usr.bin/vi/nex/ex_read.c

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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[] = "@(#)ex_read.c   8.21 (Berkeley) 1/23/94";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "vi.h"
#include "excmd.h"

/*
 * ex_read --   :read [file]
 *              :read [! cmd]
 *      Read from a file or utility.
 */
int
ex_read(sp, ep, cmdp)
        SCR *sp;
        EXF *ep;
        EXCMDARG *cmdp;
{
        struct stat sb;
        FILE *fp;
        MARK rm;
        recno_t nlines;
        size_t blen, len;
        int rval;
        char *bp, *name;

        /*
         * If "read !", it's a pipe from a utility.
         *
         * !!!
         * Historical vi wouldn't undo a filter read, for no apparent
         * reason.
         */
        if (F_ISSET(cmdp, E_FORCE)) {
                /* Expand the user's argument. */
                if (argv_exp1(sp, ep,
                    cmdp, cmdp->argv[0]->bp, cmdp->argv[0]->len, 0))
                        return (1);

                /* If argc still 1, there wasn't anything to expand. */
                if (cmdp->argc == 1) {
                        msgq(sp, M_ERR, "Usage: %s.", cmdp->cmd->usage);
                        return (1);
                }

                /* Redisplay the user's argument if it's changed. */
                if (F_ISSET(cmdp, E_MODIFY) && IN_VI_MODE(sp)) {
                        len = cmdp->argv[1]->len;
                        GET_SPACE_RET(sp, bp, blen, len + 2);
                        bp[0] = '!';
                        memmove(bp + 1, cmdp->argv[1], cmdp->argv[1]->len + 1);
                        (void)sp->s_busy(sp, bp);
                        FREE_SPACE(sp, bp, blen);
                }

                if (filtercmd(sp, ep,
                    &cmdp->addr1, NULL, &rm, cmdp->argv[1]->bp, FILTER_READ))
                        return (1);
                sp->lno = rm.lno;
                return (0);
        }

        /* Expand the user's argument. */
        if (argv_exp2(sp, ep,
            cmdp, cmdp->argv[0]->bp, cmdp->argv[0]->len, 0))
                return (1);

        switch (cmdp->argc) {
        case 1:
                /*
                 * No arguments, read the current file.
                 * Doesn't set the alternate file name.
                 */
                name = FILENAME(sp->frp);
                break;
        case 2:
                /*
                 * One argument, read it.
                 * Sets the alternate file name.
                 */
                name = cmdp->argv[1]->bp;
                set_alt_name(sp, name);
                break;
        default:
                /* If expanded to more than one argument, object. */
                msgq(sp, M_ERR,
                    "%s expanded into too many file names", cmdp->argv[0]->bp);
                msgq(sp, M_ERR, "Usage: %s.", cmdp->cmd->usage);
                return (1);
        }

        /*
         * !!!
         * Historically, vi did not permit reads from non-regular files,
         * nor did it distinguish between "read !" and "read!", so there
         * was no way to "force" it.
         */
        if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) {
                msgq(sp, M_SYSERR, name);
                return (1);
        }
        if (!S_ISREG(sb.st_mode)) {
                (void)fclose(fp);
                msgq(sp, M_ERR, "Only regular files may be read.");
                return (1);
        }

        rval = ex_readfp(sp, ep, name, fp, &cmdp->addr1, &nlines, 1);

        /*
         * Set the cursor to the first line read in, if anything read
         * in, otherwise, the address.  (Historic vi set it to the
         * line after the address regardless, but since that line may
         * not exist we don't bother.)
         */
        sp->lno = cmdp->addr1.lno;
        if (nlines)
                ++sp->lno;

        F_SET(EXP(sp), EX_AUTOPRINT);
        return (rval);
}

/*
 * ex_readfp --
 *      Read lines into the file.
 */
int
ex_readfp(sp, ep, name, fp, fm, nlinesp, success_msg)
        SCR *sp;
        EXF *ep;
        char *name;
        FILE *fp;
        MARK *fm;
        recno_t *nlinesp;
        int success_msg;
{
        EX_PRIVATE *exp;
        u_long ccnt;
        size_t len;
        recno_t lno, nlines;
        int rval;

        /*
         * Add in the lines from the output.  Insertion starts at the line
         * following the address.
         */
        ccnt = 0;
        rval = 0;
        exp = EXP(sp);
        for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno) {
                if (file_aline(sp, ep, 1, lno, exp->ibp, len)) {
                        rval = 1;
                        break;
                }
                ccnt += len;
        }

        if (ferror(fp)) {
                msgq(sp, M_SYSERR, name);
                rval = 1;
        }

        if (fclose(fp)) {
                msgq(sp, M_SYSERR, name);
                return (1);
        }

        if (rval)
                return (1);

        /* Return the number of lines read in. */
        nlines = lno - fm->lno;
        if (nlinesp != NULL)
                *nlinesp = nlines;

        if (success_msg)
                msgq(sp, M_INFO, "%s: %lu line%s, %lu characters.",
                    name, nlines, nlines == 1 ? "" : "s", ccnt);

        return (0);
}