rcsnum.c revision 1.37
1/* $OpenBSD: rcsnum.c,v 1.37 2006/05/27 03:30:31 joris 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 "includes.h" 28 29#include "cvs.h" 30#include "log.h" 31#include "rcs.h" 32 33static void rcsnum_setsize(RCSNUM *, u_int); 34static char *rcsnum_itoa(u_int16_t, char *, size_t); 35 36int rcsnum_flags; 37 38/* 39 * rcsnum_alloc() 40 * 41 * Allocate an RCS number structure and return a pointer to it. 42 */ 43RCSNUM * 44rcsnum_alloc(void) 45{ 46 RCSNUM *rnp; 47 48 rnp = xmalloc(sizeof(*rnp)); 49 rnp->rn_len = 0; 50 rnp->rn_id = NULL; 51 52 return (rnp); 53} 54 55/* 56 * rcsnum_parse() 57 * 58 * Parse a string specifying an RCS number and return the corresponding RCSNUM. 59 */ 60RCSNUM * 61rcsnum_parse(const char *str) 62{ 63 char *ep; 64 RCSNUM *num; 65 66 num = rcsnum_alloc(); 67 if (rcsnum_aton(str, &ep, num) < 0 || *ep != '\0') { 68 rcsnum_free(num); 69 num = NULL; 70 if (*ep != '\0') 71 rcs_errno = RCS_ERR_BADNUM; 72 } 73 74 return (num); 75} 76 77/* 78 * rcsnum_free() 79 * 80 * Free an RCSNUM structure previously allocated with rcsnum_alloc(). 81 */ 82void 83rcsnum_free(RCSNUM *rn) 84{ 85 if (rn->rn_id != NULL) 86 xfree(rn->rn_id); 87 xfree(rn); 88} 89 90/* 91 * rcsnum_tostr() 92 * 93 * Format the RCS number <nump> into a human-readable dot-separated 94 * representation and store the resulting string in <buf>, which is of size 95 * <blen>. 96 * Returns a pointer to the start of <buf>. On failure <buf> is set to 97 * an empty string. 98 */ 99char * 100rcsnum_tostr(const RCSNUM *nump, char *buf, size_t blen) 101{ 102 u_int i; 103 char tmp[8]; 104 size_t len; 105 106 if (nump == NULL || nump->rn_len == 0) { 107 buf[0] = '\0'; 108 return (buf); 109 } 110 111 strlcpy(buf, rcsnum_itoa(nump->rn_id[0], buf, blen), blen); 112 for (i = 1; i < nump->rn_len; i++) { 113 len = strlcat(buf, ".", blen); 114 if (len >= blen) 115 fatal("rcsnum_tostr: overflow 1"); 116 117 len = strlcat(buf, 118 rcsnum_itoa(nump->rn_id[i], tmp, sizeof(tmp)), blen); 119 if (len >= blen) 120 fatal("rcsnum_tostr: overflow 2"); 121 } 122 123 return (buf); 124} 125 126static char * 127rcsnum_itoa(u_int16_t num, char *buf, size_t len) 128{ 129 u_int16_t i; 130 char *p; 131 132 if (num == 0) 133 return "0"; 134 135 p = buf + len - 1; 136 i = num; 137 bzero(buf, len); 138 while (i) { 139 *--p = '0' + (i % 10); 140 i /= 10; 141 } 142 return (p); 143} 144 145/* 146 * rcsnum_cpy() 147 * 148 * Copy the number stored in <nsrc> in the destination <ndst> up to <depth> 149 * numbers deep. If <depth> is 0, there is no depth limit. 150 */ 151void 152rcsnum_cpy(const RCSNUM *nsrc, RCSNUM *ndst, u_int depth) 153{ 154 u_int len; 155 void *tmp; 156 157 len = nsrc->rn_len; 158 if (depth != 0 && len > depth) 159 len = depth; 160 161 tmp = xrealloc(ndst->rn_id, len, sizeof(len)); 162 ndst->rn_id = tmp; 163 ndst->rn_len = len; 164 /* Overflow checked in xrealloc(). */ 165 (void)memcpy(ndst->rn_id, nsrc->rn_id, len * sizeof(len)); 166} 167 168/* 169 * rcsnum_cmp() 170 * 171 * Compare the two numbers <n1> and <n2>. Returns -1 if <n1> is larger than 172 * <n2>, 0 if they are both the same, and 1 if <n2> is larger than <n1>. 