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 <assert.h>
13 #include "subcmd-util.h"
14 #include "help.h"
15 #include "exec-cmd.h"
16
add_cmdname(struct cmdnames * cmds,const char * name,size_t len)17 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
18 {
19 struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
20 if (!ent)
21 return;
22
23 ent->len = len;
24 memcpy(ent->name, name, len);
25 ent->name[len] = 0;
26
27 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
28 cmds->names[cmds->cnt++] = ent;
29 }
30
clean_cmdnames(struct cmdnames * cmds)31 void clean_cmdnames(struct cmdnames *cmds)
32 {
33 unsigned int i;
34
35 for (i = 0; i < cmds->cnt; ++i)
36 zfree(&cmds->names[i]);
37 zfree(&cmds->names);
38 cmds->cnt = 0;
39 cmds->alloc = 0;
40 }
41
cmdname_compare(const void * a_,const void * b_)42 int cmdname_compare(const void *a_, const void *b_)
43 {
44 struct cmdname *a = *(struct cmdname **)a_;
45 struct cmdname *b = *(struct cmdname **)b_;
46 return strcmp(a->name, b->name);
47 }
48
uniq(struct cmdnames * cmds)49 void uniq(struct cmdnames *cmds)
50 {
51 unsigned int i, j;
52
53 if (!cmds->cnt)
54 return;
55
56 for (i = 1; i < cmds->cnt; i++) {
57 if (!strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
58 zfree(&cmds->names[i - 1]);
59 }
60 for (i = 0, j = 0; i < cmds->cnt; i++) {
61 if (cmds->names[i]) {
62 if (i == j)
63 j++;
64 else
65 cmds->names[j++] = cmds->names[i];
66 }
67 }
68 cmds->cnt = j;
69 while (j < i)
70 cmds->names[j++] = NULL;
71 }
72
exclude_cmds(struct cmdnames * cmds,struct cmdnames * excludes)73 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
74 {
75 size_t ci, cj, ei;
76 int cmp;
77
78 if (!excludes->cnt)
79 return;
80
81 ci = cj = ei = 0;
82 while (ci < cmds->cnt && ei < excludes->cnt) {
83 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
84 if (cmp < 0) {
85 if (ci == cj) {
86 ci++;
87 cj++;
88 } else {
89 cmds->names[cj++] = cmds->names[ci];
90 cmds->names[ci++] = NULL;
91 }
92 } else if (cmp == 0) {
93 zfree(&cmds->names[ci]);
94 ci++;
95 ei++;
96 } else if (cmp > 0) {
97 ei++;
98 }
99 }
100 while (ci < cmds->cnt) {
101 if (ci != cj) {
102 cmds->names[cj] = cmds->names[ci];
103 cmds->names[ci] = NULL;
104 }
105 ci++;
106 cj++;
107 }
108 for (ci = cj; ci < cmds->cnt; ci++)
109 assert(cmds->names[ci] == NULL);
110 cmds->cnt = cj;
111 }
112
get_term_dimensions(struct winsize * ws)113 static void get_term_dimensions(struct winsize *ws)
114 {
115 char *s = getenv("LINES");
116
117 if (s != NULL) {
118 ws->ws_row = atoi(s);
119 s = getenv("COLUMNS");
120 if (s != NULL) {
121 ws->ws_col = atoi(s);
122 if (ws->ws_row && ws->ws_col)
123 return;
124 }
125 }
126 #ifdef TIOCGWINSZ
127 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
128 ws->ws_row && ws->ws_col)
129 return;
130 #endif
131 ws->ws_row = 25;
132 ws->ws_col = 80;
133 }
134
pretty_print_string_list(struct cmdnames * cmds,int longest)135 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
136 {
137 int cols = 1, rows;
138 int space = longest + 1; /* min 1 SP between words */
139 struct winsize win;
140 int max_cols;
141 int i, j;
142
143 get_term_dimensions(&win);
144 max_cols = win.ws_col - 1; /* don't print *on* the edge */
145
146 if (space < max_cols)
147 cols = max_cols / space;
148 rows = (cmds->cnt + cols - 1) / cols;
149
150 for (i = 0; i < rows; i++) {
151 printf(" ");
152
153 for (j = 0; j < cols; j++) {
154 unsigned int n = j * rows + i;
155 unsigned int size = space;
156
157 if (n >= cmds->cnt)
158 break;
159 if (j == cols-1 || n + rows >= cmds->cnt)
160 size = 1;
161 printf("%-*s", size, cmds->names[n]->name);
162 }
163 putchar('\n');
164 }
165 }
166
is_executable(const char * name)167 static int is_executable(const char *name)
