Annotation of src/usr.bin/cvs/hist.c, Revision 1.12
1.12 ! joris 1: /* $OpenBSD: hist.c,v 1.11 2005/09/05 19:45:42 xsa Exp $ */
1.1 jfb 2: /*
3: * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
1.3 tedu 4: * All rights reserved.
1.1 jfb 5: *
1.3 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: *
1.3 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
1.3 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
1.3 tedu 24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1 jfb 25: */
26:
27: #include <sys/stat.h>
28:
1.5 xsa 29: #include <fcntl.h>
1.1 jfb 30: #include <stdio.h>
31: #include <stdlib.h>
1.5 xsa 32: #include <string.h>
1.1 jfb 33: #include <unistd.h>
34:
1.5 xsa 35: #include "cvs.h"
1.1 jfb 36: #include "log.h"
37:
1.7 xsa 38: #define CVS_HIST_BUFSIZE 8192
1.1 jfb 39:
40:
41:
1.7 xsa 42: static int cvs_hist_fillbuf(CVSHIST *);
43: static int cvs_hist_fmt(const struct cvs_hent *, char *, size_t);
1.1 jfb 44:
45:
46: /*
47: * cvs_hist_open()
48: *
49: * Open a CVS history file.
50: * Returns the number of entries in the file on success, or -1 on error.
51: */
1.8 xsa 52: CVSHIST *
1.1 jfb 53: cvs_hist_open(const char *path)
54: {
55: CVSHIST *histp;
56:
1.12 ! joris 57: histp = (CVSHIST *)xmalloc(sizeof(*histp));
1.1 jfb 58: memset(histp, 0, sizeof(*histp));
59:
1.12 ! joris 60: histp->chf_buf = (char *)xmalloc((size_t)CVS_HIST_BUFSIZE);
1.1 jfb 61: histp->chf_blen = CVS_HIST_BUFSIZE;
62: histp->chf_off = 0;
63:
64: histp->chf_sindex = 0;
65: histp->chf_cindex = 0;
66: histp->chf_nbhent = 0;
1.11 xsa 67:
68: cvs_log(LP_TRACE, "cvs_hist_open(%s)", path);
1.1 jfb 69:
70: histp->chf_fd = open(path, O_RDONLY, 0);
71: if (histp->chf_fd == -1) {
72: cvs_log(LP_ERRNO,
73: "failed to open CVS history file `%s'", path);
1.9 xsa 74: cvs_nolog = 1;
1.12 ! joris 75: xfree(histp->chf_buf);
! 76: xfree(histp);
1.1 jfb 77: return (NULL);
78: }
79:
80: cvs_hist_fillbuf(histp);
81:
82: return (histp);
83: }
84:
85:
86: /*
87: * cvs_hist_close()
88: *
89: * Close the CVS history file previously opened by a call to cvs_hist_open()
90: */
91: void
92: cvs_hist_close(CVSHIST *histp)
93: {
94: if (histp->chf_fd >= 0)
95: (void)close(histp->chf_fd);
1.12 ! joris 96: xfree(histp->chf_buf);
! 97: xfree(histp);
1.1 jfb 98: }
99:
100:
101: /*
102: * cvs_hist_getnext()
103: *
104: * Get the next entry from the history file <histp>. Whenever using this
105: * function, it should be assumed that the return value of the previous call
106: * to cvs_hist_getnext() is now invalid.
107: * Returns the next entry from the file on success, or NULL on failure or if
108: * no entries are left.
109: */
1.8 xsa 110: struct cvs_hent *
1.1 jfb 111: cvs_hist_getnext(CVSHIST *histp)
112: {
113: if (histp->chf_cindex == histp->chf_nbhent) {
114: /* no more cached entries, refill buf and parse */
115: cvs_hist_fillbuf(histp);
116: cvs_hist_parse(histp);
117: }
118: return (&(histp->chf_hent[histp->chf_cindex++]));
119: }
120:
121:
122: /*
123: * cvs_hist_append()
124: *
125: * Append a history entry to the history file <histp>. The file offset is
126: * first set to the end of the file.
127: * Returns 0 on success, or -1 on failure.
128: */
129: int
130: cvs_hist_append(CVSHIST *histp, struct cvs_hent *hentp)
131: {
132: char hbuf[128];
1.9 xsa 133:
134: if (cvs_nolog == 1)
135: return (0);
1.1 jfb 136:
137: if (cvs_hist_fmt(hentp, hbuf, sizeof(hbuf)) < 0) {
138: cvs_log(LP_ERR, "failed to append CVS history entry");
139: return (-1);
140: }
141:
142: /* position ourself at the end */
143: if (lseek(histp->chf_fd, (off_t)0, SEEK_END) == -1) {
144: cvs_log(LP_ERRNO, "failed to seek to end of CVS history file");
145: return (-1);
146: }
147:
148: if (write(histp->chf_fd, hbuf, strlen(hbuf)) == -1) {
149: cvs_log(LP_ERR, "failed to write CVS history entry to file");
150: return (-1);
151: }
152:
153: return (0);
154: }
155:
156:
157:
158: /*
159: * cvs_hist_fillbuf()
160: *
161: * Fill the history file's internal buffer for future parsing.
