Annotation of src/usr.bin/cvs/buf.c, Revision 1.26
1.26 ! joris 1: /* $OpenBSD: buf.c,v 1.25 2005/12/24 04:10:51 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: struct cvs_buf {
1.15 xsa 46: u_int cb_flags;
1.1 jfb 47:
48: /* buffer handle and size */
1.15 xsa 49: u_char *cb_buf;
50: size_t cb_size;
1.1 jfb 51:
52: /* start and length of valid data in buffer */
1.15 xsa 53: u_char *cb_cur;
54: size_t cb_len;
1.1 jfb 55: };
56:
1.16 moritz 57: #define SIZE_LEFT(b) (b->cb_size - (size_t)(b->cb_cur - b->cb_buf) \
58: - b->cb_len)
1.1 jfb 59:
1.15 xsa 60: static ssize_t cvs_buf_grow(BUF *, size_t);
1.1 jfb 61:
62: /*
63: * cvs_buf_alloc()
64: *
65: * Create a new buffer structure and return a pointer to it. This structure
66: * uses dynamically-allocated memory and must be freed with cvs_buf_free(),
67: * once the buffer is no longer needed.
68: */
1.15 xsa 69: BUF *
1.1 jfb 70: cvs_buf_alloc(size_t len, u_int flags)
71: {
72: BUF *b;
73:
1.19 joris 74: b = (BUF *)xmalloc(sizeof(*b));
75: b->cb_buf = xmalloc(len);
1.3 joris 76: memset(b->cb_buf, 0, len);
1.1 jfb 77:
78: b->cb_flags = flags;
79: b->cb_size = len;
1.8 jfb 80: b->cb_cur = b->cb_buf;
1.1 jfb 81: b->cb_len = 0;
82:
83: return (b);
84: }
85:
86: /*
87: * cvs_buf_load()
88: *
89: * Open the file specified by <path> and load all of its contents into a
90: * buffer.
1.20 xsa 91: * Returns the loaded buffer on success.
1.1 jfb 92: */
1.15 xsa 93: BUF *
1.1 jfb 94: cvs_buf_load(const char *path, u_int flags)
95: {
96: int fd;
97: ssize_t ret;
98: size_t len;
1.8 jfb 99: u_char *bp;
1.1 jfb 100: struct stat st;
101: BUF *buf;
102:
1.20 xsa 103: if ((fd = open(path, O_RDONLY, 0600)) == -1)
104: fatal("cvs_buf_load: open: `%s': %s", path, strerror(errno));
1.1 jfb 105:
1.20 xsa 106: if (fstat(fd, &st) == -1)
107: fatal("cvs_buf_load: fstat: %s", strerror(errno));
1.1 jfb 108:
1.25 joris 109: buf = cvs_buf_alloc((size_t)st.st_size, flags);
1.1 jfb 110: for (bp = buf->cb_cur; ; bp += (size_t)ret) {
1.16 moritz 111: len = SIZE_LEFT(buf);
1.1 jfb 112: ret = read(fd, bp, len);
113: if (ret == -1) {
1.8 jfb 114: cvs_buf_free(buf);
1.20 xsa 115: fatal("cvs_buf_load: read: %s", strerror(errno));
1.5 deraadt 116: } else if (ret == 0)
1.1 jfb 117: break;
118:
119: buf->cb_len += (size_t)ret;
120: }
121:
122: (void)close(fd);
123:
124: return (buf);
125: }
126:
127: /*
128: * cvs_buf_free()
129: *
130: * Free the buffer <b> and all associated data.
131: */
132: void
133: cvs_buf_free(BUF *b)
134: {
1.19 joris 135: xfree(b->cb_buf);
136: xfree(b);
1.1 jfb 137: }
138:
139: /*
140: * cvs_buf_release()
141: *
142: * Free the buffer <b>'s structural information but do not free the contents
143: * of the buffer. Instead, they are returned and should be freed later using
144: * free().
145: */
1.17 xsa 146: void *
1.1 jfb 147: cvs_buf_release(BUF *b)
148: {
1.8 jfb 149: u_char *tmp;
1.6 tedu 150:
1.1 jfb 151: tmp = b->cb_buf;
1.19 joris 152: xfree(b);
1.1 jfb 153: return (tmp);
154: }
155:
156: /*
157: * cvs_buf_empty()
158: *
159: * Empty the contents of the buffer <b> and reset pointers.
