More work on mapping OS/2 drive letters to the Unix filesystem.

icculus · Jul 10, 2018 · 0894e3d · 0894e3d
1 parent 8c8f416
commit 0894e3d
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Showing 3 changed files with 167 additions and 39 deletions.
diff --git a/lib2ine.c b/lib2ine.c
@@ -370,46 +370,54 @@ static int cfgIsSymChar(const int ch)
     return ((ch == '_') || ((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z')));
 }
 
-static void cfgProcessDrive(const char *fname, const int lineno, const char *var, const char *val)
+static void cfgProcessBoolString(const char *fname, const int lineno, int *output, const char *val)
+{
+    static const char *y[] = { "1", "yes", "y", "true", "t", "on" };
+    static const char *n[] = { "0", "no", "n", "false", "f", "off" };
+    int i;
+    for (i = 0; i < (sizeof (y) / sizeof (y[0])); i++) {
+        if (strcasecmp(val, y[i]) == 0) { *output = 1; return; }
+        if (strcasecmp(val, n[i]) == 0) { *output = 0; return; }
+    }
+    cfgWarn(fname, lineno, "\"%s\" is not valid for this setting. Try 1 or 0.", val);
+}
+
+static void cfgProcessMountPoint(const char *fname, const int lineno, const char *var, const char *val)
 {
     char letter = var[0];
     if ((letter >= 'a') && (letter <= 'z')) {
         letter -= 'a' - 'A';
     }
 
     if ((letter < 'A') || (letter > 'Z') || (var[1] != '\0')) {
-        cfgWarn(fname, lineno, "Invalid drive \"%s\" (must be between 'A' and 'Z')", var);
+        cfgWarn(fname, lineno, "Invalid disk \"%s\" (must be between 'A' and 'Z')", var);
         return;
     }
 
     const int idx = (int) (letter - 'A');
-    free(GLoaderState.drives[idx]);  // in case we're overriding.
-    GLoaderState.drives[idx] = NULL;
+    free(GLoaderState.disks[idx]);  // in case we're overriding.
+    GLoaderState.disks[idx] = NULL;
 
     if (*val != '\0') {  // val=="" means don't mount
+        const size_t vallen = strlen(val);
         struct stat statbuf;
         if (stat(val, &statbuf) == -1) {
             cfgWarn(fname, lineno, "Path \"%s\" for drive %c:\\ isn't accessible: %s", val, letter, strerror(errno));
         } else if (!S_ISDIR(statbuf.st_mode)) {
             cfgWarn(fname, lineno, "Path \"%s\" for drive %c:\\ isn't a directory", val, letter);
-        } else if ((GLoaderState.drives[idx] = strdup(val)) == NULL) {
+        } else if ((GLoaderState.disks[idx] = (char *) malloc(vallen + 2)) == NULL) {
             cfgWarn(fname, lineno, "Out of memory!");
+        } else {
+            char *ptr = GLoaderState.disks[idx];
+            strcpy(ptr, val);
+            if (ptr[vallen - 1] != '/') {
+                ptr[vallen] = '/';
+                ptr[vallen+1] = '\0';
+            }
         }
     }
 }
 
-static void cfgProcessBoolString(const char *fname, const int lineno, int *output, const char *val)
-{
-    static const char *y[] = { "1", "yes", "y", "true", "t", "on" };
-    static const char *n[] = { "0", "no", "n", "false", "f", "off" };
-    int i;
-    for (i = 0; i < (sizeof (y) / sizeof (y[0])); i++) {
-        if (strcasecmp(val, y[i]) == 0) { *output = 1; return; }
-        if (strcasecmp(val, n[i]) == 0) { *output = 0; return; }
-    }
-    cfgWarn(fname, lineno, "\"%s\" is not valid for this setting. Try 1 or 0.", val);
-}
-
 static void cfgProcessSystem(const char *fname, const int lineno, const char *var, const char *val)
 {
     if (strcmp(var, "trace_native") == 0) {
@@ -426,8 +434,8 @@ static void cfgProcessLine(const char *fname, const int lineno, const char *cate
     //printf("CFG: process line cat=%s var=%s, val=%s\n", category, var, val);
     if ((*category == '\0') || (*var == '\0')) {
         cfgWarn(fname, lineno, "Invalid configuration line");
-    } else if (strcmp(category, "drive") == 0) {
-        cfgProcessDrive(fname, lineno, var, val);
+    } else if (strcmp(category, "mountpoint") == 0) {
+        cfgProcessMountPoint(fname, lineno, var, val);
     // eventually will map COM1, LPT1, NUL, etc.
     //} else if (strcmp(category, "device") == 0) {
     //    cfgProcessDevice(fname, lineno, var, val);
@@ -533,6 +541,105 @@ static void cfgLoadFiles(void)
     }
 }
 
