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03d27b7806
sbase/ed.c
Roberto E. Vargas Caballero 03d27b7806 ed: Reset modflag in clearbuf() 
For the same reason we don't care about the state of
the buffer in clearundo() we can reset modflag in
clearbuf(), because after calling it we don't want
to know anything about the previous state.
2016-01-01 10:39:59 +00:00

1397 lines
22 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <fcntl.h>
#include <regex.h>
#include <unistd.h>
#include <ctype.h>
#include <limits.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#define REGEXSIZE 100
#define LINESIZE 80
#define NUMLINES 32
#define CACHESIZ 4096
struct hline {
off_t seek;
char global;
int next, prev;
};
struct undo {
int curln;
size_t nr, cap;
struct link {
int to1, from1;
int to2, from2;
} *vec;
};
static char *prompt = "*";
static regex_t *pattern;
static regmatch_t matchs[10];
static char *lastre;
static int optverbose, optprompt, exstatus, optdiag = 1;
static int marks['z' - 'a'];
static int nlines, line1, line2;
static int curln, lastln, ocurln;
static jmp_buf savesp;
static char *lasterr;
static size_t idxsize, lastidx;
static struct hline *zero;
static char *text;
static char savfname[FILENAME_MAX];
static char tmpname[FILENAME_MAX];
static size_t sizetxt, memtxt;
static int scratch;
static int pflag, modflag, uflag, gflag;
static size_t csize;
static char *cmdline;
static char *ocmdline;
static size_t cmdsiz, cmdcap;
static int repidx;
static char *rhs;
static char *lastmatch;
static struct undo udata;
static int newcmd;
static void
discard(void)
{
int c;
/* discard until end of line */
if (repidx < 0 &&
((cmdsiz > 0 && cmdline[cmdsiz-1] != '\n') || cmdsiz == 0)) {
while ((c = getchar()) != '\n' && c != EOF)
/* nothing */;
}
}
static void undo(void);
static void
error(char *msg)
{
exstatus = 1;
lasterr = msg;
fputs("?\n", stderr);
if (optverbose)
fprintf(stderr, "%s\n", msg);
if (!newcmd)
undo();
discard();
curln = ocurln;
longjmp(savesp, 1);
}
static int
nextln(int line)
{
++line;
return (line > lastln) ? 0 : line;
}
static int
prevln(int line)
{
--line;
return (line < 0) ? lastln : line;
}
static char *
addchar(char c, char *t, size_t *capacity, size_t *size)
{
size_t cap = *capacity, siz = *size;
if (siz >= cap &&
(cap > SIZE_MAX - LINESIZE ||
(t = realloc(t, cap += LINESIZE)) == NULL))
error("out of memory");
t[siz++] = c;
*size = siz;
*capacity = cap;
return t;
}
static int
input(void)
{
int c;
if (repidx >= 0)
return ocmdline[repidx++];
if ((c = getchar()) != EOF)
cmdline = addchar(c, cmdline, &cmdcap, &cmdsiz);
return c;
}
static int
back(int c)
{
if (repidx > 0) {
--repidx;
} else {
ungetc(c, stdin);
if (c != EOF)
--cmdsiz;
}
return c;
}
static int
makeline(char *s, int *off)
{
struct hline *lp;
size_t len;
char c, *begin = s;
if (lastidx >= idxsize) {
if (idxsize > SIZE_MAX - NUMLINES ||
!(lp = realloc(zero, (idxsize + NUMLINES) * sizeof(*lp))))
error("out of memory");
idxsize += NUMLINES;
zero = lp;
