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