search.c

早期freebsd实现

	*el->el_line.lastchar = '\0';

	if (!done) {

	    /* Can't search if unmatched '[' */
	    for (cp = &el->el_search.patbuf[el->el_search.patlen-1], ch = ']'; 
		 cp > el->el_search.patbuf; cp--)
		if (*cp == '[' || *cp == ']') {
		    ch = *cp;
		    break;
		}

	    if (el->el_search.patlen > 1 && ch != '[') {
		if (redo && newdir == dir) {
		    if (pchar == '?') {	/* wrap around */
			el->el_history.eventno = 
			    newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
			if (hist_get(el) == CC_ERROR)
			    /* el->el_history.eventno was fixed by first call */
			    (void) hist_get(el);
			el->el_line.cursor = newdir == ED_SEARCH_PREV_HISTORY ?
			    el->el_line.lastchar : el->el_line.buffer;
		    } else
			el->el_line.cursor += 
				newdir == ED_SEARCH_PREV_HISTORY ? -1 : 1;
		}
#ifdef ANCHOR
		el->el_search.patbuf[el->el_search.patlen++] = '.';
		el->el_search.patbuf[el->el_search.patlen++] = '*';
#endif
		el->el_search.patbuf[el->el_search.patlen] = '\0';
		if (el->el_line.cursor < el->el_line.buffer || 
		    el->el_line.cursor > el->el_line.lastchar ||
		    (ret = ce_search_line(el, &el->el_search.patbuf[1], 
					  newdir)) == CC_ERROR) {
		    /* avoid c_setpat */
		    el->el_state.lastcmd = (el_action_t) newdir; 
		    ret = newdir == ED_SEARCH_PREV_HISTORY ?
			ed_search_prev_history(el, 0) : 
			ed_search_next_history(el, 0);
		    if (ret != CC_ERROR) {
			el->el_line.cursor = newdir == ED_SEARCH_PREV_HISTORY ?
			    el->el_line.lastchar : el->el_line.buffer;
			(void) ce_search_line(el, &el->el_search.patbuf[1], 
					      newdir);
		    }
		}
		el->el_search.patbuf[--el->el_search.patlen] = '\0';
		if (ret == CC_ERROR) {
		    term_beep(el);
		    if (el->el_history.eventno != ohisteventno) {
			el->el_history.eventno = ohisteventno;
			if (hist_get(el) == CC_ERROR)
			    return CC_ERROR;
		    }
		    el->el_line.cursor = ocursor;
		    pchar = '?';
		} else {
		    pchar = ':';
		}
	    }

	    ret = ce_inc_search(el, newdir);

	    if (ret == CC_ERROR && pchar == '?' && oldpchar == ':') 
		/* break abort of failed search at last non-failed */
		ret = CC_NORM;

	}

	if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
	    /* restore on normal return or error exit */
	    pchar = oldpchar;
	    el->el_search.patlen = oldpatlen;
	    if (el->el_history.eventno != ohisteventno) {
		el->el_history.eventno = ohisteventno;
		if (hist_get(el) == CC_ERROR)
		    return CC_ERROR;
	    }
	    el->el_line.cursor = ocursor;
	    if (ret == CC_ERROR)
		re_refresh(el);
	}
	if (done || ret != CC_NORM)
	    return ret;
    }
}


/* cv_search():
 *	Vi search.
 */
protected el_action_t
cv_search(el, dir)
    EditLine *el;
    int dir;
{
    char ch;
    char tmpbuf[EL_BUFSIZ];
    int tmplen;

    tmplen = 0;
#ifdef ANCHOR
    tmpbuf[tmplen++] = '.';
    tmpbuf[tmplen++] = '*';
#endif

    el->el_line.buffer[0] = '\0';
    el->el_line.lastchar = el->el_line.buffer;
    el->el_line.cursor = el->el_line.buffer;
    el->el_search.patdir = dir;

    c_insert(el, 2);	/* prompt + '\n' */
    *el->el_line.cursor++ = '\n';
    *el->el_line.cursor++ = dir == ED_SEARCH_PREV_HISTORY ? '/' : '?';
    re_refresh(el);

