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https://git.code.sf.net/p/quake/newtree
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104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/*
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ver_check.c
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Version number comparisons
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Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.uk>
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Copyright (C) 2000 Jeff Teunissen <deek@dusknet.dhs.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include <ctype.h>
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/*
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ver_compare
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Compare two ASCII version strings. If the first is greater than the second,
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return a positive number. If the second is greater, return a negative. If
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they are equal, return zero.
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*/
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int
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ver_compare (const char *value, const char *reference)
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{
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const char *valptr, *refptr;
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int vc, rc;
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long vl, rl;
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if (!value)
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value = "";
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if (!reference)
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reference = "";
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for (;;) {
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valptr = value;
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while (*valptr && !isdigit ((int) *valptr)) // Scan past any non-digits
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valptr++;
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refptr = reference;
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while (*refptr && !isdigit ((int) *refptr)) // get past non-digits
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refptr++;
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for (;;) {
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vc = (value == valptr) ? 0 : *value++;
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rc = (reference == refptr) ? 0 : *reference++;
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if ((!vc) && (!rc))
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break;
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if (vc && !isalpha (vc))
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vc += 256; // ASCII charset
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if (rc && !isalpha (rc))
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rc += 256;
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if (vc != rc)
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return (vc - rc);
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}
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value = valptr;
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reference = refptr;
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vl = rl = 0;
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if (isdigit ((int) *valptr))
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vl = strtol (value, (char **) &value, 10);
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if (isdigit ((int) *refptr))
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rl = strtol (reference, (char **) &reference, 10);
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if (vl != rl)
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return (vl - rl);
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if ((!*value) && (!*reference))
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return 0;
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if (!*value)
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return -1;
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if (!*reference)
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return 1;
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}
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}
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