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url: refactor the check for Windows drive letter in path

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- Move the logic to detect a Windows drive letter prefix
  (eg c: in c:foo) into a function-like macro.

Closes https://github.com/curl/curl/pull/1571
This commit is contained in:
Jay Satiro 2017-06-13 21:42:59 -04:00
parent ec92afc3f4
commit 2a733d6418
1 changed files with 11 additions and 16 deletions
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27
lib/url.c
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@ -4363,11 +4363,16 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
return CURLE_URL_MALFORMAT;
}
/* Make sure we don't mistake a drive letter for a scheme, for example:
/* MSDOS/Windows style drive prefix, eg c: in c:foo */
#define STARTS_WITH_DRIVE_PREFIX(str) \
((('a' <= str[0] && str[0] <= 'z') || \
('A' <= str[0] && str[0] <= 'Z')) && \
(str[1] == ':'))
/* Don't mistake a drive letter for a scheme if the default protocol is file.
curld --proto-default file c:/foo/bar.txt */
if((('a' <= data->change.url[0] && data->change.url[0] <= 'z') ||
('A' <= data->change.url[0] && data->change.url[0] <= 'Z')) &&
data->change.url[1] == ':' && data->set.str[STRING_DEFAULT_PROTOCOL] &&
if(STARTS_WITH_DRIVE_PREFIX(data->change.url) &&
data->set.str[STRING_DEFAULT_PROTOCOL] &&
strcasecompare(data->set.str[STRING_DEFAULT_PROTOCOL], "file")) {
; /* do nothing */
}
@ -4386,8 +4391,6 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
if((url_has_scheme && strncasecompare(data->change.url, "file:", 5)) ||
(!url_has_scheme && data->set.str[STRING_DEFAULT_PROTOCOL] &&
strcasecompare(data->set.str[STRING_DEFAULT_PROTOCOL], "file"))) {
bool path_has_drive = FALSE;
if(url_has_scheme)
rc = sscanf(data->change.url, "%*15[^\n/:]:%[^\n]", path);
else
@ -4409,17 +4412,12 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
memmove(path, path + 2, strlen(path + 2)+1);
}
/* the path may start with a drive letter. for backwards compatibility
we skip some processing on those paths. */
path_has_drive = (('a' <= path[0] && path[0] <= 'z') ||
('A' <= path[0] && path[0] <= 'Z')) && path[1] == ':';
/*
* we deal with file://<host>/<path> differently since it supports no
* hostname other than "localhost" and "127.0.0.1", which is unique among
* the URL protocols specified in RFC 1738
*/
if(path[0] != '/' && !path_has_drive) {
if(path[0] != '/' && !STARTS_WITH_DRIVE_PREFIX(path)) {
/* the URL includes a host name, it must match "localhost" or
"127.0.0.1" to be valid */
char *ptr;
@ -4453,13 +4451,10 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
/* This cannot be made with strcpy, as the memory chunks overlap! */
memmove(path, ptr, strlen(ptr)+1);
path_has_drive = (('a' <= path[0] && path[0] <= 'z') ||
('A' <= path[0] && path[0] <= 'Z')) && path[1] == ':';
}
#if !defined(MSDOS) && !defined(WIN32) && !defined(__CYGWIN__)
if(path_has_drive) {
if(STARTS_WITH_DRIVE_PREFIX(path)) {
failf(data, "File drive letters are only accepted in MSDOS/Windows.");
return CURLE_URL_MALFORMAT;
}