纯C语言INI文件解析

小咪咪 2022-08-13 10:59 237阅读 0赞

在一个跨平台（ Android 、Windows、Linux ）项目中配置文件用 INI 格式，自己写了个解析库，纯C语言的，简单好用。

可以解析 INI 格式的字符串、解析文件、保存到文件。

下面是头文件：

**\[cpp\]** [view plain][] [copy][view plain] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  \#ifndef INI\_PARSER\_H
2.  \#define INI\_PARSER\_H
3.  \#ifdef \_\_cplusplus
4.  **extern**"C" \{ 
5.  \#endif
6.  **struct** tag\_value\_list; 
7.  
8.  **struct** ini\_parser \{ 
9.  **struct** tag\_value\_list \* keyvalues; 
10. **int** (\*parse\_file)(**struct** ini\_parser \*, **const****char** \* file); 
11. **int** (\*parse\_string)(**struct** ini\_parser \*, **const****char** \*text); 
12. **char** \* (\*value)(**struct** ini\_parser \*, **const****char** \* key); 
13. **void** (\*set\_value)(**struct** ini\_parser \*, **const****char** \* key, **const****char** \* value); 
14. **void** (\*remove)(**struct** ini\_parser \*, **const****char** \*key); 
15. **int** (\*save\_to\_file)(**struct** ini\_parser \*, **const****char** \* file); 
16. \}; 
17. 
18. **struct** ini\_parser \* new\_ini\_parser(); 
19. **void** delete\_ini\_parser(**struct** ini\_parser \*); 
20. 
21. \#ifdef \_\_cplusplus
22. \} 
23. \#endif
24. \#endif // INI\_PARSER\_H

