Annotation of src/usr.bin/cvs/rcsnum.c, Revision 1.1
1.1 ! jfb 1: /* $OpenBSD$ */
! 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:
! 30: #include <ctype.h>
! 31: #include <stdio.h>
! 32: #include <stdlib.h>
! 33: #include <string.h>
! 34:
! 35: #include "rcs.h"
! 36: #include "log.h"
! 37:
! 38:
! 39:
! 40: /*
! 41: * rcsnum_alloc()
! 42: *
! 43: * Allocate an RCS number structure.
! 44: */
! 45:
! 46: RCSNUM*
! 47: rcsnum_alloc(void)
! 48: {
! 49: RCSNUM *rnp;
! 50:
! 51: rnp = (RCSNUM *)malloc(sizeof(*rnp));
! 52: if (rnp == NULL) {
! 53: cvs_log(LP_ERR, "failed to allocate RCS number");
! 54: return (NULL);
! 55: }
! 56: rnp->rn_len = 0;
! 57: rnp->rn_id = NULL;
! 58:
! 59: return (rnp);
! 60: }
! 61:
! 62:
! 63: /*
! 64: * rcsnum_free()
! 65: *
! 66: * Free an RCSNUM structure previously allocated with rcsnum_alloc().
! 67: */
! 68:
! 69: void
! 70: rcsnum_free(RCSNUM *rn)
! 71: {
! 72: if (rn->rn_id != NULL)
! 73: free(rn->rn_id);
! 74: free(rn);
! 75: }
! 76:
! 77:
! 78: /*
! 79: * rcsnum_tostr()
! 80: * Returns a pointer to the start of <buf> on success, or NULL on failure.
! 81: */
! 82:
! 83: char*
! 84: rcsnum_tostr(const RCSNUM *nump, char *buf, size_t blen)
! 85: {
! 86: u_int i;
! 87: char tmp[8];
! 88:
! 89: if (nump->rn_len == 0) {
! 90: buf[0] = '\0';
! 91: return (buf);
! 92: }
! 93:
! 94: snprintf(buf, blen, "%u", nump->rn_id[0]);
! 95: for (i = 1; i < nump->rn_len; i++) {
! 96: snprintf(tmp, sizeof(tmp), ".%u", nump->rn_id[i]);
! 97: strlcat(buf, tmp, blen);
! 98: }
! 99:
! 100: return (buf);
! 101: }
! 102:
! 103:
! 104: /*
! 105: * rcsnum_cpy()
! 106: *
! 107: * Copy the number stored in <nsrc> in the destination <ndst> up to <depth>
! 108: * numbers deep.
! 109: * Returns 0 on success, or -1 on failure.
! 110: */
! 111:
! 112: int
! 113: rcsnum_cpy(const RCSNUM *nsrc, RCSNUM *ndst, u_int depth)
! 114: {
! 115: u_int len;
! 116: size_t sz;
! 117: void *tmp;
! 118:
! 119: len = nsrc->rn_len;
! 120: if ((depth != 0) && (len > depth))
! 121: len = depth;
! 122: sz = len * sizeof(u_int16_t);
! 123:
! 124: tmp = realloc(ndst->rn_id, sz);
! 125: if (tmp == NULL) {
! 126: cvs_log(LP_ERR, "failed to reallocate RCSNUM");
! 127: return (-1);
! 128: }
! 129:
! 130: ndst->rn_id = (u_int16_t *)tmp;
! 131: ndst->rn_len = len;
! 132: memcpy(ndst->rn_id, nsrc->rn_id, sz);
! 133: return (0);
! 134: }
! 135:
! 136:
! 137: /*
! 138: * rcsnum_cmp()
! 139: *
! 140: * Compare the two numbers <n1> and <n2>. Returns -1 if <n1> is larger than
! 141: * <n2>, 0 if they are both the same, and 1 if <n2> is larger than <n1>.
! 142: * The <depth> argument specifies how many numbers deep should be checked for
! 143: * the result. A value of 0 means that the depth will be the minimum of the
! 144: * two numbers.
! 145: */
! 146:
! 147: int
! 148: rcsnum_cmp(const RCSNUM *n1, const RCSNUM *n2, u_int depth)
! 149: {
! 150: int res;
! 151: u_int i;
! 152: size_t slen;
! 153:
! 154: slen = MIN(n1->rn_len, n2->rn_len);
! 155: if ((depth != 0) && (slen > depth))
! 156: slen = depth;
! 157:
! 158: for (i = 0; i < slen; i++) {
! 159: res = n1->rn_id[i] - n2->rn_id[i];
! 160: if (res < 0)
! 161: return (1);
! 162: else if (res > 0)
! 163: return (-1);
! 164: }
! 165:
! 166: if (n1->rn_len > n2->rn_len)
! 167: return (-1);
! 168: else if (n2->rn_len > n1->rn_len)
! 169: return (1);
! 170:
! 171: return (0);
! 172: }
! 173:
! 174:
! 175: /*
! 176: * rcsnum_aton()
! 177: *
! 178: * Translate the string <str> containing a sequence of digits and periods into
! 179: * its binary representation, which is stored in <nump>. The address of the
! 180: * first byte not part of the number is stored in <ep> on return, if it is not
! 181: * NULL.
! 182: * Returns 0 on success, or -1 on failure.
! 183: */
! 184:
! 185: int
! 186: rcsnum_aton(const char *str, char **ep, RCSNUM *nump)
! 187: {
! 188: const char *sp;
! 189: void *tmp;
! 190:
! 191: if (!isdigit(*str))
! 192: return (-1);
! 193:
! 194: nump->rn_id = (u_int16_t *)malloc(sizeof(u_int16_t));
! 195: if (nump->rn_id == NULL)
! 196: return (-1);
! 197:
! 198: nump->rn_len = 0;
! 199:
! 200: for (sp = str; ; sp++) {
! 201: if (!isdigit(*sp) && (*sp != '.')) {
! 202: if (nump->rn_id[nump->rn_len] == 0) {
! 203: return (-1);
! 204: }
! 205: break;
! 206: }
! 207:
! 208: if (*sp == '.') {
! 209: nump->rn_len++;
! 210: tmp = realloc(nump->rn_id,
! 211: (nump->rn_len + 1) * sizeof(u_int16_t));
! 212: if (tmp == NULL) {
! 213: free(nump->rn_id);
! 214: nump->rn_len = 0;
! 215: nump->rn_id = NULL;
! 216: return (-1);
! 217: }
! 218: nump->rn_id = (u_int16_t *)tmp;
! 219: continue;
! 220: }
! 221:
! 222: nump->rn_id[nump->rn_len] *= 10;
! 223: nump->rn_id[nump->rn_len] += *sp - 0x30;
! 224: }
! 225:
! 226: if (ep != NULL)
! 227: *ep = (char *)sp;
! 228:
! 229: nump->rn_len++;
! 230: return (nump->rn_len);
! 231: }
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