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-rwxr-xr-xopttbl.c598
1 files changed, 598 insertions, 0 deletions
diff --git a/opttbl.c b/opttbl.c
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index 0000000..0146793
--- /dev/null
+++ b/opttbl.c
@@ -0,0 +1,598 @@
+/*
+ * Copyright (C) 1984-2012 Mark Nudelman
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Less License, as specified in the README file.
+ *
+ * For more information, see the README file.
+ */
+
+
+/*
+ * The option table.
+ */
+
+#include "less.h"
+#include "option.h"
+
+/*
+ * Variables controlled by command line options.
+ */
+public int quiet; /* Should we suppress the audible bell? */
+public int how_search; /* Where should forward searches start? */
+public int top_scroll; /* Repaint screen from top?
+ (alternative is scroll from bottom) */
+public int pr_type; /* Type of prompt (short, medium, long) */
+public int bs_mode; /* How to process backspaces */
+public int know_dumb; /* Don't complain about dumb terminals */
+public int quit_at_eof; /* Quit after hitting end of file twice */
+public int quit_if_one_screen; /* Quit if EOF on first screen */
+public int squeeze; /* Squeeze multiple blank lines into one */
+public int tabstop; /* Tab settings */
+public int back_scroll; /* Repaint screen on backwards movement */
+public int forw_scroll; /* Repaint screen on forward movement */
+public int caseless; /* Do "caseless" searches */
+public int linenums; /* Use line numbers */
+public int autobuf; /* Automatically allocate buffers as needed */
+public int bufspace; /* Max buffer space per file (K) */
+public int ctldisp; /* Send control chars to screen untranslated */
+public int force_open; /* Open the file even if not regular file */
+public int swindow; /* Size of scrolling window */
+public int jump_sline; /* Screen line of "jump target" */
+public long jump_sline_fraction = -1;
+public long shift_count_fraction = -1;
+public int chopline; /* Truncate displayed lines at screen width */
+public int no_init; /* Disable sending ti/te termcap strings */
+public int no_keypad; /* Disable sending ks/ke termcap strings */
+public int twiddle; /* Show tildes after EOF */
+public int show_attn; /* Hilite first unread line */
+public int shift_count; /* Number of positions to shift horizontally */
+public int status_col; /* Display a status column */
+public int use_lessopen; /* Use the LESSOPEN filter */
+public int quit_on_intr; /* Quit on interrupt */
+public int follow_mode; /* F cmd Follows file desc or file name? */
+public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
+#if HILITE_SEARCH
+public int hilite_search; /* Highlight matched search patterns? */
+#endif
+
+public int less_is_more = 0; /* Make compatible with POSIX more */
+
+/*
+ * Long option names.
+ */
+static struct optname a_optname = { "search-skip-screen", NULL };
+static struct optname b_optname = { "buffers", NULL };
+static struct optname B__optname = { "auto-buffers", NULL };
+static struct optname c_optname = { "clear-screen", NULL };
+static struct optname d_optname = { "dumb", NULL };
+#if MSDOS_COMPILER
+static struct optname D__optname = { "color", NULL };
+#endif
+static struct optname e_optname = { "quit-at-eof", NULL };
+static struct optname f_optname = { "force", NULL };
+static struct optname F__optname = { "quit-if-one-screen", NULL };
+#if HILITE_SEARCH
+static struct optname g_optname = { "hilite-search", NULL };
+#endif
+static struct optname h_optname = { "max-back-scroll", NULL };
+static struct optname i_optname = { "ignore-case", NULL };
+static struct optname j_optname = { "jump-target", NULL };
+static struct optname J__optname = { "status-column", NULL };
+#if USERFILE
+static struct optname k_optname = { "lesskey-file", NULL };
+#endif
+static struct optname K__optname = { "quit-on-intr", NULL };
+static struct optname L__optname = { "no-lessopen", NULL };
+static struct optname m_optname = { "long-prompt", NULL };
+static struct optname n_optname = { "line-numbers", NULL };
+#if LOGFILE
+static struct optname o_optname = { "log-file", NULL };
+static struct optname O__optname = { "LOG-FILE", NULL };
+#endif
+static struct optname p_optname = { "pattern", NULL };
+static struct optname P__optname = { "prompt", NULL };
+static struct optname q2_optname = { "silent", NULL };
+static struct optname q_optname = { "quiet", &q2_optname };
+static struct optname r_optname = { "raw-control-chars", NULL };
+static struct optname s_optname = { "squeeze-blank-lines", NULL };
+static struct optname S__optname = { "chop-long-lines", NULL };
+#if TAGS
+static struct optname t_optname = { "tag", NULL };
+static struct optname T__optname = { "tag-file", NULL };
+#endif
+static struct optname u_optname = { "underline-special", NULL };
+static struct optname V__optname = { "version", NULL };
+static struct optname w_optname = { "hilite-unread", NULL };
+static struct optname x_optname = { "tabs", NULL };
+static struct optname X__optname = { "no-init", NULL };
+static struct optname y_optname = { "max-forw-scroll", NULL };
+static struct optname z_optname = { "window", NULL };
+static struct optname quote_optname = { "quotes", NULL };
+static struct optname tilde_optname = { "tilde", NULL };
+static struct optname query_optname = { "help", NULL };
+static struct optname pound_optname = { "shift", NULL };
+static struct optname keypad_optname = { "no-keypad", NULL };
+static struct optname oldbot_optname = { "old-bot", NULL };
+static struct optname follow_optname = { "follow-name", NULL };
+
+
+/*
+ * Table of all options and their semantics.
