Annotation of src/usr.bin/cvs/buf.c, Revision 1.71
1.71 ! tobias 1: /* $OpenBSD: buf.c,v 1.70 2008/03/08 11:53:36 joris Exp $ */
1.1 jfb 2: /*
1.2 jfb 3: * Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.org>
1.1 jfb 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:
1.60 otto 27: #include <sys/stat.h>
1.67 tobias 28: #include <sys/time.h>
1.60 otto 29:
30: #include <errno.h>
31: #include <fcntl.h>
1.66 chl 32: #include <stdlib.h>
1.60 otto 33: #include <string.h>
34: #include <unistd.h>
1.1 jfb 35:
1.65 tobias 36: #include "atomicio.h"
1.51 joris 37: #include "cvs.h"
1.1 jfb 38: #include "buf.h"
39:
1.15 xsa 40: #define BUF_INCR 128
1.1 jfb 41:
42: struct cvs_buf {
1.57 ray 43: /* buffer handle, buffer size, and data length */
1.15 xsa 44: u_char *cb_buf;
45: size_t cb_size;
46: size_t cb_len;
1.1 jfb 47: };
48:
1.57 ray 49: #define SIZE_LEFT(b) (b->cb_size - b->cb_len)
1.1 jfb 50:
1.46 ray 51: static void cvs_buf_grow(BUF *, size_t);
1.1 jfb 52:
53: /*
54: * cvs_buf_alloc()
55: *
56: * Create a new buffer structure and return a pointer to it. This structure
57: * uses dynamically-allocated memory and must be freed with cvs_buf_free(),
58: * once the buffer is no longer needed.
59: */
1.15 xsa 60: BUF *
1.68 tobias 61: cvs_buf_alloc(size_t len)
1.1 jfb 62: {
63: BUF *b;
64:
1.42 ray 65: b = xmalloc(sizeof(*b));
1.30 niallo 66: /* Postpone creation of zero-sized buffers */
1.47 ray 67: if (len > 0)
68: b->cb_buf = xcalloc(1, len);
69: else
1.31 niallo 70: b->cb_buf = NULL;
1.1 jfb 71:
72: b->cb_size = len;
73: b->cb_len = 0;
74:
75: return (b);
76: }
77:
1.15 xsa 78: BUF *
1.68 tobias 79: cvs_buf_load(const char *path)
1.1 jfb 80: {
81: int fd;
1.54 joris 82: BUF *bp;
83:
84: if ((fd = open(path, O_RDONLY, 0600)) == -1)
1.63 joris 85: fatal("cvs_buf_load: failed to load '%s' : %s", path,
1.54 joris 86: strerror(errno));
87:
1.68 tobias 88: bp = cvs_buf_load_fd(fd);
1.54 joris 89: (void)close(fd);
90: return (bp);
91: }
92:
93: BUF *
1.68 tobias 94: cvs_buf_load_fd(int fd)
1.54 joris 95: {
1.1 jfb 96: struct stat st;
97: BUF *buf;
98:
1.54 joris 99: if (fstat(fd, &st) == -1)
100: fatal("cvs_buf_load_fd: fstat: %s", strerror(errno));
1.1 jfb 101:
1.54 joris 102: if (lseek(fd, 0, SEEK_SET) == -1)
103: fatal("cvs_buf_load_fd: lseek: %s", strerror(errno));
1.1 jfb 104:
1.71 ! tobias 105: if (st.st_size > SIZE_MAX)
! 106: fatal("cvs_buf_load_fd: file size too big");
1.68 tobias 107: buf = cvs_buf_alloc(st.st_size);
1.65 tobias 108: if (atomicio(read, fd, buf->cb_buf, buf->cb_size) != buf->cb_size)
109: fatal("cvs_buf_load_fd: read: %s", strerror(errno));
110: buf->cb_len = buf->cb_size;
1.1 jfb 111:
112: return (buf);
113: }
114:
115: /*
116: * cvs_buf_free()
117: *
118: * Free the buffer <b> and all associated data.
119: */
120: void
121: cvs_buf_free(BUF *b)
122: {
1.31 niallo 123: if (b->cb_buf != NULL)
124: xfree(b->cb_buf);
1.19 joris 125: xfree(b);
1.1 jfb 126: }
127:
128: /*
129: * cvs_buf_release()
130: *
131: * Free the buffer <b>'s structural information but do not free the contents
132: * of the buffer. Instead, they are returned and should be freed later using
133: * free().
