/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992 Diomidis Spinellis.
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Diomidis Spinellis of Imperial College, University of London.
 *
 * 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
static const char sccsid[] = "@(#)process.c	8.6 (Berkeley) 4/20/94";
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/uio.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>

#include "defs.h"
#include "extern.h"

static SPACE HS, PS, SS, YS;
#define	pd		PS.deleted
#define	ps		PS.space
#define	psl		PS.len
#define	psanl		PS.append_newline
#define	hs		HS.space
#define	hsl		HS.len

static inline int	 applies(struct s_command *);
static void		 do_tr(struct s_tr *);
static void		 flush_appends(void);
static void		 lputs(char *, size_t);
static int		 regexec_e(regex_t *, const char *, int, int, size_t,
			     size_t);
static void		 regsub(SPACE *, char *, char *);
static int		 substitute(struct s_command *);

struct s_appends *appends;	/* Array of pointers to strings to append. */
static unsigned int appendx;	/* Index into appends array. */
unsigned int appendnum;		/* Size of appends array. */

static int lastaddr;		/* Set by applies if last address of a range. */
static int sdone;		/* If any substitutes since last line input. */
				/* Iov structure for 'w' commands. */
static regex_t *defpreg;
size_t maxnsub;
regmatch_t *match;

#define OUT() do {							\
	fwrite(ps, 1, psl, outfile);					\
	if (psanl) fputc('\n', outfile);				\
} while (0)

void
process(void)
{
	struct s_command *cp;
	SPACE tspace;
	size_t oldpsl;
	char *p;
	int oldpsanl;

	p = NULL;
	oldpsanl = oldpsl = 0;

	for (linenum = 0; mf_fgets(&PS, REPLACE);) {
		pd = 0;
top:
		cp = prog;
redirect:
		while (cp != NULL) {
			if (!applies(cp)) {
				cp = cp->next;
				continue;
			}
			switch (cp->code) {
			case '{':
				cp = cp->u.c;
				goto redirect;
			case 'a':
				if (appendx >= appendnum)
					if ((appends = realloc(appends,
					    sizeof(struct s_appends) *
					    (appendnum *= 2))) == NULL)
						err(1, "realloc");
				appends[appendx].type = AP_STRING;
				appends[appendx].s = cp->t;
				appends[appendx].len = strlen(cp->t);
				appendx++;
				break;
			case 'b':
				cp = cp->u.c;
				goto redirect;
			case 'c':
				pd = 1;
				psl = 0;
				if (cp->a2 == NULL || lastaddr || lastline())
					(void)fprintf(outfile, "%s", cp->t);
				goto new;
			case 'd':
				pd = 1;
				goto new;
			case 'D':
				if (pd)
					goto new;
				if (psl == 0 ||
				    (p = memchr(ps, '\n', psl)) == NULL) {
					pd = 1;
					goto new;
				} else {
					psl -= (p + 1) - ps;
					memmove(ps, p + 1, psl);
					goto top;
				}
			case 'g':
				cspace(&PS, hs, hsl, REPLACE);
				break;
			case 'G':
				cspace(&PS, "\n", 1, APPEND);
				cspace(&PS, hs, hsl, APPEND);
				break;
			case 'h':
				cspace(&HS, ps, psl, REPLACE);
				break;
			case 'H':
				cspace(&HS, "\n", 1, APPEND);
				cspace(&HS, ps, psl, APPEND);
				break;
			case 'i':
				(void)fprintf(outfile, "%s", cp->t);
				break;
			case 'l':
				lputs(ps, psl);
				break;
			case 'n':
				if (!nflag && !pd)
					OUT();
				flush_appends();
				if (!mf_fgets(&PS, REPLACE))
					exit(0);
				pd = 0;
				break;
			case 'N':
				flush_appends();
				cspace(&PS, "\n", 1, APPEND);
				if (!mf_fgets(&PS, APPEND))
					exit(0);
				break;
			case 'p':
				if (pd)
					break;
				OUT();
				break;
			case 'P':
				if (pd)
					break;
				if ((p = memchr(ps, '\n', psl)) != NULL) {
					oldpsl = psl;
					oldpsanl = psanl;
					psl = p - ps;
					psanl = 1;
				}
				OUT();
				if (p != NULL) {
					psl = oldpsl;
					psanl = oldpsanl;
				}
				break;
			case 'q':
				if (inplace == NULL) {
					if (!nflag && !pd)
						OUT();
					flush_appends();
					exit(0);
				}
				quit = 1;
				break;
			case 'r':
				if (appendx >= appendnum)
					if ((appends = realloc(appends,
					    sizeof(struct s_appends) *
					    (appendnum *= 2))) == NULL)
						err(1, "realloc");
				appends[appendx].type = AP_FILE;
				appends[appendx].s = cp->t;
				appends[appendx].len = strlen(cp->t);
				appendx++;
				break;
			case 's':
				sdone |= substitute(cp);
				break;
			case 't':
				if (sdone) {
					sdone = 0;
					cp = cp->u.c;
					goto redirect;
				}
				break;
			case 'w':
				if (pd)
					break;
				if (cp->u.fd == -1 && (cp->u.fd = open(cp->t,
				    O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
				    DEFFILEMODE)) == -1)
					err(1, "%s", cp->t);
				if (write(cp->u.fd, ps, psl) != (ssize_t)psl ||
				    write(cp->u.fd, "\n", 1) != 1)
					err(1, "%s", cp->t);
				break;
			case 'x':
				/*
				 * If the hold space is null, make it empty
				 * but not null.  Otherwise the pattern space
				 * will become null after the swap, which is
				 * an abnormal condition.
				 */
				if (hs == NULL)
					cspace(&HS, "", 0, REPLACE);
				tspace = PS;
				PS = HS;
				psanl = tspace.append_newline;
				HS = tspace;
				break;
			case 'y':
				if (pd || psl == 0)
					break;
				do_tr(cp->u.y);
				break;
			case ':':
			case '}':
				break;
			case '=':
				(void)fprintf(outfile, "%lu\n", linenum);
			}
			cp = cp->next;
		} /* for all cp */

