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 #ifndef NO_HTMLHELP
  15 #include <htmlhelp.h>
  16 #endif /* NO_HTMLHELP */
  17
  18 static int requested_help;
  19 static char *help_path;
  20 static int help_has_contents;
  21 #ifndef NO_HTMLHELP
  22 typedef HWND (CALLBACK *htmlhelp_t)(HWND, LPCSTR, UINT, DWORD);
  23 static char *chm_path;
  24 static htmlhelp_t htmlhelp;
  25 #endif /* NO_HTMLHELP */
  26
  27 void init_help(void)
  28 {
  29     char b[2048], *p, *q, *r;
  30     FILE *fp;
  31
  32     GetModuleFileName(NULL, b, sizeof(b) - 1);
  33     r = b;
  34     p = strrchr(b, '\\');
  35     if (p && p >= r) r = p+1;
  36     q = strrchr(b, ':');
  37     if (q && q >= r) r = q+1;
  38     strcpy(r, PUTTY_HELP_FILE);
  39     if ( (fp = fopen(b, "r")) != NULL) {
  40         help_path = dupstr(b);
  41         fclose(fp);
  42     } else
  43         help_path = NULL;
  44     strcpy(r, PUTTY_HELP_CONTENTS);
  45     if ( (fp = fopen(b, "r")) != NULL) {
  46         help_has_contents = TRUE;
  47         fclose(fp);
  48     } else
  49         help_has_contents = FALSE;
  50
  51 #ifndef NO_HTMLHELP
  52     strcpy(r, PUTTY_CHM_FILE);
  53     if ( (fp = fopen(b, "r")) != NULL) {
  54         chm_path = dupstr(b);
  55         fclose(fp);
  56     } else
  57         chm_path = NULL;
  58     if (chm_path) {
  59         HINSTANCE dllHH = LoadLibrary("hhctrl.ocx");
  60         if (dllHH) {
  61             htmlhelp = (htmlhelp_t)GetProcAddress(dllHH, "HtmlHelpA");
  62             if (!htmlhelp)
  63                 FreeLibrary(dllHH);
  64         }
  65         if (!htmlhelp)
  66             chm_path = NULL;
  67     }
  68 #endif /* NO_HTMLHELP */
  69 }
  70
  71 void shutdown_help(void)
  72 {
  73     /* Nothing to do currently.
  74      * (If we were running HTML Help single-threaded, this is where we'd
  75      * call HH_UNINITIALIZE.) */
  76 }
  77
  78 int has_help(void)
  79 {
  80     /*
  81      * FIXME: it would be nice here to disregard help_path on
  82      * platforms that didn't have WINHLP32. But that's probably
  83      * unrealistic, since even Vista will have it if the user
  84      * specifically downloads it.
  85      */
  86     return (help_path
  87 #ifndef NO_HTMLHELP
  88             || chm_path
  89 #endif /* NO_HTMLHELP */
  90            );
  91 }
  92
  93 void launch_help(HWND hwnd, const char *topic)
  94 {
  95     if (topic) {
  96         int colonpos = strcspn(topic, ":");
  97
  98 #ifndef NO_HTMLHELP
  99         if (chm_path) {
 100             char *fname;
 101             assert(topic[colonpos] != '\0');
 102             fname = dupprintf("%s::/%s.html>main", chm_path,
 103                               topic + colonpos + 1);
 104             htmlhelp(hwnd, fname, HH_DISPLAY_TOPIC, 0);
 105             sfree(fname);
 106         } else
 107 #endif /* NO_HTMLHELP */
 108         if (help_path) {
 109             char *cmd = dupprintf("JI(`',`%.*s')", colonpos, topic);
 110             WinHelp(hwnd, help_path, HELP_COMMAND, (DWORD)cmd);
 111             sfree(cmd);
 112         }
 113     } else {
 114 #ifndef NO_HTMLHELP
 115         if (chm_path) {
 116             htmlhelp(hwnd, chm_path, HH_DISPLAY_TOPIC, 0);
 117         } else
 118 #endif /* NO_HTMLHELP */
 119         if (help_path) {
 120             WinHelp(hwnd, help_path,
 121                     help_has_contents ? HELP_FINDER : HELP_CONTENTS, 0);
 122         }
 123     }
 124     requested_help = TRUE;
 125 }
 126
 127 void quit_help(HWND hwnd)
 128 {
 129     if (requested_help) {
 130 #ifndef NO_HTMLHELP
 131         if (chm_path) {
 132             htmlhelp(NULL, NULL, HH_CLOSE_ALL, 0);
 133         } else
 134 #endif /* NO_HTMLHELP */
 135         if (help_path) {
 136             WinHelp(hwnd, help_path, HELP_QUIT, 0);
 137         }
 138         requested_help = FALSE;
 139     }
 140 }