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-rw-r--r--bin/sh/show.c1175
1 files changed, 1175 insertions, 0 deletions
diff --git a/bin/sh/show.c b/bin/sh/show.c
new file mode 100644
index 0000000..fa9f5aa
--- /dev/null
+++ b/bin/sh/show.c
@@ -0,0 +1,1175 @@
+/* $NetBSD: show.c,v 1.52 2019/01/22 13:48:28 kre Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Copyright (c) 2017 The NetBSD Foundation, Inc. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95";
+#else
+__RCSID("$NetBSD: show.c,v 1.52 2019/01/22 13:48:28 kre Exp $");
+#endif
+#endif /* not lint */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <limits.h>
+
+#include <sys/types.h>
+#include <sys/uio.h>
+
+#include "shell.h"
+#include "parser.h"
+#include "nodes.h"
+#include "mystring.h"
+#include "show.h"
+#include "options.h"
+#include "redir.h"
+#include "error.h"
+#include "syntax.h"
+#include "input.h"
+#include "output.h"
+#include "var.h"
+#include "builtins.h"
+
+#define DEFINE_NODENAMES
+#include "nodenames.h" /* does almost nothing if !defined(DEBUG) */
+
+#define TR_STD_WIDTH 60 /* tend to fold lines wider than this */
+#define TR_IOVECS 10 /* number of lines or trace (max) / write */
+
+typedef struct traceinfo {
+ int tfd; /* file descriptor for open trace file */
+ int nxtiov; /* the buffer we should be writing to */
+ char lastc; /* the last non-white character output */
+ uint8_t supr; /* char classes to suppress after \n */
+ pid_t pid; /* process id of process that opened that file */
+ size_t llen; /* number of chars in current output line */
+ size_t blen; /* chars used in current buffer being filled */
+ char * tracefile; /* name of the tracefile */
+ struct iovec lines[TR_IOVECS]; /* filled, flling, pending buffers */
+} TFILE;
+
+/* These are auto turned off when non white space is printed */
+#define SUP_NL 0x01 /* don't print \n */
+#define SUP_SP 0x03 /* suppress spaces */
+#define SUP_WSP 0x04 /* suppress all white space */
+
+#ifdef DEBUG /* from here to end of file ... */
+
+TFILE tracedata, *tracetfile;
+FILE *tracefile; /* just for histedit */
+
+uint64_t DFlags; /* currently enabled debug flags */
+int ShNest; /* depth of shell (internal) nesting */
+
+static void shtree(union node *, int, int, int, TFILE *);
+static void shcmd(union node *, TFILE *);
+static void shsubsh(union node *, TFILE *);
+static void shredir(union node *, TFILE *, int);
+static void sharg(union node *, TFILE *);
+static void indent(int, TFILE *);
+static void trstring(const char *);
+static void trace_putc(char, TFILE *);
+static void trace_puts(const char *, TFILE *);
+static void trace_flush(TFILE *, int);
+static char *trace_id(TFILE *);
+static void trace_fd_swap(int, int);
+
+inline static int trlinelen(TFILE *);
+
+
+/*
+ * These functions are the externally visible interface
+ * (but only for a DEBUG shell.)
+ */
+
+void
+opentrace(void)
+{
+ char *s;
+ int fd;
+ int i;
+ pid_t pid;
+
+ if (debug != 1) {
+ /* leave fd open because libedit might be using it */
+ if (tracefile)
+ fflush(tracefile);
+ if (tracetfile)
+ trace_flush(tracetfile, 1);
+ return;
+ }
+#if DBG_PID == 1 /* using old shell.h, old tracing method */
+ DFlags = DBG_PID; /* just force DBG_PID on, and leave it ... */
+#endif
+ pid = getpid();
+ if (asprintf(&s, "trace.%jd", (intmax_t)pid) <= 0) {
+ debug = 0;
+ error("Cannot asprintf tracefilename");
+ };
+
+ fd = open(s, O_WRONLY|O_APPEND|O_CREAT, 0666);
+ if (fd == -1) {
+ debug = 0;
+ error("Can't open tracefile: %s (%s)\n", s, strerror(errno));
+ }
+ fd = to_upper_fd(fd);
+ if (fd <= 2) {
+ (void) close(fd);
+ debug = 0;
+ error("Attempt to use fd %d as tracefile thwarted\n", fd);
+ }
+ register_sh_fd(fd, trace_fd_swap);
+
+ /*
+ * This stuff is just so histedit has a FILE * to use
+ */
+ if (tracefile)
+ (void) fclose(tracefile); /* also closes tfd */
+ tracefile = fdopen(fd, "a"); /* don't care if it is NULL */
+ if (tracefile) /* except here... */
+ setlinebuf(tracefile);
+
+ /*
+ * Now the real tracing setup
+ */
+ if (tracedata.tfd > 0 && tracedata.tfd != fd)
+ (void) close(tracedata.tfd); /* usually done by fclose() */
+
+ tracedata.tfd = fd;
+ tracedata.pid = pid;
+ tracedata.nxtiov = 0;
+ tracedata.blen = 0;
+ tracedata.llen = 0;
+ tracedata.lastc = '\0';
+ tracedata.supr = SUP_NL | SUP_WSP;
+
+#define replace(f, v) do { \
+ if (tracedata.f != NULL) \
+ free(tracedata.f); \
+ tracedata.f = v; \
+ } while (/*CONSTCOND*/ 0)
+
+ replace(tracefile, s);
+
+ for (i = 0; i < TR_IOVECS; i++) {
+ replace(lines[i].iov_base, NULL);
+ tracedata.lines[i].iov_len = 0;
+ }
+
+#undef replace
+
+ tracetfile = &tracedata;
+
+ trace_puts("\nTracing started.\n", tracetfile);
+}
+
+void
+trace(const char *fmt, ...)
