NetBSD/bin/ed/ed.c

2207 lines
46 KiB
C

/* ed.c: This file contains the main control and user-interface routines
for the ed line editor. */
/*-
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Andrew Moore, Talke Studio.
*
* 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.
*/
/*-
* Kernighan/Plauger, "Software Tools in Pascal," (c) 1981 by
* Addison-Wesley Publishing Company, Inc. Reprinted with permission of
* the publisher.
*/
#ifndef lint
char copyright1[] =
"@(#) Copyright (c) 1993 The Regents of the University of California.\n\
All rights reserved.\n";
char copyright2[] =
"@(#) Kernighan/Plauger, Software Tools in Pascal, (c) 1981 by\n\
Addison-Wesley Publishing Company, Inc. Reprinted with permission of\n\
the publisher.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)ed.c 5.5 (Berkeley) 3/28/93";*/
static char rcsid[] = "$Id: ed.c,v 1.17 1993/08/30 02:20:22 alm Exp $";
#endif /* not lint */
/*
* CREDITS
* The buf.c algorithm is attributed to Rodney Ruddock of
* the University of Guelph, Guelph, Ontario.
*
* The cbc.c encryption code is adapted from
* the bdes program by Matt Bishop of Dartmouth College,
* Hanover, NH.
*
* Addison-Wesley Publishing Company generously granted
* permission to distribute this program over Internet.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <setjmp.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include "ed.h"
#ifdef _POSIX_SOURCE
sigjmp_buf env;
#else
jmp_buf env;
#endif
/* static buffers */
char *shcmd; /* shell command buffer */
int shcmdsz; /* shell command buffer size */
int shcmdi; /* shell command buffer index */
char *cvbuf; /* global command buffer */
int cvbufsz; /* global command buffer size */
char *lhbuf; /* lhs buffer */
int lhbufsz; /* lhs buffer size */
char *rhbuf; /* rhs buffer */
int rhbufsz; /* rhs buffer size */
int rhbufi; /* rhs buffer index */
char *rbuf; /* regsub buffer */
int rbufsz; /* regsub buffer size */
char *sbuf; /* file i/o buffer */
int sbufsz; /* file i/o buffer size */
char *ibuf; /* ed command-line buffer */
int ibufsz; /* ed command-line buffer size */
char *ibufp; /* pointer to ed command-line buffer */
/* global flags */
int isbinary; /* if set, buffer contains ASCII NULs */
int modified; /* if set, buffer modified since last write */
int garrulous = 0; /* if set, print all error messages */
int scripted = 0; /* if set, suppress diagnostics */
int des = 0; /* if set, use crypt(3) for i/o */
int mutex = 0; /* if set, signals set "sigflags" */
int sigflags = 0; /* if set, signals received while mutex set */
int sigactive = 0; /* if set, signal handlers are enabled */
int red = 0; /* if set, restrict shell/directory access */
char dfn[MAXFNAME + 1] = ""; /* default filename */
long curln; /* current address */
long lastln; /* last address */
int lineno; /* script line number */
char *prompt; /* command-line prompt */
char *dps = "*"; /* default command-line prompt */
char *usage = "usage: %s [-] [-sx] [-p string] [name]\n";
extern char errmsg[];
extern int optind;
extern char *optarg;
/* ed: line editor */
main(argc, argv)
int argc;
char **argv;
{
int c, n;
long status = 0;
red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
top:
while ((c = getopt(argc, argv, "p:sx")) != EOF)
switch(c) {
case 'p': /* set prompt */
prompt = optarg;
break;
case 's': /* run script */
scripted = 1;
break;
case 'x': /* use crypt */
#ifdef DES
des = getkey();
#else
fprintf(stderr, "crypt unavailable\n?\n");
#endif
break;
default:
fprintf(stderr, usage, argv[0]);
exit(1);
}
argv += optind;
argc -= optind;
if (argc && **argv == '-') {
scripted = 1;
if (argc > 1) {
optind = 1;
goto top;
}
argv++;
argc--;
}
/* assert: reliable signals! */
#ifdef SIGWINCH
dowinch(SIGWINCH);
if (isatty(0)) signal(SIGWINCH, dowinch);
#endif
signal(SIGHUP, onhup);
signal(SIGQUIT, SIG_IGN);
signal(SIGINT, onintr);
#ifdef _POSIX_SOURCE
if (status = sigsetjmp(env, 1))
#else
if (status = setjmp(env))
#endif
{
fputs("\n?\n", stderr);
sprintf(errmsg, "interrupt");
} else {
init_buf();
sigactive = 1; /* enable signal handlers */
if (argc && **argv && ckfn(*argv)) {
if (doread(0, *argv) < 0 && !isatty(0))
quit(2);
else if (**argv != '!')
