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rsync 3.2.3

    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 "itypes.h"
   25: #include "inums.h"
   26: 
   27: extern size_t max_alloc;
   28: 
   29: char *do_calloc = "42";
   30: 
   31: /**
   32:  * Sleep for a specified number of milliseconds.
   33:  *
   34:  * Always returns True.
   35:  **/
   36: int msleep(int t)
   37: {
   38: #ifdef HAVE_NANOSLEEP
   39: 	struct timespec ts;
   40: 
   41: 	ts.tv_sec = t / 1000;
   42: 	ts.tv_nsec = (t % 1000) * 1000000L;
   43: 
   44: 	while (nanosleep(&ts, &ts) < 0 && errno == EINTR) {}
   45: 
   46: #elif defined HAVE_USLEEP
   47: 	usleep(t*1000);
   48: 
   49: #else
   50: 	int tdiff = 0;
   51: 	struct timeval tval, t1, t2;
   52: 
   53: 	gettimeofday(&t1, NULL);
   54: 
   55: 	while (tdiff < t) {
   56: 		tval.tv_sec = (t-tdiff)/1000;
   57: 		tval.tv_usec = 1000*((t-tdiff)%1000);
   58: 
   59: 		errno = 0;
   60: 		select(0,NULL,NULL, NULL, &tval);
   61: 
   62: 		gettimeofday(&t2, NULL);
   63: 		tdiff = (t2.tv_sec - t1.tv_sec)*1000 +
   64: 			(t2.tv_usec - t1.tv_usec)/1000;
   65: 		if (tdiff < 0)
   66: 			t1 = t2; /* Time went backwards, so start over. */
   67: 	}
   68: #endif
   69: 
   70: 	return True;
   71: }
   72: 
   73: void *my_alloc(void *ptr, size_t num, size_t size, const char *file, int line)
   74: {
   75: 	if (max_alloc && num >= max_alloc/size) {
   76: 		if (!file)
   77: 			return NULL;
   78: 		rprintf(FERROR, "[%s] exceeded --max-alloc=%s setting (file=%s, line=%d)\n",
   79: 			who_am_i(), do_big_num(max_alloc, 0, NULL), src_file(file), line);
   80: 		exit_cleanup(RERR_MALLOC);
   81: 	}
   82: 	if (!ptr)
   83: 		ptr = malloc(num * size);
   84: 	else if (ptr == do_calloc)
   85: 		ptr = calloc(num, size);
   86: 	else
   87: 		ptr = realloc(ptr, num * size);
   88: 	if (!ptr && file)
   89: 		_out_of_memory("my_alloc caller", file, line);
   90: 	return ptr;
   91: }
   92: 
   93: const char *sum_as_hex(int csum_type, const char *sum, int flist_csum)
   94: {
   95: 	static char buf[MAX_DIGEST_LEN*2+1];
   96: 	int i, x1, x2;
   97: 	int canonical = canonical_checksum(csum_type);
   98: 	int sum_len = csum_len_for_type(csum_type, flist_csum);
   99: 	char *c;
  100: 
  101: 	if (!canonical)
  102: 		return NULL;
  103: 
  104: 	assert(sum_len*2 < (int)sizeof buf);
  105: 
  106: 	for (i = sum_len, c = buf; --i >= 0; ) {
  107: 		int ndx = canonical < 0 ? sum_len - i - 1 : i;
  108: 		x2 = CVAL(sum, ndx);
  109: 		x1 = x2 >> 4;
  110: 		x2 &= 0xF;
  111: 		*c++ = x1 <= 9 ? x1 + '0' : x1 + 'a' - 10;
  112: 		*c++ = x2 <= 9 ? x2 + '0' : x2 + 'a' - 10;
  113: 	}
  114: 
  115: 	*c = '\0';
  116: 
  117: 	return buf;
  118: }
  119: 
  120: NORETURN void _out_of_memory(const char *msg, const char *file, int line)
  121: {
  122: 	rprintf(FERROR, "[%s] out of memory: %s (file=%s, line=%d)\n", who_am_i(), msg, src_file(file), line);
  123: 	exit_cleanup(RERR_MALLOC);
  124: }
  125: 
  126: NORETURN void _overflow_exit(const char *msg, const char *file, int line)
  127: {
  128: 	rprintf(FERROR, "[%s] buffer overflow: %s (file=%s, line=%d)\n", who_am_i(), msg, src_file(file), line);
  129: 	exit_cleanup(RERR_MALLOC);
  130: }
  131: 
  132: const char *src_file(const char *file)
  133: {
  134: 	static const char *util2 = __FILE__;
  135: 	static int prefix = -1;
  136: 
  137: 	if (prefix < 0) {
  138: 		const char *cp = strrchr(util2, '/');
  139: 		prefix = cp ? cp - util2 + 1 : 0;
  140: 	}
  141: 
  142: 	if (prefix && strncmp(file, util2, prefix) == 0)
  143: 		return file + prefix;
  144: 	return file;
  145: }