139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/** \ingroup rpmts
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* \file lib/rpmvercmp.c
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*/
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#include "system.h"
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#include <rpm/rpmlib.h> /* rpmvercmp proto */
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#include <rpm/rpmstring.h>
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#include "debug.h"
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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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/* easy comparison to see if versions are identical */
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if (rstreq(a, b)) return 0;
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char oldch1, oldch2;
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char abuf[strlen(a)+1], bbuf[strlen(b)+1];
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char *str1 = abuf, *str2 = bbuf;
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char * one, * two;
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int rc;
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int isnum;
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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 != '~' && *one != '^') one++;
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while (*two && !risalnum(*two) && *two != '~' && *two != '^') two++;
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/* handle the tilde separator, it sorts before everything else */
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if (*one == '~' || *two == '~') {
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if (*one != '~') return 1;
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if (*two != '~') return -1;
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one++;
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two++;
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continue;
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}
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/*
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* Handle caret separator. Concept is the same as tilde,
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* except that if one of the strings ends (base version),
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* the other is considered as higher version.
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*/
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if (*one == '^' || *two == '^') {
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if (!*one) return -1;
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if (!*two) return 1;
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if (*one != '^') return 1;
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if (*two != '^') return -1;
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one++;
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two++;
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continue;
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}
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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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size_t onelen, twolen;
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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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onelen = strlen(one);
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twolen = strlen(two);
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if (onelen > twolen) return 1;
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if (twolen > onelen) 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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