}
lp = zero + lastidx;
while ((c = *s) && *s != '\n')
++s;
if (c == '\n')
++s;
len = s - begin;
if (off)
*off = len;
if (len > 0)
if ((lp->seek = lseek(scratch, 0, SEEK_END)) < 0 ||
write(scratch, begin, len) < 0) {
error("input/output error");
}
++lastidx;
return lp - zero;
}
static int
getindex(int line)
{
struct hline *lp;
int n;
for (n = 0, lp = zero; n != line; ++n)
lp = zero + lp->next;
return lp - zero;
}
static char *
gettxt(int line)
{
static char buf[CACHESIZ];
static off_t lasto;
struct hline *lp;
off_t off, block;
ssize_t n;
char *p;
lp = zero + getindex(line);
off = lp->seek;
sizetxt = 0;
repeat:
if (!csize || off < lasto || off - lasto >= csize) {
block = off & ~(CACHESIZ-1);
if (lseek(scratch, block, SEEK_SET) < 0 ||
(n = read(scratch, buf, CACHESIZ)) < 0) {
error("input/output error");
}
csize = n;
lasto = block;
}
for (p = buf + off - lasto; p < buf + csize && *p != '\n'; ++p) {
++off;
text = addchar(*p, text, &memtxt, &sizetxt);
}
if (csize && p == buf + csize)
goto repeat;
text = addchar('\n', text, &memtxt, &sizetxt);
text = addchar('\0', text, &memtxt, &sizetxt);
return text;
}
static void
setglobal(int i, int v)
{
zero[getindex(i)].global = v;
}
static void
clearundo(void)
{
free(udata.vec);
udata.vec = NULL;
newcmd = udata.nr = udata.cap = 0;
modflag = 0;
}
static void
relink(int to1, int from1, int from2, int to2)
{
struct link *p;
if (newcmd) {
clearundo();
udata.curln = ocurln;
}
if (udata.nr >= udata.cap) {
size_t siz = (udata.cap + 10) * sizeof(struct link);
if ((p = realloc(udata.vec, siz)) == NULL)
error("out of memory");
udata.vec = p;
udata.cap = udata.cap + 10;
}
p = &udata.vec[udata.nr++];
p->from1 = from1;
p->to1 = zero[from1].next;
p->from2 = from2;
p->to2 = zero[from2].prev;
zero[from1].next = to1;
zero[from2].prev = to2;
modflag = 1;
}
static void
undo(void)
{
struct link *p;
if (udata.nr == 0)
return;
for (p = &udata.vec[udata.nr-1]; udata.nr--; --p) {
zero[p->from1].next = p->to1;
zero[p->from2].prev = p->to2;
}
free(udata.vec);
udata.vec = NULL;
udata.cap = 0;
curln = udata.curln;
}
static void
inject(char *s)
{
int off, k, begin, end;
begin = getindex(curln);
end = getindex(nextln(curln));
while (*s) {
k = makeline(s, &off);
s += off;
relink(k, begin, k, begin);
relink(end, k, end, k);
++lastln;
++curln;
begin = k;
}
}
static void
clearbuf()
{
if (scratch)
close(scratch);
remove(tmpname);
free(zero);
zero = NULL;
scratch = csize = idxsize = lastidx = curln = lastln = 0;
modflag = lastln = curln = 0;
}
static void
setscratch()
{
int k;
clearbuf();
clearundo();
strcpy(tmpname, "ed.XXXXXX");
if ((scratch = mkstemp(tmpname)) < 0) {
/* try /tmp if cwd is not writable */
strcpy(tmpname, "/tmp/ed.XXXXXX");
if ((scratch = mkstemp(tmpname)) < 0)
error("failed to create scratch file");
}
if ((k = makeline("", NULL)))
error("input/output error in scratch file");
relink(k, k, k, k);
clearundo();
}
static void
compile(int delim)
{
int n, ret, c,bracket;
static size_t siz, cap;
static char buf[BUFSIZ];
