mirror of
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b8ba871bd9
files, curses, db, regex etc that we already have). The other glue will follow shortly. Obtained from: Keith Bostic <bostic@bostic.com>
757 lines
17 KiB
C
757 lines
17 KiB
C
/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)ex_argv.c 10.26 (Berkeley) 9/20/96";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../common/common.h"
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static int argv_alloc __P((SCR *, size_t));
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static int argv_comp __P((const void *, const void *));
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static int argv_fexp __P((SCR *, EXCMD *,
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char *, size_t, char *, size_t *, char **, size_t *, int));
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static int argv_lexp __P((SCR *, EXCMD *, char *));
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static int argv_sexp __P((SCR *, char **, size_t *, size_t *));
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/*
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* argv_init --
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* Build a prototype arguments list.
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*
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* PUBLIC: int argv_init __P((SCR *, EXCMD *));
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*/
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int
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argv_init(sp, excp)
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SCR *sp;
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EXCMD *excp;
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{
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EX_PRIVATE *exp;
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exp = EXP(sp);
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exp->argsoff = 0;
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argv_alloc(sp, 1);
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excp->argv = exp->args;
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excp->argc = exp->argsoff;
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return (0);
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}
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/*
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* argv_exp0 --
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* Append a string to the argument list.
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*
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* PUBLIC: int argv_exp0 __P((SCR *, EXCMD *, char *, size_t));
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*/
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int
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argv_exp0(sp, excp, cmd, cmdlen)
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SCR *sp;
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EXCMD *excp;
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char *cmd;
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size_t cmdlen;
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{
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EX_PRIVATE *exp;
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exp = EXP(sp);
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argv_alloc(sp, cmdlen);
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memcpy(exp->args[exp->argsoff]->bp, cmd, cmdlen);
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exp->args[exp->argsoff]->bp[cmdlen] = '\0';
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exp->args[exp->argsoff]->len = cmdlen;
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++exp->argsoff;
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excp->argv = exp->args;
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excp->argc = exp->argsoff;
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return (0);
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}
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/*
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* argv_exp1 --
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* Do file name expansion on a string, and append it to the
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* argument list.
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*
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* PUBLIC: int argv_exp1 __P((SCR *, EXCMD *, char *, size_t, int));
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*/
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int
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argv_exp1(sp, excp, cmd, cmdlen, is_bang)
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SCR *sp;
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EXCMD *excp;
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char *cmd;
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size_t cmdlen;
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int is_bang;
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{
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EX_PRIVATE *exp;
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size_t blen, len;
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char *bp, *p, *t;
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GET_SPACE_RET(sp, bp, blen, 512);
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len = 0;
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exp = EXP(sp);
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if (argv_fexp(sp, excp, cmd, cmdlen, bp, &len, &bp, &blen, is_bang)) {
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FREE_SPACE(sp, bp, blen);
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return (1);
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}
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/* If it's empty, we're done. */
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if (len != 0) {
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for (p = bp, t = bp + len; p < t; ++p)
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if (!isblank(*p))
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break;
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if (p == t)
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goto ret;
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} else
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goto ret;
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(void)argv_exp0(sp, excp, bp, len);
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ret: FREE_SPACE(sp, bp, blen);
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return (0);
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}
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/*
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* argv_exp2 --
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* Do file name and shell expansion on a string, and append it to
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* the argument list.
