rcsnum.c revision 1.6
1/* $OpenBSD: rcsnum.c,v 1.6 2005/01/03 22:10:12 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_free() 63 * 64 * Free an RCSNUM structure previously allocated with rcsnum_alloc(). 65 */ 66 67void 68rcsnum_free(RCSNUM *rn) 69{ 70 if (rn->rn_id != NULL) 71 free(rn->rn_id); 72 free(rn); 73} 74 75 76/* 77 * rcsnum_tostr() 78 * Returns a pointer to the start of <buf> on success, or NULL on failure. 79 */ 80char* 81rcsnum_tostr(const RCSNUM *nump, char *buf, size_t blen) 82{ 83 u_int i; 84 char tmp[8]; 85 86 if (nump->rn_len == 0) { 87 buf[0] = '\0'; 88 return (buf); 89 } 90 91 snprintf(buf, blen, "%u", nump->rn_id[0]); 92 for (i = 1; i < nump->rn_len; i++) { 93 snprintf(tmp, sizeof(tmp), ".%u", nump->rn_id[i]); 94 strlcat(buf, tmp, blen); 95 } 96 97 return (buf); 98} 99 100 101/* 102 * rcsnum_cpy() 103 * 104 * Copy the number stored in <nsrc> in the destination <ndst> up to <depth> 105 * numbers deep. 106 * Returns 0 on success, or -1 on failure. 107 */ 108int 109rcsnum_cpy(const RCSNUM *nsrc, RCSNUM *ndst, u_int depth) 110{ 111 u_int len; 112 size_t sz; 113 void *tmp; 114 115 len = nsrc->rn_len; 116 if ((depth != 0) && (len > depth)) 117 len = depth; 118 sz = len * sizeof(u_int16_t); 119 120 tmp = realloc(ndst->rn_id, sz); 121 if (tmp == NULL) { 122 cvs_log(LP_ERR, "failed to reallocate RCSNUM"); 123 return (-1); 124 } 125 126 ndst->rn_id = (u_int16_t *)tmp; 127 ndst->rn_len = len; 128 memcpy(ndst->rn_id, nsrc->rn_id, sz); 129 return (0); 130} 131 132 133/* 134 * rcsnum_cmp() 135 * 136 * Compare the two numbers <n1> and <n2>. Returns -1 if <n1> is larger than 137 * <n2>, 0 if they are both the same, and 1 if <n2> is larger than <n1>. 138 * The <depth> argument specifies how many numbers deep should be checked for 139 * the result. A value of 0 means that the depth will be the minimum of the 140 * two numbers. 141 */ 142int 143rcsnum_cmp(const RCSNUM *n1, const RCSNUM *n2, u_int depth) 144{ 145 int res; 146 u_int i; 147 size_t slen; 148 149 slen = MIN(n1->rn_len, n2->rn_len); 150 if ((depth != 0) && (slen > depth)) 151 slen = depth; 152 153 for (i = 0; i < slen; i++) { 154 res = n1->rn_id[i] - n2->rn_id[i]; 155 if (res < 0) 156 return (1); 157 else if (res > 0) 158 return (-1); 159 } 160 161 if (n1->rn_len > n2->rn_len) 162 return (-1); 163 else if (n2->rn_len > n1->rn_len) 164 return (1); 165 166 return (0); 167} 168 169 170/* 171 * rcsnum_aton() 172 * 173 * Translate the string <str> containing a sequence of digits and periods into 174 * its binary representation, which is stored in <nump>. The address of the 175 * first byte not part of the number is stored in <ep> on return, if it is not 176 * NULL. 177 * Returns 0 on success, or -1 on failure. 178 */ 179int 180rcsnum_aton(const char *str, char **ep, RCSNUM *nump) 181{ 182 u_int32_t val; 183 const char *sp; 184 void *tmp; 185 186 if (nump->rn_id == NULL) { 187 nump->rn_id = (u_int16_t *)malloc(sizeof(u_int16_t)); 188 if (nump->rn_id == NULL) { 189 cvs_log(LP_ERRNO, "failed to allocate RCSNUM"); 190 return (-1); 191 } 192 } 193 194 nump->rn_len = 0; 195 nump->rn_id[0] = 0; 196 197 for (sp = str;; sp++) { 198 if (!isdigit(*sp) && (*sp != '.')) 199 break; 200 201 if (*sp == '.') { 202 if (nump->rn_len >= RCSNUM_MAXLEN - 1) { 203 cvs_log(LP_ERR, 204 "RCSNUM exceeds maximum length"); 205 goto rcsnum_aton_failed; 206 } 207 208 nump->rn_len++; 209 tmp = realloc(nump->rn_id, 210 (nump->rn_len + 1) * sizeof(u_int16_t)); 211 if (tmp == NULL) { 212 goto rcsnum_aton_failed; 213 } 214 nump->rn_id = (u_int16_t *)tmp; 215 nump->rn_id[nump->rn_len] = 0; 216 continue; 217 } 218 219 val = (nump->rn_id[nump->rn_len] * 10) + (*sp - 0x30); 220 if (val > RCSNUM_MAXNUM) { 221 cvs_log(LP_ERR, "RCSNUM overflow"); 222 goto rcsnum_aton_failed; 223 } 224 225 nump->rn_id[nump->rn_len] = val; 226 } 227 228 if (ep != NULL) 229 *(const char **)ep = sp; 230 231 nump->rn_len++; 232 return (nump->rn_len); 233 234rcsnum_aton_failed: 235 nump->rn_len = 0; 236 free(nump->rn_id); 237 nump->rn_id = NULL; 238 return (-1); 239} 240