strcpy(dfn, *argv);
} else if (argc) {
fputs("?\n", stderr);
if (**argv == '\0')
sprintf(errmsg, "invalid filename");
if (!isatty(0))
quit(2);
}
}
for (;;) {
if (status < 0 && garrulous)
fprintf(stderr, "%s\n", errmsg);
if (prompt) {
printf("%s", prompt);
fflush(stdout);
}
if ((n = getline()) < 0) {
status = ERR;
continue;
} else if (n == 0) {
if (modified && !scripted) {
fputs("?\n", stderr);
sprintf(errmsg, "warning: file modified");
if (!isatty(0)) {
fprintf(stderr, garrulous ? "script, line %d: %s\n"
: "", lineno, errmsg);
quit(2);
}
clearerr(stdin);
modified = 0;
status = EMOD;
continue;
} else
quit(0);
} else if (ibuf[n - 1] != '\n') {
/* discard line */
sprintf(errmsg, "unexpected end-of-file");
clearerr(stdin);
status = ERR;
continue;
}
if ((n = getlist()) >= 0 && (status = ckglob()) != 0) {
if (status > 0 && (status = doglob(status)) >= 0) {
curln = status;
continue;
}
} else if ((status = n) >= 0 && (status = docmd(0)) >= 0) {
if (!status || status
&& (status = doprint(curln, curln, status)) >= 0)
continue;
}
switch (status) {
case EOF:
quit(0);
case EMOD:
modified = 0;
fputs("?\n", stderr); /* give warning */
sprintf(errmsg, "warning: file modified");
if (!isatty(0)) {
fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg);
quit(2);
}
break;
case FATAL:
if (!isatty(0))
fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg);
else
fprintf(stderr, garrulous ? "%s\n" : "", errmsg);
quit(3);
default:
fputs("?\n", stderr);
if (!isatty(0)) {
fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg);
quit(2);
}
break;
}
}
/*NOTREACHED*/
}
long line1, line2, nlines;
/* getlist: get line numbers from the command buffer until an illegal
address is seen. return range status */
getlist()
{
long num;
nlines = line2 = 0;
while ((num = getone()) >= 0) {
line1 = line2;
line2 = num;
nlines++;
if (*ibufp != ',' && *ibufp != ';')
break;
else if (*ibufp++ == ';')
curln = num;
}
nlines = min(nlines, 2);
if (nlines == 0)
line2 = curln;
if (nlines <= 1)
line1 = line2;
return (num == ERR) ? ERR : nlines;
}
/* getone: return the next line number in the command buffer */
long
getone()
{
int c;
long i, num;
if ((num = getnum(1)) < 0)
return num;
for (;;) {
c = isspace(*ibufp);
skipblanks();
c = c && isdigit(*ibufp);
if (!c && *ibufp != '+' && *ibufp != '-' && *ibufp != '^')
break;
c = c ? '+' : *ibufp++;
if ((i = getnum(0)) < 0) {
sprintf(errmsg, "invalid address");
return i;
}
if (c == '+')
num += i;
else num -= i;
}
if (num > lastln || num < 0) {
sprintf(errmsg, "invalid address");
return ERR;
}
return num;
}
/* getnum: return a relative line number from the command buffer */
long
getnum(first)
int first;
{
pattern_t *pat;
char c;
skipblanks();
if (isdigit(*ibufp))
return strtol(ibufp, &ibufp, 10);
switch(c = *ibufp) {
case '.':
ibufp++;
return first ? curln : ERR;
case '$':
ibufp++;
return first ? lastln : ERR;
case '/':
case '?':
if ((pat = optpat()) == NULL)
return ERR;
else if (*ibufp == c)
ibufp++;
return first ? patscan(pat, (c == '/') ? 1 : 0) : ERR;
case '^':
case '-':
case '+':
return first ? curln : 1;
case '\'':
ibufp++;
return first ? getmark(*ibufp++) : ERR;
case '%':
case ',':
case ';':
if (first) {
ibufp++;
line2 = (c == ';') ? curln : 1;
nlines++;
return lastln;
}
return 1;
default:
return first ? EOF : 1;
}
}
/* gflags */
#define GLB 001 /* global command */
#define GPR 002 /* print after command */
#define GLS 004 /* list after command */
#define GNP 010 /* enumerate after command */
#define GSG 020 /* global substitute */
/* VRFYCMD: verify the command suffix in the command buffer */
#define VRFYCMD() { \
int done = 0; \
do { \
switch(*ibufp) { \
case 'p': \
gflag |= GPR, ibufp++; \
break; \
case 'l': \
gflag |= GLS, ibufp++; \
break; \
case 'n': \
gflag |= GNP, ibufp++; \
break; \
default: \
done++; \
} \
} while (!done); \
if (*ibufp++ != '\n') { \
sprintf(errmsg, "invalid command suffix"); \
return ERR; \
} \
}
/* ckglob: set lines matching a pattern in the command buffer; return
global status */
ckglob()
{
pattern_t *pat;
char c, delim;
char *s;
int nomatch;
long n;
line_t *lp;
int gflag = 0; /* print suffix of interactive cmd */
if ((c = *ibufp) == 'V' || c == 'G')
gflag = GLB;
else if (c != 'g' && c != 'v')
return 0;
if (ckrange(1, lastln) < 0)
return ERR;
else if ((delim = *++ibufp) == ' ' || delim == '\n') {
sprintf(errmsg, "invalid pattern delimiter");
return ERR;
} else if ((pat = optpat()) == NULL)
return ERR;
else if (*ibufp == delim)
ibufp++;
if (gflag)
VRFYCMD(); /* get print suffix */
for (lp = getlp(n = 1); n <= lastln; n++, lp = lp->next) {
if ((s = gettxt(lp)) == NULL)
return ERR;
lp->len &= ~ACTV; /* zero ACTV bit */
if (isbinary)
s = nultonl(s, lp->len & ~ACTV);
if (line1 <= n && n <= line2
&& (!(nomatch = regexec(pat, s, 0, NULL, 0))
&& (c == 'g' || c == 'G')
|| nomatch && (c == 'v' || c == 'V')))
lp->len |= ACTV;
}
return gflag | GSG;
}
/* doglob: apply command list in the command buffer to the active
lines in a range; return command status */
long
doglob(gflag)
int gflag;
{
static char *ocmd = NULL;
static int ocmdsz = 0;
line_t *lp = NULL;
long lc;
int status;
int n;
int interact = gflag & ~GSG; /* GLB & gflag ? */
char *cmd = NULL;
#ifdef BACKWARDS
if (!interact)
if (!strcmp(ibufp, "\n"))
