summaryrefslogtreecommitdiff
path: root/lib/libalpm/versioncmp.c
blob: 36ce8f2ad5a754b5747a85323ec4957873a3749d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/*
 *  versioncmp.c
 * 
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 * 
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <string.h>
/* pacman */
#include "versioncmp.h"

#ifndef HAVE_STRVERSCMP
/* GNU's strverscmp() function, taken from glibc 2.3.2 sources
 */

/* Compare strings while treating digits characters numerically.
   Copyright (C) 1997, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
           fractionnal parts, S_Z: idem but with leading Zeroes only */
#define  S_N    0x0
#define  S_I    0x4
#define  S_F    0x8
#define  S_Z    0xC

/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
#define  CMP    2
#define  LEN    3

/* Compare S1 and S2 as strings holding indices/version numbers,
   returning less than, equal to or greater than zero if S1 is less than,
   equal to or greater than S2 (for more info, see the texinfo doc).
*/

static int strverscmp (s1, s2)
     const char *s1;
     const char *s2;
{
  const unsigned char *p1 = (const unsigned char *) s1;
  const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;
  int state;
  int diff;

  /* Symbol(s)    0       [1-9]   others  (padding)
     Transition   (10) 0  (01) d  (00) x  (11) -   */
  static const unsigned int next_state[] =
  {
      /* state    x    d    0    - */
      /* S_N */  S_N, S_I, S_Z, S_N,
      /* S_I */  S_N, S_I, S_I, S_I,
      /* S_F */  S_N, S_F, S_F, S_F,
      /* S_Z */  S_N, S_F, S_Z, S_Z
  };

  static const int result_type[] =
  {
      /* state   x/x  x/d  x/0  x/-  d/x  d/d  d/0  d/-
                 0/x  0/d  0/0  0/-  -/x  -/d  -/0  -/- */

      /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_I */  CMP, -1,  -1,  CMP, +1,  LEN, LEN, CMP,
                 +1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
      /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_Z */  CMP, +1,  +1,  CMP, -1,  CMP, CMP, CMP,
                 -1,  CMP, CMP, CMP
  };

  if (p1 == p2)
    return 0;

  c1 = *p1++;
  c2 = *p2++;
  /* Hint: '0' is a digit too.  */
  state = S_N | ((c1 == '0') + (isdigit (c1) != 0));

  while ((diff = c1 - c2) == 0 && c1 != '\0')
    {
      state = next_state[state];
      c1 = *p1++;
      c2 = *p2++;
      state |= (c1 == '0') + (isdigit (c1) != 0);
    }

  state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))];

  switch (state)
  {
    case CMP:
      return diff;

    case LEN:
      while (isdigit (*p1++))
	if (!isdigit (*p2++))
	  return 1;

      return isdigit (*p2) ? -1 : diff;

    default:
      return state;
  }
}

#endif

/* this function was taken from rpm 4.0.4 and rewritten */
int versioncmp(const char *a, const char *b) {
	char *str1, *ostr1, *str2, *ostr2;
	char *one, *two;
	char *rel1 = NULL, *rel2 = NULL;
	char oldch1, oldch2;
	int is1num, is2num;
	int rc, rv;
	
	if (!strcmp(a,b)) {
		return(0);
	}

	str1 = strdup(a);
	ostr1 = str1;
	str2 = strdup(b);
	ostr2 = str2;

	/* lose the release number */
	for(one = str1; *one && *one != '-'; one++);
	if(*one) {
		*one = '\0';
		rel1 = ++one;
		if (*rel1 == '\0')
			rel1 = NULL;
	}
	for(two = str2; *two && *two != '-'; two++);
	if(*two) {
		*two = '\0';
		rel2 = ++two;
		if (*rel2 == '\0')
			rel2 = NULL;
	}

	one = str1;
	two = str2;

	while(*one || *two) {
		while(*one && !isalnum(*one)) one++;
		while(*two && !isalnum(*two)) two++;

		str1 = one;
		str2 = two;

		/* find the next segment for each string */
		if(isdigit(*str1)) {
			is1num = 1;
			while(*str1 && isdigit(*str1)) str1++;
		} else {
			is1num = 0;
			while(*str1 && isalpha(*str1)) str1++;
		}
		if(isdigit(*str2)) {
			is2num = 1;
			while(*str2 && isdigit(*str2)) str2++;
		} else {
			is2num = 0;
			while(*str2 && isalpha(*str2)) str2++;
		}

		oldch1 = *str1;
		*str1 = '\0';
		oldch2 = *str2;
		*str2 = '\0';

		/* see if we ran out of segments on one string */
		if(one == str1 && two != str2) {
			free(ostr1);
			free(ostr2);
			return(is2num ? -1 : 1);
		}
		if(one != str1 && two == str2) {
			free(ostr1);
			free(ostr2);
			return(is1num ? 1 : -1);
		}

		/* see if we have a type mismatch (ie, one is alpha and one is digits) */
		if(is1num && !is2num) {
			free(ostr1);
			free(ostr2);
			return(1);
		}
		if(!is1num && is2num) { 
			free(ostr1);
			free(ostr2);
			return(-1);
		}

		if(is1num) while(*one == '0') one++;
		if(is2num) while(*two == '0') two++;

		rc = strverscmp(one, two);
		if(rc) { 
			free(ostr1);
			free(ostr2);
			return(rc);
		}

		*str1 = oldch1;
		*str2 = oldch2;
		one = str1;
		two = str2;
	}

	if((!*one) && (!*two)) {
		/* compare release numbers */
		if(rel1 && rel2) {
			rv = versioncmp(rel1, rel2);
			free(ostr1);
			free(ostr2);
			return rv;
		} else {
			free(ostr1);
			free(ostr2);
			return(0);
		}
	}

	return(*one ? 1 : -1);
}

/* vim: set ts=2 sw=2 noet: */