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

1 files changed, 71 insertions, 0 deletions

diff --git a/os2/dl_os2.c b/os2/dl_os2.c
new file mode 100644
index 0000000000..19f36f6aa7
--- /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;
+}
+