diff options
Diffstat (limited to 'lib/rpmvercmp.c')
| -rw-r--r-- | lib/rpmvercmp.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lib/rpmvercmp.c b/lib/rpmvercmp.c new file mode 100644 index 0000000..f5ae092 --- /dev/null +++ b/lib/rpmvercmp.c @@ -0,0 +1,131 @@ +/** \ingroup rpmts + * \file lib/rpmvercmp.c + */ + +#include "system.h" + +#include <rpm/rpmlib.h> /* rpmvercmp proto */ +#include <rpm/rpmstring.h> + +#include "debug.h" + +/* compare alpha and numeric segments of two versions */ +/* return 1: a is newer than b */ +/* 0: a and b are the same version */ +/* -1: b is newer than a */ +int rpmvercmp(const char * a, const char * b) +{ + char oldch1, oldch2; + char abuf[strlen(a)+1], bbuf[strlen(b)+1]; + char *str1 = abuf, *str2 = bbuf; + char * one, * two; + int rc; + int isnum; + + /* easy comparison to see if versions are identical */ + if (rstreq(a, b)) return 0; + + strcpy(str1, a); + strcpy(str2, b); + + one = str1; + two = str2; + + /* loop through each version segment of str1 and str2 and compare them */ + while (*one && *two) { + while (*one && !risalnum(*one)) one++; + while (*two && !risalnum(*two)) two++; + + /* If we ran to the end of either, we are finished with the loop */ + if (!(*one && *two)) break; + + str1 = one; + str2 = two; + + /* grab first completely alpha or completely numeric segment */ + /* leave one and two pointing to the start of the alpha or numeric */ + /* segment and walk str1 and str2 to end of segment */ + if (risdigit(*str1)) { + while (*str1 && risdigit(*str1)) str1++; + while (*str2 && risdigit(*str2)) str2++; + isnum = 1; + } else { + while (*str1 && risalpha(*str1)) str1++; + while (*str2 && risalpha(*str2)) str2++; + isnum = 0; + } + + /* save character at the end of the alpha or numeric segment */ + /* so that they can be restored after the comparison */ + oldch1 = *str1; + *str1 = '\0'; + oldch2 = *str2; + *str2 = '\0'; + + /* this cannot happen, as we previously tested to make sure that */ + /* the first string has a non-null segment */ + if (one == str1) return -1; /* arbitrary */ + + /* take care of the case where the two version segments are */ + /* different types: one numeric, the other alpha (i.e. empty) */ + /* numeric segments are always newer than alpha segments */ + /* XXX See patch #60884 (and details) from bugzilla #50977. */ + if (two == str2) return (isnum ? 1 : -1); + + if (isnum) { + /* this used to be done by converting the digit segments */ + /* to ints using atoi() - it's changed because long */ + /* digit segments can overflow an int - this should fix that. */ + + /* throw away any leading zeros - it's a number, right? */ + while (*one == '0') one++; + while (*two == '0') two++; + + /* whichever number has more digits wins */ + if (strlen(one) > strlen(two)) return 1; + if (strlen(two) > strlen(one)) return -1; + } + + /* strcmp will return which one is greater - even if the two */ + /* segments are alpha or if they are numeric. don't return */ + /* if they are equal because there might be more segments to */ + /* compare */ + rc = strcmp(one, two); + if (rc) return (rc < 1 ? -1 : 1); + + /* restore character that was replaced by null above */ + *str1 = oldch1; + one = str1; + *str2 = oldch2; + two = str2; + } + + /* this catches the case where all numeric and alpha segments have */ + /* compared identically but the segment sepparating characters were */ + /* different */ + if ((!*one) && (!*two)) return 0; + + /* whichever version still has characters left over wins */ + if (!*one) return -1; else return 1; +} + +int rpmVersionCompare(Header first, Header second) +{ + /* Missing epoch becomes zero here, which is what we want */ + uint32_t epochOne = headerGetNumber(first, RPMTAG_EPOCH); + uint32_t epochTwo = headerGetNumber(second, RPMTAG_EPOCH); + int rc; + + if (epochOne < epochTwo) + return -1; + else if (epochOne > epochTwo) + return 1; + + rc = rpmvercmp(headerGetString(first, RPMTAG_VERSION), + headerGetString(second, RPMTAG_VERSION)); + if (rc) + return rc; + + return rpmvercmp(headerGetString(first, RPMTAG_RELEASE), + headerGetString(second, RPMTAG_RELEASE)); +} |