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options.c

/*-
 * Copyright (c) 1991, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1991, 1993, 1994, 1995, 1996
 *    Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)options.c     10.51 (Berkeley) 10/14/96";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "common.h"
#include "../vi/vi.h"
#include "pathnames.h"

static int         opts_abbcmp __P((const void *, const void *));
static int         opts_cmp __P((const void *, const void *));
static int         opts_print __P((SCR *, OPTLIST const *));

/*
 * O'Reilly noted options and abbreviations are from "Learning the VI Editor",
 * Fifth Edition, May 1992.  There's no way of knowing what systems they are
 * actually from.
 *
 * HPUX noted options and abbreviations are from "The Ultimate Guide to the
 * VI and EX Text Editors", 1990.
 */
OPTLIST const optlist[] = {
/* O_ALTWERASE      4.4BSD */
      {"altwerase",     f_altwerase,      OPT_0BOOL,  0},
/* O_AUTOINDENT       4BSD */
      {"autoindent",    NULL,       OPT_0BOOL,  0},
/* O_AUTOPRINT        4BSD */
      {"autoprint",     NULL,       OPT_1BOOL,  0},
/* O_AUTOWRITE        4BSD */
      {"autowrite",     NULL,       OPT_0BOOL,  0},
/* O_BACKUP   4.4BSD */
      {"backup",  NULL,       OPT_STR,    0},
/* O_BEAUTIFY         4BSD */
      {"beautify",      NULL,       OPT_0BOOL,  0},
/* O_CDPATH   4.4BSD */
      {"cdpath",  NULL,       OPT_STR,    0},
/* O_CEDIT    4.4BSD */
      {"cedit",   NULL,       OPT_STR,    0},
/* O_COLUMNS        4.4BSD */
      {"columns", f_columns,  OPT_NUM,    OPT_NOSAVE},
/* O_COMMENT        4.4BSD */
      {"comment", NULL,       OPT_0BOOL,  0},
/* O_DIRECTORY        4BSD */
      {"directory",     NULL,       OPT_STR,    0},
/* O_EDCOMPATIBLE   4BSD */
      {"edcompatible",NULL,         OPT_0BOOL,  0},
/* O_ESCAPETIME     4.4BSD */
      {"escapetime",    NULL,       OPT_NUM,    0},
/* O_ERRORBELLS       4BSD */
      {"errorbells",    NULL,       OPT_0BOOL,  0},
/* O_EXRC   System V (undocumented) */
      {"exrc",    NULL,       OPT_0BOOL,  0},
/* O_EXTENDED       4.4BSD */
      {"extended",      f_recompile,      OPT_0BOOL,  0},
/* O_FILEC    4.4BSD */
      {"filec",   NULL,       OPT_STR,    0},
/* O_FLASH      HPUX */
      {"flash",   NULL,       OPT_1BOOL,  0},
/* O_HARDTABS         4BSD */
      {"hardtabs",      NULL,       OPT_NUM,    0},
/* O_ICLOWER        4.4BSD */
      {"iclower", f_recompile,      OPT_0BOOL,  0},
/* O_IGNORECASE       4BSD */
      {"ignorecase",    f_recompile,      OPT_0BOOL,  0},
/* O_KEYTIME        4.4BSD */
      {"keytime", NULL,       OPT_NUM,    0},
/* O_LEFTRIGHT      4.4BSD */
      {"leftright",     f_reformat, OPT_0BOOL,  0},
/* O_LINES    4.4BSD */
      {"lines",   f_lines,    OPT_NUM,    OPT_NOSAVE},
/* O_LISP       4BSD
 *    XXX
 *    When the lisp option is implemented, delete the OPT_NOSAVE flag,
 *    so that :mkexrc dumps it.
 */
      {"lisp",    f_lisp,           OPT_0BOOL,  OPT_NOSAVE},
/* O_LIST       4BSD */
      {"list",    f_reformat, OPT_0BOOL,  0},
/* O_LOCKFILES      4.4BSD
 *    XXX
 *    Locking isn't reliable enough over NFS to require it, in addition,
 *    it's a serious startup performance problem over some remote links.
 */
      {"lock",    NULL,       OPT_1BOOL,  0},
/* O_MAGIC      4BSD */
      {"magic",   NULL,       OPT_1BOOL,  0},
/* O_MATCHTIME      4.4BSD */
      {"matchtime",     NULL,       OPT_NUM,    0},
/* O_MESG       4BSD */
      {"mesg",    NULL,       OPT_1BOOL,  0},
/* O_MODELINE         4BSD
 *    !!!
 *    This has been documented in historical systems as both "modeline"
 *    and as "modelines".  Regardless of the name, this option represents
 *    a security problem of mammoth proportions, not to mention a stunning
 *    example of what your intro CS professor referred to as the perils of
 *    mixing code and data.  Don't add it, or I will kill you.
 */
      {"modeline",      NULL,       OPT_0BOOL,  OPT_NOSET},
/* O_MSGCAT   4.4BSD */
      {"msgcat",  f_msgcat,   OPT_STR,    0},
/* O_NOPRINT        4.4BSD */
