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