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| 1 | lab3 : implementing ls command | |
| 2 | ||
| 3 | ||
| 4 | system calls: | |
| 5 | ||
| 6 | -mkdir | |
| 7 | -opendir | |
| 8 | -readdir | |
| 9 | -rmdir | |
| 10 | -closedir | |
| 11 | -getcwd | |
| 12 | ||
| 13 | ||
| 14 | aim: print pwd | |
| 15 | ||
| 16 | pwd.c | |
| 17 | ||
| 18 | #include<stdio.h> | |
| 19 | #include<stdlib.h> | |
| 20 | #include<unistd.h> | |
| 21 | #define BUFF 1024 | |
| 22 | ||
| 23 | int main() | |
| 24 | {
| |
| 25 | char buf[BUFF]; | |
| 26 | ||
| 27 | if(getcwd(buf,sizeof(buf))!=NULL) | |
| 28 | {
| |
| 29 | printf("%s\n",buf);
| |
| 30 | } | |
| 31 | else | |
| 32 | {
| |
| 33 | printf("Error.");
| |
| 34 | } | |
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | ||
| 39 | aim:ls without hidden | |
| 40 | ||
| 41 | #include<stdio.h> | |
| 42 | #include<stdlib.h> | |
| 43 | #include<unistd.h> | |
| 44 | #include<dirent.h> | |
| 45 | #include<sys/types.h> | |
| 46 | #define BUFF 1024 | |
| 47 | ||
| 48 | int main() | |
| 49 | {
| |
| 50 | char buf[BUFF]; | |
| 51 | DIR *dirstream; | |
| 52 | struct dirent *d; | |
| 53 | ||
| 54 | if(getcwd(buf,sizeof(buf))!=NULL) | |
| 55 | {
| |
| 56 | if((dirstream=opendir(buf))!=NULL) | |
| 57 | {
| |
| 58 | while((d=readdir(dirstream))!=NULL) | |
| 59 | {
| |
| 60 | if((d->d_name)[0]!='.') | |
| 61 | printf("%s\n",d->d_name);
| |
| 62 | } | |
| 63 | } | |
| 64 | else | |
| 65 | {
| |
| 66 | printf("Error.\n");
| |
| 67 | exit(1); | |
| 68 | } | |
| 69 | } | |
| 70 | else | |
| 71 | {
| |
| 72 | printf("Error.\n");
| |
| 73 | exit(1); | |
| 74 | } | |
| 75 | ||
| 76 | ||
| 77 | ||
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | ||
| 83 | ||
| 84 | ||
| 85 | */recursive | |
| 86 | ||
| 87 | ||
| 88 | ||
| 89 | #include<stdio.h> | |
| 90 | #include<stdlib.h> | |
| 91 | #include<unistd.h> | |
| 92 | #include<dirent.h> | |
| 93 | #include<sys/types.h> | |
| 94 | #include<string.h> | |
| 95 | #define BUFF 4096 | |
| 96 | void print(char* buf) | |
| 97 | {
| |
| 98 | char buf2[BUFF]; | |
| 99 | DIR *dirstream,*dirstream2; | |
| 100 | struct dirent *d; | |
| 101 | printf("%s\t:\n",buf);
| |
| 102 | ||
| 103 | if((dirstream=opendir(buf))!=NULL) | |
| 104 | {
| |
| 105 | while((d=readdir(dirstream))!=NULL) | |
| 106 | {
| |
| 107 | if((d->d_name)[0]!='.') | |
| 108 | {
| |
| 109 | printf("%s\n",d->d_name);
| |
| 110 | } | |
| 111 | } | |
| 112 | ||
| 113 | ||
| 114 | if((dirstream2=opendir(buf))!=NULL) | |
| 115 | {
| |
| 116 | while((d=readdir(dirstream2))!=NULL) | |
| 117 | {
| |
| 118 | if(d->d_type == DT_DIR) | |
| 119 | {
| |
| 120 | if(d->d_name[0]!='.') | |
| 121 | {
| |
| 122 | if((chdir(d->d_name))==0 ) | |
| 123 | {
| |
| 124 | getcwd(buf2,sizeof(buf2)); | |
| 125 | print(buf2); | |
| 126 | } | |
| 127 | } | |
| 128 | } | |
| 129 | } | |
| 130 | } | |
| 131 | ||
| 132 | ||
| 133 | ||
| 134 | } | |
| 135 | else | |
| 136 | {
| |
| 137 | printf("Error.1\n");
| |
| 138 | exit(1); | |
| 139 | } | |
| 140 | } | |
| 141 | ||
| 142 | int main() | |
| 143 | {
| |
| 144 | char buf[BUFF]; | |
| 145 | ||
| 146 | if(getcwd(buf,sizeof(buf))!=NULL) | |
| 147 | ||
| 148 | {
| |
| 149 | ||
| 150 | print(buf); | |
| 151 | } | |
| 152 | else | |
| 153 | {
| |
| 154 | printf("Error.\n");
| |
| 155 | exit(1); | |
| 156 | } | |
| 157 | ||
| 158 | ||
| 159 | ||
| 160 | ||
| 161 | return 0; | |
| 162 | } |
