Add a command-line test program.

At the moment it only tests MsiGetFileVersion, because that's the
piece I just found a problem in, but I could easily extend it to have
convenient command-line test rigs for other parts of this setup too.

.gitignore

@@ -7,6 +7,7 @@
 *.a
 *.so
 *.so.*
+/test
 /Makefile
 /Makefile.in
 /aclocal.m4

Makefile.am

@@ -2,6 +2,8 @@ libdir = $(bindir)
 
 ACLOCAL_AMFLAGS = -I m4
 
+noinst_PROGRAMS = test
+
 lib_LTLIBRARIES = libwinterop.la libmsi.la libpreload.la
 
 libwinterop_la_SOURCES = makecab.c readcab.c winterop-stubs.c		\
@@ -9,11 +11,14 @@ memory.c memory.h dupstr.c dupstr.h subproc.c subproc.h uchars.c	\
 uchars.h
 
 libmsi_la_SOURCES = makemsi.c md5.c memory.c memory.h version.c	\
-dupstr.c dupstr.h subproc.c subproc.h uchars.c uchars.h
+dupstr.c dupstr.h subproc.c subproc.h uchars.c uchars.h api.h
 
 libpreload_la_SOURCES = preload.c
 libpreload_la_LDFLAGS = -ldl
 
+test_SOURCES = test.c api.h misc.h
+test_LDADD = libmsi.la
+
 bin_SCRIPTS = wrapper.py makecab.py
 
 install-exec-hook:

api.h

@@ -0,0 +1,6 @@
+#include <stdint.h>
+#include <uchar.h>
+
+uint32_t MsiGetFileVersionW(const char16_t *filename,
+                            char16_t *version, uint32_t *version_size,
+                            char16_t *language, uint32_t *language_size);

misc.h

@@ -0,0 +1 @@
+#define lenof(x) (sizeof(x)/sizeof(*(x)))

test.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+
+#include "misc.h"
+#include "uchars.h"
+#include "api.h"
+
+int main(int argc, char **argv)
+{
+    if (argc > 2 && !strcmp(argv[1], "version")) {
+        const char *filename8 = argv[2];
+        char16_t filename16[4096];
+        uint32_t filename16size = lenof(filename16);
+        c16cpy(filename16, &filename16size, filename8);
+        char16_t version[4096], language[4096];
+        uint32_t versionsize = lenof(version), languagesize = lenof(language);
+        uint32_t retd =
+            MsiGetFileVersionW(filename16, version, &versionsize,
+                               language, &languagesize);
+        printf("MsiGetFileVersionW(\"%s\") = %"PRId32"\n", filename8, retd);
+        if (retd == 0) {
+            printf("  version = \"%s\"\n  language = \"%s\"\n",
+                   ascii(version, false), ascii(language, false));
+        }
+    } else {
+        fprintf(stderr, "usage: ./test version <file>\n");
+        return 1;
+    }
+    return 0;
+}

uchars.c

@@ -16,7 +16,7 @@ char *ascii(const char16_t *wstr, bool translate_slashes)
     return ret;
 }
 
-void c16cpy(char16_t *out, uint32_t *outsize, char *s)
+void c16cpy(char16_t *out, uint32_t *outsize, const char *s)
 {
     uint32_t retlen = 0;
     while (retlen < *outsize) {

uchars.h

@@ -3,4 +3,4 @@
 #include <stdbool.h>
 
 char *ascii(const char16_t *wstr, bool translate_slashes);
-void c16cpy(char16_t *out, uint32_t *outsize, char *s);
+void c16cpy(char16_t *out, uint32_t *outsize, const char *s);

version.c

@@ -11,6 +11,7 @@
 
 #include "memory.h"
 #include "uchars.h"
+#include "api.h"
 
 uint32_t MsiGetFileVersionW(const char16_t *filename,
                             char16_t *version, uint32_t *version_size,