Annotation of src/usr.bin/cvs/buf.c, Revision 1.25
1.25 ! joris 1: /* $OpenBSD: buf.c,v 1.24 2005/12/23 00:27:04 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:
27: #include <sys/param.h>
28: #include <sys/stat.h>
29:
30: #include <ctype.h>
1.11 xsa 31: #include <errno.h>
1.1 jfb 32: #include <fcntl.h>
33: #include <stdarg.h>
1.11 xsa 34: #include <stdio.h>
35: #include <stdlib.h>
36: #include <string.h>
1.1 jfb 37: #include <unistd.h>
38:
39: #include "buf.h"
40: #include "log.h"
1.19 joris 41: #include "xmalloc.h"
1.1 jfb 42:
1.15 xsa 43: #define BUF_INCR 128
1.1 jfb 44:
45:
46: struct cvs_buf {
1.15 xsa 47: u_int cb_flags;
1.1 jfb 48:
49: /* buffer handle and size */
1.15 xsa 50: u_char *cb_buf;
51: size_t cb_size;
1.1 jfb 52:
53: /* start and length of valid data in buffer */
1.15 xsa 54: u_char *cb_cur;
55: size_t cb_len;
1.1 jfb 56: };
57:
58:
1.16 moritz 59: #define SIZE_LEFT(b) (b->cb_size - (size_t)(b->cb_cur - b->cb_buf) \
60: - b->cb_len)
1.1 jfb 61:
62:
1.15 xsa 63: static ssize_t cvs_buf_grow(BUF *, size_t);
1.1 jfb 64:
65:
66:
67: /*
68: * cvs_buf_alloc()
69: *
70: * Create a new buffer structure and return a pointer to it. This structure
71: * uses dynamically-allocated memory and must be freed with cvs_buf_free(),
72: * once the buffer is no longer needed.
73: */
1.15 xsa 74: BUF *
1.1 jfb 75: cvs_buf_alloc(size_t len, u_int flags)
76: {
77: BUF *b;
78:
1.19 joris 79: b = (BUF *)xmalloc(sizeof(*b));
80: b->cb_buf = xmalloc(len);
1.3 joris 81: memset(b->cb_buf, 0, len);
1.1 jfb 82:
83: b->cb_flags = flags;
84: b->cb_size = len;
1.8 jfb 85: b->cb_cur = b->cb_buf;
1.1 jfb 86: b->cb_len = 0;
87:
88: return (b);
89: }
90:
91:
92: /*
93: * cvs_buf_load()
94: *
95: * Open the file specified by <path> and load all of its contents into a
96: * buffer.
1.20 xsa 97: * Returns the loaded buffer on success.
1.1 jfb 98: */
1.15 xsa 99: BUF *
1.1 jfb 100: cvs_buf_load(const char *path, u_int flags)
101: {
102: int fd;
103: ssize_t ret;
104: size_t len;
1.8 jfb 105: u_char *bp;
1.1 jfb 106: struct stat st;
107: BUF *buf;
108:
1.20 xsa 109: if ((fd = open(path, O_RDONLY, 0600)) == -1)
110: fatal("cvs_buf_load: open: `%s': %s", path, strerror(errno));
1.1 jfb 111:
1.20 xsa 112: if (fstat(fd, &st) == -1)
113: fatal("cvs_buf_load: fstat: %s", strerror(errno));
1.1 jfb 114:
1.25 ! joris 115: buf = cvs_buf_alloc((size_t)st.st_size, flags);
1.1 jfb 116: for (bp = buf->cb_cur; ; bp += (size_t)ret) {
1.16 moritz 117: len = SIZE_LEFT(buf);
1.1 jfb 118: ret = read(fd, bp, len);
119: if (ret == -1) {
1.8 jfb 120: cvs_buf_free(buf);
1.20 xsa 121: fatal("cvs_buf_load: read: %s", strerror(errno));
1.5 deraadt 122: } else if (ret == 0)
1.1 jfb 123: break;
124:
125: buf->cb_len += (size_t)ret;
126: }
127:
128: (void)close(fd);
129:
130: return (buf);
131: }
132:
133:
134: /*
135: * cvs_buf_free()
136: *
137: * Free the buffer <b> and all associated data.
138: */
139: void
140: cvs_buf_free(BUF *b)
141: {
1.19 joris 142: xfree(b->cb_buf);
143: xfree(b);
1.1 jfb 144: }
145:
146:
147: /*
148: * cvs_buf_release()
149: *
150: * Free the buffer <b>'s structural information but do not free the contents
151: * of the buffer. Instead, they are returned and should be freed later using
152: * free().
153: */
1.17 xsa 154: void *
1.1 jfb 155: cvs_buf_release(BUF *b)
156: {
1.8 jfb 157: u_char *tmp;
1.6 tedu 158:
1.1 jfb 159: tmp = b->cb_buf;
1.19 joris 160: xfree(b);
1.1 jfb 161: return (tmp);
162: }
163:
164:
165: /*
166: * cvs_buf_empty()
167: *
168: * Empty the contents of the buffer <b> and reset pointers.