      {"noprint", f_print,    OPT_STR,    0},
/* O_NUMBER     4BSD */
      {"number",  f_reformat, OPT_0BOOL,  0},
/* O_OCTAL    4.4BSD */
      {"octal",   f_print,    OPT_0BOOL,  0},
/* O_OPEN       4BSD */
      {"open",    NULL,       OPT_1BOOL,  0},
/* O_OPTIMIZE         4BSD */
      {"optimize",      NULL,       OPT_1BOOL,  0},
/* O_PARAGRAPHS       4BSD */
      {"paragraphs",    f_paragraph,      OPT_STR,    0},
/* O_PATH     4.4BSD */
      {"path",    NULL,       OPT_STR,    0},
/* O_PRINT    4.4BSD */
      {"print",   f_print,    OPT_STR,    0},
/* O_PROMPT     4BSD */
      {"prompt",  NULL,       OPT_1BOOL,  0},
/* O_READONLY         4BSD (undocumented) */
      {"readonly",      f_readonly, OPT_0BOOL,  OPT_ALWAYS},
/* O_RECDIR   4.4BSD */
      {"recdir",  NULL,       OPT_STR,    0},
/* O_REDRAW     4BSD */
      {"redraw",  NULL,       OPT_0BOOL,  0},
/* O_REMAP      4BSD */
      {"remap",   NULL,       OPT_1BOOL,  0},
/* O_REPORT     4BSD */
      {"report",  NULL,       OPT_NUM,    0},
/* O_RULER    4.4BSD */
      {"ruler",   NULL,       OPT_0BOOL,  0},
/* O_SCROLL     4BSD */
      {"scroll",  NULL,       OPT_NUM,    0},
/* O_SEARCHINCR     4.4BSD */
      {"searchincr",    NULL,       OPT_0BOOL,  0},
/* O_SECTIONS         4BSD */
      {"sections",      f_section,  OPT_STR,    0},
/* O_SECURE   4.4BSD */
      {"secure",  NULL,       OPT_0BOOL,  OPT_NOUNSET},
/* O_SHELL      4BSD */
      {"shell",   NULL,       OPT_STR,    0},
/* O_SHELLMETA      4.4BSD */
      {"shellmeta",     NULL,       OPT_STR,    0},
/* O_SHIFTWIDTH       4BSD */
      {"shiftwidth",    NULL,       OPT_NUM,    OPT_NOZERO},
/* O_SHOWMATCH        4BSD */
      {"showmatch",     NULL,       OPT_0BOOL,  0},
/* O_SHOWMODE       4.4BSD */
      {"showmode",      NULL,       OPT_0BOOL,  0},
/* O_SIDESCROLL     4.4BSD */
      {"sidescroll",    NULL,       OPT_NUM,    OPT_NOZERO},
/* O_SLOWOPEN         4BSD  */
      {"slowopen",      NULL,       OPT_0BOOL,  0},
/* O_SOURCEANY        4BSD (undocumented)
 *    !!!
 *    Historic vi, on startup, source'd $HOME/.exrc and ./.exrc, if they
 *    were owned by the user.  The sourceany option was an undocumented
 *    feature of historic vi which permitted the startup source'ing of
 *    .exrc files the user didn't own.  This is an obvious security problem,
 *    and we ignore the option.
 */
      {"sourceany",     NULL,       OPT_0BOOL,  OPT_NOSET},
/* O_TABSTOP          4BSD */
      {"tabstop", f_reformat, OPT_NUM,    OPT_NOZERO},
/* O_TAGLENGTH        4BSD */
      {"taglength",     NULL,       OPT_NUM,    0},
/* O_TAGS       4BSD */
      {"tags",    NULL,       OPT_STR,    0},
/* O_TERM       4BSD
 *    !!!
 *    By default, the historic vi always displayed information about two
 *    options, redraw and term.  Term seems sufficient.
 */
      {"term",    NULL,       OPT_STR,    OPT_ADISP|OPT_NOSAVE},
/* O_TERSE      4BSD */
      {"terse",   NULL,       OPT_0BOOL,  0},
/* O_TILDEOP      4.4BSD */
      {"tildeop", NULL,       OPT_0BOOL,  0},
/* O_TIMEOUT          4BSD (undocumented) */
      {"timeout", NULL,       OPT_1BOOL,  0},
/* O_TTYWERASE      4.4BSD */
      {"ttywerase",     f_ttywerase,      OPT_0BOOL,  0},
/* O_VERBOSE        4.4BSD */
      {"verbose", NULL,       OPT_0BOOL,  0},
/* O_W1200      4BSD */
      {"w1200",   f_w1200,    OPT_NUM,    OPT_NDISP|OPT_NOSAVE},
/* O_W300       4BSD */
      {"w300",    f_w300,           OPT_NUM,    OPT_NDISP|OPT_NOSAVE},
/* O_W9600      4BSD */
      {"w9600",   f_w9600,    OPT_NUM,    OPT_NDISP|OPT_NOSAVE},
/* O_WARN       4BSD */
      {"warn",    NULL,       OPT_1BOOL,  0},
/* O_WINDOW     4BSD */
      {"window",  f_window,   OPT_NUM,    0},
/* O_WINDOWNAME       4BSD */
      {"windowname",    NULL,       OPT_0BOOL,  0},
/* O_WRAPLEN        4.4BSD */
      {"wraplen", NULL,       OPT_NUM,    0},
/* O_WRAPMARGIN       4BSD */
      {"wrapmargin",    NULL,       OPT_NUM,    0},
/* O_WRAPSCAN         4BSD */
      {"wrapscan",      NULL,       OPT_1BOOL,  0},
/* O_WRITEANY         4BSD */
      {"writeany",      NULL,       OPT_0BOOL,  0},
      {NULL},
};