+static void prepOs2Drives(void)
+{
+    const int drive_c = 'C' - 'A';
+    const int total = (sizeof (GLoaderState.disks) / sizeof (GLoaderState.disks[0]));
+    uint32 diskmap = 0;
+    int lowestmounted = 0;
+    int lowestcwd = 0;
+    int i;
+
+    FIXME("need to pass current dirs and disks to OS/2 subprocesses");
+
+    char *cwd = getcwd(NULL, 0);
+    char *rp = cwd ? realpath(cwd, NULL) : NULL;  // in case there's a symlink in there.
+    if ((cwd == NULL) || (rp == NULL)) {
+        fprintf(stderr, "Can't get cwd (%s), defaulting to \"/\".\n", strerror(errno));
+        rp = strdup("/");
+        chdir(rp);
+    }
+
+    free(cwd);
+    cwd = rp;
+
+    for (i = 0; i < total; i++) {
+        if (GLoaderState.disks[i] == NULL) {
+            continue;
+        }
+
+        rp = realpath(GLoaderState.disks[i], NULL);
+        if (rp == NULL) {
+            fprintf(stderr, "Can't realpath \"%s\" (%s), not mounting %c:\\\n", GLoaderState.disks[i], strerror(errno), i + 'A');
+            free(GLoaderState.disks[i]);
+            GLoaderState.disks[i] = NULL;
+            continue;
+        }
+
+        if (lowestmounted < 3) {
+            lowestmounted = i + 1;
+        }
+
+        diskmap |= (1 << i);
+
+        const size_t rplen = strlen(rp);
+        assert(rplen > 0);
+        if ((strncmp(rp, cwd, rplen) == 0) && ((rp[rplen-1] == '/') || (cwd[rplen] == '/') || (cwd[rplen] == '\0'))) {
+            // our cwd is under this mount point!
+            const char *d = cwd + rplen;
+            GLoaderState.current_dir[i] = strdup((*d == '/') ? d + 1 : d);
+            char *ptr = GLoaderState.current_dir[i];
+            while (*ptr) {  // make current dir an OS/2-style relative path.
+                if (*ptr == '/') {
+                    *ptr = '\\';
+                }
+                ptr++;
+            }
+
+            if (lowestcwd < 3) {
+                lowestcwd = i + 1;
+            }
+        } else {
+            // current directory isn't under this mount point, just make it the root.
+            GLoaderState.current_dir[i] = strdup("");
+        }
+        free(rp);
+    }
+
+    if (!lowestmounted) {
+        // if no disks are mapped at all, just map the Unix root filesystem to C:
+        GLoaderState.disks[drive_c] = strdup("/");
+        char *ptr = strdup(cwd + 1);  // skip the initial '/'
+        GLoaderState.current_dir[drive_c] = ptr;
+        while (*ptr) {  // make current dir an OS/2-style relative path.
+            if (*ptr == '/') {
+                *ptr = '\\';
+            }
+            ptr++;
+        }
+        GLoaderState.current_disk = drive_c + 1;
+    } else if (!lowestcwd) {
+        // your actual cwd isn't under any mountpoint, so pick the first mounted drive we
+        //  saw, starting with C:\, unless we only have A:\ or B:\, then use one of those.
+        GLoaderState.current_disk = lowestmounted;
+    } else {
+        GLoaderState.current_disk = lowestcwd;
+    }
+
+    free(cwd);
+
+    GLoaderState.diskmap = diskmap;
+
+    #if 0
+    fprintf(stderr, "OS/2 disks:\n");
+    for (i = 0; i < total; i++) {
+        if (GLoaderState.disks[i] == NULL) continue;
+        fprintf(stderr, "  %c: -> mountpoint='%s' cwd='%s' current=%d\n", 'A' + i, GLoaderState.disks[i], GLoaderState.current_dir[i], GLoaderState.current_disk == (i+1));
+    }
+    fprintf(stderr, "\n");
+    #endif
+}
+
 LX_NATIVE_CONSTRUCTOR(lib2ine)
 {
     if (pthread_key_create(&tlskey, NULL) != 0) {
@@ -557,6 +664,7 @@ LX_NATIVE_CONSTRUCTOR(lib2ine)
     GLoaderState.terminate = terminate_lib2ine;
 
     cfgLoadFiles();
+    prepOs2Drives();
 
     struct rlimit rlim;
     if (getrlimit(RLIMIT_STACK, &rlim) == -1) {
@@ -583,9 +691,9 @@ LX_NATIVE_CONSTRUCTOR(lib2ine)
 
