added vector.c

ppthtml/vector.c

@@ -0,0 +1,70 @@
+
+/**
+ * @file   vector.c
+ * @brief  Functions for creating and manipulating vectors.
+ *
+ * @author Jon Schutz
+ * @date   05-Feb-2001
+ **/
+
+#include "vector.h"
+#include <stdlib.h>
+#include <string.h>
+
+/** Resize a vector.
+    @param v The vector to resize.
+    @param size The new size of the vector.  Must be >= 0.
+    @param element_size The size of elements in the vector.
+    @return 0 on success, -1 if a memory allocation error occurred.
+*/
+int
+vector_resize(vector *v, size_t size, size_t element_size)
+{
+  void *b;
+
+  b = (v->array)?realloc(v->array, size * element_size)
+    :malloc(size * element_size);
+
+  if ((0 < (size * element_size)) && (NULL == b))
+    return -1;
+
+  if (size > v->array_size) {
+    memset(b + v->array_size * element_size, 0,
+	   (size - v->array_size) * element_size);
+  }
+  v->array = b;
+  v->array_size = size;
+  return 0;
+}
+
+/** Create a new vector. 
+
+    @param v The vector to be initialised.
+    @param size The size of the set.
+    @param element_size The size of elements in the vector.
+    @return 0 on success, -1 on error.
+*/
+int
+vector_create(vector *v, size_t size, size_t element_size)
+{
+  v->array = NULL;
+  v->array_size = 0;
+  v->index = 0;
+  
+  return vector_resize(v, size, element_size);
+}
+
+/** Destroy a vector, freeing storage associated with it. */
+void
+vector_destroy(vector *v)
+{
+  free(v->array);
+  v->array = NULL;
+  v->array_size = 0;
+}  
+
+int
+word_vector_strcmp(const char **a, const char **b)
+{
+  return strcmp(*a, *b);
+}