mksh/tree.c

718 lines
15 KiB
C

/* $OpenBSD: tree.c,v 1.19 2008/08/11 21:50:35 jaredy Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009
* Thorsten Glaser <tg@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 1.26 2009/05/16 16:59:41 tg Exp $");
#define INDENT 4
#define tputc(c, shf) shf_putchar(c, shf);
static void ptree(struct op *, int, struct shf *);
static void pioact(struct shf *, int, struct ioword *);
static void tputC(int, struct shf *);
static void tputS(char *, struct shf *);
static void vfptreef(struct shf *, int, const char *, va_list);
static struct ioword **iocopy(struct ioword **, Area *);
static void iofree(struct ioword **, Area *);
/*
* print a command tree
*/
static void
ptree(struct op *t, int indent, struct shf *shf)
{
const char **w;
struct ioword **ioact;
struct op *t1;
Chain:
if (t == NULL)
return;
switch (t->type) {
case TCOM:
if (t->vars)
for (w = (const char **)t->vars; *w != NULL; )
fptreef(shf, indent, "%S ", *w++);
else
shf_puts("#no-vars# ", shf);
if (t->args)
for (w = t->args; *w != NULL; )
fptreef(shf, indent, "%S ", *w++);
else
shf_puts("#no-args# ", shf);
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);
t = t->right;
goto Chain;
case TDBRACKET:
{
int i;
shf_puts("[[", shf);
for (i = 0; t->args[i]; i++)
fptreef(shf, indent, " %S", t->args[i]);
shf_puts(" ]] ", shf);
break;
}
case TSELECT:
fptreef(shf, indent, "select %s ", t->str);
/* FALLTHRU */
case TFOR:
if (t->type == TFOR)
fptreef(shf, indent, "for %s ", t->str);
if (t->vars != NULL) {
shf_puts("in ", shf);
for (w = (const char **)t->vars; *w; )
fptreef(shf, indent, "%S ", *w++);
fptreef(shf, indent, "%;");
}
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(");
for (w = (const char **)t1->vars; *w != NULL; w++)
fptreef(shf, indent, "%S%c", *w,
(w[1] != NULL) ? '|' : ')');
fptreef(shf, indent + INDENT, "%;%T%N;;", t1->left);
}
fptreef(shf, indent, "%Nesac ");
break;
case TIF:
case TELIF:
/* 3 == strlen("if ") */
fptreef(shf, indent + 3, "if %T", t->left);
for (;;) {
t = t->right;
if (t->left != NULL) {
fptreef(shf, indent, "%;");
fptreef(shf, indent + INDENT, "then%N%T",
t->left);
}
if (t->right == NULL || t->right->type != TELIF)
break;
t = t->right;
fptreef(shf, indent, "%;");
/* 5 == strlen("elif ") */
fptreef(shf, indent + 5, "elif %T", t->left);
}
if (t->right != NULL) {
fptreef(shf, indent, "%;");
fptreef(shf, indent + INDENT, "else%;%T", t->right);
}
fptreef(shf, indent, "%;fi ");
break;
case TWHILE:
case TUNTIL:
/* 6 == strlen("while"/"until") */
fptreef(shf, indent + 6, "%s %T",
(t->type==TWHILE) ? "while" : "until",
t->left);
fptreef(shf, indent, "%;do");
fptreef(shf, indent + INDENT, "%;%T", t->right);
fptreef(shf, indent, "%;done ");
break;
case TBRACE:
fptreef(shf, indent + INDENT, "{%;%T", t->left);
fptreef(shf, indent, "%;} ");
break;
case TCOPROC:
fptreef(shf, indent, "%T|& ", t->left);
break;
case TASYNC:
fptreef(shf, indent, "%T& ", t->left);
break;
case TFUNCT:
fptreef(shf, indent,
t->u.ksh_func ? "function %s %T" : "%s() %T",
t->str, t->left);
break;
case TTIME:
fptreef(shf, indent, "time %T", t->left);
break;
default:
shf_puts("<botch>", shf);
break;
}
if ((ioact = t->ioact) != NULL) {
int need_nl = 0;
while (*ioact != NULL)
pioact(shf, indent, *ioact++);
/* Print here documents after everything else... */
for (ioact = t->ioact; *ioact != NULL; ) {
struct ioword *iop = *ioact++;
/* heredoc is 0 when tracing (set -x) */
if ((iop->flag & IOTYPE) == IOHERE && iop->heredoc &&
/* iop->delim[1] == '<' means here string */
