linux 读写配置文件 c程序实现

int WritePrivateProfileString(char *section,char *key,char *val,char *filePath) { char retval[128]; if(GetPrivateProfileString(section,key,retval,20,filePath)==0) if(strcmp(val,retval)==0) return 0; FILE *file; char buf1[4096]; char buf2[128]; char *ptr1=NULL; memset(buf1,'\0',4096); memset(buf2,'\0',128); if((file = fopen(filePath,"r"))==NULL) { perror("fopen"); exit(-1); } while(fread(buf1,sizeof(buf1),1,file) != 0); fclose(file); char *ptr[512]; char *tmp=NULL; int i = 0,j,flag=0; ptr[i]=strtok(buf1,"\r\n"); while((ptr[++i]=strtok(NULL,"\r\n")) != NULL); for(j=0;j<i;j++) { if(strstr(ptr[j],section)==NULL) continue; else j++; for(;((j<i) && (*ptr[j] != '['));j++) { if(strstr(ptr[j],key) != NULL) { strcat(buf2,key);strcat(buf2,"="); strcat(buf2,val); ptr[j]=buf2; } } } #ifdef DEBUG for(j=0;j < i;j++) printf("%s\n",ptr[j]); #endif if((file = fopen(filePath,"w+"))==NULL) { perror("fopen"); exit(-1); } for(j=0;j<i;j++) { fputs(ptr[j],file); fputc('\r',file); fputc('\n',file); } fclose(file); return 0; }