new:		if (!nflag && !pd)
			OUT();
		flush_appends();
	} /* for all lines */
}

/*
 * TRUE if the address passed matches the current program state
 * (lastline, linenumber, ps).
 */
#define	MATCH(a)							\
	((a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, 0, psl) :	\
	    (a)->type == AT_LINE ? linenum == (a)->u.l : lastline())

/*
 * Return TRUE if the command applies to the current line.  Sets the start
 * line for process ranges.  Interprets the non-select (``!'') flag.
 */
static inline int
applies(struct s_command *cp)
{
	int r;

	lastaddr = 0;
	if (cp->a1 == NULL && cp->a2 == NULL)
		r = 1;
	else if (cp->a2)
		if (cp->startline > 0) {
                        switch (cp->a2->type) {
                        case AT_RELLINE:
                                if (linenum - cp->startline <= cp->a2->u.l)
                                        r = 1;
                                else {
				        cp->startline = 0;
				        r = 0;
                                }
                                break;
                        default:
                                if (MATCH(cp->a2)) {
                                        cp->startline = 0;
                                        lastaddr = 1;
                                        r = 1;
                                } else if (cp->a2->type == AT_LINE &&
                                            linenum > cp->a2->u.l) {
                                        /*
                                         * We missed the 2nd address due to a
                                         * branch, so just close the range and
                                         * return false.
                                         */
                                        cp->startline = 0;
                                        r = 0;
                                } else
                                        r = 1;
                        }
		} else if (cp->a1 && MATCH(cp->a1)) {
			/*
			 * If the second address is a number less than or
			 * equal to the line number first selected, only
			 * one line shall be selected.
			 *	-- POSIX 1003.2
			 * Likewise if the relative second line address is zero.
			 */
			if ((cp->a2->type == AT_LINE &&
			    linenum >= cp->a2->u.l) ||
			    (cp->a2->type == AT_RELLINE && cp->a2->u.l == 0))
				lastaddr = 1;
			else {
				cp->startline = linenum;
			}
			r = 1;
		} else
			r = 0;
	else
		r = MATCH(cp->a1);
	return (cp->nonsel ? ! r : r);
}

