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：
#ifndef INI_PARSER_H
#define INI_PARSER_H
#ifdef __cplusplus
extern "C" {
#endif
struct tag_value_list; struct ini_parser {
struct tag_value_list * keyvalues;
int (*parse_file)(struct ini_parser *, const char * file);
int (*parse_string)(struct ini_parser *, const char *text);
char * (*value)(struct ini_parser *, const char * key);
void (*set_value)(struct ini_parser *, const char * key, const char * value);
void (*remove)(struct ini_parser *, const char *key);
int (*save_to_file)(struct ini_parser *, const char * file);
}; struct ini_parser * new_ini_parser();
void delete_ini_parser(struct ini_parser *); #ifdef __cplusplus
}
#endif
#endif // INI_PARSER_H
下面是源文件：
#include "ini_parser.h"
#include <stdio.h>
#include <string.h>
#include "tag_value.h" static struct tag_value_pair * parse_line(char *line, int len)
{
struct tag_value_pair * pair = ;
int count = ;
char * p = line;
char * end = ;
char * start = line;
if(!p) return ;
while(*p == ' ') p++; /*blank line*/
if(p - line == len ||
*p == '\r' ||
*p == '\n' ||
*p == '\0') return ; /*do not support group*/
if(*p == '[') return ;
/*comments*/
if(*p == '#') return ; /* extract key */
start = p;
end = line + len;
while(*p != '=' && p!= end) p++;
if(p == end)
{
/* none '=' , invalid line */
return ;
}
end = p - ;
while(*end == ' ') end--; /* skip blank at the end */
count = end - start + ; pair = new_tag_value_pair();
pair->szTag = malloc(count + );
strncpy(pair->szTag, start, count);
pair->szTag[count] = ; /* extract value */
p++;
end = line + len; /* next pos of the last char */
while( *p == ' ' && p != end) p++;
if(p == end)
{
delete_tag_value_pair(pair);
return ;
}
start = p;
end--; /* to the last char */
if(*end == '\n') { *end = ; end--; }
if(*end == '\r') { *end = ; end--; }
count = end - start + ;
if(count > )
{
pair->szValue = malloc(count + );
strncpy(pair->szValue, start, count);
pair->szValue[count] = ;
} /* release empty key-value pair */
if(!pair->szValue)
{
delete_tag_value_pair(pair);
return ;
} return pair;
} static int _parse_file(struct ini_parser * ini, const char *file){
FILE * fp = fopen(file, "r");
if(fp)
{
struct tag_value_pair * pair = ;
char buf[] = {};
while(fgets(buf, , fp))
{
pair = parse_line(buf, strlen(buf));
if(pair)
{
ini->keyvalues->add(ini->keyvalues, pair);
}
}
fclose(fp);
return ini->keyvalues->size;
}
return -;
} static int _parse_text(struct ini_parser * ini, const char * text){
char *p = text;
char * start = ;
struct tag_value_pair * pair = ;
if(!text) return -; while()
{
start = p;
while(*p != '\n' && *p != '\0' )p++;
if(*p == '\0') break; pair = parse_line(start, p - start);
if(pair) ini->keyvalues->add(ini->keyvalues, pair); p++;
} return ini->keyvalues->size;
} static char * _value(struct ini_parser * ini, const char * key){
struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
if(pair) return pair->szValue;
return ;
} static void _set_value(struct ini_parser * ini, const char * key, const char *value){
struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
if(pair)
{
if(pair->szValue) free(pair->szValue);
pair->szValue = strdup(value);
}
else
{
ini->keyvalues->add(ini->keyvalues, make_tag_value_pair(key, value));
}
} static void _remove(struct ini_parser * ini, const char * key){
struct tag_value_pair * pair = ini->keyvalues->find_by_tag(ini->keyvalues, key);
if(pair)ini->keyvalues->remove(ini->keyvalues, pair);
} static void write_keyvalue(struct tag_value_pair * pair, FILE *fp)
{
fputs(pair->szTag, fp);
fputc('=', fp);
fputs(pair->szValue, fp);
fputc('\n', fp);
} static int _save_to_file(struct ini_parser * ini, const char * file){
if(ini->keyvalues->size > )
{
FILE * fp = fopen(file, "w");
if(fp)
{
struct tag_value_pair * pair = ini->keyvalues->head;
while(pair != ini->keyvalues->tail)
{
write_keyvalue(pair, fp);
pair = pair->next;
} if(pair)write_keyvalue(pair, fp); fclose(fp);
return ;
}
}
return -;
} struct ini_parser * new_ini_parser(){
struct ini_parser * ini = (struct ini_parser*)malloc(sizeof(struct ini_parser));
ini->keyvalues = new_tag_value_list();
ini->parse_file = _parse_file;
ini->parse_string = _parse_text;
ini->value = _value;
ini->set_value = _set_value;
ini->remove = _remove;
ini->save_to_file = _save_to_file;
return ini;
} void delete_ini_parser(struct ini_parser *ini){
if(ini)
{
delete_tag_value_list(ini->keyvalues);
free(ini);
}
}
测试代码：
#include "util/ini_parser.h"
#include "ini_test.h"
#include <stdio.h>
#include <assert.h> static char * g_szIniString = "#abc\nfirst=2\nsecond\nname=charli zhang \n"; static void ini_parser_test_string()
{
struct ini_parser * ini = new_ini_parser();
int size = ini->parse_string(ini, g_szIniString); assert( size > );
assert( ini->value(ini, "second") == );
assert( ini->value(ini, "abc") == );
assert( ini->value(ini, "name") != NULL );
assert( ini->value(ini, "first") != NULL); printf("ini string: %s\n", g_szIniString);
printf("key-value pairs count = %d\n", size);
printf("key \'name\'', value = %s\n", ini->value(ini, "name"));
printf("key \'first\'', value = %s\n", ini->value(ini, "first")); ini->set_value(ini, "baidu", "hahaha");
ini->save_to_file(ini, "write.conf"); ini->remove(ini, "first");
ini->save_to_file(ini, "write2.conf"); delete_ini_parser(ini);
} static void ini_parser_test_file()
{
struct ini_parser * ini = new_ini_parser();
int size = ini->parse_file(ini, "test.conf"); assert( size > );
assert( ini->value(ini, "second") == );
assert( ini->value(ini, "abc") == );
assert( ini->value(ini, "name") != NULL );
assert( ini->value(ini, "first") != NULL); printf("ini string: %s\n", g_szIniString);
printf("key-value pairs count = %d\n", size);
printf("key \'name\'', value = %s\n", ini->value(ini, "name"));
printf("key \'first\'', value = %s\n", ini->value(ini, "first"));
printf("key \'baidu\'', value = %s\n", ini->value(ini, "baidu")); delete_ini_parser(ini);
} void ini_parser_test()
{
ini_parser_test_string();
ini_parser_test_file();
}