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/*++
/* NAME
/* percentm 3
/* SUMMARY
/* expand %m embedded in string to system error text
/* SYNOPSIS
/* #include <percentm.h>
/*
/* char *percentm(const char *src, int err)
/* DESCRIPTION
/* The percentm() routine makes a copy of the null-terminated string
/* given via the \fIsrc\fR argument, with %m sequences replaced by
/* the system error text corresponding to the \fIerr\fR argument.
/* The result is overwritten upon each successive call.
/*
/* Arguments:
/* .IP src
/* A null-terminated input string with zero or more %m sequences.
/* .IP err
/* A legal \fIerrno\fR value. The text corresponding to this error
/* value is used when expanding %m sequences.
/* SEE ALSO
/* syslog(3) system logger library
/* HISTORY
/* .ad
/* .fi
/* A percentm() routine appears in the TCP Wrapper software
/* by Wietse Venema.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <string.h>
/* Utility library. */
#include "vstring.h"
#include "percentm.h"
/* percentm - replace %m by error message corresponding to value in err */
char *percentm(const char *str, int err)
{
static VSTRING *vp;
const unsigned char *ip = (const unsigned char *) str;
if (vp == 0)
vp = vstring_alloc(100); /* grows on demand */
VSTRING_RESET(vp);
while (*ip) {
switch (*ip) {
default:
VSTRING_ADDCH(vp, *ip++);
break;
case '%':
switch (ip[1]) {
default: /* leave %<any> alone */
VSTRING_ADDCH(vp, *ip++);
/* FALLTHROUGH */
case '\0': /* don't fall off end */
VSTRING_ADDCH(vp, *ip++);
break;
case 'm': /* replace %m */
vstring_strcat(vp, strerror(err));
ip += 2;
break;
}
}
}
VSTRING_TERMINATE(vp);
return (vstring_str(vp));
}
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