NetBSD/usr.bin/vi/util.c

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/*-
* Copyright (c) 1991, 1993, 1994
* 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[] = "@(#)util.c 8.44 (Berkeley) 3/15/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <curses.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
/*
* msgq --
* Display a message.
*/
void
#ifdef __STDC__
msgq(SCR *sp, enum msgtype mt, const char *fmt, ...)
#else
msgq(sp, mt, fmt, va_alist)
SCR *sp;
enum msgtype mt;
char *fmt;
va_dcl
#endif
{
va_list ap;
int len;
char msgbuf[1024];
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
/*
* It's possible to enter msg when there's no screen to hold
* the message. Always check sp before using it, and, if it's
* NULL, use __global_list.
*/
switch (mt) {
case M_BERR:
if (sp != NULL && !F_ISSET(sp, S_EXSILENT) &&
F_ISSET(sp->gp, G_STDIN_TTY) && !O_ISSET(sp, O_VERBOSE)) {
F_SET(sp, S_BELLSCHED);
return;
}
mt = M_ERR;
break;
case M_VINFO:
if (sp == NULL || !O_ISSET(sp, O_VERBOSE))
return;
mt = M_INFO;
/* FALLTHROUGH */
case M_INFO:
if (F_ISSET(sp, S_EXSILENT))
return;
break;
case M_ERR:
case M_SYSERR:
break;
default:
abort();
}
/* Length is the min length of the message or the buffer. */
if (mt == M_SYSERR)
if (sp->if_name != NULL)
len = snprintf(msgbuf, sizeof(msgbuf),
"Error: %s, %d: %s%s%s.", sp->if_name, sp->if_lno,
fmt == NULL ? "" : fmt, fmt == NULL ? "" : ": ",
strerror(errno));
else
len = snprintf(msgbuf, sizeof(msgbuf),
"Error: %s%s%s.",
fmt == NULL ? "" : fmt, fmt == NULL ? "" : ": ",
strerror(errno));
else {
len = sp->if_name == NULL ? 0 : snprintf(msgbuf, sizeof(msgbuf),
"%s, %d: ", sp->if_name, sp->if_lno);
len += vsnprintf(msgbuf + len, sizeof(msgbuf) - len, fmt, ap);
}
/*
* If len >= the size, some characters were discarded.
* Ignore trailing nul.
*/
if (len >= sizeof(msgbuf))
len = sizeof(msgbuf) - 1;
msg_app(__global_list, sp, mt == M_ERR ? 1 : 0, msgbuf, len);
}
/*
* msg_app --
* Append a message into the queue. This can fail, but there's
* nothing we can do if it does.
*/
void
msg_app(gp, sp, inv_video, p, len)
GS *gp;
SCR *sp;
int inv_video;
char *p;
size_t len;
{
static int reenter; /* STATIC: Re-entrancy check. */
MSG *mp, *nmp;
/*
* It's possible to reenter msg when it allocates space.
* We're probably dead anyway, but no reason to drop core.
*/
if (reenter)
return;
reenter = 1;
/*
* Find an empty structure, or allocate a new one. Use the
* screen structure if possible, otherwise the global one.
*/
if (sp != NULL) {
if ((mp = sp->msgq.lh_first) == NULL) {
CALLOC(sp, mp, MSG *, 1, sizeof(MSG));
if (mp == NULL)
goto ret;
LIST_INSERT_HEAD(&sp->msgq, mp, q);
goto store;
}
} else if ((mp = gp->msgq.lh_first) == NULL) {
CALLOC(sp, mp, MSG *, 1, sizeof(MSG));
if (mp == NULL)
goto ret;
LIST_INSERT_HEAD(&gp->msgq, mp, q);
goto store;
}
while (!F_ISSET(mp, M_EMPTY) && mp->q.le_next != NULL)
mp = mp->q.le_next;
if (!F_ISSET(mp, M_EMPTY)) {
CALLOC(sp, nmp, MSG *, 1, sizeof(MSG));
if (nmp == NULL)
goto ret;
LIST_INSERT_AFTER(mp, nmp, q);
mp = nmp;
}
/* Get enough memory for the message. */
store: if (len > mp->blen && binc(sp, &mp->mbuf, &mp->blen, len))
goto ret;
/* Store the message. */
memmove(mp->mbuf, p, len);
mp->len = len;
mp->flags = inv_video ? M_INV_VIDEO : 0;
ret: reenter = 0;
}
/*
* msgrpt --
* Report on the lines that changed.
*
* !!!
* Historic vi documentation (USD:15-8) claimed that "The editor will also
* always tell you when a change you make affects text which you cannot see."
* This isn't true -- edit a large file and do "100d|1". We don't implement
* this semantic as it would require that we track each line that changes
* during a command instead of just keeping count.
