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#include <string.h>
#include "urlutils.h"
static const gchar *skip_scheme(const char *url);
static gboolean is_scheme_character(gchar c);
gchar *relative_url_to_absolute(const gchar *baseurl, const gchar *href) {
gchar *absolute;
gchar *prefix;
const gchar *postfix = href;
if ((href[0] == '/') && (href[1] == '/')) {
gchar *scheme = url_scheme(baseurl);
prefix = g_strconcat(scheme, ":", NULL);
g_free(scheme);
} else if (href[0] == '/') {
prefix = url_root(baseurl);
if (g_str_has_suffix(prefix, "/")) {
postfix = href+1;
}
} else if (href[0] == '?') {
prefix = url_path_including_file(baseurl);
} else if (href[0] =='#') {
prefix = url_path_and_query(baseurl);
} else if (strstr(href, "://") == NULL) {
prefix = url_path_dirname(baseurl);
} else {
// href is absolute
prefix = NULL;
}
if (prefix) {
absolute = g_strconcat(prefix, postfix, NULL);
g_free(prefix);
} else {
absolute = g_strdup(href);
}
return absolute;
}
gchar *url_scheme(const gchar *url) {
if (!url)
return NULL;
const gchar *scheme_end = skip_scheme(url);
if (scheme_end == url) {
// no scheme
return g_strdup("");
} else {
// scheme found
// Do not include :// in the return value
g_assert(scheme_end >= url+3);
return g_strndup(url, scheme_end-3 - url);
}
}
gchar *url_root(const gchar *url) {
if (!url)
return NULL;
const gchar *authority = skip_scheme(url);
size_t authority_len = strcspn(authority, "/?#");
const gchar *authority_end = authority + authority_len;
gchar *root_without_slash = g_strndup(url, authority_end - url);
gchar *root = g_strconcat(root_without_slash, "/", NULL);
g_free(root_without_slash);
return root;
}
gchar *url_path_including_file(const gchar *url) {
if (!url)
return NULL;
const gchar *scheme_end = skip_scheme(url);
size_t path_len = strcspn(scheme_end, "?#");
const gchar *end = scheme_end + path_len;
gchar *path = g_strndup(url, end - url);
if (memchr(scheme_end, '/', path_len) == NULL) {
gchar *path2 = g_strconcat(path, "/", NULL);
g_free(path);
path = path2;
}
return path;
}
gchar *url_path_dirname(const gchar *url) {
if (!url)
return NULL;
const gchar *scheme_end = skip_scheme(url);
size_t path_len = strcspn(scheme_end, "?#");
const gchar *p = scheme_end + path_len;
while ((p >= url) && (*p != '/')) {
p--;
}
if (*p == '/') {
return g_strndup(url, (p+1) - url);
} else {
return g_strdup("/");
}
}
gchar *url_path_and_query(const gchar *url) {
if (!url)
return NULL;
const gchar *scheme_end = skip_scheme(url);
size_t path_len = strcspn(scheme_end, "#");
const gchar *end = scheme_end + path_len;
return g_strndup(url, end - url);
}
const gchar *skip_scheme(const char *url) {
const gchar *c = url;
while (is_scheme_character(*c)) {
c++;
}
if (strncmp(c, "://", 3) == 0) {
// scheme found
return c + 3;
} else {
// schemeless url
return url;
}
}
gboolean is_scheme_character(gchar c) {
return g_ascii_isalnum(c) || (c == '+') || (c == '-') || (c == '.');
}
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