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NetBSD/bin/ed/ed.c
cgd cd30aed2e6 ed core dumped on blank lines.
1993-04-10 12:47:09 +00:00

1991 lines
41 KiB
C
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/* ed.c: This file contains the main control and user-interface routines
for the ed line editor. */
/*-
* This code is derived from software by Brian W. Kernighan, Bell
* Laboratories, Murray Hill, New Jersey and P. J. Plauger, Whitesmiths, Ltd.
*
* Kernighan/Plauger, "Software Tools in Pascal," (c) 1981 by
* Addison-Wesley Publishing Company, Inc. Reprinted with permission of
* the publisher.
*/
/*-
* 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.
*/
#ifndef lint
char copyright1[] =
"@(#) Kernighan/Plauger, \"Software Tools in Pascal,\" (c) 1981 by\n\
Addison-Wesley Publishing Company, Inc. Reprinted with permission of\n\
the publisher.\n";
char copyright2[] =
"@(#) Copyright (c) 1993 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)ed.c 5.5 (Berkeley) 3/28/93";
#endif /* not lint */
/*
* ED -- ED line editor
* options:
* -p key use key as the command prompt
* -s run a script
* - same as -s (though deprecated)
* -x use crypt on file i/o
*
* Author: Andrew Moore
* Talke Studio
* 485 Redwood Avenue, #5
* Redwood City, CA 94061
* Email: alm@netcom.com
*
* 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.
*
* The Addison-Wesley Publishing Company generously
* granted permission to distribute this program over
* Internet.
*
* Brian Beattie, Kees Bot and "others" did a C port of
* Kernighan and Pike's "Software Tools" editor.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <setjmp.h>
#include <signal.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include "ed.h"
jmp_buf env;
line_t line0; /* initial node of line queue */
int modified; /* file-changed status */
char ibuf[MAXLINE]; /* input buffer */
char *ibufp; /* input pointer */
long curln; /* current line number */
long lastln; /* last line number */
char fnp[MAXFNAME] = ""; /* output file name */
char *prompt; /* command-line prompt */
char *defprompt = "*"; /* default prompt */
int lineno; /* script line number */
struct winsize ws; /* window size structure */
int rows = 22; /* scroll length: ws_row - 2 */
int cols = 72; /* wrap column: ws_col - 8 */
/* global flags */
int garrulous = 0; /* if set, print all error messages */
int verbose = 1; /* if set, print diagnostics */
int des = 0; /* if set, use crypt for i/o */
int rtq = 0; /* if set, ready to quit */
int interactive = 0; /* if set, interactive command mode */
int mutex = 0; /* if set, signals set "sigflags" */
int sigflags = 0; /* if set, signals received while mutex set */
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;
while ((c = getopt(argc, argv, "p:sx")) != EOF)
switch(c) {
case 'p': /* set prompt */
prompt = optarg;
break;
case 's': /* run script */
verbose = 0;
break;
case 'x': /* use crypt */
#ifdef DES
des = getkey();
#else
fprintf(stderr, "crypt unavailable\n?\n");
#endif
break;
default:
fprintf(stderr, "usage: ed [-p prompt] [-sx] [-] [file]\n");
exit(1);
}
argv += optind;
argc -= optind;
if (argc && **argv == '-') {
verbose = 0;
argc--;
argv++;
}
requeue(&line0, &line0);
if (sbopen() < 0 || argc && doread(0, strcpy(fnp, *argv)) < 0) {
fprintf(stderr, "%s\n?\n", errmsg);
if (!isatty(0)) quit(2);
}
dowinch(SIGWINCH);
/* assert: reliable signals! */
if (isatty(0))
signal(SIGWINCH, dowinch);
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, onhup);
if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
if (!(status = setjmp(env)))
signal(SIGINT, onintr);
}
freecmdv();
interactive = 0;
for (;;) {
rtq = (!verbose || status == EMOD); /* ready to quit? */
if (status >= 0) *errmsg = '\0';
if (garrulous && *errmsg) fprintf(stderr, "%s\n", errmsg);
if (prompt) printf("%s", prompt);
fflush(stdout);
if ((n = getline(ibuf, sizeof ibuf)) == 0)
