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#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/api.h>
#include <log.h>
inline static const char* parse_number(const char* string, const char* end, uint32_t number_ptr[restrict static 1]) {
uint32_t number = 0;
while (string != end) {
const uint32_t digit = (uint32_t) (*string) - (uint32_t) '0';
if (digit >= 10) {
return string;
}
number = number * UINT32_C(10) + digit;
string += 1;
}
*number_ptr = number;
return end;
}
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
file = open(filename, O_RDONLY);
if (file == -1) {
cpuinfo_log_error("failed to open %s: %s", filename, strerror(errno));
goto cleanup;
}
char* buffer_end = &buffer[buffer_size];
size_t buffer_position = 0;
ssize_t bytes_read;
do {
bytes_read = read(file, &buffer[buffer_position], buffer_size - buffer_position);
if (bytes_read < 0) {
cpuinfo_log_error("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) {
close(file);
file = -1;
}
return status;
}
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