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| #include <dirent.h> #include <grp.h> #include <pwd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include <time.h> #include <unistd.h>
#define a 0b1000000 #define l 0b0100000 #define R 0b0010000 #define t 0b0001000 #define r 0b0000100 #define I 0b0000010 #define s 0b0000001
#define NONE "\033[m" #define GREEN "\033[0;32;32m" #define BLUE "\033[0;32;34m"
void tags_cal(int argc, char* argv[]); void restored_ls(struct dirent* cur_item); void sort(char** filenames, int start, int end); void do_r(char** filenames, int file_cnt); int partition(char** filenames, int start, int end); void swap(char** s1, char** s2); int compare(char* s1, char* s2); char* uid_to_name(uid_t); char* gid_to_name(gid_t); void mode_to_letters(int, char[]); char* uid_to_name(uid_t);
void do_i(char filename[]); void do_s(char filename[]); int do_name(char dirname[]); void do_myls(); void do_t(char** filenames); int Vec = 0; char* dirname[4096 * 128]; int dirlen = 0; char* filenames[4096 * 128]; int file_cnt = 0; int main(int argc, char* argv[]) { tags_cal(argc, argv); do_myls(); return 0; } void do_myls() { for (int i = 0; i < dirlen; i++) { if (do_name(dirname[i]) == -1) { continue; } if ((Vec & t) == t) { do_t(filenames); } if ((Vec & r) == r) { do_r(filenames, file_cnt); } printf("当前路径:\"%s\"\n", dirname[i]); int tag = 0; for (int j = 0; j < file_cnt; j++) { char path[4096] = {0}; strcpy(path, dirname[i]); int len = strlen(dirname[i]); strcpy(&path[len], "/"); strcpy(&path[len + 1], filenames[j]); tag++; if ((Vec & a) == 0) { if ((strcmp(filenames[j], ".") == 0 || strcmp(filenames[j], "..") == 0) || filenames[j][0] == '.') { continue; } } struct stat info; stat(path, &info); if (S_ISDIR(info.st_mode) && ((Vec & R) == R)) { char* tempdirname = (char*)malloc(sizeof(char) * 4096); strcpy(tempdirname, dirname[i]); int len = strlen(tempdirname); strcpy(&tempdirname[len], "/"); strcpy(&tempdirname[len + 1], filenames[j]); dirname[dirlen++] = tempdirname; } if ((Vec & I) == I) { do_i(path); } if ((Vec & s) == s) { do_s(path); } if ((Vec & l) == 0) { if (S_ISDIR(info.st_mode)) { printf(GREEN "%s\t" NONE, filenames[j]); } else { printf(BLUE "%s\t" NONE, filenames[j]); } } if ((Vec & l) == l) { void mode_to_letters(); char modestr[11]; mode_to_letters(info.st_mode, modestr); printf("%s ", modestr); printf("%4d ", (int)info.st_nlink); printf("%-8s ", uid_to_name(info.st_uid)); printf("%-8s ", gid_to_name(info.st_gid)); printf("%8ld ", (long)info.st_size); printf("%.12s ", ctime(&info.st_mtime)); if (S_ISDIR(info.st_mode)) { printf(GREEN "%s\t" NONE, filenames[j]); } else { printf(BLUE "%s\t" NONE, filenames[j]); } printf("\n"); } if ((tag % 5 == 0) && ((Vec & l) == 0)) { printf("\n"); } } for (int k = 0; k < file_cnt; k++) { memset(filenames[k], 4096, '\0'); } file_cnt = 0; } } void tags_cal(int argc, char* argv[]) { for (int i = 1; i < argc; i++) { if (argv[i][0] != '-') { char* tempdirname = (char*)malloc(sizeof(char) * 4096); strcpy(tempdirname, argv[i]); dirname[dirlen++] = tempdirname; } else { int len = strlen(argv[i]); for (int j = 1; j < len; j++) { switch (argv[i][j]) { case 'a': Vec |= a; break; case 'l': Vec |= l; break; case 'R': Vec |= R; break; case 't': Vec |= t; break; case 'r': Vec |= r; break; case 'i': Vec |= I; break; case 's': Vec |= s; break; default: fprintf(stderr, "%c参数错误!