*
* Line counts weren't right in historic vi, either. For example, given the
* file:
* abc
* def
* the command 2d}, from the 'b' would report that two lines were deleted,
* not one.
*/
int
msg_rpt(sp, is_message)
SCR *sp;
int is_message;
{
static const char *const action[] = {
"added", "changed", "copied", "deleted", "joined", "moved",
"put", "left shifted", "right shifted", "yanked", NULL,
};
recno_t total;
u_long rval;
int first, cnt;
size_t blen, len;
const char *const *ap;
char *bp, *p, number[40];
if (F_ISSET(sp, S_EXSILENT))
return (0);
if ((rval = O_VAL(sp, O_REPORT)) == 0)
goto norpt;
GET_SPACE_RET(sp, bp, blen, 512);
p = bp;
total = 0;
for (ap = action, cnt = 0, first = 1; *ap != NULL; ++ap, ++cnt)
if (sp->rptlines[cnt] != 0) {
total += sp->rptlines[cnt];
len = snprintf(number, sizeof(number),
"%s%lu line%s %s", first ? "" : "; ",
sp->rptlines[cnt],
sp->rptlines[cnt] > 1 ? "s" : "", *ap);
memmove(p, number, len);
p += len;
first = 0;
}
/*
* If nothing to report, return. Note that the number of lines
* must be > than the user's value, not >=. This is historic
* practice and means that users cannot report on single line
* changes.
*/
if (total > rval) {
*p = '\0';
if (is_message)
msgq(sp, M_INFO, "%s", bp);
else
ex_printf(EXCOOKIE, "%s\n", bp);
}
FREE_SPACE(sp, bp, blen);
/* Clear after each report. */
norpt: memset(sp->rptlines, 0, sizeof(sp->rptlines));
return (0);
}
/*
* binc --
* Increase the size of a buffer.
*/
int
binc(sp, argp, bsizep, min)
SCR *sp; /* sp MAY BE NULL!!! */
void *argp;
size_t *bsizep, min;
{
size_t csize;
void *bpp;
/* If already larger than the minimum, just return. */
if (min && *bsizep >= min)
return (0);
/*
* If the initial pointer is null, use calloc (for non-ANSI
* C realloc implementations).
*/
bpp = *(char **)argp;
csize = *bsizep + MAX(min, 256);
if (bpp == NULL) {
MALLOC(sp, bpp, void *, csize);
} else
REALLOC(sp, bpp, void *, csize);
if (bpp == NULL) {
/*
* Theoretically, realloc is supposed to leave any already
* held memory alone if it can't get more. Don't trust it.
*/
*bsizep = 0;
return (1);
}
/*
* Memory is guaranteed to be zero-filled, various parts of
* nvi depend on this.
*/
memset((char *)bpp + *bsizep, 0, csize - *bsizep);
*(char **)argp = bpp;
*bsizep = csize;
return (0);
}
/*
* nonblank --
* Set the column number of the first non-blank character
* including or after the starting column. On error, set
* the column to 0, it's safest.
*/
int
nonblank(sp, ep, lno, cnop)
SCR *sp;
EXF *ep;
recno_t lno;
size_t *cnop;
{
char *p;
size_t cnt, len, off;
/* Default. */
off = *cnop;
*cnop = 0;
/* Get the line. */
if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
if (file_lline(sp, ep, &lno))
return (1);
if (lno == 0)
return (0);
GETLINE_ERR(sp, lno);
return (1);
}
/* Set the offset. */
if (len == 0 || off >= len)
return (0);
for (cnt = off, p = &p[off],
len -= off; len && isblank(*p); ++cnt, ++p, --len);
/* Set the return. */
*cnop = len ? cnt : cnt - 1;
return (0);
}
/*
* tail --
* Return tail of a path.
*/
char *
tail(path)
char *path;
{
char *p;
if ((p = strrchr(path, '/')) == NULL)
return (path);
return (p + 1);
}
/*
* set_window_size --
* Set the window size, the row may be provided as an argument.
*/
int
set_window_size(sp, set_row, ign_env)
SCR *sp;
u_int set_row;
int ign_env;
{
struct winsize win;
size_t col, row;
int user_set;
ARGS *argv[2], a, b;
char *s, buf[2048];
/*
* Get the screen rows and columns. If the values are wrong, it's
* not a big deal -- as soon as the user sets them explicitly the
* environment will be set and the screen package will use the new
* values.
*
* Try TIOCGWINSZ.
