1 files changed, 133 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..1e44194
--- /dev/null
+++ b/util.c
@@ -0,0 +1,133 @@
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdnoreturn.h>
+#include <string.h>
+#include "util.h"
+
+char *argv0;
+
+static void
+vwarn(const char *fmt, va_list ap)
+{
+	fprintf(stderr, "%s: ", argv0);
+	vfprintf(stderr, fmt, ap);
+	if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
+		fputc(' ', stderr);
+		perror(NULL);
+	} else {
+		fputc('\n', stderr);
+	}
+}
+
+void
+warn(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vwarn(fmt, ap);
+	va_end(ap);
+}
+
+noreturn void
+fatal(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vwarn(fmt, ap);
+	va_end(ap);
+	exit(1);
+}
+
+void *
+reallocarray(void *buf, size_t n, size_t m)
+{
+	if (n > 0 && SIZE_MAX / n < m) {
+		errno = ENOMEM;
+		return NULL;
+	}
+	return realloc(buf, n * m);
+}
+
+void *
+xreallocarray(void *buf, size_t n, size_t m)
+{
+	buf = reallocarray(buf, n, m);
+	if (!buf)
+		fatal("reallocarray:");
+
+	return buf;
+}
+
+void *
+xmalloc(size_t len)
+{
+	void *buf;
+
+	buf = malloc(len);
+	if (!buf)
+		fatal("malloc:");
+
+	return buf;
+}
+
+char *
+progname(char *name, char *fallback)
+{
+	char *slash;
+
+	if (!name)
+		return fallback;
+	slash = strrchr(name, '/');
+	return slash ? slash + 1 : name;
+}
+
+void *
+arrayadd(struct array *a, size_t n)
+{
+	void *v;
+
+	if (a->cap - a->len < n) {
+		do a->cap = a->cap ? a->cap * 2 : 256;
+		while (a->cap - a->len < n);
+		a->val = realloc(a->val, a->cap);
+		if (!a->val)
+			fatal("realloc");
+	}
+	v = (char *)a->val + a->len;
+	a->len += n;
+
+	return v;
+}
+
+void
+arrayaddptr(struct array *a, void *v)
+{
+	*(void **)arrayadd(a, sizeof(v)) = v;
+}
+
+void
+arrayaddbuf(struct array *a, const void *src, size_t n)
+{
+	memcpy(arrayadd(a, n), src, n);
+}
+
+void
+listinsert(struct list *list, struct list *new)
+{
+	new->next = list->next;
+	new->prev = list;
+	list->next->prev = new;
+	list->next = new;
+}
+
+void
+listremove(struct list *list)
+{
+	list->next->prev = list->prev;
+	list->prev->next = list->next;
+}