134: */
1.58 otto 135: u_char *
1.1 jfb 136: cvs_buf_release(BUF *b)
137: {
1.8 jfb 138: u_char *tmp;
1.6 tedu 139:
1.1 jfb 140: tmp = b->cb_buf;
1.19 joris 141: xfree(b);
1.1 jfb 142: return (tmp);
143: }
144:
145: /*
146: * cvs_buf_empty()
147: *
148: * Empty the contents of the buffer <b> and reset pointers.
149: */
150: void
151: cvs_buf_empty(BUF *b)
152: {
1.16 moritz 153: memset(b->cb_buf, 0, b->cb_size);
1.1 jfb 154: b->cb_len = 0;
155: }
156:
157: /*
158: * cvs_buf_putc()
159: *
160: * Append a single character <c> to the end of the buffer <b>.
161: */
1.39 xsa 162: void
1.1 jfb 163: cvs_buf_putc(BUF *b, int c)
164: {
165: u_char *bp;
166:
1.57 ray 167: bp = b->cb_buf + b->cb_len;
1.1 jfb 168: if (bp == (b->cb_buf + b->cb_size)) {
169: /* extend */
1.68 tobias 170: cvs_buf_grow(b, (size_t)BUF_INCR);
1.1 jfb 171:
172: /* the buffer might have been moved */
1.57 ray 173: bp = b->cb_buf + b->cb_len;
1.1 jfb 174: }
175: *bp = (u_char)c;
176: b->cb_len++;
1.29 niallo 177: }
178:
179: /*
180: * cvs_buf_getc()
181: *
182: * Return u_char at buffer position <pos>.
183: *
184: */
185: u_char
1.40 ray 186: cvs_buf_getc(BUF *b, size_t pos)
1.29 niallo 187: {
1.57 ray 188: return (b->cb_buf[pos]);
1.1 jfb 189: }
190:
191: /*
192: * cvs_buf_append()
193: *
194: * Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
195: * buffer is too small to accept all data, it will attempt to append as much
196: * data as possible, or if the BUF_AUTOEXT flag is set for the buffer, it
197: * will get resized to an appropriate size to accept all data.
1.27 joris 198: * Returns the number of bytes successfully appended to the buffer.
1.1 jfb 199: */
1.68 tobias 200: void
1.1 jfb 201: cvs_buf_append(BUF *b, const void *data, size_t len)
202: {
1.68 tobias 203: size_t left;
1.8 jfb 204: u_char *bp, *bep;
1.1 jfb 205:
1.57 ray 206: bp = b->cb_buf + b->cb_len;
1.1 jfb 207: bep = b->cb_buf + b->cb_size;
208: left = bep - bp;
209:
210: if (left < len) {
1.68 tobias 211: cvs_buf_grow(b, len - left);
212: bp = b->cb_buf + b->cb_len;
1.1 jfb 213: }
214:
1.68 tobias 215: memcpy(bp, data, len);
216: b->cb_len += len;
1.1 jfb 217: }
218:
219: /*
1.16 moritz 220: * cvs_buf_len()
1.1 jfb 221: *
222: * Returns the size of the buffer that is being used.
223: */
224: size_t
1.16 moritz 225: cvs_buf_len(BUF *b)
1.1 jfb 226: {
227: return (b->cb_len);
228: }
229:
230: /*
1.7 djm 231: * cvs_buf_write_fd()
1.1 jfb 232: *
1.7 djm 233: * Write the contents of the buffer <b> to the specified <fd>
1.1 jfb 234: */
235: int
1.7 djm 236: cvs_buf_write_fd(BUF *b, int fd)
1.1 jfb 237: {
1.65 tobias 238: if (atomicio(vwrite, fd, b->cb_buf, b->cb_len) != b->cb_len)
239: return (-1);
1.7 djm 240: return (0);
241: }
242:
243: /*
244: * cvs_buf_write()
245: *
246: * Write the contents of the buffer <b> to the file whose path is given in
247: * <path>. If the file does not exist, it is created with mode <mode>.
