uint64_t get_interrupts_from_proc_by_dev()

in src/oscounter.c [83:121]

• 33 lines of code
• 8 McCabe index (conditional complexity)

uint64_t get_interrupts_from_proc_by_dev(char *dev_name)
{
	FILE *file = fopen(PROC_FILE_INTERRUPTS, "r");
	if (file == NULL) {
		PRINT_ERR("Cannot open /proc/interrupts");
		return 0;
	}
	if (!strcmp(dev_name, ""))
		return 0;

	/* the max number of chars in each line = 64 + 12 chars/cpu * 1024 cpus + 128 = 12,480 */
	char buffer[12480];
	char *line;
	char *value;
	uint64_t interrupts = 0;
	uint64_t total_interrupts = 0;
	while ((line = fgets(buffer, 12480, file)) != NULL) {
		if (strstr(line, dev_name) == NULL) {
			continue;
		}

		value = strtok(line, " ");
		while (value != NULL) {
			if (!is_str_number(value)) {
				/* go to next element ("value")  */
				value = strtok(NULL, " ");
				continue;
			}
			errno = 0;
			interrupts = strtoull(value, NULL, 10);
			total_interrupts += (errno == 0) ? interrupts : 0;
			/* go to next element ("value")  */
			value = strtok(NULL, " ");
		}
	}
	fclose(file);

	return total_interrupts;
}