Annotation of src/usr.bin/cvs/rcsnum.c, Revision 1.10
1.10 ! jfb 1: /* $OpenBSD: rcsnum.c,v 1.9 2005/03/05 05:58:39 jfb Exp $ */
1.1 jfb 2: /*
3: * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
1.4 tedu 4: * All rights reserved.
1.1 jfb 5: *
1.4 tedu 6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
1.1 jfb 9: *
1.4 tedu 10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
1.1 jfb 12: * 2. The name of the author may not be used to endorse or promote products
1.4 tedu 13: * derived from this software without specific prior written permission.
1.1 jfb 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
1.4 tedu 24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1 jfb 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: */
44: RCSNUM*
45: rcsnum_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: /*
1.7 jfb 62: * rcsnum_parse()
63: *
64: * Parse a string specifying an RCS number and return the corresponding RCSNUM.
65: */
66: RCSNUM*
67: rcsnum_parse(const char *str)
68: {
69: char *ep;
70: RCSNUM *num;
71:
72: if ((num = rcsnum_alloc()) == NULL)
73: return (NULL);
74:
1.8 jfb 75: if ((rcsnum_aton(str, &ep, num) < 0) || (*ep != '\0')) {
1.7 jfb 76: rcsnum_free(num);
1.9 jfb 77: num = NULL;
78: if (*ep != '\0')
79: rcs_errno = RCS_ERR_BADNUM;
1.7 jfb 80: }
81:
82: return (num);
83: }
84:
85:
86: /*
1.1 jfb 87: * rcsnum_free()
88: *
89: * Free an RCSNUM structure previously allocated with rcsnum_alloc().
90: */
91: void
92: rcsnum_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()
1.10 ! jfb 102: *
! 103: * Format the RCS number <nump> into a human-readable dot-separated
! 104: * representation and store the resulting string in <buf>, which is of size
! 105: * <blen>.
1.1 jfb 106: * Returns a pointer to the start of <buf> on success, or NULL on failure.
107: */
108: char*
109: rcsnum_tostr(const RCSNUM *nump, char *buf, size_t blen)
110: {
111: u_int i;
112: char tmp[8];
113:
1.10 ! jfb 114: if ((nump == NULL) || (nump->rn_len == 0)) {
1.1 jfb 115: buf[0] = '\0';
116: return (buf);
117: }
118:
1.4 tedu 119: snprintf(buf, blen, "%u", nump->rn_id[0]);
1.1 jfb 120: for (i = 1; i < nump->rn_len; i++) {
121: snprintf(tmp, sizeof(tmp), ".%u", nump->rn_id[i]);
122: strlcat(buf, tmp, blen);
123: }
124:
125: return (buf);
126: }
127:
128:
129: /*
130: * rcsnum_cpy()
131: *
132: * Copy the number stored in <nsrc> in the destination <ndst> up to <depth>
133: * numbers deep.
134: * Returns 0 on success, or -1 on failure.
135: */
136: int
137: rcsnum_cpy(const RCSNUM *nsrc, RCSNUM *ndst, u_int depth)
138: {
139: u_int len;
140: size_t sz;
141: void *tmp;
142:
143: len = nsrc->rn_len;
144: if ((depth != 0) && (len > depth))
145: len = depth;
146: sz = len * sizeof(u_int16_t);
147:
148: tmp = realloc(ndst->rn_id, sz);
149: if (tmp == NULL) {
150: cvs_log(LP_ERR, "failed to reallocate RCSNUM");
151: return (-1);
152: }
153:
154: ndst->rn_id = (u_int16_t *)tmp;
155: ndst->rn_len = len;
156: memcpy(ndst->rn_id, nsrc->rn_id, sz);
157: return (0);
158: }
159:
160:
161: /*
162: * rcsnum_cmp()
163: *
164: * Compare the two numbers <n1> and <n2>. Returns -1 if <n1> is larger than
165: * <n2>, 0 if they are both the same, and 1 if <n2> is larger than <n1>.
