rebasing .git

usr/lib/c/curl-homemade.c

@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+#define BUFFER_CHUNK 4096
+
+/* ---------------------- URL PARSING ---------------------- */
+void parse_url(const char *input, char *host, size_t hsz, char *path, size_t psz)
+{
+    const char *slash = strchr(input, '/');
+
+    if (slash) {
+        size_t host_len = slash - input;
+        if (host_len >= hsz) host_len = hsz - 1;
+        strncpy(host, input, host_len);
+        host[host_len] = '\0';
+        snprintf(path, psz, "%s", slash);
+    } else {
+        snprintf(host, hsz, "%s", input);
+        snprintf(path, psz, "/");
+    }
+}
+
+/* ---------------------- CONNECT TO HOST ---------------------- */
+int connect_to_host(const char *host)
+{
+    struct addrinfo hints = {0}, *res;
+    hints.ai_family = AF_INET;
+    hints.ai_socktype = SOCK_STREAM;
+
+    getaddrinfo(host, "80", &hints, &res);
+
+
+    int sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+    if (sock < 0) {
+        perror("socket");
+        freeaddrinfo(res);
+        return -1;
+    }
+
+    if (connect(sock, res->ai_addr, res->ai_addrlen) < 0) {
+        perror("connect");
+        close(sock);
+        freeaddrinfo(res);
+        return -1;
+    }
+
+    freeaddrinfo(res);
+    return sock;
+}
+
+/* ---------------------- SEND HTTP GET REQUEST ---------------------- */
+int send_request(int sock, const char *host, const char *path)
+{
+    char req[1024];
+    snprintf(req, sizeof(req),
+             "GET %s HTTP/1.0\r\n"
+             "Host: %s\r\n"
+             "User-Agent: basic-c-client\r\n"
+             "\r\n",
+             path, host);
+
+    return send(sock, req, strlen(req), 0);
+}
+
+/* ---------------------- DOWNLOAD RESPONSE ---------------------- */
+char *download_response(int sock, size_t *out_size)
+{
+    char *filedata = NULL;
+    *out_size = 0;
+
+    char buffer[BUFFER_CHUNK];
+    ssize_t bytes;
+
+    while ((bytes = recv(sock, buffer, sizeof(buffer), 0)) > 0) {
+        char *newbuf = realloc(filedata, *out_size + bytes + 1);
+        if (!newbuf) {
+            fprintf(stderr, "Out of memory\n");
+            free(filedata);
+            return NULL;
+        }
+
+        filedata = newbuf;
+        memcpy(filedata + *out_size, buffer, bytes);
+        *out_size += bytes;
+        filedata[*out_size] = '\0';
+    }
+
+    return filedata;
+}
+
+/* ---------------------- MAIN PROGRAM ---------------------- */
+int main(int argc, char **argv)
+{
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s <host/path>\n", argv[0]);
+        return 1;
+    }
+
+    char host[256];
+    char path[512];
+    parse_url(argv[1], host, sizeof(host), path, sizeof(path));
+
+    int sock = connect_to_host(host);
+    if (sock < 0) return 1;
+
+    send_request(sock, host, path);
+
+    size_t filesize;
+    char *filedata = download_response(sock, &filesize);
+    close(sock);
+
+    if (!filedata) return 1;
+
+    printf("Received %zu bytes:\n\n%s\n", filesize, filedata);
+	f = open(argv[2], "w");
+	write(f, filedata, filesize);
+
+    free(filedata);
+    return 0;
+}
+