+{
+ va_list va;
+ char *s;
+
+ if (debug != 1 || !tracetfile)
+ return;
+ va_start(va, fmt);
+ (void) vasprintf(&s, fmt, va);
+ va_end(va);
+
+ trace_puts(s, tracetfile);
+ free(s);
+ if (tracetfile->llen == 0)
+ trace_flush(tracetfile, 0);
+}
+
+void
+tracev(const char *fmt, va_list va)
+{
+ va_list ap;
+ char *s;
+
+ if (debug != 1 || !tracetfile)
+ return;
+ va_copy(ap, va);
+ (void) vasprintf(&s, fmt, ap);
+ va_end(ap);
+
+ trace_puts(s, tracetfile);
+ free(s);
+ if (tracetfile->llen == 0)
+ trace_flush(tracetfile, 0);
+}
+
+
+void
+trputs(const char *s)
+{
+ if (debug != 1 || !tracetfile)
+ return;
+ trace_puts(s, tracetfile);
+}
+
+void
+trputc(int c)
+{
+ if (debug != 1 || !tracetfile)
+ return;
+ trace_putc(c, tracetfile);
+}
+
+void
+showtree(union node *n)
+{
+ TFILE *fp;
+
+ if ((fp = tracetfile) == NULL)
+ return;
+
+ trace_puts("showtree(", fp);
+ if (n == NULL)
+ trace_puts("NULL", fp);
+ else if (n == NEOF)
+ trace_puts("NEOF", fp);
+ else
+ trace("%p", n);
+ trace_puts(") called\n", fp);
+ if (n != NULL && n != NEOF)
+ shtree(n, 1, 1, 1, fp);
+}
+
+void
+trargs(char **ap)
+{
+ if (debug != 1 || !tracetfile)
+ return;
+ while (*ap) {
+ trstring(*ap++);
+ if (*ap)
+ trace_putc(' ', tracetfile);
+ }
+ trace_putc('\n', tracetfile);
+}
+
+void
+trargstr(union node *n)
+{
+ sharg(n, tracetfile);
+}
+
+
+/*
+ * Beyond here we just have the implementation of all of that
+ */
+
+
+inline static int
+trlinelen(TFILE * fp)
+{
+ return fp->llen;
+}
+
+static void
+shtree(union node *n, int ind, int ilvl, int nl, TFILE *fp)
+{
+ struct nodelist *lp;
+ const char *s;
+
+ if (n == NULL) {
+ if (nl)
+ trace_putc('\n', fp);
+ return;
+ }
+
+ indent(ind, fp);
+ switch (n->type) {
+ case NSEMI:
+ s = NULL;
+ goto binop;
+ case NAND:
+ s = " && ";
+ goto binop;
+ case NOR:
+ s = " || ";
+binop:
+ shtree(n->nbinary.ch1, 0, ilvl, 0, fp);
+ if (s != NULL)
+ trace_puts(s, fp);
+ if (trlinelen(fp) >= TR_STD_WIDTH) {
+ trace_putc('\n', fp);
+ indent(ind < 0 ? 2 : ind + 1, fp);
+ } else if (s == NULL) {
+ if (fp->lastc != '&')
+ trace_puts("; ", fp);
+ else
+ trace_putc(' ', fp);
+ }
+ shtree(n->nbinary.ch2, 0, ilvl, nl, fp);
+ break;
+ case NCMD:
+ shcmd(n, fp);
+ if (n->ncmd.backgnd)
+ trace_puts(" &", fp);
+ if (nl && trlinelen(fp) > 0)
+ trace_putc('\n', fp);
+ break;
+ case NPIPE:
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ shtree(lp->n, 0, ilvl, 0, fp);
+ if (lp->next) {
+ trace_puts(" |", fp);
+ if (trlinelen(fp) >= TR_STD_WIDTH) {
+ trace_putc('\n', fp);
+ indent((ind < 0 ? ilvl : ind) + 1, fp);
+ } else
+ trace_putc(' ', fp);
+ }
+ }
+ if (n->npipe.backgnd)
+ trace_puts(" &", fp);
+ if (nl || trlinelen(fp) >= TR_STD_WIDTH)
+ trace_putc('\n', fp);
+ break;
+ case NBACKGND:
+ case NSUBSHELL:
+ shsubsh(n, fp);
+ if (n->type == NBACKGND)
+ trace_puts(" &", fp);
+ if (nl && trlinelen(fp) > 0)
+ trace_putc('\n', fp);
+ break;
