118 lines
3.4 KiB
Groff
118 lines
3.4 KiB
Groff
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.\" $NetBSD: efun.3,v 1.10 2010/05/03 05:40:37 jruoho Exp $
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.\"
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.\" Copyright (c) 2006 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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.Dd May 3, 2010
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.Dt EFUN 3
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.Os
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.Sh NAME
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.Nm esetfunc ,
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.Nm easprintf ,
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.Nm efopen ,
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.Nm emalloc ,
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.Nm ecalloc ,
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.Nm erealloc ,
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.Nm estrdup ,
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.Nm estrndup ,
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.Nm estrlcat ,
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.Nm estrlcpy ,
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.Nm evasprintf
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.Nd error-checked utility functions
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In util.h
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.Ft void (*)(int, const char *, ...)
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.Fn esetfunc "void (*)(int, const char *, ...)"
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.Ft int
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.Fn easprintf "char ** restrict str" "const char * restrict fmt" "..."
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.Ft FILE *
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.Fn efopen "const char *p" "const char *m"
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.Ft void *
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.Fn ecalloc "size_t n" "size_t c"
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.Ft void *
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.Fn emalloc "size_t n"
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.Ft void *
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.Fn erealloc "void *p" "size_t n"
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.Ft char *
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.Fn estrdup "const char *s"
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.Ft char *
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.Fn estrndup "const char *s" "size_t len"
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.Ft size_t
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.Fn estrlcat "char *dst" "const char *src" "size_t len"
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.Ft size_t
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.Fn estrlcpy "char *dst" "const char *src" "size_t len"
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.Ft int
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.Fn evasprintf "char ** restrict str" "const char * restrict fmt" "..."
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.Sh DESCRIPTION
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The
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.Fn easprintf ,
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.Fn efopen ,
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.Fn ecalloc ,
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.Fn emalloc ,
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.Fn erealloc ,
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.Fn estrdup ,
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.Fn estrndup ,
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.Fn estrlcat ,
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.Fn estrlcpy ,
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and
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.Fn evasprintf
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functions
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operate exactly as the corresponding functions that do not start with an
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.Sq e
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except that in case of an error, they call
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the installed error handler that can be configured with
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.Fn esetfunc .
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.Pp
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For the string handling functions, it is an error when the destination
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buffer is not large enough to hold the complete string.
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For functions that allocate memory or open a file, it is an error when
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they would return a null pointer.
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The default error handler is
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.Xr err 3 .
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The function
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.Fn esetfunc
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returns the previous error handler function.
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A
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.Dv NULL
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error handler will just call
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.Xr exit 3 .
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.Sh SEE ALSO
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.Xr asprintf 3 ,
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.Xr calloc 3 ,
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.Xr err 3 ,
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.Xr exit 3 ,
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.Xr fopen 3 ,
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.Xr malloc 3 ,
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.Xr realloc 3 ,
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.Xr strdup 3 ,
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.Xr strlcat 3 ,
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.Xr strlcpy 3 ,
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.Xr strndup 3 ,
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.Xr vasprintf 3
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