下面是源文件：

**\[cpp\]** [view plain][] [copy][view plain] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  \#include "ini\_parser.h"
2.  \#include <stdio.h>
3.  \#include <string.h>
4.  \#include "tag\_value.h"
5.  
6.  **static****struct** tag\_value\_pair \* parse\_line(**char** \*line, **int** len) 
7.  \{ 
8.  **struct** tag\_value\_pair \* pair = 0; 
9.  **int** count = 0; 
10. **char** \* p = line; 
11. **char** \* end = 0; 
12. **char** \* start = line; 
13. **if**(!p) **return** 0; 
14. **while**(\*p == ' ') p++; 
15. 
16. 
17. /\*blank line\*/
18. **if**(p - line == len || 
19.  \*p == '\\r' || 
20.  \*p == '\\n' || 
21.  \*p == '\\0') **return** 0; 
22. 
23. /\*do not support group\*/
24. **if**(\*p == '\[') **return** 0; 
25. /\*comments\*/
26. **if**(\*p == '\#') **return** 0; 
27. 
28. /\* extract key \*/
29.  start = p; 
30.  end = line + len; 
31. **while**(\*p != '=' && p!= end) p++; 
32. **if**(p == end) 
33.  \{ 
34. /\* none '=' , invalid line \*/
35. **return** 0; 
36.  \} 
37.  end = p - 1; 
38. **while**(\*end == ' ') end--; /\* skip blank at the end \*/
39.  count = end - start + 1; 
40. 
41.  pair = new\_tag\_value\_pair(); 
42.  pair->szTag = malloc(count + 1); 
43.  strncpy(pair->szTag, start, count); 
44.  pair->szTag\[count\] = 0; 
45. 
46. /\* extract value \*/
47.  p++; 
48.  end = line + len; /\* next pos of the last char \*/
49. **while**( \*p == ' ' && p != end) p++; 
50. **if**(p == end) 
51.  \{ 
52.  delete\_tag\_value\_pair(pair); 
53. **return** 0; 
54.  \} 
55.  start = p; 
56.  end--; /\* to the last char \*/
57. **if**(\*end == '\\n') \{ \*end = 0; end--; \} 
58. **if**(\*end == '\\r') \{ \*end = 0; end--; \} 
59.  count = end - start + 1; 
60. **if**(count > 0) 
61.  \{ 
62.  pair->szValue = malloc(count + 1); 
63.  strncpy(pair->szValue, start, count); 
64.  pair->szValue\[count\] = 0; 
65.  \} 
66. 
67. /\* release empty key-value pair \*/
68. **if**(!pair->szValue) 
69.  \{ 
70.  delete\_tag\_value\_pair(pair); 
71. **return** 0; 
72.  \} 
73. 
74. **return** pair; 
75. \} 
76. 
77. **static****int** \_parse\_file(**struct** ini\_parser \* ini, **const****char** \*file)\{ 
78. **FILE** \* fp = fopen(file, "r"); 
79. **if**(fp) 
80.  \{ 
81. **struct** tag\_value\_pair \* pair = 0; 
82. **char** buf\[1024\] = \{0\}; 
83. **while**(fgets(buf, 1024, fp)) 
84.  \{ 
85.  pair = parse\_line(buf, strlen(buf)); 
86. **if**(pair) 
87.  \{ 
88.  ini->keyvalues->add(ini->keyvalues, pair); 
89.  \} 
90.  \} 
91.  fclose(fp); 
92. **return** ini->keyvalues->size; 
93.  \} 
94. **return** \-1; 
95. \} 
96. 
97. **static****int** \_parse\_text(**struct** ini\_parser \* ini, **const****char** \* text)\{ 
98. **char** \*p = text; 
99. **char** \* start = 0; 
100. **struct** tag\_value\_pair \* pair = 0; 
101. **if**(!text) **return** \-1; 
102. 
103. **while**(1) 
104.  \{ 
105.  start = p; 
106. **while**(\*p != '\\n' && \*p != '\\0' )p++; 
107. **if**(\*p == '\\0') **break**; 
108. 
109.  pair = parse\_line(start, p - start); 
110. **if**(pair) ini->keyvalues->add(ini->keyvalues, pair); 
111. 
112.  p++; 
113.  \} 
114. 
115. **return** ini->keyvalues->size; 
116. \} 
117. 
118. **static****char** \* \_value(**struct** ini\_parser \* ini, **const****char** \* key)\{ 
119. **struct** tag\_value\_pair \* pair = ini->keyvalues->find\_by\_tag(ini->keyvalues, key); 
120. **if**(pair) **return** pair->szValue; 
121. **return** 0; 
122. \} 
123. 
124. **static****void** \_set\_value(**struct** ini\_parser \* ini, **const****char** \* key, **const****char** \*value)\{ 
125. **struct** tag\_value\_pair \* pair = ini->keyvalues->find\_by\_tag(ini->keyvalues, key); 
126. **if**(pair) 
127.  \{ 
128. **if**(pair->szValue) free(pair->szValue); 
129.  pair->szValue = strdup(value); 
130.  \} 
131. **else**
132.  \{ 
133.  ini->keyvalues->add(ini->keyvalues, make\_tag\_value\_pair(key, value)); 
134.  \} 
135. \} 
136. 
137. **static****void** \_remove(**struct** ini\_parser \* ini, **const****char** \* key)\{ 
138. **struct** tag\_value\_pair \* pair = ini->keyvalues->find\_by\_tag(ini->keyvalues, key); 
139. **if**(pair)ini->keyvalues->remove(ini->keyvalues, pair); 
140. \} 
141. 
142. **static****void** write\_keyvalue(**struct** tag\_value\_pair \* pair, **FILE** \*fp) 
143. \{ 
144.  fputs(pair->szTag, fp); 
145.  fputc('=', fp); 
146.  fputs(pair->szValue, fp); 
147.  fputc('\\n', fp); 
148. \} 
149. 
150. **static****int** \_save\_to\_file(**struct** ini\_parser \* ini, **const****char** \* file)\{ 
151. **if**(ini->keyvalues->size > 0) 
152.  \{ 
153. **FILE** \* fp = fopen(file, "w"); 
154. **if**(fp) 
155.  \{ 
156. **struct** tag\_value\_pair \* pair = ini->keyvalues->head; 
157. **while**(pair != ini->keyvalues->tail) 
158.  \{ 
159.  write\_keyvalue(pair, fp); 
160.  pair = pair->next; 
161.  \} 
162. 
163. **if**(pair)write\_keyvalue(pair, fp); 
164. 
165.  fclose(fp); 
166. **return** 0; 
167.  \} 
168.  \} 
169. **return** \-1; 
170. \} 
171. 
172. **struct** ini\_parser \* new\_ini\_parser()\{ 
173. **struct** ini\_parser \* ini = (**struct** ini\_parser\*)malloc(**sizeof**(**struct** ini\_parser)); 
174.  ini->keyvalues = new\_tag\_value\_list(); 
175.  ini->parse\_file = \_parse\_file; 
176.  ini->parse\_string = \_parse\_text; 
177.  ini->value = \_value; 
178.  ini->set\_value = \_set\_value; 
179.  ini->remove = \_remove; 
180.  ini->save\_to\_file = \_save\_to\_file; 
181. **return** ini; 
182. \} 
183. 
184. **void** delete\_ini\_parser(**struct** ini\_parser \*ini)\{ 
185. **if**(ini) 
186.  \{ 
187.  delete\_tag\_value\_list(ini->keyvalues); 
188.  free(ini); 
189.  \} 
190. \}