 LX_NATIVE_DESTRUCTOR(lib2ine)
 {
-    int i;
-    for (i = 0; i < (sizeof (GLoaderState.drives) / sizeof (GLoaderState.drives[0])); i++) {
-        free(GLoaderState.drives[i]);
+    for (int i = 0; i < (sizeof (GLoaderState.disks) / sizeof (GLoaderState.disks[0])); i++) {
+        free(GLoaderState.disks[i]);
+        GLoaderState.disks[i] = NULL;
     }
     free(GLoaderState.pib.pib_pchenv);
     memset(&GLoaderState, '\0', sizeof (GLoaderState));

diff --git a/lib2ine.h b/lib2ine.h
@@ -288,7 +288,10 @@ typedef struct LxLoaderState
     int running;
     int trace_native;
     int trace_events;
-    char *drives[26];  // mount points, A: through Z: ... NULL if unmounted.
+    char *disks[26];  // mount points, A: through Z: ... NULL if unmounted.
+    char *current_dir[26];  // current directory, per-disk, A: through Z: ... NULL if unmounted.
+    int current_disk;  // 1==A:\\, 2==B:\\, etc.
+    uint32 diskmap;  // 1<<0==drive A mounted, 1<<1==drive B mounted, etc.
     uint8 main_tib_selector;
     uint32 mainstacksize;
     uint16 original_cs;

diff --git a/lx_loader.c b/lx_loader.c
@@ -200,39 +200,56 @@ static int locatePathCaseInsensitive(char *buf)
 
 static char *lxMakeUnixPath(const char *os2path, uint32 *err)
 {
+    const char *mountpoint = NULL;
+    const char *cwd = NULL;
+
+    FIXME("map devices in 2ine.cfg");
     if ((strcasecmp(os2path, "NUL") == 0) || (strcasecmp(os2path, "\\DEV\\NUL") == 0))
         os2path = "/dev/null";
     // !!! FIXME: emulate other OS/2 device names (CON, etc).
     //else if (strcasecmp(os2path, "CON") == 0)
     else {
         char drive = os2path[0];
-        if ((drive >= 'a') && (drive <= 'z'))
+        if ((drive >= 'a') && (drive <= 'z')) {
             drive += 'A' - 'a';
+        }
 
-        if ((drive >= 'A') && (drive <= 'Z')) {
-            if (os2path[1] == ':') {  // it's a drive letter.
-                if (drive == 'C')
-                    os2path += 2;  // skip "C:" if it's there.
-                else {
-                    *err = 26; //ERROR_NOT_DOS_DISK;
-                    return NULL;
-                } // else
-            } // if
-        } // if
-    } // else
+        if (((drive >= 'A') && (drive <= 'Z')) && (os2path[1] == ':')) {  // it's a drive letter.
+            os2path += 2;  // skip "C:"
+        } else {
+            drive = (GLoaderState.current_disk-1) + 'A';
+        }
+
+        const int driveidx = drive - 'A';
+        mountpoint = GLoaderState.disks[driveidx];
+        if (!mountpoint) {
+            *err = 26; //ERROR_NOT_DOS_DISK;
+            return NULL;
+        }
+
+        if (*os2path != '\\') {
+            cwd = GLoaderState.current_dir[driveidx];
+        }
+    }
 
-    const size_t len = strlen(os2path);
-    char *retval = (char *) malloc(len + 1);
+    const size_t len = (mountpoint ? strlen(mountpoint) : 0) + (cwd ? strlen(cwd) : 0) + strlen(os2path) + 3;
+    char *retval = (char *) malloc(len);
     if (!retval) {
         *err = 8;  //ERROR_NOT_ENOUGH_MEMORY;
         return NULL;
-    } // else
+    }
 
-    strcpy(retval, os2path);
+    snprintf(retval, len, "%s%s%s%s%s", mountpoint ? mountpoint : "", cwd ? "/" : "", cwd ? cwd : "", ((!*os2path) || (*os2path == '/')) ? "" : "/", os2path);
 
     for (char *ptr = strchr(retval, '\\'); ptr; ptr = strchr(ptr + 1, '\\'))
         *ptr = '/';  // convert to Unix-style path separators.
 
+    FIXME("this could be more efficient");
+    char *ptr = retval;
+    while ((ptr = strstr(ptr, "//")) != NULL) {
+        memmove(ptr, ptr + 1, strlen(ptr));
+    }
+
     locatePathCaseInsensitive(retval);
 
     return retval;