*/
row = col = 0;
#ifdef TIOCGWINSZ
if (ioctl(STDERR_FILENO, TIOCGWINSZ, &win) != -1) {
row = win.ws_row;
col = win.ws_col;
}
#endif
/* If TIOCGWINSZ failed, or had entries of 0, try termcap. */
if (row == 0 || col == 0) {
s = NULL;
if (F_ISSET(&sp->opts[O_TERM], OPT_SET))
s = O_STR(sp, O_TERM);
else
s = getenv("TERM");
if (s != NULL && tgetent(buf, s) == 1) {
if (row == 0)
row = tgetnum("li");
if (col == 0)
col = tgetnum("co");
}
}
/* If nothing else, well, it's probably a VT100. */
if (row == 0)
row = 24;
if (col == 0)
col = 80;
/*
* POSIX 1003.2 requires the environment to override, however,
* if we're here because of a signal, we don't want to use the
* old values.
*/
if (!ign_env) {
if ((s = getenv("LINES")) != NULL)
row = strtol(s, NULL, 10);
if ((s = getenv("COLUMNS")) != NULL)
col = strtol(s, NULL, 10);
}
/* But, if we got an argument for the rows, use it. */
if (set_row)
row = set_row;
a.bp = buf;
b.bp = NULL;
b.len = 0;
argv[0] = &a;
argv[1] = &b;;
/*
* Tell the options code that the screen size has changed.
* Since the user didn't do the set, clear the set bits.
*/
user_set = F_ISSET(&sp->opts[O_LINES], OPT_SET);
a.len = snprintf(buf, sizeof(buf), "lines=%u", row);
if (opts_set(sp, argv))
return (1);
if (user_set)
F_CLR(&sp->opts[O_LINES], OPT_SET);
user_set = F_ISSET(&sp->opts[O_COLUMNS], OPT_SET);
a.len = snprintf(buf, sizeof(buf), "columns=%u", col);
if (opts_set(sp, argv))
return (1);
if (user_set)
F_CLR(&sp->opts[O_COLUMNS], OPT_SET);
return (0);
}
/*
* set_alt_name --
* Set the alternate file name.
*
* Swap the alternate file name. It's a routine because I wanted some place
* to hang this comment. The alternate file name (normally referenced using
* the special character '#' during file expansion) is set by many
* operations. In the historic vi, the commands "ex", and "edit" obviously
* set the alternate file name because they switched the underlying file.
* Less obviously, the "read", "file", "write" and "wq" commands set it as
* well. In this implementation, some new commands have been added to the
* list. Where it gets interesting is that the alternate file name is set
* multiple times by some commands. If an edit attempt fails (for whatever
* reason, like the current file is modified but as yet unwritten), it is
* set to the file name that the user was unable to edit. If the edit
* succeeds, it is set to the last file name that was edited. Good fun.
*
* If the user edits a temporary file, there are time when there isn't an
* alternative file name. A name argument of NULL turns it off.
*/
void
set_alt_name(sp, name)
SCR *sp;
char *name;
{
if (sp->alt_name != NULL)
FREE(sp->alt_name, strlen(sp->alt_name) + 1);
if (name == NULL)
sp->alt_name = NULL;
else if ((sp->alt_name = strdup(name)) == NULL)
msgq(sp, M_SYSERR, NULL);
}
/*
* baud_from_bval --
* Return the baud rate using the standard defines.
*/
u_long
baud_from_bval(sp)
SCR *sp;
{
speed_t v;
if (!F_ISSET(sp->gp, G_TERMIOS_SET))
return (9600);
switch (v = cfgetospeed(&sp->gp->original_termios)) {
case B50:
return (50);
case B75:
return (75);
case B110:
return (110);
case B134:
return (134);
case B150:
return (150);
case B200:
return (200);
case B300:
return (300);
case B600:
return (600);
case B1200:
return (1200);
case B1800:
return (1800);
case B2400:
return (2400);
case B4800:
return (4800);
#ifdef B7200
case B7200:
return (7200);
#endif
case B0: /* Hangup -- ignore. */
case B9600:
return (9600);
#ifdef B14400
case B14400:
return (14400);
#endif
case B19200:
return (19200);
#ifdef B28800
case B28800:
return (28800);
#endif
case B38400:
return (38400);
#ifdef B57600
case B57600:
return (57600);
#endif
#ifdef B115200
case B115200:
return (115200);
#endif
#ifdef B230400
case B230400:
return (230400);
#endif
default:
/*
* EXTA and EXTB aren't required by POSIX 1003.1, and
* are almost certainly the same as some of the above
* values, so they can't be part of the case statement.
*/
#ifdef EXTA
if (v == EXTA)
return (19200);
#endif
#ifdef EXTB
if (v == EXTB)
return (38400);
#endif
msgq(sp, M_ERR, "Unknown terminal baud rate %u.\n", v);
return (9600);
}
}
/*
* v_strdup --
* Strdup for wide character strings with an associated length.
*/
CHAR_T *
v_strdup(sp, str, len)
SCR *sp;
CHAR_T *str;
size_t len;
{
CHAR_T *copy;
MALLOC(sp, copy, CHAR_T *, len);
if (copy == NULL)
return (NULL);
memmove(copy, str, len * sizeof(CHAR_T));
return (copy);
}