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Much, much smaller. :)
This commit is contained in:
Michael Brown
parent
6791aeb024
commit
c1253d2219
183
src/core/url.c
183
src/core/url.c
@ -1,144 +1,71 @@
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#include "stdlib.h"
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#include "string.h"
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#include "proto.h"
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#include "resolv.h"
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#include "url.h"
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static struct protocol protocols[0] __protocol_start;
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static struct protocol default_protocols[0] __default_protocol_start;
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static struct protocol protocols_end[0] __protocol_end;
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/*
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* Parse protocol portion of a URL. Return 0 if no "proto://" is
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* present.
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*
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*/
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static inline int parse_protocol ( struct url_info *info, const char **p ) {
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const char *q = *p;
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info->protocol = q;
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for ( ; *q ; q++ ) {
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if ( memcmp ( q, "://", 3 ) == 0 ) {
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info->protocol_len = q - info->protocol;
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*p = q + 3;
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return 1;
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}
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}
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return 0;
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}
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/*
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* Parse the host:port portion of a URL. Also fills in sin_port.
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*
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*/
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static inline void parse_host_port ( struct url_info *info, const char **p ) {
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info->host = *p;
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for ( ; **p && ( **p != '/' ) ; (*p)++ ) {
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if ( **p == ':' ) {
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info->host_len = *p - info->host;
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info->port = ++(*p);
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info->sin.sin_port = strtoul ( *p, p, 10 );
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info->port_len = *p - info->port;
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return;
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}
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}
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/* No ':' separator seen; it's all the host part */
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info->host_len = *p - info->host;
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}
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/*
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* Identify the protocol
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*
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*/
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static inline int identify_protocol ( struct url_info *info ) {
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struct protocol *proto;
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if ( info->protocol_len ) {
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char *terminator;
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char temp;
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/* Explcitly specified protocol */
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terminator = ( char * ) &info->protocol[info->protocol_len];
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temp = *terminator;
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*terminator = '\0';
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for ( proto = protocols ; proto < protocols_end ; proto++ ) {
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if ( memcmp ( proto->name, info->protocol,
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info->protocol_len + 1 ) == 0 ) {
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info->proto = proto;
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break;
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}
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}
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*terminator = temp;
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} else {
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/* No explicitly specified protocol */
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if ( default_protocols < protocols_end )
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info->proto = default_protocols;
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}
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return ( ( int ) info->proto ); /* NULL indicates failure */
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}
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/*
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* Resolve the host portion of the URL
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*
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*/
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static inline int resolve_host ( struct url_info *info ) {
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char *terminator;
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char temp;
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int success;
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if ( ! info->host_len ) {
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/* No host specified - leave sin.sin_addr empty to
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* indicate use of DHCP-supplied next-server
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*/
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return 1;
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}
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terminator = ( char * ) &info->host[info->host_len];
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temp = *terminator;
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*terminator = '\0';
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success = resolv ( &info->sin.sin_addr, info->host );
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*terminator = temp;
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return success;
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}
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/*
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* Parse a URL string into its constituent parts. Perform name
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* resolution if required (and if resolver code is linked in), and
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* identify the protocol.
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* Parse a URL string into its constituent parts.
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*
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* We accept URLs of the form
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*
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* [protocol://[host][:port]/]path/to/file
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*
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* We return true for success, 0 for failure (e.g. unknown protocol).
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* Note that the "/" before path/to/file *will* be counted as part of
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* the filename, if it is present.
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* The URL string will be modified by having NULs inserted after
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* "protocol", "host" and "port". The original URL can be
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* reconstructed by calling unparse_url.
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*
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*/
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int parse_url ( struct url_info *info, const char *url ) {
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const char *p;
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void parse_url ( struct url_info *info, char *url ) {
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char *p;
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/* Fill in initial values */
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/* Zero the structure */
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memset ( info, 0, sizeof ( *info ) );
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info->url = url;
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info->protocol = url;
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info->host = url;
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info->port = url;
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/* Search for a protocol delimiter */
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for ( p = url ; *p ; p++ ) {
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if ( memcmp ( p, "://", 3 ) != 0 )
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continue;
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/* URL has an explicit protocol */
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info->protocol = url;
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*p = '\0';
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p += 3;
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info->host = p;
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/* Search for port or file delimiter */
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for ( ; *p ; p++ ) {
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if ( *p == ':' ) {
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*p = '\0';
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info->port = p + 1;
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continue;
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}
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if ( *p == '/' ) {
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*(p++) = '\0';
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break;
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}
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}
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info->file = p;
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return;
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}
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/* URL has no explicit protocol; is just a filename */
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info->file = url;
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/* Split the URL into substrings, and fill in sin.sin_port */
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p = url;
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if ( parse_protocol ( info, &p ) )
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parse_host_port ( info, &p );
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info->file = p;
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/* Identify the protocol */
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if ( ! identify_protocol ( info ) )
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return 0;
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/* Resolve the host name to an IP address */
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if ( ! resolve_host ( info ) )
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return 0;
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return 1;
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}
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/*
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* Restore a parsed URL to its original pristine form.
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*
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*/
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char * unparse_url ( struct url_info *info ) {
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if ( info->protocol ) {
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/* URL had a protocol: fill in the deleted separators */
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info->file[-1] = '/';
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if ( info->port ) {
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info->port[-1] = ':';
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}
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info->host[-3] = ':';
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return info->protocol;
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} else {
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/* URL had no protocol; was just a filename */
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return info->file;
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}
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}
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