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*
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* PUBLIC: int argv_exp2 __P((SCR *, EXCMD *, char *, size_t));
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*/
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int
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argv_exp2(sp, excp, cmd, cmdlen)
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SCR *sp;
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EXCMD *excp;
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char *cmd;
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size_t cmdlen;
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{
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size_t blen, len, n;
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int rval;
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char *bp, *mp, *p;
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GET_SPACE_RET(sp, bp, blen, 512);
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#define SHELLECHO "echo "
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#define SHELLOFFSET (sizeof(SHELLECHO) - 1)
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memcpy(bp, SHELLECHO, SHELLOFFSET);
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p = bp + SHELLOFFSET;
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len = SHELLOFFSET;
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#if defined(DEBUG) && 0
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TRACE(sp, "file_argv: {%.*s}\n", (int)cmdlen, cmd);
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#endif
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if (argv_fexp(sp, excp, cmd, cmdlen, p, &len, &bp, &blen, 0)) {
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rval = 1;
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goto err;
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}
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#if defined(DEBUG) && 0
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TRACE(sp, "before shell: %d: {%s}\n", len, bp);
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#endif
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/*
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* Do shell word expansion -- it's very, very hard to figure out what
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* magic characters the user's shell expects. Historically, it was a
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* union of v7 shell and csh meta characters. We match that practice
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* by default, so ":read \%" tries to read a file named '%'. It would
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* make more sense to pass any special characters through the shell,
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* but then, if your shell was csh, the above example will behave
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* differently in nvi than in vi. If you want to get other characters
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* passed through to your shell, change the "meta" option.
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*
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* To avoid a function call per character, we do a first pass through
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* the meta characters looking for characters that aren't expected
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* to be there, and then we can ignore them in the user's argument.
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*/
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if (opts_empty(sp, O_SHELL, 1) || opts_empty(sp, O_SHELLMETA, 1))
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n = 0;
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else {
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for (p = mp = O_STR(sp, O_SHELLMETA); *p != '\0'; ++p)
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if (isblank(*p) || isalnum(*p))
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break;
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p = bp + SHELLOFFSET;
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n = len - SHELLOFFSET;
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if (*p != '\0') {
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for (; n > 0; --n, ++p)
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if (strchr(mp, *p) != NULL)
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break;
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} else
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for (; n > 0; --n, ++p)
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if (!isblank(*p) &&
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!isalnum(*p) && strchr(mp, *p) != NULL)
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break;
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}
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/*
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* If we found a meta character in the string, fork a shell to expand
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* it. Unfortunately, this is comparatively slow. Historically, it
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* didn't matter much, since users don't enter meta characters as part
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* of pathnames that frequently. The addition of filename completion
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* broke that assumption because it's easy to use. As a result, lots
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* folks have complained that the expansion code is too slow. So, we
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* detect filename completion as a special case, and do it internally.
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* Note that this code assumes that the <asterisk> character is the
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* match-anything meta character. That feels safe -- if anyone writes
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* a shell that doesn't follow that convention, I'd suggest giving them
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* a festive hot-lead enema.
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*/
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switch (n) {
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case 0:
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p = bp + SHELLOFFSET;
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len -= SHELLOFFSET;
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rval = argv_exp3(sp, excp, p, len);
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break;
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case 1:
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if (*p == '*') {
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*p = '\0';
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rval = argv_lexp(sp, excp, bp + SHELLOFFSET);
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break;
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}
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/* FALLTHROUGH */
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default:
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if (argv_sexp(sp, &bp, &blen, &len)) {
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rval = 1;
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goto err;
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}
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p = bp;
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rval = argv_exp3(sp, excp, p, len);
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break;
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}
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err: FREE_SPACE(sp, bp, blen);
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return (rval);
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}
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/*
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* argv_exp3 --
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* Take a string and break it up into an argv, which is appended
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* to the argument list.
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*
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* PUBLIC: int argv_exp3 __P((SCR *, EXCMD *, char *, size_t));
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*/
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int
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argv_exp3(sp, excp, cmd, cmdlen)
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SCR *sp;
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EXCMD *excp;
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char *cmd;
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size_t cmdlen;
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{
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EX_PRIVATE *exp;
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size_t len;
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int ch, off;
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char *ap, *p;
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for (exp = EXP(sp); cmdlen > 0; ++exp->argsoff) {
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/* Skip any leading whitespace. */
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for (; cmdlen > 0; --cmdlen, ++cmd) {
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ch = *cmd;
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if (!isblank(ch))
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break;
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}
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if (cmdlen == 0)
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break;
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/*
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* Determine the length of this whitespace delimited
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* argument.
