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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: ac_as_dirname
</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">
<a href="http://autoconf-archive.cryp.to/ac_as_dirname.m4">Download M4
Source</a>
</td>
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<a href="macros-by-category.html">Macro Index Page</a>
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<hr>
<h1>
ac_as_dirname
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Autoconf 2.5x makes this unnecessary.
</p>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_AS_DIRNAME (PATH)</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
this is the macro AS_DIRNAME from autoconf 2.4x defined here for use in
autoconf 2.1x, remove the AC_ when you use 2.4x
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-25
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_ECHO_MKFILE],
[dnl
case $2 in
*/*) P=` AC_AS_DIRNAME($2) ` ; AC_AS_MKDIR_P($P) ;;
esac
echo "$1" >$2
])
AC_DEFUN([AC_AS_DIRNAME],
[AC_AS_DIRNAME_EXPR([$1]) 2>/dev/null ||
AC_AS_DIRNAME_SED([$1])
])
# _AC_AS_EXPR_PREPARE
# ----------------
# Some expr work properly (i.e. compute and issue the right result),
# but exit with failure. When a fall back to expr (as in AS_DIRNAME)
# is provided, you get twice the result. Prevent this.
AC_DEFUN([_AC_AS_EXPR_PREPARE],
[if expr a : '\(a\)' >/dev/null 2>&1; then
as_expr=expr
else
as_expr=false
fi
])# _AC_AS_EXPR_PREPARE
# AS_DIRNAME(PATHNAME)
# --------------------
# Simulate running `dirname(1)' on PATHNAME, not all systems have it.
# This macro must be usable from inside ` `.
#
# Prefer expr to echo|sed, since expr is usually faster and it handles
# backslashes and newlines correctly. However, older expr
# implementations (e.g. SunOS 4 expr and Solaris 8 /usr/ucb/expr) have
# a silly length limit that causes expr to fail if the matched
# substring is longer than 120 bytes. So fall back on echo|sed if
# expr fails.
#
# FIXME: Please note the following m4_require is quite wrong: if the first
# occurrence of AS_DIRNAME_EXPR is in a backquoted expression, the
# shell will be lost. We might have to introduce diversions for
# setting up an M4sh script: required macros will then be expanded there.
AC_DEFUN([AC_AS_DIRNAME_EXPR],
[AC_REQUIRE([_AC_AS_EXPR_PREPARE])dnl
$as_expr X[]$1 : 'X\(.*[[^/]]\)//*[[^/][^/]]*/*$' \| \
X[]$1 : 'X\(//\)[[^/]]' \| \
X[]$1 : 'X\(//\)$' \| \
X[]$1 : 'X\(/\)' \| \
. : '\(.\)'])
AC_DEFUN([AC_AS_DIRNAME_SED],
[echo X[]$1 |
sed ['/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
/^X\(\/\/\)[^/].*/{ s//\1/; q; }
/^X\(\/\/\)$/{ s//\1/; q; }
/^X\(\/\).*/{ s//\1/; q; }
s/.*/./; q']])
</pre>
</div>
</body>
</html>
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