Make demo programs work from any directory, and install them

1 files changed, 68 insertions, 0 deletions

diff --git a/examples/file_utils.c b/examples/file_utils.c
new file mode 100644
index 0000000..2b00bdc
--- /dev/null
+++ b/examples/file_utils.c
@@ -0,0 +1,68 @@
+/*
+  Copyright 2019-2020 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#if !defined(__APPLE__) && !defined(_GNU_SOURCE)
+#	define _GNU_SOURCE
+#endif
+
+#include "file_utils.h"
+
+#ifdef _WIN32
+#	include <io.h>
+#	include <windows.h>
+#	define F_OK 0
+#else
+#	include <libgen.h>
+#	include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char*
+resourcePath(const char* const programPath, const char* const name)
+{
+	char* const binary = strdup(programPath);
+
+#ifdef _WIN32
+	char programDir[_MAX_DIR];
+	_splitpath(binary, programDir, NULL, NULL, NULL);
+	_splitpath(binary, NULL, programDir + strlen(programDir), NULL, NULL);
+	programDir[strlen(programDir) - 1] = '\0';
+#else
+	char* const programDir = dirname(binary);
+#endif
+
+	const size_t programDirLen = strlen(programDir);
+	const size_t nameLen       = strlen(name);
+	const size_t totalLen      = programDirLen + nameLen + 4;
+
+	char* const programRelative = (char*)calloc(totalLen, 1);
+	snprintf(programRelative, totalLen, "%s/%s", programDir, name);
+	if (!access(programRelative, F_OK)) {
+		free(binary);
+		return programRelative;
+	}
+
+	free(programRelative);
+	free(binary);
+
+	const size_t sysPathLen = strlen(PUGL_DATA_DIR) + nameLen + 4;
+	char* const  sysPath    = (char*)calloc(sysPathLen, 1);
+	snprintf(sysPath, sysPathLen, "%s/%s", PUGL_DATA_DIR, name);
+	return sysPath;
+}