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 #include <stdio.h>
   8 #include <errno.h>
   9 #include <string.h>
  10
  11 #ifndef SYS_ERRLIST_DEFINED
  12 extern char *sys_errlist[];
  13 extern int sys_nerr;
  14 #endif
  15
  16 #include "mystdarg.h"
  17
  18 char   *percent_m(obuf, ibuf)
  19 char   *obuf;
  20 char   *ibuf;
  21 {
  22     char   *bp = obuf;
  23     char   *cp = ibuf;
  24
  25     while ((*bp = *cp) != 0)
  26         if (*cp == '%' && cp[1] == 'm') {
  27             if (errno < sys_nerr && errno > 0) {
  28                 strcpy(bp, sys_errlist[errno]);
  29             } else {
  30                 sprintf(bp, "Unknown error %d", errno);
  31             }
  32             bp += strlen(bp);
  33             cp += 2;
  34         } else {
  35             bp++, cp++;
  36         }
  37     return (obuf);
  38 }