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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-r | -u] contact-id ... photo");
static char *
get_target(const char *path, size_t *lenp)
{
char *target = NULL;
size_t size = 0;
ssize_t n = 0;
do {
if ((size_t)n == size)
target = erealloc(target, size += 512);
n = readlink(path, target, size);
if (n < 0) {
if (errno == EINVAL) {
free(target);
return NULL;
}
eprintf("readlink %s:", path);
}
} while ((size_t)n >= size);
*lenp = (size_t)n;
target[n] = '\0';
return target;
}
static char *
get_absolute_path(const char *path, const char *cwd)
{
char *ret, *r, *w, *target, *new;
size_t len1, len2, len3, targetlen, retlennul, looplimit = 64;
if (path[0] == '/') {
retlennul = strlen(path) + 1;
ret = emalloc(retlennul);
memcpy(ret, path, retlennul);
} else {
len1 = strlen(cwd);
len2 = strlen(path);
retlennul = len1 + len2 + 2;
ret = emalloc(retlennul);
memcpy(ret, cwd, len1);
ret[len1++] = '/';
memcpy(&ret[len1], path, ++len2);
}
again:
for (w = r = ret; *r;) {
if (r[0] == '/' && (r[1] == '/' || !r[1])) {
r += 1;
} else if (r[0] == '/' && r[1] == '.' && (r[2] == '/' || !r[2])) {
r += 2;
} else if (r[0] == '/' && r[1] == '.' && r[2] == '.' && (r[3] == '/' || !r[3])) {
*w = '\0';
target = get_target(ret, &targetlen);
if (!target) {
while (w[-1] != '/')
w--;
r += 3;
} else if (!target[0]) {
eprintf("%s: encountered symlink with empty target\n", path);
} else if (target[0] == '/') {
if (!looplimit--) {
errno = ELOOP;
eprintf("%s:", path);
}
len1 = targetlen;
len2 = retlennul - (size_t)(r - ret);
retlennul = len1 + len2;
new = emalloc(retlennul);
memcpy(new, target, len1);
memcpy(&new[len1], r, len2);
free(ret);
ret = new;
free(target);
goto again;
} else {
if (!looplimit--) {
errno = ELOOP;
eprintf("%s:", path);
}
while (w[-1] != '/')
w--;
len1 = (size_t)(w - ret);
len2 = targetlen;
len3 = retlennul - (size_t)(r - ret);
retlennul = len1 + len2 + len3;
new = emalloc(retlennul);
memcpy(new, ret, len1);
memcpy(&new[len1], target, len2);
memcpy(&new[len1 + len2], r, len3);
free(ret);
ret = new;
r = w = &ret[len1];
free(target);
}
} else {
*w++ = *r++;
}
}
*w = '\0';
if (!*ret) {
ret[0] = '/';
ret[1] = '\0';
}
return ret;
}
static const char *
get_cwd(char **free_this)
{
char *cwd = NULL;
size_t size = 64 / 2;
int saved_errno = errno;
const char *pwd;
struct stat cst, pst;
*free_this = NULL;
for (;;) {
cwd = erealloc(*free_this, size *= 2);
*free_this = cwd;
if (getcwd(cwd, size))
break;
if (errno != ERANGE)
eprintf("getcwd %zu:", size);
}
errno = saved_errno;
if (!(pwd = getenv("PWD")) || *pwd != '/' || stat(pwd, &pst) || stat(cwd, &cst))
return cwd;
if (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) {
free(*free_this);
*free_this = NULL;
return pwd;
}
return cwd;
}
int
main(int argc, char *argv[])
{
int remove = 0, as_is = 0;
struct passwd *user;
struct libcontacts_contact contact;
char *photo, **r, **w, *newpath = NULL, *home, *cwd_free;
const char *cwd;
int ret = 0;
size_t i, len;
ARGBEGIN {
case 'r':
as_is = 1;
break;
case 'u':
remove = 1;
break;
default:
usage();
} ARGEND;
if (argc < 2 || (as_is & remove))
usage();
as_is |= remove;
photo = argv[--argc];
argv[argc] = NULL;
for (i = 0; argv[i]; i++)
if (!*argv[i] || strchr(argv[i], '/'))
usage();
errno = 0;
user = getpwuid(getuid());
if (!user)
eprintf("getpwuid: %s\n", errno ? strerror(errno) : "user does not exist");
if (!as_is && user->pw_dir && user->pw_dir[0] == '/' && photo[0] != '/') {
cwd = get_cwd(&cwd_free);
if (cwd[0] != '/')
abort();
newpath = get_absolute_path(photo, cwd);
home = get_absolute_path(user->pw_dir, cwd);
free(cwd_free);
len = strlen(home);
if (!strncmp(newpath, home, len) && newpath[len] == '/')
photo = &newpath[len + 1];
else
photo = newpath;
free(home);
}
for (; *argv; argv++) {
if (libcontacts_load_contact(*argv, &contact, user)) {
weprintf("libcontacts_load_contact %s: %s\n", *argv,
errno ? strerror(errno) : "contact file is malformatted");
ret = 1;
continue;
}
if (contact.photos) {
for (i = 0; contact.photos[i]; i++)
if (!strcmp(contact.photos[i], photo))
break;
r = &contact.photos[i];
if (!remove && !*r)
goto add_photo;
if (remove && *r) {
free(*r);
for (w = r++; (*w++ = *r++););
if (libcontacts_save_contact(&contact, user)) {
weprintf("libcontacts_save_contact %s:", *argv);
ret = 1;
}
}
} else if (!remove) {
i = 0;
add_photo:
contact.photos = erealloc(contact.photos, (i + 2) * sizeof(*contact.photos));
contact.photos[i + 1] = NULL;
contact.photos[i] = photo;
if (libcontacts_save_contact(&contact, user)) {
weprintf("libcontacts_save_contact %s:", *argv);
ret = 1;
}
contact.photos[i] = NULL;
}
libcontacts_contact_destroy(&contact);
}
free(newpath);
return ret;
}
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