// SPDX-License-Identifier: GPL-2.0#include <stdio.h>#include <stdlib.h>#include <string.h>#include <linux/string.h>#include <termios.h>#include <sys/ioctl.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include <dirent.h>#include <assert.h>#include "subcmd-util.h"#include "help.h"#include "exec-cmd.h" void add_cmdname(struct cmdnames *cmds, const char *name, size_t len){	struct cmdname *ent = malloc(sizeof(*ent) + len + 1);	if (!ent)		return; 	ent->len = len;	memcpy(ent->name, name, len);	ent->name[len] = 0; 	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);	cmds->names[cmds->cnt++] = ent;} void clean_cmdnames(struct cmdnames *cmds){	unsigned int i; 	for (i = 0; i < cmds->cnt; ++i)		zfree(&cmds->names[i]);	zfree(&cmds->names);	cmds->cnt = 0;	cmds->alloc = 0;} int cmdname_compare(const void *a_, const void *b_){	struct cmdname *a = *(struct cmdname **)a_;	struct cmdname *b = *(struct cmdname **)b_;	return strcmp(a->name, b->name);} void uniq(struct cmdnames *cmds){	unsigned int i, j; 	if (!cmds->cnt)		return; 	for (i = 1; i < cmds->cnt; i++) {		if (!strcmp(cmds->names[i]->name, cmds->names[i-1]->name))			zfree(&cmds->names[i - 1]);	}	for (i = 0, j = 0; i < cmds->cnt; i++) {		if (cmds->names[i]) {			if (i == j)				j++;			else				cmds->names[j++] = cmds->names[i];		}	}	cmds->cnt = j;	while (j < i)		cmds->names[j++] = NULL;} void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes){	size_t ci, cj, ei;	int cmp; 	if (!excludes->cnt)		return; 	ci = cj = ei = 0;	while (ci < cmds->cnt && ei < excludes->cnt) {		cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);		if (cmp < 0) {			if (ci == cj) {				ci++;				cj++;			} else {				cmds->names[cj++] = cmds->names[ci];				cmds->names[ci++] = NULL;			}		} else if (cmp == 0) {			zfree(&cmds->names[ci]);			ci++;			ei++;		} else if (cmp > 0) {			ei++;		}	}	if (ci != cj) {		while (ci < cmds->cnt) {			cmds->names[cj++] = cmds->names[ci];			cmds->names[ci++] = NULL;		}	}	for (ci = cj; ci < cmds->cnt; ci++)		assert(cmds->names[ci] == NULL);	cmds->cnt = cj;} static void get_term_dimensions(struct winsize *ws){	char *s = getenv("LINES"); 	if (s != NULL) {		ws->ws_row = atoi(s);		s = getenv("COLUMNS");		if (s != NULL) {			ws->ws_col = atoi(s);			if (ws->ws_row && ws->ws_col)				return;		}	}#ifdef TIOCGWINSZ	if (ioctl(1, TIOCGWINSZ, ws) == 0 &&	    ws->ws_row && ws->ws_col)		return;#endif	ws->ws_row = 25;	ws->ws_col = 80;} static void pretty_print_string_list(struct cmdnames *cmds, int longest){	int cols = 1, rows;	int space = longest + 1; /* min 1 SP between words */	struct winsize win;	int max_cols;	int i, j; 	get_term_dimensions(&win);	max_cols = win.ws_col - 1; /* don't print *on* the edge */ 	if (space < max_cols)		cols = max_cols / space;	rows = (cmds->cnt + cols - 1) / cols; 	for (i = 0; i < rows; i++) {		printf("  "); 		for (j = 0; j < cols; j++) {			unsigned int n = j * rows + i;			unsigned int size = space; 			if (n >= cmds->cnt)				break;			if (j == cols-1 || n + rows >= cmds->cnt)				size = 1;			printf("%-*s", size, cmds->names[n]->name);		}		putchar('\n');	}} static int is_executable(const char *name){	struct stat st; 	if (stat(name, &st) || /* stat, not lstat */	    !S_ISREG(st.st_mode))		return 0; 	return st.st_mode & S_IXUSR;} static int has_extension(const char *filename, const char *ext){	size_t len = strlen(filename);	size_t extlen = strlen(ext); 	return len > extlen && !memcmp(filename + len - extlen, ext, extlen);} static void list_commands_in_dir(struct cmdnames *cmds,					 const char *path,					 const char *prefix){	int prefix_len;	DIR *dir = opendir(path);	struct dirent *de;	char *buf = NULL; 	if (!dir)		return;	if (!prefix)		prefix = "perf-";	prefix_len = strlen(prefix); 	astrcatf(&buf, "%s/", path); 	while ((de = readdir(dir)) != NULL) {		int entlen; 		if (!strstarts(de->d_name, prefix))			continue; 		astrcat(&buf, de->d_name);		if (!is_executable(buf))			continue; 		entlen = strlen(de->d_name) - prefix_len;		if (has_extension(de->d_name, ".exe"))			entlen -= 4; 		add_cmdname(cmds, de->d_name + prefix_len, entlen);	}	closedir(dir);	free(buf);} void load_command_list(const char *prefix,		struct cmdnames *main_cmds,		struct cmdnames *other_cmds){	const char *env_path = getenv("PATH");	char *exec_path = get_argv_exec_path(); 	if (exec_path) {		list_commands_in_dir(main_cmds, exec_path, prefix);		qsort(main_cmds->names, main_cmds->cnt,		      sizeof(*main_cmds->names), cmdname_compare);		uniq(main_cmds);	} 	if (env_path) {		char *paths, *path, *colon;		path = paths = strdup(env_path);		while (1) {			if ((colon = strchr(path, ':')))				*colon = 0;			if (!exec_path || strcmp(path, exec_path))				list_commands_in_dir(other_cmds, path, prefix); 			if (!colon)				break;			path = colon + 1;		}		free(paths); 		qsort(other_cmds->names, other_cmds->cnt,		      sizeof(*other_cmds->names), cmdname_compare);		uniq(other_cmds);	}	free(exec_path);	exclude_cmds(other_cmds, main_cmds);} void list_commands(const char *title, struct cmdnames *main_cmds,		   struct cmdnames *other_cmds){	unsigned int i, longest = 0; 	for (i = 0; i < main_cmds->cnt; i++)		if (longest < main_cmds->names[i]->len)			longest = main_cmds->names[i]->len;	for (i = 0; i < other_cmds->cnt; i++)		if (longest < other_cmds->names[i]->len)			longest = other_cmds->names[i]->len; 	if (main_cmds->cnt) {		char *exec_path = get_argv_exec_path();		printf("available %s in '%s'\n", title, exec_path);		printf("----------------");		mput_char('-', strlen(title) + strlen(exec_path));		putchar('\n');		pretty_print_string_list(main_cmds, longest);		putchar('\n');		free(exec_path);	} 	if (other_cmds->cnt) {		printf("%s available from elsewhere on your $PATH\n", title);		printf("---------------------------------------");		mput_char('-', strlen(title));		putchar('\n');		pretty_print_string_list(other_cmds, longest);		putchar('\n');	}} int is_in_cmdlist(struct cmdnames *c, const char *s){	unsigned int i; 	for (i = 0; i < c->cnt; i++)		if (!strcmp(s, c->names[i]->name))			return 1;	return 0;}