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tag: v0.99.9j
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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>

#ifndef PATH_MAX
# define PATH_MAX 4096
#endif

static const char git_usage[] =
"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";

/* most gui terms set COLUMNS (although some don't export it) */
static int term_columns(void)
{
char *col_string = getenv("COLUMNS");
int n_cols = 0;

if (col_string && (n_cols = atoi(col_string)) > 0)
return n_cols;

return 80;
}

static void oom(void)
{
fprintf(stderr, "git: out of memory\n");
exit(1);
}

static inline void mput_char(char c, unsigned int num)
{
while(num--)
putchar(c);
}

static struct cmdname {
size_t len;
char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;

static void add_cmdname(const char *name, int len)
{
struct cmdname *ent;
if (cmdname_alloc <= cmdname_cnt) {
cmdname_alloc = cmdname_alloc + 200;
cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
if (!cmdname)
oom();
}
ent = malloc(sizeof(*ent) + len);
if (!ent)
oom();
ent->len = len;
memcpy(ent->name, name, len+1);
cmdname[cmdname_cnt++] = ent;
}

static 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);
}

static void pretty_print_string_list(struct cmdname **cmdname, int longest)
{
int cols = 1;
int space = longest + 1; /* min 1 SP between words */
int max_cols = term_columns() - 1; /* don't print *on* the edge */
int i;

if (space < max_cols)
cols = max_cols / space;

qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);

for (i = 0; i < cmdname_cnt; ) {
int c;
printf(" ");

for (c = cols; c && i < cmdname_cnt; i++) {
printf("%s", cmdname[i]->name);

if (--c)
mput_char(' ', space - cmdname[i]->len);
}
putchar('\n');
}
}

static void list_commands(const char *exec_path, const char *pattern)
{
unsigned int longest = 0;
char path[PATH_MAX];
int dirlen;
DIR *dir = opendir(exec_path);
struct dirent *de;

if (!dir) {
fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
exit(1);
}

dirlen = strlen(exec_path);
if (PATH_MAX - 20 < dirlen) {
fprintf(stderr, "git: insanely long exec-path '%s'\n",
exec_path);
exit(1);
}

memcpy(path, exec_path, dirlen);
path[dirlen++] = '/';

while ((de = readdir(dir)) != NULL) {
struct stat st;
int entlen;

if (strncmp(de->d_name, "git-", 4))
continue;
strcpy(path+dirlen, de->d_name);
if (stat(path, &st) || /* stat, not lstat */
!S_ISREG(st.st_mode) ||
!(st.st_mode & S_IXUSR))
continue;

entlen = strlen(de->d_name);

if (longest < entlen)
longest = entlen;

add_cmdname(de->d_name + 4, entlen-4);
}
closedir(dir);

printf("git commands available in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(cmdname, longest - 4);
putchar('\n');
}

#ifdef __GNUC__
static void usage(const char *exec_path, const char *fmt, ...)
__attribute__((__format__(__printf__, 2, 3), __noreturn__));
#endif
static void usage(const char *exec_path, const char *fmt, ...)
{
if (fmt) {
va_list ap;

va_start(ap, fmt);
printf("git: ");
vprintf(fmt, ap);
va_end(ap);
putchar('\n');
}
else
puts(git_usage);

putchar('\n');

if(exec_path)
list_commands(exec_path, "git-*");

exit(1);
}

static void prepend_to_path(const char *dir, int len)
{
char *path, *old_path = getenv("PATH");
int path_len = len;

if (!old_path)
old_path = "/usr/local/bin:/usr/bin:/bin";

path_len = len + strlen(old_path) + 1;

path = malloc(path_len + 1);
path[path_len + 1] = '\0';

memcpy(path, dir, len);
path[len] = ':';
memcpy(path + len + 1, old_path, path_len - len);

setenv("PATH", path, 1);
}

static void show_man_page(char *git_cmd)
{
char *page;

if (!strncmp(git_cmd, "git", 3))
page = git_cmd;
else {
int page_len = strlen(git_cmd) + 4;

page = malloc(page_len + 1);
strcpy(page, "git-");
strcpy(page + 4, git_cmd);
page[page_len] = 0;
}

execlp("man", "man", page, NULL);
}

int main(int argc, char **argv, char **envp)
{
char git_command[PATH_MAX + 1];
char wd[PATH_MAX + 1];
int i, len, show_help = 0;
char *exec_path = getenv("GIT_EXEC_PATH");

getcwd(wd, PATH_MAX);

if (!exec_path)
exec_path = GIT_EXEC_PATH;

for (i = 1; i < argc; i++) {
char *arg = argv[i];

if (strncmp(arg, "--", 2))
break;

arg += 2;

if (!strncmp(arg, "exec-path", 9)) {
arg += 9;
if (*arg == '=')
exec_path = arg + 1;
else {
puts(exec_path);
exit(0);
}
}
else if (!strcmp(arg, "version")) {
printf("git version %s\n", GIT_VERSION);
exit(0);
}
else if (!strcmp(arg, "help"))
show_help = 1;
else if (!show_help)
usage(NULL, NULL);
}

if (i >= argc || show_help) {
if (i >= argc)
usage(exec_path, NULL);

show_man_page(argv[i]);
}

if (*exec_path != '/') {
if (!getcwd(git_command, sizeof(git_command))) {
fprintf(stderr,
"git: cannot determine current directory");
exit(1);
}
len = strlen(git_command);

/* Trivial cleanup */
while (!strncmp(exec_path, "./", 2)) {
exec_path += 2;
while (*exec_path == '/')
*exec_path++;
}
snprintf(git_command + len, sizeof(git_command) - len,
"/%s", exec_path);
}
else
strcpy(git_command, exec_path);
len = strlen(git_command);
prepend_to_path(git_command, len);

strncat(&git_command[len], "/git-", sizeof(git_command) - len);
len += 5;
strncat(&git_command[len], argv[i], sizeof(git_command) - len);

if (access(git_command, X_OK))
usage(exec_path, "'%s' is not a git-command", argv[i]);

/* execve() can only ever return if it fails */
execve(git_command, &argv[i], envp);
printf("Failed to run command '%s': %s\n", git_command, strerror(errno));

return 1;
}
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