169: */
170: void
171: cvs_buf_empty(BUF *b)
172: {
1.16 moritz 173: memset(b->cb_buf, 0, b->cb_size);
1.8 jfb 174: b->cb_cur = b->cb_buf;
1.1 jfb 175: b->cb_len = 0;
176: }
177:
178:
179: /*
180: * cvs_buf_copy()
181: *
182: * Copy the first <len> bytes of data in the buffer <b> starting at offset
183: * <off> in the destination buffer <dst>, which can accept up to <len> bytes.
184: * Returns the number of bytes successfully copied, or -1 on failure.
185: */
186: ssize_t
187: cvs_buf_copy(BUF *b, size_t off, void *dst, size_t len)
188: {
189: size_t rc;
190:
191: if (off > b->cb_len)
1.21 xsa 192: fatal("cvs_buf_copy failed");
1.1 jfb 193:
194: rc = MIN(len, (b->cb_len - off));
1.16 moritz 195: memcpy(dst, b->cb_buf + off, rc);
1.1 jfb 196:
197: return (ssize_t)rc;
198: }
199:
200:
201: /*
202: * cvs_buf_set()
203: *
1.16 moritz 204: * Set the contents of the buffer <b> at offset <off> to the first <len>
205: * bytes of data found at <src>. If the buffer was not created with
206: * BUF_AUTOEXT, as many bytes as possible will be copied in the buffer.
1.1 jfb 207: */
1.16 moritz 208: ssize_t
1.1 jfb 209: cvs_buf_set(BUF *b, const void *src, size_t len, size_t off)
210: {
1.23 xsa 211: size_t rlen = 0;
1.1 jfb 212:
213: if (b->cb_size < (len + off)) {
1.20 xsa 214: if ((b->cb_flags & BUF_AUTOEXT) &&
215: (cvs_buf_grow(b, len + off - b->cb_size) < 0))
216: fatal("cvs_buf_set failed");
1.1 jfb 217: else
218: rlen = b->cb_size - off;
1.5 deraadt 219: } else
1.1 jfb 220: rlen = len;
221:
222: memcpy((b->cb_buf + off), src, rlen);
223:
224: if (b->cb_len == 0) {
225: b->cb_cur = b->cb_buf + off;
226: b->cb_len = rlen;
227: }
228:
1.16 moritz 229: return (rlen);
1.1 jfb 230: }
231:
232:
233: /*
234: * cvs_buf_putc()
235: *
236: * Append a single character <c> to the end of the buffer <b>.
1.21 xsa 237: * Returns 0 on success.
1.1 jfb 238: */
239: int
240: cvs_buf_putc(BUF *b, int c)
241: {
242: u_char *bp;
243:
244: bp = b->cb_cur + b->cb_len;
245: if (bp == (b->cb_buf + b->cb_size)) {
246: /* extend */
247: if (!(b->cb_flags & BUF_AUTOEXT) ||
1.18 xsa 248: (cvs_buf_grow(b, (size_t)BUF_INCR) < 0))
1.21 xsa 249: fatal("cvs_buf_putc failed");
1.1 jfb 250:
251: /* the buffer might have been moved */
252: bp = b->cb_cur + b->cb_len;
253: }
254: *bp = (u_char)c;
255: b->cb_len++;
256:
257: return (0);
258: }
259:
260:
261: /*
262: * cvs_buf_append()
263: *
264: * Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
265: * buffer is too small to accept all data, it will attempt to append as much
266: * data as possible, or if the BUF_AUTOEXT flag is set for the buffer, it
267: * will get resized to an appropriate size to accept all data.
268: * Returns the number of bytes successfully appended to the buffer, or -1
269: * on failure.
270: */
271: ssize_t
272: cvs_buf_append(BUF *b, const void *data, size_t len)
273: {
274: size_t left, rlen;
1.8 jfb 275: u_char *bp, *bep;
1.1 jfb 276:
277: bp = b->cb_cur + b->cb_len;
278: bep = b->cb_buf + b->cb_size;
279: left = bep - bp;
280: rlen = len;
281:
282: if (left < len) {
283: if (b->cb_flags & BUF_AUTOEXT) {
284: if (cvs_buf_grow(b, len - left) < 0)
1.20 xsa 285: fatal("cvs_buf_append failed");
1.1 jfb 286: bp = b->cb_cur + b->cb_len;
1.5 deraadt 287: } else
1.1 jfb 288: rlen = bep - bp;
289: }
290:
291: memcpy(bp, data, rlen);
292: b->cb_len += rlen;
293:
294: return (rlen);
295: }
296:
297:
298: /*
299: * cvs_buf_fappend()
300: *
301: */
302: int
303: cvs_buf_fappend(BUF *b, const char *fmt, ...)