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*
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* QUOTING NOTE:
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*
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* Skip any character preceded by the user's quoting
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* character.
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*/
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for (ap = cmd, len = 0; cmdlen > 0; ++cmd, --cmdlen, ++len) {
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ch = *cmd;
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if (IS_ESCAPE(sp, excp, ch) && cmdlen > 1) {
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++cmd;
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--cmdlen;
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} else if (isblank(ch))
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break;
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}
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/*
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* Copy the argument into place.
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*
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* QUOTING NOTE:
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*
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* Lose quote chars.
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*/
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argv_alloc(sp, len);
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off = exp->argsoff;
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exp->args[off]->len = len;
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for (p = exp->args[off]->bp; len > 0; --len, *p++ = *ap++)
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if (IS_ESCAPE(sp, excp, *ap))
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++ap;
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*p = '\0';
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}
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excp->argv = exp->args;
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excp->argc = exp->argsoff;
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#if defined(DEBUG) && 0
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for (cnt = 0; cnt < exp->argsoff; ++cnt)
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TRACE(sp, "arg %d: {%s}\n", cnt, exp->argv[cnt]);
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#endif
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return (0);
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}
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/*
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* argv_fexp --
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* Do file name and bang command expansion.
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*/
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static int
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argv_fexp(sp, excp, cmd, cmdlen, p, lenp, bpp, blenp, is_bang)
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SCR *sp;
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EXCMD *excp;
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char *cmd, *p, **bpp;
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size_t cmdlen, *lenp, *blenp;
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int is_bang;
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{
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EX_PRIVATE *exp;
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char *bp, *t;
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size_t blen, len, off, tlen;
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/* Replace file name characters. */
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for (bp = *bpp, blen = *blenp, len = *lenp; cmdlen > 0; --cmdlen, ++cmd)
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switch (*cmd) {
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case '!':
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if (!is_bang)
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goto ins_ch;
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exp = EXP(sp);
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if (exp->lastbcomm == NULL) {
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msgq(sp, M_ERR,
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"115|No previous command to replace \"!\"");
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return (1);
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}
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len += tlen = strlen(exp->lastbcomm);
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off = p - bp;
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ADD_SPACE_RET(sp, bp, blen, len);
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p = bp + off;
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memcpy(p, exp->lastbcomm, tlen);
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p += tlen;
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F_SET(excp, E_MODIFY);
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break;
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case '%':
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if ((t = sp->frp->name) == NULL) {
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msgq(sp, M_ERR,
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"116|No filename to substitute for %%");
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return (1);
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}
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tlen = strlen(t);
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len += tlen;
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off = p - bp;
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ADD_SPACE_RET(sp, bp, blen, len);
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p = bp + off;
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memcpy(p, t, tlen);
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p += tlen;
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F_SET(excp, E_MODIFY);
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break;
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case '#':
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if ((t = sp->alt_name) == NULL) {
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msgq(sp, M_ERR,
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"117|No filename to substitute for #");
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return (1);
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}
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len += tlen = strlen(t);
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off = p - bp;
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ADD_SPACE_RET(sp, bp, blen, len);
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p = bp + off;
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memcpy(p, t, tlen);
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p += tlen;
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F_SET(excp, E_MODIFY);
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break;
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case '\\':
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/*
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* QUOTING NOTE:
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*
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* Strip any backslashes that protected the file
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* expansion characters.
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*/
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if (cmdlen > 1 &&
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(cmd[1] == '%' || cmd[1] == '#' || cmd[1] == '!')) {
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++cmd;
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--cmdlen;
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}
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/* FALLTHROUGH */
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default:
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ins_ch: ++len;
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off = p - bp;
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ADD_SPACE_RET(sp, bp, blen, len);
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p = bp + off;
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*p++ = *cmd;
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}
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/* Nul termination. */
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++len;
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off = p - bp;
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ADD_SPACE_RET(sp, bp, blen, len);
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p = bp + off;
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*p = '\0';
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/* Return the new string length, buffer, buffer length. */
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*lenp = len - 1;
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*bpp = bp;
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*blenp = blen;
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return (0);
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}
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/*
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* argv_alloc --
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* Make more space for arguments.
