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 #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 DWORD html_help_cookie;
  25 static htmlhelp_t htmlhelp;
  26 #endif /* NO_HTMLHELP */
  27
  28 void init_help(void)
  29 {
  30     char b[2048], *p, *q, *r;
  31     FILE *fp;
  32
  33     GetModuleFileName(NULL, b, sizeof(b) - 1);
  34     r = b;
  35     p = strrchr(b, '\\');
  36     if (p && p >= r) r = p+1;
  37     q = strrchr(b, ':');
  38     if (q && q >= r) r = q+1;
  39     strcpy(r, PUTTY_HELP_FILE);
  40     if ( (fp = fopen(b, "r")) != NULL) {
  41         help_path = dupstr(b);
  42         fclose(fp);
  43     } else
  44         help_path = NULL;
  45     strcpy(r, PUTTY_HELP_CONTENTS);
  46     if ( (fp = fopen(b, "r")) != NULL) {
  47         help_has_contents = TRUE;
  48         fclose(fp);
  49     } else
  50         help_has_contents = FALSE;
  51
  52 #ifndef NO_HTMLHELP
  53     strcpy(r, PUTTY_CHM_FILE);
  54     if ( (fp = fopen(b, "r")) != NULL) {
  55         chm_path = dupstr(b);
  56         fclose(fp);
  57     } else
  58         chm_path = NULL;
  59     if (chm_path) {
  60         HINSTANCE dllHH = LoadLibrary("hhctrl.ocx");
  61         if (dllHH) {
  62             htmlhelp = (htmlhelp_t)GetProcAddress(dllHH, "HtmlHelpA");
  63             if (!htmlhelp)
  64                 FreeLibrary(dllHH);
  65         }
  66         if (htmlhelp)
  67             htmlhelp(NULL, NULL, HH_INITIALIZE, (DWORD)&html_help_cookie);
  68         else
  69             chm_path = NULL;
  70     }
  71 #endif /* NO_HTMLHELP */
  72 }
  73
  74 void shutdown_help(void)
  75 {
  76 #ifndef NO_HTMLHELP
  77     if (chm_path)
  78         htmlhelp(NULL, NULL, HH_UNINITIALIZE, html_help_cookie);
  79 #endif /* NO_HTMLHELP */
  80 }
  81
  82 int has_help(void)
  83 {
  84     /*
  85      * FIXME: it would be nice here to disregard help_path on
  86      * platforms that didn't have WINHLP32. But that's probably
  87      * unrealistic, since even Vista will have it if the user
  88      * specifically downloads it.
  89      */
  90     return (help_path
  91 #ifndef NO_HTMLHELP
  92             || chm_path
  93 #endif /* NO_HTMLHELP */
  94            );
  95 }
  96
  97 void launch_help(HWND hwnd, const char *topic)
  98 {
  99     if (topic) {
 100         int colonpos = strcspn(topic, ":");
 101
 102 #ifndef NO_HTMLHELP
 103         if (chm_path) {
 104             char *fname;
 105             assert(topic[colonpos] != '\0');
 106             fname = dupprintf("%s::/%s.html>main", chm_path,
 107                               topic + colonpos + 1);
 108             htmlhelp(hwnd, fname, HH_DISPLAY_TOPIC, 0);
 109             sfree(fname);
 110         } else
 111 #endif /* NO_HTMLHELP */
 112         if (help_path) {
 113             char *cmd = dupprintf("JI(`',`%.*s')", colonpos, topic);
 114             WinHelp(hwnd, help_path, HELP_COMMAND, (DWORD)cmd);
 115             sfree(cmd);
 116         }
 117     } else {
 118 #ifndef NO_HTMLHELP
 119         if (chm_path) {
 120             htmlhelp(hwnd, chm_path, HH_DISPLAY_TOPIC, 0);
 121         } else
 122 #endif /* NO_HTMLHELP */
 123         if (help_path) {
 124             WinHelp(hwnd, help_path,
 125                     help_has_contents ? HELP_FINDER : HELP_CONTENTS, 0);
 126         }
 127     }
 128     requested_help = TRUE;
 129 }
 130
 131 void quit_help(HWND hwnd)
 132 {
 133     if (requested_help) {
 134 #ifndef NO_HTMLHELP
 135         if (chm_path) {
 136             htmlhelp(NULL, NULL, HH_CLOSE_ALL, 0);
 137         } else
 138 #endif /* NO_HTMLHELP */
 139         if (help_path) {
 140             WinHelp(hwnd, help_path, HELP_QUIT, 0);
 141         }
 142         requested_help = FALSE;
 143     }
 144 }