+ case NDEFUN:
+ trace_puts(n->narg.text, fp);
+ trace_puts("() {\n", fp);
+ indent(ind, fp);
+ shtree(n->narg.next, (ind < 0 ? ilvl : ind) + 1, ilvl+1, 1, fp);
+ indent(ind, fp);
+ trace_puts("}\n", fp);
+ break;
+ case NDNOT:
+ trace_puts("! ", fp);
+ /* FALLTHROUGH */
+ case NNOT:
+ trace_puts("! ", fp);
+ shtree(n->nnot.com, -1, ilvl, nl, fp);
+ break;
+ case NREDIR:
+ shtree(n->nredir.n, -1, ilvl, 0, fp);
+ shredir(n->nredir.redirect, fp, n->nredir.n == NULL);
+ if (nl)
+ trace_putc('\n', fp);
+ break;
+
+ case NIF:
+ itsif:
+ trace_puts("if ", fp);
+ shtree(n->nif.test, -1, ilvl, 0, fp);
+ if (trlinelen(fp) > 0 && trlinelen(fp) < TR_STD_WIDTH) {
+ if (fp->lastc != '&')
+ trace_puts(" ;", fp);
+ } else
+ indent(ilvl, fp);
+ trace_puts(" then ", fp);
+ if (nl || trlinelen(fp) > TR_STD_WIDTH - 24)
+ indent(ilvl+1, fp);
+ shtree(n->nif.ifpart, -1, ilvl + 1, 0, fp);
+ if (trlinelen(fp) > 0 && trlinelen(fp) < TR_STD_WIDTH) {
+ if (fp->lastc != '&')
+ trace_puts(" ;", fp);
+ } else
+ indent(ilvl, fp);
+ if (n->nif.elsepart && n->nif.elsepart->type == NIF) {
+ if (nl || trlinelen(fp) > TR_STD_WIDTH - 24)
+ indent(ilvl, fp);
+ n = n->nif.elsepart;
+ trace_puts(" el", fp);
+ goto itsif;
+ }
+ if (n->nif.elsepart) {
+ if (nl || trlinelen(fp) > TR_STD_WIDTH - 24)
+ indent(ilvl+1, fp);
+ trace_puts(" else ", fp);
+ shtree(n->nif.elsepart, -1, ilvl + 1, 0, fp);
+ if (fp->lastc != '&')
+ trace_puts(" ;", fp);
+ }
+ trace_puts(" fi", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ break;
+
+ case NWHILE:
+ trace_puts("while ", fp);
+ goto aloop;
+ case NUNTIL:
+ trace_puts("until ", fp);
+ aloop:
+ shtree(n->nbinary.ch1, -1, ilvl, 0, fp);
+ if (trlinelen(fp) > 0 && trlinelen(fp) < TR_STD_WIDTH) {
+ if (fp->lastc != '&')
+ trace_puts(" ;", fp);
+ } else
+ trace_putc('\n', fp);
+ trace_puts(" do ", fp);
+ shtree(n->nbinary.ch1, -1, ilvl + 1, 1, fp);
+ trace_puts(" done ", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ break;
+
+ case NFOR:
+ trace_puts("for ", fp);
+ trace_puts(n->nfor.var, fp);
+ if (n->nfor.args) {
+ union node *argp;
+
+ trace_puts(" in ", fp);
+ for (argp = n->nfor.args; argp; argp=argp->narg.next) {
+ sharg(argp, fp);
+ trace_putc(' ', fp);
+ }
+ if (trlinelen(fp) > 0 && trlinelen(fp) < TR_STD_WIDTH) {
+ if (fp->lastc != '&')
+ trace_putc(';', fp);
+ } else
+ trace_putc('\n', fp);
+ }
+ trace_puts(" do ", fp);
+ shtree(n->nfor.body, -1, ilvl + 1, 0, fp);
+ if (fp->lastc != '&')
+ trace_putc(';', fp);
+ trace_puts(" done", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ break;
+
+ case NCASE:
+ trace_puts("case ", fp);
+ sharg(n->ncase.expr, fp);
+ trace_puts(" in", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ {
+ union node *cp;
+
+ for (cp = n->ncase.cases ; cp ; cp = cp->nclist.next) {
+ union node *patp;
+
+ if (nl || trlinelen(fp) > TR_STD_WIDTH - 16)
+ indent(ilvl, fp);
+ else
