13 # define PATH_MAX 4096
17 extern int gitsetenv(char *name
, char *value
, int overwrite
);
20 static const char git_usage
[] =
21 "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
23 /* most gui terms set COLUMNS (although some don't export it) */
24 static int term_columns(void)
26 char *col_string
= getenv("COLUMNS");
29 if (col_string
&& (n_cols
= atoi(col_string
)) > 0)
37 fprintf(stderr
, "git: out of memory\n");
41 static inline void mput_char(char c
, unsigned int num
)
47 static struct cmdname
{
51 static int cmdname_alloc
, cmdname_cnt
;
53 static void add_cmdname(const char *name
, int len
)
56 if (cmdname_alloc
<= cmdname_cnt
) {
57 cmdname_alloc
= cmdname_alloc
+ 200;
58 cmdname
= realloc(cmdname
, cmdname_alloc
* sizeof(*cmdname
));
62 ent
= malloc(sizeof(*ent
) + len
);
66 memcpy(ent
->name
, name
, len
);
68 cmdname
[cmdname_cnt
++] = ent
;
71 static int cmdname_compare(const void *a_
, const void *b_
)
73 struct cmdname
*a
= *(struct cmdname
**)a_
;
74 struct cmdname
*b
= *(struct cmdname
**)b_
;
75 return strcmp(a
->name
, b
->name
);
78 static void pretty_print_string_list(struct cmdname
**cmdname
, int longest
)
81 int space
= longest
+ 1; /* min 1 SP between words */
82 int max_cols
= term_columns() - 1; /* don't print *on* the edge */
86 cols
= max_cols
/ space
;
88 qsort(cmdname
, cmdname_cnt
, sizeof(*cmdname
), cmdname_compare
);
90 for (i
= 0; i
< cmdname_cnt
; ) {
94 for (c
= cols
; c
&& i
< cmdname_cnt
; i
++) {
95 printf("%s", cmdname
[i
]->name
);
98 mput_char(' ', space
- cmdname
[i
]->len
);
104 static void list_commands(const char *exec_path
, const char *pattern
)
106 unsigned int longest
= 0;
109 DIR *dir
= opendir(exec_path
);
113 fprintf(stderr
, "git: '%s': %s\n", exec_path
, strerror(errno
));
117 dirlen
= strlen(exec_path
);
118 if (PATH_MAX
- 20 < dirlen
) {
119 fprintf(stderr
, "git: insanely long exec-path '%s'\n",
124 memcpy(path
, exec_path
, dirlen
);
125 path
[dirlen
++] = '/';
127 while ((de
= readdir(dir
)) != NULL
) {
131 if (strncmp(de
->d_name
, "git-", 4))
133 strcpy(path
+dirlen
, de
->d_name
);
134 if (stat(path
, &st
) || /* stat, not lstat */
135 !S_ISREG(st
.st_mode
) ||
136 !(st
.st_mode
& S_IXUSR
))
139 entlen
= strlen(de
->d_name
);
140 if (4 < entlen
&& !strcmp(de
->d_name
+ entlen
- 4, ".exe"))
143 if (longest
< entlen
)
146 add_cmdname(de
->d_name
+ 4, entlen
-4);
150 printf("git commands available in '%s'\n", exec_path
);
151 printf("----------------------------");
152 mput_char('-', strlen(exec_path
));
154 pretty_print_string_list(cmdname
, longest
- 4);
159 static void usage(const char *exec_path
, const char *fmt
, ...)
160 __attribute__((__format__(__printf__
, 2, 3), __noreturn__
));
162 static void usage(const char *exec_path
, const char *fmt
, ...)
179 list_commands(exec_path
, "git-*");
184 static void prepend_to_path(const char *dir
, int len
)
186 char *path
, *old_path
= getenv("PATH");
190 old_path
= "/usr/local/bin:/usr/bin:/bin";
192 path_len
= len
+ strlen(old_path
) + 1;
194 path
= malloc(path_len
+ 1);
195 path
[path_len
+ 1] = '\0';
197 memcpy(path
, dir
, len
);
199 memcpy(path
+ len
+ 1, old_path
, path_len
- len
);
201 setenv("PATH", path
, 1);
204 static void show_man_page(char *git_cmd
)
208 if (!strncmp(git_cmd
, "git", 3))
211 int page_len
= strlen(git_cmd
) + 4;
213 page
= malloc(page_len
+ 1);
214 strcpy(page
, "git-");
215 strcpy(page
+ 4, git_cmd
);
219 execlp("man", "man", page
, NULL
);
222 int main(int argc
, char **argv
, char **envp
)
224 char git_command
[PATH_MAX
+ 1];
225 char wd
[PATH_MAX
+ 1];
226 int i
, len
, show_help
= 0;
227 char *exec_path
= getenv("GIT_EXEC_PATH");
229 getcwd(wd
, PATH_MAX
);
232 exec_path
= GIT_EXEC_PATH
;
234 for (i
= 1; i
< argc
; i
++) {
237 if (strncmp(arg
, "--", 2))
242 if (!strncmp(arg
, "exec-path", 9)) {
251 else if (!strcmp(arg
, "version")) {
252 printf("git version %s\n", GIT_VERSION
);
255 else if (!strcmp(arg
, "help"))
261 if (i
>= argc
|| show_help
) {
263 usage(exec_path
, NULL
);
265 show_man_page(argv
[i
]);
268 if (*exec_path
!= '/') {
269 if (!getcwd(git_command
, sizeof(git_command
))) {
271 "git: cannot determine current directory");
274 len
= strlen(git_command
);
276 /* Trivial cleanup */
277 while (!strncmp(exec_path
, "./", 2)) {
279 while (*exec_path
== '/')
282 snprintf(git_command
+ len
, sizeof(git_command
) - len
,
286 strcpy(git_command
, exec_path
);
287 len
= strlen(git_command
);
288 prepend_to_path(git_command
, len
);
290 len
+= snprintf(git_command
+ len
, sizeof(git_command
) - len
,
292 if (sizeof(git_command
) <= len
) {
293 fprintf(stderr
, "git: command name given is too long (%d)\n", len
);
297 /* execve() can only ever return if it fails */
298 execve(git_command
, &argv
[i
], envp
);
301 usage(exec_path
, "'%s' is not a git-command", argv
[i
]);
303 fprintf(stderr
, "Failed to run command '%s': %s\n",
304 git_command
, strerror(errno
));