pdftops/GList.cxx

   1 //========================================================================
   2 //
   3 // GList.cc
   4 //
   5 // Copyright 2001-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 #include <config.h>
  10
  11 #ifdef USE_GCC_PRAGMAS
  12 #pragma implementation
  13 #endif
  14
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "gmem.h"
  18 #include "GList.h"
  19
  20 //------------------------------------------------------------------------
  21 // GList
  22 //------------------------------------------------------------------------
  23
  24 GList::GList() {
  25   size = 8;
  26   data = (void **)gmallocn(size, sizeof(void*));
  27   length = 0;
  28   inc = 0;
  29 }
  30
  31 GList::GList(int sizeA) {
  32   size = sizeA;
  33   data = (void **)gmallocn(size, sizeof(void*));
  34   length = 0;
  35   inc = 0;
  36 }
  37
  38 GList::~GList() {
  39   gfree(data);
  40 }
  41
  42 void GList::append(void *p) {
  43   if (length >= size) {
  44     expand();
  45   }
  46   data[length++] = p;
  47 }
  48
  49 void GList::append(GList *list) {
  50   int i;
  51
  52   while (length + list->length > size) {
  53     expand();
  54   }
  55   for (i = 0; i < list->length; ++i) {
  56     data[length++] = list->data[i];
  57   }
  58 }
  59
  60 void GList::insert(int i, void *p) {
  61   if (length >= size) {
  62     expand();
  63   }
  64   if (i < length) {
  65     memmove(data+i+1, data+i, (length - i) * sizeof(void *));
  66   }
  67   data[i] = p;
  68   ++length;
  69 }
  70
  71 void *GList::del(int i) {
  72   void *p;
  73
  74   p = data[i];
  75   if (i < length - 1) {
  76     memmove(data+i, data+i+1, (length - i - 1) * sizeof(void *));
  77   }
  78   --length;
  79   if (size - length >= ((inc > 0) ? inc : size/2)) {
  80     shrink();
  81   }
  82   return p;
  83 }
  84
  85 void GList::sort(int (*cmp)(const void *obj1, const void *obj2)) {
  86   qsort(data, length, sizeof(void *), cmp);
  87 }
  88
  89 void GList::expand() {
  90   size += (inc > 0) ? inc : size;
  91   data = (void **)greallocn(data, size, sizeof(void*));
  92 }
  93
  94 void GList::shrink() {
  95   size -= (inc > 0) ? inc : size/2;
  96   data = (void **)greallocn(data, size, sizeof(void*));
  97 }