if (modified && !rtq) {
fputs("?\n", stderr); /* give warning */
sprintf(errmsg, "file modified");
clearerr(stdin);
status = EMOD;
continue;
} else quit(0);
if (ibuf[n - 1] != '\n') { /* discard line */
sprintf(errmsg, "unexpected EOF");
clearerr(stdin);
status = ERR;
continue;
}
ibufp = ibuf;
if ((n = getlist()) >= 0 && (status = ckglob()) != 0) {
if (status > 0 && (status = doglob()) >= 0) {
curln = status;
continue;
}
} else if ((status = n) >= 0 && (status = docmd(0)) >= 0) {
if (!status || status
&& (status = doprnt(curln, curln, status)) >= 0)
continue;
}
switch (status) {
case EOF:
quit(0);
case EMOD:
if (rtq) quit(0);
fputs("?\n", stderr); /* give warning */
sprintf(errmsg, "file modified");
break;
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;
}
long mark['z'-'a'+1];
/* getnum: return a relative line number from the command buffer */
long
getnum(first)
int first;
{
pattern_t *srchpat;
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 ((srchpat = optpat()) == NULL)
return ERR;
else if (*ibufp == c)
ibufp++;
return first ? find(srchpat, (c == '/') ? 1 : 0) : ERR;
case '^':
case '-':
case '+':
return first ? curln : 1;
case '\'':
ibufp++;
return (islower(*ibufp) && first) ? mark[*ibufp++ - 'a'] : 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; \
} \
}
int Gflag = 0; /* interactive global command suffix */
/* ckglob: mark lines matching a pattern in the command buffer; return
global status */
ckglob()
{
pattern_t *glbpat;
char c, delim;
char *s;
int nomatch;
long n;
line_t *ptr;
int gflag = 0;
if ((c = *ibufp) == 'V' || c == 'G')
interactive++;
else if (c != 'g' && c != 'v')
return 0;
if (deflt(1, lastln) < 0 || (delim = *++ibufp) == ' ' || delim == '\n'
|| (glbpat = optpat()) == NULL)
return ERR;
if (*ibufp == delim)
ibufp++;
if (interactive) {
VRFYCMD(); /* set gflag */
Gflag = gflag;
}
for (n = 1, ptr = getptr(n); n <= lastln; n++, ptr = ptr->next) {
if ((s = gettxt(ptr)) == (char *) ERR)
return ERR;
ptr->len &= ~ACTV; /* zero ACTV bit */
if (line1 <= n && n <= line2
&& (!(nomatch = regexec(glbpat, s, 0, NULL, 0))
&& (c == 'g' || c == 'G')
|| nomatch && (c == 'v' || c == 'V')))
ptr->len |= ACTV;
}
return 1;
}
/* doglob: apply command list in the command buffer to the active
lines in a range; return command status */
long
doglob()
{
line_t *ptr = NULL;
long lc;
int status;
int n;
char *cmd = NULL;
if (!interactive && (cmd = getcmdv()) == NULL)
return ERR;
ureset();
for (;;) {
for (lc = 1, ptr = getptr(lc); lc <= lastln; lc++, ptr = ptr->next)
if (ptr->len & ACTV) /* active line */
break;
if (lc > lastln)
break;
ptr->len ^= ACTV; /* zero ACTV bit */
curln = lc;
if (interactive) {
/* print curln and get a command in global syntax */
if (doprnt(curln, curln, 0) < 0) {
interactive = 0;
freecmdv();
return ERR;
}
while ((n = getline(ibufp = ibuf, sizeof ibuf))
&& ibuf[n - 1] != '\n')
clearerr(stdin);
if (!n) {
sprintf(errmsg, "unexpected end of file");
interactive = 0;
freecmdv();
return ERR;
}
if (!strcmp(ibuf, "\n"))
continue;
if (!strcmp(ibuf, "&\n")) {
if (cmd == NULL) {
sprintf(errmsg, "null command");
interactive = 0;
freecmdv();
return ERR;
}
} else {
freecmdv();
if ((cmd = getcmdv()) == NULL) {
interactive = 0;
return ERR;
}
}
}
ibufp = cmd;
for (; *ibufp;)
if ((status = getlist()) < 0
|| (status = docmd(1)) < 0
|| (status > 0
&& (status = doprnt(curln, curln, status)) < 0)) {
freecmdv();
interactive = 0;
return status;
}
}
if (interactive && Gflag && doprnt(curln, curln, Gflag) < 0)
return ERR;
freecmdv();
interactive = 0;
return curln;
}
/* 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; \
}
/* 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 subpat */
#define SGF 010 /* newline found */
int usw = 0; /* if set, undo last undo */
int patlock = 0; /* if set, pattern not released by optpat() */
/* docmd: execute the next command in command buffer; return print
