usr/src/cmd/ex/ex_subr.c

/* Copyright (c) 1980 Regents of the University of California */
static char *sccsid = "@(#)ex_subr.c    6.2 11/6/80";
#include "ex.h"
#include "ex_re.h"
#include "ex_tty.h"
#include "ex_vis.h"

/*
 * Random routines, in alphabetical order.
 */

any(c, s)
        int c;
        register char *s;
{
        register int x;

        while (x = *s++)
                if (x == c)
                        return (1);
        return (0);
}

backtab(i)
        register int i;
{
        register int j;

        j = i % value(SHIFTWIDTH);
        if (j == 0)
                j = value(SHIFTWIDTH);
        i -= j;
        if (i < 0)
                i = 0;
        return (i);
}

change()
{

        tchng++;
        chng = tchng;
}

/*
 * Column returns the number of
 * columns occupied by printing the
 * characters through position cp of the
 * current line.
 */
column(cp)
        register char *cp;
{

        if (cp == 0)
                cp = &linebuf[LBSIZE - 2];
        return (qcolumn(cp, (char *) 0));
}

/*
 * Ignore a comment to the end of the line.
 * This routine eats the trailing newline so don't call newline().
 */
comment()
{
        register int c;

        do {
                c = getchar();
        } while (c != '\n' && c != EOF);
        if (c == EOF)
                ungetchar(c);
}

Copy(to, from, size)
        register char *from, *to;
        register int size;
{

        if (size > 0)
                do
                        *to++ = *from++;
                while (--size > 0);
}

copyw(to, from, size)
        register line *from, *to;
        register int size;
{

        if (size > 0)
                do
                        *to++ = *from++;
                while (--size > 0);
}

copywR(to, from, size)
        register line *from, *to;
        register int size;
{

        while (--size >= 0)
                to[size] = from[size];
}

ctlof(c)
        int c;
{

        return (c == TRIM ? '?' : c | ('A' - 1));
}

dingdong()
{

        if (VB)
                putpad(VB);
        else if (value(ERRORBELLS))
                putch('\207');
}

fixindent(indent)
        int indent;
{
        register int i;
        register char *cp;

        i = whitecnt(genbuf);
        cp = vpastwh(genbuf);
        if (*cp == 0 && i == indent && linebuf[0] == 0) {
                genbuf[0] = 0;
                return (i);
        }
        CP(genindent(i), cp);
        return (i);
}

filioerr(cp)
        char *cp;
{
        register int oerrno = errno;

        lprintf("\"%s\"", cp);
        errno = oerrno;
        syserror();
}

char *
genindent(indent)
        register int indent;
{
        register char *cp;

        for (cp = genbuf; indent >= value(TABSTOP); indent -= value(TABSTOP))
                *cp++ = '\t';
        for (; indent > 0; indent--)
                *cp++ = ' ';
        return (cp);
}

getDOT()
{

        getline(*dot);
}

line *
getmark(c)
        register int c;
{
        register line *addr;

        for (addr = one; addr <= dol; addr++)
                if (names[c - 'a'] == (*addr &~ 01)) {
                        return (addr);
                }
        return (0);
}

getn(cp)
        register char *cp;
{
        register int i = 0;

        while (isdigit(*cp))
                i = i * 10 + *cp++ - '0';
        if (*cp)
                return (0);
        return (i);
}

ignnEOF()
{
        register int c = getchar();

        if (c == EOF)
                ungetchar(c);
        else if (c=='"')
                comment();
}

iswhite(c)
        int c;
{

        return (c == ' ' || c == '\t');
}

junk(c)
        register int c;
{

        if (c && !value(BEAUTIFY))
                return (0);
        if (c >= ' ' && c != TRIM)
                return (0);
        switch (c) {

        case '\t':
        case '\n':
        case '\f':
                return (0);

        default:
                return (1);
        }
}

killed()
{

        killcnt(addr2 - addr1 + 1);
}

killcnt(cnt)
        register int cnt;
{

        if (inopen) {
                notecnt = cnt;
                notenam = notesgn = "";
                return;
        }
        if (!notable(cnt))
                return;
        printf("%d lines", cnt);
        if (value(TERSE) == 0) {
                printf(" %c%s", Command[0] | ' ', Command + 1);
                if (Command[strlen(Command) - 1] != 'e')
                        putchar('e');
                putchar('d');
        }
        putNFL();
}

lineno(a)
        line *a;
{

        return (a - zero);
}

lineDOL()
{

        return (lineno(dol));
}

lineDOT()
{

        return (lineno(dot));
}

markDOT()
{

        markpr(dot);
}

markpr(which)
        line *which;
{

        if ((inglobal == 0 || inopen) && which <= endcore) {
                names['z'-'a'+1] = *which & ~01;
                if (inopen)
                        ncols['z'-'a'+1] = cursor;
        }
}

markreg(c)
        register int c;
{

        if (c == '\'' || c == '`')
                return ('z' + 1);
        if (c >= 'a' && c <= 'z')
                return (c);
        return (0);
}

