Add vector utility functions

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 file changed, 38 insertions, 0 deletions

diff --git a/vector.c b/vector.cnew file mode 100644index 0000000..0863908--- /dev/null+++ b/vector.c@@ -0,0 +1,38 @@+#include <stdio.h>+#include <string.h>+#include <errno.h>+#include "vector.h"++static int grow(struct vector *vec, int gently)+{+	size_t new_alloc;+	void *new_data;++	new_alloc = vec->alloc * 3 / 2;+	if (!new_alloc)+		new_alloc = 8;+	new_data = realloc(vec->data, new_alloc * vec->size);+	if (!new_data) {+		if (gently)+			return ENOMEM;+		perror("vector.c:grow()");+		exit(1);+	}+	vec->data = new_data;+	vec->alloc = new_alloc;+	return 0;+}++int vector_push(struct vector *vec, const void *data, int gently)+{+	int rc;++	if (vec->count == vec->alloc && (rc = grow(vec, gently)))+		return rc;+	if (data)+		memmove(vec->data + vec->count * vec->size, data, vec->size);+	else+		memset(vec->data + vec->count * vec->size, 0, vec->size);+	vec->count++;+	return 0;+}
diff --git a/vector.c b/vector.c
new file mode 100644
index 0000000..0863908
--- /dev/null
+++ b/vector.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "vector.h"
+
+static int grow(struct vector *vec, int gently)
+{
+	size_t new_alloc;
+	void *new_data;
+
+	new_alloc = vec->alloc * 3 / 2;
+	if (!new_alloc)
+		new_alloc = 8;
+	new_data = realloc(vec->data, new_alloc * vec->size);
+	if (!new_data) {
+		if (gently)
+			return ENOMEM;
+		perror("vector.c:grow()");
+		exit(1);
+	}
+	vec->data = new_data;
+	vec->alloc = new_alloc;
+	return 0;
+}
+
+int vector_push(struct vector *vec, const void *data, int gently)
+{
+	int rc;
+
+	if (vec->count == vec->alloc && (rc = grow(vec, gently)))
+		return rc;
+	if (data)
+		memmove(vec->data + vec->count * vec->size, data, vec->size);
+	else
+		memset(vec->data + vec->count * vec->size, 0, vec->size);
+	vec->count++;
+	return 0;
+}