173 * The <depth> argument specifies how many numbers deep should be checked for 174 * the result. A value of 0 means that the depth will be the minimum of the 175 * two numbers. 176 */ 177int 178rcsnum_cmp(const RCSNUM *n1, const RCSNUM *n2, u_int depth) 179{ 180 int res; 181 u_int i; 182 size_t slen; 183 184 slen = MIN(n1->rn_len, n2->rn_len); 185 if (depth != 0 && slen > depth) 186 slen = depth; 187 188 for (i = 0; i < slen; i++) { 189 res = n1->rn_id[i] - n2->rn_id[i]; 190 if (res < 0) 191 return (1); 192 else if (res > 0) 193 return (-1); 194 } 195 196 if (n1->rn_len > n2->rn_len) 197 return (-1); 198 else if (n2->rn_len > n1->rn_len) 199 return (1); 200 201 return (0); 202} 203 204/* 205 * rcsnum_aton() 206 * 207 * Translate the string <str> containing a sequence of digits and periods into 208 * its binary representation, which is stored in <nump>. The address of the 209 * first byte not part of the number is stored in <ep> on return, if it is not 210 * NULL. 211 * Returns 0 on success, or -1 on failure. 212 */ 213int 214rcsnum_aton(const char *str, char **ep, RCSNUM *nump) 215{ 216 u_int32_t val; 217 const char *sp; 218 void *tmp; 219 char *s; 220 221 if (nump->rn_id == NULL) 222 nump->rn_id = xmalloc(sizeof(*(nump->rn_id))); 223 224 nump->rn_len = 0; 225 nump->rn_id[0] = 0; 226 227 for (sp = str;; sp++) { 228 if (!isdigit(*sp) && (*sp != '.')) 229 break; 230 231 if (*sp == '.') { 232 if (nump->rn_len >= RCSNUM_MAXLEN - 1) { 233 rcs_errno = RCS_ERR_BADNUM; 234 goto rcsnum_aton_failed; 235 } 236 237 nump->rn_len++; 238 tmp = xrealloc(nump->rn_id, 239 nump->rn_len + 1, sizeof(*(nump->rn_id))); 240 nump->rn_id = tmp; 241 nump->rn_id[nump->rn_len] = 0; 242 continue; 243 } 244 245 val = (nump->rn_id[nump->rn_len] * 10) + (*sp - 0x30); 246 if (val > RCSNUM_MAXNUM) 247 fatal("RCSNUM overflow!"); 248 249 nump->rn_id[nump->rn_len] = val; 250 } 251 252 if (ep != NULL) 253 *(const char **)ep = sp; 254 255 /* 256 * Handle "magic" RCS branch numbers. 257 * 258 * What are they? 259 * 260 * Magic branch numbers have an extra .0. at the second farmost 261 * rightside of the branch number, so instead of having an odd 262 * number of dot-separated decimals, it will have an even number. 263 * 264 * Now, according to all the documentation i've found on the net 265 * about this, cvs does this for "efficiency reasons", i'd like 266 * to hear one. 267 * 268 * We just make sure we remove the .0. from in the branch number. 269 * 270 * XXX - for compatibility reasons with GNU cvs we _need_ 271 * to skip this part for the 'log' command, apparently it does 272 * show the magic branches for an unknown and probably 273 * completely insane and not understandable reason in that output. 