\n", argv[i][j]); break; } } } } if (dirlen == 0) { dirlen = 1; char* tempdirname = (char*)malloc(sizeof(char) * 2048); strcpy(tempdirname, "."); dirname[0] = tempdirname; } } void do_i(char filename[]) { struct stat info; if (stat(filename, &info) == -1) perror(filename); printf("%llu\t", info.st_ino); } void do_s(char filename[]) { struct stat info; if (stat(filename, &info) == -1) perror(filename); printf("%4llu\t", info.st_size / 4096 * 4 + (info.st_size % 4096 ? 4 : 0)); } int do_name(char dirname[]) { int i = 0; int len = 0; DIR* dir_ptr; struct dirent* direntp; if ((dir_ptr = opendir(dirname)) == NULL) { fprintf(stderr, "权限不够,cannot open: %s\n", dirname); return -1; } else { while ((direntp = readdir(dir_ptr))) { restored_ls(direntp); } sort(filenames, 0, file_cnt - 1); } printf("\n"); closedir(dir_ptr); return 1; } void sort(char** filenames, int start, int end) { if (start < end) { int position = partition(filenames, start, end); sort(filenames, start, position - 1); sort(filenames, position + 1, end); } } int partition(char** filenames, int start, int end) { if (!filenames) return -1; char* privot = filenames[start]; while (start < end) { while (start < end && compare(privot, filenames[end]) < 0) --end; swap(&filenames[start], &filenames[end]); while (start < end && compare(privot, filenames[start]) >= 0) ++start; swap(&filenames[start], &filenames[end]); } return start; } void swap(char** s1, char** s2) { char* tmp = *s1; *s1 = *s2; *s2 = tmp; } int compare(char* s1, char* s2) { if (*s1 == '.') s1++; if (*s2 == '.') s2++; while (*s1 && *s2 && *s1 == *s2) { ++s1; ++s2; if (*s1 == '.') s1++; if (*s2 == '.') s2++; } return *s1 - *s2; } void restored_ls(struct dirent* cur_item) { char* result = (char*)malloc(sizeof(char) * 4096); strcpy(result, cur_item->d_name); filenames[file_cnt++] = result; } void mode_to_letters(int mode, char str[]) { strcpy(str, "----------"); if (S_ISDIR(mode)) str[0] = 'd'; if (S_ISCHR(mode)) str[0] = 'c'; if (S_ISBLK(mode)) str[0] = 'b'; if (mode & S_IRUSR) str[1] = 'r'; if (mode & S_IWUSR) str[2] = 'w'; if (mode & S_IXUSR) str[3] = 'x';
if (mode & S_IRGRP) str[4] = 'r'; if (mode & S_IWGRP) str[5] = 'w'; if (mode & S_IXGRP) str[6] = 'x';
if (mode & S_IROTH) str[7] = 'r'; if (mode & S_IWOTH) str[8] = 'w'; if (mode & S_IXOTH) str[9] = 'x'; } char* gid_to_name(gid_t gid) { struct group *getgrgid(), *grp_ptr; static char numstr[10]; if ((grp_ptr = getgrgid(gid)) == NULL) { sprintf(numstr, "%d", gid); return numstr; } else { return grp_ptr->gr_name; } } char* uid_to_name(gid_t uid) { struct passwd* getpwuid(); struct passwd* pw_ptr; static char numstr[10]; if ((pw_ptr = getpwuid(uid)) == NULL) { sprintf(numstr, "%d", uid); return numstr; } else { return pw_ptr->pw_name; } } void do_t(char** filenames) { char temp[2048] = {0}; struct stat info1; struct stat info2; for (int i = 0; i < file_cnt - 1; i++) { for (int j = i + 1; j < file_cnt; j++) { stat(filenames[i], &info1); stat(filenames[j], &info2); if (info1.st_mtime < info2.st_mtime) { strcpy(temp, filenames[i]); strcpy(filenames[i], filenames[j]); strcpy(filenames[j], temp); } } } } void do_r(char** arr, int file_cnt) { char left = 0; char right = file_cnt - 1; char temp; while (left < right) { char* temp = arr[left]; arr[left] = arr[right]; arr[right] = temp; left++; right--; } }
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