cmd = "p\n"; /* null cmd-list == `p' */
else if ((cmd = getcmdv(&n, 0)) == NULL)
return ERR;
#else
if (!interact && (cmd = getcmdv(&n, 0)) == NULL)
return ERR;
#endif
ureset();
for (;;) {
for (lp = getlp(lc = 1); lc <= lastln; lc++, lp = lp->next)
if (lp->len & ACTV) /* active line */
break;
if (lc > lastln)
break;
lp->len ^= ACTV; /* zero ACTV bit */
curln = lc;
if (interact) {
/* print curln and get a command in global syntax */
if (doprint(curln, curln, 0) < 0)
return ERR;
while ((n = getline()) > 0
&& ibuf[n - 1] != '\n')
clearerr(stdin);
if (n < 0)
return ERR;
else if (n == 0) {
sprintf(errmsg, "unexpected end-of-file");
return ERR;
} else if (n == 1 && !strcmp(ibuf, "\n"))
continue;
else if (n == 2 && !strcmp(ibuf, "&\n")) {
if (cmd == NULL) {
sprintf(errmsg, "no previous command");
return ERR;
} else cmd = ocmd;
} else if ((cmd = getcmdv(&n, 0)) == NULL)
return ERR;
else {
CKBUF(ocmd, ocmdsz, n + 1, ERR);
memcpy(ocmd, cmd, n + 1);
cmd = ocmd;
}
}
ibufp = cmd;
for (; *ibufp;)
if ((status = getlist()) < 0
|| (status = docmd(1)) < 0
|| (status > 0
&& (status = doprint(curln, curln, status)) < 0))
return status;
}
return ((interact & ~GLB ) && doprint(curln, curln, interact) < 0) ? ERR : curln;
}
#ifdef BACKWARDS
/* GETLINE3: get a legal address from the command buffer */
#define GETLINE3(num) \
{ \
long ol1, ol2; \
\
ol1 = line1, ol2 = line2; \
if (getlist() < 0) \
return ERR; \
else if (nlines == 0) { \
sprintf(errmsg, "destination expected"); \
return ERR; \
} else if (line2 < 0 || lastln < line2) { \
sprintf(errmsg, "invalid address"); \
return ERR; \
} \
num = line2; \
line1 = ol1, line2 = ol2; \
}
#else /* BACKWARDS */
/* GETLINE3: get a legal address from the command buffer */
#define GETLINE3(num) \
{ \
long ol1, ol2; \
\
ol1 = line1, ol2 = line2; \
if (getlist() < 0) \
return ERR; \
if (line2 < 0 || lastln < line2) { \
sprintf(errmsg, "invalid address"); \
return ERR; \
} \
num = line2; \
line1 = ol1, line2 = ol2; \
}
#endif
/* sgflags */
#define SGG 001 /* complement previous global substitute suffix */
#define SGP 002 /* complement previous print suffix */
#define SGR 004 /* use last regex instead of last pat */
#define SGF 010 /* newline found */
long ucurln = -1; /* if >= 0, undo enabled */
long ulastln = -1; /* if >= 0, undo enabled */
int patlock = 0; /* if set, pattern not released by optpat() */
long rows = 22; /* scroll length: ws_row - 2 */
/* docmd: execute the next command in command buffer; return print
request, if any */
docmd(glob)
int glob;
{
static pattern_t *pat = NULL;
static int sgflag = 0;
pattern_t *tpat;
char *fnp;
int gflag = 0;
int sflags = 0;
long num = 0;
int n = 0;
int c;
skipblanks();
switch(c = *ibufp++) {
case 'a':
VRFYCMD();
if (!glob) ureset();
if (append(line2, glob) < 0)
return ERR;
break;
case 'c':
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (lndelete(line1, line2) < 0 || append(curln, glob) < 0)
return ERR;
break;
case 'd':
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (lndelete(line1, line2) < 0)
return ERR;
else if (nextln(curln, lastln) != 0)
curln = nextln(curln, lastln);
modified = 1;
break;
case 'e':
if (modified && !scripted)
return EMOD;
/* fall through */
case 'E':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
} else if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
} else if ((fnp = getfn()) == NULL)
return ERR;
VRFYCMD();
if (lndelete(1, lastln) < 0)
return ERR;
ureset();
if (sbclose() < 0)
return ERR;
else if (sbopen() < 0)
return FATAL;
if (*fnp && *fnp != '!') strcpy(dfn, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *dfn == '\0') {
sprintf(errmsg, "no current filename");
return ERR;
}
#endif
if (doread(0, *fnp ? fnp : dfn) < 0)
return ERR;
ureset();
modified = 0;
ucurln = ulastln = -1;
break;
case 'f':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
} else if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
} else if ((fnp = getfn()) == NULL)
return ERR;
else if (*fnp == '!') {
sprintf(errmsg, "invalid redirection");
return ERR;
}
VRFYCMD();
if (*fnp) strcpy(dfn, fnp);
printf("%s\n", esctos(dfn));
break;
case 'g':
case 'G':
sprintf(errmsg, "cannot nest global commands");
return ERR;
case 'h':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if (*errmsg) fprintf(stderr, "%s\n", errmsg);
break;
case 'H':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if ((garrulous = 1 - garrulous) && *errmsg)
fprintf(stderr, "%s\n", errmsg);
break;
case 'i':
if (line2 == 0) {
sprintf(errmsg, "invalid address");
return ERR;
}
VRFYCMD();
if (!glob) ureset();
if (append(prevln(line2, lastln), glob) < 0)
return ERR;
break;
case 'j':
if (ckrange(curln, curln + 1) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (line1 != line2 && join(line1, line2) < 0)
return ERR;
break;
case 'k':
c = *ibufp++;
if (line2 == 0) {
sprintf(errmsg, "invalid address");
return ERR;
}
VRFYCMD();
if (putmark(c, getlp(line2)) < 0)
return ERR;
break;
case 'l':
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (doprint(line1, line2, gflag | GLS) < 0)
return ERR;
gflag = 0;
break;
case 'm':
if (ckrange(curln, curln) < 0)
return ERR;
GETLINE3(num);
if (line1 <= num && num < line2) {
sprintf(errmsg, "invalid destination");
return ERR;
}
VRFYCMD();
if (!glob) ureset();
