| 1 | /* Copyright (c) 1985 Ceriel J.H. Jacobs */
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| 2 |
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| 3 | #ifndef lint
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| 4 | static char rcsid[] = "$Header: /cvsup/minix/src/commands/yap/help.c,v 1.1.1.1 2005/04/21 14:55:39 beng Exp $";
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| 5 | #endif
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| 6 |
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| 7 | #define _HELP_
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| 8 | #include "in_all.h"
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| 9 | #include "help.h"
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| 10 | #include "machine.h"
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| 11 | #include "commands.h"
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| 12 | #include "keys.h"
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| 13 | #include "output.h"
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| 14 | #include "prompt.h"
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| 15 | #include "main.h"
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| 16 | #include "display.h"
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| 17 | #include "term.h"
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| 18 | #include "options.h"
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| 19 |
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| 20 | static int h_cnt; /* Count # of lines */
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| 21 | static struct state *origin; /* Keep track of startstate */
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| 22 |
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| 23 | /*
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| 24 | * Print a key sequence.
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| 25 | * We arrived at an endstate. The s_next link in the state structure now
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| 26 | * leads us from "origin" to the current state, so that we can print the key
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| 27 | * sequence easily.
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| 28 | */
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| 29 |
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| 30 | STATIC VOID
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| 31 | pr_comm() {
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| 32 | register struct state *p = origin;
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| 33 | register char *pb;
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| 34 | register int c;
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| 35 | char buf[30];
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| 36 | register int i = 0; /* How many characters printed? */
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| 37 |
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| 38 | pb = buf;
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| 39 | for (;;) {
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| 40 | c = p->s_char & 0177;
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| 41 | if (c < ' ' || c == 0177) {
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| 42 | /*
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| 43 | * Will take an extra position
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| 44 | */
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| 45 | i++;
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| 46 | }
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| 47 | *pb++ = c;
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| 48 | i++;
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| 49 | if (!p->s_match) break;
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| 50 | p = p->s_next;
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| 51 | }
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| 52 | do {
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| 53 | *pb++ = ' ';
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| 54 | } while (++i < 12);
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| 55 | *pb = 0;
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| 56 | cputline(buf);
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| 57 | }
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| 58 |
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| 59 | /*
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| 60 | * Print out a description of the keymap. This is done, by temporarily using
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| 61 | * the s_next field in the state structure indicate the state matching the
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| 62 | * next character, so that we can walk from "origin" to an endstate.
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| 63 | */
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| 64 |
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| 65 | STATIC VOID
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| 66 | pr_mach(currstate, back) register struct state *currstate, *back; {
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| 67 | struct state *save;
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| 68 |
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| 69 | while (currstate) {
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| 70 | if (interrupt) break;
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| 71 | if (back) {
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| 72 | save = back->s_next; /* Save original link */
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| 73 | back->s_next = currstate;
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| 74 | }
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| 75 | if (!currstate->s_match) {
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| 76 | /*
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| 77 | * End state, print command
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| 78 | */
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| 79 | pr_comm();
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| 80 | putline(commands[currstate->s_cnt].c_descr);
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| 81 | putline("\r\n");
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| 82 | if (++h_cnt >= maxpagesize) {
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| 83 | ret_to_continue();
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| 84 | h_cnt = 0;
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| 85 | }
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| 86 | }
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| 87 | else pr_mach(currstate->s_match, currstate);
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| 88 | currstate = currstate->s_next;
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| 89 | if (back) back->s_next = save; /* restore */
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| 90 | else origin = currstate;
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | /*ARGSUSED*/
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| 95 | int
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| 96 | do_help(i) long i; { /* The help command */
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| 97 |
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| 98 | startcomm = 0;
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| 99 | h_cnt = 2;
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| 100 | putline("\r\nSummary of yap commands:\r\n");
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| 101 | origin = currmap->k_mach;
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| 102 | pr_mach(currmap->k_mach, (struct state *) 0);
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| 103 | if (h_cnt) {
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| 104 | ret_to_continue();
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| 105 | }
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| 106 | if (!hardcopy && scr_info.currentpos) redraw(1);
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| 107 | }
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