1 files changed, 76 insertions, 0 deletions
diff --git a/snag/src/util.c b/snag/src/util.c
new file mode 100644
index 0000000..8cc9b18
--- /dev/null
+++ b/snag/src/util.c
@@ -0,0 +1,76 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "util.h"
+
+#if !DEBUG
+void log(const char* format, ...) {
+#else
+void _log(int line, const char* file, const char* format, ...) {
+	fprintf(stderr, "%s:%d: info: ", file, line);
+#endif
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+}
+
+#if !DEBUG
+void die(const char* format, ...) {
+#else
+void _die(int line, const char* file, const char* format, ...) {
+	fprintf(stderr, "%s:%d: error: ", file, line);
+#endif
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+	fprintf(stderr, "\n");
+    exit(1);
+}
+
+#if !DEBUG
+void* emalloc(size_t size, char* alloc_reason) {
+	void* d = malloc(size);
+	if (d == NULL) _die("failed to allocate '%s': %s", alloc_reason, strerror(errno));
+	return d;
+}
+#else
+void* _emalloc(int line, const char* file, size_t size, char* alloc_reason) {
+	void* d = malloc(size);
+	if (d == NULL) _die(line, file, "failed to allocate '%s': %s", alloc_reason, strerror(errno));
+	return d;
+}
+#endif
+
+char* vastrcat_(int dummy, ...) {
+
+    va_list args;
+    va_list args2;
+    va_start(args, dummy);
+	va_copy(args2, args);
+
+	// get len of output string
+	size_t len = 0;
+    char* arg = NULL;
+    while ((arg = va_arg(args, char*))) {
+		len += strlen(arg);
+    }
+    va_end(args);
+
+	// allocate and build output
+	char* output = malloc(len + 1);
+    if (!output) return NULL;
+	char* p = output;
+    while ((arg = va_arg(args, char*))) {
+		size_t alen = strlen(arg);
+		memcpy(p, arg, alen);
+		p += alen;
+    }
+	output[len] = '\0';
+    va_end(args2);
+
+	return output;
+}