291 lines
8 KiB
C
291 lines
8 KiB
C
/*
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* FreeBSD install - a package for the installation and maintenance
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* of non-core utilities.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Maxim Sobolev
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* 31 July 2001
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*
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* Written by Oliver Eikemeier
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* Based on work of Jeremy D. Lea.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <ctype.h>
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#include <xbps_api.h>
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/*
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* split_version(pkgname, endname, epoch, revision) returns a pointer to
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* the version portion of a package name and the two special components.
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*
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* Syntax is: ${PKGNAME}-${VERSION}[_${PKGREVISION}][-${EPOCH}]
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*
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*/
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static const char *
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split_version(const char *pkgname, const char **endname, unsigned long *epoch,
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unsigned long *revision)
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{
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char *ch;
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const char *versionstr;
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const char *endversionstr;
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assert(pkgname != NULL);
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/* Look for the last '-' the the pkgname */
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ch = strrchr(pkgname, '-');
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/* Cheat if we are just passed a version, not a valid package name */
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versionstr = ch ? ch + 1 : pkgname;
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/* Look for the last '_' in the version string, advancing the end pointer */
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ch = strrchr(versionstr, '_');
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if (revision != NULL) {
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*revision = ch ? strtoul(ch + 1, NULL, 10) : 0;
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}
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endversionstr = ch;
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/* Look for the last '-' in the remaining version string */
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ch = strrchr(endversionstr ? endversionstr + 1 : versionstr, '-');
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if (epoch != NULL) {
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*epoch = ch ? strtoul(ch + 1, NULL, 10) : 0;
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}
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if (ch && !endversionstr)
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endversionstr = ch;
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/*
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* set the pointer behind the last character of the version without
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* revision or epoch
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*/
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if (endname)
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*endname = endversionstr ? endversionstr : strrchr(versionstr, '\0');
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return versionstr;
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}
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/*
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* VERSIONs are composed of components separated by dots. A component
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* consists of a version number, a letter and a patchlevel number.
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*/
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typedef struct {
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long n;
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long pl;
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int a;
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} version_component;
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/*
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* get_component(position, component) gets the value of the next component
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* (number - letter - number triple) and returns a pointer to the next character
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* after any leading separators
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*
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* - components are separated by dots
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* - characters !~ [a-zA-Z0-9.+*] are treated as separators
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* (1.0:2003.09.16 = 1.0.2003.09.16), this may not be what you expect:
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* 1.0.1:2003.09.16 < 1.0:2003.09.16
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* - consecutive separators are collapsed (10..1 = 10.1)
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* - missing separators are inserted, essentially
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* letter number letter => letter number . letter (10a1b2 = 10a1.b2)
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* - missing components are assumed to be equal to 0 (10 = 10.0 = 10.0.0)
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* - the letter sort order is: [none], a, b, ..., z; numbers without letters
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* sort first (10 < 10a < 10b)
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* - missing version numbers (in components starting with a letter) sort as -1
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* (a < 0, 10.a < 10)
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* - a separator is inserted before the special strings "pl", "alpha", "beta",
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* "pre" and "rc".
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* - "pl" sorts before every other letter, "alpha", "beta", "pre" and "rc"
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* sort as a, b, p and r. (10alpha = 10.a < 10, but 10 < 10a; pl11 < alpha3
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* < 0.1beta2 = 0.1.b2 < 0.1)
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* - other strings use only the first letter for sorting, case is ignored
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* (1.d2 = 1.dev2 = 1.Development2)
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* - The special component `*' is guaranteed to be the smallest possible
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* component (2.* < 2pl1 < 2alpha3 < 2.9f7 < 3.*)
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* - components separated by `+' are handled by version_cmp below
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*/
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static const struct {
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const char *name;
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size_t namelen;
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int value;
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} stage[] = {
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{ "pl", 2, 0 },
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{ "alpha", 5, 'a'-'a'+1 },
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{ "beta", 4, 'b'-'a'+1 },
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{ "pre", 3, 'p'-'a'+1 },
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{ "rc", 2, 'r'-'a'+1 },
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{ NULL, 0, -1 }
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};
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static const char *
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get_component(const char *position, version_component *component)
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{
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const char *pos = position;
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int hasstage = 0, haspatchlevel = 0;
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assert(pos != NULL);
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/* handle version number */
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if (isdigit((unsigned char)*pos)) {
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char *endptr;
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component->n = strtol(pos, &endptr, 10);
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/* should we test for errno == ERANGE? */
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pos = endptr;
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} else if (*pos == '*') {
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component->n = -2;
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do {
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pos++;
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} while(*pos && *pos != '+');
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} else {
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component->n = -1;
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hasstage = 1;
