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
add_cmdname(struct cmdnames * cmds,const char * name,size_t len)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
clean_cmdnames(struct cmdnames * cmds)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
cmdname_compare(const void * a_,const void * b_)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
uniq(struct cmdnames * cmds)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
exclude_cmds(struct cmdnames * cmds,struct cmdnames * excludes)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
get_term_dimensions(struct winsize * ws)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
pretty_print_string_list(struct cmdnames * cmds,int longest)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
is_executable(const char * name)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
has_extension(const char * filename,const char * ext)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
list_commands_in_dir(struct cmdnames * cmds,const char * path,const char * prefix)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
load_command_list(const char * prefix,struct cmdnames * main_cmds,struct cmdnames * other_cmds)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
list_commands(const char * title,struct cmdnames * main_cmds,struct cmdnames * other_cmds)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
is_in_cmdlist(struct cmdnames * c,const char * s)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