Make it good™

src/util.c

@@ -0,0 +1,57 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+#include "dulcepan.h"
+
+static void vlog_prefixed(const char *prefix, const char *fmt, va_list args) {
+	fprintf(stderr, "[%s] ", prefix);
+	vfprintf(stderr, fmt, args);
+	fprintf(stderr, "\n");
+}
+
+void dp_log_error(const char *fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	vlog_prefixed("error", fmt, args);
+	va_end(args);
+}
+
+void dp_log_fatal(const char *fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	vlog_prefixed("FATAL", fmt, args);
+	va_end(args);
+	exit(1);
+}
+
+void *dp_zalloc(size_t size) {
+	void *ptr = calloc(1, size);
+	if (ptr == NULL) {
+		dp_log_fatal("Failed to allocate %zu bytes", size);
+	}
+	return ptr;
+}
+
+const char *dp_ext_from_path(const char *path) {
+	size_t len = strlen(path);
+	for (size_t i = len; i-- > 0;) {
+		if (path[i] == '.') {
+			return path + i + 1;
+		} else if (path[i] == '/') {
+			break;
+		}
+	}
+	return path + len;
+}
+
+enum dp_file_format dp_ext_to_format(const char *ext) {
+	if (strcasecmp(ext, "ppm") == 0) {
+		return DP_FILE_PPM;
+	} else if (strcasecmp(ext, "png") == 0) {
+		return DP_FILE_PNG;
+	}
+	return DP_FILE_UNKNOWN;
+}