/*
 * Reset the sed processor to its initial state.
 */
void
resetstate(void)
{
	struct s_command *cp;

	/*
	 * Reset all in-range markers.
	 */
	for (cp = prog; cp; cp = cp->code == '{' ? cp->u.c : cp->next)
		if (cp->a2)
			cp->startline = 0;

	/*
	 * Clear out the hold space.
	 */
	cspace(&HS, "", 0, REPLACE);
}

/*
 * substitute --
 *	Do substitutions in the pattern space.  Currently, we build a
 *	copy of the new pattern space in the substitute space structure
 *	and then swap them.
 */
static int
substitute(struct s_command *cp)
{
	SPACE tspace;
	regex_t *re;
	regoff_t slen;
	int lastempty, n;
	regoff_t le = 0;
	char *s;

	s = ps;
	re = cp->u.s->re;
	if (re == NULL) {
		if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) {
			linenum = cp->u.s->linenum;
			errx(1, "%lu: %s: \\%u not defined in the RE",
					linenum, fname, cp->u.s->maxbref);
		}
	}
	if (!regexec_e(re, ps, 0, 0, 0, psl))
		return (0);

	SS.len = 0;				/* Clean substitute space. */
	slen = psl;
	n = cp->u.s->n;
	lastempty = 1;

	do {
		/* Copy the leading retained string. */
		if (n <= 1 && (match[0].rm_so > le))
			cspace(&SS, s, match[0].rm_so - le, APPEND);

		/* Skip zero-length matches right after other matches. */
		if (lastempty || (match[0].rm_so - le) ||
		    match[0].rm_so != match[0].rm_eo) {
			if (n <= 1) {
				/* Want this match: append replacement. */
				regsub(&SS, ps, cp->u.s->new);
				if (n == 1)
					n = -1;
			} else {
				/* Want a later match: append original. */
				if (match[0].rm_eo - le)
					cspace(&SS, s, match[0].rm_eo - le,
					    APPEND);
				n--;
			}
		}

		/* Move past this match. */
		s = ps + match[0].rm_eo;
		slen = psl - match[0].rm_eo;
		le = match[0].rm_eo;

		/*
		 * After a zero-length match, advance one byte,
		 * and at the end of the line, terminate.
		 */
		if (match[0].rm_so == match[0].rm_eo) {
			if (slen > 0) {
			 	cspace(&SS, s++, 1, APPEND);
				slen--;
				le++;
			} else
				slen = -1;
			lastempty = 1;
		} else
			lastempty = 0;

	} while (n >= 0 && slen >= 0 &&
	    regexec_e(re, ps, REG_NOTBOL, 0, le, psl));

	/* Did not find the requested number of matches. */
	if (n > 0)
		return (0);

	/* Copy the trailing retained string. */
	if (slen > 0)
		cspace(&SS, s, slen, APPEND);

	/*
	 * Swap the substitute space and the pattern space, and make sure
	 * that any leftover pointers into stdio memory get lost.
	 */
	tspace = PS;
	PS = SS;
	psanl = tspace.append_newline;
	SS = tspace;
	SS.space = SS.back;

	/* Handle the 'p' flag. */
	if (cp->u.s->p)
		OUT();

	/* Handle the 'w' flag. */
	if (cp->u.s->wfile && !pd) {
		if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile,
		    O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1)
			err(1, "%s", cp->u.s->wfile);
		if (write(cp->u.s->wfd, ps, psl) != (ssize_t)psl ||
		    write(cp->u.s->wfd, "\n", 1) != 1)
			err(1, "%s", cp->u.s->wfile);
	}
	return (1);
}

