ref: a7f5ecaf636e38f407c951d0e86dcc4c4f424bd6
dir: /sys/src/ape/cmd/pdksh/tree.c/
/*
* command tree climbing
*/
#include "sh.h"
#define INDENT 4
#define tputc(c, shf) shf_putchar(c, shf);
static void ptree ARGS((struct op *t, int indent, struct shf *f));
static void pioact ARGS((struct shf *f, int indent, struct ioword *iop));
static void tputC ARGS((int c, struct shf *shf));
static void tputS ARGS((char *wp, struct shf *shf));
static void vfptreef ARGS((struct shf *shf, int indent, const char *fmt, va_list va));
static struct ioword **iocopy ARGS((struct ioword **iow, Area *ap));
static void iofree ARGS((struct ioword **iow, Area *ap));
/*
* print a command tree
*/
static void
ptree(t, indent, shf)
register struct op *t;
int indent;
register struct shf *shf;
{
register char **w;
struct ioword **ioact;
struct op *t1;
Chain:
if (t == NULL)
return;
switch (t->type) {
case TCOM:
if (t->vars)
for (w = t->vars; *w != NULL; )
fptreef(shf, indent, "%S ", *w++);
else
fptreef(shf, indent, "#no-vars# ");
if (t->args)
for (w = t->args; *w != NULL; )
fptreef(shf, indent, "%S ", *w++);
else
fptreef(shf, indent, "#no-args# ");
break;
case TEXEC:
#if 0 /* ?not useful - can't be called? */
/* Print original vars */
if (t->left->vars)
for (w = t->left->vars; *w != NULL; )
fptreef(shf, indent, "%S ", *w++);
else
fptreef(shf, indent, "#no-vars# ");
/* Print expanded vars */
if (t->args)
for (w = t->args; *w != NULL; )
fptreef(shf, indent, "%s ", *w++);
else
fptreef(shf, indent, "#no-args# ");
/* Print original io */
t = t->left;
#else
t = t->left;
goto Chain;
#endif
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:
fptreef(shf, indent, "! ");
t = t->right;
goto Chain;
case TDBRACKET:
{
int i;
fptreef(shf, indent, "[[");
for (i = 0; t->args[i]; i++)
fptreef(shf, indent, " %S", t->args[i]);
fptreef(shf, indent, " ]] ");
break;
}
#ifdef KSH
case TSELECT:
fptreef(shf, indent, "select %s ", t->str);
/* fall through */
#endif /* KSH */
case TFOR:
if (t->type == TFOR)
fptreef(shf, indent, "for %s ", t->str);
if (t->vars != NULL) {
fptreef(shf, indent, "in ");
for (w = 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 = 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:
fptreef(shf, indent, "<botch>");
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) {
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(shf, indent, iop)
register struct shf *shf;
int indent;
register 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)
tputc('0' + iop->unit, shf);
switch (type) {
case IOREAD:
fptreef(shf, indent, "< ");
break;
case IOHERE:
if (flag&IOSKIP)
fptreef(shf, indent, "<<- ");
else
fptreef(shf, indent, "<< ");
break;
case IOCAT:
fptreef(shf, indent, ">> ");
break;
case IOWRITE:
if (flag&IOCLOB)
fptreef(shf, indent, ">| ");
else
fptreef(shf, indent, "> ");
break;
case IORDWR:
fptreef(shf, indent, "<> ");
break;
case IODUP:
if (flag & IORDUP)
fptreef(shf, indent, "<&");
else
fptreef(shf, indent, ">&");
break;
}
/* name/delim are 0 when printing syntax errors */
if (type == IOHERE) {
if (iop->delim)
fptreef(shf, indent, "%S ", iop->delim);
} 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(c, shf)
register int c;
register 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(wp, shf)
register char *wp;
register struct shf *shf;
{
register int c, quoted=0;
/* problems:
* `...` -> $(...)
