parse_conf.c

来自「Linux下动态电源管理(Dynamic Power Management)的用」· C语言 代码 · 共 76 行

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

#include "dpmd.h"

static void strchrnull(char *str, int ch)
{
	int i = 0;
	while (str[i]) {
		if (str[i] == ch) {
			str[i] = '\0';
			break;
		}
		i++;
	}
}

int parse_config(const char *filename, struct dpmd_config *config)
{
	FILE *fp;
	char *line;
	ssize_t n, len = 0;
	char *name, *value;

	fp = fopen(filename, "r");
	if (fp == NULL) {
		printf("Cannot open configuration file %s\n", filename);
		exit(-1);
	}

	while ((n = getline(&line, &len, fp)) != -1) {
		if (line[n - 1] == '\n')
			line[n - 1] = '\0';

		/* Because the file format does not know any form of quoting we
		   can search forward for the next ';' character and if found
		   make it terminating the line.  */
		strchrnull (line, '#');

		/* If the line is blank it is ignored.  */
		if (line[0] == '\0')
			continue;

		name = strtok(line, "=");
		value = strtok(NULL, "");

		if (strcmp(name, "POLICY_HIGH") == 0) {
			strncpy(config->policy_high, value, MAX_STR_LEN);
		}
		else if (strcmp(name, "POLICY_LOW") == 0) {
			strncpy(config->policy_low, value, MAX_STR_LEN);
		}
		else if (strcmp(name, "POLL_INTERVAL") == 0) {
			config->poll_interval = strtoul(value, NULL, 10);
		}
		else if (strcmp(name, "SUSPEND_INTERVAL") == 0) {
			config->suspend_interval = strtoul(value, NULL, 10);
		}
		else if (strcmp(name, "CPU_INTERVAL") == 0) {
			strncpy(config->cpu_interval, value, MAX_STR_LEN);
		}
		else if (strcmp(name, "PROGRAMS") == 0) {
			strncpy(config->programs, value, MAX_STR_LEN);
		}
	}

	if (line)
		free (line);
	fclose (fp);

	return 0;
}