/* glob.c: This file contains the global command routines for the ed line
   editor */
/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1993 Andrew Moore, Talke Studio.
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/types.h>
#include <sys/ioctl.h>
#include <sys/wait.h>

#include "ed.h"


/* build_active_list:  add line matching a pattern to the global-active list */
int
build_active_list(int isgcmd)
{
        pattern_t *pat;
        line_t *lp;
        long n;
        char *s;
        char delimiter;

        if ((delimiter = *ibufp) == ' ' || delimiter == '\n') {
                errmsg = "invalid pattern delimiter";
                return ERR;
        } else if ((pat = get_compiled_pattern()) == NULL)
                return ERR;
        else if (*ibufp == delimiter)
                ibufp++;
        clear_active_list();
        lp = get_addressed_line_node(first_addr);
        for (n = first_addr; n <= second_addr; n++, lp = lp->q_forw) {
                if ((s = get_sbuf_line(lp)) == NULL)
                        return ERR;
                if (isbinary)
                        NUL_TO_NEWLINE(s, lp->len);
                if (!(regexec(pat, s, 0, NULL, 0) == isgcmd) &&
                    set_active_node(lp) < 0)
                        return ERR;
        }
        return 0;
}


/* exec_global: apply command list in the command buffer to the active
   lines in a range; return command status */
long
exec_global(int interact, int gflag)
{
        static char *ocmd = NULL;
        static int ocmdsz = 0;

        line_t *lp = NULL;
        int status;
        int n;
        char *cmd = NULL;

#ifdef BACKWARDS
        if (!interact)
                if (!strcmp(ibufp, "\n"))
                        cmd = "p\n";            /* null cmd-list == `p' */
                else if ((cmd = get_extended_line(&n, 0)) == NULL)
                        return ERR;
#else
        if (!interact && (cmd = get_extended_line(&n, 0)) == NULL)
                return ERR;
#endif
        clear_undo_stack();
        while ((lp = next_active_node()) != NULL) {
                if ((current_addr = get_line_node_addr(lp)) < 0)
                        return ERR;
                if (interact) {
                        /* print current_addr; get a command in global syntax */
                        if (display_lines(current_addr, current_addr, gflag) < 0)
                                return ERR;
                        while ((n = get_tty_line()) > 0 &&
                            ibuf[n - 1] != '\n')
                                clearerr(stdin);
                        if (n < 0)
                                return ERR;
                        else if (n == 0) {
                                errmsg = "unexpected end-of-file";
                                return ERR;
                        } else if (n == 1 && !strcmp(ibuf, "\n"))
                                continue;
                        else if (n == 2 && !strcmp(ibuf, "&\n")) {
                                if (cmd == NULL) {
                                        errmsg = "no previous command";
                                        return ERR;
                                } else cmd = ocmd;
                        } else if ((cmd = get_extended_line(&n, 0)) == NULL)
                                return ERR;
                        else {
                                REALLOC(ocmd, ocmdsz, n + 1, ERR);
                                memcpy(ocmd, cmd, n + 1);
                                cmd = ocmd;
                        }

                }
                ibufp = cmd;
                for (; *ibufp;)
                        if ((status = extract_addr_range()) < 0 ||
                            (status = exec_command()) < 0 ||
                            (status > 0 && (status = display_lines(
                            current_addr, current_addr, status)) < 0))
                                return status;
        }
        return 0;
}


static line_t **active_list;    /* list of lines active in a global command */
static long active_last;        /* index of last active line in active_list */
static long active_size;        /* size of active_list */
static long active_ptr;         /* active_list index (non-decreasing) */
static long active_ndx;         /* active_list index (modulo active_last) */

/* set_active_node: add a line node to the global-active list */
int
set_active_node(line_t *lp)
{
        if (active_last + 1 > active_size) {
                size_t ti = active_size;
                line_t **ts;
                SPL1();
#if defined(sun) || defined(NO_REALLOC_NULL)
                if (active_list != NULL) {
#endif
                        if ((ts = (line_t **) realloc(active_list,
                            (ti += MINBUFSZ) * sizeof(line_t *))) == NULL) {
                                fprintf(stderr, "%s\n", strerror(errno));
                                errmsg = "out of memory";
                                SPL0();
                                return ERR;
                        }
#if defined(sun) || defined(NO_REALLOC_NULL)
                } else {
                        if ((ts = (line_t **) malloc((ti += MINBUFSZ) *
                            sizeof(line_t **))) == NULL) {
                                fprintf(stderr, "%s\n", strerror(errno));
                                errmsg = "out of memory";
                                SPL0();
                                return ERR;
                        }
                }
#endif
                active_size = ti;
                active_list = ts;
                SPL0();
        }
        active_list[active_last++] = lp;
        return 0;
}


/* unset_active_nodes: remove a range of lines from the global-active list */
void
unset_active_nodes(line_t *np, line_t *mp)
{
        line_t *lp;
        long i;

        for (lp = np; lp != mp; lp = lp->q_forw)
                for (i = 0; i < active_last; i++)
                        if (active_list[active_ndx] == lp) {
                                active_list[active_ndx] = NULL;
                                active_ndx = INC_MOD(active_ndx, active_last - 1);
                                break;
                        } else  active_ndx = INC_MOD(active_ndx, active_last - 1);
}


/* next_active_node: return the next global-active line node */
line_t *
next_active_node(void)
{
        while (active_ptr < active_last && active_list[active_ptr] == NULL)
                active_ptr++;
        return (active_ptr < active_last) ? active_list[active_ptr++] : NULL;
}


/* clear_active_list: clear the global-active list */
void
clear_active_list(void)
{
        SPL1();
        active_size = active_last = active_ptr = active_ndx = 0;
        free(active_list);
        active_list = NULL;
        SPL0();
}