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-rw-r--r--src/util/percentm.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/src/util/percentm.c b/src/util/percentm.c
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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));
+}
+