(!iop->delim || iop->delim[1] != '<')) {
tputc('\n', shf);
shf_puts(iop->heredoc, shf);
fptreef(shf, indent, "%s",
evalstr(iop->delim, 0));
need_nl = 1;
}
}
/* Last delimiter must be followed by a newline (this often
* leads to an extra blank line, but its not worth worrying
* about)
*/
if (need_nl)
tputc('\n', shf);
}
}
static void
pioact(struct shf *shf, int indent, struct ioword *iop)
{
int flag = iop->flag;
int type = flag & IOTYPE;
int 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, "%d", iop->unit);
switch (type) {
case IOREAD:
shf_puts("< ", shf);
break;
case IOHERE:
shf_puts(flag & IOSKIP ? "<<-" : "<<", shf);
break;
case IOCAT:
shf_puts(">> ", shf);
break;
case IOWRITE:
shf_puts(flag & IOCLOB ? ">| " : "> ", shf);
break;
case IORDWR:
shf_puts("<> ", shf);
break;
case IODUP:
shf_puts(flag & IORDUP ? "<&" : ">&", shf);
break;
}
/* name/delim are 0 when printing syntax errors */
if (type == IOHERE) {
if (iop->delim)
fptreef(shf, indent, "%s%S ",
/* here string */ iop->delim[1] == '<' ? "" : " ",
iop->delim);
else
tputc(' ', shf);
} else if (iop->name)
fptreef(shf, indent, (iop->flag & IONAMEXP) ? "%s " : "%S ",
iop->name);
}
/*
* variants of fputc, fputs for ptreef and snptreef
*/
static void
tputC(int c, struct shf *shf)
{
if ((c&0x60) == 0) { /* C0|C1 */
tputc((c&0x80) ? '$' : '^', shf);
tputc(((c&0x7F)|0x40), shf);
} else if ((c&0x7F) == 0x7F) { /* DEL */
tputc((c&0x80) ? '$' : '^', shf);
tputc('?', shf);
} else
tputc(c, shf);
}
static void
tputS(char *wp, struct shf *shf)
{
int c;
bool quoted = false;
/* problems:
* `...` -> $(...)
* 'foo' -> "foo"
* could change encoding to:
* OQUOTE ["'] ... CQUOTE ["']
* COMSUB [(`] ...\0 (handle $ ` \ and maybe " in `...` case)
*/
while (1)
switch (*wp++) {
case EOS:
return;
case ADELIM:
case CHAR:
tputC(*wp++, shf);
break;
case QCHAR:
c = *wp++;
if (!quoted || (c == '"' || c == '`' || c == '$'))
tputc('\\', shf);
tputC(c, shf);
break;
case COMSUB:
shf_puts("$(", shf);
while (*wp != 0)
tputC(*wp++, shf);
tputc(')', shf);
wp++;
break;
case EXPRSUB:
shf_puts("$((", shf);
while (*wp != 0)
tputC(*wp++, shf);
shf_puts("))", shf);
wp++;
break;
case OQUOTE:
quoted = true;
tputc('"', shf);
break;
case CQUOTE:
quoted = false;
tputc('"', shf);
break;
case OSUBST:
tputc('$', shf);
if (*wp++ == '{')
tputc('{', shf);
while ((c = *wp++) != 0)
tputC(c, shf);
break;
case CSUBST:
if (*wp++ == '}')
tputc('}', shf);
break;
case OPAT:
tputc(*wp++, shf);
tputc('(', shf);
break;
case SPAT:
tputc('|', shf);
break;
case CPAT:
tputc(')', shf);
break;
}
}
/*
* this is the _only_ way to reliably handle
* variable args with an ANSI compiler
*/
/* VARARGS */
int
fptreef(struct shf *shf, int indent, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
vfptreef(shf, indent, fmt, va);
va_end(va);
return (0);
}
/* VARARGS */
char *
snptreef(char *s, int 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);
return (shf_sclose(&shf)); /* null terminates */
}
static void
vfptreef(struct shf *shf, int indent, const char *fmt, va_list va)
{
int c;
while ((c = *fmt++)) {
if (c == '%') {
switch ((c = *fmt++)) {
case 'c':
tputc(va_arg(va, int), shf);
break;
case 's':
shf_puts(va_arg(va, char *), shf);
break;
case 'S': /* word */
tputS(va_arg(va, char *), shf);
break;
case 'd': /* decimal */
shf_fprintf(shf, "%d", va_arg(va, int));
break;
case 'u': /* decimal */
shf_fprintf(shf, "%u", va_arg(va, unsigned int));
break;
case 'T': /* format tree */
ptree(va_arg(va, struct op *), indent, shf);
break;
case ';': /* newline or ; */
