| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <alloca.h> |
| #include <errno.h> |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| |
| #if CPUINFO_MOCK |
| #include <cpuinfo-mock.h> |
| #endif |
| #include <linux/api.h> |
| #include <log.h> |
| |
| |
| bool cpuinfo_linux_parse_multiline_file(const char* filename, size_t buffer_size, cpuinfo_line_callback callback, void* context) |
| { |
| int file = -1; |
| bool status = false; |
| char* buffer = (char*) alloca(buffer_size); |
| |
| #if CPUINFO_MOCK |
| file = cpuinfo_mock_open(filename, O_RDONLY); |
| #else |
| file = open(filename, O_RDONLY); |
| #endif |
| if (file == -1) { |
| cpuinfo_log_info("failed to open %s: %s", filename, strerror(errno)); |
| goto cleanup; |
| } |
| |
| /* Only used for error reporting */ |
| size_t position = 0; |
| uint64_t line_number = 1; |
| const char* buffer_end = &buffer[buffer_size]; |
| char* data_start = buffer; |
| ssize_t bytes_read; |
| do { |
| #if CPUINFO_MOCK |
| bytes_read = cpuinfo_mock_read(file, data_start, (size_t) (buffer_end - data_start)); |
| #else |
| bytes_read = read(file, data_start, (size_t) (buffer_end - data_start)); |
| #endif |
| if (bytes_read < 0) { |
| cpuinfo_log_info("failed to read file %s at position %zu: %s", |
| filename, position, strerror(errno)); |
| goto cleanup; |
| } |
| |
| position += (size_t) bytes_read; |
| const char* data_end = data_start + (size_t) bytes_read; |
| const char* line_start = buffer; |
| |
| if (bytes_read == 0) { |
| /* No more data in the file: process the remaining text in the buffer as a single entry */ |
| const char* line_end = data_end; |
| if (!callback(line_start, line_end, context, line_number)) { |
| goto cleanup; |
| } |
| } else { |
| const char* line_end; |
| do { |
| /* Find the end of the entry, as indicated by newline character ('\n') */ |
| for (line_end = line_start; line_end != data_end; line_end++) { |
| if (*line_end == '\n') { |
| break; |
| } |
| } |
| |
| /* |
| * If we located separator at the end of the entry, parse it. |
| * Otherwise, there may be more data at the end; read the file once again. |
| */ |
| if (line_end != data_end) { |
| if (!callback(line_start, line_end, context, line_number++)) { |
| goto cleanup; |
| } |
| line_start = line_end + 1; |
| } |
| } while (line_end != data_end); |
| |
| /* Move remaining partial line data at the end to the beginning of the buffer */ |
| const size_t line_length = (size_t) (line_end - line_start); |
| memmove(buffer, line_start, line_length); |
| data_start = &buffer[line_length]; |
| } |
| } while (bytes_read != 0); |
| |
| /* Commit */ |
| status = true; |
| |
| cleanup: |
| if (file != -1) { |
| #if CPUINFO_MOCK |
| cpuinfo_mock_close(file); |
| #else |
| close(file); |
| #endif |
| file = -1; |
| } |
| return status; |
| } |