cozis/url.c
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First version of the URL builder

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cozis
2025-12-06 13:20:09 +01:00
parent cbae957022
commit 4871f5168d
5 changed files with 246 additions and 1 deletions
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build.bat
+1
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@@ -2,3 +2,4 @@ gcc -o 000_parse.exe examples/000_parse.c url.c -I. -Wall -Wextr
gcc -o 001_serialize.exe examples/001_serialize.c url.c -I. -Wall -Wextra -ggdb
gcc -o 002_partial_parse.exe examples/002_partial_parse.c url.c -I. -Wall -Wextra -ggdb
gcc -o 003_references.exe examples/003_references.c url.c -I. -Wall -Wextra -ggdb
gcc -o 004_build.exe examples/004_build.c url.c -I. -Wall -Wextra -ggdb
build.sh
+1
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@@ -2,3 +2,4 @@ gcc -o 000_parse.out examples/000_parse.c url.c -I. -Wall -Wextr
gcc -o 001_serialize.out examples/001_serialize.c url.c -I. -Wall -Wextra -ggdb
gcc -o 002_partial_parse.out examples/002_partial_parse.c url.c -I. -Wall -Wextra -ggdb
gcc -o 003_references.out examples/003_references.c url.c -I. -Wall -Wextra -ggdb
gcc -o 004_build.out examples/004_build.c url.c -I. -Wall -Wextra -ggdb
examples/004_build.c
+33
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@@ -0,0 +1,33 @@
#include <url.h>
#include <stdio.h>
int main(void)
{
URL_Builder builder;
url_builder_init(&builder);
url_builder_set_scheme(&builder, "http", -1);
url_builder_set_username(&builder, "cozis", -1);
url_builder_set_password(&builder, "my_secret", -1);
url_builder_set_host_name(&builder, "www.ex@mple.com", -1);
url_builder_set_path(&builder, "/../../index.html", -1);
char url[1<<9];
int len = url_builder_finalize(&builder, url, sizeof(url));
if (len < 0) {
printf("Couldn't build URL\n");
return -1;
}
if (len >= (int) sizeof(url)) {
printf("URL buffer is too small\n");
return -1;
}
url[len] = '\0';
printf("Built URL: %s\n", url);
return 0;
}
url.c
+175 -1
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@@ -35,7 +35,7 @@
#define UINT16_MAX (URL_u16) ((1 << 16)-1)
#define NULL ((void*) 0)
#define S(X) ((URL_String) { (X), sizeof(X)-1 })
#define S(X) (URL_String) { (X), sizeof(X)-1 }
#define EMPTY (URL_String) { NULL, 0 }
#define SLICE(src, off, end) (URL_String) { src + off, end - off }
@@ -49,6 +49,14 @@ static void memcpy_(char *dst, char *src, int len)
}
#endif
static int strlen_(char *s)
{
int n = 0;
while (s[n] != '\0')
n++;
return n;
}
static URL_b32 streq(URL_String a, URL_String b)
{
if (a.len != b.len)
@@ -784,6 +792,13 @@ static void append(Builder *b, URL_String s)
b->len += s.len;
}
static void appendc(Builder *b, char c)
{
if (b->len < b->cap)
b->dst[b->len] = c;
b->len++;
}
static void append_port(Builder *b, URL_u16 port)
{
char buf[sizeof("65536")-1];
@@ -998,3 +1013,162 @@ int url_percent_decode(URL_String str, char *dst, int cap)
}
return wr;
}
static void append_percent_encoded(Builder *b, URL_String str, URL_b32 (*testfn)(char c))
{
for (int i = 0; i < str.len; i++) {
char c = str.ptr[i];
if (testfn(c))
appendc(b, str.ptr[i]);
else {
static const char table[] = "0123456789abcdef";
appendc(b, '%');
appendc(b, table[(URL_u8) c >> 4]);
appendc(b, table[(URL_u8) c & 0xF]);
}
}
}
void url_builder_init(URL_Builder *ub)
{
ub->scheme = EMPTY;
ub->username = EMPTY;
ub->password = EMPTY;
ub->host_type = URL_HOST_EMPTY;
ub->no_port = 1;
ub->port = 0;
ub->path = EMPTY;
ub->query = EMPTY;
ub->fragment = EMPTY;
}
void url_builder_set_scheme(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->scheme = (URL_String) { str, len };
}
void url_builder_set_username(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->username = (URL_String) { str, len };
}
void url_builder_set_password(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->password = (URL_String) { str, len };
}