+ trace_putc(' ', fp);
+ trace_putc('(', fp);
+ patp = cp->nclist.pattern;
+ while (patp != NULL) {
+ trace_putc(' ', fp);
+ sharg(patp, fp);
+ trace_putc(' ', fp);
+ if ((patp = patp->narg.next) != NULL)
+ trace_putc('|', fp);
+ }
+ trace_putc(')', fp);
+ if (nl)
+ indent(ilvl + 1, fp);
+ else
+ trace_putc(' ', fp);
+ shtree(cp->nclist.body, -1, ilvl+2, 0, fp);
+ if (cp->type == NCLISTCONT)
+ trace_puts(" ;&", fp);
+ else
+ trace_puts(" ;;", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ }
+ }
+ if (nl) {
+ trace_putc('\n', fp);
+ indent(ind, fp);
+ } else
+ trace_putc(' ', fp);
+ trace_puts("esac", fp);
+ if (nl)
+ trace_putc('\n', fp);
+ break;
+
+ default: {
+ char *str;
+
+ asprintf(&str, "<node type %d [%s]>", n->type,
+ NODETYPENAME(n->type));
+ trace_puts(str, fp);
+ free(str);
+ if (nl)
+ trace_putc('\n', fp);
+ }
+ break;
+ }
+}
+
+
+static void
+shcmd(union node *cmd, TFILE *fp)
+{
+ union node *np;
+ int first;
+
+ first = 1;
+ for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
+ if (! first)
+ trace_putc(' ', fp);
+ sharg(np, fp);
+ first = 0;
+ }
+ shredir(cmd->ncmd.redirect, fp, first);
+}
+
+static void
+shsubsh(union node *cmd, TFILE *fp)
+{
+ trace_puts(" ( ", fp);
+ shtree(cmd->nredir.n, -1, 3, 0, fp);
+ trace_puts(" ) ", fp);
+ shredir(cmd->ncmd.redirect, fp, 1);
+}
+
+static void
+shredir(union node *np, TFILE *fp, int first)
+{
+ const char *s;
+ int dftfd;
+ char buf[106];
+
+ for ( ; np ; np = np->nfile.next) {
+ if (! first)
+ trace_putc(' ', fp);
+ switch (np->nfile.type) {
+ case NTO: s = ">"; dftfd = 1; break;
+ case NCLOBBER: s = ">|"; dftfd = 1; break;
+ case NAPPEND: s = ">>"; dftfd = 1; break;
+ case NTOFD: s = ">&"; dftfd = 1; break;
+ case NFROM: s = "<"; dftfd = 0; break;
+ case NFROMFD: s = "<&"; dftfd = 0; break;
+ case NFROMTO: s = "<>"; dftfd = 0; break;
+ case NXHERE: /* FALLTHROUGH */
+ case NHERE: s = "<<"; dftfd = 0; break;
+ default: s = "*error*"; dftfd = 0; break;
+ }
+ if (np->nfile.fd != dftfd) {
+ sprintf(buf, "%d", np->nfile.fd);
+ trace_puts(buf, fp);
+ }
+ trace_puts(s, fp);
+ if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
+ if (np->ndup.vname)
+ sharg(np->ndup.vname, fp);
+ else {
+ if (np->ndup.dupfd < 0)
+ trace_puts("-", fp);
+ else {
+ sprintf(buf, "%d", np->ndup.dupfd);
+ trace_puts(buf, fp);
+ }
+ }
+ } else
+ if (np->nfile.type == NHERE || np->nfile.type == NXHERE) {
+ if (np->nfile.type == NHERE)
+ trace_putc('\\', fp);
+ trace_puts("!!!\n", fp);
+ s = np->nhere.doc->narg.text;
+ if (strlen(s) > 100) {
+ memmove(buf, s, 100);
+ buf[100] = '\0';
+ strcat(buf, " ...\n");
+ s = buf;
+ }
+ trace_puts(s, fp);
+ trace_puts("!!! ", fp);
+ } else {
+ sharg(np->nfile.fname, fp);
+ }
+ first = 0;
+ }
+}
+
+static void
+sharg(union node *arg, TFILE *fp)
+{
+ char *p, *s;
+ struct nodelist *bqlist;
+ int subtype = 0;
+ int quoted = 0;
+
+ if (arg->type != NARG) {