/*
 * do_tr --
 *	Perform translation ('y' command) in the pattern space.
 */
static void
do_tr(struct s_tr *y)
{
	SPACE tmp;
	char c, *p;
	size_t clen, left;
	int i;

	if (MB_CUR_MAX == 1) {
		/*
		 * Single-byte encoding: perform in-place translation
		 * of the pattern space.
		 */
		for (p = ps; p < &ps[psl]; p++)
			*p = y->bytetab[(u_char)*p];
	} else {
		/*
		 * Multi-byte encoding: perform translation into the
		 * translation space, then swap the translation and
		 * pattern spaces.
		 */
		/* Clean translation space. */
		YS.len = 0;
		for (p = ps, left = psl; left > 0; p += clen, left -= clen) {
			if ((c = y->bytetab[(u_char)*p]) != '\0') {
				cspace(&YS, &c, 1, APPEND);
				clen = 1;
				continue;
			}
			for (i = 0; i < y->nmultis; i++)
				if (left >= y->multis[i].fromlen &&
				    memcmp(p, y->multis[i].from,
				    y->multis[i].fromlen) == 0)
					break;
			if (i < y->nmultis) {
				cspace(&YS, y->multis[i].to,
				    y->multis[i].tolen, APPEND);
				clen = y->multis[i].fromlen;
			} else {
				cspace(&YS, p, 1, APPEND);
				clen = 1;
			}
		}
		/* Swap the translation space and the pattern space. */
		tmp = PS;
		PS = YS;
		psanl = tmp.append_newline;
		YS = tmp;
		YS.space = YS.back;
	}
}

/*
 * Flush append requests.  Always called before reading a line,
 * therefore it also resets the substitution done (sdone) flag.
 */
static void
flush_appends(void)
{
	FILE *f;
	unsigned int count, idx;
	char buf[8 * 1024];

	for (idx = 0; idx < appendx; idx++)
		switch (appends[idx].type) {
		case AP_STRING:
			fwrite(appends[idx].s, sizeof(char), appends[idx].len,
			    outfile);
			break;
		case AP_FILE:
			/*
			 * Read files probably shouldn't be cached.  Since
			 * it's not an error to read a non-existent file,
			 * it's possible that another program is interacting
			 * with the sed script through the filesystem.  It
			 * would be truly bizarre, but possible.  It's probably
			 * not that big a performance win, anyhow.
			 */
			if ((f = fopen(appends[idx].s, "r")) == NULL)
				break;
			while ((count = fread(buf, sizeof(char), sizeof(buf), f)))
				(void)fwrite(buf, sizeof(char), count, outfile);
			(void)fclose(f);
			break;
		}
	if (ferror(outfile))
		errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
	appendx = sdone = 0;
}

static void
lputs(char *s, size_t len)
{
	static const char escapes[] = "\\\a\b\f\r\t\v";
	int c, col, width;
	const char *p;
	struct winsize win;
	static int termwidth = -1;
	size_t clen, i;
	wchar_t wc;
	mbstate_t mbs;

	if (outfile != stdout)
		termwidth = 60;
	if (termwidth == -1) {
		if ((p = getenv("COLUMNS")) && *p != '\0')
			termwidth = atoi(p);
		else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
		    win.ws_col > 0)
			termwidth = win.ws_col;
		else
			termwidth = 60;
	}
	if (termwidth <= 0)
		termwidth = 1;

	memset(&mbs, 0, sizeof(mbs));
	col = 0;
	while (len != 0) {
		clen = mbrtowc(&wc, s, len, &mbs);
		if (clen == 0)
			clen = 1;
		if (clen == (size_t)-1 || clen == (size_t)-2) {
			wc = (unsigned char)*s;
			clen = 1;
			memset(&mbs, 0, sizeof(mbs));
		}
		if (wc == '\n') {
			if (col + 1 >= termwidth)
				fprintf(outfile, "\\\n");
			fputc('$', outfile);
			fputc('\n', outfile);
			col = 0;
		} else if (iswprint(wc)) {
			width = wcwidth(wc);
			if (col + width >= termwidth) {
				fprintf(outfile, "\\\n");
				col = 0;
			}
			fwrite(s, 1, clen, outfile);
			col += width;
		} else if (wc != L'\0' && (c = wctob(wc)) != EOF &&
		    (p = strchr(escapes, c)) != NULL) {
			if (col + 2 >= termwidth) {
				fprintf(outfile, "\\\n");
				col = 0;
			}
			fprintf(outfile, "\\%c", "\\abfrtv"[p - escapes]);
			col += 2;
		} else {
			if (col + 4 * clen >= (unsigned)termwidth) {
				fprintf(outfile, "\\\n");
				col = 0;
			}
			for (i = 0; i < clen; i++)
				fprintf(outfile, "\\%03o",
				    (int)(unsigned char)s[i]);
			col += 4 * clen;
		}
		s += clen;
		len -= clen;
	}
	if (col + 1 >= termwidth)
		fprintf(outfile, "\\\n");
	(void)fputc('$', outfile);
	(void)fputc('\n', outfile);
	if (ferror(outfile))
		errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
}

