diff options
Diffstat (limited to 'lib/libalpm')
| -rw-r--r-- | lib/libalpm/version.c | 157 |
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: */ |