typedef struct abbrev {
        char *name;
        int offset;
} OABBREV;

static OABBREV const abbrev[] = {
      {"ai",            O_AUTOINDENT},          /*     4BSD */
      {"ap",            O_AUTOPRINT},           /*     4BSD */
      {"aw",            O_AUTOWRITE},           /*     4BSD */
      {"bf",            O_BEAUTIFY},            /*     4BSD */
      {"co",            O_COLUMNS},       /*   4.4BSD */
      {"dir",           O_DIRECTORY},           /*     4BSD */
      {"eb",            O_ERRORBELLS},          /*     4BSD */
      {"ed",            O_EDCOMPATIBLE},  /*     4BSD */
      {"ex",            O_EXRC},          /* System V (undocumented) */
      {"ht",            O_HARDTABS},            /*     4BSD */
      {"ic",            O_IGNORECASE},          /*     4BSD */
      {"li",            O_LINES},         /*   4.4BSD */
      {"modelines",     O_MODELINE},            /*     HPUX */
      {"nu",            O_NUMBER},        /*     4BSD */
      {"opt",           O_OPTIMIZE},            /*     4BSD */
      {"para",    O_PARAGRAPHS},          /*     4BSD */
      {"re",            O_REDRAW},        /* O'Reilly */
      {"ro",            O_READONLY},            /*     4BSD (undocumented) */
      {"scr",           O_SCROLL},        /*     4BSD (undocumented) */
      {"sect",    O_SECTIONS},            /* O'Reilly */
      {"sh",            O_SHELL},         /*     4BSD */
      {"slow",    O_SLOWOPEN},            /*     4BSD */
      {"sm",            O_SHOWMATCH},           /*     4BSD */
      {"smd",           O_SHOWMODE},            /*     4BSD */
      {"sw",            O_SHIFTWIDTH},          /*     4BSD */
      {"tag",           O_TAGS},          /*     4BSD (undocumented) */
      {"tl",            O_TAGLENGTH},           /*     4BSD */
      {"to",            O_TIMEOUT},       /*     4BSD (undocumented) */
      {"ts",            O_TABSTOP},       /*     4BSD */
      {"tty",           O_TERM},          /*     4BSD (undocumented) */
      {"ttytype", O_TERM},          /*     4BSD (undocumented) */
      {"w",       O_WINDOW},        /* O'Reilly */
      {"wa",            O_WRITEANY},            /*     4BSD */
      {"wi",            O_WINDOW},        /*     4BSD (undocumented) */
      {"wl",            O_WRAPLEN},       /*   4.4BSD */
      {"wm",            O_WRAPMARGIN},          /*     4BSD */
      {"ws",            O_WRAPSCAN},            /*     4BSD */
      {NULL},
};

/*
 * opts_init --
 *    Initialize some of the options.
 *
 * PUBLIC: int opts_init __P((SCR *, int *));
 */
int
opts_init(sp, oargs)
      SCR *sp;
      int *oargs;
{
      ARGS *argv[2], a, b;
      OPTLIST const *op;
      u_long v;
      int cnt, optindx;
      char *s, b1[1024];

      a.bp = b1;
      b.bp = NULL;
      a.len = b.len = 0;
      argv[0] = &a;
      argv[1] = &b;

      /* Set numeric and string default values. */
#define     OI(indx, str) {                                       \
      if (str != b1)          /* GCC puts strings in text-space. */     \
            (void)strcpy(b1, str);                          \
      a.len = strlen(b1);                                   \
      if (opts_set(sp, argv, NULL)) {                             \
             optindx = indx;                          \
            goto err;                                 \
      }                                               \
}
      /*
       * Indirect global options to global space.  Specifically, set up
       * terminal, lines, columns first, they're used by other options.
       * Note, don't set the flags until we've set up the indirection.
       */
      if (o_set(sp, O_TERM, 0, NULL, GO_TERM))
            goto err;
      F_SET(&sp->opts[O_TERM], OPT_GLOBAL);
      if (o_set(sp, O_LINES, 0, NULL, GO_LINES))
            goto err;
      F_SET(&sp->opts[O_LINES], OPT_GLOBAL);
      if (o_set(sp, O_COLUMNS, 0, NULL, GO_COLUMNS))
            goto err;
      F_SET(&sp->opts[O_COLUMNS], OPT_GLOBAL);
      if (o_set(sp, O_SECURE, 0, NULL, GO_SECURE))
            goto err;
      F_SET(&sp->opts[O_SECURE], OPT_GLOBAL);

