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freebsd-skq/bin/sh/show.c
imp 7e6cabd06e Renumber copyright clause 4 
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include "shell.h"
#include "parser.h"
#include "nodes.h"
#include "mystring.h"
#include "show.h"
#ifdef DEBUG
static void shtree(union node *, int, char *, FILE*);
static void shcmd(union node *, FILE *);
static void sharg(union node *, FILE *);
static void indent(int, char *, FILE *);
static void trstring(char *);
void
showtree(union node *n)
{
trputs("showtree called\n");
shtree(n, 1, NULL, stdout);
}
static void
shtree(union node *n, int ind, char *pfx, FILE *fp)
{
struct nodelist *lp;
char *s;
if (n == NULL)
return;
indent(ind, pfx, fp);
switch(n->type) {
case NSEMI:
s = "; ";
goto binop;
case NAND:
s = " && ";
goto binop;
case NOR:
s = " || ";
binop:
shtree(n->nbinary.ch1, ind, NULL, fp);
/* if (ind < 0) */
fputs(s, fp);
shtree(n->nbinary.ch2, ind, NULL, fp);
break;
case NCMD:
shcmd(n, fp);
if (ind >= 0)
putc('\n', fp);
break;
case NPIPE:
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
shcmd(lp->n, fp);
if (lp->next)
fputs(" | ", fp);
}
if (n->npipe.backgnd)
fputs(" &", fp);
if (ind >= 0)
putc('\n', fp);
break;
default:
fprintf(fp, "<node type %d>", n->type);
if (ind >= 0)
putc('\n', fp);
break;
}
}
static void
shcmd(union node *cmd, FILE *fp)
{
union node *np;
int first;
char *s;
int dftfd;
first = 1;
for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
if (! first)
putchar(' ');
sharg(np, fp);
first = 0;
}
for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
if (! first)
putchar(' ');
switch (np->nfile.type) {
case NTO: s = ">"; dftfd = 1; break;
case NAPPEND: s = ">>"; dftfd = 1; break;
case NTOFD: s = ">&"; dftfd = 1; break;
case NCLOBBER: s = ">|"; dftfd = 1; break;
case NFROM: s = "<"; dftfd = 0; break;
case NFROMTO: s = "<>"; dftfd = 0; break;
case NFROMFD: s = "<&"; dftfd = 0; break;
case NHERE: s = "<<"; dftfd = 0; break;
case NXHERE: s = "<<"; dftfd = 0; break;
default: s = "*error*"; dftfd = 0; break;
}
if (np->nfile.fd != dftfd)
fprintf(fp, "%d", np->nfile.fd);
fputs(s, fp);
if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
if (np->ndup.dupfd >= 0)
fprintf(fp, "%d", np->ndup.dupfd);
else
fprintf(fp, "-");
} else if (np->nfile.type == NHERE) {
fprintf(fp, "HERE");
} else if (np->nfile.type == NXHERE) {
fprintf(fp, "XHERE");
} else {
sharg(np->nfile.fname, fp);
}
first = 0;
}
}
static void
sharg(union node *arg, FILE *fp)
{
char *p;
struct nodelist *bqlist;
int subtype;
if (arg->type != NARG) {
printf("<node type %d>\n", arg->type);
fflush(stdout);
abort();
}
bqlist = arg->narg.backquote;
for (p = arg->narg.text ; *p ; p++) {
switch (*p) {
case CTLESC:
putc(*++p, fp);
break;
case CTLVAR:
putc('$', fp);
putc('{', fp);
subtype = *++p;
if (subtype == VSLENGTH)
putc('#', fp);
while (*p != '=')
putc(*p++, fp);
if (subtype & VSNUL)
putc(':', fp);
switch (subtype & VSTYPE) {
case VSNORMAL:
putc('}', fp);
break;
case VSMINUS:
putc('-', fp);
break;
case VSPLUS:
putc('+', fp);
break;
case VSQUESTION:
putc('?', fp);
break;
case VSASSIGN:
putc('=', fp);
break;
case VSTRIMLEFT:
putc('#', fp);
break;
case VSTRIMLEFTMAX:
putc('#', fp);
putc('#', fp);
break;
case VSTRIMRIGHT:
putc('%', fp);
break;
case VSTRIMRIGHTMAX:
putc('%', fp);
putc('%', fp);
break;
case VSLENGTH:
break;
default:
printf("<subtype %d>", subtype);
}
break;
case CTLENDVAR:
putc('}', fp);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
putc('$', fp);
putc('(', fp);
shtree(bqlist->n, -1, NULL, fp);
putc(')', fp);
break;
default:
putc(*p, fp);
break;
}
}
}
static void
indent(int amount, char *pfx, FILE *fp)
{
int i;
for (i = 0 ; i < amount ; i++) {
if (pfx && i == amount - 1)
fputs(pfx, fp);
putc('\t', fp);
}
}
/*
* Debugging stuff.
*/
FILE *tracefile;
#if DEBUG >= 2
int debug = 1;
#else
int debug = 0;
#endif
void
trputc(int c)
{
if (tracefile == NULL)
return;
putc(c, tracefile);
if (c == '\n')
fflush(tracefile);
}
void
sh_trace(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
if (tracefile != NULL) {
(void) vfprintf(tracefile, fmt, va);
if (strchr(fmt, '\n'))
(void) fflush(tracefile);
}
va_end(va);
}
void
trputs(const char *s)
{
if (tracefile == NULL)
return;
fputs(s, tracefile);
if (strchr(s, '\n'))
fflush(tracefile);
}
static void
trstring(char *s)
{
char *p;
char c;
if (tracefile == NULL)
return;
putc('"', tracefile);
for (p = s ; *p ; p++) {
switch (*p) {
case '\n': c = 'n'; goto backslash;
case '\t': c = 't'; goto backslash;
case '\r': c = 'r'; goto backslash;
case '"': c = '"'; goto backslash;
case '\\': c = '\\'; goto backslash;
case CTLESC: c = 'e'; goto backslash;
case CTLVAR: c = 'v'; goto backslash;
case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
case CTLBACKQ: c = 'q'; goto backslash;
case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
backslash: putc('\\', tracefile);
putc(c, tracefile);
break;
default:
if (*p >= ' ' && *p <= '~')
putc(*p, tracefile);
else {
putc('\\', tracefile);
putc(*p >> 6 & 03, tracefile);
putc(*p >> 3 & 07, tracefile);
putc(*p & 07, tracefile);
}
break;
}
}
putc('"', tracefile);
}
void
trargs(char **ap)
{
if (tracefile == NULL)
return;
while (*ap) {
trstring(*ap++);
if (*ap)
putc(' ', tracefile);
else
putc('\n', tracefile);
}
fflush(tracefile);
}
void
opentrace(void)
{
char s[100];
int flags;
if (!debug)
return;
#ifdef not_this_way
{
char *p;
if ((p = getenv("HOME")) == NULL) {
if (geteuid() == 0)
p = "/";
else
p = "/tmp";
}
strcpy(s, p);
strcat(s, "/trace");
}
#else
strcpy(s, "./trace");
#endif /* not_this_way */
if ((tracefile = fopen(s, "a")) == NULL) {
fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno));
return;
}
if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
fputs("\nTracing started.\n", tracefile);
fflush(tracefile);
}
#endif /* DEBUG */
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