#ifdef ANCHOR
# define LEN 2
#else
# define LEN 0
#endif

    tmplen = c_gets(el, &tmpbuf[LEN]) + LEN;
    ch = tmpbuf[tmplen];
    tmpbuf[tmplen] = '\0';

    if (tmplen == LEN) {
	/*
	 * Use the old pattern, but wild-card it.
	 */
	if (el->el_search.patlen == 0) {
	    el->el_line.buffer[0] = '\0';
	    el->el_line.lastchar = el->el_line.buffer;
	    el->el_line.cursor = el->el_line.buffer;
	    re_refresh(el);
	    return CC_ERROR;
	}
#ifdef ANCHOR
	if (el->el_search.patbuf[0] != '.' && el->el_search.patbuf[0] != '*') {
	    (void) strcpy(tmpbuf, el->el_search.patbuf);
	    el->el_search.patbuf[0] = '.';
	    el->el_search.patbuf[1] = '*';
	    (void) strcpy(&el->el_search.patbuf[2], tmpbuf);
	    el->el_search.patlen++;
	    el->el_search.patbuf[el->el_search.patlen++] = '.';
	    el->el_search.patbuf[el->el_search.patlen++] = '*';
	    el->el_search.patbuf[el->el_search.patlen] = '\0';
	}
#endif
    }
    else {
#ifdef ANCHOR
	tmpbuf[tmplen++] = '.';
	tmpbuf[tmplen++] = '*';
#endif
	tmpbuf[tmplen] = '\0';
	(void) strcpy(el->el_search.patbuf, tmpbuf);
	el->el_search.patlen = tmplen;
    }
    el->el_state.lastcmd = (el_action_t) dir; /* avoid c_setpat */
    el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
    if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) : 
			        ed_search_next_history(el, 0)) == CC_ERROR) {
	re_refresh(el);
	return CC_ERROR;
    }
    else {
	if (ch == 0033) {
	    re_refresh(el);
	    *el->el_line.lastchar++ = '\n';
	    *el->el_line.lastchar = '\0';
	    re_goto_bottom(el);
	    return CC_NEWLINE;
	}
	else
	    return CC_REFRESH;
    }
}


/* ce_search_line():
 *	Look for a pattern inside a line
 */
protected el_action_t
ce_search_line(el, pattern, dir)
    EditLine *el;
    char *pattern;
    int dir;
{
    char *cp;

    if (dir == ED_SEARCH_PREV_HISTORY) {
	for (cp = el->el_line.cursor; cp >= el->el_line.buffer; cp--)
	    if (el_match(cp, pattern)) {
		el->el_line.cursor = cp;
		return CC_NORM;
	    }
	return CC_ERROR;
    } else {
	for (cp = el->el_line.cursor; *cp != '\0' && 
	     cp < el->el_line.limit; cp++)
	    if (el_match(cp, pattern)) {
		el->el_line.cursor = cp;
		return CC_NORM;
	    }
	return CC_ERROR;
    }
}


/* cv_repeat_srch():
 *	Vi repeat search
 */
protected el_action_t
cv_repeat_srch(el, c)
    EditLine *el;
    int c;
{
#ifdef SDEBUG
    (void) fprintf(el->el_errfile, "dir %d patlen %d patbuf %s\n", 
		   c, el->el_search.patlen, el->el_search.patbuf);
#endif

    el->el_state.lastcmd = (el_action_t) c;  /* Hack to stop c_setpat */
    el->el_line.lastchar = el->el_line.buffer;

    switch (c) {
    case ED_SEARCH_NEXT_HISTORY:
	return ed_search_next_history(el, 0);
    case ED_SEARCH_PREV_HISTORY:
	return ed_search_prev_history(el, 0);
    default:
	return CC_ERROR;
    }
}


/* cv_csearch_back():
 *	Vi character search reverse
 */
protected el_action_t
cv_csearch_back(el, ch, count, tflag)
    EditLine *el;
    int ch, count, tflag;
{
    char *cp;

    cp = el->el_line.cursor;
    while (count--) {
	if (*cp == ch) 
	    cp--;
	while (cp > el->el_line.buffer && *cp != ch) 
	    cp--;
    }

    if (cp < el->el_line.buffer || (cp == el->el_line.buffer && *cp != ch))
	return CC_ERROR;

    if (*cp == ch && tflag)
	cp++;

    el->el_line.cursor = cp;

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }

    re_refresh_cursor(el);
    return CC_NORM;
}


/* cv_csearch_fwd():
 *	Vi character search forward
 */
protected el_action_t
cv_csearch_fwd(el, ch, count, tflag)
    EditLine *el;
    int ch, count, tflag;
{
    char *cp;

    cp = el->el_line.cursor;
    while (count--) {
	if(*cp == ch) 
	    cp++;
	while (cp < el->el_line.lastchar && *cp != ch) 
	    cp++;
    }

    if (cp >= el->el_line.lastchar)
	return CC_ERROR;

    if (*cp == ch && tflag)
	cp--;

    el->el_line.cursor = cp;

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }
    re_refresh_cursor(el);
    return CC_NORM;
}