| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #include "amdfwtool.h" |
| |
| void write_or_fail(int fd, void *ptr, size_t size) |
| { |
| ssize_t written; |
| |
| written = write_from_buf_to_file(fd, ptr, size); |
| if (written < 0 || (size_t)written != size) { |
| fprintf(stderr, "%s: Error writing %zu bytes - written %zd bytes\n", |
| __func__, size, written); |
| exit(-1); |
| } |
| } |
| |
| ssize_t read_from_file_to_buf(int fd, void *buf, size_t buf_size) |
| { |
| ssize_t bytes; |
| size_t total_bytes = 0; |
| |
| do { |
| bytes = read(fd, buf + total_bytes, buf_size - total_bytes); |
| if (bytes == 0) { |
| fprintf(stderr, "Reached EOF probably\n"); |
| break; |
| } |
| |
| if (bytes < 0 && errno == EAGAIN) |
| bytes = 0; |
| |
| if (bytes < 0) { |
| fprintf(stderr, "Read failure %s\n", strerror(errno)); |
| return bytes; |
| } |
| |
| total_bytes += bytes; |
| } while (total_bytes < buf_size); |
| |
| if (total_bytes != buf_size) { |
| fprintf(stderr, "Read data size(%zu) != buffer size(%zu)\n", |
| total_bytes, buf_size); |
| return -1; |
| } |
| return buf_size; |
| } |
| |
| ssize_t write_from_buf_to_file(int fd, const void *buf, size_t buf_size) |
| { |
| ssize_t bytes; |
| size_t total_bytes = 0; |
| |
| do { |
| bytes = write(fd, buf + total_bytes, buf_size - total_bytes); |
| if (bytes < 0 && errno == EAGAIN) |
| bytes = 0; |
| |
| if (bytes < 0) { |
| fprintf(stderr, "Write failure %s\n", strerror(errno)); |
| lseek(fd, SEEK_CUR, -total_bytes); |
| return bytes; |
| } |
| |
| total_bytes += bytes; |
| } while (total_bytes < buf_size); |
| |
| if (total_bytes != buf_size) { |
| fprintf(stderr, "Wrote more data(%zu) than buffer size(%zu)\n", |
| total_bytes, buf_size); |
| lseek(fd, SEEK_CUR, -total_bytes); |
| return -1; |
| } |
| |
| return buf_size; |
| } |