pdftops/gmem.c

   1 /*
   2  * gmem.c
   3  *
   4  * Memory routines with out-of-memory checking.
   5  *
   6  * Copyright 1996-2003 Glyph & Cog, LLC
   7  */
   8
   9 #include <config.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <stddef.h>
  13 #include <string.h>
  14 #include <limits.h>
  15 #include "gmem.h"
  16
  17 #ifdef DEBUG_MEM
  18
  19 typedef struct _GMemHdr {
  20   int size;
  21   int index;
  22   struct _GMemHdr *next;
  23 } GMemHdr;
  24
  25 #define gMemHdrSize ((sizeof(GMemHdr) + 7) & ~7)
  26 #define gMemTrlSize (sizeof(long))
  27
  28 #if gmemTrlSize==8
  29 #define gMemDeadVal 0xdeadbeefdeadbeefUL
  30 #else
  31 #define gMemDeadVal 0xdeadbeefUL
  32 #endif
  33
  34 /* round data size so trailer will be aligned */
  35 #define gMemDataSize(size) \
  36   ((((size) + gMemTrlSize - 1) / gMemTrlSize) * gMemTrlSize)
  37
  38 #define gMemNLists    64
  39 #define gMemListShift  4
  40 #define gMemListMask  (gMemNLists - 1)
  41 static GMemHdr *gMemList[gMemNLists] = {
  42   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  43   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  44   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  45   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  46   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  47   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  48   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  49   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
  50 };
  51
  52 static int gMemIndex = 0;
  53 static int gMemAlloc = 0;
  54 static int gMemInUse = 0;
  55
  56 #endif /* DEBUG_MEM */
  57
  58 void *gmalloc(int size) {
  59 #ifdef DEBUG_MEM
  60   int size1;
  61   char *mem;
  62   GMemHdr *hdr;
  63   void *data;
  64   int lst;
  65   unsigned long *trl, *p;
  66
  67   if (size <= 0)
  68     return NULL;
  69   size1 = gMemDataSize(size);
  70   if (!(mem = (char *)malloc(size1 + gMemHdrSize + gMemTrlSize))) {
  71     fprintf(stderr, "Out of memory\n");
  72     exit(1);
  73   }
  74   hdr = (GMemHdr *)mem;
  75   data = (void *)(mem + gMemHdrSize);
  76   trl = (unsigned long *)(mem + gMemHdrSize + size1);
  77   hdr->size = size;
  78   hdr->index = gMemIndex++;
  79   lst = ((int)hdr >> gMemListShift) & gMemListMask;
  80   hdr->next = gMemList[lst];
  81   gMemList[lst] = hdr;
  82   ++gMemAlloc;
  83   gMemInUse += size;
  84   for (p = (unsigned long *)data; p <= trl; ++p)
  85     *p = gMemDeadVal;
  86   return data;
  87 #else
  88   void *p;
  89
  90   if (size <= 0)
  91     return NULL;
  92   if (!(p = malloc(size))) {
  93     fprintf(stderr, "Out of memory\n");
  94     exit(1);
  95   }
  96   return p;
  97 #endif
  98 }
  99
 100 void *grealloc(void *p, int size) {
 101 #ifdef DEBUG_MEM
 102   GMemHdr *hdr;
 103   void *q;
 104   int oldSize;
 105
 106   if (size <= 0) {
 107     if (p)
 108       gfree(p);
 109     return NULL;
 110   }
 111   if (p) {
 112     hdr = (GMemHdr *)((char *)p - gMemHdrSize);
 113     oldSize = hdr->size;
 114     q = gmalloc(size);
 115     memcpy(q, p, size < oldSize ? size : oldSize);
 116     gfree(p);
 117   } else {
 118     q = gmalloc(size);
 119   }
 120   return q;
 121 #else
 122   void *q;
 123
 124   if (size <= 0) {
 125     if (p)
 126       free(p);
 127     return NULL;
 128   }
 129   if (p)
 130     q = realloc(p, size);
 131   else
 132     q = malloc(size);
 133   if (!q) {
 134     fprintf(stderr, "Out of memory\n");
 135     exit(1);
 136   }
 137   return q;
 138 #endif
 139 }
 140
 141 void *gmallocn(int nObjs, int objSize) {
 142   int n;
 143
 144   if (nObjs == 0) {
 145     return NULL;
 146   }
 147   n = nObjs * objSize;
 148   if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) {
 149     fprintf(stderr, "Bogus memory allocation size\n");
 150     exit(1);
 151   }
 152   return gmalloc(n);
 153 }
 154
 155 void *greallocn(void *p, int nObjs, int objSize) {
 156   int n;
 157
 158   if (nObjs == 0) {
 159     if (p) {
 160       gfree(p);
 161     }
 162     return NULL;
 163   }
 164   n = nObjs * objSize;
 165   if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) {
 166     fprintf(stderr, "Bogus memory allocation size\n");
 167     exit(1);
 168   }
 169   return grealloc(p, n);
 170 }
 171
 172 void gfree(void *p) {
 173 #ifdef DEBUG_MEM
 174   int size;
 175   GMemHdr *hdr;
 176   GMemHdr *prevHdr, *q;
 177   int lst;
 178   unsigned long *trl, *clr;
 179
 180   if (p) {
 181     hdr = (GMemHdr *)((char *)p - gMemHdrSize);
 182     lst = ((int)hdr >> gMemListShift) & gMemListMask;
 183     for (prevHdr = NULL, q = gMemList[lst]; q; prevHdr = q, q = q->next) {
 184       if (q == hdr)
 185         break;
 186     }
 187     if (q) {
 188       if (prevHdr)
 189         prevHdr->next = hdr->next;
 190       else
 191         gMemList[lst] = hdr->next;
 192       --gMemAlloc;
 193       gMemInUse -= hdr->size;
 194       size = gMemDataSize(hdr->size);
 195       trl = (unsigned long *)((char *)hdr + gMemHdrSize + size);
 196       if (*trl != gMemDeadVal) {
 197         fprintf(stderr, "Overwrite past end of block %d at address %p\n",
 198                 hdr->index, p);
 199       }
 200       for (clr = (unsigned long *)hdr; clr <= trl; ++clr)
 201         *clr = gMemDeadVal;
 202       free(hdr);
 203     } else {
 204       fprintf(stderr, "Attempted to free bad address %p\n", p);
 205     }
 206   }
 207 #else
 208   if (p)
 209     free(p);
 210 #endif
 211 }
 212
 213 #ifdef DEBUG_MEM
 214 void gMemReport(FILE *f) {
 215   GMemHdr *p;
 216   int lst;
 217
 218   fprintf(f, "%d memory allocations in all\n", gMemIndex);
 219   if (gMemAlloc > 0) {
 220     fprintf(f, "%d memory blocks left allocated:\n", gMemAlloc);
 221     fprintf(f, " index     size\n");
 222     fprintf(f, "-------- --------\n");
 223     for (lst = 0; lst < gMemNLists; ++lst) {
 224       for (p = gMemList[lst]; p; p = p->next)
 225         fprintf(f, "%8d %8d\n", p->index, p->size);
 226     }
 227   } else {
 228     fprintf(f, "No memory blocks left allocated\n");
 229   }
 230 }
 231 #endif
 232
 233 char *copyString(char *s) {
 234   char *s1;
 235
 236   s1 = (char *)gmalloc(strlen(s) + 1);
 237   strcpy(s1, s);
 238   return s1;
 239 }