簡單CD管理器【學習c】

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <string.h>const char* CD_LIST = "cds.txt";const char* MUSIC_LIST = "musics.txt";const char* TEMP_FILE = "temp.txt";const int NOSELECT = -1;const int MAX_NAME = 30;const int MAX_LINE = 100;int mselect = -1;char mselectcd[100];void welcome(){printf("Welcome to Simple CD Manager\n");printf("author : lize\n");}void showcdsmenu(){printf("please input your choice:\n");printf("c     create a new cd\n");printf("l     list all cds\n");printf("s     select a cd\n");printf("q     quit\n");}void showmusicsmenu(){printf("you selected %s\n" , mselectcd);printf("please input your choice:\n");printf("a     add a new music\n");printf("r     remove a music\n");printf("d     delete the cd\n");printf("l     list musics in the cd \n");printf("b     back to cd lists\n");printf("q     quit\n");}void ffllushstdin(){int c;        while ((c=getchar()) != '\n' && c != EOF);//setbuf(stdin , NULL);   沒啥用。看完當上說是能將流緩衝區的資料清空。可是使用發現不僅沒效果，緩衝區的資料卻亂了。}void getinputc(char* input){printf("?");scanf(" %c",input);}void getinputi(int* input){printf("?");scanf(" %d",input);}void getinputs(char* name , const int length){printf("?");ffllushstdin();fgets(name , length , stdin);}void removenline(const char* str){char* ptr;ptr = str;if(*ptr == 0 ) return;while(*ptr != 0){ptr++;}ptr--;if(*ptr == '\n'){*ptr = 0;}}int getmaxno(const char* name){FILE *file;char line[MAX_LINE];int maxno = 0;file=fopen(name,"r");if(NULL != file){fgets(line,MAX_LINE,file);while(!feof(file)){sscanf(line," %d\n",&maxno);fgets(line,MAX_LINE,file);}fclose(file);}return maxno;}void searchno(const int no , const char* filename){FILE *file;int i;char line[MAX_LINE];file=fopen(filename,"r");if(NULL != file){fgets(line,MAX_LINE,file);while(!feof(file)){if(1 == sscanf(line,"%d",&i ) && i == no){mselect = no;strcpy(mselectcd , line);break;}fgets(line,MAX_LINE,file);}fclose(file);}if(mselect == NOSELECT){printf("not found!");}}void quit(){exit(EXIT_SUCCESS);}void createcd(){char name[MAX_NAME];FILE *file;int no;printf("please input the name of your cd : \n");getinputs(name , MAX_NAME);no = getmaxno(CD_LIST) +1 ;if(1 == no){file = fopen(CD_LIST , "w");}else{file = fopen(CD_LIST , "a");}fprintf(file,"%d,%s",no,name);    fclose(file);}void listcds(){FILE* file;int no;char line[MAX_LINE];file = fopen(CD_LIST , "r");if(NULL == file ) printf("no cd ! \n");else {fgets(line,MAX_LINE,file);while(!feof(file)){printf("%s",line);fgets(line,MAX_LINE,file);}fclose(file);}}void selectcd(){int no;printf("please input the no \n");getinputi(&no);searchno(no,CD_LIST);}void cdmanager(){char c;showcdsmenu();getinputc(&c);switch(c){case 'c':createcd();break;case 'l':listcds();break;case 's':selectcd();break;case 'q':quit();break;default:printf("error input\n");break;}}void addmusic(){char name[MAX_NAME];FILE *file;int no;printf("please input the name of the music : \n");getinputs(name , MAX_NAME);no = getmaxno(MUSIC_LIST) +1 ;if(1 == no){file = fopen(MUSIC_LIST , "w");}else{file = fopen(MUSIC_LIST , "a");}fprintf(file,"%d,%d,%s",no,mselect,name);fclose(file);}void listmusics(){FILE* file;int no , cd;char name[MAX_NAME];char line[MAX_LINE];file = fopen(MUSIC_LIST , "r");if(NULL == file ) printf("no musics ! \n");else {fgets(line,MAX_NAME,file);while(!feof(file)){if(3 == sscanf(line, "%d,%d,%s",&no,&cd,name) && cd == mselect)printf("%s",line);fgets(line,MAX_NAME,file);}fclose(file);}}void removemusic(){char name[MAX_NAME] , line[MAX_LINE];FILE *file , *tempfile;int input , no;printf("please input the no of the music : \n");getinputi(&input);file = fopen(MUSIC_LIST , "r");tempfile = fopen(TEMP_FILE , "w+");fgets(line,MAX_LINE,file);while(!feof(file)){if(1 == sscanf(line , "%d",&no) && no != input)fprintf(tempfile,"%s",line);fgets(line,MAX_LINE,file);}fclose(file);fseek(tempfile , 0 , SEEK_SET);file = fopen(MUSIC_LIST , "w");fgets(line,MAX_LINE,tempfile);while(!feof(tempfile)){fprintf(file,"%s",line);fgets(line,MAX_LINE,tempfile);}fclose(file);fclose(tempfile);unlink(TEMP_FILE);}void back(){mselect = NOSELECT;}void deletecd(){char name[MAX_NAME] , line[MAX_LINE];FILE *file , *tempfile;int input , no;file = fopen(CD_LIST , "r");tempfile = fopen(TEMP_FILE , "w+");fgets(line,MAX_LINE,file);while(!feof(file)){if(1 == sscanf(line , "%d",&no) && no != mselect)fprintf(tempfile,"%s",line);fgets(line,MAX_LINE,file);}fclose(file);fseek(tempfile , 0 , SEEK_SET);file = fopen(CD_LIST , "w");fgets(line,MAX_LINE,tempfile);while(!feof(tempfile)){fprintf(file,"%s",line);fgets(line,MAX_LINE,tempfile);}fclose(file);fclose(tempfile);unlink(TEMP_FILE);back();}void musicmanager(){char c;showmusicsmenu();getinputc(&c);switch(c){case 'a':addmusic();break;case 'l':listmusics();break;case 'r':removemusic();break;case 'd':deletecd();break;case 'b':back();break;case 'q':quit();break;default:printf("error input\n");break;}}int main(){welcome();while(1){if(NOSELECT == mselect){cdmanager();}else{musicmanager();}}return 0;}