1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <termios.h>
5 #include <sys/ioctl.h>
6 #include <sys/types.h>
7 #include <sys/stat.h>
8 #include <unistd.h>
9 #include <dirent.h>
10 #include "subcmd-util.h"
11 #include "help.h"
12 #include "exec-cmd.h"
13
add_cmdname(struct cmdnames * cmds,const char * name,size_t len)14 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
15 {
16 struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
17
18 ent->len = len;
19 memcpy(ent->name, name, len);
20 ent->name[len] = 0;
21
22 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
23 cmds->names[cmds->cnt++] = ent;
24 }
25
clean_cmdnames(struct cmdnames * cmds)26 void clean_cmdnames(struct cmdnames *cmds)
27 {
28 unsigned int i;
29
30 for (i = 0; i < cmds->cnt; ++i)
31 zfree(&cmds->names[i]);
32 zfree(&cmds->names);
33 cmds->cnt = 0;
34 cmds->alloc = 0;
35 }
36
cmdname_compare(const void * a_,const void * b_)37 int cmdname_compare(const void *a_, const void *b_)
38 {
39 struct cmdname *a = *(struct cmdname **)a_;
40 struct cmdname *b = *(struct cmdname **)b_;
41 return strcmp(a->name, b->name);
42 }
43
uniq(struct cmdnames * cmds)44 void uniq(struct cmdnames *cmds)
45 {
46 unsigned int i, j;
47
48 if (!cmds->cnt)
49 return;
50
51 for (i = j = 1; i < cmds->cnt; i++)
52 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
53 cmds->names[j++] = cmds->names[i];
54
55 cmds->cnt = j;
56 }
57
exclude_cmds(struct cmdnames * cmds,struct cmdnames * excludes)58 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
59 {
60 size_t ci, cj, ei;
61 int cmp;
62
63 ci = cj = ei = 0;
64 while (ci < cmds->cnt && ei < excludes->cnt) {
65 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
66 if (cmp < 0)
67 cmds->names[cj++] = cmds->names[ci++];
68 else if (cmp == 0)
69 ci++, ei++;
70 else if (cmp > 0)
71 ei++;
72 }
73
74 while (ci < cmds->cnt)
75 cmds->names[cj++] = cmds->names[ci++];
76
77 cmds->cnt = cj;
78 }
79
get_term_dimensions(struct winsize * ws)80 static void get_term_dimensions(struct winsize *ws)
81 {
82 char *s = getenv("LINES");
83
84 if (s != NULL) {
85 ws->ws_row = atoi(s);
86 s = getenv("COLUMNS");
87 if (s != NULL) {
88 ws->ws_col = atoi(s);
89 if (ws->ws_row && ws->ws_col)
90 return;
91 }
92 }
93 #ifdef TIOCGWINSZ
94 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
95 ws->ws_row && ws->ws_col)
96 return;
97 #endif
98 ws->ws_row = 25;
99 ws->ws_col = 80;
100 }
101
pretty_print_string_list(struct cmdnames * cmds,int longest)102 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
103 {
104 int cols = 1, rows;
105 int space = longest + 1; /* min 1 SP between words */
106 struct winsize win;
107 int max_cols;
108 int i, j;
109
110 get_term_dimensions(&win);
111 max_cols = win.ws_col - 1; /* don't print *on* the edge */
112
113 if (space < max_cols)
114 cols = max_cols / space;
115 rows = (cmds->cnt + cols - 1) / cols;
116
117 for (i = 0; i < rows; i++) {
118 printf(" ");
119
120 for (j = 0; j < cols; j++) {
121 unsigned int n = j * rows + i;
122 unsigned int size = space;
123
124 if (n >= cmds->cnt)
125 break;
126 if (j == cols-1 || n + rows >= cmds->cnt)
127 size = 1;
128 printf("%-*s", size, cmds->names[n]->name);
129 }
130 putchar('\n');
131 }
132 }
133
is_executable(const char * name)134 static int is_executable(const char *name)
135 {
136 struct stat st;
137
138 if (stat(name, &st) || /* stat, not lstat */
139 !S_ISREG(st.st_mode))
140 return 0;
141
142 return st.st_mode & S_IXUSR;
143 }
144
