Add OS/2-specific dynamic loading routines emulating dlopen calls

diff --git a/os2/dl_os2.c b/os2/dl_os2.c
new file mode 100644 (file)
index 0000000..19f36f6
--- /dev/null
+++ b/os2/dl_os2.c
@@ -0,0 +1,71 @@
+#include "dlfcn.h"
+
+#define INCL_BASE
+#include <os2.h>
+
+static ULONG retcode;
+
+void *
+dlopen(char *path, int mode)
+{
+       HMODULE handle;
+       char tmp[260], *beg, *dot;
+       char fail[300];
+       ULONG rc;
+
+       if ((rc = DosLoadModule(fail, sizeof fail, path, &handle)) == 0)
+               return (void *)handle;
+
+       retcode = rc;
+
+       /* Not found. Check for non-FAT name and try truncated name. */
+       /* Don't know if this helps though... */
+       for (beg = dot = path + strlen(path);
+            beg > path && !strchr(":/\\", *(beg-1));
+            beg--)
+               if (*beg == '.')
+                       dot = beg;
+       if (dot - beg > 8) {
+               int n = beg+8-path;
+               memmove(tmp, path, n);
+               memmove(tmp+n, dot, strlen(dot)+1);
+               if (DosLoadModule(fail, sizeof fail, tmp, &handle) == 0)
+                       return (void *)handle;
+       }
+
+       return NULL;
+}
+
+void *
+dlsym(void *handle, char *symbol)
+{
+       ULONG rc, type;
+       PFN addr;
+
+       rc = DosQueryProcAddr((HMODULE)handle, 0, symbol, &addr);
+       if (rc == 0) {
+               rc = DosQueryProcType((HMODULE)handle, 0, symbol, &type);
+               if (rc == 0 && type == PT_32BIT)
+                       return (void *)addr;
+               rc = ERROR_CALL_NOT_IMPLEMENTED;
+       }
+       retcode = rc;
+       return NULL;
+}
+
+char *
+dlerror(void)
+{
+       static char buf[300];
+       ULONG len;
+
+       if (retcode == 0)
+               return NULL;
+       if (DosGetMessage(NULL, 0, buf, sizeof buf - 1, retcode, "OSO001.MSG", &len))
+               sprintf(buf, "OS/2 system error code %d", retcode);
+       else
+               buf[len] = '\0';
+       retcode = 0;
+       return buf;
+}
+