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C语言-文件操作-9

news 2026/7/10 15:31:11

题目：

修改下列程序，用命令行界面代替交互式界面

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFSIZE 4096
#define SLEN 81
void append(FILE * source,FILE * dest);
char * s_gets(char * st,int n);
int main(){
FILE * fa, * fs;
int files = 0;
char file_app[SLEN];
char file_src[SLEN];
int ch;
puts("Enter name of destination file: ");
s_gets(file_app,SLEN); //输入目标文件名
if((fa = fopen(file_app,"a+")) == NULL){
fprintf(stderr,"cant't open %s\n",file_app);
exit(EXIT_FAILURE);
}
if(setvbuf(fa,NULL,_IOFBF,BUFSIZE) != 0){
fputs("Can't create output buffer\n",stderr);
exit(EXIT_FAILURE);
}
puts("Enter name of first source file (empty line to quit): ");
while(s_gets(file_src,SLEN) && file_src[0] != '\0'){
if(strcmp(file_src,file_app) == 0) fputs("Can't append file to itself\n",stderr);
else if((fs = fopen(file_src,"r")) == NULL) fprintf(stderr,"Can't open %s\n",file_src);
else{
if(setvbuf(fs,NULL,_IOFBF,BUFSIZE) != 0){
fputs("Cant's append file to itself\n",stderr);
continue;
}
append(fs,fa);
if(ferror(fs) != 0) fprintf(stderr,"Error in reading file %s.\n",file_src);
if(ferror(fa) != 0) fprintf(stderr,"Error in writing file %s.\n",file_app);
fclose(fs); //关闭读取文件，继续下一次的读取
files++;
printf("File %s appended.\n",file_src);
puts("Next file (empty line to quit): ");
}
}
printf("Done appending. %d files appended.\n",files);
rewind(fa);
printf("%s contents:\n",file_app);
while((ch = getc(fa)) != EOF) putchar(ch);
puts("Done displaying.");
fclose(fa);
return 0;
}
void append(FILE * source,FILE * dest){
size_t bytes;
static char temp[BUFSIZE];
while(( bytes = fread(temp,sizeof(char),BUFSIZE,source)) > 0){
fwrite(temp,sizeof(char),bytes,dest);
}
}
char * s_gets(char * st,int n){
char * ret_val;
char * find;
ret_val = fgets(st,n,stdin);
if(ret_val){
find = strchr(st,'\n');
if(find) *find = '\0';
else{
while(getchar() != '\n')
continue;
}
}
}

源代码：

#include <stdio.h> #include <stdlib.h> #include <string.h> #define BUFSIZE 4096 #define SLEN 81 void append(FILE * source,FILE * dest); char * s_gets(char * st,int n); int main(int argc,char * argv[]){ FILE * fa, * fs; int files = 0; int ch; if((fa = fopen(argv[1],"a+")) == NULL){ fprintf(stderr,"cant't open %s\n",argv[1]); exit(EXIT_FAILURE); } if(setvbuf(fa,NULL,_IOFBF,BUFSIZE) != 0){ fputs("Can't create output buffer\n",stderr); exit(EXIT_FAILURE); } for(int i = 2;i <= argc-1;i++){ if(strcmp(argv[i],argv[1]) == 0) fputs("Can't append file to itself\n",stderr); else if((fs = fopen(argv[i],"r")) == NULL) fprintf(stderr,"Can't open %s\n",argv[i]); else{ if(setvbuf(fs,NULL,_IOFBF,BUFSIZE) != 0){ fputs("Cant's append file to itself\n",stderr); continue; } append(fs,fa); if(ferror(fs) != 0) fprintf(stderr,"Error in reading file %s.\n",argv[i]); if(ferror(fa) != 0) fprintf(stderr,"Error in writing file %s.\n",argv[1]); fclose(fs); //关闭读取文件，继续下一次的读取 files++; printf("File %s appended.\n",argv[i]); } } printf("Done appending. %d files appended.\n",files); rewind(fa); printf("%s contents:\n",argv[1]); while((ch = getc(fa)) != EOF) putchar(ch); puts("\nDone displaying."); fclose(fa); return 0; } void append(FILE * source,FILE * dest){ size_t bytes; static char temp[BUFSIZE]; while(( bytes = fread(temp,sizeof(char),BUFSIZE,source)) > 0){ fwrite(temp,sizeof(char),bytes,dest); } } char * s_gets(char * st,int n){ char * ret_val; char * find; ret_val = fgets(st,n,stdin); if(ret_val){ find = strchr(st,'\n'); if(find) *find = '\0'; else{ while(getchar() != '\n') continue; } } }

演示效果：

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