+ asprintf(&s, "<node type %d> ! NARG\n", arg->type);
+ trace_puts(s, fp);
+ abort(); /* no need to free s, better not to */
+ }
+
+ bqlist = arg->narg.backquote;
+ for (p = arg->narg.text ; *p ; p++) {
+ switch (*p) {
+ case CTLESC:
+ trace_putc('\\', fp);
+ trace_putc(*++p, fp);
+ break;
+
+ case CTLNONL:
+ trace_putc('\\', fp);
+ trace_putc('\n', fp);
+ break;
+
+ case CTLVAR:
+ subtype = *++p;
+ if (!quoted != !(subtype & VSQUOTE))
+ trace_putc('"', fp);
+ trace_putc('$', fp);
+ trace_putc('{', fp); /*}*/
+ if ((subtype & VSTYPE) == VSLENGTH)
+ trace_putc('#', fp);
+ if (subtype & VSLINENO)
+ trace_puts("LINENO=", fp);
+
+ while (*++p != '=')
+ trace_putc(*p, fp);
+
+ if (subtype & VSNUL)
+ trace_putc(':', fp);
+
+ switch (subtype & VSTYPE) {
+ case VSNORMAL:
+ /* { */
+ trace_putc('}', fp);
+ if (!quoted != !(subtype & VSQUOTE))
+ trace_putc('"', fp);
+ break;
+ case VSMINUS:
+ trace_putc('-', fp);
+ break;
+ case VSPLUS:
+ trace_putc('+', fp);
+ break;
+ case VSQUESTION:
+ trace_putc('?', fp);
+ break;
+ case VSASSIGN:
+ trace_putc('=', fp);
+ break;
+ case VSTRIMLEFTMAX:
+ trace_putc('#', fp);
+ /* FALLTHROUGH */
+ case VSTRIMLEFT:
+ trace_putc('#', fp);
+ break;
+ case VSTRIMRIGHTMAX:
+ trace_putc('%', fp);
+ /* FALLTHROUGH */
+ case VSTRIMRIGHT:
+ trace_putc('%', fp);
+ break;
+ case VSLENGTH:
+ break;
+ default: {
+ char str[32];
+
+ snprintf(str, sizeof str,
+ "<subtype %d>", subtype);
+ trace_puts(str, fp);
+ }
+ break;
+ }
+ break;
+ case CTLENDVAR:
+ /* { */
+ trace_putc('}', fp);
+ if (!quoted != !(subtype & VSQUOTE))
+ trace_putc('"', fp);
+ subtype = 0;
+ break;
+
+ case CTLBACKQ|CTLQUOTE:
+ if (!quoted)
+ trace_putc('"', fp);
+ /* FALLTHRU */
+ case CTLBACKQ:
+ trace_putc('$', fp);
+ trace_putc('(', fp);
+ if (bqlist) {
+ shtree(bqlist->n, -1, 3, 0, fp);
+ bqlist = bqlist->next;
+ } else
+ trace_puts("???", fp);
+ trace_putc(')', fp);
+ if (!quoted && *p == (CTLBACKQ|CTLQUOTE))
+ trace_putc('"', fp);
+ break;
+
+ case CTLQUOTEMARK:
+ if (subtype != 0 || !quoted) {
+ trace_putc('"', fp);
+ quoted++;
+ }
+ break;
+ case CTLQUOTEEND:
+ trace_putc('"', fp);
+ quoted--;
+ break;
+ case CTLARI:
+ if (*p == ' ')
+ p++;
+ trace_puts("$(( ", fp);
+ break;
+ case CTLENDARI:
+ trace_puts(" ))", fp);
+ break;
+
+ default:
+ if (*p == '$')
+ trace_putc('\\', fp);
+ trace_putc(*p, fp);
+ break;
+ }
+ }
+ if (quoted)
+ trace_putc('"', fp);
+}
+
+
+static void
+indent(int amount, TFILE *fp)
+{
+ int i;
+
+ if (amount <= 0)
+ return;
+
+ amount <<= 2; /* indent slots -> chars */
+
+ i = trlinelen(fp);
+ fp->supr = SUP_NL;
+ if (i > amount) {
+ trace_putc('\n', fp);
+ i = 0;
+ }
+ fp->supr = 0;
+ for (; i < amount - 7 ; i++) {
+ trace_putc('\t', fp);
+ i |= 7;
+ }
+ while (i < amount) {
+ trace_putc(' ', fp);
+ i++;
+ }
+ fp->supr = SUP_WSP;
+}
+
+static void
+trace_putc(char c, TFILE *fp)
+{
+ char *p;
+
+ if (c == '\0')
+ return;
