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-rw-r--r--contrib/nvi/ex/ex_write.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex_write.c b/contrib/nvi/ex/ex_write.c
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--- /dev/null
+++ b/contrib/nvi/ex/ex_write.c
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+/*-
+ * Copyright (c) 1992, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 1992, 1993, 1994, 1995, 1996
+ * Keith Bostic. All rights reserved.
+ *
+ * See the LICENSE file for redistribution information.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)ex_write.c 10.30 (Berkeley) 7/12/96";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+
+#include <bitstring.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../common/common.h"
+
+enum which {WN, WQ, WRITE, XIT};
+static int exwr __P((SCR *, EXCMD *, enum which));
+
+/*
+ * ex_wn -- :wn[!] [>>] [file]
+ * Write to a file and switch to the next one.
+ *
+ * PUBLIC: int ex_wn __P((SCR *, EXCMD *));
+ */
+int
+ex_wn(sp, cmdp)
+ SCR *sp;
+ EXCMD *cmdp;
+{
+ if (exwr(sp, cmdp, WN))
+ return (1);
+ if (file_m3(sp, 0))
+ return (1);
+
+ /* The file name isn't a new file to edit. */
+ cmdp->argc = 0;
+
+ return (ex_next(sp, cmdp));
+}
+
+/*
+ * ex_wq -- :wq[!] [>>] [file]
+ * Write to a file and quit.
+ *
+ * PUBLIC: int ex_wq __P((SCR *, EXCMD *));
+ */
+int
+ex_wq(sp, cmdp)
+ SCR *sp;
+ EXCMD *cmdp;
+{
+ int force;
+
+ if (exwr(sp, cmdp, WQ))
+ return (1);
+ if (file_m3(sp, 0))
+ return (1);
+
+ force = FL_ISSET(cmdp->iflags, E_C_FORCE);
+
+ if (ex_ncheck(sp, force))
+ return (1);
+
+ F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
+ return (0);
+}
+
+/*
+ * ex_write -- :write[!] [>>] [file]
+ * :write [!] [cmd]
+ * Write to a file.
+ *
+ * PUBLIC: int ex_write __P((SCR *, EXCMD *));
+ */
+int
+ex_write(sp, cmdp)
+ SCR *sp;
+ EXCMD *cmdp;
+{
+ return (exwr(sp, cmdp, WRITE));
+}
+
+
+/*
+ * ex_xit -- :x[it]! [file]
+ * Write out any modifications and quit.
+ *
+ * PUBLIC: int ex_xit __P((SCR *, EXCMD *));
+ */
+int
+ex_xit(sp, cmdp)
+ SCR *sp;
+ EXCMD *cmdp;
+{
+ int force;
+
+ NEEDFILE(sp, cmdp);
+
+ if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
+ return (1);
+ if (file_m3(sp, 0))
+ return (1);
+
+ force = FL_ISSET(cmdp->iflags, E_C_FORCE);
+
+ if (ex_ncheck(sp, force))
+ return (1);
+
+ F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
+ return (0);
+}
+
+/*
+ * exwr --
+ * The guts of the ex write commands.
+ */
+static int
+exwr(sp, cmdp, cmd)
+ SCR *sp;
+ EXCMD *cmdp;
+ enum which cmd;
+{
+ MARK rm;
+ int flags;
+ char *name, *p;
+
+ NEEDFILE(sp, cmdp);
+
+ /* All write commands can have an associated '!'. */
+ LF_INIT(FS_POSSIBLE);
+ if (FL_ISSET(cmdp->iflags, E_C_FORCE))
+ LF_SET(FS_FORCE);
+
+ /* Skip any leading whitespace. */
+ if (cmdp->argc != 0)
+ for (p = cmdp->argv[0]->bp; *p != '\0' && isblank(*p); ++p);
+
+ /* If "write !" it's a pipe to a utility. */
+ if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
+ /* Secure means no shell access. */
+ if (O_ISSET(sp, O_SECURE)) {
+ ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
+ return (1);
+ }
+
+ /* Expand the argument. */
+ for (++p; *p && isblank(*p); ++p);
+ if (*p == '\0') {
+ ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
+ return (1);
+ }
+ if (argv_exp1(sp, cmdp, p, strlen(p), 1))
+ return (1);
+
+ /*
+ * Historically, vi waited after a write filter even if there
+ * wasn't any output from the command. People complained when
+ * nvi waited only if there was output, wanting the visual cue
+ * that the program hadn't written anything.
+ */
+ F_SET(sp, SC_EX_WAIT_YES);
+
+ /*
+ * !!!
+ * Ignore the return cursor position, the cursor doesn't
+ * move.
+ */
+ if (ex_filter(sp, cmdp, &cmdp->addr1,
+ &cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
+ return (1);
+
+ /* Ex terminates with a bang, even if the command fails. */
+ if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
+ (void)ex_puts(sp, "!\n");
+
+ return (0);
+ }
+
+ /* Set the FS_ALL flag if we're writing the entire file. */
+ if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
+ LF_SET(FS_ALL);
+
+ /* If "write >>" it's an append to a file. */
+ if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
+ LF_SET(FS_APPEND);
+
+ /* Skip ">>" and whitespace. */
+ for (p += 2; *p && isblank(*p); ++p);
+ }
+
+ /* If no other arguments, just write the file back. */
+ if (cmdp->argc == 0 || *p == '\0')
+ return (file_write(sp,
+ &cmdp->addr1, &cmdp->addr2, NULL, flags));
+
+ /* Build an argv so we get an argument count and file expansion. */
+ if (argv_exp2(sp, cmdp, p, strlen(p)))
+ return (1);
+
+ /*
+ * 0 args: impossible.