166: * The <depth> argument specifies how many numbers deep should be checked for
167: * the result. A value of 0 means that the depth will be the minimum of the
168: * two numbers.
169: */
170: int
171: rcsnum_cmp(const RCSNUM *n1, const RCSNUM *n2, u_int depth)
172: {
173: int res;
174: u_int i;
175: size_t slen;
176:
177: slen = MIN(n1->rn_len, n2->rn_len);
178: if ((depth != 0) && (slen > depth))
179: slen = depth;
1.4 tedu 180:
1.1 jfb 181: for (i = 0; i < slen; i++) {
182: res = n1->rn_id[i] - n2->rn_id[i];
183: if (res < 0)
184: return (1);
185: else if (res > 0)
186: return (-1);
187: }
188:
189: if (n1->rn_len > n2->rn_len)
190: return (-1);
191: else if (n2->rn_len > n1->rn_len)
192: return (1);
193:
194: return (0);
195: }
196:
197:
198: /*
199: * rcsnum_aton()
200: *
201: * Translate the string <str> containing a sequence of digits and periods into
202: * its binary representation, which is stored in <nump>. The address of the
203: * first byte not part of the number is stored in <ep> on return, if it is not
204: * NULL.
205: * Returns 0 on success, or -1 on failure.
206: */
207: int
208: rcsnum_aton(const char *str, char **ep, RCSNUM *nump)
209: {
1.6 jfb 210: u_int32_t val;
1.1 jfb 211: const char *sp;
212: void *tmp;
213:
1.2 vincent 214: if (nump->rn_id == NULL) {
215: nump->rn_id = (u_int16_t *)malloc(sizeof(u_int16_t));
1.6 jfb 216: if (nump->rn_id == NULL) {
217: cvs_log(LP_ERRNO, "failed to allocate RCSNUM");
1.2 vincent 218: return (-1);
1.6 jfb 219: }
1.2 vincent 220: }
1.1 jfb 221:
222: nump->rn_len = 0;
1.6 jfb 223: nump->rn_id[0] = 0;
1.1 jfb 224:
1.3 jfb 225: for (sp = str;; sp++) {
226: if (!isdigit(*sp) && (*sp != '.'))
1.1 jfb 227: break;
228:
229: if (*sp == '.') {
1.6 jfb 230: if (nump->rn_len >= RCSNUM_MAXLEN - 1) {
231: cvs_log(LP_ERR,
232: "RCSNUM exceeds maximum length");
233: goto rcsnum_aton_failed;
234: }
235:
1.1 jfb 236: nump->rn_len++;
237: tmp = realloc(nump->rn_id,
238: (nump->rn_len + 1) * sizeof(u_int16_t));
1.9 jfb 239: if (tmp == NULL)
1.6 jfb 240: goto rcsnum_aton_failed;
1.1 jfb 241: nump->rn_id = (u_int16_t *)tmp;
1.2 vincent 242: nump->rn_id[nump->rn_len] = 0;
1.1 jfb 243: continue;
244: }
245:
1.6 jfb 246: val = (nump->rn_id[nump->rn_len] * 10) + (*sp - 0x30);
247: if (val > RCSNUM_MAXNUM) {
248: cvs_log(LP_ERR, "RCSNUM overflow");
249: goto rcsnum_aton_failed;
250: }
251:
252: nump->rn_id[nump->rn_len] = val;
1.1 jfb 253: }
254:
255: if (ep != NULL)
1.5 jfb 256: *(const char **)ep = sp;
1.1 jfb 257:
258: nump->rn_len++;
259: return (nump->rn_len);
1.6 jfb 260:
261: rcsnum_aton_failed:
262: nump->rn_len = 0;
263: free(nump->rn_id);
264: nump->rn_id = NULL;
265: return (-1);
1.1 jfb 266: }
![[BACK]](/icons/back.gif){kind=icon}
Return to rcsnum.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / cvs