104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/** \ingroup rpmtrans
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* \file lib/rpmvercmp.c
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*/
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#include "system.h"
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#include <rpmlib.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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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 (!strcmp(a, b)) return 0;
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str1 = alloca(strlen(a) + 1);
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str2 = 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 && !xisalnum(*one)) one++;
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while (*two && !xisalnum(*two)) two++;
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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 (xisdigit(*str1)) {
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while (*str1 && xisdigit(*str1)) str1++;
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while (*str2 && xisdigit(*str2)) str2++;
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isnum = 1;
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} else {
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while (*str1 && xisalpha(*str1)) str1++;
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while (*str2 && xisalpha(*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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/* 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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if (one == str1) return -1; /* arbitrary */
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if (two == str2) return -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;
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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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