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The start of KNF + -Wall.  The code has been run through indent but
needs hand fixup.  I stopped at keymap.c...

/*
 *		Search commands.
 * The functions in this file implement the
 * search commands (both plain and incremental searches
 * are supported) and the query-replace command.
 *
 * The plain old search code is part of the original
 * MicroEMACS "distribution". The incremental search code,
 * and the query-replace code, is by Rich Ellison.
 */
#include	"def.h"
#ifndef NO_MACRO
#include	"macro.h"
#endif

#define SRCH_BEGIN	(0)	/* Search sub-codes.	 */
#define SRCH_FORW	(-1)
#define SRCH_BACK	(-2)
#define SRCH_NOPR	(-3)
#define SRCH_ACCM	(-4)
#define SRCH_MARK	(-5)

typedef struct {
	int             s_code;
	LINE           *s_dotp;
	int             s_doto;
}               SRCHCOM;

static SRCHCOM  cmds[NSRCH];
static int      cip;

int             srch_lastdir = SRCH_NOPR;	/* Last search flags.	 */

static VOID     is_cpush();
static VOID     is_lpush();
static VOID     is_pop();
static int      is_peek();
static VOID     is_undo();
static int      is_find();
static VOID     is_prompt();
static VOID     is_dspl();
static int      eq();

/*
 * Search forward.
 * Get a search string from the user, and search for it,
 * starting at ".". If found, "." gets moved to just after the
 * matched characters, and display does all the hard stuff.
 * If not found, it just prints a message.
 */
/* ARGSUSED */
forwsearch(f, n)
{
	register int    s;

	if ((s = readpattern("Search")) != TRUE)
		return s;
	if (forwsrch() == FALSE) {
		ewprintf("Search failed: \"%s\"", pat);
		return FALSE;
	}
	srch_lastdir = SRCH_FORW;
	return TRUE;
}

/*
 * Reverse search.
 * Get a search string from the	 user, and search, starting at "."
 * and proceeding toward the front of the buffer. If found "." is left
 * pointing at the first character of the pattern [the last character that
 * was matched].
 */
/* ARGSUSED */
backsearch(f, n)
{
	register int    s;

	if ((s = readpattern("Search backward")) != TRUE)
		return (s);
	if (backsrch() == FALSE) {
		ewprintf("Search failed: \"%s\"", pat);
		return FALSE;
	}
	srch_lastdir = SRCH_BACK;
	return TRUE;
}

/*
 * Search again, using the same search string
 * and direction as the last search command. The direction
 * has been saved in "srch_lastdir", so you know which way
 * to go.
 */
/* ARGSUSED */
searchagain(f, n)
{
	if (srch_lastdir == SRCH_FORW) {
		if (forwsrch() == FALSE) {
			ewprintf("Search failed: \"%s\"", pat);
			return FALSE;
		}
		return TRUE;
	}
	if (srch_lastdir == SRCH_BACK) {
		if (backsrch() == FALSE) {
			ewprintf("Search failed: \"%s\"", pat);
			return FALSE;
		}
		return TRUE;
	}
	ewprintf("No last search");
	return FALSE;
}

/*
 * Use incremental searching, initially in the forward direction.
 * isearch ignores any explicit arguments.
 */
/* ARGSUSED */
forwisearch(f, n)
{
	return isearch(SRCH_FORW);
}

/*
 * Use incremental searching, initially in the reverse direction.
 * isearch ignores any explicit arguments.
 */
/* ARGSUSED */
backisearch(f, n)
{
	return isearch(SRCH_BACK);
}

/*
 * Incremental Search.
 *	dir is used as the initial direction to search.
 *	^S	switch direction to forward
 *	^R	switch direction to reverse
 *	^Q	quote next character (allows searching for ^N etc.)
 *	<ESC>	exit from Isearch
 *	<DEL>	undoes last character typed. (tricky job to do this correctly).
 *	other ^ exit search, don't set mark
 *	else	accumulate into search string
 */
isearch(dir)
{
	register int    c;
	register LINE  *clp;
	register int    cbo;
	register int    success;
	int             pptr;
	char            opat[NPAT];
	VOID            ungetkey();