if (!isgraph(delim))
error("invalid pattern delimiter");
bracket = siz = 0;
for (n = 0;; ++n) {
if ((c = input()) == delim && !bracket)
break;
if (c == '\n' || c == EOF) {
back(c);
break;
}
if (c == '\\') {
lastre = addchar(c, lastre, &cap, &siz);
c = input();
} else if (c == '[') {
bracket = 1;
} else if (c == ']') {
bracket = 0;
}
lastre = addchar(c, lastre, &cap, &siz);
}
if (n == 0) {
if (!pattern)
error("no previous pattern");
return;
}
lastre = addchar('\0', lastre, &cap, &siz);
if (pattern)
regfree(pattern);
if (!pattern && (!(pattern = malloc(sizeof(*pattern)))))
error("out of memory");
if ((ret = regcomp(pattern, lastre, REG_NEWLINE))) {
regerror(ret, pattern, buf, sizeof(buf));
error(buf);
}
}
static int
match(int num)
{
lastmatch = gettxt(num);
return !regexec(pattern, lastmatch, 10, matchs, 0);
}
static int
rematch(int num)
{
lastmatch += matchs[0].rm_eo;
return !regexec(pattern, lastmatch, 10, matchs, 0);
}
static int
search(int way)
{
int i;
i = curln;
do {
i = (way == '?') ? prevln(i) : nextln(i);
if (match(i))
return i;
} while (i != curln);
error("invalid address");
return -1; /* not reached */
}
static void
skipblank(void)
{
char c;
while ((c = input()) == ' ' || c == '\t')
/* nothing */;
back(c);
}
static int
getnum(void)
{
int ln, n, c;
for (ln = 0; isdigit(c = input()); ln += n) {
if (ln > INT_MAX/10)
goto invalid;
n = c - '0';
ln *= 10;
if (INT_MAX - ln < n)
goto invalid;
}
back(c);
return ln;
invalid:
error("invalid address");
return -1; /* not reached */
}
static int
linenum(int *line)
{
int ln, c;
skipblank();
switch (c = input()) {
case '.':
ln = curln;
break;
case '\'':
skipblank();
if (!isalpha(c = input()))
error("invalid mark character");
if (!(ln = marks[c]))
error("invalid address");
break;
case '$':
ln = lastln;
break;
case '?':
case '/':
compile(c);
ln = search(c);
break;
case '^':
case '-':
case '+':
ln = curln;
back(c);
break;
default:
back(c);
if (isdigit(c))
ln = getnum();
else
return 0;
break;
}
*line = ln;
return 1;
}
static int
address(int *line)
{
int ln, sign, c, num;
if (!linenum(&ln))
return 0;
for (;;) {
skipblank();
if ((c = input()) != '+' && c != '-' && c != '^')
break;
sign = c == '+' ? 1 : -1;
num = isdigit(back(input())) ? getnum() : 1;
num *= sign;
if (INT_MAX - ln < num)
goto invalid;
ln += num;
}
back(c);
if (ln < 0 || ln > lastln)
error("invalid address");
*line = ln;
return 1;
invalid:
error("invalid address");
return -1; /* not reached */
}
static void
getlst()
{
int ln, c;
if ((c = input()) == ',') {
line1 = 1;
line2 = lastln;
nlines = lastln;
return;
} else if (c == ';') {
line1 = curln;
line2 = lastln;
nlines = lastln - curln + 1;
return;
}
back(c);
line2 = curln;
for (nlines = 0; address(&ln); ) {
line1 = line2;
line2 = ln;
++nlines;
skipblank();
if ((c = input()) != ',' && c != ';') {
back(c);
break;
}
if (c == ';')
curln = line2;
}
if (nlines > 2)
nlines = 2;
else if (nlines <= 1)
line1 = line2;
}
static void
deflines(int def1, int def2)
{
if (!nlines) {
