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freebsd/bin/sh/show.c

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C
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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.
* 4. 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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