#ifndef NO_MACRO
	if (macrodef) {
		ewprintf("Can't isearch in macro");
		return FALSE;
	}
#endif
	for (cip = 0; cip < NSRCH; cip++)
		cmds[cip].s_code = SRCH_NOPR;
	(VOID) strcpy(opat, pat);
	cip = 0;
	pptr = -1;
	clp = curwp->w_dotp;
	cbo = curwp->w_doto;
	is_lpush();
	is_cpush(SRCH_BEGIN);
	success = TRUE;
	is_prompt(dir, TRUE, success);
	for (;;) {
		update();
		switch (c = getkey(FALSE)) {
		case CCHR('['):
			srch_lastdir = dir;
			curwp->w_markp = clp;
			curwp->w_marko = cbo;
			ewprintf("Mark set");
			return (TRUE);

		case CCHR('G'):
			if (success != TRUE) {
				while (is_peek() == SRCH_ACCM)
					is_undo(&pptr, &dir);
				success = TRUE;
				is_prompt(dir, pptr < 0, success);
				break;
			}
			curwp->w_dotp = clp;
			curwp->w_doto = cbo;
			curwp->w_flag |= WFMOVE;
			srch_lastdir = dir;
			(VOID) ctrlg(FFRAND, 0);
			(VOID) strcpy(pat, opat);
			return ABORT;

		case CCHR(']'):
		case CCHR('S'):
			if (dir == SRCH_BACK) {
				dir = SRCH_FORW;
				is_lpush();
				is_cpush(SRCH_FORW);
				success = TRUE;
			}
			if (success == FALSE && dir == SRCH_FORW)
				break;
			is_lpush();
			pptr = strlen(pat);
			(VOID) forwchar(FFRAND, 1);
			if (is_find(SRCH_FORW) != FALSE)
				is_cpush(SRCH_MARK);
			else {
				(VOID) backchar(FFRAND, 1);
				ttbeep();
				success = FALSE;
			}
			is_prompt(dir, pptr < 0, success);
			break;

		case CCHR('R'):
			if (dir == SRCH_FORW) {
				dir = SRCH_BACK;
				is_lpush();
				is_cpush(SRCH_BACK);
				success = TRUE;
			}
			if (success == FALSE && dir == SRCH_BACK)
				break;
			is_lpush();
			pptr = strlen(pat);
			(VOID) backchar(FFRAND, 1);
			if (is_find(SRCH_BACK) != FALSE)
				is_cpush(SRCH_MARK);
			else {
				(VOID) forwchar(FFRAND, 1);
				ttbeep();
				success = FALSE;
			}
			is_prompt(dir, pptr < 0, success);
			break;

		case CCHR('H'):
		case CCHR('?'):
			is_undo(&pptr, &dir);
			if (is_peek() != SRCH_ACCM)
				success = TRUE;
			is_prompt(dir, pptr < 0, success);
			break;

		case CCHR('\\'):
		case CCHR('Q'):
			c = (char) getkey(FALSE);
			goto addchar;
		case CCHR('M'):
			c = CCHR('J');
			goto addchar;

		default:
			if (ISCTRL(c)) {
				ungetkey(c);
				curwp->w_markp = clp;
				curwp->w_marko = cbo;
				ewprintf("Mark set");
				curwp->w_flag |= WFMOVE;
				return TRUE;
			}	/* and continue */
		case CCHR('I'):
		case CCHR('J'):
	addchar:
			if (pptr == -1)
				pptr = 0;
			if (pptr == 0)
				success = TRUE;
			pat[pptr++] = c;
			if (pptr == NPAT) {
				ewprintf("Pattern too long");
				return FALSE;
			}
			pat[pptr] = '\0';
			is_lpush();
			if (success != FALSE) {
				if (is_find(dir) != FALSE)
					is_cpush(c);
				else {
					success = FALSE;
					ttbeep();
					is_cpush(SRCH_ACCM);
				}
			} else
				is_cpush(SRCH_ACCM);
			is_prompt(dir, FALSE, success);
		}
	}
	/* NOTREACHED */
}

static          VOID
is_cpush(cmd)
	register int    cmd;
{
	if (++cip >= NSRCH)
		cip = 0;
	cmds[cip].s_code = cmd;
}

static          VOID
is_lpush()
{
	register int    ctp;

	ctp = cip + 1;
	if (ctp >= NSRCH)
		ctp = 0;
	cmds[ctp].s_code = SRCH_NOPR;
	cmds[ctp].s_doto = curwp->w_doto;
	cmds[ctp].s_dotp = curwp->w_dotp;
}

static          VOID
is_pop()
{
	if (cmds[cip].s_code != SRCH_NOPR) {
		curwp->w_doto = cmds[cip].s_doto;
		curwp->w_dotp = cmds[cip].s_dotp;
		curwp->w_flag |= WFMOVE;
		cmds[cip].s_code = SRCH_NOPR;
	}
	if (--cip <= 0)
		cip = NSRCH - 1;
}