line1 = def1;
line2 = def2;
}
if (line1 > line2 || line1 < 0 || line2 > lastln)
error("invalid address");
}
static void
dowrite(char *fname, int trunc)
{
FILE *fp;
int i, line;
if (!(fp = fopen(fname, (trunc) ? "w" : "a")))
error("input/output error");
line = curln;
for (i = line1; i <= line2; ++i)
fputs(gettxt(i), fp);
curln = line2;
if (fclose(fp))
error("input/output error");
strcpy(savfname, fname);
modflag = 0;
curln = line;
}
static void
doread(char *fname)
{
size_t cnt;
ssize_t n;
char *p;
FILE *aux;
static size_t len;
static char *s;
static FILE *fp;
if (fp)
fclose(fp);
if (!(fp = fopen(fname, "r")))
error("input/output error");
curln = line2;
for (cnt = 0; (n = getline(&s, &len, fp)) > 0; cnt += (size_t)n) {
if (s[n-1] != '\n') {
if (len == SIZE_MAX || !(p = realloc(s, ++len)))
error("out of memory");
s = p;
s[n-1] = '\n';
s[n] = '\0';
}
inject(s);
}
printf("%zu\n", cnt);
aux = fp;
fp = NULL;
if (fclose(aux))
error("input/output error");
if (savfname[0] == '\0') {
modflag = 0;
clearundo();
strcpy(savfname, fname);
}
}
static void
doprint(void)
{
int i, c;
char *s, *str;
if (line1 <= 0 || line2 > lastln)
error("incorrect address");
for (i = line1; i <= line2; ++i) {
if (pflag == 'n')
printf("%d\t", i);
for (s = gettxt(i); (c = *s) != '\n'; ++s) {
if (pflag != 'l')
goto print_char;
switch (c) {
case '$':
str = "\\$";
goto print_str;
case '\t':
str = "\\t";
goto print_str;
case '\b':
str = "\\b";
goto print_str;
case '\\':
str = "\\\\";
goto print_str;
default:
if (!isprint(c)) {
printf("\\x%x", 0xFF & c);
break;
}
print_char:
putchar(c);
break;
print_str:
fputs(str, stdout);
break;
}
}
if (pflag == 'l')
fputs("$", stdout);
putc('\n', stdout);
}
curln = i - 1;
}
static void
dohelp(void)
{
if (lasterr)
fprintf(stderr, "%s\n", lasterr);
}
static void
chkprint(int flag)
{
char c;
if (flag) {
if ((c = input()) == 'p' || c == 'l' || c == 'n')
pflag = c;
else
back(c);
}
if (input() != '\n')
error("invalid command suffix");
}
static char *
getfname(void)
{
int c;
char *bp;
static char fname[FILENAME_MAX];
skipblank();
for (bp = fname; bp < &fname[FILENAME_MAX]; *bp++ = c) {
if ((c = input()) == EOF || c == '\n')
break;
}
if (bp == fname) {
if (savfname[0] == '\0')
error("no current filename");
return savfname;
} else if (bp == &fname[FILENAME_MAX]) {
error("file name too long");
} else {
*bp = '\0';
return fname;
}
return NULL; /* not reached */
}
static void
append(int num)
{
char *s = NULL;
size_t len = 0;
curln = num;
while (getline(&s, &len, stdin) > 0) {
if (*s == '.' && s[1] == '\n')
break;
inject(s);
}
free(s);
}
static void
delete(int from, int to)
{
int lto, lfrom;
if (!from)
error("incorrect address");
lfrom = getindex(prevln(from));
lto = getindex(nextln(to));
lastln -= to - from + 1;
curln = (from > lastln) ? lastln : from;;
relink(lto, lfrom, lto, lfrom);
}
static void
move(int where)
{
int before, after, lto, lfrom;
if (!line1 || (where >= line1 && where <= line2))
error("incorrect address");
before = getindex(prevln(line1));