+ if (debug == 0 || fp == NULL)
+ return;
+
+ if (fp->llen == 0) {
+ if (fp->blen != 0)
+ abort();
+
+ if ((fp->supr & SUP_NL) && c == '\n')
+ return;
+ if ((fp->supr & (SUP_WSP|SUP_SP)) && c == ' ')
+ return;
+ if ((fp->supr & SUP_WSP) && c == '\t')
+ return;
+
+ if (fp->nxtiov >= TR_IOVECS - 1) /* should be rare */
+ trace_flush(fp, 0);
+
+ p = trace_id(fp);
+ if (p != NULL) {
+ fp->lines[fp->nxtiov].iov_base = p;
+ fp->lines[fp->nxtiov].iov_len = strlen(p);
+ fp->nxtiov++;
+ }
+ } else if (fp->blen && fp->blen >= fp->lines[fp->nxtiov].iov_len) {
+ fp->blen = 0;
+ if (++fp->nxtiov >= TR_IOVECS)
+ trace_flush(fp, 0);
+ }
+
+ if (fp->lines[fp->nxtiov].iov_len == 0) {
+ p = (char *)malloc(2 * TR_STD_WIDTH);
+ if (p == NULL) {
+ trace_flush(fp, 1);
+ debug = 0;
+ return;
+ }
+ *p = '\0';
+ fp->lines[fp->nxtiov].iov_base = p;
+ fp->lines[fp->nxtiov].iov_len = 2 * TR_STD_WIDTH;
+ fp->blen = 0;
+ }
+
+ p = (char *)fp->lines[fp->nxtiov].iov_base + fp->blen++;
+ *p++ = c;
+ *p = 0;
+
+ if (c != ' ' && c != '\t' && c != '\n') {
+ fp->lastc = c;
+ fp->supr = 0;
+ }
+
+ if (c == '\n') {
+ fp->lines[fp->nxtiov++].iov_len = fp->blen;
+ fp->blen = 0;
+ fp->llen = 0;
+ fp->supr |= SUP_NL;
+ return;
+ }
+
+ if (c == '\t')
+ fp->llen |= 7;
+ fp->llen++;
+}
+
+void
+trace_flush(TFILE *fp, int all)
+{
+ int niov, i;
+ ssize_t written;
+
+ niov = fp->nxtiov;
+ if (all && fp->blen > 0) {
+ fp->lines[niov].iov_len = fp->blen;
+ fp->blen = 0;
+ fp->llen = 0;
+ niov++;
+ }
+ if (niov == 0)
+ return;
+ if (fp->blen > 0 && --niov == 0)
+ return;
+ written = writev(fp->tfd, fp->lines, niov);
+ for (i = 0; i < niov; i++) {
+ free(fp->lines[i].iov_base);
+ fp->lines[i].iov_base = NULL;
+ fp->lines[i].iov_len = 0;
+ }
+ if (written == -1) {
+ if (fp->blen > 0) {
+ free(fp->lines[niov].iov_base);
+ fp->lines[niov].iov_base = NULL;
+ fp->lines[niov].iov_len = 0;
+ }
+ debug = 0;
+ fp->blen = 0;
+ fp->llen = 0;
+ return;
+ }
+ if (fp->blen > 0) {
+ fp->lines[0].iov_base = fp->lines[niov].iov_base;
+ fp->lines[0].iov_len = fp->lines[niov].iov_len;
+ fp->lines[niov].iov_base = NULL;
+ fp->lines[niov].iov_len = 0;
+ }
+ fp->nxtiov = 0;
+}
+
+void
+trace_puts(const char *s, TFILE *fp)
+{
+ char c;
+
+ while ((c = *s++) != '\0')
+ trace_putc(c, fp);
+}
+
+inline static char *
+trace_id(TFILE *tf)
+{
+ int i;
+ char indent[16];
+ char *p;
+ int lno;
+ char c;
+
+ if (DFlags & DBG_NEST) {
+ if ((unsigned)ShNest >= sizeof indent - 1) {
+ (void) snprintf(indent, sizeof indent,
+ "### %*d ###", (int)(sizeof indent) - 9, ShNest);
+ p = strchr(indent, '\0');
+ } else {
+ p = indent;
+ for (i = 0; i < 6; i++)
+ *p++ = (i < ShNest) ? '#' : ' ';
+ while (i++ < ShNest && p < &indent[sizeof indent - 1])
+ *p++ = '#';
+ *p = '\0';
+ }
+ } else
+ indent[0] = '\0';
+
+ /*
+ * If we are in the parser, then plinno is the current line
+ * number being processed (parser line no).