      /* Initialize string values. */
      (void)snprintf(b1, sizeof(b1),
          "cdpath=%s", (s = getenv("CDPATH")) == NULL ? ":" : s);
      OI(O_CDPATH, b1);

      /*
       * !!!
       * Vi historically stored temporary files in /var/tmp.  We store them
       * in /tmp by default, hoping it's a memory based file system.  There
       * are two ways to change this -- the user can set either the directory
       * option or the TMPDIR environmental variable.
       */
      (void)snprintf(b1, sizeof(b1),
          "directory=%s", (s = getenv("TMPDIR")) == NULL ? _PATH_TMP : s);
      OI(O_DIRECTORY, b1);
      OI(O_ESCAPETIME, "escapetime=1");
      OI(O_KEYTIME, "keytime=6");
      OI(O_MATCHTIME, "matchtime=7");
      (void)snprintf(b1, sizeof(b1), "msgcat=%s", _PATH_MSGCAT);
      OI(O_MSGCAT, b1);
      OI(O_REPORT, "report=5");
      OI(O_PARAGRAPHS, "paragraphs=IPLPPPQPP LIpplpipbp");
      (void)snprintf(b1, sizeof(b1), "path=%s", "");
      OI(O_PATH, b1);
      (void)snprintf(b1, sizeof(b1), "recdir=%s", _PATH_PRESERVE);
      OI(O_RECDIR, b1);
      OI(O_SECTIONS, "sections=NHSHH HUnhsh");
      (void)snprintf(b1, sizeof(b1),
          "shell=%s", (s = getenv("SHELL")) == NULL ? _PATH_BSHELL : s);
      OI(O_SHELL, b1);
      OI(O_SHELLMETA, "shellmeta=~{[*?$`'\"\\");
      OI(O_SHIFTWIDTH, "shiftwidth=8");
      OI(O_SIDESCROLL, "sidescroll=16");
      OI(O_TABSTOP, "tabstop=8");
      (void)snprintf(b1, sizeof(b1), "tags=%s", _PATH_TAGS);
      OI(O_TAGS, b1);

      /*
       * XXX
       * Initialize O_SCROLL here, after term; initializing term should
       * have created a LINES/COLUMNS value.
       */
      if ((v = (O_VAL(sp, O_LINES) - 1) / 2) == 0)
            v = 1;
      (void)snprintf(b1, sizeof(b1), "scroll=%ld", v);
      OI(O_SCROLL, b1);

      /*
       * The default window option values are:
       *          8 if baud rate <=  600
       *           16 if baud rate <= 1200
       *    LINES - 1 if baud rate  > 1200
       *
       * Note, the windows option code will correct any too-large value
       * or when the O_LINES value is 1.
       */
      if (sp->gp->scr_baud(sp, &v))
            return (1);
      if (v <= 600)
            v = 8;
      else if (v <= 1200)
            v = 16;
      else
            v = O_VAL(sp, O_LINES) - 1;
      (void)snprintf(b1, sizeof(b1), "window=%lu", v);
      OI(O_WINDOW, b1);

      /*
       * Set boolean default values, and copy all settings into the default
       * information.  OS_NOFREE is set, we're copying, not replacing.
       */
      for (op = optlist, cnt = 0; op->name != NULL; ++op, ++cnt)
            switch (op->type) {
            case OPT_0BOOL:
                  break;
            case OPT_1BOOL:
                  O_SET(sp, cnt);
                  O_D_SET(sp, cnt);
                  break;
            case OPT_NUM:
                  o_set(sp, cnt, OS_DEF, NULL, O_VAL(sp, cnt));
                  break;
            case OPT_STR:
                  if (O_STR(sp, cnt) != NULL && o_set(sp, cnt,
                      OS_DEF | OS_NOFREE | OS_STRDUP, O_STR(sp, cnt), 0))
                        goto err;
                  break;
            default:
                  abort();
            }

      /*
       * !!!
       * Some options can be initialized by the command name or the
       * command-line arguments.  They don't set the default values,
       * it's historic practice.
       */
      for (; *oargs != -1; ++oargs)
            OI(*oargs, optlist[*oargs].name);
      return (0);
#undef OI

err:  msgq(sp, M_ERR,
          "031|Unable to set default %s option", optlist[optindx].name);
      return (1);
}

/*
 * opts_set --
 *    Change the values of one or more options.
 *
 * PUBLIC: int opts_set __P((SCR *, ARGS *[], char *));
 */
int
opts_set(sp, argv, usage)
      SCR *sp;
      ARGS *argv[];
      char *usage;
{
      enum optdisp disp;
      enum nresult nret;
      OPTLIST const *op;
      OPTION *spo;
      u_long value, turnoff;
      int ch, equals, nf, nf2, offset, qmark, rval;
      char *endp, *name, *p, *sep, *t;

      disp = NO_DISPLAY;
      for (rval = 0; argv[0]->len != 0; ++argv) {
            /*
             * The historic vi dumped the options for each occurrence of
             * "all" in the set list.  Puhleeze.
             */
            if (!strcmp(argv[0]->bp, "all")) {
                  disp = ALL_DISPLAY;
                  continue;
            }