if (move(num, glob) < 0)
return ERR;
else
modified = 1;
break;
case 'n':
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (doprint(line1, line2, gflag | GNP) < 0)
return ERR;
gflag = 0;
break;
case 'p':
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (doprint(line1, line2, gflag | GPR) < 0)
return ERR;
gflag = 0;
break;
case 'P':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
prompt = prompt ? NULL : optarg ? optarg : dps;
break;
case 'q':
case 'Q':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
break;
case 'r':
if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
} else if (nlines == 0)
line2 = lastln;
if ((fnp = getfn()) == NULL)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (*dfn == '\0' && *fnp != '!') strcpy(dfn, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *dfn == '\0') {
sprintf(errmsg, "no current filename");
return ERR;
}
#endif
if ((num = doread(line2, *fnp ? fnp : dfn)) < 0)
return ERR;
else if (num && num != lastln)
modified = 1;
break;
case 's':
do {
switch(*ibufp) {
case '\n':
sflags |=SGF;
break;
case 'g':
sflags |= SGG;
ibufp++;
break;
case 'p':
sflags |= SGP;
ibufp++;
break;
case 'r':
sflags |= SGR;
ibufp++;
break;
default:
if (sflags) {
sprintf(errmsg, "invalid command suffix");
return ERR;
}
}
} while (sflags && *ibufp != '\n');
if (sflags && !pat) {
sprintf(errmsg, "no previous substitution");
return ERR;
} else if (!(sflags & SGF))
sgflag &= 0xff;
if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
sprintf(errmsg, "invalid pattern delimiter");
return ERR;
}
tpat = pat;
spl1();
if ((!sflags || (sflags & SGR))
&& (tpat = optpat()) == NULL)
return ERR;
else if (tpat != pat) {
if (pat) {
regfree(pat);
free(pat);
}
pat = tpat;
patlock = 1; /* reserve pattern */
} else if (pat == NULL) {
/* NOTREACHED */
sprintf(errmsg, "no previous substitution");
return ERR;
}
spl0();
if (!sflags && (sgflag = getrhs(glob)) < 0)
return ERR;
else if (glob)
sgflag |= GLB;
else
sgflag &= ~GLB;
if (sflags & SGG)
sgflag ^= GSG;
if (sflags & SGP)
sgflag ^= GPR, sgflag &= ~(GLS | GNP);
do {
switch(*ibufp) {
case 'p':
sgflag |= GPR, ibufp++;
break;
case 'l':
sgflag |= GLS, ibufp++;
break;
case 'n':
sgflag |= GNP, ibufp++;
break;
default:
n++;
}
} while (!n);
if (ckrange(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if ((n = subst(pat, sgflag)) < 0)
return ERR;
else if (n)
modified = 1;
break;
case 't':
if (ckrange(curln, curln) < 0)
return ERR;
GETLINE3(num);
VRFYCMD();
if (!glob) ureset();
if (transfer(num) < 0)
return ERR;
modified = 1;
break;
case 'u':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if (undo(glob) < 0)
return ERR;
break;
case 'v':
case 'V':
sprintf(errmsg, "cannot nest global commands");
return ERR;
case 'w':
case 'W':
if ((n = *ibufp) == 'q' || n == 'Q') {
gflag = EOF;
ibufp++;
}
if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
} else if ((fnp = getfn()) == NULL)
return ERR;
if (nlines == 0 && !lastln)
line1 = line2 = 0;
else if (ckrange(1, lastln) < 0)
return ERR;
VRFYCMD();
if (*dfn == '\0' && *fnp != '!') strcpy(dfn, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *dfn == '\0') {
sprintf(errmsg, "no current filename");
return ERR;
}
#endif
if ((num = dowrite(line1, line2, *fnp ? fnp : dfn, (c == 'W') ? "a" : "w")) < 0)
return ERR;
else if (num == lastln)
modified = 0;
else if (modified && !scripted && n == 'q')
gflag = EMOD;
break;
case 'x':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
#ifdef DES
des = getkey();
#else
sprintf(errmsg, "crypt unavailable");
return ERR;
#endif
break;
case 'z':
#ifdef BACKWARDS
if (ckrange(line1 = 1, curln + 1) < 0)
#else
if (ckrange(line1 = 1, curln + !glob) < 0)
#endif
return ERR;
else if ('0' < *ibufp && *ibufp <= '9')
rows = strtol(ibufp, &ibufp, 10);
VRFYCMD();
if (doprint(line2, min(lastln, line2 + rows - 1), gflag) < 0)
return ERR;
gflag = 0;
break;
case '=':
VRFYCMD();
printf("%d\n", nlines ? line2 : lastln);
break;
case '!':
#ifndef VI_BANG
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
#endif
if ((sflags = getshcmd()) < 0)
return ERR;
VRFYCMD();
if (sflags) printf("%s\n", shcmd + 1);
#ifdef VI_BANG
if (nlines == 0) {
#endif
system(shcmd + 1);
if (!scripted) printf("!\n");
break;
#ifdef VI_BANG
}
if (!lastln && !line1 && !line2) {
if (!glob) ureset();
} else if (ckrange(curln, curln) < 0)
return ERR;
else {
if (!glob) ureset();
if (lndelete(line1, line2) < 0)
return ERR;
line2 = curln;
modified = 1;
}
if ((num = doread(line2, shcmd)) < 0)
return ERR;
else if (num && num != lastln)
modified = 1;
break;
#endif
case '\n':
#ifdef BACKWARDS
if (ckrange(line1 = 1, curln + 1) < 0
#else
if (ckrange(line1 = 1, curln + !glob) < 0
#endif
|| doprint(line2, line2, 0) < 0)
return ERR;
break;
default:
sprintf(errmsg, "unknown command");
return ERR;
}
return gflag;
}
/* ckrange: return status of line number range check */
ckrange(def1, def2)
long def1, def2;
{
if (nlines == 0) {
line1 = def1;
line2 = def2;
}
if (line1 > line2 || 1 > line1 || line2 > lastln) {
sprintf(errmsg, "invalid address");
return ERR;
}
return 0;
}
/* patscan: return the number of the next line matching a pattern in a
given direction. wrap around begin/end of line queue if necessary */
long
patscan(pat, dir)
pattern_t *pat;
int dir;
