File size: 1,699 Bytes
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#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 <cpuinfo/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;
}
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