304: {
305: int ret;
306: char *str;
307: va_list vap;
308:
309: va_start(vap, fmt);
1.4 pat 310: ret = vasprintf(&str, fmt, vap);
311: va_end(vap);
1.1 jfb 312:
1.20 xsa 313: if (ret == -1)
314: fatal("cvs_buf_fappend: failed to format data");
1.1 jfb 315:
1.18 xsa 316: ret = cvs_buf_append(b, str, (size_t)ret);
1.19 joris 317: xfree(str);
1.1 jfb 318: return (ret);
319: }
320:
321:
322: /*
1.16 moritz 323: * cvs_buf_len()
1.1 jfb 324: *
325: * Returns the size of the buffer that is being used.
326: */
327: size_t
1.16 moritz 328: cvs_buf_len(BUF *b)
1.1 jfb 329: {
330: return (b->cb_len);
331: }
332:
333:
334: /*
335: * cvs_buf_peek()
336: *
337: * Peek at the contents of the buffer <b> at offset <off>.
338: */
1.17 xsa 339: const void *
1.1 jfb 340: cvs_buf_peek(BUF *b, size_t off)
341: {
342: if (off >= b->cb_len)
343: return (NULL);
344:
345: return (b->cb_buf + off);
346: }
347:
348:
349: /*
1.7 djm 350: * cvs_buf_write_fd()
1.1 jfb 351: *
1.7 djm 352: * Write the contents of the buffer <b> to the specified <fd>
1.1 jfb 353: */
354: int
1.7 djm 355: cvs_buf_write_fd(BUF *b, int fd)
1.1 jfb 356: {
357: u_char *bp;
358: size_t len;
359: ssize_t ret;
360:
361: len = b->cb_len;
362: bp = b->cb_cur;
363:
364: do {
1.16 moritz 365: ret = write(fd, bp, len);
1.1 jfb 366: if (ret == -1) {
1.7 djm 367: if (errno == EINTR || errno == EAGAIN)
368: continue;
1.22 xsa 369: return (-1);
1.1 jfb 370: }
371:
372: len -= (size_t)ret;
373: bp += (size_t)ret;
374: } while (len > 0);
375:
1.7 djm 376: return (0);
377: }
378:
379: /*
380: * cvs_buf_write()
381: *
382: * Write the contents of the buffer <b> to the file whose path is given in
383: * <path>. If the file does not exist, it is created with mode <mode>.
384: */
385:
386: int
387: cvs_buf_write(BUF *b, const char *path, mode_t mode)
388: {
1.22 xsa 389: int fd;
1.7 djm 390:
1.20 xsa 391: if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1)
392: fatal("open: `%s': %s", path, strerror(errno));
1.7 djm 393:
1.22 xsa 394: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 395: (void)unlink(path);
1.22 xsa 396: fatal("cvs_buf_write: cvs_buf_write_fd: `%s'", path);
1.7 djm 397: }
1.1 jfb 398: (void)close(fd);
1.24 joris 399:
400: if (chmod(path, mode) < 0)
401: fatal("cvs_buf_write: chmod failed: %s", strerror(errno));
1.1 jfb 402:
1.22 xsa 403: return (0);
1.1 jfb 404: }
405:
1.7 djm 406: /*
407: * cvs_buf_write_stmp()
408: *
1.13 joris 409: * Write the contents of the buffer <b> to a temporary file whose path is
1.7 djm 410: * specified using <template> (see mkstemp.3). NB. This function will modify
411: * <template>, as per mkstemp
412: */
413:
414: int
415: cvs_buf_write_stmp(BUF *b, char *template, mode_t mode)
416: {
1.22 xsa 417: int fd;
1.7 djm 418:
1.20 xsa 419: if ((fd = mkstemp(template)) == -1)
420: fatal("mkstemp: `%s': %s", template, strerror(errno));
1.7 djm 421:
1.22 xsa 422: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 423: (void)unlink(template);
1.22 xsa 424: fatal("cvs_buf_write_stmp: cvs_buf_write_fd: `%s'", template);
1.7 djm 425: }
426: (void)close(fd);
427:
1.22 xsa 428: return (0);
1.7 djm 429: }
1.1 jfb 430:
431: /*
432: * cvs_buf_grow()
433: *
434: * Grow the buffer <b> by <len> bytes. The contents are unchanged by this
435: * operation regardless of the result.
436: * Returns the new size on success, or -1 on failure.
437: */
438: static ssize_t
439: cvs_buf_grow(BUF *b, size_t len)
440: {
441: void *tmp;
442: size_t diff;
443:
1.8 jfb 444: diff = b->cb_cur - b->cb_buf;
1.19 joris 445: tmp = xrealloc(b->cb_buf, b->cb_size + len);
1.1 jfb 446: b->cb_buf = (u_char *)tmp;
447: b->cb_size += len;
448:
449: /* readjust pointers in case the buffer moved in memory */
450: b->cb_cur = b->cb_buf + diff;
451:
452: return (ssize_t)b->cb_size;
453: }
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