request, if any */
docmd(glob)
int glob;
{
static pattern_t *subpat = NULL;
static int sgflag = 0;
static char rhs[MAXLINE];
static char cmdbuf[MAXLINE];
pattern_t *tpat;
int c = 0;
char *fptr;
int gflag = 0;
long num;
int changed;
int subflags = 0;
char *sp, *tp;
skipblanks();
switch(*ibufp++) {
case '\n':
if (deflt(curln + !glob, curln + !glob) < 0
|| doprnt(line2, line2, 0) < 0)
return ERR;
break;
case '!':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
if (*ibufp == '!') {
subflags++;
ibufp++;
} else {
cmdbuf[0] = '\0';
for (;;) {
/* replace unescaped %s with file name */
if (sp = strchr(ibufp, '%'))
for (tp = ibufp; sp && oddesc(tp, sp);)
sp = strchr((tp = sp) + 1, '%');
if (sp) {
subflags++;
if (strlen(cmdbuf) + strlen(fnp) > sizeof cmdbuf) {
sprintf(errmsg, "command too long");
return ERR;
}
strncat(cmdbuf, ibufp, sp - ibufp);
strcat(cmdbuf, fnp);
ibufp = sp + 1;
} else {
sp = strchr(ibufp, '\n');
if (strlen(cmdbuf) + sp - ibufp + 1 > sizeof cmdbuf) {
sprintf(errmsg, "command too long");
return ERR;
}
strncat(cmdbuf, ibufp, sp - ibufp + 1);
ibufp = sp;
break;
}
}
}
VRFYCMD();
if (subflags) printf("%s", cmdbuf);
system(cmdbuf);
if (verbose) printf("!\n");
break;
case '=':
VRFYCMD();
printf("%d\n", nlines ? line2 : lastln);
break;
case 'a':
VRFYCMD();
if (!glob) ureset();
if (append(line2, glob) < 0)
return ERR;
break;
case 'c':
if (deflt(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (del(line1, line2) < 0 || append(curln, glob) < 0)
return ERR;
break;
case 'd':
if (deflt(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (del(line1, line2) < 0)
return ERR;
if (nextln(curln, lastln) != 0)
curln = nextln(curln, lastln);
modified = TRUE;
break;
case 'e':
if (modified && !rtq)
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;
}
if ((fptr = getfn()) == NULL)
return ERR;
VRFYCMD();
del(1, lastln);
ureset();
sbclose();
if (sbopen() < 0)
return ERR;
if (*fptr && *fptr != '!') strcpy(fnp, fptr);
if (doread(0, *fptr ? fptr : fnp) < 0) {
if (!garrulous) fprintf(stderr, "%s\n", errmsg);
return ERR;
}
ureset();
bzero(mark, sizeof mark);
modified = FALSE;
break;
case 'f':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
} else if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
}
if ((fptr = getfn()) == NULL)
return ERR;
VRFYCMD();
if (*fptr) strcpy(fnp, fptr);
printf("%s\n", fnp);
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 'h':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if (*errmsg) fprintf(stderr, "%s\n", errmsg);
break;
case 'i':
VRFYCMD();
if (!glob) ureset();
if (append(prevln(line2, lastln), glob) < 0)
return ERR;
break;
case 'j':
if (deflt(curln, curln + 1) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (join(line1, line2) < 0)
return ERR;
break;
case 'k':
if (!islower(c = *ibufp++)) {
sprintf(errmsg, "invalid mark character");
return ERR;
}
VRFYCMD();
mark[c-'a'] = line2;
break;
case 'l':
if (deflt(curln, curln) < 0)
return ERR;
gflag |= GLS;
VRFYCMD();
if (doprnt(line1, line2, gflag) < 0)
return ERR;
gflag = 0;
break;
case 'm':
/* Clean but inefficient move.
The inefficiency is outweighed since the requeue
alternative requires special handling by undo(). */
if (deflt(curln, curln) < 0)
return ERR;
GETLINE3(num);
if (line1 <= num && num < line2) {
sprintf(errmsg, "invalid destination");
return ERR;
}
VRFYCMD();
if (!glob) ureset();
if (transfer(num) < 0)
return ERR;
c = (num > line1) ? 0 : line2 - line1 + 1;
if (del(line1 + c, line2 + c) < 0)
return ERR;
curln = num + c;
modified = TRUE;
break;
case 'n':
if (deflt(curln, curln) < 0)
return ERR;
gflag |= GNP;
VRFYCMD();
if (doprnt(line1, line2, gflag) < 0)
return ERR;
gflag = 0;
break;
case 'P':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
prompt = prompt ? NULL : optarg ? optarg : defprompt;
break;
case 'p':
if (deflt(curln, curln) < 0)
return ERR;
gflag |= GPR;