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*/
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static int
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argv_alloc(sp, len)
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SCR *sp;
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size_t len;
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{
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ARGS *ap;
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EX_PRIVATE *exp;
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int cnt, off;
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/*
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* Allocate room for another argument, always leaving
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* enough room for an ARGS structure with a length of 0.
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*/
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#define INCREMENT 20
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exp = EXP(sp);
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off = exp->argsoff;
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if (exp->argscnt == 0 || off + 2 >= exp->argscnt - 1) {
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cnt = exp->argscnt + INCREMENT;
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REALLOC(sp, exp->args, ARGS **, cnt * sizeof(ARGS *));
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if (exp->args == NULL) {
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(void)argv_free(sp);
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goto mem;
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}
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memset(&exp->args[exp->argscnt], 0, INCREMENT * sizeof(ARGS *));
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exp->argscnt = cnt;
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}
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/* First argument. */
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if (exp->args[off] == NULL) {
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CALLOC(sp, exp->args[off], ARGS *, 1, sizeof(ARGS));
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if (exp->args[off] == NULL)
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goto mem;
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}
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/* First argument buffer. */
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ap = exp->args[off];
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ap->len = 0;
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if (ap->blen < len + 1) {
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ap->blen = len + 1;
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REALLOC(sp, ap->bp, CHAR_T *, ap->blen * sizeof(CHAR_T));
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if (ap->bp == NULL) {
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ap->bp = NULL;
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ap->blen = 0;
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F_CLR(ap, A_ALLOCATED);
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mem: msgq(sp, M_SYSERR, NULL);
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return (1);
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}
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F_SET(ap, A_ALLOCATED);
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}
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/* Second argument. */
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if (exp->args[++off] == NULL) {
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CALLOC(sp, exp->args[off], ARGS *, 1, sizeof(ARGS));
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if (exp->args[off] == NULL)
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goto mem;
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}
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/* 0 length serves as end-of-argument marker. */
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exp->args[off]->len = 0;
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return (0);
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}
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/*
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* argv_free --
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* Free up argument structures.
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*
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* PUBLIC: int argv_free __P((SCR *));
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*/
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int
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argv_free(sp)
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SCR *sp;
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{
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EX_PRIVATE *exp;
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int off;
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exp = EXP(sp);
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if (exp->args != NULL) {
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for (off = 0; off < exp->argscnt; ++off) {
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if (exp->args[off] == NULL)
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continue;
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if (F_ISSET(exp->args[off], A_ALLOCATED))
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free(exp->args[off]->bp);
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free(exp->args[off]);
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}
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free(exp->args);
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}
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exp->args = NULL;
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exp->argscnt = 0;
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exp->argsoff = 0;
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return (0);
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}
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/*
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* argv_lexp --
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* Find all file names matching the prefix and append them to the
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* buffer.
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*/
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static int
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argv_lexp(sp, excp, path)
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SCR *sp;
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EXCMD *excp;
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char *path;
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{
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struct dirent *dp;
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DIR *dirp;
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EX_PRIVATE *exp;
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int off;
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size_t dlen, len, nlen;
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char *dname, *name, *p;
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exp = EXP(sp);
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/* Set up the name and length for comparison. */
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if ((p = strrchr(path, '/')) == NULL) {
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dname = ".";
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dlen = 0;
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name = path;
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} else {
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if (p == path) {
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dname = "/";
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dlen = 1;
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} else {
|
|
*p = '\0';
|
|
dname = path;
|
|
dlen = strlen(path);
|
|
}
|
|
name = p + 1;
|
|
}
|
|
nlen = strlen(name);
|
|
|
|
/*
|
|
* XXX
|
|
* We don't use the d_namlen field, it's not portable enough; we
|
|
* assume that d_name is nul terminated, instead.
