text: /****************************************************************************
   * netutils/netlib/netlib_parsehttpurl.c
   *
   *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <string.h>
  #include <errno.h>
  
  #include "netutils/netlib.h"
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  static const char g_http[] = "http://";
  #define HTTPLEN 7
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: netlib_parsehttpurl
   ****************************************************************************/
  
  int netlib_parsehttpurl(FAR const char *url, FAR uint16_t *port,
                          FAR char *hostname, int hostlen,
                          FAR char *filename, int namelen)
  {
    FAR const char *src = url;
    FAR char *dest;
    int bytesleft;
    int ret = OK;
    size_t pathlen;
  
    /* A valid HTTP URL must begin with http:// if it does not, we will assume
     * that it is a file name only, but still return an error.  wget() depends
     * on this strange behavior.
     */
  
    if (strncmp(src, g_http, HTTPLEN) != 0)
      {
        ret = -EINVAL;
      }
    else
      {
        /* Skip over the http:// */
  
        src += HTTPLEN;
  
        /* Concatenate the hostname following http:// and up to the termnator */
  
        dest      = hostname;
        bytesleft = hostlen;
  
        while (*src != '\0' && *src != '/' && *src != ' ' && *src != ':')
          {
            /* Make sure that there is space for another character in the
             * hostname (reserving space for the null terminator).
             */
  
            if (bytesleft > 1)
              {
                /* Copy the byte */
  
                *dest++ = *src++;
                bytesleft--;
              }
            else
              {
                /* Note the error, but continue parsing until the end of the
                 * hostname
                 */
  
                src++;
                ret = -E2BIG;
              }
          }
  
        *dest = '\0';
  
        /* Check if the hostname is following by a port number */
  
        if (*src == ':')
          {
            uint16_t accum = 0;
            src++; /* Skip over the colon */
  
            while (*src >= '0' && *src <= '9')
              {
                accum = 10*accum + *src - '0';
                src++;
              }
  
            *port = accum;
          }
      }
  
    /* The rest of the line is the file name */
  
    if (*src == '\0' || *src == ' ')
      {
        ret = -ENOENT;
      }
  
    /* Make sure the file name starts with exactly one '/' */
  
    dest      = filename;
    bytesleft = namelen;
  
    while (*src == '/')
      {
        src++;
      }
  
    *dest++ = '/';
    bytesleft--;
  
    /* The copy the rest of the file name to the user buffer */
  
    pathlen = strlen(src);
    if (bytesleft >= pathlen + 1)
      {
        memcpy(dest, src, pathlen);
        dest[pathlen] = '\0';
      }
    else
      {
        dest[0] = '\0';
        ret = -E2BIG;
      }
  
    return ret;
  }
  