78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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/* $NetBSD: expandm.c,v 1.1 2019/01/11 20:37:30 christos Exp $ */
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/*-
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* Copyright (c) 2018 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: expandm.c,v 1.1 2019/01/11 20:37:30 christos Exp $");
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "expandm.h"
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char * __attribute__((__format_arg__(1)))
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expandm(const char *fmt, const char *sf)
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{
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const char *e = strerror(errno);
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char *buf, *m, *nbuf;
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const char *ptr;
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for (ptr = fmt, buf = NULL; (m = strstr(ptr, "%m")); ptr = m + 2) {
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size_t cnt = 0;
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for (char *p = m; p >= ptr && *p == '%'; p--)
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cnt++;
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if (asprintf(&nbuf, "%s%.*s%s", buf ? buf : "",
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(int)(m - ptr), ptr, (cnt & 1) ? e : "%%m") == -1)
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goto out;
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free(buf);
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buf = nbuf;
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}
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if (asprintf(&nbuf, "%s%s%s", buf ? buf : "", ptr, sf ? sf : "") == -1)
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goto out;
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free(buf);
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return nbuf;
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out:
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free(buf);
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return __UNCONST(fmt);
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}
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#ifdef TEST
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int
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main(int argc, char *argv[])
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{
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errno = ERANGE;
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printf("%s\n", expandm(argv[1]));
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return 0;
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}
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#endif
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