./htsarrays.h

/* ------------------------------------------------------------ */
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/* ------------------------------------------------------------ */
/* File: Arrays                                                 */
/* Author: Xavier Roche                                         */
/* ------------------------------------------------------------ */

#ifndef HTS_ARRAYS_DEFSTATIC
#define HTS_ARRAYS_DEFSTATIC

/* System definitions. */
#include <stdlib.h>
#include <string.h>

#include "htssafe.h"

/* Memory allocation assertion failure */
static void hts_record_assert_memory_failed(const size_t size) {
  fprintf(stderr, "memory allocation failed (%lu bytes)", \
          (long int) size); \
  assertf(! "memory allocation failed"); \
}

/** Dynamic array of T elements. **/
#define TypedArray(T) \
  struct {            \
    /** Elements. **/ \
    union {           \
      /** Typed. **/  \
      T* elts;        \
      /** Opaque. **/ \
      void* ptr;      \
    } data;           \
    /** Count. **/    \
    size_t size;      \
    /** Capacity. **/ \
    size_t capa;      \
  }
#define EMPTY_TYPED_ARRAY { { NULL }, 0, 0 }

/** Array size, in elements. **/
#define TypedArraySize(A)   ((A).size)

/** Array capacity, in elements. **/
#define TypedArrayCapa(A)   ((A).capa)

/**
 * Remaining free space, in elements. 
 * Macro, first element evaluated multiple times.
 **/
#define TypedArrayRoom(A)   ( TypedArrayCapa(A) - TypedArraySize(A) )

/** Array elements, of type T*. **/
#define TypedArrayElts(A)   ((A).data.elts)

/** Array pointer, of type void*. **/
#define TypedArrayPtr(A)    ((A).data.ptr)

/** Size of T. **/
#define TypedArrayWidth(A)  (sizeof(*TypedArrayElts(A)))

/** Nth element of the array. **/
#define TypedArrayNth(A, N) (TypedArrayElts(A)[N])

/**
 * Tail of the array (outside the array). 
 * The returned pointer points to the beginning of TypedArrayRoom(A)
 * free elements.
 **/
#define TypedArrayTail(A) (TypedArrayNth(A, TypedArraySize(A)))

/**
  * Ensure at least 'ROOM' elements can be put in the remaining space.
  * After a call to this macro, TypedArrayRoom(A) is guaranteed to be at 
  * least equal to 'ROOM'.
  **/
#define TypedArrayEnsureRoom(A, ROOM) do { \
  const size_t room_ = (ROOM); \
  while (TypedArrayRoom(A) < room_) { \
    TypedArrayCapa(A) = TypedArrayCapa(A) < 16 ? 16 : TypedArrayCapa(A) * 2; \
  } \
  TypedArrayPtr(A) = realloc(TypedArrayPtr(A), \
                             TypedArrayCapa(A)*TypedArrayWidth(A)); \
  if (TypedArrayPtr(A) == NULL) { \
    hts_record_assert_memory_failed(TypedArrayCapa(A)*TypedArrayWidth(A)); \
  } \
} while(0)

/** Add an element. Macro, first element evaluated multiple times. **/
#define TypedArrayAdd(A, E) do { \
  TypedArrayEnsureRoom(A, 1); \
  assertf(TypedArraySize(A) < TypedArrayCapa(A)); \
  TypedArrayTail(A) = (E); \
  TypedArraySize(A)++; \
} while(0)

/**
 * Add 'COUNT' elements from 'PTR'. 
 * Macro, first element evaluated multiple times.
 **/
#define TypedArrayAppend(A, PTR, COUNT) do { \
  const size_t count_ = (COUNT); \
  /* This 1-case is to benefit from type safety. */ \
  if (count_ == 1) { \
    TypedArrayAdd(A, *(PTR)); \
  } else { \
    const void *const source_ = (PTR); \
    TypedArrayEnsureRoom(A, count_); \
    assertf(count_ <= TypedArrayRoom(A)); \
    memcpy(&TypedArrayTail(A), source_, count_ * TypedArrayWidth(A)); \
    TypedArraySize(A) += count_; \
  } \
} while(0)

/** Clear an array, freeing memory and clearing size and capacity. **/
#define TypedArrayFree(A) do { \
  if (TypedArrayPtr(A) != NULL) { \
    TypedArrayCapa(A) = TypedArraySize(A) = 0; \
    free(TypedArrayPtr(A)); \
    TypedArrayPtr(A) = NULL; \
  } \
} while(0)

#endif

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