{
char *s;
long n = curln;
line_t *lp;
do {
if (n = dir ? nextln(n, lastln) : prevln(n, lastln)) {
if ((s = gettxt(lp = getlp(n))) == NULL)
return ERR;
if (isbinary)
s = nultonl(s, lp->len & ~ACTV);
if (!regexec(pat, s, 0, NULL, 0))
return n;
}
} while (n != curln);
sprintf(errmsg, "no match");
return ERR;
}
/* getfn: return pointer to copy of filename in the command buffer */
char *
getfn()
{
static char *file = NULL;
static int filesz = 0;
int n;
if (*ibufp != '\n') {
skipblanks();
if (*ibufp == '\n') {
sprintf(errmsg, "invalid filename");
return NULL;
} else if ((ibufp = getcmdv(&n, 1)) == NULL)
return NULL;
#ifdef VI_BANG
else if (*ibufp == '!') {
ibufp++;
if ((n = getshcmd()) < 0)
return NULL;
if (n) printf("%s\n", shcmd + 1);
return shcmd;
}
#endif
else if (n - 1 > MAXFNAME) {
sprintf(errmsg, "filename too long");
return NULL;
}
}
#ifndef BACKWARDS
else if (*dfn == '\0') {
sprintf(errmsg, "no current filename");
return NULL;
}
#endif
CKBUF(file, filesz, MAXFNAME + 1, NULL);
for (n = 0; *ibufp != '\n';)
file[n++] = *ibufp++;
file[n] = '\0';
return ckfn(file);
}
/* getrhs: extract substitution template from the command buffer */
getrhs(glob)
int glob;
{
char delim;
if ((delim = *ibufp) == '\n') {
rhbufi = 0;
return GPR;
} else if (makesub(glob) == NULL)
return ERR;
else if (*ibufp == '\n')
return GPR;
else if (*ibufp == delim)
ibufp++;
if ('1' <= *ibufp && *ibufp <= '9')
return (int) strtol(ibufp, &ibufp, 10) << 8;
else if (*ibufp == 'g') {
ibufp++;
return GSG;
}
return 0;
}
/* makesub: return pointer to copy of substitution template in the command
buffer */
char *
makesub(glob)
int glob;
{
int n = 0;
int i = 0;
char delim = *ibufp++;
char c;
if (*ibufp == '%' && *(ibufp + 1) == delim) {
ibufp++;
if (!rhbuf) sprintf(errmsg, "no previous substitution");
return rhbuf;
}
while (*ibufp != delim) {
CKBUF(rhbuf, rhbufsz, i + 2, NULL);
if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
i--, ibufp--;
break;
} else if (c != '\\')
;
else if ((rhbuf[i++] = *ibufp++) != '\n')
;
else if (!glob) {
while ((n = getline()) == 0
|| n > 0 && ibuf[n - 1] != '\n')
clearerr(stdin);
if (n < 0)
return NULL;
} else
/*NOTREACHED*/
;
}
CKBUF(rhbuf, rhbufsz, i + 1, NULL);
rhbuf[rhbufi = i] = '\0';
return rhbuf;
}
/* getshcmd: read a shell command up a maximum size from stdin; return
substitution status */
int
getshcmd()
{
static char *buf = NULL;
static int n = 0;
char *s; /* substitution char pointer */
int i = 0;
int j = 0;
if (red) {
sprintf(errmsg, "shell access restricted");
return ERR;
} else if ((s = ibufp = getcmdv(&j, 1)) == NULL)
return ERR;
CKBUF(buf, n, j + 1, ERR);
buf[i++] = '!'; /* prefix command w/ bang */
while (*ibufp != '\n')
switch (*ibufp) {
default:
CKBUF(buf, n, i + 2, ERR);
buf[i++] = *ibufp;
if (*ibufp++ == '\\')
buf[i++] = *ibufp++;
break;
case '!':
if (s != ibufp) {
CKBUF(buf, n, i + 1, ERR);
buf[i++] = *ibufp++;
}
#ifdef BACKWARDS
else if (shcmd == NULL || *(shcmd + 1) == '\0')
#else
else if (shcmd == NULL)
#endif
{
sprintf(errmsg, "no previous command");
return ERR;
} else {
CKBUF(buf, n, i + shcmdi, ERR);
for (s = shcmd + 1; s < shcmd + shcmdi;)
buf[i++] = *s++;
s = ibufp++;
}
break;
case '%':
if (*dfn == '\0') {
sprintf(errmsg, "no current filename");
return ERR;
}
j = strlen(s = esctos(dfn));
CKBUF(buf, n, i + j, ERR);
while (j--)
buf[i++] = *s++;
s = ibufp++;
break;
}
CKBUF(shcmd, shcmdsz, i + 1, ERR);
memcpy(shcmd, buf, i);
shcmd[shcmdi = i] = '\0';
return *s == '!' || *s == '%';
}
/* append: insert text from stdin to after line n; stop when either a
single period is read or EOF; return status */
append(n, glob)
long n;
int glob;
{
int l;
char *lp = ibuf;
char *eot;
undo_t *up = NULL;
for (curln = n;;) {
if (!glob) {
if ((l = getline()) < 0)
return ERR;
else if (l == 0 || ibuf[l - 1] != '\n') {
clearerr(stdin);
return l ? EOF : 0;
}
lp = ibuf;
} else if (*(lp = ibufp) == '\0')
return 0;
else {
while (*ibufp++ != '\n')
;
l = ibufp - lp;
}
if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
return 0;
}
eot = lp + l;
spl1();
do {
if ((lp = puttxt(lp)) == NULL) {
spl0();
return ERR;
} else if (up)
up->t = getlp(curln);
else if ((up = upush(UADD, curln, curln)) == NULL) {
spl0();
return ERR;
}
} while (lp != eot);
spl0();
modified = 1;
}
}
/* subst: change all text matching a pattern in a range of lines according to
a substitution template; return status */
subst(pat, gflag)
pattern_t *pat;
int gflag;
{
undo_t *up;
char *txt;
char *eot;
long lc;
int nsubs = 0;
line_t *lp;
int len;
curln = prevln(line1, lastln);
for (lc = 0; lc <= line2 - line1; lc++) {
lp = getlp(curln = nextln(curln, lastln));
if ((len = regsub(pat, lp, gflag)) < 0)
return ERR;
else if (len) {
up = NULL;
if (lndelete(curln, curln) < 0)
return ERR;
txt = rbuf;
eot = rbuf + len;
spl1();
do {
if ((txt = puttxt(txt)) == NULL) {
spl0();
return ERR;
} else if (up)
up->t = getlp(curln);
else if ((up = upush(UADD, curln, curln)) == NULL) {
spl0();
return ERR;
}
} while (txt != eot);
spl0();
nsubs++;
}
}
if (nsubs == 0 && !(gflag & GLB)) {
sprintf(errmsg, "no match");
return ERR;
} else if ((gflag & (GPR | GLS | GNP))
&& doprint(curln, curln, gflag) < 0)
return ERR;
return 1;
}
/* regsub: replace text matched by a pattern according to a substitution