VRFYCMD();
if (doprnt(line1, line2, gflag) < 0)
return ERR;
gflag = 0;
break;
case 'q':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if (modified)
return EMOD;
return (nlines == 0 && !glob) ? EOF : ERR;
case 'Q':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
return EOF;
case 'r':
if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
}
if (!nlines) line2 = lastln;
if ((fptr = getfn()) == NULL)
return ERR;
VRFYCMD();
if (!glob) ureset();
if (*fnp == '\0' && *fptr != '!') strcpy(fnp, fptr);
if ((num = doread(line2, *fptr ? fptr : fnp)) < 0) {
if (!garrulous) fprintf(stderr, "%s\n", errmsg);
return ERR;
}
else if (num != lastln)
modified = TRUE;
break;
case 's':
do {
switch(*ibufp) {
case '\n':
subflags |=SGF;
break;
case 'g':
subflags |= SGG;
ibufp++;
break;
case 'p':
subflags |= SGP;
ibufp++;
break;
case 'r':
subflags |= SGR;
ibufp++;
break;
default:
if (subflags) return ERR;
}
} while (subflags && *ibufp != '\n');
if (!(subflags & SGF))
sgflag &= 0xff;
tpat = subpat;
spl1();
if ((!subflags || (subflags & SGR))
&& (tpat = optpat()) == NULL)
return ERR;
if (tpat != subpat) {
if (subpat) {
regfree(subpat);
free(subpat);
}
subpat = tpat;
patlock = 1; /* reserve pattern */
}
spl0();
if (!subflags && (sgflag = getrhs(rhs, glob)) < 0)
return ERR;
if (glob)
sgflag |= GLB;
else
sgflag &= ~GLB;
if (subflags & SGG)
sgflag ^= GSG;
if (subflags & SGP)
sgflag ^= GPR, sgflag &= ~GLS;
do {
switch(*ibufp) {
case 'p':
sgflag |= GPR, ibufp++;
break;
case 'l':
sgflag |= GLS, ibufp++;
break;
case 'n':
sgflag |= GNP, ibufp++;
break;
default:
c++;
}
} while (!c);
if (deflt(curln, curln) < 0)
return ERR;
VRFYCMD();
if (!glob) ureset();
if ((changed = subst(subpat, rhs, sgflag)) < 0)
return ERR;
else if (changed)
modified = TRUE;
break;
case 't':
if (deflt(curln, curln) < 0)
return ERR;
GETLINE3(num);
VRFYCMD();
if (!glob) ureset();
if (transfer(num) < 0)
return ERR;
modified = TRUE;
break;
case 'u':
if (nlines > 0) {
sprintf(errmsg, "unexpected address");
return ERR;
}
VRFYCMD();
if (undo() < 0)
return ERR;
break;
case 'W':
case 'w':
if (*ibufp == 'q') {
gflag = EOF;
ibufp++;
} else if (!isspace(*ibufp)) {
sprintf(errmsg, "unexpected command suffix");
return ERR;
}
if ((fptr = getfn()) == NULL)
return ERR;
if (nlines == 0 && !lastln)
line1 = line2 = 0;
else if (deflt(1, lastln) < 0)
return ERR;
VRFYCMD();
if (*fnp == '\0' && *fptr != '!') strcpy(fnp, fptr);
if (dowrite(line1, line2, *fptr ? fptr : fnp, c == 'W' ? "a" : "w") < 0) {
if (!garrulous) fprintf(stderr, "%s\n", errmsg);
return ERR;
}
modified = FALSE;
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':
if (deflt(curln + 1, curln + 1) < 0)
return ERR;
if (isdigit(*ibufp))
rows = strtol(ibufp, &ibufp, 10);
VRFYCMD();
if (doprnt(line1, min(lastln, line1 + rows - 1), gflag) < 0)
return ERR;
gflag = 0;
break;
default:
sprintf(errmsg, "unknown command");
return ERR;
}
return gflag;
}
/* deflt: return status of line number range check */
deflt(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;
}
/* find: return the number of the next line matching a pattern in a
given direction. wrap around begin/end of line queue if necessary */
long
find(pat, dir)
pattern_t *pat;
int dir;
{
char *s;
long n = curln;
do {
n = dir ? nextln(n, lastln) : prevln(n, lastln);
if ((s = gettxt(getptr(n))) == (char *) ERR)
return ERR;
else if (s && !regexec(pat, s, 0, NULL, 0))
return n;
} while (n != curln);
sprintf(errmsg, "no match");
return ERR;
}
/* getfn: return pointer to file name in the command buffer */
char *
getfn()
{
static char file[MAXFNAME];
char *cp = file;
if (*ibufp != '\n') {
skipblanks();
if (*ibufp == '\n' || *ibufp == '\\' && *(ibufp + 1) == '\n') {
sprintf(errmsg, "invalid file name");
return NULL;
}
} else if (*fnp == '\0') {
sprintf(errmsg, "no current file name");
return NULL;
}
while ((*cp = *ibufp) != '\n' && cp - file < sizeof file)
cp++, ibufp++;