after = getindex(nextln(line2));
lfrom = getindex(line1);
lto = getindex(line2);
relink(after, before, after, before);
if (where < line1) {
curln = where + line1 - line2 + 1;
} else {
curln = where;
where -= line1 - line2 + 1;
}
before = getindex(where);
after = getindex(nextln(where));
relink(lfrom, before, lfrom, before);
relink(after, lto, after, lto);
}
static void
join(void)
{
int i;
char *t, c;
size_t len = 0, cap = 0;
static char *s;
free(s);
for (s = NULL, i = line1; i <= line2; i = nextln(i)) {
for (t = gettxt(i); (c = *t) != '\n'; ++t)
s = addchar(*t, s, &cap, &len);
}
s = addchar('\n', s, &cap, &len);
s = addchar('\0', s, &cap, &len);
delete(line1, line2);
inject(s);
free(s);
}
static void
scroll(int num)
{
int i;
if (!line1 || line1 == lastln)
error("incorrect address");
for (i = line1; i <= line1 + num && i <= lastln; ++i)
fputs(gettxt(i), stdout);
curln = i;
}
static void
copy(int where)
{
int i;
if (!line1 || (where >= line1 && where <= line2))
error("incorrect address");
curln = where;
for (i = line1; i <= line2; ++i)
inject(gettxt(i));
}
static void
quit(void)
{
clearbuf();
exit(exstatus);
}
static void
execsh(void)
{
static char *cmd;
static size_t siz, cap;
char c, *p;
int repl = 0;
skipblank();
if ((c = input()) != '!') {
back(c);
siz = 0;
} else if (cmd) {
--siz;
repl = 1;
} else {
error("no previous command");
}
while ((c = input()) != EOF && c != '\n') {
if (c == '%' && (siz == 0 || cmd[siz - 1] != '\\')) {
if (savfname[0] == '\0')
error("no current filename");
repl = 1;
for (p = savfname; *p; ++p)
cmd = addchar(*p, cmd, &cap, &siz);
} else {
cmd = addchar(c, cmd, &cap, &siz);
}
}
cmd = addchar('\0', cmd, &cap, &siz);
if (repl)
puts(cmd);
system(cmd);
puts("!");
}
static void
getrhs(int delim)
{
int c;
size_t siz, cap;
static char *s;
free(s);
s = NULL;
siz = cap = 0;
while ((c = input()) != '\n' && c != EOF && c != delim) {
if (c == '\\') {
if ((c = input()) == '&' || isdigit(c))
s = addchar(c, s, &siz, &cap);
}
s = addchar(c, s, &siz, &cap);
}
s = addchar('\0', s, &siz, &cap);
if (c == EOF)
error("invalid pattern delimiter");
if (c == '\n') {
pflag = 'p';
back(c);
}
if (!strcmp("%", s)) {
free(s);
if (!rhs)
error("no previous substitution");
} else {
free(rhs);
rhs = s;
}
s = NULL;
}
static int
getnth(void)
{
int c;
if ((c = input()) == 'g') {
return -1;
} else if (isdigit(c)) {
if (c == '0')
return -1;
return c - '0';
} else {
back(c);
return 1;
}
}
static void
addpre(char **s, size_t *cap, size_t *siz)
{
char *p;
for (p = lastmatch; p < lastmatch + matchs[0].rm_so; ++p)
*s = addchar(*p, *s, cap, siz);
}
static void
addpost(char **s, size_t *cap, size_t *siz)
{
char c, *p;
for (p = lastmatch + matchs[0].rm_eo; (c = *p); ++p)
*s = addchar(c, *s, cap, siz);
*s = addchar('\0', *s, cap, siz);
}
static void
addsub(char **s, size_t *cap, size_t *siz)
{
char *end, *q, *p, c;
int sub;
for (p = rhs; (c = *p); ++p) {
switch (c) {
case '&':
sub = 0;
goto copy_match;
case '\\':
if ((c = *++p) == '\0')
