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