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1085ba7377
Upstream rpm has some convenience inline functions for strcmp and the character class functions. Define some macros here to make our code look more like upstream despite being the same functionally. One difference noted while investigating the inline functions in upstream is that the rpm character class functions are slightly different from the standard functions. The rpm functions are independent of locale, unlike the libc routines. pkg-config should probably do the same and could easily use the g_ascii_is* macros from glib.
131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/*
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* This code is taken from the RPM package manager.
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*
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* RPM is Copyright (c) 1998 by Red Hat Software, Inc.,
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* and may be distributed under the terms of the GPL and LGPL.
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* See http://rpm.org/gitweb?p=rpm.git;a=blob_plain;f=COPYING;hb=HEAD
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*
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* The code should follow upstream as closely as possible.
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* See http://rpm.org/gitweb?p=rpm.git;a=blob_plain;f=lib/rpmvercmp.c;hb=HEAD
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*
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* Currently the only difference as a policy is that upstream uses C99
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* features and pkg-config does not require a C99 compiler yet.
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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 "rpmvercmp.h"
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#include <glib.h>
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#include <string.h>
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#include <ctype.h>
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/* macros to help code look more like upstream */
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#define rstreq(a, b) (strcmp(a, b) == 0)
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#define risalnum(c) isalnum((guchar)(c))
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#define risdigit(c) isdigit((guchar)(c))
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#define risalpha(c) isalpha((guchar)(c))
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/* compare alpha and numeric segments of two versions */
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/* return 1: a is newer than b */
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/* 0: a and b are the same version */
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/* -1: b is newer than a */
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int rpmvercmp(const char * a, const char * b)
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{
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char oldch1, oldch2;
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char * str1, * str2;
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char * one, * two;
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int rc;
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int isnum;
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/* easy comparison to see if versions are identical */
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if (rstreq(a, b)) return 0;
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str1 = g_alloca(strlen(a) + 1);
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str2 = g_alloca(strlen(b) + 1);
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strcpy(str1, a);
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strcpy(str2, b);
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one = str1;
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two = str2;
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/* loop through each version segment of str1 and str2 and compare them */
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while (*one && *two) {
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while (*one && !risalnum(*one)) one++;
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while (*two && !risalnum(*two)) two++;
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/* If we ran to the end of either, we are finished with the loop */
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if (!(*one && *two)) break;
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str1 = one;
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str2 = two;
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/* grab first completely alpha or completely numeric segment */
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/* leave one and two pointing to the start of the alpha or numeric */
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/* segment and walk str1 and str2 to end of segment */
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if (risdigit(*str1)) {
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while (*str1 && risdigit(*str1)) str1++;
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while (*str2 && risdigit(*str2)) str2++;
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isnum = 1;
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} else {
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while (*str1 && risalpha(*str1)) str1++;
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while (*str2 && risalpha(*str2)) str2++;
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isnum = 0;
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}
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/* save character at the end of the alpha or numeric segment */
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/* so that they can be restored after the comparison */
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oldch1 = *str1;
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*str1 = '\0';
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oldch2 = *str2;
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*str2 = '\0';
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/* this cannot happen, as we previously tested to make sure that */
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/* the first string has a non-null segment */
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if (one == str1) return -1; /* arbitrary */
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/* take care of the case where the two version segments are */
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/* different types: one numeric, the other alpha (i.e. empty) */
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/* numeric segments are always newer than alpha segments */
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/* XXX See patch #60884 (and details) from bugzilla #50977. */
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if (two == str2) return (isnum ? 1 : -1);
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if (isnum) {
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/* this used to be done by converting the digit segments */
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/* to ints using atoi() - it's changed because long */
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/* digit segments can overflow an int - this should fix that. */
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/* throw away any leading zeros - it's a number, right? */
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while (*one == '0') one++;
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while (*two == '0') two++;
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/* whichever number has more digits wins */
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if (strlen(one) > strlen(two)) return 1;
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if (strlen(two) > strlen(one)) return -1;
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}
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/* strcmp will return which one is greater - even if the two */
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/* segments are alpha or if they are numeric. don't return */
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/* if they are equal because there might be more segments to */
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/* compare */
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rc = strcmp(one, two);
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if (rc) return (rc < 1 ? -1 : 1);
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/* restore character that was replaced by null above */
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*str1 = oldch1;
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one = str1;
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*str2 = oldch2;
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two = str2;
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}
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/* this catches the case where all numeric and alpha segments have */
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/* compared identically but the segment sepparating characters were */
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/* different */
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if ((!*one) && (!*two)) return 0;
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/* whichever version still has characters left over wins */
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if (!*one) return -1; else return 1;
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}
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