C ini文件操作示类

/** * @file * @brief initialization file read and write API implementation * @author Deng Yangjun * @date 2007-1-9 * @version 0.2 */ #include <stdio.h> #include <stdlib.h> #include <assert.h> #include <string.h> #include <ctype.h> #include "inifile.h" #ifdef __cplusplus extern "C" { #endif #define MAX_FILE_SIZE 1024*16 #define LEFT_BRACE '[' #define RIGHT_BRACE ']' static int load_ini_file(const char *file, char *buf,int *file_size) { FILE *in = NULL; int i=0; *file_size =0; assert(file !=NULL); assert(buf !=NULL); in = fopen(file,"r"); if( NULL == in) { return 0; } buf[i]=fgetc(in); //load initialization file while( buf[i]!= (char)EOF) { i++; assert( i < MAX_FILE_SIZE ); //file too big, you can redefine MAX_FILE_SIZE to fit the big file buf[i]=fgetc(in); } buf[i]='\0'; *file_size = i; fclose(in); return 1; } static int newline(char c) { return ('\n' == c || '\r' == c )? 1 : 0; } static int end_of_string(char c) { return '\0'==c? 1 : 0; } static int left_barce(char c) { return LEFT_BRACE == c? 1 : 0; } static int isright_brace(char c ) { return RIGHT_BRACE == c? 1 : 0; } static int parse_file(const char *section, const char *key, const char *buf,int *sec_s,int *sec_e, int *key_s,int *key_e, int *value_s, int *value_e) { const char *p = buf; int i=0; assert(buf!=NULL); assert(section != NULL && strlen(section)); assert(key != NULL && strlen(key)); *sec_e = *sec_s = *key_e = *key_s = *value_s = *value_e = -1; while( !end_of_string(p[i]) ) { //find the section if( ( 0==i || newline(p[i-1]) ) && left_barce(p[i]) ) { int section_start=i+1; //find the ']' do { i++; } while( !isright_brace(p[i]) && !end_of_string(p[i])); if( 0 == strncmp(p+section_start,section, i-section_start)) { int newline_start=0; i++; //Skip over space char after ']' while(isspace(p[i])) { i++; } //find the section *sec_s = section_start; *sec_e = i; while( ! (newline(p[i-1]) && left_barce(p[i])) && !end_of_string(p[i]) ) { int j=0; //get a new line newline_start = i; while( !newline(p[i]) && !end_of_string(p[i]) ) { i++; } //now i is equal to end of the line j = newline_start; if(';' != p[j]) //skip over comment { while(j < i && p[j]!='=') { j++; if('=' == p[j]) { if(strncmp(key,p+newline_start,j-newline_start)==0) { //find the key ok *key_s = newline_start; *key_e = j-1; *value_s = j+1; *value_e = i; return 1; } } } } i++; } } } else { i++; } } return 0; } /** *@brief read string in initialization file\n * retrieves a string from the specified section in an initialization file *@param section [in] name of the section containing the key name *@param key [in] name of the key pairs to value *@param value [in] pointer to the buffer that receives the retrieved string *@param size [in] size of result's buffer *@param default_value [in] default value of result *@param file [in] path of the initialization file *@return 1 : read success; \n 0 : read fail */ int read_profile_string( const char *section, const char *key,char *value, int size, const char *default_value, const char *file) { char buf[MAX_FILE_SIZE]={0}; int file_size; int sec_s,sec_e,key_s,key_e, value_s, value_e; //check parameters assert(section != NULL && strlen(section)); assert(key != NULL && strlen(key)); assert(value != NULL); assert(size > 0); assert(file !=NULL &&strlen(key)); if(!load_ini_file(file,buf,&file_size)) { if(default_value!=NULL) { strncpy(value,default_value, size); } return 0; } if(!parse_file(section,key,buf,&sec_s,&sec_e,&key_s,&key_e,&value_s,&value_e)) { if(default_value!=NULL) { strncpy(value,default_value, size); } return 0; //not find the key } else { int cpcount = value_e -value_s; if( size-1 < cpcount) { cpcount = size-1; } memset(value, 0, size); memcpy(value,buf+value_s, cpcount ); value[cpcount] = '\0'; return 1; } } /** *@brief read int value in initialization file\n * retrieves int value from the specified section in an initialization file *@param section [in] name of the section containing the key name *@param key [in] name of the key pairs to value *@param default_value [in] default value of result *@param file [in] path of the initialization file *@return profile int value,if read fail, return default value */ int read_profile_int( const char *section, const char *key,int default_value, const char *file) { char value[32] = {0}; if(!read_profile_string(section,key,value, sizeof(value),NULL,file)) { return default_value; } else { return atoi(value); } } /** * @brief write a profile string to a ini file * @param section [in] name of the section,can't be NULL and empty string * @param key [in] name of the key pairs to value, can't be NULL and empty string * @param value [in] profile string value * @param file [in] path of ini file * @return 1 : success\n 0 : failure */ int write_profile_string(const char *section, const char *key, const char *value, const char *file) { char buf[MAX_FILE_SIZE]={0}; char w_buf[MAX_FILE_SIZE]={0}; int sec_s,sec_e,key_s,key_e, value_s, value_e; int value_len = (int)strlen(value); int file_size; FILE *out; //check parameters assert(section != NULL && strlen(section)); assert(key != NULL && strlen(key)); assert(value != NULL); assert(file !=NULL &&strlen(key)); if(!load_ini_file(file,buf,&file_size)) { sec_s = -1; } else { parse_file(section,key,buf,&sec_s,&sec_e,&key_s,&key_e,&value_s,&value_e); } if( -1 == sec_s) { if(0==file_size) { sprintf(w_buf+file_size,"[%s]\n%s=%s\n",section,key,value); } else { //not find the section, then add the new section at end of the file memcpy(w_buf,buf,file_size); sprintf(w_buf+file_size,"\n[%s]\n%s=%s\n",section,key,value); } } else if(-1 == key_s) { //not find the key, then add the new key=value at end of the section memcpy(w_buf,buf,sec_e); sprintf(w_buf+sec_e,"%s=%s\n",key,value); sprintf(w_buf+sec_e+strlen(key)+strlen(value)+2,buf+sec_e, file_size - sec_e); } else { //update value with new value memcpy(w_buf,buf,value_s); memcpy(w_buf+value_s,value, value_len); memcpy(w_buf+value_s+value_len, buf+value_e, file_size - value_e); } out = fopen(file,"w"); if(NULL == out) { return 0; } if(-1 == fputs(w_buf,out) ) { fclose(out); return 0; } fclose(out); return 1; } #ifdef __cplusplus }; //end of extern "C" { #endif