168 {
169 struct stat st;
170
171 if (stat(name, &st) || /* stat, not lstat */
172 !S_ISREG(st.st_mode))
173 return 0;
174
175 return st.st_mode & S_IXUSR;
176 }
177
has_extension(const char * filename,const char * ext)178 static int has_extension(const char *filename, const char *ext)
179 {
180 size_t len = strlen(filename);
181 size_t extlen = strlen(ext);
182
183 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
184 }
185
list_commands_in_dir(struct cmdnames * cmds,const char * path,const char * prefix)186 static void list_commands_in_dir(struct cmdnames *cmds,
187 const char *path,
188 const char *prefix)
189 {
190 int prefix_len;
191 DIR *dir = opendir(path);
192 struct dirent *de;
193 char *buf = NULL;
194
195 if (!dir)
196 return;
197 if (!prefix)
198 prefix = "perf-";
199 prefix_len = strlen(prefix);
200
201 astrcatf(&buf, "%s/", path);
202
203 while ((de = readdir(dir)) != NULL) {
204 int entlen;
205
206 if (!strstarts(de->d_name, prefix))
207 continue;
208
209 astrcat(&buf, de->d_name);
210 if (!is_executable(buf))
211 continue;
212
213 entlen = strlen(de->d_name) - prefix_len;
214 if (has_extension(de->d_name, ".exe"))
215 entlen -= 4;
216
217 add_cmdname(cmds, de->d_name + prefix_len, entlen);
218 }
219 closedir(dir);
220 free(buf);
221 }
222
load_command_list(const char * prefix,struct cmdnames * main_cmds,struct cmdnames * other_cmds)223 void load_command_list(const char *prefix,
224 struct cmdnames *main_cmds,
225 struct cmdnames *other_cmds)
226 {
227 const char *env_path = getenv("PATH");
228 char *exec_path = get_argv_exec_path();
229
230 if (exec_path) {
231 list_commands_in_dir(main_cmds, exec_path, prefix);
232 qsort(main_cmds->names, main_cmds->cnt,
233 sizeof(*main_cmds->names), cmdname_compare);
234 uniq(main_cmds);
235 }
236
237 if (env_path) {
238 char *paths, *path, *colon;
239 path = paths = strdup(env_path);
240 while (1) {
241 if ((colon = strchr(path, ':')))
242 *colon = 0;
243 if (!exec_path || strcmp(path, exec_path))
244 list_commands_in_dir(other_cmds, path, prefix);
245
246 if (!colon)
247 break;
248 path = colon + 1;
249 }
250 free(paths);
251
252 qsort(other_cmds->names, other_cmds->cnt,
253 sizeof(*other_cmds->names), cmdname_compare);
254 uniq(other_cmds);
255 }
256 free(exec_path);
257 exclude_cmds(other_cmds, main_cmds);
258 }
259
list_commands(const char * title,struct cmdnames * main_cmds,struct cmdnames * other_cmds)260 void list_commands(const char *title, struct cmdnames *main_cmds,
261 struct cmdnames *other_cmds)
262 {
263 unsigned int i, longest = 0;
264
265 for (i = 0; i < main_cmds->cnt; i++)
266 if (longest < main_cmds->names[i]->len)
267 longest = main_cmds->names[i]->len;
268 for (i = 0; i < other_cmds->cnt; i++)
269 if (longest < other_cmds->names[i]->len)
270 longest = other_cmds->names[i]->len;
271
272 if (main_cmds->cnt) {
273 char *exec_path = get_argv_exec_path();
274 printf("available %s in '%s'\n", title, exec_path);
275 printf("----------------");
276 mput_char('-', strlen(title) + strlen(exec_path));
277 putchar('\n');
278 pretty_print_string_list(main_cmds, longest);
279 putchar('\n');
280 free(exec_path);
281 }
282
283 if (other_cmds->cnt) {
284 printf("%s available from elsewhere on your $PATH\n", title);
285 printf("---------------------------------------");
286 mput_char('-', strlen(title));
287 putchar('\n');
288 pretty_print_string_list(other_cmds, longest);
289 putchar('\n');
290 }
291 }
292
is_in_cmdlist(struct cmdnames * c,const char * s)293 int is_in_cmdlist(struct cmdnames *c, const char *s)
294 {
295 unsigned int i;
296
297 for (i = 0; i < c->cnt; i++)
298 if (!strcmp(s, c->names[i]->name))
299 return 1;
300 return 0;
301 }
302