linux c 判断文件存在，遍历文件，随机修改文件内容
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 #include<assert.h> 5 #include<string.h> 6 #include<dirent.h> 7 #include<unistd.h> 8 #include<sys/types.h> 9 #include<sys/stat.h> 10 #include<time.h> 11 12 13 #define PATH_LEN 512 14 //#define MODIFICATION_LEN 10 15 //#define MODIFICATION_TIMES 5 16 char source_file_folder[]="t5"; 17 char dest_file_folder[]="dest_file"; 18 19 int modification(char src_file[],int MODIFICATION_TIMES,int MODIFICATION_LEN,char source_file_dir[],char dest_file_dir[]) 20 { 21 FILE *src_fp,*dst_fp; 22 char src_file_path[PATH_LEN]; 23 char dst_file_path[PATH_LEN]; 24 snprintf(src_file_path,PATH_LEN,"%s/%s",source_file_dir,src_file); 25 snprintf(dst_file_path,PATH_LEN,"%s/%s",dest_file_dir,src_file); 26 src_fp=fopen(src_file_path,"a+"); 27 assert(src_fp!=NULL); 28 fseek(src_fp,0,SEEK_END); 29 int src_file_len=ftell(src_fp); 30 assert(src_file_len!=-1); 31 rewind(src_fp); 32 int *random_offset=(int *)calloc(MODIFICATION_TIMES,sizeof(int)); 33 assert(random_offset!=NULL); 34 srand((unsigned)time(NULL)); 35 int i=0; 36 do 37 { 38 random_offset[i]=rand()%src_file_len; 39 }while(random_offset[i++]<=src_file_len && i<MODIFICATION_TIMES); 40 dst_fp=fopen(dst_file_path,"w+"); 41 assert(dst_fp!=NULL); 42 char *buff=(char *)malloc(src_file_len*sizeof(char)); 43 assert(buff!=NULL); 44 if(fread(buff,src_file_len,1,src_fp)==1) 45 fwrite(buff,src_file_len,1,dst_fp); 46 //printf("src file : %s\n",buff); 47 //free(buff); 48 i=0; 49 char *center_buff; 50 while(i<MODIFICATION_TIMES) 51 { 52 int right_offset=random_offset[i]+MODIFICATION_LEN; 53 right_offset=right_offset>src_file_len?src_file_len:right_offset; 54 int center_len=right_offset-random_offset[i]; 55 center_buff=(char *)calloc(center_len,sizeof(char)); 56 memset(center_buff,'0',center_len); 57 fseek(dst_fp,random_offset[i],SEEK_SET); 58 fwrite(center_buff,center_len,1,dst_fp); 59 free(center_buff); 60 ++i; 61 } 62 free(buff); 63 fclose(src_fp); 64 fclose(dst_fp); 65 return 0; 66 67 } 68 69 void listDir(char *path,int modification_times,int modification_len,char source_file_dir[],char dest_file_dir[]) 70 { 71 DIR *pDir; 72 struct dirent *ent; 73 char childpath[PATH_LEN]; 74 pDir=opendir(path); 75 memset(childpath,0,sizeof(childpath)); 76 while((ent=readdir(pDir))!=NULL) 77 { 78 if(strcmp(ent->d_name,".")==0||strcmp(ent->d_name,"..")==0) 79 continue; 80 // if(ent->d_type==8) 81 snprintf(childpath,PATH_LEN,"%s/%s",path,ent->d_name); 82 printf("%s\n",childpath); 83 modification(ent->d_name,modification_times,modification_len,source_file_dir,dest_file_dir); 84 } 85 closedir(pDir); 86 } 87 int main(int argc,char *argv[]) 88 { 89 char ch; 90 char *source_file_dir=source_file_folder; 91 char *dest_file_dir=dest_file_folder; 92 int modification_len=10,modification_times=1; 93 if(argc<2) 94 { 95 printf("Usage:%s -t modification_times -l modification_len -s source_file_folder -d dest_file_folder\n",argv[0]); 96 return 0; 97 } 98 while((ch=getopt(argc,argv,"t:l:s:d:"))!=-1) 99 { 100 switch(ch) 101 { 102 case 't': 103 modification_times=atoi(optarg); 104 break; 105 case 'l': 106 modification_len=atoi(optarg); 107 break; 108 case 's': 109 source_file_dir=optarg; 110 break; 111 case 'd': 112 dest_file_dir=optarg; 113 break; 114 default: 115 printf("%s -t modification_times -l modification_len -s souce_file_folder -d dest_file_folder",argv[0]); 116 exit(0); 117 } 118 } 119 120 if(access(source_file_dir,0)==-1) 121 { 122 printf("%s is not exist\n",source_file_dir); 123 return -1; 124 } 125 if(access(dest_file_dir,0)==-1) 126 { 127 if(mkdir(dest_file_dir,0775)) 128 { 129 perror("mkdir dest folder failed \n"); return -1; 130 } 131 } 132 listDir(source_file_dir,modification_times,modification_len,source_file_dir,dest_file_dir); 133 return 0; 134 }
Makefile
all:rand_file_modification rand_file_modification : rand_file_modification.c gcc -g -Wall -o $@ $^ clean : rm rand_file_modification