+ *
+ * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
+ * the description of the option when set to 0, 1 or 2, respectively.
+ * For NUMBER options, odesc[0] is the prompt to use when entering
+ * a new value, and odesc[1] is the description, which should contain
+ * one %d which is replaced by the value of the number.
+ * For STRING options, odesc[0] is the prompt to use when entering
+ * a new value, and odesc[1], if not NULL, is the set of characters
+ * that are valid in the string.
+ */
+static struct loption option[] =
+{
+ { 'a', &a_optname,
+ TRIPLE, OPT_ONPLUS, &how_search, NULL,
+ {
+ "Search includes displayed screen",
+ "Search skips displayed screen",
+ "Search includes all of displayed screen"
+ }
+ },
+
+ { 'b', &b_optname,
+ NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
+ {
+ "Max buffer space per file (K): ",
+ "Max buffer space per file: %dK",
+ NULL
+ }
+ },
+ { 'B', &B__optname,
+ BOOL, OPT_ON, &autobuf, NULL,
+ {
+ "Don't automatically allocate buffers",
+ "Automatically allocate buffers when needed",
+ NULL
+ }
+ },
+ { 'c', &c_optname,
+ TRIPLE, OPT_OFF, &top_scroll, NULL,
+ {
+ "Repaint by scrolling from bottom of screen",
+ "Repaint by painting from top of screen",
+ "Repaint by painting from top of screen"
+ }
+ },
+ { 'd', &d_optname,
+ BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
+ {
+ "Assume intelligent terminal",
+ "Assume dumb terminal",
+ NULL
+ }
+ },
+#if MSDOS_COMPILER
+ { 'D', &D__optname,
+ STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
+ {
+ "color desc: ",
+ "Ddknsu0123456789.",
+ NULL
+ }
+ },
+#endif
+ { 'e', &e_optname,
+ TRIPLE, OPT_OFF, &quit_at_eof, NULL,
+ {
+ "Don't quit at end-of-file",
+ "Quit at end-of-file",
+ "Quit immediately at end-of-file"
+ }
+ },
+ { 'f', &f_optname,
+ BOOL, OPT_OFF, &force_open, NULL,
+ {
+ "Open only regular files",
+ "Open even non-regular files",
+ NULL
+ }
+ },
+ { 'F', &F__optname,
+ BOOL, OPT_OFF, &quit_if_one_screen, NULL,
+ {
+ "Don't quit if end-of-file on first screen",
+ "Quit if end-of-file on first screen",
+ NULL
+ }
+ },
+#if HILITE_SEARCH
+ { 'g', &g_optname,
+ TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
+ {
+ "Don't highlight search matches",
+ "Highlight matches for previous search only",
+ "Highlight all matches for previous search pattern",
+ }
+ },
+#endif
+ { 'h', &h_optname,
+ NUMBER, -1, &back_scroll, NULL,
+ {
+ "Backwards scroll limit: ",
+ "Backwards scroll limit is %d lines",
+ NULL
+ }
+ },
+ { 'i', &i_optname,
+ TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
+ {
+ "Case is significant in searches",
+ "Ignore case in searches",
+ "Ignore case in searches and in patterns"
+ }
+ },
+ { 'j', &j_optname,
+ STRING, 0, NULL, opt_j,
+ {
+ "Target line: ",
+ "0123456789.-",
+ NULL
+ }
+ },
+ { 'J', &J__optname,
+ BOOL|REPAINT, OPT_OFF, &status_col, NULL,
+ {
+ "Don't display a status column",
+ "Display a status column",
+ NULL
+ }
+ },
+#if USERFILE
+ { 'k', &k_optname,
+ STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
+ { NULL, NULL, NULL }
+ },
+#endif
+ { 'K', &K__optname,
+ BOOL, OPT_OFF, &quit_on_intr, NULL,
+ {
+ "Interrupt (ctrl-C) returns to prompt",
+ "Interrupt (ctrl-C) exits less",
+ NULL
+ }
+ },
+ { 'L', &L__optname,
+ BOOL, OPT_ON, &use_lessopen, NULL,
+ {
+ "Don't use the LESSOPEN filter",
+ "Use the LESSOPEN filter",
+ NULL
+ }
+ },
+ { 'm', &m_optname,
+ TRIPLE, OPT_OFF, &pr_type, NULL,
+ {
+ "Short prompt",
+ "Medium prompt",
+ "Long prompt"
+ }
+ },
+ { 'n', &n_optname,
+ TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