has_extension(const char * filename,const char * ext)145 static int has_extension(const char *filename, const char *ext)
146 {
147 size_t len = strlen(filename);
148 size_t extlen = strlen(ext);
149
150 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
151 }
152
list_commands_in_dir(struct cmdnames * cmds,const char * path,const char * prefix)153 static void list_commands_in_dir(struct cmdnames *cmds,
154 const char *path,
155 const char *prefix)
156 {
157 int prefix_len;
158 DIR *dir = opendir(path);
159 struct dirent *de;
160 char *buf = NULL;
161
162 if (!dir)
163 return;
164 if (!prefix)
165 prefix = "perf-";
166 prefix_len = strlen(prefix);
167
168 astrcatf(&buf, "%s/", path);
169
170 while ((de = readdir(dir)) != NULL) {
171 int entlen;
172
173 if (prefixcmp(de->d_name, prefix))
174 continue;
175
176 astrcat(&buf, de->d_name);
177 if (!is_executable(buf))
178 continue;
179
180 entlen = strlen(de->d_name) - prefix_len;
181 if (has_extension(de->d_name, ".exe"))
182 entlen -= 4;
183
184 add_cmdname(cmds, de->d_name + prefix_len, entlen);
185 }
186 closedir(dir);
187 free(buf);
188 }
189
load_command_list(const char * prefix,struct cmdnames * main_cmds,struct cmdnames * other_cmds)190 void load_command_list(const char *prefix,
191 struct cmdnames *main_cmds,
192 struct cmdnames *other_cmds)
193 {
194 const char *env_path = getenv("PATH");
195 char *exec_path = get_argv_exec_path();
196
197 if (exec_path) {
198 list_commands_in_dir(main_cmds, exec_path, prefix);
199 qsort(main_cmds->names, main_cmds->cnt,
200 sizeof(*main_cmds->names), cmdname_compare);
201 uniq(main_cmds);
202 }
203
204 if (env_path) {
205 char *paths, *path, *colon;
206 path = paths = strdup(env_path);
207 while (1) {
208 if ((colon = strchr(path, ':')))
209 *colon = 0;
210 if (!exec_path || strcmp(path, exec_path))
211 list_commands_in_dir(other_cmds, path, prefix);
212
213 if (!colon)
214 break;
215 path = colon + 1;
216 }
217 free(paths);
218
219 qsort(other_cmds->names, other_cmds->cnt,
220 sizeof(*other_cmds->names), cmdname_compare);
221 uniq(other_cmds);
222 }
223 free(exec_path);
224 exclude_cmds(other_cmds, main_cmds);
225 }
226
list_commands(const char * title,struct cmdnames * main_cmds,struct cmdnames * other_cmds)227 void list_commands(const char *title, struct cmdnames *main_cmds,
228 struct cmdnames *other_cmds)
229 {
230 unsigned int i, longest = 0;
231
232 for (i = 0; i < main_cmds->cnt; i++)
233 if (longest < main_cmds->names[i]->len)
234 longest = main_cmds->names[i]->len;
235 for (i = 0; i < other_cmds->cnt; i++)
236 if (longest < other_cmds->names[i]->len)
237 longest = other_cmds->names[i]->len;
238
239 if (main_cmds->cnt) {
240 char *exec_path = get_argv_exec_path();
241 printf("available %s in '%s'\n", title, exec_path);
242 printf("----------------");
243 mput_char('-', strlen(title) + strlen(exec_path));
244 putchar('\n');
245 pretty_print_string_list(main_cmds, longest);
246 putchar('\n');
247 free(exec_path);
248 }
249
250 if (other_cmds->cnt) {
251 printf("%s available from elsewhere on your $PATH\n", title);
252 printf("---------------------------------------");
253 mput_char('-', strlen(title));
254 putchar('\n');
255 pretty_print_string_list(other_cmds, longest);
256 putchar('\n');
257 }
258 }
259
is_in_cmdlist(struct cmdnames * c,const char * s)260 int is_in_cmdlist(struct cmdnames *c, const char *s)
261 {
262 unsigned int i;
263
264 for (i = 0; i < c->cnt; i++)
265 if (!strcmp(s, c->names[i]->name))
266 return 1;
267 return 0;
268 }
269