template; return pointer to the modified text */
regsub(pat, lp, gflag)
pattern_t *pat;
line_t *lp;
int gflag;
{
int off = 0;
int kth = gflag >> 8; /* substitute kth match only */
int chngd = 0;
int matchno = 0;
int len;
int i = 0;
regmatch_t rm[SE_MAX];
char *txt;
char *eot;
if ((txt = gettxt(lp)) == NULL)
return ERR;
len = lp->len & ~ACTV;
eot = txt + len;
if (isbinary) txt = nultonl(txt, len);
if (!regexec(pat, txt, SE_MAX, rm, 0)) {
do {
if (!kth || kth == ++matchno) {
chngd++;
i = rm[0].rm_so;
CKBUF(rbuf, rbufsz, off + i, ERR);
if (isbinary) txt = nltonul(txt, rm[0].rm_eo);
memcpy(rbuf + off, txt, i);
if ((off = catsub(txt, rm, off += i)) < 0)
return ERR;
} else {
i = rm[0].rm_eo;
CKBUF(rbuf, rbufsz, off + i, ERR);
if (isbinary) txt = nltonul(txt, i);
memcpy(rbuf + off, txt, i);
off += i;
}
txt += rm[0].rm_eo;
} while (*txt && (!chngd || (gflag & GSG) && rm[0].rm_eo)
&& !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
i = eot - txt;
CKBUF(rbuf, rbufsz, off + i + 2, ERR);
if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) {
sprintf(errmsg, "infinite substitution loop");
return ERR;
}
if (isbinary) txt = nltonul(txt, i);
memcpy(rbuf + off, txt, i);
memcpy(rbuf + off + i, "\n", 2);
}
return chngd ? off + i + 1 : 0;
}
/* join: replace a range of lines with the joined text of those lines */
join(from, to)
long from;
long to;
{
static char *buf = NULL;
static int n;
char *s;
int len = 0;
int size = 0;
line_t *bp, *ep;
ep = getlp(nextln(to, lastln));
for (bp = getlp(from); bp != ep; bp = bp->next, size += len) {
if ((s = gettxt(bp)) == NULL)
return ERR;
len = bp->len & ~ACTV;
CKBUF(buf, n, size + len, ERR);
memcpy(buf + size, s, len);
}
CKBUF(buf, n, size + 2, ERR);
memcpy(buf + size, "\n", 2);
if (lndelete(from, to) < 0)
return ERR;
curln = from - 1;
spl1();
if (puttxt(buf) == NULL
|| upush(UADD, curln, curln) == NULL) {
spl0();
return ERR;
}
spl0();
modified = 1;
return 0;
}
/* move: move a range of lines */
move(num, glob)
long num;
int glob;
{
line_t *b1, *a1, *b2, *a2, *lp;
long n = nextln(line2, lastln);
long p = prevln(line1, lastln);
int done = (num == line1 - 1 || num == line2);
spl1();
if (done) {
a2 = getlp(n);
b2 = getlp(p);
curln = line2;
} else if (upush(UMOV, p, n) == NULL
|| upush(UMOV, num, nextln(num, lastln)) == NULL) {
spl0();
return ERR;
} else {
a1 = getlp(n);
if (num < line1)
b1 = getlp(p), b2 = getlp(num); /* this getlp last! */
else b2 = getlp(num), b1 = getlp(p); /* this getlp last! */
a2 = b2->next;
requeue(b2, b1->next);
requeue(a1->prev, a2);
requeue(b1, a1);
curln = num + ((num < line1) ? line2 - line1 + 1 : 0);
}
if (glob)
for (lp = b2->next; lp != a2; lp = lp->next)
lp->len &= ~ACTV; /* zero ACTV bit */
spl0();
return 0;
}
/* transfer: copy a range of lines; return status */
transfer(num)
long num;
{
line_t *lp;
long nl, nt, lc;
long mid = (num < line2) ? num : line2;
undo_t *up = NULL;
curln = num;
for (nt = 0, nl = line1; nl <= mid; nl++, nt++) {
spl1();
if ((lp = lpdup(getlp(nl))) == NULL) {
spl0();
return ERR;
}
lpqueue(lp);
if (up)
up->t = lp;
else if ((up = upush(UADD, curln, curln)) == NULL) {
spl0();
return ERR;
}
spl0();
}
for (nl += nt, lc = line2 + nt; nl <= lc; nl += 2, lc++) {
spl1();
if ((lp = lpdup(getlp(nl))) == NULL) {
spl0();
return ERR;
}
lpqueue(lp);
if (up)
up->t = lp;
else if ((up = upush(UADD, curln, curln)) == NULL) {
spl0();
return ERR;
}
spl0();
}
return 0;
}
/* lndelete: delete a range of lines */
lndelete(from, to)
long from, to;
{
line_t *before, *after;
spl1();
if (upush(UDEL, from, to) == NULL) {
spl0();
return ERR;
}
after = getlp(nextln(to, lastln));
before = getlp(prevln(from, lastln)); /* this getlp last! */
requeue(before, after);
lastln -= to - from + 1;
curln = prevln(from, lastln);
spl0();
return 0;
}
/* catsub: modify text according to a substitution template;
return offset to end of modified text */
catsub(boln, rm, off)
char *boln;
regmatch_t *rm;
int off;
{
int j = 0;
int k = 0;
char *sub = rhbuf;
for (; sub - rhbuf < rhbufi; sub++)
if (*sub == '&') {
j = rm[0].rm_so;
k = rm[0].rm_eo;
CKBUF(rbuf, rbufsz, off + k - j, ERR);
while (j < k)
rbuf[off++] = boln[j++];
} else if (*sub == '\\' && '1' <= *++sub && *sub <= '9'
&& rm[*sub - '0'].rm_so >= 0
&& rm[*sub - '0'].rm_eo >= 0) {
j = rm[*sub - '0'].rm_so;
k = rm[*sub - '0'].rm_eo;
CKBUF(rbuf, rbufsz, off + k - j, ERR);
while (j < k)
rbuf[off++] = boln[j++];
} else {
CKBUF(rbuf, rbufsz, off + 1, ERR);
rbuf[off++] = *sub;
}
CKBUF(rbuf, rbufsz, off + 1, ERR);
rbuf[off] = '\0';
return off;
}
/* doprint: print a range of lines to stdout */
doprint(from, to, gflag)
long from;
long to;
int gflag;
{
line_t *bp;
line_t *ep;
char *s;
if (!from) {
sprintf(errmsg, "invalid address");
return ERR;
}
ep = getlp(nextln(to, lastln));
for (bp = getlp(from); bp != ep; bp = bp->next) {
if ((s = gettxt(bp)) == NULL)
return ERR;
putstr(s, bp->len & ~ACTV, curln = from++, gflag);
}
return 0;
}
int cols = 72; /* wrap column: ws_col - 8 */
/* putstr: print text to stdout */
void
putstr(s, l, n, gflag)
char *s;
int l;
long n;
int gflag;
{
int col = 0;
if (gflag & GNP) {
printf("%ld\t", n);
col = 8;
}
for (; l--; s++) {
if ((gflag & GLS) && ++col > cols) {
fputs("\\\n", stdout);
col = 1;
}
if (gflag & GLS) {
switch (*s) {