static int
is_peek()
{
	return cmds[cip].s_code;
}

/* this used to always return TRUE (the return value was checked) */
static          VOID
is_undo(pptr, dir)
	register int   *pptr;
	register int   *dir;
{
	register int    redo = FALSE;
	switch (cmds[cip].s_code) {
	case SRCH_BEGIN:
	case SRCH_NOPR:
		*pptr = -1;
	case SRCH_MARK:
		break;

	case SRCH_FORW:
		*dir = SRCH_BACK;
		redo = TRUE;
		break;

	case SRCH_BACK:
		*dir = SRCH_FORW;
		redo = TRUE;
		break;

	case SRCH_ACCM:
	default:
		*pptr -= 1;
		if (*pptr < 0)
			*pptr = 0;
		pat[*pptr] = '\0';
		break;
	}
	is_pop();
	if (redo)
		is_undo(pptr, dir);
}

static int
is_find(dir)
	register int    dir;
{
	register int    plen, odoto;
	register LINE  *odotp;

	odoto = curwp->w_doto;
	odotp = curwp->w_dotp;
	plen = strlen(pat);
	if (plen != 0) {
		if (dir == SRCH_FORW) {
			(VOID) backchar(FFARG | FFRAND, plen);
			if (forwsrch() == FALSE) {
				curwp->w_doto = odoto;
				curwp->w_dotp = odotp;
				return FALSE;
			}
			return TRUE;
		}
		if (dir == SRCH_BACK) {
			(VOID) forwchar(FFARG | FFRAND, plen);
			if (backsrch() == FALSE) {
				curwp->w_doto = odoto;
				curwp->w_dotp = odotp;
				return FALSE;
			}
			return TRUE;
		}
		ewprintf("bad call to is_find");
		return FALSE;
	}
	return FALSE;
}

/*
 * If called with "dir" not one of SRCH_FORW
 * or SRCH_BACK, this routine used to print an error
 * message. It also used to return TRUE or FALSE,
 * depending on if it liked the "dir". However, none
 * of the callers looked at the status, so I just
 * made the checking vanish.
 */
static          VOID
is_prompt(dir, flag, success)
{
	if (dir == SRCH_FORW) {
		if (success != FALSE)
			is_dspl("I-search", flag);
		else
			is_dspl("Failing I-search", flag);
	} else if (dir == SRCH_BACK) {
		if (success != FALSE)
			is_dspl("I-search backward", flag);
		else
			is_dspl("Failing I-search backward", flag);
	} else
		ewprintf("Broken call to is_prompt");
}

/*
 * Prompt writing routine for the incremental search.
 * The "prompt" is just a string. The "flag" determines
 * whether pat should be printed.
 */
static          VOID
is_dspl(prompt, flag)
	char           *prompt;
{

	if (flag != FALSE)
		ewprintf("%s: ", prompt);
	else
		ewprintf("%s: %s", prompt, pat);
}

/*
 * Query Replace.
 *	Replace strings selectively.  Does a search and replace operation.
 */
/* ARGSUSED */
queryrepl(f, n)
{
	register int    s;
	register int    rcnt = 0;	/* Replacements made so far	 */
	register int    plen;	/* length of found string	 */
	char            news[NPAT];	/* replacement string		 */

#ifndef NO_MACRO
	if (macrodef) {
		ewprintf("Can't query replace in macro");
		return FALSE;
	}
#endif
	if ((s = readpattern("Query replace")) != TRUE)
		return (s);
	if ((s = ereply("Query replace %s with: ", news, NPAT, pat)) == ABORT)
		return (s);
	if (s == FALSE)
		news[0] = '\0';
	ewprintf("Query replacing %s with %s:", pat, news);
	plen = strlen(pat);

	/*
	 * Search forward repeatedly, checking each time whether to insert
	 * or not.  The "!" case makes the check always true, so it gets put
	 * into a tighter loop for efficiency.
	 */

	while (forwsrch() == TRUE) {
retry:
		update();
		switch (getkey(FALSE)) {
		case ' ':
			if (lreplace((RSIZE) plen, news, f) == FALSE)
				return (FALSE);
			rcnt++;
			break;

		case '.':
			if (lreplace((RSIZE) plen, news, f) == FALSE)
				return (FALSE);
			rcnt++;
			goto stopsearch;

		case CCHR('G'):/* ^G or ESC */
			(VOID) ctrlg(FFRAND, 0);
		case CCHR('['):
			goto stopsearch;

		case '!':
			do {
				if (lreplace((RSIZE) plen, news, f) == FALSE)
					return (FALSE);
				rcnt++;
			} while (forwsrch() == TRUE);
			goto stopsearch;

		case CCHR('H'):
		case CCHR('?'):/* To not replace */
			break;

		default:
			ewprintf("<SP> replace, [.] rep-end, <DEL> don't, [!] repl rest <ESC> quit");
			goto retry;
		}
	}
stopsearch:
	curwp->w_flag |= WFHARD;
	update();
	if (rcnt == 0)
		ewprintf("(No replacements done)");
	else if (rcnt == 1)
		ewprintf("(1 replacement done)");
	else
		ewprintf("(%d replacements done)", rcnt);
	return TRUE;
}

