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misc.c revision 1.1 
      1  /*
      2   * Misc routines that are used by tcpd and by tcpdchk.
      3   *
      4   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
      5   */
      6 
      7 #ifndef lint
      8 static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
      9 #endif
     10 
     11 #include <sys/types.h>
     12 #include <sys/param.h>
     13 #include <netinet/in.h>
     14 #include <arpa/inet.h>
     15 #include <stdio.h>
     16 #include <string.h>
     17 
     18 #include "tcpd.h"
     19 
     20 extern char *fgets();
     21 
     22 #ifndef	INADDR_NONE
     23 #define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
     24 #endif
     25 
     26 /* xgets - fgets() with backslash-newline stripping */
     27 
     28 char   *xgets(ptr, len, fp)
     29 char   *ptr;
     30 int     len;
     31 FILE   *fp;
     32 {
     33     int     got;
     34     char   *start = ptr;
     35 
     36     while (fgets(ptr, len, fp)) {
     37 	got = strlen(ptr);
     38 	if (got >= 1 && ptr[got - 1] == '\n') {
     39 	    tcpd_context.line++;
     40 	    if (got >= 2 && ptr[got - 2] == '\\') {
     41 		got -= 2;
     42 	    } else {
     43 		return (start);
     44 	    }
     45 	}
     46 	ptr += got;
     47 	len -= got;
     48 	ptr[0] = 0;
     49     }
     50     return (ptr > start ? start : 0);
     51 }
     52 
     53 /* split_at - break string at delimiter or return NULL */
     54 
     55 char   *split_at(string, delimiter)
     56 char   *string;
     57 int     delimiter;
     58 {
     59     char   *cp;
     60 
     61     if ((cp = strchr(string, delimiter)) != 0)
     62 	*cp++ = 0;
     63     return (cp);
     64 }
     65 
     66 /* dot_quad_addr - convert dotted quad to internal form */
     67 
     68 unsigned long dot_quad_addr(str)
     69 char   *str;
     70 {
     71     int     in_run = 0;
     72     int     runs = 0;
     73     char   *cp = str;
     74 
     75     /* Count the number of runs of non-dot characters. */
     76 
     77     while (*cp) {
     78 	if (*cp == '.') {
     79 	    in_run = 0;
     80 	} else if (in_run == 0) {
     81 	    in_run = 1;
     82 	    runs++;
     83 	}
     84 	cp++;
     85     }
     86     return (runs == 4 ? inet_addr(str) : INADDR_NONE);
     87 }
     88