if (cp - file == sizeof file) {
sprintf(errmsg, "name too long");
return NULL;
}
*cp = '\0';
return file;
}
/* getrhs: extract substitution template from the command buffer */
getrhs(sub, glob)
char *sub;
int glob;
{
char delim;
if ((delim = *ibufp) == '\n') {
*sub = '\0';
return GPR;
} else if (makesub(sub, MAXLINE, 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 substitution template in the command buffer */
char *
makesub(sub, subsz, glob)
char *sub;
int subsz;
int glob;
{
int n = 0;
int size = 0;
char *cp = sub;
char delim = *ibufp++;
char c;
if (*ibufp == '%' && *(ibufp + 1) == delim) {
ibufp++;
return sub;
}
for (; *ibufp != delim && size < subsz; size++)
if ((c = *cp++ = *ibufp++) == '\n' && *ibufp == '\0') {
cp--, ibufp--;
break;
} else if (c != ESCHAR)
;
else if (++size == subsz)
break;
else if ((*cp++ = *ibufp++) != '\n')
;
else if (!glob)
while ((n = getline(ibufp = ibuf, sizeof ibuf)) == 0
|| ibuf[n - 1] != '\n')
clearerr(stdin);
else
/*NOTREACHED*/
;
if (size >= subsz) {
sprintf(errmsg, "substitution too long");
return NULL;
}
*cp = '\0';
return sub;
}
/* 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 lin[MAXLINE];
char *lp = lin;
undo_t *up = NULL;
for (curln = n;;) {
if (!glob) {
if ((l = getline(lin, sizeof lin)) == 0
|| lin[l - 1] != '\n') {
clearerr(stdin);
return l ? EOF : 0;
}
} else if (*(lp = ibufp) == '\0')
return 0;
else
while (*ibufp++ != '\n')
;
if (lp[0] == '.' && lp[1] == '\n') {
return 0;
}
spl1();
if (puttxt(lp) == (char *) ERR) {
spl0();
return ERR;
}
if (up) up->t = getptr(curln);
else up = getuptr(UADD, curln, curln);
spl0();
modified = 1;
}
}
#ifdef sun
/* subst: change all text matching a pattern in a range of lines according to
a substitution template; return status */
subst(pat, sub, gflag)
pattern_t *pat;
char *sub;
int gflag;
{
undo_t *up = NULL;
char *new;
line_t *bp, *ep, *np;
long ocl;
long nsubs = 0;
ep = getptr(curln = line2);
for (bp = getptr(line1); bp != ep->next; bp = bp->next)
if ((new = gettxt(bp)) == (char *) ERR)
return ERR;
else if ((new = regsub(pat, new, sub, gflag)) == (char *) ERR)
return ERR;
else if (!new) {
/* add copy of bp after current line - this avoids
overloading the undo structure, since only two
undo nodes are needed for the whole substitution;
the cost is high, but the less than if undo is
overloaded. */
if ((np = lpdup(bp)) == NULL)
return ERR;
spl1();
lpqueue(np);
if (up)
up->t = getptr(curln);
else up = getuptr(UADD, curln, curln);
spl0();
} else {
spl1();
do {
if ((new = puttxt(new)) == (char *) ERR) {
spl0();
return ERR;
}
if (up)
up->t = getptr(curln);
else up = getuptr(UADD, curln, curln);
} while (new != NULL);
spl0();
nsubs++;
if ((gflag & (GPR | GLS))
&& doprnt(curln, curln, gflag) < 0)
return ERR;
}
ocl = curln;
del(line1, line2);
curln = ocl - (line2 - line1 + 1);
if (nsubs == 0 && !(gflag & GLB)) {
sprintf(errmsg, "no match");
return ERR;
}
return 1;
}
#else /* sun */
/* subst: change all text matching a pattern in a range of lines according to
a substitution template; return status */
subst(pat, sub, gflag)
pattern_t *pat;
char *sub;
int gflag;
{
undo_t *up;
char *new;
long lc;
int nsubs = 0;
curln = prevln(line1, lastln);
for (lc = 0; lc <= line2 - line1; lc++) {
new = gettxt(getptr(curln = nextln(curln, lastln)));
if (new == (char *) ERR)
return ERR;
else if ((new = regsub(pat, new, sub, gflag)) == (char *) ERR)
return ERR;
else if (new) {
up = NULL;
del(curln, curln);
spl1();
do {
if ((new = puttxt(new)) == (char *) ERR) {
spl0();
return ERR;
}
if (up) up->t = getptr(curln);
else up = getuptr(UADD, curln, curln);
} while (new != NULL);
spl0();
nsubs++;
if ((gflag & (GPR | GLS))
&& doprnt(curln, curln, gflag) < 0)
return ERR;
}
}
if (nsubs == 0 && !(gflag & GLB)) {
sprintf(errmsg, "no match");
return ERR;
}
return 1;
}
#endif /* sun */
/* regsub: substitute possibly several expressions in a line of text
