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#include "cache.h"
/* We allow "recursive" symbolic links. Only within reason, though. */
#define MAXDEPTH 5
const char *make_absolute_path(const char *path)
{
static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
char cwd[1024] = "";
int buf_index = 1, len;
int depth = MAXDEPTH;
char *last_elem = NULL;
struct stat st;
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
die ("Too long path: %.*s", 60, path);
while (depth--) {
if (stat(buf, &st) || !S_ISDIR(st.st_mode)) {
char *last_slash = strrchr(buf, '/');
if (last_slash) {
*last_slash = '\0';
last_elem = xstrdup(last_slash + 1);
} else {
last_elem = xstrdup(buf);
*buf = '\0';
}
}
if (*buf) {
if (!*cwd && !getcwd(cwd, sizeof(cwd)))
die ("Could not get current working directory");
if (chdir(buf))
die ("Could not switch to '%s'", buf);
}
if (!getcwd(buf, PATH_MAX))
die ("Could not get current working directory");
if (last_elem) {
int len = strlen(buf);
if (len + strlen(last_elem) + 2 > PATH_MAX)
die ("Too long path name: '%s/%s'",
buf, last_elem);
buf[len] = '/';
strcpy(buf + len + 1, last_elem);
free(last_elem);
last_elem = NULL;
}
if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
len = readlink(buf, next_buf, PATH_MAX);
if (len < 0)
die ("Invalid symlink: %s", buf);
next_buf[len] = '\0';
buf = next_buf;
buf_index = 1 - buf_index;
next_buf = bufs[buf_index];
} else
break;
}
if (*cwd && chdir(cwd))
die ("Could not change back to '%s'", cwd);
return buf;
}
static const char *get_pwd_cwd(void)
{
static char cwd[PATH_MAX + 1];
char *pwd;
struct stat cwd_stat, pwd_stat;
if (getcwd(cwd, PATH_MAX) == NULL)
return NULL;
pwd = getenv("PWD");
if (pwd && strcmp(pwd, cwd)) {
stat(cwd, &cwd_stat);
if ((cwd_stat.st_dev || cwd_stat.st_ino) &&
!stat(pwd, &pwd_stat) &&
pwd_stat.st_dev == cwd_stat.st_dev &&
pwd_stat.st_ino == cwd_stat.st_ino) {
strlcpy(cwd, pwd, PATH_MAX);
}
}
return cwd;
}
const char *make_nonrelative_path(const char *path)
{
static char buf[PATH_MAX + 1];
if (is_absolute_path(path)) {
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
die("Too long path: %.*s", 60, path);
} else {
const char *cwd = get_pwd_cwd();
if (!cwd)
die("Cannot determine the current working directory");
if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
die("Too long path: %.*s", 60, path);
}
return buf;
}
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