* 'foo' -> "foo"
* could change encoding to:
* OQUOTE ["'] ... CQUOTE ["']
* COMSUB [(`] ...\0 (handle $ ` \ and maybe " in `...` case)
*/
while (1)
switch ((c = *wp++)) {
case EOS:
return;
case CHAR:
tputC(*wp++, shf);
break;
case QCHAR:
c = *wp++;
if (!quoted || (c == '"' || c == '`' || c == '$'))
tputc('\\', shf);
tputC(c, shf);
break;
case COMSUB:
tputc('$', shf);
tputc('(', shf);
while (*wp != 0)
tputC(*wp++, shf);
tputc(')', shf);
wp++;
break;
case EXPRSUB:
tputc('$', shf);
tputc('(', shf);
tputc('(', shf);
while (*wp != 0)
tputC(*wp++, shf);
tputc(')', shf);
tputc(')', shf);
wp++;
break;
case OQUOTE:
quoted = 1;
tputc('"', shf);
break;
case CQUOTE:
quoted = 0;
tputc('"', shf);
break;
case OSUBST:
tputc('$', shf);
if (*wp++ == '{')
tputc('{', shf);
while ((c = *wp++) != 0)
tputC(c, shf);
break;
case CSUBST:
if (*wp++ == '}')
tputc('}', shf);
break;
#ifdef KSH
case OPAT:
tputc(*wp++, shf);
tputc('(', shf);
break;
case SPAT:
tputc('|', shf);
break;
case CPAT:
tputc(')', shf);
break;
#endif /* KSH */
}
}
/*
* this is the _only_ way to reliably handle
* variable args with an ANSI compiler
*/
/* VARARGS */
int
#ifdef HAVE_PROTOTYPES
fptreef(struct shf *shf, int indent, const char *fmt, ...)
#else
fptreef(shf, indent, fmt, va_alist)
struct shf *shf;
int indent;
const char *fmt;
va_dcl
#endif
{
va_list va;
SH_VA_START(va, fmt);
vfptreef(shf, indent, fmt, va);
va_end(va);
return 0;
}
/* VARARGS */
char *
#ifdef HAVE_PROTOTYPES
snptreef(char *s, int n, const char *fmt, ...)
#else
snptreef(s, n, fmt, va_alist)
char *s;
int n;
const char *fmt;
va_dcl
#endif
{
va_list va;
struct shf shf;
shf_sopen(s, n, SHF_WR | (s ? 0 : SHF_DYNAMIC), &shf);
SH_VA_START(va, fmt);
vfptreef(&shf, 0, fmt, va);
va_end(va);
return shf_sclose(&shf); /* null terminates */
}
static void
vfptreef(shf, indent, fmt, va)
register struct shf *shf;
int indent;
const char *fmt;
register va_list va;
{
register int c;
while ((c = *fmt++))
if (c == '%') {
register long n;
register char *p;
int neg;
switch ((c = *fmt++)) {
case 'c':
tputc(va_arg(va, int), shf);
break;
case 's':
p = va_arg(va, char *);
while (*p)
tputc(*p++, shf);
break;
case 'S': /* word */
p = va_arg(va, char *);
tputS(p, shf);
break;
case 'd': case 'u': /* decimal */
n = (c == 'd') ? va_arg(va, int)
: va_arg(va, unsigned int);
neg = c=='d' && n<0;
p = ulton((neg) ? -n : n, 10);
if (neg)
*--p = '-';
while (*p)
tputc(*p++, shf);
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(t, ap)
register struct op *t;
Area *ap;
{
register struct op *r;
register char **tw, **rw;
if (t == NULL)
return NULL;
r = (struct op *) alloc(sizeof(struct op), ap);
r->type = t->type;
r->u.evalflags = t->u.evalflags;
r->str = t->type == TCASE ? wdcopy(t->str, ap) : str_save(t->str, ap);
if (t->vars == NULL)
r->vars = NULL;
else {
for (tw = t->vars; *tw++ != NULL; )
;
rw = r->vars = (char **)
alloc((int)(tw - t->vars) * sizeof(*tw), ap);
for (tw = t->vars; *tw != NULL; )
*rw++ = wdcopy(*tw++, ap);
*rw = NULL;
}
if (t->args == NULL)
r->args = NULL;
else {
for (tw = t->args; *tw++ != NULL; )
;
rw = r->args = (char **)
alloc((int)(tw - t->args) * 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(wp, ap)
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 */
char *
wdscan(wp, c)
register const char *wp;
register int c;
{
register int nest = 0;
while (1)
switch (*wp++) {
case EOS:
return (char *) wp;
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 (char *) wp;
nest--;
break;
#ifdef KSH
case OPAT:
nest++;
wp++;
break;
case SPAT:
case CPAT:
if (c == wp[-1] && nest == 0)
return (char *) wp;
if (wp[-1] == CPAT)
nest--;
break;
#endif /* KSH */
default:
internal_errorf(0,
"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(wp)
const char *wp;
{
struct shf shf;
int c;
shf_sopen((char *) 0, 32, SHF_WR | SHF_DYNAMIC, &shf);
/* problems:
* `...` -> $(...)