/*
 * This routine does the real work of a
 * forward search. The pattern is sitting in the external
 * variable "pat". If found, dot is updated, the window system
 * is notified of the change, and TRUE is returned. If the
 * string isn't found, FALSE is returned.
 */
forwsrch()
{
	register LINE  *clp;
	register int    cbo;
	register LINE  *tlp;
	register int    tbo;
	char           *pp;
	register int    c;

	clp = curwp->w_dotp;
	cbo = curwp->w_doto;
	for (;;) {
		if (cbo == llength(clp)) {
			if ((clp = lforw(clp)) == curbp->b_linep)
				break;
			cbo = 0;
			c = CCHR('J');
		} else
			c = lgetc(clp, cbo++);
		if (eq(c, pat[0]) != FALSE) {
			tlp = clp;
			tbo = cbo;
			pp = &pat[1];
			while (*pp != 0) {
				if (tbo == llength(tlp)) {
					tlp = lforw(tlp);
					if (tlp == curbp->b_linep)
						goto fail;
					tbo = 0;
					c = CCHR('J');
				} else
					c = lgetc(tlp, tbo++);
				if (eq(c, *pp++) == FALSE)
					goto fail;
			}
			curwp->w_dotp = tlp;
			curwp->w_doto = tbo;
			curwp->w_flag |= WFMOVE;
			return TRUE;
		}
fail:		;
	}
	return FALSE;
}

/*
 * This routine does the real work of a
 * backward search. The pattern is sitting in the external
 * variable "pat". If found, dot is updated, the window system
 * is notified of the change, and TRUE is returned. If the
 * string isn't found, FALSE is returned.
 */
backsrch()
{
	register LINE  *clp;
	register int    cbo;
	register LINE  *tlp;
	register int    tbo;
	register int    c;
	register char  *epp;
	register char  *pp;

	for (epp = &pat[0]; epp[1] != 0; ++epp);
	clp = curwp->w_dotp;
	cbo = curwp->w_doto;
	for (;;) {
		if (cbo == 0) {
			clp = lback(clp);
			if (clp == curbp->b_linep)
				return FALSE;
			cbo = llength(clp) + 1;
		}
		if (--cbo == llength(clp))
			c = CCHR('J');
		else
			c = lgetc(clp, cbo);
		if (eq(c, *epp) != FALSE) {
			tlp = clp;
			tbo = cbo;
			pp = epp;
			while (pp != &pat[0]) {
				if (tbo == 0) {
					tlp = lback(tlp);
					if (tlp == curbp->b_linep)
						goto fail;
					tbo = llength(tlp) + 1;
				}
				if (--tbo == llength(tlp))
					c = CCHR('J');
				else
					c = lgetc(tlp, tbo);
				if (eq(c, *--pp) == FALSE)
					goto fail;
			}
			curwp->w_dotp = tlp;
			curwp->w_doto = tbo;
			curwp->w_flag |= WFMOVE;
			return TRUE;
		}
fail:		;
	}
	/* NOTREACHED */
}

/*
 * Compare two characters.
 * The "bc" comes from the buffer.
 * It has its case folded out. The
 * "pc" is from the pattern.
 */
static int
eq(bc, pc)
	register int    bc, pc;
{
	bc = CHARMASK(bc);
	pc = CHARMASK(pc);
	if (bc == pc)
		return TRUE;
	if (ISUPPER(bc))
		return TOLOWER(bc) == pc;
	if (ISUPPER(pc))
		return bc == TOLOWER(pc);
	return FALSE;
}

/*
 * Read a pattern.
 * Stash it in the external variable "pat". The "pat" is
 * not updated if the user types in an empty line. If the user typed
 * an empty line, and there is no old pattern, it is an error.
 * Display the old pattern, in the style of Jeff Lomicka. There is
 * some do-it-yourself control expansion.
 */
readpattern(prompt)
	char           *prompt;
{
	register int    s;
	char            tpat[NPAT];

	if (tpat[0] == '\0')
		s = ereply("%s: ", tpat, NPAT, prompt);
	else
		s = ereply("%s: (default %s) ", tpat, NPAT, prompt, pat);

	if (s == TRUE)		/* Specified		 */
		(VOID) strcpy(pat, tpat);
	else if (s == FALSE && pat[0] != 0)	/* CR, but old one	 */
		s = TRUE;
	return s;
}