/*
 * Mesg decodes the terse/verbose strings. Thus
 *      'xxx@yyy' -> 'xxx' if terse, else 'xxx yyy'
 *      'xxx|yyy' -> 'xxx' if terse, else 'yyy'
 * All others map to themselves.
 */
char *
mesg(str)
        register char *str;
{
        register char *cp;

        str = strcpy(genbuf, str);
        for (cp = str; *cp; cp++)
                switch (*cp) {

                case '@':
                        if (value(TERSE))
                                *cp = 0;
                        else
                                *cp = ' ';
                        break;

                case '|':
                        if (value(TERSE) == 0)
                                return (cp + 1);
                        *cp = 0;
                        break;
                }
        return (str);
}

/*VARARGS2*/
merror(seekpt, i)
#ifdef VMUNIX
        char *seekpt;
#else
# ifdef lint
        char *seekpt;
# else
        int seekpt;
# endif
#endif
        int i;
{
        register char *cp = linebuf;

        if (seekpt == 0)
                return;
        merror1(seekpt);
        if (*cp == '\n')
                putnl(), cp++;
        if (inopen && CE)
                vclreol();
        if (SO && SE)
                putpad(SO);
        printf(mesg(cp), i);
        if (SO && SE)
                putpad(SE);
}

merror1(seekpt)
#ifdef VMUNIX
        char *seekpt;
#else
# ifdef lint
        char *seekpt;
# else
        int seekpt;
# endif
#endif
{

#ifdef VMUNIX
        strcpy(linebuf, seekpt);
#else
        lseek(erfile, (long) seekpt, 0);
        if (read(erfile, linebuf, 128) < 2)
                CP(linebuf, "ERROR");
#endif
}

morelines()
{

        if ((int) sbrk(1024 * sizeof (line)) == -1)
                return (-1);
        endcore += 1024;
        return (0);
}

nonzero()
{

        if (addr1 == zero) {
                notempty();
                error("Nonzero address required@on this command");
        }
}

notable(i)
        int i;
{

        return (hush == 0 && !inglobal && i > value(REPORT));
}


notempty()
{

        if (dol == zero)
                error("No lines@in the buffer");
}


netchHAD(cnt)
        int cnt;
{

        netchange(lineDOL() - cnt);
}

netchange(i)
        register int i;
{
        register char *cp;

        if (i > 0)
                notesgn = cp = "more ";
        else
                notesgn = cp = "fewer ", i = -i;
        if (inopen) {
                notecnt = i;
                notenam = "";
                return;
        }
        if (!notable(i))
                return;
        printf(mesg("%d %slines@in file after %s"), i, cp, Command);
        putNFL();
}

putmark(addr)
        line *addr;
{

        putmk1(addr, putline());
}

putmk1(addr, n)
        register line *addr;
        int n;
{
        register line *markp;
        register oldglobmk;

        oldglobmk = *addr & 1;
        *addr &= ~1;
        for (markp = (anymarks ? names : &names['z'-'a'+1]);
          markp <= &names['z'-'a'+1]; markp++)
                if (*markp == *addr)
                        *markp = n;
        *addr = n | oldglobmk;
}

char *
plural(i)
        long i;
{

        return (i == 1 ? "" : "s");
}

int     qcount();
short   vcntcol;

qcolumn(lim, gp)
        register char *lim, *gp;
{
        register int x;
        int (*OO)();

        OO = Outchar;
        Outchar = qcount;
        vcntcol = 0;
        if (lim != NULL)
                x = lim[1], lim[1] = 0;
        pline(0);
        if (lim != NULL)
                lim[1] = x;
        if (gp)
                while (*gp)
                        putchar(*gp++);
        Outchar = OO;
        return (vcntcol);
}

int
qcount(c)
        int c;
{

        if (c == '\t') {
                vcntcol += value(TABSTOP) - vcntcol % value(TABSTOP);
                return;
        }
        vcntcol++;
}

reverse(a1, a2)
        register line *a1, *a2;
{
        register line t;

        for (;;) {
                t = *--a2;
                if (a2 <= a1)
                        return;
                *a2 = *a1;
                *a1++ = t;
        }
}

save(a1, a2)
        line *a1;
        register line *a2;
{
        register int more;

        if (!FIXUNDO)
                return;
#ifdef TRACE
        if (trace)
                vudump("before save");
#endif
        undkind = UNDNONE;
        undadot = dot;
        more = (a2 - a1 + 1) - (unddol - dol);
        while (more > (endcore - truedol))
                if (morelines() < 0)
                        error("Out of memory@saving lines for undo - try using ed");
        if (more)
                (*(more > 0 ? copywR : copyw))(unddol + more + 1, unddol + 1,
                    (truedol - unddol));
        unddol += more;
        truedol += more;
        copyw(dol + 1, a1, a2 - a1 + 1);
        undkind = UNDALL;
        unddel = a1 - 1;
        undap1 = a1;
        undap2 = a2 + 1;
#ifdef TRACE
        if (trace)
                vudump("after save");
#endif
}

save12()
{

        save(addr1, addr2);
}

saveall()
{

        save(one, dol);
}

span()
{

        return (addr2 - addr1 + 1);
}

sync()
{

        chng = 0;
        tchng = 0;
        xchng = 0;
}


skipwh()
{
        register int wh;

        wh = 0;
        while (iswhite(peekchar())) {
                wh++;
                ignchar();
        }
        return (wh);
}