case '\b':
fputs("\\b", stdout);
break;
case '\f':
fputs("\\f", stdout);
break;
case '\n':
fputs("\\n", stdout);
break;
case '\r':
fputs("\\r", stdout);
break;
case '\t':
fputs("\\t", stdout);
break;
case '\v':
fputs("\\v", stdout);
break;
default:
if (*s < 32 || 126 < *s) {
putchar('\\');
putchar((((unsigned char) *s & 0300) >> 6) + '0');
putchar((((unsigned char) *s & 070) >> 3) + '0');
putchar(((unsigned char) *s & 07) + '0');
col += 2;
} else if (*s == '\\')
fputs("\\\\", stdout);
else {
putchar(*s);
col--;
}
}
col++;
} else
putchar(*s);
}
#ifndef BACKWARDS
if (gflag & GLS)
putchar('$');
#endif
putchar('\n');
}
int newline_added; /* set if newline appended to input file */
/* doread: read a text file into the editor buffer; return line count */
long
doread(n, fn)
long n;
char *fn;
{
FILE *fp;
line_t *lp = getlp(n);
unsigned long size = 0;
undo_t *up = NULL;
int len;
isbinary = newline_added = 0;
if ((fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(esctos(fn), "r")) == NULL) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot open input file");
return ERR;
} else if (des)
desinit();
for (curln = n; (len = sgetline(fp)) > 0; size += len) {
spl1();
if (puttxt(sbuf) == NULL) {
spl0();
return ERR;
}
lp = lp->next;
if (up)
up->t = lp;
else if ((up = upush(UADD, curln, curln)) == NULL) {
spl0();
return ERR;
}
spl0();
}
if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot close input file");
return ERR;
}
if (newline_added && !isbinary)
fputs("newline appended\n", stderr);
if (des) size += 8 - size % 8;
fprintf(stderr, !scripted ? "%lu\n" : "", size);
return (len < 0) ? ERR : curln - n;
}
/* dowrite: write the text of a range of lines to a file; return line count */
long
dowrite(n, m, fn, mode)
long n;
long m;
char *fn;
char *mode;
{
FILE *fp;
line_t *lp;
unsigned long size = 0;
long lc = n ? m - n + 1 : 0;
char *s = NULL;
int len;
int ct;
if ((fp = ((*fn == '!') ? popen(fn + 1, "w") : fopen(esctos(fn), mode))) == NULL) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot open output file");
return ERR;
} else if (des)
desinit();
if (n && !des)
for (lp = getlp(n); n <= m; n++, lp = lp->next) {
if ((s = gettxt(lp)) == NULL)
return ERR;
len = lp->len & ~ACTV;
if (n != lastln || !isbinary || !newline_added)
s[len++] = '\n';
if ((ct = fwrite(s, sizeof(char), len, fp)) < 0 || ct != len) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot write file");
return ERR;
}
size += len;
}
else if (n)
for (lp = getlp(n); n <= m; n++, lp = lp->next) {
if ((s = gettxt(lp)) == NULL)
return ERR;
len = lp->len & ~ACTV;
while (len--) {
if (desputc(*s++, fp) == EOF && ferror(fp)) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot write file");
return ERR;
}
}
if (n != lastln || !isbinary || !newline_added) {
if (desputc('\n', fp) < 0) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot write file");
return ERR;
}
size++; /* for '\n' */
}
size += (lp->len & ~ACTV);
}
if (des) {
desflush(fp); /* flush buffer */
size += 8 - size % 8; /* adjust DES size */
}
if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
fprintf(stderr, "%s: %s\n", fn, strerror(errno));
sprintf(errmsg, "cannot close output file");
return ERR;
}
fprintf(stderr, !scripted ? "%lu\n" : "", size);
return lc;
}
#define USIZE 100 /* undo stack size */
undo_t *ustack = NULL; /* undo stack */
long usize = 0; /* stack size variable */
long u_p = 0; /* undo stack pointer */
/* upush: return pointer to intialized undo node */
undo_t *
upush(type, from, to)
int type;
long from;
long to;
{
undo_t *t;
#if defined(sun) || defined(NO_REALLOC_NULL)
if (ustack == NULL
&& (ustack = (undo_t *) malloc((usize = USIZE) * sizeof(undo_t))) == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
sprintf(errmsg, "out of memory");
return NULL;
}
#endif
t = ustack;
if (u_p < usize
|| (t = (undo_t *) realloc(ustack, (usize += USIZE) * sizeof(undo_t))) != NULL) {
ustack = t;
ustack[u_p].type = type;
ustack[u_p].t = getlp(to);
ustack[u_p].h = getlp(from);
return ustack + u_p++;
}
/* out of memory - release undo stack */
fprintf(stderr, "%s\n", strerror(errno));
sprintf(errmsg, "out of memory");
ureset();
free(ustack);
ustack = NULL;
usize = 0;
return NULL;
}
/* USWAP: swap undo nodes */
#define USWAP(x,y) { \
undo_t utmp; \
utmp = x, x = y, y = utmp; \
}
/* undo: undo last change to the editor buffer */
undo(glob)
int glob;
{
long n;
long ocurln = curln;
long olastln = lastln;
line_t *lp, *np;
if (ucurln == -1 || ulastln == -1) {
sprintf(errmsg, "nothing to undo");
return ERR;
} else if (u_p)
modified = 1;
getlp(0); /* this getlp last! */
spl1();
for (n = u_p; n-- > 0;) {
switch(ustack[n].type) {
case UADD:
requeue(ustack[n].h->prev, ustack[n].t->next);
break;
case UDEL:
requeue(ustack[n].h->prev, ustack[n].h);
requeue(ustack[n].t, ustack[n].t->next);
break;
case UMOV:
case VMOV:
requeue(ustack[n - 1].h, ustack[n].h->next);
requeue(ustack[n].t->prev, ustack[n - 1].t);
requeue(ustack[n].h, ustack[n].t);
n--;
break;
default:
/*NOTREACHED*/
;
}
ustack[n].type ^= 1;
}
/* reverse undo order */
for (n = u_p; n-- > (u_p + 1)/ 2;)
USWAP(ustack[n], ustack[u_p - 1 - n]);
if (glob)
for (lp = np = getlp(0); (lp = lp->next) != np;)
lp->len &= ~ACTV; /* zero ACTV bit */
curln = ucurln, ucurln = ocurln;