+ * If we are elsewhere, then line_number gives the source
+ * line of whatever we are currently doing (close enough.)
+ */
+ if (parsing)
+ lno = plinno;
+ else
+ lno = line_number;
+
+ c = ((i = getpid()) == tf->pid) ? ':' : '=';
+
+ if (DFlags & DBG_PID) {
+ if (DFlags & DBG_LINE)
+ (void) asprintf(&p, "%5d%c%s\t%4d%c@\t", i, c,
+ indent, lno, parsing?'-':'+');
+ else
+ (void) asprintf(&p, "%5d%c%s\t", i, c, indent);
+ return p;
+ } else if (DFlags & DBG_NEST) {
+ if (DFlags & DBG_LINE)
+ (void) asprintf(&p, "%c%s\t%4d%c@\t", c, indent, lno,
+ parsing?'-':'+');
+ else
+ (void) asprintf(&p, "%c%s\t", c, indent);
+ return p;
+ } else if (DFlags & DBG_LINE) {
+ (void) asprintf(&p, "%c%4d%c@\t", c, lno, parsing?'-':'+');
+ return p;
+ }
+ return NULL;
+}
+
+/*
+ * Used only from trargs(), which itself is used only to print
+ * arg lists (argv[]) either that passed into this shell, or
+ * the arg list about to be given to some other command (incl
+ * builtin, and function) as their argv[]. If any of the CTL*
+ * chars seem to appear, they really should be just treated as data,
+ * not special... But this is just debug, so, who cares!
+ */
+static void
+trstring(const char *s)
+{
+ const char *p;
+ char c;
+ TFILE *fp;
+
+ if (debug != 1 || !tracetfile)
+ return;
+ fp = tracetfile;
+ trace_putc('"', fp);
+ 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: trace_putc('\\', fp);
+ trace_putc(c, fp);
+ break;
+ default:
+ if (*p >= ' ' && *p <= '~')
+ trace_putc(*p, fp);
+ else {
+ trace_putc('\\', fp);
+ trace_putc(*p >> 6 & 03, fp);
+ trace_putc(*p >> 3 & 07, fp);
+ trace_putc(*p & 07, fp);
+ }
+ break;
+ }
+ }
+ trace_putc('"', fp);
+}
+
+/*
+ * deal with the user "accidentally" picking our fd to use.
+ */
+static void
+trace_fd_swap(int from, int to)
+{
+ if (tracetfile == NULL || from == to)
+ return;
+
+ tracetfile->tfd = to;
+
+ /*
+ * This is just so histedit has a stdio FILE* to use.
