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
 16void 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
 28void 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
 39int 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
 46void 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
 60void 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
 84static 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
106static 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
138static 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
149static 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
157static 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
194void 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
231void 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
264int 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}