+ {
+ "Don't use line numbers",
+ "Use line numbers",
+ "Constantly display line numbers"
+ }
+ },
+#if LOGFILE
+ { 'o', &o_optname,
+ STRING, 0, NULL, opt_o,
+ { "log file: ", NULL, NULL }
+ },
+ { 'O', &O__optname,
+ STRING, 0, NULL, opt__O,
+ { "Log file: ", NULL, NULL }
+ },
+#endif
+ { 'p', &p_optname,
+ STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
+ { NULL, NULL, NULL }
+ },
+ { 'P', &P__optname,
+ STRING, 0, NULL, opt__P,
+ { "prompt: ", NULL, NULL }
+ },
+ { 'q', &q_optname,
+ TRIPLE, OPT_OFF, &quiet, NULL,
+ {
+ "Ring the bell for errors AND at eof/bof",
+ "Ring the bell for errors but not at eof/bof",
+ "Never ring the bell"
+ }
+ },
+ { 'r', &r_optname,
+ TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
+ {
+ "Display control characters as ^X",
+ "Display control characters directly",
+ "Display control characters directly, processing ANSI sequences"
+ }
+ },
+ { 's', &s_optname,
+ BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
+ {
+ "Display all blank lines",
+ "Squeeze multiple blank lines",
+ NULL
+ }
+ },
+ { 'S', &S__optname,
+ BOOL|REPAINT, OPT_OFF, &chopline, NULL,
+ {
+ "Fold long lines",
+ "Chop long lines",
+ NULL
+ }
+ },
+#if TAGS
+ { 't', &t_optname,
+ STRING|NO_QUERY, 0, NULL, opt_t,
+ { "tag: ", NULL, NULL }
+ },
+ { 'T', &T__optname,
+ STRING, 0, NULL, opt__T,
+ { "tags file: ", NULL, NULL }
+ },
+#endif
+ { 'u', &u_optname,
+ TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
+ {
+ "Display underlined text in underline mode",
+ "Backspaces cause overstrike",
+ "Print backspace as ^H"
+ }
+ },
+ { 'V', &V__optname,
+ NOVAR, 0, NULL, opt__V,
+ { NULL, NULL, NULL }
+ },
+ { 'w', &w_optname,
+ TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
+ {
+ "Don't highlight first unread line",
+ "Highlight first unread line after forward-screen",
+ "Highlight first unread line after any forward movement",
+ }
+ },
+ { 'x', &x_optname,
+ STRING|REPAINT, 0, NULL, opt_x,
+ {
+ "Tab stops: ",
+ "0123456789,",
+ NULL
+ }
+ },
+ { 'X', &X__optname,
+ BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
+ {
+ "Send init/deinit strings to terminal",
+ "Don't use init/deinit strings",
+ NULL
+ }
+ },
+ { 'y', &y_optname,
+ NUMBER, -1, &forw_scroll, NULL,
+ {
+ "Forward scroll limit: ",
+ "Forward scroll limit is %d lines",
+ NULL
+ }
+ },
+ { 'z', &z_optname,
+ NUMBER, -1, &swindow, NULL,
+ {
+ "Scroll window size: ",
+ "Scroll window size is %d lines",
+ NULL
+ }
+ },
+ { '"', &quote_optname,
+ STRING, 0, NULL, opt_quote,
+ { "quotes: ", NULL, NULL }
+ },
+ { '~', &tilde_optname,
+ BOOL|REPAINT, OPT_ON, &twiddle, NULL,
+ {
+ "Don't show tildes after end of file",
+ "Show tildes after end of file",
+ NULL
+ }
+ },
+ { '?', &query_optname,
+ NOVAR, 0, NULL, opt_query,
+ { NULL, NULL, NULL }
+ },
+ { '#', &pound_optname,
+ STRING, 0, NULL, opt_shift,
+ {
+ "Horizontal shift: ",
+ "0123456789.",
+ NULL
+ }
+ },
+ { OLETTER_NONE, &keypad_optname,
+ BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
+ {
+ "Use keypad mode",
+ "Don't use keypad mode",
+ NULL
+ }
+ },
+ { OLETTER_NONE, &oldbot_optname,
+ BOOL, OPT_OFF, &oldbot, NULL,
+ {
+ "Use new bottom of screen behavior",
+ "Use old bottom of screen behavior",
+ NULL
+ }
+ },
+ { OLETTER_NONE, &follow_optname,
+ BOOL, FOLLOW_DESC, &follow_mode, NULL,
+ {
+ "F command follows file descriptor",
+ "F command follows file name",
+ NULL
+ }
+ },
+ { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
+};
+
+
+/*
+ * Initialize each option to its default value.
