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) 2003-2020 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 /**
  29  * Sleep for a specified number of milliseconds.
  30  *
  31  * Always returns True.
  32  **/
  33 int msleep(int t)
  34 {
  35 #ifdef HAVE_NANOSLEEP
  36         struct timespec ts;
  37
  38         ts.tv_sec = t / 1000;
  39         ts.tv_nsec = (t % 1000) * 1000000L;
  40
  41         while (nanosleep(&ts, &ts) < 0 && errno == EINTR) {}
  42
  43 #elif defined HAVE_USLEEP
  44         usleep(t*1000);
  45
  46 #else
  47         int tdiff = 0;
  48         struct timeval tval, t1, t2;
  49
  50         gettimeofday(&t1, NULL);
  51
  52         while (tdiff < t) {
  53                 tval.tv_sec = (t-tdiff)/1000;
  54                 tval.tv_usec = 1000*((t-tdiff)%1000);
  55
  56                 errno = 0;
  57                 select(0,NULL,NULL, NULL, &tval);
  58
  59                 gettimeofday(&t2, NULL);
  60                 tdiff = (t2.tv_sec - t1.tv_sec)*1000 +
  61                         (t2.tv_usec - t1.tv_usec)/1000;
  62                 if (tdiff < 0)
  63                         t1 = t2; /* Time went backwards, so start over. */
  64         }
  65 #endif
  66
  67         return True;
  68 }
  69
  70 #define MALLOC_MAX 0x40000000
  71
  72 void *_new_array(unsigned long num, unsigned int size, int use_calloc)
  73 {
  74         if (num >= MALLOC_MAX/size)
  75                 return NULL;
  76         return use_calloc ? calloc(num, size) : malloc(num * size);
  77 }
  78
  79 void *_realloc_array(void *ptr, unsigned int size, size_t num)
  80 {
  81         if (num >= MALLOC_MAX/size)
  82                 return NULL;
  83         if (!ptr)
  84                 return malloc(size * num);
  85         return realloc(ptr, size * num);
  86 }
  87
  88 const char *sum_as_hex(int csum_type, const char *sum, int flist_csum)
  89 {
  90         static char buf[MAX_DIGEST_LEN*2+1];
  91         int i, x1, x2;
  92         int sum_len = csum_len_for_type(csum_type, flist_csum);
  93         char *c = buf + sum_len*2;
  94
  95         assert(c - buf < (int)sizeof buf);
  96
  97         *c = '\0';
  98
  99         for (i = sum_len; --i >= 0; ) {
 100                 x1 = CVAL(sum, i);
 101                 x2 = x1 >> 4;
 102                 x1 &= 0xF;
 103                 *--c = x1 <= 9 ? x1 + '0' : x1 + 'a' - 10;
 104                 *--c = x2 <= 9 ? x2 + '0' : x2 + 'a' - 10;
 105         }
 106
 107         return buf;
 108 }
 109
 110 NORETURN void out_of_memory(const char *str)
 111 {
 112         rprintf(FERROR, "ERROR: out of memory in %s [%s]\n", str, who_am_i());
 113         exit_cleanup(RERR_MALLOC);
 114 }
 115
 116 NORETURN void overflow_exit(const char *str)
 117 {
 118         rprintf(FERROR, "ERROR: buffer overflow in %s [%s]\n", str, who_am_i());
 119         exit_cleanup(RERR_MALLOC);
 120 }