matched by a pattern according to a substitution template; return
pointer to the modified text */
char *
regsub(pat, txt, sub, gflag)
pattern_t *pat;
char *txt;
char *sub;
int gflag;
{
static char buf[MAXLINE];
char *eob = buf + sizeof buf - 1; /* -1 for '\n' */
char *new = buf;
int kth = gflag >> 8; /* substitute kth match only */
int chngd = 0;
int matchno = 0;
int n;
regmatch_t rm[SE_MAX];
if (!regexec(pat, txt, SE_MAX, rm, 0)) {
do {
if (!kth || kth == ++matchno) {
chngd++;
if ((n = rm[0].rm_so) >= eob - new) {
sprintf(errmsg, "line too long");
return (char *) ERR;
}
strncpy(new, txt, n);
if (!(new = subcat(txt, rm, sub, new += n, eob))) {
sprintf(errmsg, "line too long");
return (char *) ERR;
}
} else {
if ((n = rm[0].rm_eo) >= eob - new) {
sprintf(errmsg, "line too long");
return (char *) ERR;
}
strncpy(new, txt, n);
new += n;
}
txt += rm[0].rm_eo;
} while (*txt && (!chngd || (gflag & GSG) && rm[0].rm_eo)
&& !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
if ((n = strlen(txt)) >= eob - new) {
sprintf(errmsg, "line too long");
return (char *) ERR;
} else if (n > 0 && !rm[0].rm_eo && (gflag & GSG)) {
sprintf(errmsg, "infinite loop");
return (char *) ERR;
}
strcpy(new, txt);
strcpy(new + n, "\n");
}
return chngd ? buf : NULL;
}
/* join: replace a range of lines with the joined text of those lines */
join(from, to)
long from;
long to;
{
char buf[MAXLINE] = "";
char *s;
int len = 0;
int size = 0;
line_t *bp, *ep;
if (from == to)
return 0;
ep = getptr(nextln(to, lastln));
for (bp = getptr(from); bp != ep; bp = bp->next, size += len) {
if ((s = gettxt(bp)) == (char *) ERR)
return ERR;
if (size + (len = strlen(s)) >= sizeof buf - 1) {
sprintf(errmsg, "line too long");
return ERR;
}
strcpy(buf + size, s);
}
strcpy(buf + size, "\n");
del(from, to);
curln = from - 1;
spl1();
if (puttxt(buf) == (char *) ERR) {
spl0();
return ERR;
}
getuptr(UADD, curln, curln);
spl0();
modified = TRUE;
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(getptr(nl))) == NULL) {
spl0();
return ERR;
}
lpqueue(lp);
if (up) up->t = lp;
else up = getuptr(UADD, curln, curln);
spl0();
}
for (nl += nt, lc = line2 + nt; nl <= lc; nl += 2, lc++) {
spl1();
if ((lp = lpdup(getptr(nl))) == NULL) {
spl0();
return ERR;
}
lpqueue(lp);
if (up) up->t = lp;
else up = getuptr(UADD, curln, curln);
spl0();
}
return 0;
}
/* del: delete a range of lines */
del(from, to)
long from, to;
{
line_t *before, *after;
spl1();
getuptr(UDEL, from, to);
after = getptr(nextln(to, lastln));
before = getptr(prevln(from, lastln)); /* this getptr last! */
requeue(before, after);
lastln -= to - from + 1;
curln = prevln(from, lastln);
spl0();
return 0;
}
/* subcat: modify text according to a substitution template;
return pointer to modified text */
char *
subcat(boln, rm, sub, new, newend)
char *boln;
regmatch_t *rm;
char *sub, *new, *newend;
{
char *from = boln + rm[0].rm_so;
char *to = boln + rm[0].rm_eo;
char *cp = new, *cp2, *cp3;
for (; *sub && cp < newend ; sub++)
if (*sub == DITTO)
for (cp2 = from; cp2 < to;) {
*cp++ = *cp2++;
if (cp >= newend)
break;
}
else if (*sub == ESCHAR && '1' <= *++sub && *sub <= '9'
&& rm[*sub - '0'].rm_so >= 0
&& rm[*sub - '0'].rm_eo >= 0) {
cp2 = boln + rm[*sub - '0'].rm_so;
cp3 = boln + rm[*sub - '0'].rm_eo;
while (cp2 < cp3) {
*cp++ = *cp2++;
if (cp >= newend)
break;
}
} else *cp++ = *sub;
if (cp >= newend)
return NULL;
*cp = '\0';
return cp;
}
/* doprnt: print a range of lines to stdout */
doprnt(from, to, gflag)
long from;
long to;
int gflag;
{
line_t *bp;
line_t *ep;
char *s;
ep = getptr(nextln(to, lastln));
for (bp = getptr(from); bp != ep; bp = bp->next) {
if ((s = gettxt(bp)) == (char *) ERR)
return ERR;
prntln(s, curln = from++, gflag);
}
return 0;
}
/* prntln: print text to stdout */
void
prntln(s, n, gflag)
char *s;
long n;
int gflag;
{
int col = 0;
if (gflag & GNP) {
printf("%ld\t", n);
col = 8;
