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misc.c

 /*
  * Misc routines that are used by tcpd and by tcpdchk.
  * 
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>

#include "tcpd.h"

extern char *fgets();

#ifndef     INADDR_NONE
#define     INADDR_NONE (-1)        /* XXX should be 0xffffffff */
#endif

/* xgets - fgets() with backslash-newline stripping */

char   *xgets(ptr, len, fp)
char   *ptr;
int     len;
FILE   *fp;
{
    int     got;
    char   *start = ptr;

    while (fgets(ptr, len, fp)) {
      got = strlen(ptr);
      if (got >= 1 && ptr[got - 1] == '\n') {
          tcpd_context.line++;
          if (got >= 2 && ptr[got - 2] == '\\') {
            got -= 2;
          } else {
            return (start);
          }
      }
      ptr += got;
      len -= got;
      ptr[0] = 0;
    }
    return (ptr > start ? start : 0);
}

/* split_at - break string at delimiter or return NULL */

char   *split_at(string, delimiter)
char   *string;
int     delimiter;
{
    char   *cp;

    if ((cp = strchr(string, delimiter)) != 0)
      *cp++ = 0;
    return (cp);
}

/* dot_quad_addr - convert dotted quad to internal form */

unsigned long dot_quad_addr(str)
char   *str;
{
    int     in_run = 0;
    int     runs = 0;
    char   *cp = str;

    /* Count the number of runs of non-dot characters. */

    while (*cp) {
      if (*cp == '.') {
          in_run = 0;
      } else if (in_run == 0) {
          in_run = 1;
          runs++;
      }
      cp++;
    }
    return (runs == 4 ? inet_addr(str) : INADDR_NONE);
}

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