            /* Find equals sign or question mark. */
            for (sep = NULL, equals = qmark = 0,
                p = name = argv[0]->bp; (ch = *p) != '\0'; ++p)
                  if (ch == '=' || ch == '?') {
                        if (p == name) {
                              if (usage != NULL)
                                    msgq(sp, M_ERR,
                                        "032|Usage: %s", usage);
                              return (1);
                        }
                        sep = p;
                        if (ch == '=')
                              equals = 1;
                        else
                              qmark = 1;
                        break;
                  }

            turnoff = 0;
            op = NULL;
            if (sep != NULL)
                  *sep++ = '\0';

            /* Search for the name, then name without any leading "no". */
            if ((op = opts_search(name)) == NULL &&
                name[0] == 'n' && name[1] == 'o') {
                  turnoff = 1;
                  name += 2;
                  op = opts_search(name);
            }
            if (op == NULL) {
                  opts_nomatch(sp, name);
                  rval = 1;
                  continue;
            }

            /* Find current option values. */
            offset = op - optlist;
            spo = sp->opts + offset;

            /*
             * !!!
             * Historically, the question mark could be a separate
             * argument.
             */
            if (!equals && !qmark &&
                argv[1]->len == 1 && argv[1]->bp[0] == '?') {
                  ++argv;
                  qmark = 1;
            }

            /* Set name, value. */
            switch (op->type) {
            case OPT_0BOOL:
            case OPT_1BOOL:
                  /* Some options may not be reset. */
                  if (F_ISSET(op, OPT_NOUNSET) && turnoff) {
                        msgq_str(sp, M_ERR, name,
                      "291|set: the %s option may not be turned off");
                        rval = 1;
                        break;
                  }

                  /* Some options may not be set. */
                  if (F_ISSET(op, OPT_NOSET) && !turnoff) {
                        msgq_str(sp, M_ERR, name,
                      "313|set: the %s option may never be turned on");
                        rval = 1;
                        break;
                  }

                  if (equals) {
                        msgq_str(sp, M_ERR, name,
                      "034|set: [no]%s option doesn't take a value");
                        rval = 1;
                        break;
                  }
                  if (qmark) {
                        if (!disp)
                              disp = SELECT_DISPLAY;
                        F_SET(spo, OPT_SELECTED);
                        break;
                  }

                  /*
                   * Do nothing if the value is unchanged, the underlying
                   * functions can be expensive.
                   */
                  if (!F_ISSET(op, OPT_ALWAYS))
                        if (turnoff) {
                              if (!O_ISSET(sp, offset))
                                    break;
                        } else {
                              if (O_ISSET(sp, offset))
                                    break;
                        }

                  /* Report to subsystems. */
                  if (op->func != NULL &&
                      op->func(sp, spo, NULL, &turnoff) ||
                      ex_optchange(sp, offset, NULL, &turnoff) ||
                      v_optchange(sp, offset, NULL, &turnoff) ||
                      sp->gp->scr_optchange(sp, offset, NULL, &turnoff)) {
                        rval = 1;
                        break;
                  }

                  /* Set the value. */
                  if (turnoff)
                        O_CLR(sp, offset);
                  else
                        O_SET(sp, offset);
                  break;
            case OPT_NUM:
                  if (turnoff) {
                        msgq_str(sp, M_ERR, name,
                            "035|set: %s option isn't a boolean");
                        rval = 1;
                        break;
                  }
                  if (qmark || !equals) {
                        if (!disp)
                              disp = SELECT_DISPLAY;
                        F_SET(spo, OPT_SELECTED);
                        break;
                  }

                  if (!isdigit(sep[0]))
                        goto badnum;
                  if ((nret =
                      nget_uslong(&value, sep, &endp, 10)) != NUM_OK) {
                        p = msg_print(sp, name, &nf);
                        t = msg_print(sp, sep, &nf2);
                        switch (nret) {
                        case NUM_ERR:
                              msgq(sp, M_SYSERR,
                                  "036|set: %s option: %s", p, t);
                              break;
                        case NUM_OVER:
                              msgq(sp, M_ERR,
                      "037|set: %s option: %s: value overflow", p, t);
                              break;
                        case NUM_OK:
                        case NUM_UNDER:
                              abort();
                        }
                        if (nf)
                              FREE_SPACE(sp, p, 0);
                        if (nf2)
                              FREE_SPACE(sp, t, 0);
                        rval = 1;
                        break;
                  }
                  if (*endp && !isblank(*endp)) {
badnum:                       p = msg_print(sp, name, &nf);
                        t = msg_print(sp, sep, &nf2);
                        msgq(sp, M_ERR,
                "038|set: %s option: %s is an illegal number", p, t);
                        if (nf)
                              FREE_SPACE(sp, p, 0);
                        if (nf2)
                              FREE_SPACE(sp, t, 0);
                        rval = 1;
                        break;
                  }

                  /* Some options may never be set to zero. */
                  if (F_ISSET(op, OPT_NOZERO) && value == 0) {
                        msgq_str(sp, M_ERR, name,
                      "314|set: the %s option may never be set to 0");
                        rval = 1;
                        break;
                  }