274 * 275 */ 276 if (nump->rn_len > 2 && nump->rn_id[nump->rn_len - 1] == 0 277 && !(rcsnum_flags & RCSNUM_NO_MAGIC)) { 278 /* 279 * Look for ".0.x" at the end of the branch number. 280 */ 281 if ((s = strrchr(str, '.')) != NULL) { 282 s--; 283 while (*s != '.') 284 s--; 285 286 /* 287 * If we have a "magic" branch, adjust it 288 * so the .0. is removed. 289 */ 290 if (!strncmp(s, RCS_MAGIC_BRANCH, 291 strlen(RCS_MAGIC_BRANCH))) { 292 nump->rn_id[nump->rn_len - 1] = 293 nump->rn_id[nump->rn_len]; 294 nump->rn_len--; 295 } 296 } 297 } 298 299 /* We can't have a single-digit rcs number. */ 300 if (nump->rn_len == 0) { 301 tmp = xrealloc(nump->rn_id, 302 nump->rn_len + 1, sizeof(*(nump->rn_id))); 303 nump->rn_id = tmp; 304 nump->rn_id[nump->rn_len + 1] = 0; 305 nump->rn_len++; 306 } 307 308 nump->rn_len++; 309 return (nump->rn_len); 310 311rcsnum_aton_failed: 312 nump->rn_len = 0; 313 xfree(nump->rn_id); 314 nump->rn_id = NULL; 315 return (-1); 316} 317 318/* 319 * rcsnum_inc() 320 * 321 * Increment the revision number specified in <num>. 322 * Returns a pointer to the <num> on success, or NULL on failure. 323 */ 324RCSNUM * 325rcsnum_inc(RCSNUM *num) 326{ 327 if (num->rn_id[num->rn_len - 1] == RCSNUM_MAXNUM) 328 return (NULL); 329 num->rn_id[num->rn_len - 1]++; 330 return (num); 331} 332 333/* 334 * rcsnum_dec() 335 * 336 * Decreases the revision number specified in <num>, if doing so will not 337 * result in an ending value below 1. E.g. 4.2 will go to 4.1 but 4.1 will 338 * be returned as 4.1. 339 */ 340RCSNUM * 341rcsnum_dec(RCSNUM *num) 342{ 343 /* XXX - Is it an error for the number to be 0? */ 344 if (num->rn_id[num->rn_len - 1] <= 1) 345 return (num); 346 num->rn_id[num->rn_len - 1]--; 347 return (num); 348} 349 350/* 351 * rcsnum_revtobr() 352 * 353 * Retrieve the branch number associated with the revision number <num>. 354 * If <num> is a branch revision, the returned value will be the same 355 * number as the argument. 356 */ 357RCSNUM * 358rcsnum_revtobr(const RCSNUM *num) 359{ 360 RCSNUM *brnum; 361 362 if (num->rn_len < 2) 363 return (NULL); 364 365 brnum = rcsnum_alloc(); 366 rcsnum_cpy(num, brnum, 0); 367 368 if (!RCSNUM_ISBRANCH(brnum)) 369 brnum->rn_len--; 370 371 return (brnum); 372} 373 374/* 375 * rcsnum_brtorev() 376 * 377 * Retrieve the initial revision number associated with the branch number <num>. 378 * If <num> is a revision number, an error will be returned. 379 */ 380RCSNUM * 381rcsnum_brtorev(const RCSNUM *brnum) 382{ 383 RCSNUM *num; 384 385 if (!RCSNUM_ISBRANCH(brnum)) { 386 return (NULL); 387 } 388 389 num = rcsnum_alloc(); 390 rcsnum_setsize(num, brnum->rn_len + 1); 391 rcsnum_cpy(brnum, num, brnum->rn_len); 392 num->rn_id[num->rn_len++] = 1; 393 394 return (num); 395} 396 397static void 398rcsnum_setsize(RCSNUM *num, u_int len) 399{ 400 void *tmp; 401 402 tmp = xrealloc(num->rn_id, len, sizeof(*(num->rn_id))); 403 num->rn_id = tmp; 404 num->rn_len = len; 405} 406