C语言解析Ini格式文件
皇甫德庸
引用别人的博文： http://www.open-open.com/lib/view/open1402278076447.html
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：
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
25 下面是源文件：
26 #include "ini_parser.h"
27 #include <stdio.h>
28 #include <string.h>
29 #include "tag_value.h"
30
31 static struct tag_value_pair * parse_line(char *line, int len)
32 {
33 struct tag_value_pair * pair = 0;
34 int count = 0;
35 char * p = line;
36 char * end = 0;
37 char * start = line;
38 if(!p) return 0;
39 while(*p == ' ') p++;
40
41
42 /*blank line*/
43 if(p - line == len ||
44 *p == '\r' ||
45 *p == '\n' ||
46 *p == '\0') return 0;
47
48 /*do not support group*/
49 if(*p == '[') return 0;
50 /*comments*/
51 if(*p == '#') return 0;
52
53 /* extract key */
54 start = p;
55 end = line + len;
56 while(*p != '=' && p!= end) p++;
57 if(p == end)
58 {
59 /* none '=' , invalid line */
60 return 0;
61 }
62 end = p - 1;
63 while(*end == ' ') end--; /* skip blank at the end */
64 count = end - start + 1;
65
66 pair = new_tag_value_pair();
67 pair->szTag = malloc(count + 1);
68 strncpy(pair->szTag, start, count);
69 pair->szTag[count] = 0;
70
71 /* extract value */
72 p++;
73 end = line + len; /* next pos of the last char */
74 while( *p == ' ' && p != end) p++;
75 if(p == end)
76 {
77 delete_tag_value_pair(pair);
78 return 0;
79 }
80 start = p;
81 end--; /* to the last char */
82 if(*end == '\n') { *end = 0; end--; }
83 if(*end == '\r') { *end = 0; end--; }
84 count = end - start + 1;
85 if(count > 0)
86 {
87 pair->szValue = malloc(count + 1);
88 strncpy(pair->szValue, start, count);
89 pair->szValue[count] = 0;
90 }
91
92 /* release empty key-value pair */
93 if(!pair->szValue)
94 {
95 delete_tag_value_pair(pair);
96 return 0;
97 }
98
99 return pair;
100 }
101
102 static int _parse_file(struct ini_parser * ini, const char *file){
103 FILE * fp = fopen(file, "r");
104 if(fp)
105 {
106 struct tag_value_pair * pair = 0;
107 char buf[1024] = {0};
108 while(fgets(buf, 1024, fp))
109 {
110 pair = parse_line(buf, strlen(buf));
111 if(pair)
112 {
113 ini->keyvalues->add(ini->keyvalues, pair);
114 }
115 }
116 fclose(fp);
117 return ini->keyvalues->size;
118 }
119 return -1;
120 }
121
122 static int _parse_text(struct ini_parser * ini, const char * text){
123 char *p = text;
124 char * start = 0;
125 struct tag_value_pair * pair = 0;
126 if(!text) return -1;
127
128 while(1)
129 {
130 start = p;
131 while(*p != '\n' && *p != '\0' )p++;
132 if(*p == '\0') break;
133
134 pair = parse_line(start, p - start);
135 if(pair) ini->keyvalues->add(ini->keyvalues, pair);
136
137 p++;
138 }
139
140 return ini->keyvalues->size;
141 }
142
143 static char * _value(struct ini_parser * ini, const char * key){
144 struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
145 if(pair) return pair->szValue;
146 return 0;
147 }
148
149 static void _set_value(struct ini_parser * ini, const char * key, const char *value){
150 struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
151 if(pair)
152 {
153 if(pair->szValue) free(pair->szValue);
154 pair->szValue = strdup(value);
155 }
156 else
157 {
158 ini->keyvalues->add(ini->keyvalues, make_tag_value_pair(key, value));
159 }
160 }
161
162 static void _remove(struct ini_parser * ini, const char * key){
163 struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
164 if(pair)ini->keyvalues->remove(ini->keyvalues, pair);
165 }
166
167 static void write_keyvalue(struct tag_value_pair * pair, FILE *fp)
168 {
169 fputs(pair->szTag, fp);
170 fputc('=', fp);
171 fputs(pair->szValue, fp);
172 fputc('\n', fp);
173 }
174
175 static int _save_to_file(struct ini_parser * ini, const char * file){
176 if(ini->keyvalues->size > 0)
177 {
178 FILE * fp = fopen(file, "w");
179 if(fp)
180 {
181 struct tag_value_pair * pair = ini->keyvalues->head;
182 while(pair != ini->keyvalues->tail)
183 {
184 write_keyvalue(pair, fp);
185 pair = pair->next;
186 }
187
188 if(pair)write_keyvalue(pair, fp);
189
190 fclose(fp);
191 return 0;
192 }
193 }
194 return -1;
195 }
196
197 struct ini_parser * new_ini_parser(){
198 struct ini_parser * ini = (struct ini_parser*)malloc(sizeof(struct ini_parser));
199 ini->keyvalues = new_tag_value_list();
200 ini->parse_file = _parse_file;
201 ini->parse_string = _parse_text;
202 ini->value = _value;
203 ini->set_value = _set_value;
204 ini->remove = _remove;
205 ini->save_to_file = _save_to_file;
206 return ini;
207 }
208
209 void delete_ini_parser(struct ini_parser *ini){
210 if(ini)
211 {
212 delete_tag_value_list(ini->keyvalues);
213 free(ini);
214 }
215 }
216 测试代码：
217 #include "util/ini_parser.h"
218 #include "ini_test.h"
219 #include <stdio.h>
220 #include <assert.h>
221
222 static char * g_szIniString = "#abc\nfirst=2\nsecond\nname=charli zhang \n";
223
224 static void ini_parser_test_string()
225 {
226 struct ini_parser * ini = new_ini_parser();
227 int size = ini->parse_string(ini, g_szIniString);
228
229 assert( size > 0);
230 assert( ini->value(ini, "second") == 0 );
231 assert( ini->value(ini, "abc") == 0);
232 assert( ini->value(ini, "name") != NULL );
233 assert( ini->value(ini, "first") != NULL);
234
235 printf("ini string: %s\n", g_szIniString);
236 printf("key-value pairs count = %d\n", size);
237 printf("key \'name\'', value = %s\n", ini->value(ini, "name"));
238 printf("key \'first\'', value = %s\n", ini->value(ini, "first"));
239
240 ini->set_value(ini, "baidu", "hahaha");
241 ini->save_to_file(ini, "write.conf");
242
243 ini->remove(ini, "first");
244 ini->save_to_file(ini, "write2.conf");
245
246 delete_ini_parser(ini);
247 }
248
249 static void ini_parser_test_file()
250 {
251 struct ini_parser * ini = new_ini_parser();
252 int size = ini->parse_file(ini, "test.conf");
253
254 assert( size > 0);
255 assert( ini->value(ini, "second") == 0 );
256 assert( ini->value(ini, "abc") == 0);
257 assert( ini->value(ini, "name") != NULL );
258 assert( ini->value(ini, "first") != NULL);
259
260 printf("ini string: %s\n", g_szIniString);
261 printf("key-value pairs count = %d\n", size);
262 printf("key \'name\'', value = %s\n", ini->value(ini, "name"));
263 printf("key \'first\'', value = %s\n", ini->value(ini, "first"));
264 printf("key \'baidu\'', value = %s\n", ini->value(ini, "baidu"));
265
266 delete_ini_parser(ini);
267 }
268
269 void ini_parser_test()
270 {
271 ini_parser_test_string();
272 ini_parser_test_file();
273 }
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