|
|
*/
|
|
if ((dirp = opendir(dname)) == NULL) {
|
|
msgq_str(sp, M_SYSERR, dname, "%s");
|
|
return (1);
|
|
}
|
|
for (off = exp->argsoff; (dp = readdir(dirp)) != NULL;) {
|
|
if (nlen == 0) {
|
|
if (dp->d_name[0] == '.')
|
|
continue;
|
|
len = strlen(dp->d_name);
|
|
} else {
|
|
len = strlen(dp->d_name);
|
|
if (len < nlen || memcmp(dp->d_name, name, nlen))
|
|
continue;
|
|
}
|
|
|
|
/* Directory + name + slash + null. */
|
|
argv_alloc(sp, dlen + len + 2);
|
|
p = exp->args[exp->argsoff]->bp;
|
|
if (dlen != 0) {
|
|
memcpy(p, dname, dlen);
|
|
p += dlen;
|
|
if (dlen > 1 || dname[0] != '/')
|
|
*p++ = '/';
|
|
}
|
|
memcpy(p, dp->d_name, len + 1);
|
|
exp->args[exp->argsoff]->len = dlen + len + 1;
|
|
++exp->argsoff;
|
|
excp->argv = exp->args;
|
|
excp->argc = exp->argsoff;
|
|
}
|
|
closedir(dirp);
|
|
|
|
if (off == exp->argsoff) {
|
|
/*
|
|
* If we didn't find a match, complain that the expansion
|
|
* failed. We can't know for certain that's the error, but
|
|
* it's a good guess, and it matches historic practice.
|
|
*/
|
|
msgq(sp, M_ERR, "304|Shell expansion failed");
|
|
return (1);
|
|
}
|
|
qsort(exp->args + off, exp->argsoff - off, sizeof(ARGS *), argv_comp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* argv_comp --
|
|
* Alphabetic comparison.
|
|
*/
|
|
static int
|
|
argv_comp(a, b)
|
|
const void *a, *b;
|
|
{
|
|
return (strcmp((char *)(*(ARGS **)a)->bp, (char *)(*(ARGS **)b)->bp));
|
|
}
|
|
|
|
/*
|
|
* argv_sexp --
|
|
* Fork a shell, pipe a command through it, and read the output into
|
|
* a buffer.
|
|
*/
|
|
static int
|
|
argv_sexp(sp, bpp, blenp, lenp)
|
|
SCR *sp;
|
|
char **bpp;
|
|
size_t *blenp, *lenp;
|
|
{
|
|
enum { SEXP_ERR, SEXP_EXPANSION_ERR, SEXP_OK } rval;
|
|
FILE *ifp;
|
|
pid_t pid;
|
|
size_t blen, len;
|
|
int ch, std_output[2];
|
|
char *bp, *p, *sh, *sh_path;
|
|
|
|
/* Secure means no shell access. */
|
|
if (O_ISSET(sp, O_SECURE)) {
|
|
msgq(sp, M_ERR,
|
|
"289|Shell expansions not supported when the secure edit option is set");
|
|
return (1);
|
|
}
|
|
|
|
sh_path = O_STR(sp, O_SHELL);
|
|
if ((sh = strrchr(sh_path, '/')) == NULL)
|
|
sh = sh_path;
|
|
else
|
|
++sh;
|
|
|
|
/* Local copies of the buffer variables. */
|
|
bp = *bpp;
|
|
blen = *blenp;
|
|
|
|
/*
|
|
* There are two different processes running through this code, named
|
|
* the utility (the shell) and the parent. The utility reads standard
|
|
* input and writes standard output and standard error output. The
|
|
* parent writes to the utility, reads its standard output and ignores
|
|
* its standard error output. Historically, the standard error output
|
|
* was discarded by vi, as it produces a lot of noise when file patterns
|
|
* don't match.
|
|
*
|
|
* The parent reads std_output[0], and the utility writes std_output[1].
