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-rw-r--r--lib/libalpm/version.c157
1 files changed, 117 insertions, 40 deletions
diff --git a/lib/libalpm/version.c b/lib/libalpm/version.c
index 85cc2f57..eba66210 100644
--- a/lib/libalpm/version.c
+++ b/lib/libalpm/version.c
@@ -23,23 +23,66 @@
/* libalpm */
#include "util.h"
-/** Compare two version strings and determine which one is 'newer'.
- * Returns a value comparable to the way strcmp works. Returns 1
- * if a is newer than b, 0 if a and b are the same version, or -1
- * if b is newer than a.
- *
- * This function has been adopted from the rpmvercmp function located
- * at lib/rpmvercmp.c, and was most recently updated against rpm
- * version 4.4.2.3. Small modifications have been made to make it more
- * consistent with the libalpm coding style.
- *
- * Keep in mind that the pkgrel is only compared if it is available
- * on both versions handed to this function. For example, comparing
- * 1.5-1 and 1.5 will yield 0; comparing 1.5-1 and 1.5-2 will yield
- * -1 as expected. This is mainly for supporting versioned dependencies
- * that do not include the pkgrel.
+/**
+ * Some functions in this file have been adopted from the rpm source, notably
+ * 'rpmvercmp' located at lib/rpmvercmp.c and 'parseEVR' located at
+ * lib/rpmds.c. It was most recently updated against rpm version 4.8.1. Small
+ * modifications have been made to make it more consistent with the libalpm
+ * coding style.
*/
-int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
+
+/**
+ * Split EVR into epoch, version, and release components.
+ * @param evr [epoch:]version[-release] string
+ * @retval *ep pointer to epoch
+ * @retval *vp pointer to version
+ * @retval *rp pointer to release
+ */
+static void parseEVR(char *evr, const char **ep, const char **vp,
+ const char **rp)
+{
+ const char *epoch;
+ const char *version;
+ const char *release;
+ char *s, *se;
+
+ s = evr;
+ /* s points to epoch terminator */
+ while (*s && isdigit(*s)) s++;
+ /* se points to version terminator */
+ se = strrchr(s, '-');
+
+ if(*s == ':') {
+ epoch = evr;
+ *s++ = '\0';
+ version = s;
+ if(*epoch == '\0') {
+ epoch = "0";
+ }
+ } else {
+ /* different from RPM- always assume 0 epoch */
+ epoch = "0";
+ version = evr;
+ }
+ if(se) {
+ *se++ = '\0';
+ release = se;
+ } else {
+ release = NULL;
+ }
+
+ if(ep) *ep = epoch;
+ if(vp) *vp = version;
+ if(rp) *rp = release;
+}
+
+/**
+ * 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
+ */
+static int rpmvercmp(const char *a, const char *b)
{
char oldch1, oldch2;
char *str1, *str2;
@@ -49,13 +92,6 @@ int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
int isnum;
int ret = 0;
- /* libalpm added code. ensure our strings are not null */
- if(!a) {
- if(!b) return(0);
- return(-1);
- }
- if(!b) return(1);
-
/* easy comparison to see if versions are identical */
if(strcmp(a, b) == 0) return(0);
@@ -147,22 +183,6 @@ int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
one = ptr1;
*ptr2 = oldch2;
two = ptr2;
-
- /* libalpm added code. check if version strings have hit the pkgrel
- * portion. depending on which strings have hit, take correct action.
- * this is all based on the premise that we only have one dash in
- * the version string, and it separates pkgver from pkgrel. */
- if(*ptr1 == '-' && *ptr2 == '-') {
- /* no-op, continue comparing since we are equivalent throughout */
- } else if(*ptr1 == '-') {
- /* ptr1 has hit the pkgrel and ptr2 has not. continue version
- * comparison after stripping the pkgrel from ptr1. */
- *ptr1 = '\0';
- } else if(*ptr2 == '-') {
- /* ptr2 has hit the pkgrel and ptr1 has not. continue version
- * comparison after stripping the pkgrel from ptr2. */
- *ptr2 = '\0';
- }
}
/* this catches the case where all numeric and alpha segments have */
@@ -179,7 +199,7 @@ int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
* - if one is an alpha, two is newer.
* - otherwise one is newer.
* */
- if ( ( !*one && !isalpha((int)*two) )
+ if ( (!*one && !isalpha((int)*two))
|| isalpha((int)*one) ) {
ret = -1;
} else {
@@ -192,4 +212,61 @@ cleanup:
return(ret);
}
+/** Compare two version strings and determine which one is 'newer'.
+ * Returns a value comparable to the way strcmp works. Returns 1
+ * if a is newer than b, 0 if a and b are the same version, or -1
+ * if b is newer than a.
+ *
+ * Different epoch values for version strings will override any further
+ * comparison. If no epoch is provided, 0 is assumed.
+ *
+ * Keep in mind that the pkgrel is only compared if it is available
+ * on both versions handed to this function. For example, comparing
+ * 1.5-1 and 1.5 will yield 0; comparing 1.5-1 and 1.5-2 will yield
+ * -1 as expected. This is mainly for supporting versioned dependencies
+ * that do not include the pkgrel.
+ */
+int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
+{
+ char *full1, *full2;
+ const char *epoch1, *ver1, *rel1;
+ const char *epoch2, *ver2, *rel2;
+ int ret;
+
+ /* ensure our strings are not null */
+ if(!a && !b) {
+ return(0);
+ } else if(!a) {
+ return(-1);
+ } else if(!b) {
+ return(1);
+ }
+ /* another quick shortcut- if full version specs are equal */
+ if(strcmp(a, b) == 0) {
+ return(0);
+ }
+
+ /* Parse both versions into [epoch:]version[-release] triplets. We probably
+ * don't need epoch and release to support all the same magic, but it is
+ * easier to just run it all through the same code. */
+ full1 = strdup(a);
+ full2 = strdup(b);
+
+ /* parseEVR modifies passed in version, so have to dupe it first */
+ parseEVR(full1, &epoch1, &ver1, &rel1);
+ parseEVR(full2, &epoch2, &ver2, &rel2);
+
+ ret = rpmvercmp(epoch1, epoch2);
+ if(ret == 0) {
+ ret = rpmvercmp(ver1, ver2);
+ if(ret == 0 && rel1 && rel2) {
+ ret = rpmvercmp(rel1, rel2);
+ }
+ }
+
+ free(full1);
+ free(full2);
+ return(ret);
+}
+
/* vim: set ts=2 sw=2 noet: */