+ * 1 args: impossible (I hope).
+ * 2 args: read it.
+ * >2 args: object, too many args.
+ *
+ * The 1 args case depends on the argv_sexp() function refusing
+ * to return success without at least one non-blank character.
+ */
+ switch (cmdp->argc) {
+ case 0:
+ case 1:
+ abort();
+ /* NOTREACHED */
+ case 2:
+ name = cmdp->argv[1]->bp;
+
+ /*
+ * !!!
+ * Historically, the read and write commands renamed
+ * "unnamed" files, or, if the file had a name, set
+ * the alternate file name.
+ */
+ if (F_ISSET(sp->frp, FR_TMPFILE) &&
+ !F_ISSET(sp->frp, FR_EXNAMED)) {
+ if ((p = v_strdup(sp,
+ cmdp->argv[1]->bp, cmdp->argv[1]->len)) != NULL) {
+ free(sp->frp->name);
+ sp->frp->name = p;
+ }
+ /*
+ * The file has a real name, it's no longer a
+ * temporary, clear the temporary file flags.
+ *
+ * !!!
+ * If we're writing the whole file, FR_NAMECHANGE
+ * will be cleared by the write routine -- this is
+ * historic practice.
+ */
+ F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
+ F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
+
+ /* Notify the screen. */
+ (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
+ } else
+ set_alt_name(sp, name);
+ break;
+ default:
+ ex_emsg(sp, p, EXM_FILECOUNT);
+ return (1);
+ }
+
+ return (file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags));
+}
+
+/*
+ * ex_writefp --
+ * Write a range of lines to a FILE *.
+ *
+ * PUBLIC: int ex_writefp __P((SCR *,
+ * PUBLIC: char *, FILE *, MARK *, MARK *, u_long *, u_long *, int));
+ */
+int
+ex_writefp(sp, name, fp, fm, tm, nlno, nch, silent)
+ SCR *sp;
+ char *name;
+ FILE *fp;
+ MARK *fm, *tm;
+ u_long *nlno, *nch;
+ int silent;
+{
+ struct stat sb;
+ GS *gp;
+ u_long ccnt; /* XXX: can't print off_t portably. */
+ recno_t fline, tline, lcnt;
+ size_t len;
+ int rval;
+ char *msg, *p;
+
+ gp = sp->gp;
+ fline = fm->lno;
+ tline = tm->lno;
+
+ if (nlno != NULL) {
+ *nch = 0;
+ *nlno = 0;
+ }
+
+ /*
+ * The vi filter code has multiple processes running simultaneously,
+ * and one of them calls ex_writefp(). The "unsafe" function calls
+ * in this code are to db_get() and msgq(). Db_get() is safe, see
+ * the comment in ex_filter.c:ex_filter() for details. We don't call
+ * msgq if the multiple process bit in the EXF is set.
+ *
+ * !!!
+ * Historic vi permitted files of 0 length to be written. However,
+ * since the way vi got around dealing with "empty" files was to
+ * always have a line in the file no matter what, it wrote them as
+ * files of a single, empty line. We write empty files.
+ *
+ * "Alex, I'll take vi trivia for $1000."
+ */
+ ccnt = 0;
+ lcnt = 0;
+ msg = "253|Writing...";
+ if (tline != 0)
+ for (; fline <= tline; ++fline, ++lcnt) {
+ /* Caller has to provide any interrupt message. */
+ if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
+ if (INTERRUPTED(sp))
+ break;
+ if (!silent) {
+ gp->scr_busy(sp, msg, msg == NULL ?
+ BUSY_UPDATE : BUSY_ON);
+ msg = NULL;
+ }
+ }
+ if (db_get(sp, fline, DBG_FATAL, &p, &len))
+ goto err;
+ if (fwrite(p, 1, len, fp) != len)
+ goto err;
+ ccnt += len;
+ if (putc('\n', fp) != '\n')
+ break;
+ ++ccnt;
+ }
+
+ if (fflush(fp))
+ goto err;
+ /*
+ * XXX
+ * I don't trust NFS -- check to make sure that we're talking to
+ * a regular file and sync so that NFS is forced to flush.
+ */
+ if (!fstat(fileno(fp), &sb) &&
+ S_ISREG(sb.st_mode) && fsync(fileno(fp)))
+ goto err;
+
+ if (fclose(fp))
+ goto err;
+
+ rval = 0;
+ if (0) {
+err: if (!F_ISSET(sp->ep, F_MULTILOCK))
+ msgq_str(sp, M_SYSERR, name, "%s");
+ (void)fclose(fp);
+ rval = 1;
+ }
+
+ if (!silent)
+ gp->scr_busy(sp, NULL, BUSY_OFF);
+
+ /* Report the possibly partial transfer. */
+ if (nlno != NULL) {
+ *nch = ccnt;
+ *nlno = lcnt;
+ }
+ return (rval);
+}
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