// 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 "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;
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 {
zfree(&cmds->names[cj]);
cmds->names[cj++] = cmds->names[ci++];
}
} else if (cmp == 0) {
ci++;
ei++;
} else if (cmp > 0) {
ei++;
}
}
if (ci != cj) {
while (ci < cmds->cnt) {
zfree(&cmds->names[cj]);
cmds->names[cj++] = cmds->names[ci++];
}
}
for (ci = cj; ci < cmds->cnt; ci++)
zfree(&cmds->names[ci]);
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;
}
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