248: */
249: int
250: cvs_buf_write(BUF *b, const char *path, mode_t mode)
251: {
1.22 xsa 252: int fd;
1.32 niallo 253: open:
254: if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
1.49 deraadt 255: if (errno == EACCES && unlink(path) != -1)
1.32 niallo 256: goto open;
257: else
258: fatal("open: `%s': %s", path, strerror(errno));
259: }
1.7 djm 260:
1.22 xsa 261: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 262: (void)unlink(path);
1.22 xsa 263: fatal("cvs_buf_write: cvs_buf_write_fd: `%s'", path);
1.7 djm 264: }
1.44 niallo 265:
266: if (fchmod(fd, mode) < 0)
1.51 joris 267: cvs_log(LP_ERR, "permissions not set on file %s", path);
1.44 niallo 268:
1.1 jfb 269: (void)close(fd);
1.24 joris 270:
1.22 xsa 271: return (0);
1.1 jfb 272: }
273:
1.7 djm 274: /*
275: * cvs_buf_write_stmp()
276: *
1.13 joris 277: * Write the contents of the buffer <b> to a temporary file whose path is
1.7 djm 278: * specified using <template> (see mkstemp.3). NB. This function will modify
279: * <template>, as per mkstemp
280: */
1.69 joris 281: int
1.55 ray 282: cvs_buf_write_stmp(BUF *b, char *template, struct timeval *tv)
1.7 djm 283: {
1.22 xsa 284: int fd;
1.7 djm 285:
1.20 xsa 286: if ((fd = mkstemp(template)) == -1)
287: fatal("mkstemp: `%s': %s", template, strerror(errno));
1.7 djm 288:
1.22 xsa 289: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 290: (void)unlink(template);
1.22 xsa 291: fatal("cvs_buf_write_stmp: cvs_buf_write_fd: `%s'", template);
1.7 djm 292: }
1.44 niallo 293:
1.51 joris 294: if (tv != NULL) {
295: if (futimes(fd, tv) == -1)
296: fatal("cvs_buf_write_stmp: futimes failed");
297: }
298:
1.69 joris 299: cvs_worklist_add(template, &temp_files);
300:
1.70 joris 301: if (lseek(fd, 0, SEEK_SET) < 0)
1.69 joris 302: fatal("cvs_buf_write_stmp: lseek: %s", strerror(errno));
1.51 joris 303:
1.69 joris 304: return (fd);
1.7 djm 305: }
1.1 jfb 306:
307: /*
308: * cvs_buf_grow()
309: *
310: * Grow the buffer <b> by <len> bytes. The contents are unchanged by this
311: * operation regardless of the result.
312: */
1.46 ray 313: static void
1.1 jfb 314: cvs_buf_grow(BUF *b, size_t len)
315: {
1.61 ray 316: b->cb_buf = xrealloc(b->cb_buf, 1, b->cb_size + len);
1.1 jfb 317: b->cb_size += len;
318: }
1.43 xsa 319:
320: /*
321: * cvs_buf_copy()
322: *
323: * Copy the first <len> bytes of data in the buffer <b> starting at offset
324: * <off> in the destination buffer <dst>, which can accept up to <len> bytes.
325: * Returns the number of bytes successfully copied, or -1 on failure.
326: */
327: ssize_t
328: cvs_buf_copy(BUF *b, size_t off, void *dst, size_t len)
329: {
330: size_t rc;
331:
332: if (off > b->cb_len)
333: fatal("cvs_buf_copy failed");
334:
335: rc = MIN(len, (b->cb_len - off));
336: memcpy(dst, b->cb_buf + off, rc);
337:
338: return (ssize_t)rc;
339: }
340:
341: /*
342: * cvs_buf_peek()
343: *
344: * Peek at the contents of the buffer <b> at offset <off>.
345: */
1.58 otto 346: const u_char *
1.43 xsa 347: cvs_buf_peek(BUF *b, size_t off)
348: {
349: if (off >= b->cb_len)
350: return (NULL);
351:
352: return (b->cb_buf + off);
1.52 joris 353: }
354:
355: int
1.59 ray 356: cvs_buf_differ(const BUF *b1, const BUF *b2)
1.52 joris 357: {
1.59 ray 358: if (b1->cb_len != b2->cb_len)
1.52 joris 359: return (1);
360:
1.59 ray 361: return (memcmp(b1->cb_buf, b2->cb_buf, b1->cb_len));
1.43 xsa 362: }
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