6c648dd642
This is actually a fully functional build except: * All internal shared libraries are static linked to make sure there is no interference with ports (and to reduce build time). * It does not have the python/perl/etc plugin or API support. * By default, it installs as "svnlite" rather than "svn". * If WITH_SVN added in make.conf, you get "svn". * If WITHOUT_SVNLITE is in make.conf, this is completely disabled. To be absolutely clear, this is not intended for any use other than checking out freebsd source and committing, like we once did with cvs. It should be usable for small scale local repositories that don't need the python/perl plugin architecture.
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/* -*- mode: c; c-file-style: "k&r" -*-
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strnatcmp.c -- Perform 'natural order' comparisons of strings in C.
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Copyright (C) 2000 by Martin Pool <mbp@humbug.org.au>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include <ctype.h>
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#include <string.h>
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#include "apr_strings.h"
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#include "apr_lib.h" /* for apr_is*() */
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#if defined(__GNUC__)
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# define UNUSED __attribute__((__unused__))
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#else
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# define UNUSED
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#endif
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/* based on "strnatcmp.c,v 1.6 2000/04/20 07:30:11 mbp Exp $" */
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static int
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compare_right(char const *a, char const *b)
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{
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int bias = 0;
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/* The longest run of digits wins. That aside, the greatest
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value wins, but we can't know that it will until we've scanned
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both numbers to know that they have the same magnitude, so we
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remember it in BIAS. */
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for (;; a++, b++) {
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if (!apr_isdigit(*a) && !apr_isdigit(*b))
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break;
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else if (!apr_isdigit(*a))
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return -1;
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else if (!apr_isdigit(*b))
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return +1;
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else if (*a < *b) {
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if (!bias)
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bias = -1;
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} else if (*a > *b) {
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if (!bias)
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bias = +1;
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} else if (!*a && !*b)
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break;
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}
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return bias;
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}
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static int
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compare_left(char const *a, char const *b)
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{
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/* Compare two left-aligned numbers: the first to have a
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different value wins. */
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for (;; a++, b++) {
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if (!apr_isdigit(*a) && !apr_isdigit(*b))
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break;
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else if (!apr_isdigit(*a))
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return -1;
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else if (!apr_isdigit(*b))
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return +1;
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else if (*a < *b)
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return -1;
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else if (*a > *b)
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return +1;
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}
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return 0;
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}
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static int strnatcmp0(char const *a, char const *b, int fold_case)
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{
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int ai, bi;
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char ca, cb;
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int fractional, result;
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ai = bi = 0;
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while (1) {
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ca = a[ai]; cb = b[bi];
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/* skip over leading spaces or zeros */
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while (apr_isspace(ca))
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ca = a[++ai];
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while (apr_isspace(cb))
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cb = b[++bi];
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/* process run of digits */
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if (apr_isdigit(ca) && apr_isdigit(cb)) {
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fractional = (ca == '0' || cb == '0');
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if (fractional) {
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if ((result = compare_left(a+ai, b+bi)) != 0)
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return result;
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} else {
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if ((result = compare_right(a+ai, b+bi)) != 0)
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return result;
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}
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}
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if (!ca && !cb) {
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/* The strings compare the same. Perhaps the caller
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will want to call strcmp to break the tie. */
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return 0;
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}
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if (fold_case) {
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ca = apr_toupper(ca);
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cb = apr_toupper(cb);
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}
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if (ca < cb)
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return -1;
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else if (ca > cb)
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return +1;
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++ai; ++bi;
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}
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}
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APR_DECLARE(int) apr_strnatcmp(char const *a, char const *b)
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{
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return strnatcmp0(a, b, 0);
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}
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/* Compare, recognizing numeric string and ignoring case. */
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APR_DECLARE(int) apr_strnatcasecmp(char const *a, char const *b)
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{
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return strnatcmp0(a, b, 1);
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}
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