+ */
+ if (tracefile)
+ fclose(tracefile);
+ tracefile = fdopen(to, "a");
+ if (tracefile)
+ setlinebuf(tracefile);
+}
+
+
+static struct debug_flag {
+ char label;
+ uint64_t flag;
+} debug_flags[] = {
+ { 'a', DBG_ARITH }, /* arithmetic ( $(( )) ) */
+ { 'c', DBG_CMDS }, /* command searching, ... */
+ { 'e', DBG_EVAL }, /* evaluation of the parse tree */
+ { 'f', DBG_REDIR }, /* file descriptors & redirections */
+ { 'g', DBG_MATCH }, /* pattern matching (glob) */
+ { 'h', DBG_HISTORY }, /* history & cmd line editing */
+ { 'i', DBG_INPUT }, /* shell input routines */
+ { 'j', DBG_JOBS }, /* job control, structures */
+ { 'l', DBG_LEXER }, /* lexical analysis */
+ { 'm', DBG_MEM }, /* memory management */
+ { 'o', DBG_OUTPUT }, /* output routines */
+ { 'p', DBG_PROCS }, /* process management, fork, ... */
+ { 'r', DBG_PARSE }, /* parser, lexer, ... tree building */
+ { 's', DBG_SIG }, /* signals and everything related */
+ { 't', DBG_TRAP }, /* traps & signals */
+ { 'v', DBG_VARS }, /* variables and parameters */
+ { 'w', DBG_WAIT }, /* waits for processes to finish */
+ { 'x', DBG_EXPAND }, /* word expansion ${} $() $(( )) */
+ { 'z', DBG_ERRS }, /* error control, jumps, cleanup */
+
+ { '0', DBG_U0 }, /* ad-hoc temp debug flag #0 */
+ { '1', DBG_U1 }, /* ad-hoc temp debug flag #1 */
+ { '2', DBG_U2 }, /* ad-hoc temp debug flag #2 */
+ { '3', DBG_U3 }, /* ad-hoc temp debug flag #3 */
+
+ { '@', DBG_LINE }, /* prefix trace lines with line# */
+ { '$', DBG_PID }, /* prefix trace lines with sh pid */
+ { '^', DBG_NEST }, /* show shell nesting level */
+
+ /* alpha options only - but not DBG_LEXER */
+ { '_', DBG_PARSE | DBG_EVAL | DBG_EXPAND | DBG_JOBS | DBG_SIG |
+ DBG_PROCS | DBG_REDIR | DBG_CMDS | DBG_ERRS |
+ DBG_WAIT | DBG_TRAP | DBG_VARS | DBG_MEM | DBG_MATCH |
+ DBG_INPUT | DBG_OUTPUT | DBG_ARITH | DBG_HISTORY },
+
+ /* { '*', DBG_ALLVERBOSE }, is handled in the code */
+
+ { '#', DBG_U0 | DBG_U1 | DBG_U2 | DBG_U3 },
+
+ { 0, 0 }
+};
+
+void
+set_debug(const char * flags, int on)
+{
+ char f;
+ struct debug_flag *df;
+ int verbose;
+
+ while ((f = *flags++) != '\0') {
+ verbose = 0;
+ if (is_upper(f)) {
+ verbose = 1;
+ f += 'a' - 'A';
+ }
+ if (f == '*')
+ f = '_', verbose = 1;
+ if (f == '+') {
+ if (*flags == '+')
+ flags++, verbose=1;
+ }
+
+ /*
+ * Note: turning on any debug option also enables DBG_ALWAYS
+ * turning on any verbose option also enables DBG_VERBOSE
+ * Once enabled, those flags cannot be disabled.
+ * (tracing can still be turned off with "set +o debug")
+ */
+ for (df = debug_flags; df->label != '\0'; df++) {
+ if (f == '+' || df->label == f) {
+ if (on) {
+ DFlags |= DBG_ALWAYS | df->flag;
+ if (verbose)
+ DFlags |= DBG_VERBOSE |
+ (df->flag << DBG_VBOSE_SHIFT);
+ } else {
+ DFlags &= ~(df->flag<<DBG_VBOSE_SHIFT);
+ if (!verbose)
+ DFlags &= ~df->flag;
+ }
+ }
+ }
+ }
+}
+
+
+int
+debugcmd(int argc, char **argv)
+{
+ if (argc == 1) {
+ struct debug_flag *df;
+
+ out1fmt("Debug: %sabled. Flags: ", debug ? "en" : "dis");
+ for (df = debug_flags; df->label != '\0'; df++) {
+ if (df->flag & (df->flag - 1))
+ continue;
+ if (is_alpha(df->label) &&
+ (df->flag << DBG_VBOSE_SHIFT) & DFlags)
+ out1c(df->label - ('a' - 'A'));
+ else if (df->flag & DFlags)
+ out1c(df->label);
+ }
+ out1c('\n');
+ return 0;
+ }
+
+ while (*++argv) {
+ if (**argv == '-')
+ set_debug(*argv + 1, 1);
+ else if (**argv == '+')
+ set_debug(*argv + 1, 0);
+ else
+ return 1;
+ }
+ return 0;
+}
+
+#endif /* DEBUG */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-20 23:01:54 +0000