                  /*
                   * Do nothing if the value is unchanged, the underlying
                   * functions can be expensive.
                   */
                  if (!F_ISSET(op, OPT_ALWAYS) &&
                      O_VAL(sp, offset) == value)
                        break;

                  /* Report to subsystems. */
                  if (op->func != NULL &&
                      op->func(sp, spo, sep, &value) ||
                      ex_optchange(sp, offset, sep, &value) ||
                      v_optchange(sp, offset, sep, &value) ||
                      sp->gp->scr_optchange(sp, offset, sep, &value)) {
                        rval = 1;
                        break;
                  }

                  /* Set the value. */
                  if (o_set(sp, offset, 0, NULL, value))
                        rval = 1;
                  break;
            case OPT_STR:
                  if (turnoff) {
                        msgq_str(sp, M_ERR, name,
                            "039|set: %s option isn't a boolean");
                        rval = 1;
                        break;
                  }
                  if (qmark || !equals) {
                        if (!disp)
                              disp = SELECT_DISPLAY;
                        F_SET(spo, OPT_SELECTED);
                        break;
                  }

                  /*
                   * Do nothing if the value is unchanged, the underlying
                   * functions can be expensive.
                   */
                  if (!F_ISSET(op, OPT_ALWAYS) &&
                      O_STR(sp, offset) != NULL &&
                      !strcmp(O_STR(sp, offset), sep))
                        break;

                  /* Report to subsystems. */
                  if (op->func != NULL &&
                      op->func(sp, spo, sep, NULL) ||
                      ex_optchange(sp, offset, sep, NULL) ||
                      v_optchange(sp, offset, sep, NULL) ||
                      sp->gp->scr_optchange(sp, offset, sep, NULL)) {
                        rval = 1;
                        break;
                  }

                  /* Set the value. */
                  if (o_set(sp, offset, OS_STRDUP, sep, 0))
                        rval = 1;
                  break;
            default:
                  abort();
            }
      }
      if (disp != NO_DISPLAY)
            opts_dump(sp, disp);
      return (rval);
}

/*
 * o_set --
 *    Set an option's value.
 *
 * PUBLIC: int o_set __P((SCR *, int, u_int, char *, u_long));
 */
int
o_set(sp, opt, flags, str, val)
      SCR *sp;
      int opt;
      u_int flags;
      char *str;
      u_long val;
{
      OPTION *op;

      /* Set a pointer to the options area. */
      op = F_ISSET(&sp->opts[opt], OPT_GLOBAL) ?
          &sp->gp->opts[sp->opts[opt].o_cur.val] : &sp->opts[opt];

      /* Copy the string, if requested. */
      if (LF_ISSET(OS_STRDUP) && (str = strdup(str)) == NULL) {
            msgq(sp, M_SYSERR, NULL);
            return (1);
      }

      /* Free the previous string, if requested, and set the value. */
      if LF_ISSET(OS_DEF)
            if (LF_ISSET(OS_STR | OS_STRDUP)) {
                  if (!LF_ISSET(OS_NOFREE) && op->o_def.str != NULL)
                        free(op->o_def.str);
                  op->o_def.str = str;
            } else
                  op->o_def.val = val;
      else
            if (LF_ISSET(OS_STR | OS_STRDUP)) {
                  if (!LF_ISSET(OS_NOFREE) && op->o_cur.str != NULL)
                        free(op->o_cur.str);
                  op->o_cur.str = str;
            } else
                  op->o_cur.val = val;
      return (0);
}

/*
 * opts_empty --
 *    Return 1 if the string option is invalid, 0 if it's OK.
 *
 * PUBLIC: int opts_empty __P((SCR *, int, int));
 */
int
opts_empty(sp, off, silent)
      SCR *sp;
      int off, silent;
{
      char *p;

      if ((p = O_STR(sp, off)) == NULL || p[0] == '\0') {
            if (!silent)
                  msgq_str(sp, M_ERR, optlist[off].name,
                      "305|No %s edit option specified");
            return (1);
      }
      return (0);
}

/*
 * opts_dump --
 *    List the current values of selected options.
 *
 * PUBLIC: void opts_dump __P((SCR *, enum optdisp));
 */
void
opts_dump(sp, type)
      SCR *sp;
      enum optdisp type;
{
      OPTLIST const *op;
      int base, b_num, cnt, col, colwidth, curlen, s_num;
      int numcols, numrows, row;
      int b_op[O_OPTIONCOUNT], s_op[O_OPTIONCOUNT];
      char nbuf[20];

      /*
       * Options are output in two groups -- those that fit in a column and
       * those that don't.  Output is done on 6 character "tab" boundaries
       * for no particular reason.  (Since we don't output tab characters,
       * we can ignore the terminal's tab settings.)  Ignore the user's tab
       * setting because we have no idea how reasonable it is.
       *
       * Find a column width we can live with, testing from 10 columns to 1.
       */
      for (numcols = 10; numcols > 1; --numcols) {
            colwidth = sp->cols / numcols & ~(STANDARD_TAB - 1);
            if (colwidth >= 10) {
                  colwidth =
                      (colwidth + STANDARD_TAB) & ~(STANDARD_TAB - 1);
                  numcols = sp->cols / colwidth;
                  break;
            }
            colwidth = 0;
      }