void url_builder_set_host_name(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->host_type = URL_HOST_NAME;
ub->host_name = (URL_String) { str, len };
}
void url_builder_set_host_ipv4(URL_Builder *ub, URL_IPv4 ipv4)
{
ub->host_type = URL_HOST_IPV4;
ub->host_ipv4 = ipv4;
}
void url_builder_set_host_ipv6(URL_Builder *ub, URL_IPv6 ipv6)
{
ub->host_type = URL_HOST_IPV6;
ub->host_ipv6 = ipv6;
}
void url_builder_set_port(URL_Builder *ub, URL_u16 port)
{
ub->no_port = 0;
ub->port = port;
}
void url_builder_set_path(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->path = (URL_String) { str, len };
}
void url_builder_set_query(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->query = (URL_String) { str, len };
}
void url_builder_set_fragment(URL_Builder *ub, char *str, int len)
{
if (len < 0) len = str ? strlen_(str) : 0;
ub->fragment = (URL_String) { str, len };
}
int url_builder_finalize(URL_Builder *ub, char *dst, int cap)
{
Builder b = { dst, cap, 0 };
// Validate and append the schema
{
if (ub->scheme.len == 0 || !is_scheme_first(ub->scheme.ptr[0]))
return -1;
for (int i = 1; i < ub->scheme.len; i++)
if (!is_scheme(ub->scheme.ptr[i]))
return -1;
append(&b, ub->scheme);
}
URL_b32 authority = 0;
if (ub->username.len > 0 || ub->password.len > 0 || ub->host_type != URL_HOST_EMPTY || ub->no_port == 0) {
authority = 1;
appendc(&b, '/');
appendc(&b, '/');
if (ub->username.len > 0 || ub->password.len > 0) {
append_percent_encoded(&b, ub->username, is_userinfo);
appendc(&b, ':');
append_percent_encoded(&b, ub->password, is_userinfo);
appendc(&b, '@');
}
switch (ub->host_type) {
case URL_HOST_EMPTY:
// Do nothing
break;
case URL_HOST_NAME:
append_percent_encoded(&b, ub->host_name, is_reg_name);
break;
case URL_HOST_IPV4:
ASSERT(0); // TODO
break;
case URL_HOST_IPV6:
appendc(&b, '[');
ASSERT(0);
appendc(&b, ']');
break;
}
if (ub->no_port == 0) {
appendc(&b, ':');
append_port(&b, ub->port);
}
}
if (ub->path.len > 0) {
// If an authority is present, the path can't be relative
if (authority && ub->path.ptr[0] != '/')
return -1;
PathComps comps = {0};
if (resolve_dots_and_append_comps(&comps, ub->path) < 0)
return -1;
for (int i = 0; i < comps.count; i++) {
if (i > 0 || comps.first_slash)
append(&b, S("/"));
append_percent_encoded(&b, comps.stack[i], is_pchar);
}
if (comps.trailing_slash)
append(&b, S("/"));
}
append_query(&b, ub->query);
append_fragment(&b, ub->fragment);
return b.len;
}
url.h
+36
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@@ -45,6 +45,7 @@ typedef enum {
URL_HOST_NAME,
} URL_HostType;
// This struct's fields are strictly read-only.
typedef struct {
// Flags used to parse this URL
@@ -174,4 +175,39 @@ int url_percent_decode(URL_String str, char *dst, int cap);
// though it's just a best-effor normalization for now.
int url_serialize(URL url, URL *base, char *dst, int cap);
typedef struct {
URL_String scheme;
URL_String username;
URL_String password;
URL_HostType host_type;
union {
URL_String host_name;
URL_IPv4 host_ipv4;
URL_IPv6 host_ipv6;
};
URL_b32 no_port;
URL_u16 port;
URL_String path;
URL_String query;
URL_String fragment;
} URL_Builder;
void url_builder_init(URL_Builder *ub);
void url_builder_set_scheme(URL_Builder *ub, char *str, int len);
void url_builder_set_username(URL_Builder *ub, char *str, int len);
void url_builder_set_password(URL_Builder *ub, char *str, int len);
void url_builder_set_host_name(URL_Builder *ub, char *str, int len);
void url_builder_set_host_ipv4(URL_Builder *ub, URL_IPv4 ipv4);
void url_builder_set_host_ipv6(URL_Builder *ub, URL_IPv6 ipv6);
void url_builder_set_port(URL_Builder *ub, URL_u16 port);
void url_builder_set_path(URL_Builder *ub, char *str, int len);
void url_builder_set_query(URL_Builder *ub, char *str, int len);
void url_builder_set_fragment(URL_Builder *ub, char *str, int len);
int url_builder_finalize(URL_Builder *ub, char *dst, int cap);
#endif // URL_INCLUDED