From c0fba758e60e2ff4c1bebd566d9a0e56276d07ec Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Sat, 2 Apr 2022 16:20:47 +0100
Subject: [PATCH] Standalone screenshot utility.

I used this for testing the new windows/utils/screenshot.c, and who
knows, it might come in useful again.
---
 windows/CMakeLists.txt    |  4 ++++
 windows/test_screenshot.c | 45 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 windows/test_screenshot.c

diff --git a/windows/CMakeLists.txt b/windows/CMakeLists.txt
index b988792a..79a09eda 100644
--- a/windows/CMakeLists.txt
+++ b/windows/CMakeLists.txt
@@ -176,3 +176,7 @@ add_executable(test_split_into_argv
   utils/split_into_argv.c)
 target_compile_definitions(test_split_into_argv PRIVATE TEST)
 target_link_libraries(test_split_into_argv utils ${platform_libraries})
+
+add_executable(test_screenshot
+  test_screenshot.c)
+target_link_libraries(test_screenshot utils ${platform_libraries})
diff --git a/windows/test_screenshot.c b/windows/test_screenshot.c
new file mode 100644
index 00000000..1e3a20d7
--- /dev/null
+++ b/windows/test_screenshot.c
@@ -0,0 +1,45 @@
+#include "putty.h"
+
+static NORETURN PRINTF_LIKE(1, 2) void fatal_error(const char *p, ...)
+{
+    va_list ap;
+    fprintf(stderr, "screenshot: ");
+    va_start(ap, p);
+    vfprintf(stderr, p, ap);
+    va_end(ap);
+    fputc('\n', stderr);
+    exit(1);
+}
+
+void out_of_memory(void) { fatal_error("out of memory"); }
+
+int main(int argc, char **argv)
+{
+    const char *outfile = NULL;
+
+    AuxMatchOpt amo = aux_match_opt_init(argc-1, argv+1, 0, fatal_error);
+    while (!aux_match_done(&amo)) {
+        char *val;
+        #define match_opt(...) aux_match_opt( \
+            &amo, NULL, __VA_ARGS__, (const char *)NULL)
+        #define match_optval(...) aux_match_opt( \
+            &amo, &val, __VA_ARGS__, (const char *)NULL)
+
+        if (aux_match_arg(&amo, &val)) {
+            fatal_error("unexpected argument '%s'", val);
+        } else if (match_optval("-o", "--output")) {
+            outfile = val;
+        } else {
+            fatal_error("unrecognised option '%s'\n", amo.argv[amo.index]);
+        }
+    }
+
+    if (!outfile)
+        fatal_error("expected an output file name");
+
+    char *err = save_screenshot(NULL, outfile);
+    if (err)
+        fatal_error("%s", err);
+
+    return 0;
+}