dedup

deduplicating backup program
git clone git://git.2f30.org/dedup.git
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misc.c (1064B)


      1 #include <sys/types.h>
      2 
      3 #include <stdarg.h>
      4 #include <stdio.h>
      5 #include <stdlib.h>
      6 #include <unistd.h>
      7 
      8 #define NERRBUF	128
      9 static char errbuf[NERRBUF];
     10 
     11 ssize_t
     12 xread(int fd, void *buf, size_t nbytes)
     13 {
     14 	unsigned char *bp = buf;
     15 	ssize_t total = 0;
     16 
     17 	while (nbytes > 0) {
     18 		ssize_t n;
     19 
     20 		n = read(fd, &bp[total], nbytes);
     21 		if (n < 0)
     22 			return -1;
     23 		else if (n == 0)
     24 			return total;
     25 		total += n;
     26 		nbytes -= n;
     27 	}
     28 	return total;
     29 }
     30 
     31 ssize_t
     32 xwrite(int fd, void *buf, size_t nbytes)
     33 {
     34 	unsigned char *bp = buf;
     35 	ssize_t total = 0;
     36 
     37 	while (nbytes > 0) {
     38 		ssize_t n;
     39 
     40 		n = write(fd, &bp[total], nbytes);
     41 		if (n < 0)
     42 			return -1;
     43 		else if (n == 0)
     44 			return total;
     45 		total += n;
     46 		nbytes -= n;
     47 	}
     48 	return total;
     49 }
     50 
     51 void
     52 seterr(char *fmt, ...)
     53 {
     54 	va_list ap;
     55 
     56 	va_start(ap, fmt);
     57 	vsnprintf(errbuf, NERRBUF, fmt, ap);
     58 	va_end(ap);
     59 }
     60 
     61 void
     62 printerr(char *fmt, ...)
     63 {
     64 	va_list ap;
     65 
     66 	va_start(ap, fmt);
     67 	vfprintf(stderr, fmt, ap);
     68 	if (errbuf[0] == '\0')
     69 		fprintf(stderr, ": unknown error\n");
     70 	else
     71 		fprintf(stderr, ": %s\n", errbuf);
     72 	va_end(ap);
     73 	exit(1);
     74 }