util2.c

   1 /*
   2  * Utility routines used in rsync.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2013 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "ifuncs.h"
  25 #include "itypes.h"
  26 #include "inums.h"
  27
  28 extern int checksum_len;
  29
  30 /**
  31  * Sleep for a specified number of milliseconds.
  32  *
  33  * Always returns TRUE.  (In the future it might return FALSE if
  34  * interrupted.)
  35  **/
  36 int msleep(int t)
  37 {
  38         int tdiff = 0;
  39         struct timeval tval, t1, t2;
  40
  41         gettimeofday(&t1, NULL);
  42
  43         while (tdiff < t) {
  44                 tval.tv_sec = (t-tdiff)/1000;
  45                 tval.tv_usec = 1000*((t-tdiff)%1000);
  46
  47                 errno = 0;
  48                 select(0,NULL,NULL, NULL, &tval);
  49
  50                 gettimeofday(&t2, NULL);
  51                 if (t2.tv_sec < t1.tv_sec)
  52                         t1 = t2; /* Time went backwards, so start over. */
  53                 tdiff = (t2.tv_sec - t1.tv_sec)*1000 +
  54                         (t2.tv_usec - t1.tv_usec)/1000;
  55         }
  56
  57         return True;
  58 }
  59
  60 #define MALLOC_MAX 0x40000000
  61
  62 void *_new_array(unsigned long num, unsigned int size, int use_calloc)
  63 {
  64         if (num >= MALLOC_MAX/size)
  65                 return NULL;
  66         return use_calloc ? calloc(num, size) : malloc(num * size);
  67 }
  68
  69 void *_realloc_array(void *ptr, unsigned int size, size_t num)
  70 {
  71         if (num >= MALLOC_MAX/size)
  72                 return NULL;
  73         if (!ptr)
  74                 return malloc(size * num);
  75         return realloc(ptr, size * num);
  76 }
  77
  78 const char *sum_as_hex(const char *sum)
  79 {
  80         static char buf[MAX_DIGEST_LEN*2+1];
  81         int i, x1, x2;
  82         char *c = buf + checksum_len*2;
  83
  84         assert(c - buf < (int)sizeof buf);
  85
  86         *c = '\0';
  87
  88         for (i = checksum_len; --i >= 0; ) {
  89                 x1 = CVAL(sum, i);
  90                 x2 = x1 >> 4;
  91                 x1 &= 0xF;
  92                 *--c = x1 <= 9 ? x1 + '0' : x1 + 'a' - 10;
  93                 *--c = x2 <= 9 ? x2 + '0' : x2 + 'a' - 10;
  94         }
  95
  96         return buf;
  97 }
  98
  99 NORETURN void out_of_memory(const char *str)
 100 {
 101         rprintf(FERROR, "ERROR: out of memory in %s [%s]\n", str, who_am_i());
 102         exit_cleanup(RERR_MALLOC);
 103 }
 104
 105 NORETURN void overflow_exit(const char *str)
 106 {
 107         rprintf(FERROR, "ERROR: buffer overflow in %s [%s]\n", str, who_am_i());
 108         exit_cleanup(RERR_MALLOC);
 109 }