+ */
+ public void
+init_option()
+{
+ register struct loption *o;
+ char *p;
+
+ p = lgetenv("LESS_IS_MORE");
+ if (p != NULL && *p != '\0')
+ less_is_more = 1;
+
+ for (o = option; o->oletter != '\0'; o++)
+ {
+ /*
+ * Set each variable to its default.
+ */
+ if (o->ovar != NULL)
+ *(o->ovar) = o->odefault;
+ if (o->otype & INIT_HANDLER)
+ (*(o->ofunc))(INIT, (char *) NULL);
+ }
+}
+
+/*
+ * Find an option in the option table, given its option letter.
+ */
+ public struct loption *
+findopt(c)
+ int c;
+{
+ register struct loption *o;
+
+ for (o = option; o->oletter != '\0'; o++)
+ {
+ if (o->oletter == c)
+ return (o);
+ if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
+ return (o);
+ }
+ return (NULL);
+}
+
+/*
+ *
+ */
+ static int
+is_optchar(c)
+ char c;
+{
+ if (ASCII_IS_UPPER(c))
+ return 1;
+ if (ASCII_IS_LOWER(c))
+ return 1;
+ if (c == '-')
+ return 1;
+ return 0;
+}
+
+/*
+ * Find an option in the option table, given its option name.
+ * p_optname is the (possibly partial) name to look for, and
+ * is updated to point after the matched name.
+ * p_oname if non-NULL is set to point to the full option name.
+ */
+ public struct loption *
+findopt_name(p_optname, p_oname, p_err)
+ char **p_optname;
+ char **p_oname;
+ int *p_err;
+{
+ char *optname = *p_optname;
+ register struct loption *o;
+ register struct optname *oname;
+ register int len;
+ int uppercase;
+ struct loption *maxo = NULL;
+ struct optname *maxoname = NULL;
+ int maxlen = 0;
+ int ambig = 0;
+ int exact = 0;
+
+ /*
+ * Check all options.
+ */
+ for (o = option; o->oletter != '\0'; o++)
+ {
+ /*
+ * Check all names for this option.
+ */
+ for (oname = o->onames; oname != NULL; oname = oname->onext)
+ {
+ /*
+ * Try normal match first (uppercase == 0),
+ * then, then if it's a TRIPLE option,
+ * try uppercase match (uppercase == 1).
+ */
+ for (uppercase = 0; uppercase <= 1; uppercase++)
+ {
+ len = sprefix(optname, oname->oname, uppercase);
+ if (len <= 0 || is_optchar(optname[len]))
+ {
+ /*
+ * We didn't use all of the option name.
+ */
+ continue;
+ }
+ if (!exact && len == maxlen)
+ /*
+ * Already had a partial match,
+ * and now there's another one that
+ * matches the same length.
+ */
+ ambig = 1;
+ else if (len > maxlen)
+ {
+ /*
+ * Found a better match than
+ * the one we had.
+ */
+ maxo = o;
+ maxoname = oname;
+ maxlen = len;
+ ambig = 0;
+ exact = (len == (int)strlen(oname->oname));
+ }
+ if (!(o->otype & TRIPLE))
+ break;
+ }
+ }
+ }
+ if (ambig)
+ {
+ /*
+ * Name matched more than one option.
+ */
+ if (p_err != NULL)
+ *p_err = OPT_AMBIG;
+ return (NULL);
+ }
+ *p_optname = optname + maxlen;
+ if (p_oname != NULL)
+ *p_oname = maxoname == NULL ? NULL : maxoname->oname;
+ return (maxo);
+}
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