rcsnum.c revision 1.9 
1/*	$OpenBSD: rcsnum.c,v 1.9 2005/03/05 05:58:39 jfb Exp $	*/
2/*
3 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28
29#include <ctype.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33
34#include "rcs.h"
35#include "log.h"
36
37
38
39/*
40 * rcsnum_alloc()
41 *
42 * Allocate an RCS number structure.
43 */
44RCSNUM*
45rcsnum_alloc(void)
46{
47	RCSNUM *rnp;
48
49	rnp = (RCSNUM *)malloc(sizeof(*rnp));
50	if (rnp == NULL) {
51		cvs_log(LP_ERR, "failed to allocate RCS number");
52		return (NULL);
53	}
54	rnp->rn_len = 0;
55	rnp->rn_id = NULL;
56
57	return (rnp);
58}
59
60
61/*
62 * rcsnum_parse()
63 *
64 * Parse a string specifying an RCS number and return the corresponding RCSNUM.
65 */
66RCSNUM*
67rcsnum_parse(const char *str)
68{
69	char *ep;
70	RCSNUM *num;
71
72	if ((num = rcsnum_alloc()) == NULL)
73		return (NULL);
74
75	if ((rcsnum_aton(str, &ep, num) < 0) || (*ep != '\0')) {
76		rcsnum_free(num);
77		num = NULL;
78		if (*ep != '\0')
79			rcs_errno = RCS_ERR_BADNUM;
80	}
81
82	return (num);
83}
84
85
86/*
87 * rcsnum_free()
88 *
89 * Free an RCSNUM structure previously allocated with rcsnum_alloc().
90 */
91void
92rcsnum_free(RCSNUM *rn)
93{
94	if (rn->rn_id != NULL)
95		free(rn->rn_id);
96	free(rn);
97}
98
99
100/*
101 * rcsnum_tostr()
102 * Returns a pointer to the start of <buf> on success, or NULL on failure.
103 */
104char*
105rcsnum_tostr(const RCSNUM *nump, char *buf, size_t blen)
106{
107	u_int i;
108	char tmp[8];
109
110	if (nump->rn_len == 0) {
111		buf[0] = '\0';
112		return (buf);
113	}
114
115	snprintf(buf, blen, "%u", nump->rn_id[0]);
116	for (i = 1; i < nump->rn_len; i++) {
117		snprintf(tmp, sizeof(tmp), ".%u", nump->rn_id[i]);
118		strlcat(buf, tmp, blen);
119	}
120
121	return (buf);
122}
123
124
125/*
126 * rcsnum_cpy()
127 *
128 * Copy the number stored in <nsrc> in the destination <ndst> up to <depth>
129 * numbers deep.
130 * Returns 0 on success, or -1 on failure.
131 */
132int
133rcsnum_cpy(const RCSNUM *nsrc, RCSNUM *ndst, u_int depth)
134{
135	u_int len;
136	size_t sz;
137	void *tmp;
138
139	len = nsrc->rn_len;
140	if ((depth != 0) && (len > depth))
141		len = depth;
142	sz = len * sizeof(u_int16_t);
143
144	tmp = realloc(ndst->rn_id, sz);
145	if (tmp == NULL) {
146		cvs_log(LP_ERR, "failed to reallocate RCSNUM");
147		return (-1);
148	}
149
150	ndst->rn_id = (u_int16_t *)tmp;
151	ndst->rn_len = len;
152	memcpy(ndst->rn_id, nsrc->rn_id, sz);
153	return (0);
154}
155
156
157/*
158 * rcsnum_cmp()
159 *
160 * Compare the two numbers <n1> and <n2>. Returns -1 if <n1> is larger than
161 * <n2>, 0 if they are both the same, and 1 if <n2> is larger than <n1>.
162 * The <depth> argument specifies how many numbers deep should be checked for
163 * the result.  A value of 0 means that the depth will be the minimum of the
164 * two numbers.
165 */
166int
167rcsnum_cmp(const RCSNUM *n1, const RCSNUM *n2, u_int depth)
168{
169	int res;
170	u_int i;
171	size_t slen;
172
173	slen = MIN(n1->rn_len, n2->rn_len);
174	if ((depth != 0) && (slen > depth))
175		slen = depth;
176
177	for (i = 0; i < slen; i++) {
178		res = n1->rn_id[i] - n2->rn_id[i];
179		if (res < 0)
180			return (1);
181		else if (res > 0)
182			return (-1);
183	}
184
185	if (n1->rn_len > n2->rn_len)
186		return (-1);
187	else if (n2->rn_len > n1->rn_len)
188		return (1);
189
190	return (0);
191}
192
193
194/*
195 * rcsnum_aton()
196 *
197 * Translate the string <str> containing a sequence of digits and periods into
198 * its binary representation, which is stored in <nump>.  The address of the
199 * first byte not part of the number is stored in <ep> on return, if it is not
200 * NULL.
201 * Returns 0 on success, or -1 on failure.
202 */
203int
204rcsnum_aton(const char *str, char **ep, RCSNUM *nump)
205{
206	u_int32_t val;
207	const char *sp;
208	void *tmp;
209
210	if (nump->rn_id == NULL) {
211		nump->rn_id = (u_int16_t *)malloc(sizeof(u_int16_t));
212		if (nump->rn_id == NULL) {
213			cvs_log(LP_ERRNO, "failed to allocate RCSNUM");
214			return (-1);
215		}
216	}
217
218	nump->rn_len = 0;
219	nump->rn_id[0] = 0;
220
221	for (sp = str;; sp++) {
222		if (!isdigit(*sp) && (*sp != '.'))
223			break;
224
225		if (*sp == '.') {
226			if (nump->rn_len >= RCSNUM_MAXLEN - 1) {
227				cvs_log(LP_ERR,
228				    "RCSNUM exceeds maximum length");
229				goto rcsnum_aton_failed;
230			}
231
232			nump->rn_len++;
233			tmp = realloc(nump->rn_id,
234			    (nump->rn_len + 1) * sizeof(u_int16_t));
235			if (tmp == NULL)
236				goto rcsnum_aton_failed;
237			nump->rn_id = (u_int16_t *)tmp;
238			nump->rn_id[nump->rn_len] = 0;
239			continue;
240		}
241
242		val = (nump->rn_id[nump->rn_len] * 10) + (*sp - 0x30);
243		if (val > RCSNUM_MAXNUM) {
244			cvs_log(LP_ERR, "RCSNUM overflow");
245			goto rcsnum_aton_failed;
246		}
247
248		nump->rn_id[nump->rn_len] = val;
249	}
250
251	if (ep != NULL)
252		*(const char **)ep = sp;
253
254	nump->rn_len++;
255	return (nump->rn_len);
256
257rcsnum_aton_failed:
258	nump->rn_len = 0;
259	free(nump->rn_id);
260	nump->rn_id = NULL;
261	return (-1);
262}
263