1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <string.h> 5 #include <linux/string.h> 6 #include <termios.h> 7 #include <sys/ioctl.h> 8 #include <sys/types.h> 9 #include <sys/stat.h> 10 #include <unistd.h> 11 #include <dirent.h> 12 #include "subcmd-util.h" 13 #include "help.h" 14 #include "exec-cmd.h" 15 16 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len) 17 { 18 struct cmdname *ent = malloc(sizeof(*ent) + len + 1); 19 if (!ent) 20 return; 21 22 ent->len = len; 23 memcpy(ent->name, name, len); 24 ent->name[len] = 0; 25 26 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc); 27 cmds->names[cmds->cnt++] = ent; 28 } 29 30 void clean_cmdnames(struct cmdnames *cmds) 31 { 32 unsigned int i; 33 34 for (i = 0; i < cmds->cnt; ++i) 35 zfree(&cmds->names[i]); 36 zfree(&cmds->names); 37 cmds->cnt = 0; 38 cmds->alloc = 0; 39 } 40 41 int cmdname_compare(const void *a_, const void *b_) 42 { 43 struct cmdname *a = *(struct cmdname **)a_; 44 struct cmdname *b = *(struct cmdname **)b_; 45 return strcmp(a->name, b->name); 46 } 47 48 void uniq(struct cmdnames *cmds) 49 { 50 unsigned int i, j; 51 52 if (!cmds->cnt) 53 return; 54 55 for (i = j = 1; i < cmds->cnt; i++) 56 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name)) 57 cmds->names[j++] = cmds->names[i]; 58 59 cmds->cnt = j; 60 } 61 62 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes) 63 { 64 size_t ci, cj, ei; 65 int cmp; 66 67 ci = cj = ei = 0; 68 while (ci < cmds->cnt && ei < excludes->cnt) { 69 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name); 70 if (cmp < 0) { 71 zfree(&cmds->names[cj]); 72 cmds->names[cj++] = cmds->names[ci++]; 73 } else if (cmp == 0) { 74 ci++; 75 ei++; 76 } else if (cmp > 0) { 77 ei++; 78 } 79 } 80 81 while (ci < cmds->cnt) { 82 zfree(&cmds->names[cj]); 83 cmds->names[cj++] = cmds->names[ci++]; 84 } 85 for (ci = cj; ci < cmds->cnt; ci++) 86 zfree(&cmds->names[ci]); 87 cmds->cnt = cj; 88 } 89 90 static void get_term_dimensions(struct winsize *ws) 91 { 92 char *s = getenv("LINES"); 93 94 if (s != NULL) { 95 ws->ws_row = atoi(s); 96 s = getenv("COLUMNS"); 97 if (s != NULL) { 98 ws->ws_col = atoi(s); 99 if (ws->ws_row && ws->ws_col) 100 return; 101 } 102 } 103 #ifdef TIOCGWINSZ 104 if (ioctl(1, TIOCGWINSZ, ws) == 0 && 105 ws->ws_row && ws->ws_col) 106 return; 107 #endif 108 ws->ws_row = 25; 109 ws->ws_col = 80; 110 } 111 112 static void pretty_print_string_list(struct cmdnames *cmds, int longest) 113 { 114 int cols = 1, rows; 115 int space = longest + 1; /* min 1 SP between words */ 116 struct winsize win; 117 int max_cols; 118 int i, j; 119 120 get_term_dimensions(&win); 121 max_cols = win.ws_col - 1; /* don't print *on* the edge */ 122 123 if (space < max_cols) 124 cols = max_cols / space; 125 rows = (cmds->cnt + cols - 1) / cols; 126 127 for (i = 0; i < rows; i++) { 128 printf(" "); 129 130 for (j = 0; j < cols; j++) { 131 unsigned int n = j * rows + i; 132 unsigned int size = space; 133 134 if (n >= cmds->cnt) 135 break; 136 if (j == cols-1 || n + rows >= cmds->cnt) 137 size = 1; 138 printf("%-*s", size, cmds->names[n]->name); 139 } 140 putchar('\n'); 141 } 142 } 143 144 static int is_executable(const char *name) 145 { 146 struct stat st; 147 148 if (stat(name, &st) || /* stat, not lstat */ 149 !S_ISREG(st.st_mode)) 150 return 0; 151 152 return st.st_mode & S_IXUSR; 153 } 154 155 static int has_extension(const char *filename, const char *ext) 156 { 157 size_t len = strlen(filename); 158 size_t extlen = strlen(ext); 159 160 return len > extlen && !memcmp(filename + len - extlen, ext, extlen); 161 } 162 163 static void list_commands_in_dir(struct cmdnames *cmds, 164 const char *path, 165 const char *prefix) 166 { 167 int prefix_len; 168 DIR *dir = opendir(path); 169 struct dirent *de; 170 char *buf = NULL; 171 172 if (!dir) 173 return; 174 if (!prefix) 175 prefix = "perf-"; 176 prefix_len = strlen(prefix); 177 178 astrcatf(&buf, "%s/", path); 179 180 while ((de = readdir(dir)) != NULL) { 181 int entlen; 182 183 if (!strstarts(de->d_name, prefix)) 184 continue; 185 186 astrcat(&buf, de->d_name); 187 if (!is_executable(buf)) 188 continue; 189 190 entlen = strlen(de->d_name) - prefix_len; 191 if (has_extension(de->d_name, ".exe")) 192 entlen -= 4; 193 194 add_cmdname(cmds, de->d_name + prefix_len, entlen); 195 } 196 closedir(dir); 197 free(buf); 198 } 199 200 void load_command_list(const char *prefix, 201 struct cmdnames *main_cmds, 202 struct cmdnames *other_cmds) 203 { 204 const char *env_path = getenv("PATH"); 205 char *exec_path = get_argv_exec_path(); 206 207 if (exec_path) { 208 list_commands_in_dir(main_cmds, exec_path, prefix); 209 qsort(main_cmds->names, main_cmds->cnt, 210 sizeof(*main_cmds->names), cmdname_compare); 211 uniq(main_cmds); 212 } 213 214 if (env_path) { 215 char *paths, *path, *colon; 216 path = paths = strdup(env_path); 217 while (1) { 218 if ((colon = strchr(path, ':'))) 219 *colon = 0; 220 if (!exec_path || strcmp(path, exec_path)) 221 list_commands_in_dir(other_cmds, path, prefix); 222 223 if (!colon) 224 break; 225 path = colon + 1; 226 } 227 free(paths); 228 229 qsort(other_cmds->names, other_cmds->cnt, 230 sizeof(*other_cmds->names), cmdname_compare); 231 uniq(other_cmds); 232 } 233 free(exec_path); 234 exclude_cmds(other_cmds, main_cmds); 235 } 236 237 void list_commands(const char *title, struct cmdnames *main_cmds, 238 struct cmdnames *other_cmds) 239 { 240 unsigned int i, longest = 0; 241 242 for (i = 0; i < main_cmds->cnt; i++) 243 if (longest < main_cmds->names[i]->len) 244 longest = main_cmds->names[i]->len; 245 for (i = 0; i < other_cmds->cnt; i++) 246 if (longest < other_cmds->names[i]->len) 247 longest = other_cmds->names[i]->len; 248 249 if (main_cmds->cnt) { 250 char *exec_path = get_argv_exec_path(); 251 printf("available %s in '%s'\n", title, exec_path); 252 printf("----------------"); 253 mput_char('-', strlen(title) + strlen(exec_path)); 254 putchar('\n'); 255 pretty_print_string_list(main_cmds, longest); 256 putchar('\n'); 257 free(exec_path); 258 } 259 260 if (other_cmds->cnt) { 261 printf("%s available from elsewhere on your $PATH\n", title); 262 printf("---------------------------------------"); 263 mput_char('-', strlen(title)); 264 putchar('\n'); 265 pretty_print_string_list(other_cmds, longest); 266 putchar('\n'); 267 } 268 } 269 270 int is_in_cmdlist(struct cmdnames *c, const char *s) 271 { 272 unsigned int i; 273 274 for (i = 0; i < c->cnt; i++) 275 if (!strcmp(s, c->names[i]->name)) 276 return 1; 277 return 0; 278 } 279