static int
regexec_e(regex_t *preg, const char *string, int eflags, int nomatch,
	size_t start, size_t stop)
{
	int eval;

	if (preg == NULL) {
		if (defpreg == NULL)
			errx(1, "first RE may not be empty");
	} else
		defpreg = preg;

	/* Set anchors */
	match[0].rm_so = start;
	match[0].rm_eo = stop;

	eval = regexec(defpreg, string,
	    nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND);
	switch(eval) {
	case 0:
		return (1);
	case REG_NOMATCH:
		return (0);
	}
	errx(1, "RE error: %s", strregerror(eval, defpreg));
	/* NOTREACHED */
}

/*
 * regsub - perform substitutions after a regexp match
 * Based on a routine by Henry Spencer
 */
static void
regsub(SPACE *sp, char *string, char *src)
{
	int len, no;
	char c, *dst;

#define	NEEDSP(reqlen)							\
	/* XXX What is the +1 for? */					\
	if (sp->len + (reqlen) + 1 >= sp->blen) {			\
		sp->blen += (reqlen) + 1024;				\
		if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \
		    == NULL)						\
			err(1, "realloc");				\
		dst = sp->space + sp->len;				\
	}

	dst = sp->space + sp->len;
	while ((c = *src++) != '\0') {
		if (c == '&')
			no = 0;
		else if (c == '\\' && isdigit((unsigned char)*src))
			no = *src++ - '0';
		else
			no = -1;
		if (no < 0) {		/* Ordinary character. */
			if (c == '\\' && (*src == '\\' || *src == '&'))
				c = *src++;
			NEEDSP(1);
			*dst++ = c;
			++sp->len;
		} else if (match[no].rm_so != -1 && match[no].rm_eo != -1) {
			len = match[no].rm_eo - match[no].rm_so;
			NEEDSP(len);
			memmove(dst, string + match[no].rm_so, len);
			dst += len;
			sp->len += len;
		}
	}
	NEEDSP(1);
	*dst = '\0';
}

/*
 * cspace --
 *	Concatenate space: append the source space to the destination space,
 *	allocating new space as necessary.
 */
void
cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag)
{
	size_t tlen;

	/* Make sure SPACE has enough memory and ramp up quickly. */
	tlen = sp->len + len + 1;
	if (tlen > sp->blen) {
		sp->blen = tlen + 1024;
		if ((sp->space = sp->back = realloc(sp->back, sp->blen)) ==
		    NULL)
			err(1, "realloc");
	}

	if (spflag == REPLACE)
		sp->len = 0;

	memmove(sp->space + sp->len, p, len);

	sp->space[sp->len += len] = '\0';
}

/*
 * Close all cached opened files and report any errors
 */
void
cfclose(struct s_command *cp, struct s_command *end)
{

	for (; cp != end; cp = cp->next)
		switch(cp->code) {
		case 's':
			if (cp->u.s->wfd != -1 && close(cp->u.s->wfd))
				err(1, "%s", cp->u.s->wfile);
			cp->u.s->wfd = -1;
			break;
		case 'w':
			if (cp->u.fd != -1 && close(cp->u.fd))
				err(1, "%s", cp->t);
			cp->u.fd = -1;
			break;
		case '{':
			cfclose(cp->u.c, cp->next);
			break;
		}
}
