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/* version.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <ctype.h>
#include "apk_defines.h"
#include "apk_version.h"
/* Gentoo version: {digit}{.digit}...{letter}{_suf{#}}...{-r#} */
enum PARTS {
TOKEN_INVALID = -1,
TOKEN_DIGIT_OR_ZERO,
TOKEN_DIGIT,
TOKEN_LETTER,
TOKEN_SUFFIX,
TOKEN_SUFFIX_NO,
TOKEN_REVISION_NO,
TOKEN_END,
};
static void next_token(int *type, apk_blob_t *blob)
{
int n = TOKEN_INVALID;
if (blob->len == 0 || blob->ptr[0] == 0) {
n = TOKEN_END;
} else if (islower(blob->ptr[0])) {
n = TOKEN_LETTER;
} else if (*type == TOKEN_SUFFIX && isdigit(blob->ptr[0])) {
n = TOKEN_SUFFIX_NO;
} else {
switch (blob->ptr[0]) {
case '.':
n = TOKEN_DIGIT_OR_ZERO;
break;
case '_':
n = TOKEN_SUFFIX;
break;
case '-':
if (blob->len > 1 && blob->ptr[1] == 'r') {
n = TOKEN_REVISION_NO;
blob->ptr++;
blob->len--;
} else
n = TOKEN_INVALID;
break;
}
blob->ptr++;
blob->len--;
}
if (n < *type) {
if (! ((n == TOKEN_DIGIT_OR_ZERO && *type == TOKEN_DIGIT) ||
(n == TOKEN_SUFFIX && *type == TOKEN_SUFFIX_NO)))
n = TOKEN_INVALID;
}
*type = n;
}
static int get_token(int *type, apk_blob_t *blob)
{
static const char *pre_suffixes[] = { "alpha", "beta", "pre", "rc" };
int v = 0, i = 0, nt = TOKEN_INVALID;
switch (*type) {
case TOKEN_DIGIT_OR_ZERO:
/* Leading zero digits get a special treatment */
if (blob->ptr[i] == '0') {
while (blob->ptr[i] == '0' && i < blob->len)
i++;
nt = TOKEN_DIGIT;
v = -i;
break;
}
case TOKEN_DIGIT:
case TOKEN_SUFFIX_NO:
case TOKEN_REVISION_NO:
while (isdigit(blob->ptr[i]) && i < blob->len) {
v *= 10;
v += blob->ptr[i++] - '0';
}
break;
case TOKEN_LETTER:
v = blob->ptr[i++];
break;
case TOKEN_SUFFIX:
for (v = 0; v < ARRAY_SIZE(pre_suffixes); v++) {
i = strlen(pre_suffixes[v]);
if (i < blob->len &&
strncmp(pre_suffixes[v], blob->ptr, i) == 0)
break;
}
if (v < ARRAY_SIZE(pre_suffixes)) {
nt = TOKEN_SUFFIX_NO;
v = v - ARRAY_SIZE(pre_suffixes);
break;
}
if (strncmp("p", blob->ptr, 1) == 0) {
nt = TOKEN_SUFFIX_NO;
v = 1;
break;
}
/* fallthrough: invalid suffix */
default:
*type = TOKEN_INVALID;
return -1;
}
blob->ptr += i;
blob->len -= i;
if (nt != TOKEN_INVALID)
*type = nt;
else
next_token(type, blob);
return v;
}
int apk_version_validate(apk_blob_t ver)
{
int t = TOKEN_DIGIT;
while (t != TOKEN_END && t != TOKEN_INVALID)
get_token(&t, &ver);
return t == TOKEN_END;
}
int apk_version_compare(apk_blob_t a, apk_blob_t b)
{
int at = TOKEN_DIGIT, bt = TOKEN_DIGIT;
int av = 0, bv = 0;
while (at == bt && at != TOKEN_END && av == bv) {
av = get_token(&at, &a);
bv = get_token(&bt, &b);
#if 0
fprintf(stderr,
"av=%d, at=%d, a.len=%d\n"
"bv=%d, bt=%d, b.len=%d\n",
av, at, a.len, bv, bt, b.len);
#endif
}
/* value of this token differs? */
if (av < bv)
return APK_VERSION_LESS;
if (av > bv)
return APK_VERSION_GREATER;
if (at < bt)
return get_token(&at, &a) < 0 ?
APK_VERSION_LESS : APK_VERSION_GREATER;
if (bt < at)
return get_token(&bt, &b) > 0 ?
APK_VERSION_LESS : APK_VERSION_GREATER;
return APK_VERSION_EQUAL;
}
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