mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-23 13:52:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Add curl example (#42)

Browse source 
make -j8 o//examples/curl.com
    o//examples/curl.com http://justine.lol/ape.html
This commit is contained in:
Justine Tunney 2021-02-18 19:20:41 -08:00
parent 667ab245fe
commit 2c15efc249
29 changed files with 208 additions and 153 deletions
Download patch file Download diff file Expand all files Collapse all files

107
examples/curl.c Normal file
View file

@ -0,0 +1,107 @@
#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/bits/safemacros.h"
#include "libc/dns/dns.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/macros.h"
#include "libc/runtime/gc.h"
#include "libc/runtime/runtime.h"
#include "libc/sock/sock.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/af.h"
#include "libc/sysv/consts/ai.h"
#include "libc/sysv/consts/ipproto.h"
#include "libc/sysv/consts/shut.h"
#include "libc/sysv/consts/sock.h"
#include "libc/x/x.h"
#include "net/http/uri.h"
/**
* @fileoverview Downloads HTTP URL to stdout.
*
* make -j8 o//examples/curl.com
* o//examples/curl.com http://justine.lol/ape.html
*/
int main(int argc, char *argv[]) {
int sock;
ssize_t rc;
unsigned long need;
struct UriSlice path;
size_t i, got, toto, msglen;
char buf[1500], host[256], port[7];
const char *url, *msg, *pathstr, *crlfcrlf, *contentlength;
struct UriSlice us[16];
struct Uri u = {.segs.p = us, .segs.n = ARRAYLEN(us)};
struct addrinfo *addr, *addrs;
struct addrinfo hints = {.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP,
.ai_flags = AI_NUMERICSERV};
if (argc != 2) {
fprintf(stderr, "USAGE: %s URL\n", argv[0]);
exit(1);
}
url = argv[1];
CHECK_NE(-1, uriparse(&u, url, strlen(url)), "BAD URL: %`'s", url);
CHECK_EQ(kUriSchemeHttp, urischeme(u.scheme, url));
urislice2cstr(host, sizeof(host), u.host, url, "127.0.0.1");
urislice2cstr(port, sizeof(port), u.port, url, "80");
path = uripath(&u);
pathstr = path.n ? url + path.i : "/";
msg = gc(xstrcat("GET ", pathstr,
" HTTP/1.1\r\n"
"Host: ",
host,
"\r\n"
"Connection: close\r\n"
"Content-Length: 0\r\n"
"Accept: text/plain; */*\r\n"
"Accept-Encoding: identity\r\n"
"User-Agent: github.com/jart/cosmopolitan\r\n"
"\r\n"));
msglen = strlen(msg);
CHECK_EQ(EAI_SUCCESS, getaddrinfo(host, port, &hints, &addrs));
for (addr = addrs; addr; addr = addr->ai_next) {
CHECK_NE(-1, (sock = socket(addr->ai_family, addr->ai_socktype,
addr->ai_protocol)));
CHECK_NE(-1, connect(sock, addr->ai_addr, addr->ai_addrlen));
CHECK_EQ(msglen, write(sock, msg, msglen));
shutdown(sock, SHUT_WR);
buf[0] = '\0';
CHECK_NE(-1, (rc = read(sock, buf, sizeof(buf))));
got = rc;
CHECK(startswith(buf, "HTTP/1.1 200"), "%`'.*s", got, buf);
CHECK_NOTNULL((crlfcrlf = memmem(buf, got, "\r\n\r\n", 4)));
need =
strtol((char *)firstnonnull(
firstnonnull(
memmem(buf, crlfcrlf - buf, "\r\nContent-Length: ", 18),
memmem(buf, crlfcrlf - buf, "\r\ncontent-length: ", 18)),
"\r\nContent-Length: -1") +
18,
NULL, 10);
got = MIN(got - (crlfcrlf + 4 - buf), need);
CHECK_EQ(got, write(1, crlfcrlf + 4, got));
for (toto = got; toto < need; toto += got) {
CHECK_NE(-1, (rc = read(sock, buf, sizeof(buf))));
if (!(got = rc)) exit(18);
got = MIN(got, need - toto);
CHECK_EQ(got, write(1, buf, got));
}
LOGIFNEG1(close(sock));
break;
}
return 0;
}