      /*
       * Get the set of options to list, entering them into
       * the column list or the overflow list.
       */
      for (b_num = s_num = 0, op = optlist; op->name != NULL; ++op) {
            cnt = op - optlist;

            /* If OPT_NDISP set, it's never displayed. */
            if (F_ISSET(op, OPT_NDISP))
                  continue;

            switch (type) {
            case ALL_DISPLAY:       /* Display all. */
                  break;
            case CHANGED_DISPLAY:         /* Display changed. */
                  /* If OPT_ADISP set, it's always "changed". */
                  if (F_ISSET(op, OPT_ADISP))
                        break;
                  switch (op->type) {
                  case OPT_0BOOL:
                  case OPT_1BOOL:
                  case OPT_NUM:
                        if (O_VAL(sp, cnt) == O_D_VAL(sp, cnt))
                              continue;
                        break;
                  case OPT_STR:
                        if (O_STR(sp, cnt) == O_D_STR(sp, cnt) ||
                            O_D_STR(sp, cnt) != NULL &&
                            !strcmp(O_STR(sp, cnt), O_D_STR(sp, cnt)))
                              continue;
                        break;
                  }
                  break;
            case SELECT_DISPLAY:          /* Display selected. */
                  if (!F_ISSET(&sp->opts[cnt], OPT_SELECTED))
                        continue;
                  break;
            default:
            case NO_DISPLAY:
                  abort();
            }
            F_CLR(&sp->opts[cnt], OPT_SELECTED);

            curlen = strlen(op->name);
            switch (op->type) {
            case OPT_0BOOL:
            case OPT_1BOOL:
                  if (!O_ISSET(sp, cnt))
                        curlen += 2;
                  break;
            case OPT_NUM:
                  (void)snprintf(nbuf,
                      sizeof(nbuf), "%ld", O_VAL(sp, cnt));
                  curlen += strlen(nbuf);
                  break;
            case OPT_STR:
                  if (O_STR(sp, cnt) != NULL)
                        curlen += strlen(O_STR(sp, cnt));
                  curlen += 3;
                  break;
            }
            /* Offset by 2 so there's a gap. */
            if (curlen <= colwidth - 2)
                  s_op[s_num++] = cnt;
            else
                  b_op[b_num++] = cnt;
      }

      if (s_num > 0) {
            /* Figure out the number of rows. */
            if (s_num > numcols) {
                  numrows = s_num / numcols;
                  if (s_num % numcols)
                        ++numrows;
            } else
                  numrows = 1;

            /* Display the options in sorted order. */
            for (row = 0; row < numrows;) {
                  for (base = row, col = 0; col < numcols; ++col) {
                        cnt = opts_print(sp, &optlist[s_op[base]]);
                        if ((base += numrows) >= s_num)
                              break;
                        (void)ex_printf(sp, "%*s",
                            (int)(colwidth - cnt), "");
                  }
                  if (++row < numrows || b_num)
                        (void)ex_puts(sp, "\n");
            }
      }

      for (row = 0; row < b_num;) {
            (void)opts_print(sp, &optlist[b_op[row]]);
            if (++row < b_num)
                  (void)ex_puts(sp, "\n");
      }
      (void)ex_puts(sp, "\n");
}

/*
 * opts_print --
 *    Print out an option.
 */
static int
opts_print(sp, op)
      SCR *sp;
      OPTLIST const *op;
{
      int curlen, offset;

      curlen = 0;
      offset = op - optlist;
      switch (op->type) {
      case OPT_0BOOL:
      case OPT_1BOOL:
            curlen += ex_printf(sp,
                "%s%s", O_ISSET(sp, offset) ? "" : "no", op->name);
            break;
      case OPT_NUM:
            curlen += ex_printf(sp, "%s=%ld", op->name, O_VAL(sp, offset));
            break;
      case OPT_STR:
            curlen += ex_printf(sp, "%s=\"%s\"", op->name,
                O_STR(sp, offset) == NULL ? "" : O_STR(sp, offset));
            break;
      }
      return (curlen);
}

/*
 * opts_save --
 *    Write the current configuration to a file.
 *
 * PUBLIC: int opts_save __P((SCR *, FILE *));
 */
int
opts_save(sp, fp)
      SCR *sp;
      FILE *fp;
{
      OPTLIST const *op;
      int ch, cnt;
      char *p;

      for (op = optlist; op->name != NULL; ++op) {
            if (F_ISSET(op, OPT_NOSAVE))
                  continue;
            cnt = op - optlist;
            switch (op->type) {
            case OPT_0BOOL:
            case OPT_1BOOL:
                  if (O_ISSET(sp, cnt))
                        (void)fprintf(fp, "set %s\n", op->name);
                  else
                        (void)fprintf(fp, "set no%s\n", op->name);
                  break;
            case OPT_NUM:
                  (void)fprintf(fp,
                      "set %s=%-3ld\n", op->name, O_VAL(sp, cnt));
                  break;
            case OPT_STR:
                  if (O_STR(sp, cnt) == NULL)
                        break;
                  (void)fprintf(fp, "set ");
                  for (p = op->name; (ch = *p) != '\0'; ++p) {
                        if (isblank(ch) || ch == '\\')
                              (void)putc('\\', fp);
                        (void)putc(ch, fp);
                  }
                  (void)putc('=', fp);
                  for (p = O_STR(sp, cnt); (ch = *p) != '\0'; ++p) {
                        if (isblank(ch) || ch == '\\')
                              (void)putc('\\', fp);
                        (void)putc(ch, fp);
                  }
                  (void)putc('\n', fp);
                  break;
            }
            if (ferror(fp)) {
                  msgq(sp, M_SYSERR, NULL);
                  return (1);
            }
      }
      return (0);
}

