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static int
hex2int(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else
return -1;
}
int
osc7parsecwd(const char *uri)
{
const char *auth, *host, *hostend;
char *path, decoded[PATH_MAX], thishost[_POSIX_HOST_NAME_MAX];
size_t i, decodedlen, hostlen, urilen;
int h1, h2;
if (!term.cwd) {
term.cwd = xmalloc(sizeof(decoded));
term.cwd[0] = '\0';
}
/* reset cwd if uri is empty */
if ((urilen = strlen(uri)) == 0) {
term.cwd[0] = '\0';
return 1;
}
/* decode uri */
for (decodedlen = 0, i = 0; i < urilen; i++) {
if (uri[i] == '%' && i <= urilen-3 &&
(h1 = hex2int(uri[i+1])) >= 0 && (h2 = hex2int(uri[i+2])) >= 0) {
decoded[decodedlen++] = (h1 << 4) | h2;
i += 2;
} else {
decoded[decodedlen++] = uri[i];
}
if (decodedlen == sizeof(decoded)) {
fprintf(stderr, "erresc (OSC 7): uri is too long\n");
return 0;
}
}
decoded[decodedlen] = '\0';
/* check scheme */
if (decodedlen < 5 || strncmp("file:", decoded, 5) != 0) {
fprintf(stderr, "erresc (OSC 7): scheme is not supported: '%s'\n", uri);
return 0;
}
/* find start of authority */
if (decodedlen < 7 || decoded[5] != '/' || decoded[6] != '/') {
fprintf(stderr, "erresc (OSC 7): invalid uri: '%s'\n", uri);
return 0;
}
auth = decoded + 7;
/* find start of path and reset cwd if path is missing */
if ((path = strchr(auth, '/')) == NULL) {
term.cwd[0] = '\0';
return 1;
}
/* ignore path if host is not localhost */
host = ((host = memchr(auth, '@', path - auth)) != NULL) ? host+1 : auth;
hostend = ((hostend = memchr(host, ':', path - host)) != NULL) ? hostend : path;
hostlen = hostend - host;
if (gethostname(thishost, sizeof(thishost)) < 0)
thishost[0] = '\0';
if (hostlen > 0 &&
!(hostlen == 9 && strncmp("localhost", host, hostlen) == 0) &&
!(hostlen == strlen(thishost) && strncmp(host, thishost, hostlen) == 0)) {
return 0;
}
memcpy(term.cwd, path, decodedlen - (path - decoded) + 1);
return 1;
}
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