}
for (; *s; 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((*s >> 6) + '0');
putchar((*s >> 3) + '0');
putchar((*s & 07) + '0');
col += 2;
} else if (*s == '\\')
fputs("\\\\", stdout);
else {
putchar(*s);
col--;
}
}
col++;
} else
putchar(*s);
}
if (gflag & GLS)
putchar('$');
putchar('\n');
}
int nullchar; /* null chars read */
int newline_added; /* long record split across lines */
/* doread: read a text file into the editor buffer; return line count */
long
doread(n, fn)
long n;
char *fn;
{
FILE *fp;
char buf[MAXLINE];
unsigned long size = 0;
undo_t *up = NULL;
int len;
line_t *lp = getptr(n);
nullchar = newline_added = 0;
if ((fp = (*fn == '!') ? popen(fn + 1, "r") : desopen(esctos(fn), "r")) == NULL) {
sprintf(errmsg, "cannot open file");
return ERR;
}
for (curln = n; (len = sgetline(buf, MAXLINE, fp)) > 0; size += len) {
spl1();
if (puttxt(buf) == (char *) ERR) {
spl0();
return ERR;
}
lp = lp->next;
if (up) up->t = lp;
else up = getuptr(UADD, curln, curln);
spl0();
}
(*fn == '!') ? pclose(fp) : fclose(fp);
if (nullchar)
fputs("null(s) discarded\n", stderr);
if (newline_added)
fputs("newline(s) added\n", stderr);
if (des) size += 8 - size % 8;
fprintf(stderr, verbose ? "%lu\n" : "", size);
return 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;
unsigned long size = 0;
char *s = NULL;
line_t *lp;
if ((fp = ((*fn == '!') ? popen(fn + 1, "w") : desopen(esctos(fn), mode))) == NULL) {
sprintf(errmsg, "cannot open file");
return ERR;
}
if (n && !des)
for (lp = getptr(n); n <= m; n++, lp = lp->next) {
if ((s = gettxt(lp)) == (char *) ERR)
return ERR;
else if (fputs(strcat(s, "\n"), fp) < 0) {
sprintf(errmsg, "cannot write file");
return ERR;
}
size += (lp->len & ~ACTV) + 1; /* +1 '\n' */
}
else if (n)
for (lp = getptr(n); n <= m; n++, lp = lp->next) {
if ((s = gettxt(lp)) == (char *) ERR)
return ERR;
while (*s)
if (desputc(*s++, fp) < 0) {
sprintf(errmsg, "cannot write file");
return ERR;
}
if (desputc('\n', fp) < 0) {
sprintf(errmsg, "cannot write file");
return ERR;
}
size += (lp->len & ~ACTV) + 1; /* +1 '\n' */
}
if (des) {
desputc(EOF, fp); /* flush buffer */
size += 8 - size % 8; /* adjust DES size */
}
(*fn == '!') ? pclose(fp) : fclose(fp);
fprintf(stderr, verbose ? "%lu\n" : "", size);
return n ? m - n + 1 : 0;
}
#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 */
long ucurln;
/* getuptr: return pointer to intialized undo node */
undo_t *
getuptr(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)
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 = getptr(to);
ustack[u_p].h = getptr(from);
return ustack + u_p++;
}
/* out of memory - release undo stack */
ureset();
free(ustack);
ustack = NULL;
usize = 0;
return NULL;
}
/* undo: undo last change to the editor buffer */
undo()
{
long n = usw ? 0 : u_p - 1;
int i = usw ? 1 : -1;
long j = u_p;
long ocurln = curln;
if (u_p == 0) {
sprintf(errmsg, "file unmodified");
return ERR;
}
spl1();
for (; j--; n += i)
switch(ustack[n].type ^ usw) {
case UADD:
getptr(0); /* this getptr last! */
requeue(ustack[n].h->prev, ustack[n].t->next);
lastln -= getrange(ustack[n].h, ustack[n].t);
break;
case UDEL:
getptr(0); /* this getptr last! */
requeue(ustack[n].h->prev, ustack[n].h);
requeue(ustack[n].t, ustack[n].t->next);
lastln += getrange(ustack[n].h, ustack[n].t);
break;
default:
/*NOTREACHED*/
;
}
curln = ucurln;
ucurln = ocurln;
usw = 1 - usw;
spl0();
return 0;
}
/* ureset: clear the undo stack */
void
ureset()
{
line_t *lp, *ep, *tl;
while (u_p--)
if ((ustack[u_p].type ^ usw) == UDEL) {
ep = ustack[u_p].t->next;
for (lp = ustack[u_p].h; lp != ep; lp = tl) {
tl = lp->next;
free(lp);
}
}
u_p = usw = 0;
ucurln = curln;
}
/* sgetline: read a line of text up a maximum size from a file; return
line length */
sgetline(buf, size, fp)
char *buf;
int size;
FILE *fp;
{
int c = EOF;
char *cp = buf;
/* pull des out of loop */
if (!des)
