| #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_small_file(const char* filename, size_t buffer_size, cpuinfo_smallfile_callback callback, void* context) { |
| int file = -1; |
| bool status = false; |
| char* buffer = (char*) alloca(buffer_size); |
| |
| #if CPUINFO_LOG_DEBUG_PARSERS |
| cpuinfo_log_debug("parsing small file %s", filename); |
| #endif |
| |
| #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; |
| } |
| |
| size_t buffer_position = 0; |
| ssize_t bytes_read; |
| do { |
| #if CPUINFO_MOCK |
| bytes_read = cpuinfo_mock_read(file, &buffer[buffer_position], buffer_size - buffer_position); |
| #else |
| bytes_read = read(file, &buffer[buffer_position], buffer_size - buffer_position); |
| #endif |
| if (bytes_read < 0) { |
| cpuinfo_log_info("failed to read file %s at position %zu: %s", filename, buffer_position, strerror(errno)); |
| goto cleanup; |
| } |
| buffer_position += (size_t) bytes_read; |
| if (buffer_position >= buffer_size) { |
| cpuinfo_log_error("failed to read file %s: insufficient buffer of size %zu", filename, buffer_size); |
| goto cleanup; |
| } |
| } while (bytes_read != 0); |
| |
| status = callback(buffer, &buffer[buffer_position], context); |
| |
| cleanup: |
| if (file != -1) { |
| #if CPUINFO_MOCK |
| cpuinfo_mock_close(file); |
| #else |
| close(file); |
| #endif |
| file = -1; |
| } |
| return status; |
| } |