7e4c303fe0
hd would error out on files that were not a multiple of its read
buffer size (4096). For example:
Read error on init.rc, offset 17040 len 4096, No such file or directory
The fix is to stop reading on EOF instead of treating it as an
error.
Signed-off-by: Scott Anderson <saa@google.com>
(cherry picked from commit a9fac4155f)
Change-Id: Ib2af725fc39e96c2f81559f61979d451604d4817
98 lines
2 KiB
C
98 lines
2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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int hd_main(int argc, char *argv[])
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{
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int c;
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int fd;
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unsigned char buf[4096];
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int res;
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int read_len;
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int rv = 0;
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int i;
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int filepos = 0;
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int sum;
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int lsum;
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int base = -1;
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int count = 0;
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int repeat = 0;
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do {
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c = getopt(argc, argv, "b:c:r:");
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if (c == EOF)
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break;
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switch (c) {
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case 'b':
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base = strtol(optarg, NULL, 0);
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break;
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case 'c':
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count = strtol(optarg, NULL, 0);
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break;
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case 'r':
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repeat = strtol(optarg, NULL, 0);
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break;
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case '?':
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fprintf(stderr, "%s: invalid option -%c\n",
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argv[0], optopt);
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exit(1);
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}
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} while (1);
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if (optind + 1 != argc) {
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fprintf(stderr, "Usage: %s [-b base] [-c count] [-r delay] file\n", argv[0]);
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exit(1);
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}
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fd = open(argv[optind], O_RDONLY);
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if(fd < 0) {
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fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
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return 1;
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}
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do {
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if(base >= 0) {
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lseek(fd, base, SEEK_SET);
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filepos = base;
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}
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sum = 0;
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lsum = 0;
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while(1) {
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read_len = sizeof(buf);
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if(count > 0 && base + count - filepos < read_len)
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read_len = base + count - filepos;
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res = read(fd, &buf, read_len);
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if(res == 0)
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break;
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for(i = 0; i < res; i++) {
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if((i & 15) == 0) {
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printf("%08x: ", filepos + i);
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}
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lsum += buf[i];
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sum += buf[i];
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printf("%02x ", buf[i]);
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if(((i & 15) == 15) || (i == res - 1)) {
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printf("s %x\n", lsum);
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lsum = 0;
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}
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}
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if(res < 0) {
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printf("Read error on %s, offset %d len %d, %s\n", argv[optind], filepos, read_len, strerror(errno));
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return 1;
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}
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filepos += res;
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if(filepos == base + count)
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break;
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}
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printf("sum %x\n", sum);
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if(repeat)
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sleep(repeat);
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} while(repeat);
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return 0;
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}
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