162: */
163: static int
164: cvs_hist_fillbuf(CVSHIST *histp)
165: {
166: ssize_t ret;
167:
168: /* reposition ourself in case we're missing the start of a record */
169: if (lseek(histp->chf_fd, histp->chf_off, SEEK_SET) == -1) {
170: cvs_log(LP_ERRNO, "failed to seek in CVS history file");
171: return (-1);
172: }
173: ret = read(histp->chf_fd, histp->chf_buf, histp->chf_blen);
174: if (ret == -1) {
175: cvs_log(LP_ERRNO, "failed to buffer CVS history file");
176: return (-1);
1.2 deraadt 177: } else {
1.1 jfb 178: histp->chf_bused = (size_t)ret;
179: }
180:
181: return (ret);
182: }
183:
184:
185: /*
186: * cvs_hist_parse()
187: *
188: * Parse the current contents of the internal buffer of <histp> and regenerate
189: * the buffered history entries.
190: * Returns the number of entries parsed on success, or -1 on failure.
191: */
192: int
193: cvs_hist_parse(CVSHIST *histp)
194: {
195: u_int i, fld;
196: char *fields[CVS_HIST_NBFLD], *sp, *bep, *ep, *errp;
197:
198: sp = histp->chf_buf;
199: bep = histp->chf_buf + histp->chf_bused - 1;
200:
201: for (i = 0; i < CVS_HIST_CACHE; i++) {
202: ep = memchr(sp, '\n', bep - sp);
203: if (ep == NULL) {
204: /*
205: * No record or incomplete record left to parse,
206: * so adjust the next read offset in consequence.
207: */
208: histp->chf_off += (off_t)(sp - histp->chf_buf);
209: break;
1.2 deraadt 210: } else if (ep == bep) {
1.1 jfb 211: histp->chf_off += (off_t)histp->chf_bused;
212: }
213: *(ep++) = '\0';
214:
215: printf("hist(%s)\n", sp);
216:
217: histp->chf_hent[i].ch_event = *sp++;
218:
219: /* split the record in fields */
220: fields[0] = sp;
221:
222: fld = 1;
223: while (sp < ep) {
224: if (*sp == '|') {
225: *sp = '\0';
226: fields[fld++] = sp + 1;
227: }
228: if (fld == CVS_HIST_NBFLD)
229: break;
230: sp++;
231: }
232: #if 0
233: for (fld = 0; fld < CVS_HIST_NBFLD; fld++)
234: printf("fields[%u] = `%s'\n", fld, fields[fld]);
235: #endif
236:
237: histp->chf_hent[i].ch_date = (time_t)strtol(fields[0],
238: &errp, 16);
239: if (*errp != '\0') {
240: cvs_log(LP_ERR,
241: "parse error in date field of CVS history entry");
242: continue;
243: }
244:
245: histp->chf_hent[i].ch_user = fields[1];
246: histp->chf_hent[i].ch_curdir = fields[2];
247: histp->chf_hent[i].ch_repo = fields[3];
248: histp->chf_hent[i].ch_rev = rcsnum_alloc();
249: rcsnum_aton(fields[4], NULL, histp->chf_hent[i].ch_rev);
250: histp->chf_hent[i].ch_arg = fields[5];
251: sp = ep;
252: }
253:
254: /* update indexes */
255: histp->chf_sindex += histp->chf_nbhent;
256: histp->chf_nbhent = i;
257: histp->chf_cindex = 0;
258:
259:
260: return (i);
261: }
262:
263:
264: /*
265: * cvs_hist_fmt()
266: *
267: * Format the contents of the CVS history entry <ent> into the format used in
268: * the CVS `history' file, and store the resulting string in <buf>, which is
269: * of size <blen>.
270: */
271: static int
272: cvs_hist_fmt(const struct cvs_hent *ent, char *buf, size_t blen)
273: {
274: char numbuf[64];
1.4 joris 275: int len;
1.1 jfb 276:
1.3 tedu 277: if (rcsnum_tostr(ent->ch_rev, numbuf, sizeof(numbuf)) == NULL)
1.1 jfb 278: return (-1);
279:
1.4 joris 280: len = snprintf(buf, blen, "%c%8x|%s|%s|%s|%s|%s",
1.1 jfb 281: ent->ch_event, ent->ch_date, ent->ch_user, ent->ch_curdir,
1.4 joris 282: ent->ch_repo, numbuf, ent->ch_arg);
283: if (len >= (int)blen || len == -1)
284: return (-1);
285: return (len);
1.1 jfb 286: }
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