uri.c

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#include "platform.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "gnunet_uri_lib.h"
 
 
static inline int
natoi (const char *str,
       size_t len)
{
  int i, r = 0;
  for (i = 0; i < len; i++) {
    r *= 10;
    r += str[i] - '0';
  }
 
  return r;
}
 
 
static inline int
is_relative (const char *url)
{
  return (*url == '/') ? 1 : 0;
}
 
 
static inline char *
parse_scheme (char *str)
{
  char *s;
 
  /* If not found or first in string, return error */
  s = strchr (str, ':');
  if (s == NULL || s == str) {
    return NULL;
  }
 
  /* If not followed by two slashes, return error */
  if (s[1] == '\0' || s[1] != '/' || s[2] == '\0' || s[2] != '/') {
    return NULL;
  }
 
  *s = '\0'; // Replace ':' with NULL
 
  return s + 3;
}
 
 
static inline char *
find_and_terminate (char *str,
                    char find)
{
  str = strchr(str, find);
  if (NULL == str) {
    return NULL;
  }
 
  *str = '\0';
  return str + 1;
}
 
 
/* Yes, the following functions could be implemented as preprocessor macros
     instead of inline functions, but I think that this approach will be more
     clean in this case. */
static inline char *
find_fragment (char *str)
{
  return find_and_terminate (str, '#');
}
 
 
static inline char *
find_query (char *str)
{
  return find_and_terminate (str, '?');
}
 
 
static inline char *
find_path (char *str)
{
  return find_and_terminate (str, '/');
}
 
 
int
GNUNET_uri_parse (struct GNUNET_Uri *url,
                  char *u)
{
  if (NULL == url || NULL == u) {
    return -1;
  }
 
  memset(url, 0, sizeof (struct GNUNET_Uri));
 
  /* (Fragment) */
  url->fragment = find_fragment (u);
 
  /* (Query) */
  url->query = find_query (u);
 
  /* Relative URL? Parse scheme and hostname */
  if (!is_relative (u)) {
    /* Scheme */
    url->scheme = u;
    u = parse_scheme (u);
    if (u == NULL) {
      return -1;
    }
 
    /* Host */
    if ('\0' == *u) {
      return -1;
    }
    url->host = u;
 
    /* (Path) */
    url->path = find_path (u);
 
    /* (Credentials) */
    u = strchr (url->host, '@');
    if (NULL != u) {
      /* Missing credentials? */
      if (u == url->host) {
        return -1;
      }
 
      url->username = url->host;
      url->host = u + 1;
      *u = '\0';
 
      u = strchr (url->username, ':');
      if (NULL == u) {
        return -1;
      }
 
      url->password = u + 1;
      *u = '\0';
    }
 
    /* Missing hostname? */
    if ('\0' == *url->host) {
      return -1;
    }
 
    /* (Port) */
    u = strchr (url->host, ':');
    if (NULL != u && (NULL == url->path || u < url->path)) {
      *(u++) = '\0';
      if ('\0' == *u) {
        return -1;
      }
 
      if (url->path) {
        url->port = natoi (u, url->path - u - 1);
      } else {
        url->port = atoi (u);
      }
    }
 
    /* Missing hostname? */
    if ('\0' == *url->host) {
      return -1;
    }
  } else {
    /* (Path) */
    url->path = find_path (u);
  }
 
  return 0;
}
 
 
int
GNUNET_uri_split_path (char *path,
                       char **parts,
                       int max_parts)
{
  int i = 0;
 
  if (NULL == path || '\0' == *path) {
    return -1;
  }
 
  do {
    /* Forward to after slashes */
    while (*path == '/') path++;
 
    if ('\0' == *path) {
      break;
    }
 
    parts[i++] = path;
 
    path = strchr (path, '/');
    if (NULL == path) {
      break;
    }
 
    *(path++) = '\0';
  } while (i < max_parts);
 
  return i;
}
 
 
int
GNUNET_uri_parse_query (char *query,
                        char delimiter,
                        struct GNUNET_UriParam *params,
                        int max_params)
{
  int i = 0;
 
  if (NULL == query || '\0' == *query) {
    return -1;
  }
 
  params[i++].key = query;
  while (i < max_params && NULL != (query = strchr (query, delimiter))) {
    *query = '\0';
    params[i].key = ++query;
    params[i].val = NULL;
 
    /* Go back and split previous param */
    if (i > 0) {
      if ((params[i - 1].val = strchr (params[i - 1].key, '=')) != NULL) {
        *(params[i - 1].val)++ = '\0';
      }
    }
    i++;
  }
 
  /* Go back and split last param */
  if ((params[i - 1].val = strchr (params[i - 1].key, '=')) != NULL) {
    *(params[i - 1].val)++ = '\0';
  }
 
  return i;
}