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