lastln = ulastln, ulastln = olastln;
spl0();
return 0;
}
/* ureset: clear the undo stack */
void
ureset()
{
line_t *lp, *ep, *tl;
while (u_p--)
if (ustack[u_p].type == UDEL) {
ep = ustack[u_p].t->next;
for (lp = ustack[u_p].h; lp != ep; lp = tl) {
clrmark(lp);
tl = lp->next;
free(lp);
}
}
u_p = 0;
ucurln = curln;
ulastln = lastln;
}
#define MAXMARK 26 /* max number of marks */
line_t *mark[MAXMARK]; /* line markers */
int markno; /* line marker count */
/* getmark: return address of a marked line */
long
getmark(n)
int n;
{
if (!islower(n)) {
sprintf(errmsg, "invalid mark character");
return ERR;
}
return getaddr(mark[n - 'a']);
}
/* putmark: set a line node mark */
int
putmark(n, lp)
int n;
line_t *lp;
{
if (!islower(n)) {
sprintf(errmsg, "invalid mark character");
return ERR;
} else if (mark[n - 'a'] == NULL)
markno++;
mark[n - 'a'] = lp;
return 0;
}
/* clrmark: clear line node marks */
void
clrmark(lp)
line_t *lp;
{
int i;
if (markno)
for (i = 0; i < MAXMARK; i++)
if (mark[i] == lp) {
mark[i] = NULL;
markno--;
}
}
/* sgetline: read a line of text up a maximum size from a file; return
line length */
sgetline(fp)
FILE *fp;
{
register int c;
register int i = 0;
while (((c = des ? desgetc(fp) : getc(fp)) != EOF || !feof(fp) && !ferror(fp)) && c != '\n') {
CKBUF(sbuf, sbufsz, i + 1, ERR);
if (!(sbuf[i++] = c)) isbinary = 1;
}
CKBUF(sbuf, sbufsz, i + 2, ERR);
if (c == '\n')
sbuf[i++] = c;
else if (feof(fp) && i) {
sbuf[i++] = '\n';
newline_added = 1;
} else if (ferror(fp)) {
fprintf(stderr, "%s\n", strerror(errno));
sprintf(errmsg, "cannot read input file");
return ERR;
}
sbuf[i] = '\0';
return (isbinary && newline_added && i) ? --i : i;
}
/* getline: read a line of text up a maximum size from stdin; return
line length */
getline()
{
register int i = 0;
register int oi = 0;
char c;
/* Read one character at a time to avoid i/o contention with shell
escapes invoked by nonterminal input, e.g.,
ed - <<EOF
!cat
hello, world
EOF */
for (;;)
switch (read(0, &c, 1)) {
default:
oi = 0;
CKBUF(ibuf, ibufsz, i + 2, ERR);
if (!(ibuf[i++] = c)) isbinary = 1;
if (c != '\n')
continue;
lineno++; /* script line no. */
ibuf[i] = '\0';
ibufp = ibuf;
return i;
case 0:
if (i != oi) {
oi = i;
continue;
} else if (i)
ibuf[i] = '\0';
ibufp = ibuf;
return i;
case -1:
fprintf(stderr, "%s\n", strerror(errno));
sprintf(errmsg, "cannot read standard input");
clearerr(stdin);
ibufp = NULL;
return ERR;
}
}
/* getcmdv: get a command vector */
char *
getcmdv(sizep, nonl)
int *sizep;
int nonl;
{
int l, n;
char *t = ibufp;
while (*t++ != '\n')
;
if ((l = t - ibufp) < 2 || !oddesc(ibufp, ibufp + l - 1)) {
*sizep = l;
return ibufp;
}
*sizep = -1;
CKBUF(cvbuf, cvbufsz, l, NULL);
memcpy(cvbuf, ibufp, l);
*(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
if (nonl) l--; /* strip newline */
for (;;) {
if ((n = getline()) < 0)
return NULL;
else if (n == 0 || ibuf[n - 1] != '\n') {
sprintf(errmsg, "unexpected end-of-file");
return NULL;
}
CKBUF(cvbuf, cvbufsz, l + n, NULL);
memcpy(cvbuf + l, ibuf, n);
l += n;
if (n < 2 || !oddesc(cvbuf, cvbuf + l - 1))
break;
*(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
if (nonl) l--; /* strip newline */
}
CKBUF(cvbuf, cvbufsz, l + 1, NULL);
cvbuf[l] = '\0';
*sizep = l;
return cvbuf;
}
/* lpdup: return a pointer to a copy of a line node */
line_t *
lpdup(lp)
line_t *lp;
{
line_t *np;
if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
sprintf(errmsg, "out of memory");
return NULL;
}
np->seek = lp->seek;
np->len = (lp->len & ~ACTV); /* zero ACTV bit */
return np;
}
/* oddesc: return the parity of escapes preceding a character in a
string */
oddesc(s, t)
char *s;
char *t;
{
return (s == t || *(t - 1) != '\\') ? 0 : !oddesc(s, t - 1);
}
/* esctos: return copy of escaped string */
char *
esctos(s)
char *s;
{
static char *file = NULL;
static int filesz = 0;
int i = 0;
CKBUF(file, filesz, MAXFNAME + 1, NULL);
/* assert: no trailing escape */
while (file[i++] = (*s == '\\') ? *++s : *s)
s++;
return file;
}
void
onhup(signo)
int signo;
{
if (mutex)
sigflags |= (1 << signo);
else dohup(signo);
}
void
onintr(signo)
int signo;
{
if (mutex)
sigflags |= (1 << signo);
else dointr(signo);
}
void
dohup(signo)
int signo;
{
char *hup = NULL; /* hup filename */
char *s;
int n;
if (!sigactive)
quit(1);
sigflags &= ~(1 << signo);
if (lastln && dowrite(1, lastln, "ed.hup", "w") < 0
&& (s = getenv("HOME")) != NULL
&& (n = strlen(s)) + 8 <= MAXFNAME /* "ed.hup" + '/' */
&& (hup = (char *) malloc(n + 10)) != NULL) {
strcpy(hup, s);
if (hup[n - 1] != '/')
hup[n] = '/', hup[n+1] = '\0';
strcat(hup, "ed.hup");
dowrite(1, lastln, hup, "w");
}
quit(2);
}
void
dointr(signo)
int signo;
{
if (!sigactive)
quit(1);
sigflags &= ~(1 << signo);
#ifdef _POSIX_SOURCE
siglongjmp(env, -1);
#else
longjmp(env, -1);
#endif
}
struct winsize ws; /* window size structure */
void
dowinch(signo)
int signo;
{
sigflags &= ~(1 << signo);
if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
if (ws.ws_row > 2) rows = ws.ws_row - 2;
if (ws.ws_col > 8) cols = ws.ws_col - 8;
}
}
/* ckfn: return a legal filename */
char *
ckfn(s)
char *s;
{
if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
sprintf(errmsg, "shell access restricted");
return NULL;
}
return s;
}