/* 
 * opts_search --
 *    Search for an option.
 *
 * PUBLIC: OPTLIST const *opts_search __P((char *));
 */
OPTLIST const *
opts_search(name)
      char *name;
{
      OPTLIST const *op, *found;
      OABBREV atmp, *ap;
      OPTLIST otmp;
      size_t len;

      /* Check list of abbreviations. */
      atmp.name = name;
      if ((ap = bsearch(&atmp, abbrev, sizeof(abbrev) / sizeof(OABBREV) - 1,
          sizeof(OABBREV), opts_abbcmp)) != NULL)
            return (optlist + ap->offset);

      /* Check list of options. */
      otmp.name = name;
      if ((op = bsearch(&otmp, optlist, sizeof(optlist) / sizeof(OPTLIST) - 1,
          sizeof(OPTLIST), opts_cmp)) != NULL)
            return (op);
            
      /*
       * Check to see if the name is the prefix of one (and only one)
       * option.  If so, return the option.
       */
      len = strlen(name);
      for (found = NULL, op = optlist; op->name != NULL; ++op) {
            if (op->name[0] < name[0])
                  continue;
            if (op->name[0] > name[0])
                  break;
            if (!memcmp(op->name, name, len)) {
                  if (found != NULL)
                        return (NULL);
                  found = op;
            }
      }
      return (found);
}

/* 
 * opts_nomatch --
 *    Standard nomatch error message for options.
 *
 * PUBLIC: void opts_nomatch __P((SCR *, char *));
 */
void
opts_nomatch(sp, name)
      SCR *sp;
      char *name;
{
      msgq_str(sp, M_ERR, name,
          "033|set: no %s option: 'set all' gives all option values");
}

static int
opts_abbcmp(a, b)
        const void *a, *b;
{
        return(strcmp(((OABBREV *)a)->name, ((OABBREV *)b)->name));
}

static int
opts_cmp(a, b)
        const void *a, *b;
{
        return(strcmp(((OPTLIST *)a)->name, ((OPTLIST *)b)->name));
}

/*
 * opts_copy --
 *    Copy a screen's OPTION array.
 *
 * PUBLIC: int opts_copy __P((SCR *, SCR *));
 */
int
opts_copy(orig, sp)
      SCR *orig, *sp;
{
      int cnt, rval;

      /* Copy most everything without change. */
      memcpy(sp->opts, orig->opts, sizeof(orig->opts));

      /* Copy the string edit options. */
      for (cnt = rval = 0; cnt < O_OPTIONCOUNT; ++cnt) {
            if (optlist[cnt].type != OPT_STR ||
                F_ISSET(&optlist[cnt], OPT_GLOBAL))
                  continue;
            /*
             * If never set, or already failed, NULL out the entries --
             * have to continue after failure, otherwise would have two
             * screens referencing the same memory.
             */
            if (rval || O_STR(sp, cnt) == NULL) {
                  o_set(sp, cnt, OS_NOFREE | OS_STR, NULL, 0);
                  o_set(sp, cnt, OS_DEF | OS_NOFREE | OS_STR, NULL, 0);
                  continue;
            }

            /* Copy the current string. */
            if (o_set(sp, cnt, OS_NOFREE | OS_STRDUP, O_STR(sp, cnt), 0)) {
                  o_set(sp, cnt, OS_DEF | OS_NOFREE | OS_STR, NULL, 0);
                  goto nomem;
            }

            /* Copy the default string. */
            if (O_D_STR(sp, cnt) != NULL && o_set(sp, cnt,
                OS_DEF | OS_NOFREE | OS_STRDUP, O_D_STR(sp, cnt), 0)) {
nomem:                  msgq(orig, M_SYSERR, NULL);
                  rval = 1;
            }
      }
      return (rval);
}

/*
 * opts_free --
 *    Free all option strings
 *
 * PUBLIC: void opts_free __P((SCR *));
 */
void
opts_free(sp)
      SCR *sp;
{
      int cnt;

      for (cnt = 0; cnt < O_OPTIONCOUNT; ++cnt) {
            if (optlist[cnt].type != OPT_STR ||
                F_ISSET(&optlist[cnt], OPT_GLOBAL))
                  continue;
            if (O_STR(sp, cnt) != NULL)
                  free(O_STR(sp, cnt));
            if (O_D_STR(sp, cnt) != NULL)
                  free(O_D_STR(sp, cnt));
      }
}

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