100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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/* @(#)snprintf.c 1.14 16/08/10 Copyright 1985, 1996-2016 J. Schilling */
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/*
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* Copyright (c) 1985, 1996-2016 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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* A copy of the CDDL is also available via the Internet at
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* http://www.opensource.org/licenses/cddl1.txt
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#define snprintf __nothing__ /* prototype may be wrong (e.g. IRIX) */
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#include <schily/mconfig.h>
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#include <schily/unistd.h> /* include <sys/types.h> try to get size_t */
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#include <schily/stdio.h> /* Try again for size_t */
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#include <schily/stdlib.h> /* Try again for size_t */
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#include <schily/varargs.h>
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#include <schily/standard.h>
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#include <schily/schily.h>
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#undef snprintf
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/*
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* If PORT_ONLY is defined, snprintf() will only be compiled in if it is
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* missing on the local platform. This is used by e.g. libschily.
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*/
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#if !defined(HAVE_SNPRINTF) || !defined(PORT_ONLY)
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EXPORT int snprintf __PR((char *, size_t maxcnt, const char *, ...));
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typedef struct {
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char *ptr;
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int count;
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} *BUF, _BUF;
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#ifdef PROTOTYPES
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static void
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_cput(char c, long l)
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#else
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static void
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_cput(c, l)
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char c;
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long l;
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#endif
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{
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register BUF bp = (BUF)l;
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if (--bp->count > 0) {
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*bp->ptr++ = c;
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} else {
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/*
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* Make sure that there will never be a negative overflow.
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*/
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bp->count++;
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}
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}
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/* VARARGS2 */
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#ifdef PROTOTYPES
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EXPORT int
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snprintf(char *buf, size_t maxcnt, const char *form, ...)
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#else
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EXPORT int
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snprintf(buf, maxcnt, form, va_alist)
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char *buf;
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unsigned maxcnt;
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char *form;
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va_dcl
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#endif
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{
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va_list args;
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int cnt;
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_BUF bb;
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bb.ptr = buf;
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bb.count = maxcnt;
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#ifdef PROTOTYPES
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va_start(args, form);
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#else
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va_start(args);
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#endif
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cnt = format(_cput, (long)&bb, form, args);
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va_end(args);
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if (maxcnt > 0)
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*(bb.ptr) = '\0';
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if (bb.count < 0)
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return (-1);
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return (cnt);
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}
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#endif /* !defined(HAVE_SNPRINTF) || !defined(PORT_ONLY) */
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