diff options
Diffstat (limited to 'bin/sh/show.c')
-rw-r--r-- | bin/sh/show.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/bin/sh/show.c b/bin/sh/show.c new file mode 100644 index 0000000..9807c99 --- /dev/null +++ b/bin/sh/show.c @@ -0,0 +1,378 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 +static char sccsid[] = "@(#)show.c 8.1 (Berkeley) 5/31/93"; +#endif /* not lint */ + +#include <stdio.h> +#include "shell.h" +#include "parser.h" +#include "nodes.h" +#include "mystring.h" + + +#ifdef DEBUG +static shtree(), shcmd(), sharg(), indent(); + + +showtree(n) + union node *n; + { + trputs("showtree called\n"); + shtree(n, 1, NULL, stdout); +} + + +static +shtree(n, ind, pfx, fp) + union node *n; + char *pfx; + FILE *fp; + { + struct nodelist *lp; + char *s; + + 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 +shcmd(cmd, fp) + 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 NFROM: s = "<"; dftfd = 0; break; + case NFROMFD: s = "<&"; 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) { + fprintf(fp, "%d", np->ndup.dupfd); + } else { + sharg(np->nfile.fname, fp); + } + first = 0; + } +} + + + +static +sharg(arg, fp) + 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('$', fp); + putc('{', fp); + subtype = *++p; + while (*p != '=') + putc(*p++, fp); + if (subtype & VSNUL) + putc(':', fp); + switch (subtype & VSTYPE) { + case VSNORMAL: + putc('}', fp); + break; + case VSMINUS: + putc('-', fp); + break; + case VSPLUS: + putc('+', fp); + break; + case VSQUESTION: + putc('?', fp); + break; + case VSASSIGN: + putc('=', fp); + break; + default: + printf("<subtype %d>", subtype); + } + break; + case CTLENDVAR: + putc('}', fp); + break; + case CTLBACKQ: + case CTLBACKQ|CTLQUOTE: + putc('$', fp); + putc('(', fp); + shtree(bqlist->n, -1, NULL, fp); + putc(')', fp); + break; + default: + putc(*p, fp); + break; + } + } +} + + +static +indent(amount, pfx, fp) + char *pfx; + FILE *fp; + { + int i; + + for (i = 0 ; i < amount ; i++) { + if (pfx && i == amount - 1) + fputs(pfx, fp); + putc('\t', fp); + } +} +#endif + + + +/* + * Debugging stuff. + */ + + +FILE *tracefile; + +#if DEBUG == 2 +int debug = 1; +#else +int debug = 0; +#endif + + +trputc(c) { +#ifdef DEBUG + if (tracefile == NULL) + return; + putc(c, tracefile); + if (c == '\n') + fflush(tracefile); +#endif +} + + +trace(fmt, a1, a2, a3, a4, a5, a6, a7, a8) + char *fmt; + { +#ifdef DEBUG + if (tracefile == NULL) + return; + fprintf(tracefile, fmt, a1, a2, a3, a4, a5, a6, a7, a8); + if (strchr(fmt, '\n')) + fflush(tracefile); +#endif +} + + +trputs(s) + char *s; + { +#ifdef DEBUG + if (tracefile == NULL) + return; + fputs(s, tracefile); + if (strchr(s, '\n')) + fflush(tracefile); +#endif +} + + +trstring(s) + char *s; + { + register char *p; + char c; + +#ifdef DEBUG + 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); +#endif +} + + +trargs(ap) + char **ap; + { +#ifdef DEBUG + if (tracefile == NULL) + return; + while (*ap) { + trstring(*ap++); + if (*ap) + putc(' ', tracefile); + else + putc('\n', tracefile); + } + fflush(tracefile); +#endif +} + + +opentrace() { + char s[100]; + char *p; + char *getenv(); + int flags; + +#ifdef DEBUG + if (!debug) + return; +#ifdef not_this_way + if ((p = getenv("HOME")) == NULL) { + if (geteuid() == 0) + p = "/"; + else + p = "/tmp"; + } + scopy(p, s); + strcat(s, "/trace"); +#else + scopy("./trace", s); +#endif /* not_this_way */ + if ((tracefile = fopen(s, "a")) == NULL) { + fprintf(stderr, "Can't open %s\n", s); + return; + } +#ifdef O_APPEND + if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) + fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); +#endif + fputs("\nTracing started.\n", tracefile); + fflush(tracefile); +#endif /* DEBUG */ +} |