410 lines
8.0 KiB
C
Executable File
410 lines
8.0 KiB
C
Executable File
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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/*
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: src/bin/sh/show.c,v 1.21 2004/04/06 20:06:51 markm Exp $");
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <errno.h>
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#include "shell.h"
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#include "parser.h"
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#include "nodes.h"
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#include "mystring.h"
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#include "show.h"
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#if DEBUG
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static void trputc(int c);
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static void shtree(union node *, int, char *, FILE*);
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static void shcmd(union node *, FILE *);
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static void sharg(union node *, FILE *);
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static void indent(int, char *, FILE *);
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static void trstring(char *);
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static void showtree(union node *n);
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static void
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showtree(union node *n)
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{
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trputs("showtree called\n");
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shtree(n, 1, NULL, stdout);
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}
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static void
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shtree(union node *n, int ind, char *pfx, FILE *fp)
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{
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struct nodelist *lp;
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char *s;
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if (n == NULL)
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return;
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indent(ind, pfx, fp);
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switch(n->type) {
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case NSEMI:
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s = "; ";
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goto binop;
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case NAND:
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s = " && ";
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goto binop;
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case NOR:
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s = " || ";
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binop:
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shtree(n->nbinary.ch1, ind, NULL, fp);
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/* if (ind < 0) */
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fputs(s, fp);
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shtree(n->nbinary.ch2, ind, NULL, fp);
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break;
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case NCMD:
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shcmd(n, fp);
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if (ind >= 0)
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putc('\n', fp);
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break;
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case NPIPE:
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for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
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shcmd(lp->n, fp);
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if (lp->next)
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fputs(" | ", fp);
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}
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if (n->npipe.backgnd)
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fputs(" &", fp);
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if (ind >= 0)
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putc('\n', fp);
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break;
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default:
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fprintf(fp, "<node type %d>", n->type);
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if (ind >= 0)
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putc('\n', fp);
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break;
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}
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}
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static void
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shcmd(union node *cmd, FILE *fp)
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{
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union node *np;
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int first;
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char *s;
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int dftfd;
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first = 1;
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for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
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if (! first)
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putchar(' ');
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sharg(np, fp);
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first = 0;
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}
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for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
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if (! first)
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putchar(' ');
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switch (np->nfile.type) {
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case NTO: s = ">"; dftfd = 1; break;
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case NAPPEND: s = ">>"; dftfd = 1; break;
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case NTOFD: s = ">&"; dftfd = 1; break;
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case NCLOBBER: s = ">|"; dftfd = 1; break;
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case NFROM: s = "<"; dftfd = 0; break;
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case NFROMTO: s = "<>"; dftfd = 0; break;
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case NFROMFD: s = "<&"; dftfd = 0; break;
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default: s = "*error*"; dftfd = 0; break;
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}
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if (np->nfile.fd != dftfd)
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fprintf(fp, "%d", np->nfile.fd);
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fputs(s, fp);
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if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
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if (np->ndup.dupfd >= 0)
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fprintf(fp, "%d", np->ndup.dupfd);
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else
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fprintf(fp, "-");
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} else {
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sharg(np->nfile.fname, fp);
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}
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first = 0;
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}
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}
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static void
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sharg(union node *arg, FILE *fp)
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{
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char *p;
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struct nodelist *bqlist;
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int subtype;
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if (arg->type != NARG) {
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printf("<node type %d>\n", arg->type);
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fflush(stdout);
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abort();
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}
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bqlist = arg->narg.backquote;
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for (p = arg->narg.text ; *p ; p++) {
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switch (*p) {
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case CTLESC:
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putc(*++p, fp);
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break;
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case CTLVAR:
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putc('$', fp);
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putc('{', fp);
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subtype = *++p;
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if (subtype == VSLENGTH)
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putc('#', fp);
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while (*p != '=')
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putc(*p++, fp);
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if (subtype & VSNUL)
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putc(':', fp);
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switch (subtype & VSTYPE) {
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case VSNORMAL:
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putc('}', fp);
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break;
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case VSMINUS:
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putc('-', fp);
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break;
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case VSPLUS:
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putc('+', fp);
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break;
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case VSQUESTION:
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putc('?', fp);
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break;
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case VSASSIGN:
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putc('=', fp);
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break;
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case VSTRIMLEFT:
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putc('#', fp);
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break;
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case VSTRIMLEFTMAX:
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putc('#', fp);
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putc('#', fp);
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break;
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case VSTRIMRIGHT:
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putc('%', fp);
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break;
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case VSTRIMRIGHTMAX:
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putc('%', fp);
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putc('%', fp);
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break;
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case VSLENGTH:
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break;
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default:
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printf("<subtype %d>", subtype);
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}
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break;
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case CTLENDVAR:
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putc('}', fp);
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break;
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case CTLBACKQ:
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case CTLBACKQ|CTLQUOTE:
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putc('$', fp);
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putc('(', fp);
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shtree(bqlist->n, -1, NULL, fp);
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putc(')', fp);
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break;
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default:
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putc(*p, fp);
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break;
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}
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}
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}
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static void
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indent(int amount, char *pfx, FILE *fp)
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{
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int i;
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for (i = 0 ; i < amount ; i++) {
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if (pfx && i == amount - 1)
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fputs(pfx, fp);
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putc('\t', fp);
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}
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}
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/*
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* Debugging stuff.
