| 1 | #define _LARGEFILE64_SOURCE |
| 2 | #define _XOPEN_SOURCE 500 |
| 3 | #include <stdlib.h> |
| 4 | #include <unistd.h> |
| 5 | #include <errno.h> |
| 6 | |
| 7 | #include "utils.h" |
| 8 | |
| 9 | int readall(int fd, void *buf, size_t len, loff_t offset) |
| 10 | { |
| 11 | int ret; |
| 12 | |
| 13 | while(len > 0) { |
| 14 | /* |
| 15 | if(lseek(fd, offset, SEEK_SET) != offset) |
| 16 | return(-1); |
| 17 | ret = read(fd, buf, len); |
| 18 | */ |
| 19 | ret = pread64(fd, buf, len, offset); |
| 20 | if(ret < 0) |
| 21 | return(-1); |
| 22 | if(ret == 0) { |
| 23 | errno = ENODATA; |
| 24 | return(-1); |
| 25 | } |
| 26 | buf += ret; |
| 27 | len -= ret; |
| 28 | offset += ret; |
| 29 | } |
| 30 | return(0); |
| 31 | } |
| 32 | |
| 33 | int writeall(int fd, const void *buf, size_t len, loff_t offset) |
| 34 | { |
| 35 | int ret; |
| 36 | |
| 37 | while(len > 0) { |
| 38 | /* |
| 39 | if(lseek(fd, offset, SEEK_SET) != offset) |
| 40 | return(-1); |
| 41 | ret = write(fd, buf, len); |
| 42 | */ |
| 43 | ret = pwrite64(fd, buf, len, offset); |
| 44 | if(ret < 0) |
| 45 | return(-1); |
| 46 | buf += ret; |
| 47 | len -= ret; |
| 48 | offset += ret; |
| 49 | } |
| 50 | return(0); |
| 51 | } |