测试代码：

**\[cpp\]** [view plain][] [copy][view plain] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  \#include "util/ini\_parser.h"
2.  \#include "ini\_test.h"
3.  \#include <stdio.h>
4.  \#include <assert.h>
5.  
6.  **static****char** \* g\_szIniString = "\#abc\\nfirst=2\\nsecond\\nname=charli zhang \\n"; 
7.  
8.  **static****void** ini\_parser\_test\_string() 
9.  \{ 
10. **struct** ini\_parser \* ini = new\_ini\_parser(); 
11. **int** size = ini->parse\_string(ini, g\_szIniString); 
12. 
13.  assert( size > 0); 
14.  assert( ini->value(ini, "second") == 0 ); 
15.  assert( ini->value(ini, "abc") == 0); 
16.  assert( ini->value(ini, "name") != NULL ); 
17.  assert( ini->value(ini, "first") != NULL); 
18. 
19.  printf("ini string: %s\\n", g\_szIniString); 
20.  printf("key-value pairs count = %d\\n", size); 
21.  printf("key \\'name\\'', value = %s\\n", ini->value(ini, "name")); 
22.  printf("key \\'first\\'', value = %s\\n", ini->value(ini, "first")); 
23. 
24.  ini->set\_value(ini, "baidu", "hahaha"); 
25.  ini->save\_to\_file(ini, "write.conf"); 
26. 
27.  ini->remove(ini, "first"); 
28.  ini->save\_to\_file(ini, "write2.conf"); 
29. 
30.  delete\_ini\_parser(ini); 
31. \} 
32. 
33. **static****void** ini\_parser\_test\_file() 
34. \{ 
35. **struct** ini\_parser \* ini = new\_ini\_parser(); 
36. **int** size = ini->parse\_file(ini, "test.conf"); 
37. 
38.  assert( size > 0); 
39.  assert( ini->value(ini, "second") == 0 ); 
40.  assert( ini->value(ini, "abc") == 0); 
41.  assert( ini->value(ini, "name") != NULL ); 
42.  assert( ini->value(ini, "first") != NULL); 
43. 
44.  printf("ini string: %s\\n", g\_szIniString); 
45.  printf("key-value pairs count = %d\\n", size); 
46.  printf("key \\'name\\'', value = %s\\n", ini->value(ini, "name")); 
47.  printf("key \\'first\\'', value = %s\\n", ini->value(ini, "first")); 
48.  printf("key \\'baidu\\'', value = %s\\n", ini->value(ini, "baidu")); 
49. 
50.  delete\_ini\_parser(ini); 
51. \} 
52. 
53. **void** ini\_parser\_test() 
54. \{ 
55.  ini\_parser\_test\_string(); 
56.  ini\_parser\_test\_file(); 
57. \}

测试了解析字符串、文件、增、删、写文件，都没什么大问题。

[view plain]: http://blog.csdn.net/foruok/article/details/17715969#
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