|
|
*/
|
|
ifp = NULL;
|
|
std_output[0] = std_output[1] = -1;
|
|
if (pipe(std_output) < 0) {
|
|
msgq(sp, M_SYSERR, "pipe");
|
|
return (1);
|
|
}
|
|
if ((ifp = fdopen(std_output[0], "r")) == NULL) {
|
|
msgq(sp, M_SYSERR, "fdopen");
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Do the minimal amount of work possible, the shell is going to run
|
|
* briefly and then exit. We sincerely hope.
|
|
*/
|
|
switch (pid = vfork()) {
|
|
case -1: /* Error. */
|
|
msgq(sp, M_SYSERR, "vfork");
|
|
err: if (ifp != NULL)
|
|
(void)fclose(ifp);
|
|
else if (std_output[0] != -1)
|
|
close(std_output[0]);
|
|
if (std_output[1] != -1)
|
|
close(std_output[0]);
|
|
return (1);
|
|
case 0: /* Utility. */
|
|
/* Redirect stdout to the write end of the pipe. */
|
|
(void)dup2(std_output[1], STDOUT_FILENO);
|
|
|
|
/* Close the utility's file descriptors. */
|
|
(void)close(std_output[0]);
|
|
(void)close(std_output[1]);
|
|
(void)close(STDERR_FILENO);
|
|
|
|
/*
|
|
* XXX
|
|
* Assume that all shells have -c.
|
|
*/
|
|
execl(sh_path, sh, "-c", bp, NULL);
|
|
msgq_str(sp, M_SYSERR, sh_path, "118|Error: execl: %s");
|
|
_exit(127);
|
|
default: /* Parent. */
|
|
/* Close the pipe ends the parent won't use. */
|
|
(void)close(std_output[1]);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Copy process standard output into a buffer.
|
|
*
|
|
* !!!
|
|
* Historic vi apparently discarded leading \n and \r's from
|
|
* the shell output stream. We don't on the grounds that any
|
|
* shell that does that is broken.
|
|
*/
|
|
for (p = bp, len = 0, ch = EOF;
|
|
(ch = getc(ifp)) != EOF; *p++ = ch, --blen, ++len)
|
|
if (blen < 5) {
|
|
ADD_SPACE_GOTO(sp, bp, *blenp, *blenp * 2);
|
|
p = bp + len;
|
|
blen = *blenp - len;
|
|
}
|
|
|
|
/* Delete the final newline, nul terminate the string. */
|
|
if (p > bp && (p[-1] == '\n' || p[-1] == '\r')) {
|
|
--p;
|
|
--len;
|
|
}
|
|
*p = '\0';
|
|
*lenp = len;
|
|
*bpp = bp; /* *blenp is already updated. */
|
|
|
|
if (ferror(ifp))
|
|
goto ioerr;
|
|
if (fclose(ifp)) {
|
|
ioerr: msgq_str(sp, M_ERR, sh, "119|I/O error: %s");
|
|
alloc_err: rval = SEXP_ERR;
|
|
} else
|
|
rval = SEXP_OK;
|
|
|
|
/*
|
|
* Wait for the process. If the shell process fails (e.g., "echo $q"
|
|
* where q wasn't a defined variable) or if the returned string has
|
|
* no characters or only blank characters, (e.g., "echo $5"), complain
|
|
* that the shell expansion failed. We can't know for certain that's
|
|
* the error, but it's a good guess, and it matches historic practice.
|
|
* This won't catch "echo foo_$5", but that's not a common error and
|
|
* historic vi didn't catch it either.
|
|
*/
|
|
if (proc_wait(sp, (long)pid, sh, 1, 0))
|
|
rval = SEXP_EXPANSION_ERR;
|
|
|
|
for (p = bp; len; ++p, --len)
|
|
if (!isblank(*p))
|
|
break;
|
|
if (len == 0)
|
|
rval = SEXP_EXPANSION_ERR;
|
|
|
|
if (rval == SEXP_EXPANSION_ERR)
|
|
msgq(sp, M_ERR, "304|Shell expansion failed");
|
|
|
|
return (rval == SEXP_OK ? 0 : 1);
|
|
}
|