contrib/tcp_wrappers/percent_m.c

   1  /*
   2   * Replace %m by system error message.
   3   *
   4   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
   5   */
   6
   7 #ifndef lint
   8 static char sccsid[] = "@(#) percent_m.c 1.1 94/12/28 17:42:37";
   9 #endif
  10
  11 #include <stdio.h>
  12 #include <errno.h>
  13 #include <string.h>
  14
  15 #ifndef SYS_ERRLIST_DEFINED
  16 extern char *sys_errlist[];
  17 extern int sys_nerr;
  18 #endif
  19
  20 #include "mystdarg.h"
  21
  22 char   *percent_m(obuf, ibuf)
  23 char   *obuf;
  24 char   *ibuf;
  25 {
  26     char   *bp = obuf;
  27     char   *cp = ibuf;
  28
  29     while (*bp = *cp)
  30         if (*cp == '%' && cp[1] == 'm') {
  31             if (errno < sys_nerr && errno > 0) {
  32                 strcpy(bp, sys_errlist[errno]);
  33             } else {
  34                 sprintf(bp, "Unknown error %d", errno);
  35             }
  36             bp += strlen(bp);
  37             cp += 2;
  38         } else {
  39             bp++, cp++;
  40         }
  41     return (obuf);
  42 }