while (cp - buf < size - 1 && (c = getc(fp)) != EOF && c != '\n')
c && (*cp++ = c) || (nullchar = 1);
else
while (cp - buf < size - 1 && (c = desgetc(fp)) != EOF && c != '\n')
c && (*cp++ = c) || (nullchar = 1);
if (c == '\n')
*cp++ = c;
else if (c == EOF) {
if (cp - buf) {
*cp++ = '\n';
newline_added = 1;
}
} else {
ungetc(c, fp);
*(cp - 1) = '\n';
newline_added = 1;
}
*cp = '\0';
return cp - buf;
}
int sg_ct = 0; /* count for desgetc */
int sp_ct = 0; /* count for desputc */
/* desopen: open a file and initialize DES; return file pointer */
FILE *
desopen(fn, mode)
char *fn;
char *mode;
{
FILE *fp;
#ifdef DES
sg_ct = 0;
sp_ct = 0;
cbcinit();
#endif
if ((fp = fopen(fn, mode)) != NULL)
setvbuf(fp, NULL, _IOFBF, BUFSIZ);
return fp;
}
/* desgetc: return next char in a file */
desgetc(fp)
FILE *fp;
{
#ifdef DES
static char buf[8];
static int n = 0;
if (n >= sg_ct) {
n = 0;
sg_ct = cbcdec(buf, fp);
}
return (sg_ct > 0) ? buf[n++] : EOF;
#endif
}
/* desputc: write a char to a file */
desputc(c, fp)
char c;
FILE *fp;
{
#ifdef DES
static char buf[8];
static int n = 0;
if (n == sizeof buf) {
sp_ct = cbcenc(buf, n, fp);
n = 0;
}
if (c == EOF) {
sp_ct = cbcenc(buf, n, fp);
n = 0;
}
return (sp_ct >= 0 && c != EOF) ? (buf[n++] = c) : EOF;
#endif
}
/* getline: read a line of text up a maximum size from stdin; return
line length */
getline(buf, n)
char *buf;
int n;
{
static char oc = '\0'; /* overflow character */
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 */
if (n < 2)
return 0;
if (oc != '\0') {
buf[i++] = oc;
oc = '\0';
}
for (;;)
switch (read(0, &c, 1)) {
default:
oi = 0;
if (i < n - 1) {
if ((buf[i++] = c) != '\n')
continue;
lineno++; /* script line no. */
buf[i] = '\0';
return i;
}
oc = c;
buf[i] = '\0';
return i;
case 0:
if (i != oi) {
oi = i;
continue;
}
/* fall through */
case -1:
if (i) buf[i] = '\0';
return i;
}
}
char *gbuf = NULL;
#define strip_trailing_esc \
*(gbuf + l - 2) = '\n', *(gbuf + l - 1) = '\0', l--
/* getcmdv: get a command-list from the command buffer */
char *
getcmdv()
{
int l, n, m = (sizeof ibuf);
char *t;
if ((gbuf = (char *) malloc(m)) == NULL) {
sprintf(errmsg, "out of memory");
return NULL;
}
strcpy(gbuf, ibufp);
if ((l = strlen(gbuf)) < 2 || !oddesc(gbuf, gbuf + l - 1))
return gbuf;
strip_trailing_esc;
for (;;) {
t = gbuf;
if ((n = getline(ibuf, m)) == 0 || ibuf[n - 1] != '\n'
|| (l += n) >= m
&& (t = realloc(gbuf, m += sizeof ibuf)) == NULL) {
sprintf(errmsg, "out of memory");
freecmdv();
return NULL;
}
gbuf = t;
strcat(gbuf, ibuf);
if (n < 2 || !oddesc(gbuf, gbuf + l - 1))
break;
strip_trailing_esc;
}
return gbuf;
}
/* lpdup: duplicate a line node */
line_t *
lpdup(lp)
line_t *lp;
{
line_t *np;
if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
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);
}
/* freecmdv: free memory used by a command list */
void
freecmdv()
{
free(gbuf);
gbuf = NULL;
}
/* getrange: return the number of nodes in a list */
long
getrange(h, t)
line_t *h;
line_t *t;
{
long n = 1;
for (; h != t; h = h->next)
n++;
return n;
}
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);
}
char hup[MAXFNAME] = "ed.hup"; /* hup file name */
void
dohup(signo)
int signo;
{
char *s;
int n;
sigflags &= ~(1 << signo);
if (lastln && dowrite(1, lastln, hup, "w") < 0
&& (s = getenv("HOME")) != NULL
&& (n = strlen(s)) + 8 < sizeof hup) { /* "ed.hup" + '/' */
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;
{
sigflags &= ~(1 << signo);
fputs("\n?\n", stderr);
sprintf(errmsg, "interrupt");
longjmp(env, -1);
}
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;
}
}
/* esctos: return pointer to copy of string stripped of escape characters
- ignore trailing escape */
char *
esctos(s)
char *s;
{
static char file[MAXFNAME];
char *t = file;
while (*t++ = (*s == '\\') ? *++s : *s)
s++;
return file;
}
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