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}
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/* handle letter */
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if (isalpha((unsigned char)*pos)) {
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int c = tolower((unsigned char)*pos);
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haspatchlevel = 1;
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/* handle special suffixes */
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if (isalpha((unsigned char)pos[1])) {
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int i;
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for (i = 0; stage[i].name; i++) {
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if (strncasecmp(pos, stage[i].name, stage[i].namelen) == 0
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&& !isalpha((unsigned char)pos[stage[i].namelen])) {
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if (hasstage) {
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/* stage to value */
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component->a = stage[i].value;
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pos += stage[i].namelen;
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} else {
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/* insert dot */
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component->a = 0;
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haspatchlevel = 0;
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}
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c = 0;
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break;
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}
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}
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}
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/* unhandled above */
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if (c) {
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/* use the first letter and skip following */
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component->a = c - 'a' + 1;
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do {
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++pos;
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} while (isalpha((unsigned char)*pos));
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}
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} else {
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component->a = 0;
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haspatchlevel = 0;
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}
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if (haspatchlevel) {
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/* handle patch number */
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if (isdigit((unsigned char)*pos)) {
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char *endptr;
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component->pl = strtol(pos, &endptr, 10);
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/* should we test for errno == ERANGE? */
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pos = endptr;
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} else {
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component->pl = -1;
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}
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} else {
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component->pl = 0;
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}
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/* skip trailing separators */
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while (*pos && !isdigit((unsigned char)*pos) &&
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!isalpha((unsigned char)*pos) &&
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*pos != '+' && *pos != '*') {
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pos++;
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}
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return pos;
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}
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/*
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* version_cmp(pkg1, pkg2) returns -1, 0 or 1 depending on if the version
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* components of pkg1 is less than, equal to or greater than pkg2. No
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* comparison of the basenames is done.
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*
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* The port version is defined by:
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* ${VERSION}[_${PKGREVISION}][-${EPOCH}]
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* ${EPOCH} supersedes ${VERSION} supersedes ${PKGREVISION}.
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*
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* The epoch and revision are defined to be a single number, while the rest
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* of the version should conform to the porting guidelines. It can contain
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* multiple components, separated by a period, including letters.
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*/
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int
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xbps_cmpver_packages(const char *pkg1, const char *pkg2)
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{
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const char *v1, *v2, *ve1, *ve2;
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unsigned long e1, e2, r1, r2;
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int result = 0;
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v1 = split_version(pkg1, &ve1, &e1, &r1);
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v2 = split_version(pkg2, &ve2, &e2, &r2);
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/* Check epoch, version, and pkgrevision, in that order. */
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if (e1 != e2) {
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result = (e1 < e2 ? -1 : 1);
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}
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/* Shortcut check for equality before invoking the parsing routines. */
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if (result == 0 && (ve1 - v1 != ve2 - v2 ||
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strncasecmp(v1, v2, ve1 - v1) != 0)) {
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/* Loop over different components (the parts separated by dots).
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* If any component differs, we have the basis for an inequality. */
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while(result == 0 && (v1 < ve1 || v2 < ve2)) {
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int block_v1 = 0;
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int block_v2 = 0;
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version_component vc1 = {0, 0, 0};
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version_component vc2 = {0, 0, 0};
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if (v1 < ve1 && *v1 != '+') {
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v1 = get_component(v1, &vc1);
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} else {
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block_v1 = 1;
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}
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if (v2 < ve2 && *v2 != '+') {
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v2 = get_component(v2, &vc2);
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} else {
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block_v2 = 1;
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}
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if (block_v1 && block_v2) {
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if (v1 < ve1)
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v1++;
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if (v2 < ve2)
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v2++;
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} else if (vc1.n != vc2.n) {
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result = (vc1.n < vc2.n ? -1 : 1);
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} else if (vc1.a != vc2.a) {
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result = (vc1.a < vc2.a ? -1 : 1);
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} else if (vc1.pl != vc2.pl) {
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result = (vc1.pl < vc2.pl ? -1 : 1);
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}
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}
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}
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/* Compare revision numbers. */
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if (result == 0 && r1 != r2) {
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result = (r1 < r2 ? -1 : 1);
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}
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return result;
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}
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int
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xbps_cmpver_versions(const char *inst, const char *req)
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{
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int res = xbps_cmpver_packages(inst, req);
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return res;
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}
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