* x${foo:-"hi"} -> x${foo:-hi}
* x${foo:-'hi'} -> x${foo:-hi}
*/
while (1)
switch ((c = *wp++)) {
case EOS:
return shf_sclose(&shf); /* null terminates */
case CHAR:
case QCHAR:
shf_putchar(*wp++, &shf);
break;
case COMSUB:
shf_putchar('$', &shf);
shf_putchar('(', &shf);
while (*wp != 0)
shf_putchar(*wp++, &shf);
shf_putchar(')', &shf);
break;
case EXPRSUB:
shf_putchar('$', &shf);
shf_putchar('(', &shf);
shf_putchar('(', &shf);
while (*wp != 0)
shf_putchar(*wp++, &shf);
shf_putchar(')', &shf);
shf_putchar(')', &shf);
break;
case OQUOTE:
break;
case CQUOTE:
break;
case OSUBST:
shf_putchar('$', &shf);
if (*wp++ == '{')
shf_putchar('{', &shf);
while ((c = *wp++) != 0)
shf_putchar(c, &shf);
break;
case CSUBST:
if (*wp++ == '}')
shf_putchar('}', &shf);
break;
#ifdef KSH
case OPAT:
shf_putchar(*wp++, &shf);
shf_putchar('(', &shf);
break;
case SPAT:
shf_putchar('|', &shf);
break;
case CPAT:
shf_putchar(')', &shf);
break;
#endif /* KSH */
}
}
static struct ioword **
iocopy(iow, ap)
register struct ioword **iow;
Area *ap;
{
register struct ioword **ior;
register int i;
for (ior = iow; *ior++ != NULL; )
;
ior = (struct ioword **) alloc((int)(ior - iow) * sizeof(*ior), ap);
for (i = 0; iow[i] != NULL; i++) {
register struct ioword *p, *q;
p = iow[i];
q = (struct ioword *) alloc(sizeof(*p), ap);
ior[i] = q;
*q = *p;
if (p->name != (char *) 0)
q->name = wdcopy(p->name, ap);
if (p->delim != (char *) 0)
q->delim = wdcopy(p->delim, ap);
if (p->heredoc != (char *) 0)
q->heredoc = str_save(p->heredoc, ap);
}
ior[i] = NULL;
return ior;
}
/*
* free tree (for function definition)
*/
void
tfree(t, ap)
register struct op *t;
Area *ap;
{
register char **w;
if (t == NULL)
return;
if (t->str != NULL)
afree((void*)t->str, ap);
if (t->vars != NULL) {
for (w = t->vars; *w != NULL; w++)
afree((void*)*w, ap);
afree((void*)t->vars, ap);
}
if (t->args != NULL) {
for (w = t->args; *w != NULL; w++)
afree((void*)*w, ap);
afree((void*)t->args, ap);
}
if (t->ioact != NULL)
iofree(t->ioact, ap);
tfree(t->left, ap);
tfree(t->right, ap);
afree((void*)t, ap);
}
static void
iofree(iow, ap)
struct ioword **iow;
Area *ap;
{
register struct ioword **iop;
register struct ioword *p;
for (iop = iow; (p = *iop++) != NULL; ) {
if (p->name != NULL)
afree((void*)p->name, ap);
if (p->delim != NULL)
afree((void*)p->delim, ap);
if (p->heredoc != NULL)
afree((void*)p->heredoc, ap);
afree((void*)p, ap);
}
}