c - 替换文本中间的特定单词

Question

终于我成功了，我编写了这段代码并且工作正常。它可以让你插入一个文本，然后它会询问你需要搜索哪个单词，以及你需要替换的单词是什么，然后完成它的工作并将结果保存到新文件(temp.txt) )。我的问题是程序可以替换除 EOF 之前的文件末尾以外的所有特定单词这是我的代码

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
FILE *f1,*f2;

int main()
{
int i,Repetition=0,len,len_start,len_end,word_count=0,test=0;          //The length of the Word you need to search
char ch,ch1,search_word[10],replace_word[10];                          //Array for the word you need to search for
char *ptr=&(search_word[0]),*ptr1=&(search_word[1]);                  //Pointer on the first index of the search_word array
f1=fopen("pro.txt","w");
if(!f1){                                                       //Condition if the file does not opened correctly
        printf("Error opening file\n");
        exit(1);
}else{
    printf("enter your strings\n");
    }
f2=fopen("temp.txt","w");
if(!f2){
    puts("error opening file for writing");
    exit(1);
}
    do{                                                          //Loop to print the string to the file
    ch=getchar();
    fprintf(f1,"%c",ch);
   }while(ch!=EOF);
puts("\nEnter the word you need to search for : ");
scanf("%s",search_word);                                       //Insert the word you need to search
len=strlen(search_word);                                       //Calculate the length of the searched work
printf("\nyour word length is : %d",len);                      //Print the length of the word you need to search for
printf("\n");
puts("\nEnter the word you need to replace : ");
scanf("%s",replace_word);
fclose(f1);                                                   //Close file
printf("File closed....\n");



// The process of reading and editing the file
f1=fopen("pro.txt","r");
printf("\nFile Opened for reading....\n");                 //Open file for read and edit
ch = fgetc(f1);


start:
    if(test==1)
        ch=ch1;                                          //ch1: the next letter after ch read from file
        test=1;
ch1 = fgetc(f1);
fprintf(f2,"%c",ch);
while(ch != EOF){                                         //Read file from first to EOF
    if(*ptr==ch){                                        //ch:the letter read from file    ptr: is the pointer that point to the first letter in the search word
         if((ch1>=' ' && ch1<='@')){
        if(*(ptr1)=='\0'){                              //ptr1 is the pointer that point to the next letter in search word (if ptr1 read the '\0' that mean that you reached to last letter in search word
            len_end=ftell(f2);
            fseek(f2,len_end-len,SEEK_SET);
            len_start=ftell(f2);
            fprintf(f2,"%s",replace_word);
            word_count++;
            ptr=&search_word[0];
            ptr1=&search_word[1];
            goto start;
            /*len_end=ftell(f1)-1;
            fseek(f1,len_end-len,SEEK_SET);
            len_start=ftell(f1);
            fseek(f1,0,SEEK_SET);
            while(ftell(f1)!=(len_start)){
                ch=getc(f1);
                fprintf(f2,"%c",ch);
            }  if(ftell(f1)==(len_start)){
                        fputs(replace_word,f2);
            }
            fseek(f1,len_end+1,SEEK_SET);
           //printf("test4\n"); }else{
            ptr=&search_word[0];
            ptr1=&search_word[1];
            word_count++;
            goto start;*/
            //printf("test5\n");
            }
        //printf("test3\n");
        }
ptr++ ;
ptr1++ ;

   //printf("test2\n");
   }



    goto start;
}

fclose(f1);
fclose(f2);
    return 0;
}

Answer 1

使用 ch1 = fgetc(f1); 进行前瞻会导致 ch1 上的范围检查在 EOF 之前失败最后一个字符已处理完毕。尝试将其包含在范围检查中:

 if((ch1>=' ' && ch1<='@') || (ch1 == EOF))