.
*/
/*size_t*/ void
uescmbT(unsigned char *dst, const char **cpp)
{
unsigned char c;
unsigned int wc;
size_t n, dstsz = 0;
const char *cp = *cpp;
c = *cp++;
/* test cheap first (easiest) */
if (ctype(c, C_PRINT)) {
prntb:
dst[dstsz++] = c;
goto out;
}
/* differently from uprntc, note tab as three spaces */
if (ord(c) == CTRL_I) {
dst[dstsz++] = ' ';
dst[dstsz++] = ' ';
dst[dstsz++] = ' ';
goto out;
}
/* more specialised tests depend on shell state */
if (UTFMODE) {
/* wc = rtt2asc(c) except UTF-8 is decoded */
if ((n = utf_mbtowc(&wc, cp - 1)) == (size_t)-1) {
/* failed: invalid UTF-8 */
wc = rtt2asc(c);
dst[dstsz++] = '\\';
dst[dstsz++] = 'x';
dst[dstsz++] = digits_uc[(wc >> 4) & 0x0F];
dst[dstsz++] = digits_uc[wc & 0x0F];
goto out;
}
/*
* printable as-is? U+0020‥U+007E already handled
* above as they are C_PRINT, U+00A0 or higher are
* not escaped either, anything in between is special
*/
if (wc >= 0xA0U) {
dst[dstsz++] = c;
switch (n) {
#ifdef notyet
case 4:
dst[dstsz++] = *cp++;
/* FALLTHROUGH */
#endif
case 3:
dst[dstsz++] = *cp++;
/* FALLTHROUGH */
default:
dst[dstsz++] = *cp++;
break;
}
goto out;
}
/* and encoded with either 1 or 2 octets */
/* C1 control character, UTF-8 encoded */
if (wc >= 0x80U) {
/* n == 2 so we miss one out */
++cp;
c = '+';
goto prntC1;
}
/* nope, must be C0 or DEL */
/* n == 1 so cp needs no adjustment */
goto prntC0;
}
/* not UTFMODE allows more but the test is more expensive */
if (!ksh_isctrl8(c))
goto prntb;
/* UTF-8 is not decoded, we just transfer an octet to ASCII */
wc = rtt2asc(c);
/* C1 control character octet? */
if (wc >= 0x80U) {
c = '!';
prntC1:
dst[dstsz++] = '^';
dst[dstsz++] = c;
wc &= 0x7FU;
} else {
/* nope, so C0 or DEL, anything else went to prntb */
prntC0:
dst[dstsz++] = '^';
}
dst[dstsz++] = asc2rtt(wc ^ 0x40U);
out:
*cpp = cp;
dst[dstsz] = '\0';
#ifdef usedoutsideofedit
return (dstsz);
#endif
}
int
uwidthmbT(char *cp, char **dcp)
{
unsigned char c;
unsigned int wc;
int w;
size_t n;
c = *cp++;
/* test cheap first (easiest) */
if (ctype(c, C_PRINT)) {
prntb:
w = 1;
goto out;
}
/* differently from uprntc, note tab as three spaces */
if (ord(c) == CTRL_I) {
w = 3;
goto out;
}
/* more specialised tests depend on shell state */
if (UTFMODE) {
/* wc = rtt2asc(c) except UTF-8 is decoded */
if ((n = utf_mbtowc(&wc, cp - 1)) == (size_t)-1) {
/* \x## */
w = 4;
goto out;
}
cp += n - 1;
/*
* printable as-is? U+0020‥U+007E already handled
* above as they are C_PRINT, U+00A0 or higher are
* not escaped either, anything in between is special
*/
if (wc >= 0xA0U) {
w = utf_wcwidth(wc);
goto out;
}
/* and encoded with either 1 or 2 octets */
/* C1 control character, UTF-8 encoded */
if (wc >= 0x80U)
goto prntC1;
/* nope, must be C0 or DEL */
goto prntC0;
}
/* not UTFMODE allows more but the test is more expensive */
if (!ksh_isctrl8(c))
goto prntb;
/* UTF-8 is not decoded, we just transfer an octet to ASCII */
wc = rtt2asc(c);
/* C1 control character octet? */
if (wc >= 0x80U) {
prntC1:
w = 3;
} else {
/* nope, so C0 or DEL, anything else went to prntb */
prntC0:
w = 2;
}
out:
if (dcp)
*dcp = cp;
return (w);
}
#endif
const char *