1 #include <stdbool.h>
2 #include <stdint.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <alloca.h>
6 #include <errno.h>
7
8 #include <sys/types.h>
9 #include <sys/stat.h>
10 #include <unistd.h>
11 #include <fcntl.h>
12
13 #if CPUINFO_MOCK
14 #include <cpuinfo-mock.h>
15 #endif
16 #include <linux/api.h>
17 #include <cpuinfo/log.h>
18
19
cpuinfo_linux_parse_small_file(const char * filename,size_t buffer_size,cpuinfo_smallfile_callback callback,void * context)20 bool cpuinfo_linux_parse_small_file(const char* filename, size_t buffer_size, cpuinfo_smallfile_callback callback, void* context) {
21 int file = -1;
22 bool status = false;
23 char* buffer = (char*) alloca(buffer_size);
24
25 #if CPUINFO_LOG_DEBUG_PARSERS
26 cpuinfo_log_debug("parsing small file %s", filename);
27 #endif
28
29 #if CPUINFO_MOCK
30 file = cpuinfo_mock_open(filename, O_RDONLY);
31 #else
32 file = open(filename, O_RDONLY);
33 #endif
34 if (file == -1) {
35 cpuinfo_log_info("failed to open %s: %s", filename, strerror(errno));
36 goto cleanup;
37 }
38
39 size_t buffer_position = 0;
40 ssize_t bytes_read;
41 do {
42 #if CPUINFO_MOCK
43 bytes_read = cpuinfo_mock_read(file, &buffer[buffer_position], buffer_size - buffer_position);
44 #else
45 bytes_read = read(file, &buffer[buffer_position], buffer_size - buffer_position);
46 #endif
47 if (bytes_read < 0) {
48 cpuinfo_log_info("failed to read file %s at position %zu: %s", filename, buffer_position, strerror(errno));
49 goto cleanup;
50 }
51 buffer_position += (size_t) bytes_read;
52 if (buffer_position >= buffer_size) {
53 cpuinfo_log_error("failed to read file %s: insufficient buffer of size %zu", filename, buffer_size);
54 goto cleanup;
55 }
56 } while (bytes_read != 0);
57
58 status = callback(buffer, &buffer[buffer_position], context);
59
60 cleanup:
61 if (file != -1) {
62 #if CPUINFO_MOCK
63 cpuinfo_mock_close(file);
64 #else
65 close(file);
66 #endif
67 file = -1;
68 }
69 return status;
70 }
71