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#include <stdbool.h> |
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#include <stdint.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <alloca.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#if CPUINFO_MOCK |
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#include <cpuinfo-mock.h> |
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#endif |
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#include <linux/api.h> |
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#include <cpuinfo/log.h> |
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bool cpuinfo_linux_parse_multiline_file(const char* filename, size_t buffer_size, cpuinfo_line_callback callback, void* context) |
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{ |
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int file = -1; |
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bool status = false; |
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char* buffer = (char*) alloca(buffer_size); |
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#if CPUINFO_MOCK |
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file = cpuinfo_mock_open(filename, O_RDONLY); |
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#else |
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file = open(filename, O_RDONLY); |
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#endif |
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if (file == -1) { |
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cpuinfo_log_info("failed to open %s: %s", filename, strerror(errno)); |
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goto cleanup; |
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} |
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size_t position = 0; |
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uint64_t line_number = 1; |
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const char* buffer_end = &buffer[buffer_size]; |
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char* data_start = buffer; |
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ssize_t bytes_read; |
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do { |
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#if CPUINFO_MOCK |
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bytes_read = cpuinfo_mock_read(file, data_start, (size_t) (buffer_end - data_start)); |
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#else |
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bytes_read = read(file, data_start, (size_t) (buffer_end - data_start)); |
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#endif |
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if (bytes_read < 0) { |
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cpuinfo_log_info("failed to read file %s at position %zu: %s", |
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filename, position, strerror(errno)); |
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goto cleanup; |
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} |
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position += (size_t) bytes_read; |
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const char* data_end = data_start + (size_t) bytes_read; |
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const char* line_start = buffer; |
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if (bytes_read == 0) { |
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const char* line_end = data_end; |
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if (!callback(line_start, line_end, context, line_number)) { |
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goto cleanup; |
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} |
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} else { |
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const char* line_end; |
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do { |
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for (line_end = line_start; line_end != data_end; line_end++) { |
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if (*line_end == '\n') { |
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break; |
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} |
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} |
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if (line_end != data_end) { |
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if (!callback(line_start, line_end, context, line_number++)) { |
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goto cleanup; |
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} |
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line_start = line_end + 1; |
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} |
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} while (line_end != data_end); |
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const size_t line_length = (size_t) (line_end - line_start); |
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memmove(buffer, line_start, line_length); |
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data_start = &buffer[line_length]; |
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} |
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} while (bytes_read != 0); |
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status = true; |
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cleanup: |
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if (file != -1) { |
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#if CPUINFO_MOCK |
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cpuinfo_mock_close(file); |
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#else |
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close(file); |
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#endif |
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file = -1; |
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} |
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return status; |
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} |
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