return;
if (!isdigit(c))
goto copy_char;
sub = c - '0';
copy_match:
q = lastmatch + matchs[sub].rm_so;
end = lastmatch + matchs[sub].rm_eo;
while (q < end)
*s = addchar(*q++, *s, cap, siz);
break;
default:
copy_char:
*s = addchar(c, *s, cap, siz);
break;
}
}
}
static void
subline(int num, int nth)
{
int m, changed;
static char *s;
static size_t siz, cap;
siz = 0;
for (m = match(num); m; m = rematch(num)) {
addpre(&s, &cap, &siz);
if (--nth > 0)
continue;
changed = 1;
addsub(&s, &cap, &siz);
if (nth == 0)
break;
}
if (!changed)
return;
addpost(&s, &cap, &siz);
delete(num, num);
curln = prevln(num);
inject(s);
}
static void
subst(int nth)
{
int i;
for (i = line1; i <= line2; ++i)
subline(i, nth);
}
static void
docmd(void)
{
char *s, cmd;
int rep = 0, c, line3, num, trunc;
repeat:
skipblank();
cmd = input();
trunc = pflag = 0;
switch (cmd) {
case '&':
skipblank();
chkprint(0);
if (!ocmdline)
error("no previous command");
rep = 1;
repidx = 0;
getlst();
goto repeat;
case '!':
execsh();
break;
case EOF:
if (cmdsiz == 0)
quit();
case '\n':
if (gflag && uflag)
return;
num = gflag ? curln : curln+1;
deflines(num, num);
pflag = 'p';
goto print;
case 'l':
case 'n':
case 'p':
back(cmd);
chkprint(1);
deflines(curln, curln);
goto print;
case 'g':
case 'G':
case 'v':
case 'V':
error("cannot nest global commands");
case 'H':
if (nlines > 0)
goto unexpected;
chkprint(0);
optverbose ^= 1;
break;
case 'h':
if (nlines > 0)
goto unexpected;
chkprint(0);
dohelp();
break;
case 'w':
trunc = 1;
case 'W':
deflines(nextln(0), lastln);
dowrite(getfname(), trunc);
break;
case 'r':
if (nlines > 1)
goto bad_address;
deflines(lastln, lastln);
doread(getfname());
break;
case 'd':
chkprint(1);
deflines(curln, curln);
delete(line1, line2);
break;
case '=':
if (nlines > 1)
goto bad_address;
chkprint(1);
deflines(lastln, lastln);
printf("%d\n", line1);
break;
case 'u':
if (nlines > 0)
goto bad_address;
chkprint(1);
if (udata.nr == 0)
error("nothing to undo");
undo();
break;
case 's':
deflines(curln, curln);
c = input();
compile(c);
getrhs(c);
num = getnth();
chkprint(1);
subst(num);
break;
case 'i':
if (nlines > 1)
goto bad_address;
chkprint(1);
deflines(curln, curln);
if (!line1)
goto bad_address;
append(prevln(line1));
break;
case 'a':
if (nlines > 1)
goto bad_address;
chkprint(1);
deflines(curln, curln);
append(line1);
break;
case 'm':
deflines(curln, curln);
if (!address(&line3))
line3 = curln;
chkprint(1);
move(line3);
break;
case 't':
deflines(curln, curln);
if (!address(&line3))
line3 = curln;
chkprint(1);
copy(line3);
break;
case 'c':
chkprint(1);
deflines(curln, curln);
delete(line1, line2);
append(prevln(line1));
break;
case 'j':
chkprint(1);
deflines(curln, curln+1);
if (!line1)
goto bad_address;
join();
break;
case 'z':
if (nlines > 1)
goto bad_address;
if (isdigit(back(input())))
num = getnum();
else
num = 24;
chkprint(1);
scroll(num);
break;
case 'k':
if (nlines > 1)
goto bad_address;
if (!islower(c = input()))
error("invalid mark character");