/*VARARGS2*/
smerror(seekpt, cp)
#ifdef lint
        char *seekpt;
#else
        int seekpt;
#endif
        char *cp;
{

        if (seekpt == 0)
                return;
        merror1(seekpt);
        if (inopen && CE)
                vclreol();
        if (SO && SE)
                putpad(SO);
        lprintf(mesg(linebuf), cp);
        if (SO && SE)
                putpad(SE);
}

#define std_nerrs (sizeof std_errlist / sizeof std_errlist[0])

#define error(i)        i

#ifdef lint
char    *std_errlist[] = {
#else
# ifdef VMUNIX
char    *std_errlist[] = {
# else
short   std_errlist[] = {
# endif
#endif
        error("Error 0"),
        error("Not super-user"),
        error("No such file or directory"),
        error("No such process"),
        error("Interrupted system call"),
        error("Physical I/O error"),
        error("No such device or address"),
        error("Argument list too long"),
        error("Exec format error"),
        error("Bad file number"),
        error("No children"),
        error("No more processes"),
        error("Not enough core"),
        error("Permission denied"),
        error("Bad address"),
        error("Block device required"),
        error("Mount device busy"),
        error("File exists"),
        error("Cross-device link"),
        error("No such device"),
        error("Not a directory"),
        error("Is a directory"),
        error("Invalid argument"),
        error("File table overflow"),
        error("Too many open files"),
        error("Not a typewriter"),
        error("Text file busy"),
        error("File too large"),
        error("No space left on device"),
        error("Illegal seek"),
        error("Read-only file system"),
        error("Too many links"),
        error("Broken pipe"),
#ifndef V6
        error("Math argument"),
        error("Result too large"),
#endif
        error("Quota exceeded")         /* Berkeley quota systems only */
};

#undef  error

char *
strend(cp)
        register char *cp;
{

        while (*cp)
                cp++;
        return (cp);
}

strcLIN(dp)
        char *dp;
{

        CP(linebuf, dp);
}

syserror()
{
        register int e = errno;

        dirtcnt = 0;
        putchar(' ');
        edited = 0;     /* for temp file errors, for example */
        if (e >= 0 && errno <= std_nerrs)
                error(std_errlist[e]);
        else
                error("System error %d", e);
}

/*
 * Return the column number that results from being in column col and
 * hitting a tab, where tabs are set every ts columns.  Work right for
 * the case where col > COLUMNS, even if ts does not divide COLUMNS.
 */
tabcol(col, ts)
int col, ts;
{
        int offset, result;

        if (col >= COLUMNS) {
                offset = COLUMNS * (col/COLUMNS);
                col -= offset;
        } else
                offset = 0;
        result = col + ts - (col % ts) + offset;
        return (result);
}

char *
vfindcol(i)
        int i;
{
        register char *cp;
        register int (*OO)() = Outchar;

        Outchar = qcount;
        ignore(qcolumn(linebuf - 1, NOSTR));
        for (cp = linebuf; *cp && vcntcol < i; cp++)
                putchar(*cp);
        if (cp != linebuf)
                cp--;
        Outchar = OO;
        return (cp);
}

char *
vskipwh(cp)
        register char *cp;
{

        while (iswhite(*cp) && cp[1])
                cp++;
        return (cp);
}


char *
vpastwh(cp)
        register char *cp;
{

        while (iswhite(*cp))
                cp++;
        return (cp);
}

whitecnt(cp)
        register char *cp;
{
        register int i;

        i = 0;
        for (;;)
                switch (*cp++) {

                case '\t':
                        i += value(TABSTOP) - i % value(TABSTOP);
                        break;

                case ' ':
                        i++;
                        break;

                default:
                        return (i);
                }
}

#ifdef lint
Ignore(a)
        char *a;
{

        a = a;
}

Ignorf(a)
        int (*a)();
{

        a = a;
}
#endif

markit(addr)
        line *addr;
{

        if (addr != dot && addr >= one && addr <= dol)
                markDOT();
}

/*
 * The following code is defensive programming against a bug in the
 * pdp-11 overlay implementation.  Sometimes it goes nuts and asks
 * for an overlay with some garbage number, which generates an emt
 * trap.  This is a less than elegant solution, but it is somewhat
 * better than core dumping and losing your work, leaving your tty
 * in a weird state, etc.
 */
int _ovno;
onemt()
{
        int oovno;

        signal(SIGEMT, onemt);
        oovno = _ovno;
        /* 2 and 3 are valid on 11/40 type vi, so */
        if (_ovno < 0 || _ovno > 3)
                _ovno = 0;
        error("emt trap, _ovno is %d @ - try again");
}