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*/
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FILE *tracefile;
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#if DEBUG == 2
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int debug = 1;
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#else
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int debug = 0;
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#endif
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static void
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trputc(int c)
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{
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if (tracefile == NULL)
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return;
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putc(c, tracefile);
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if (c == '\n')
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fflush(tracefile);
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}
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void
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sh_trace(const char *fmt, ...)
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{
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va_list va;
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va_start(va, fmt);
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if (tracefile != NULL) {
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(void) vfprintf(tracefile, fmt, va);
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if (strchr(fmt, '\n'))
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(void) fflush(tracefile);
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}
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va_end(va);
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}
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void
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trputs(char *s)
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{
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if (tracefile == NULL)
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return;
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fputs(s, tracefile);
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if (strchr(s, '\n'))
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fflush(tracefile);
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}
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static void
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trstring(char *s)
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{
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char *p;
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char c;
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if (tracefile == NULL)
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return;
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putc('"', tracefile);
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for (p = s ; *p ; p++) {
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switch (*p) {
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case '\n': c = 'n'; goto backslash;
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case '\t': c = 't'; goto backslash;
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case '\r': c = 'r'; goto backslash;
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case '"': c = '"'; goto backslash;
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case '\\': c = '\\'; goto backslash;
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case CTLESC: c = 'e'; goto backslash;
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case CTLVAR: c = 'v'; goto backslash;
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case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
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case CTLBACKQ: c = 'q'; goto backslash;
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case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
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backslash: putc('\\', tracefile);
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putc(c, tracefile);
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break;
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default:
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if (*p >= ' ' && *p <= '~')
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putc(*p, tracefile);
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else {
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putc('\\', tracefile);
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putc(*p >> 6 & 03, tracefile);
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putc(*p >> 3 & 07, tracefile);
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putc(*p & 07, tracefile);
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}
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break;
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}
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}
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putc('"', tracefile);
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}
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void
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trargs(char **ap)
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{
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if (tracefile == NULL)
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return;
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while (*ap) {
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trstring(*ap++);
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if (*ap)
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putc(' ', tracefile);
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else
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putc('\n', tracefile);
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}
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fflush(tracefile);
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}
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void
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opentrace(void)
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{
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char s[100];
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int flags;
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if (!debug)
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return;
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#ifdef not_this_way
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{
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char *p;
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if ((p = getenv("HOME")) == NULL) {
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if (geteuid() == 0)
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p = "/";
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else
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p = "/tmp";
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}
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scopy(p, s);
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strcat(s, "/trace");
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}
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#else
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scopy("./trace", s);
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#endif /* not_this_way */
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if ((tracefile = fopen(s, "a")) == NULL) {
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fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno));
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return;
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}
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if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
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fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
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fputs("\nTracing started.\n", tracefile);
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fflush(tracefile);
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}
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#endif /* DEBUG */
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/*
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* $PchId: show.c,v 1.6 2006/05/22 12:27:51 philip Exp $
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*/
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