1.#include <stdio.h>
2.#include <unistd.h>
3.#include <fcntl.h>
4.#include <string.h>
5.#include <malloc.h>
6.#include <stdlib.h>
7.
8.
9.typedef struct item_t {
10. char *key;
11. char *value;
12.}ITEM;
13.
14./*
15. *去除字符串右端空格
16. */
17.char *strtrimr(char *pstr)
18.{
19. int i;
20. i = strlen(pstr) - 1;
21. while (isspace(pstr[i]) && (i >= 0))
22. pstr[i--] = '\0';
23. return pstr;
24.}
25./*
26. *去除字符串左端空格
27. */
28.char *strtriml(char *pstr)
29.{
30. int i = 0,j;
31. j = strlen(pstr) - 1;
32. while (isspace(pstr[i]) && (i <= j))
33. i++;
34. if (0<i)
35. strcpy(pstr, &pstr[i]);
36. return pstr;
37.}
38./*
39. *去除字符串两端空格
40. */
41.char *strtrim(char *pstr)
42.{
43. char *p;
44. p = strtrimr(pstr);
45. return strtriml(p);
46.}
47.
48.
49./*
50. *从配置文件的一行读出key或value,返回item指针
51. *line--从配置文件读出的一行
52. */
53.int get_item_from_line(char *line, struct item_t *item)
54.{
55. char *p = strtrim(line);
56. int len = strlen(p);
57. if(len <= 0){
58. return 1;//空行
59. }
60. else if(p[0]=='#'){
61. return 2;
62. }else{
63. char *p2 = strchr(p, '=');
64. *p2++ = '\0';
65. item->key = (char *)malloc(strlen(p) + 1);
66. item->value = (char *)malloc(strlen(p2) + 1);
67. strcpy(item->key,p);
68. strcpy(item->value,p2);
69.
70. }
71. return 0;//查询成功
72.}
73.
74.int file_to_items(const char *file, struct item_t *items, int *num)
75.{
76. char line[1024];
77. FILE *fp;
78. fp = fopen(file,"r");
79. if(fp == NULL)
80. return 1;
81. int i = 0;
82. while(fgets(line, 1023, fp))
83. {
84. char *p = strtrim(line);
85. int len = strlen(p);
86. if(len <= 0)
87. {
88. continue;
89. }
90. else if(p[0]=='#')
91. {
92. continue;
93. }
94. else
95. {
96. char *p2 = strchr(p, '=');
97. /*这里认为只有key没什么意义*/
98. if(p2 == NULL)
99. continue;
100. *p2++ = '\0';
101. items[i].key = (char *)malloc(strlen(p) + 1);
102. items[i].value = (char *)malloc(strlen(p2) + 1);
103. strcpy(items[i].key,p);
104. strcpy(items[i].value,p2);
105.
106. i++;
107. }
108. }
109. (*num) = i;
110. fclose(fp);
111. return 0;
112.}
113.
114./*
115. *读取value
116. */
117.int read_conf_value(const char *key,char *value1,const char *file)
118.{
119. char line[1024];
120. char *key1,*key3,*key2;
121. FILE *fp;
122. fp = fopen(file,"r");
123. if(fp == NULL)
124. return 1;//文件打开错误
125. while (fgets(line, 1023, fp)){
126. ITEM item;
127. get_item_from_line(line,&item);
128. if(!strcmp(item.key,key)){
129.
130. strcpy(value1,item.value);
131. fclose(fp);
132. free(item.key);
133. free(item.value);
134. break;
135. }
136. }
137. return 0;//成功
138.
139.}
140.int write_conf_value(const char *key,char *value,const char *file)
141.{
142. ITEM items[20];// 假定配置项最多有20个
143. int num;//存储从文件读取的有效数目
144. file_to_items(file, items, &num);
145.
146. int i=0;
147. //查找要修改的项
148. for(i=0;i<num;i++){
149. if(!strcmp(items[i].key, key)){
150. items[i].value = value;
151. break;
152. }
153. }
154.
155. // 更新配置文件,应该有备份，下面的操作会将文件内容清除
156. FILE *fp;
157. fp = fopen(file, "w");
158. if(fp == NULL)
159. return 1;
160.
161. i=0;
162. for(i=0;i<num;i++){
163. fprintf(fp,"%s=%s\n",items[i].key, items[i].value);
164. //printf("%s=%s\n",items[i].key, items[i].value);
165. }
166. fclose(fp);
167. //清除工作
168. /*i=0;
169. for(i=0;i<num;i++){
170. free(items[i].key);
171. free(items[i].value);
172. }*/
173.
174. return 0;
175.
176.}
177.
178.void main(void)
179.{
180. char *key;
181. char *value=NULL,*value1=NULL;
182. char *file;
183. file="/home/wangwei/ww/file/from_file";
184.
185. key="IP";
186. value=(char *)malloc(sizeof(char)*30);
187. value1=(char *)malloc(sizeof(char)*30);
188. read_conf_value(key,value,file);
189. printf("IP = %s\n",value);
190.
191. key="MASK";
192. read_conf_value(key,value,file);
193. printf("MASK = %s\n",value);
194.
195. key="GATEWAY";
196. read_conf_value(key,value,file);
197. printf("GATEWAY = %s\n",value);
198. free(value);
199. free(value1);
200. value=NULL;
201. value1=NULL;
202.}