git.distorted.org.uk Git - u/mdw/putty/blob - windows/winhelp.c

   1 /*
   2  * winhelp.c: centralised functions to launch Windows help files,
   3  * and to decide whether to use .HLP or .CHM help in any given
   4  * situation.
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <assert.h>
  11
  12 #include "putty.h"
  13
  14 #include <htmlhelp.h>
  15
  16 typedef HWND (CALLBACK *htmlhelp_t)(HWND, LPCSTR, UINT, DWORD);
  17
  18 static char *help_path, *chm_path;
  19 static int help_has_contents;
  20 static int requested_help;
  21 static DWORD html_help_cookie;
  22 static htmlhelp_t htmlhelp;
  23
  24 void init_help(void)
  25 {
  26     char b[2048], *p, *q, *r;
  27     FILE *fp;
  28
  29     GetModuleFileName(NULL, b, sizeof(b) - 1);
  30     r = b;
  31     p = strrchr(b, '\\');
  32     if (p && p >= r) r = p+1;
  33     q = strrchr(b, ':');
  34     if (q && q >= r) r = q+1;
  35     strcpy(r, PUTTY_HELP_FILE);
  36     if ( (fp = fopen(b, "r")) != NULL) {
  37         help_path = dupstr(b);
  38         fclose(fp);
  39     } else
  40         help_path = NULL;
  41     strcpy(r, PUTTY_HELP_CONTENTS);
  42     if ( (fp = fopen(b, "r")) != NULL) {
  43         help_has_contents = TRUE;
  44         fclose(fp);
  45     } else
  46         help_has_contents = FALSE;
  47
  48     strcpy(r, PUTTY_CHM_FILE);
  49     if ( (fp = fopen(b, "r")) != NULL) {
  50         chm_path = dupstr(b);
  51         fclose(fp);
  52     } else
  53         chm_path = NULL;
  54     if (chm_path) {
  55         HINSTANCE dllHH = LoadLibrary("hhctrl.ocx");
  56         if (dllHH) {
  57             htmlhelp = (htmlhelp_t)GetProcAddress(dllHH, "HtmlHelpA");
  58             if (!htmlhelp)
  59                 FreeLibrary(dllHH);
  60         }
  61         if (htmlhelp)
  62             htmlhelp(NULL, NULL, HH_INITIALIZE, (DWORD)&html_help_cookie);
  63         else
  64             chm_path = NULL;
  65     }
  66 }
  67
  68 void shutdown_help(void)
  69 {
  70     if (chm_path)
  71         htmlhelp(NULL, NULL, HH_UNINITIALIZE, html_help_cookie);
  72 }
  73
  74 int has_help(void)
  75 {
  76     /*
  77      * FIXME: it would be nice here to disregard help_path on
  78      * platforms that didn't have WINHLP32. But that's probably
  79      * unrealistic, since even Vista will have it if the user
  80      * specifically downloads it.
  81      */
  82     return (help_path || chm_path);
  83 }
  84
  85 void launch_help(HWND hwnd, const char *topic)
  86 {
  87     if (topic) {
  88         int colonpos = strcspn(topic, ":");
  89
  90         if (chm_path) {
  91             char *fname;
  92             assert(topic[colonpos] != '\0');
  93             fname = dupprintf("%s::/%s.html>main", chm_path,
  94                               topic + colonpos + 1);
  95             htmlhelp(hwnd, fname, HH_DISPLAY_TOPIC, 0);
  96             sfree(fname);
  97         } else if (help_path) {
  98             char *cmd = dupprintf("JI(`',`%.*s')", colonpos, topic);
  99             WinHelp(hwnd, help_path, HELP_COMMAND, (DWORD)cmd);
 100             sfree(cmd);
 101         }
 102     } else {
 103         if (chm_path) {
 104             htmlhelp(hwnd, chm_path, HH_DISPLAY_TOPIC, 0);
 105         } else if (help_path) {
 106             WinHelp(hwnd, help_path,
 107                     help_has_contents ? HELP_FINDER : HELP_CONTENTS, 0);
 108         }
 109     }
 110     requested_help = TRUE;
 111 }
 112
 113 void quit_help(HWND hwnd)
 114 {
 115     if (requested_help) {
 116         if (chm_path) {
 117             htmlhelp(NULL, NULL, HH_CLOSE_ALL, 0);
 118         } else if (help_path) {
 119             WinHelp(hwnd, help_path, HELP_QUIT, 0);
 120         }
 121         requested_help = FALSE;
 122     }
 123 }