case 'N': /* newline or space */
if (shf->flags & SHF_STRING) {
if (c == ';')
tputc(';', shf);
tputc(' ', shf);
} else {
int i;
tputc('\n', shf);
for (i = indent; i >= 8; i -= 8)
tputc('\t', shf);
for (; i > 0; --i)
tputc(' ', shf);
}
break;
case 'R':
pioact(shf, indent, va_arg(va, struct ioword *));
break;
default:
tputc(c, shf);
break;
}
} else
tputc(c, 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 {
for (tw = (const char **)t->vars; *tw++ != NULL; )
;
rw = r->vars = alloc((tw - (const char **)t->vars + 1) *
sizeof (*tw), ap);
for (tw = (const char **)t->vars; *tw != NULL; )
*rw++ = wdcopy(*tw++, ap);
*rw = NULL;
}
if (t->args == NULL)
r->args = NULL;
else {
for (tw = t->args; *tw++ != NULL; )
;
r->args = (const char **)(rw = alloc((tw - t->args + 1) *
sizeof (*tw), ap));
for (tw = t->args; *tw != NULL; )
*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 = 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 (1)
switch (*wp++) {
case EOS:
return (wp);
case ADELIM:
if (c == ADELIM)
return (wp + 1);
/* FALLTHROUGH */
case CHAR:
case QCHAR:
wp++;
break;
case COMSUB:
case EXPRSUB:
while (*wp++ != 0)
;
break;
case OQUOTE:
case CQUOTE:
break;
case OSUBST:
nest++;
while (*wp++ != '\0')
;
break;
case 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:
internal_warningf(
"wdscan: unknown char 0x%x (carrying on)",
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, bool keepq, bool make_magic)
{
struct shf shf;
int c;
shf_sopen(NULL, 32, SHF_WR | SHF_DYNAMIC, &shf);
/* problems:
* `...` -> $(...)
* x${foo:-"hi"} -> x${foo:-hi}
* x${foo:-'hi'} -> x${foo:-hi} unless keepq
*/
while (1)
switch (*wp++) {
case EOS:
return shf_sclose(&shf); /* null terminates */
case ADELIM:
case CHAR:
c = *wp++;
if (make_magic && (ISMAGIC(c) || c == '[' || c == NOT ||
c == '-' || c == ']' || c == '*' || c == '?'))
shf_putchar(MAGIC, &shf);
shf_putchar(c, &shf);
break;
case QCHAR:
c = *wp++;
if (keepq && (c == '"' || c == '`' || c == '$' || c == '\\'))
shf_putchar('\\', &shf);
shf_putchar(c, &shf);
break;
case COMSUB:
shf_puts("$(", &shf);
while (*wp != 0)
shf_putchar(*wp++, &shf);
shf_putchar(')', &shf);
break;
case EXPRSUB:
shf_puts("$((", &shf);
while (*wp != 0)
shf_putchar(*wp++, &shf);
shf_puts("))", &shf);
break;
case OQUOTE:
break;
case CQUOTE:
break;
case OSUBST:
shf_putchar('$', &shf);
if (*wp++ == '{')
shf_putchar('{', &shf);
while ((c = *wp++) != 0)
shf_putchar(c, &shf);
break;
case CSUBST:
if (*wp++ == '}')
shf_putchar('}', &shf);
break;
case OPAT:
if (make_magic) {
shf_putchar(MAGIC, &shf);
shf_putchar(*wp++ | 0x80, &shf);
} else {
shf_putchar(*wp++, &shf);
shf_putchar('(', &shf);
}
break;
case SPAT:
if (make_magic)
shf_putchar(MAGIC, &shf);
shf_putchar('|', &shf);
break;
case CPAT:
if (make_magic)
shf_putchar(MAGIC, &shf);
shf_putchar(')', &shf);
break;
}
}
static struct ioword **
iocopy(struct ioword **iow, Area *ap)
{
struct ioword **ior;
int i;
for (ior = iow; *ior++ != NULL; )
;
ior = alloc((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->name != NULL)
q->name = wdcopy(p->name, 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;
if (t->str != NULL)
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) {
union mksh_ccphack cw;
/* XXX we assume the caller is right */
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;
for (iop = iow; (p = *iop++) != NULL; ) {
if (p->name != NULL)
afree(p->name, ap);
if (p->delim != NULL)
afree(p->delim, ap);
if (p->heredoc != NULL)
afree(p->heredoc, ap);
afree(p, ap);
}
afree(iow, ap);
}