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++, 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
 82static 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
104static 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
136static 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
147static 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
155static 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
192void 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
229void 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
262int 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}