chkprint(1);
deflines(curln, curln);
marks[c] = line1;
break;
case 'P':
if (nlines > 0)
goto unexpected;
chkprint(1);
optprompt ^= 1;
break;
case 'Q':
modflag = 0;
case 'q':
if (nlines > 0)
goto unexpected;
if (modflag)
goto modified;
quit();
break;
case 'f':
if (nlines > 0)
goto unexpected;
if (!strcmp(s = getfname(), savfname))
puts(savfname);
else
strcpy(savfname, s);
break;
case 'E':
modflag = 0;
case 'e':
if (nlines > 0)
goto unexpected;
if (modflag)
goto modified;
strcpy(savfname, getfname());
setscratch();
deflines(curln, curln);
doread(savfname);
clearundo();
break;
default:
error("unknown command");
bad_address:
error("invalid address");
modified:
modflag = 0;
error("warning: file modified");
unexpected:
error("unexpected address");
}
if (!pflag)
goto save_last_cmd;
line1 = line2 = curln;
print:
doprint();
save_last_cmd:
if (!uflag)
repidx = 0;
if (rep)
return;
free(ocmdline);
cmdline = addchar('\0', cmdline, &cmdcap, &cmdsiz);
if ((ocmdline = strdup(cmdline)) == NULL)
error("out of memory");
}
static int
chkglobal(void)
{
int delim, c, dir, i, v;
uflag = 1;
gflag = 0;
skipblank();
switch (c = input()) {
case 'g':
uflag = 0;
case 'G':
dir = 1;
break;
case 'v':
uflag = 0;
case 'V':
dir = 0;
break;
default:
back(c);
return 0;
}
gflag = 1;
deflines(nextln(0), lastln);
delim = input();
compile(delim);
for (i = 1; i <= lastln; ++i) {
if (i >= line1 && i <= line2)
v = match(i) == dir;
else
v = 0;
setglobal(i, v);
}
return 1;
}
static void
doglobal(void)
{
int i, k;
skipblank();
cmdsiz = 0;
gflag = 1;
if (uflag)
chkprint(0);
for (i = 1; i <= lastln; i++) {
k = getindex(i);
if (!zero[k].global)
continue;
curln = i;
nlines = 0;
if (uflag) {
line1 = line2 = i;
pflag = 0;
doprint();
}
docmd();
}
discard(); /* cover the case of not matching anything */
}
static void
usage(void)
{
eprintf("usage: %s [-s] [-p] [file]\n", argv0);
}
static void
sigintr(int n)
{
signal(SIGINT, sigintr);
error("interrupt");
}
static void
sighup(int dummy)
{
int n;
char *home = getenv("HOME"), fname[FILENAME_MAX];
if (modflag) {
line1 = nextln(0);
line2 = lastln;
if (!setjmp(savesp)) {
dowrite("ed.hup", 1);
} else if (home && !setjmp(savesp)) {
n = snprintf(fname,
sizeof(fname), "%s/%s", home, "ed.hup");
if (n < sizeof(fname) && n > 0)
dowrite(fname, 1);
}
}
exstatus = 1;
quit();
}
static void
edit(void)
{
setjmp(savesp);
for (;;) {
newcmd = 1;
ocurln = curln;
cmdsiz = 0;
repidx = -1;
if (optprompt)
fputs(prompt, stdout);
getlst();
chkglobal() ? doglobal() : docmd();
}
}
int
main(int argc, char *argv[])
{
ARGBEGIN {
case 'p':
prompt = EARGF(usage());
optprompt = 1;
break;
case 's':
optdiag = 0;
break;
default:
usage();
} ARGEND
if (argc > 1)
usage();
signal(SIGINT, sigintr);
signal(SIGHUP, sighup);
signal(SIGQUIT, SIG_IGN);
if (!setjmp(savesp)) {
setscratch();
if (*argv) {
if (strlen(*argv) >= FILENAME_MAX)
error("file name too long");
doread(*argv);
}
}
edit();
/* not reached */
return 0;
}
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