160: */
161: void
162: cvs_buf_empty(BUF *b)
163: {
1.16 moritz 164: memset(b->cb_buf, 0, b->cb_size);
1.8 jfb 165: b->cb_cur = b->cb_buf;
1.1 jfb 166: b->cb_len = 0;
167: }
168:
169: /*
170: * cvs_buf_copy()
171: *
172: * Copy the first <len> bytes of data in the buffer <b> starting at offset
173: * <off> in the destination buffer <dst>, which can accept up to <len> bytes.
174: * Returns the number of bytes successfully copied, or -1 on failure.
175: */
176: ssize_t
177: cvs_buf_copy(BUF *b, size_t off, void *dst, size_t len)
178: {
179: size_t rc;
180:
181: if (off > b->cb_len)
1.21 xsa 182: fatal("cvs_buf_copy failed");
1.1 jfb 183:
184: rc = MIN(len, (b->cb_len - off));
1.16 moritz 185: memcpy(dst, b->cb_buf + off, rc);
1.1 jfb 186:
187: return (ssize_t)rc;
188: }
189:
190: /*
191: * cvs_buf_set()
192: *
1.16 moritz 193: * Set the contents of the buffer <b> at offset <off> to the first <len>
194: * bytes of data found at <src>. If the buffer was not created with
195: * BUF_AUTOEXT, as many bytes as possible will be copied in the buffer.
1.1 jfb 196: */
1.16 moritz 197: ssize_t
1.1 jfb 198: cvs_buf_set(BUF *b, const void *src, size_t len, size_t off)
199: {
1.23 xsa 200: size_t rlen = 0;
1.1 jfb 201:
202: if (b->cb_size < (len + off)) {
1.20 xsa 203: if ((b->cb_flags & BUF_AUTOEXT) &&
204: (cvs_buf_grow(b, len + off - b->cb_size) < 0))
205: fatal("cvs_buf_set failed");
1.1 jfb 206: else
207: rlen = b->cb_size - off;
1.5 deraadt 208: } else
1.1 jfb 209: rlen = len;
210:
211: memcpy((b->cb_buf + off), src, rlen);
212:
213: if (b->cb_len == 0) {
214: b->cb_cur = b->cb_buf + off;
215: b->cb_len = rlen;
216: }
217:
1.16 moritz 218: return (rlen);
1.1 jfb 219: }
220:
221: /*
222: * cvs_buf_putc()
223: *
224: * Append a single character <c> to the end of the buffer <b>.
1.21 xsa 225: * Returns 0 on success.
1.1 jfb 226: */
227: int
228: cvs_buf_putc(BUF *b, int c)
229: {
230: u_char *bp;
231:
232: bp = b->cb_cur + b->cb_len;
233: if (bp == (b->cb_buf + b->cb_size)) {
234: /* extend */
235: if (!(b->cb_flags & BUF_AUTOEXT) ||
1.18 xsa 236: (cvs_buf_grow(b, (size_t)BUF_INCR) < 0))
1.21 xsa 237: fatal("cvs_buf_putc failed");
1.1 jfb 238:
239: /* the buffer might have been moved */
240: bp = b->cb_cur + b->cb_len;
241: }
242: *bp = (u_char)c;
243: b->cb_len++;
244:
245: return (0);
246: }
247:
248: /*
249: * cvs_buf_append()
250: *
251: * Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
252: * buffer is too small to accept all data, it will attempt to append as much
253: * data as possible, or if the BUF_AUTOEXT flag is set for the buffer, it
254: * will get resized to an appropriate size to accept all data.
255: * Returns the number of bytes successfully appended to the buffer, or -1
256: * on failure.
257: */
258: ssize_t
259: cvs_buf_append(BUF *b, const void *data, size_t len)
260: {
261: size_t left, rlen;
1.8 jfb 262: u_char *bp, *bep;
1.1 jfb 263:
264: bp = b->cb_cur + b->cb_len;
265: bep = b->cb_buf + b->cb_size;
266: left = bep - bp;
267: rlen = len;
268:
269: if (left < len) {
270: if (b->cb_flags & BUF_AUTOEXT) {
271: if (cvs_buf_grow(b, len - left) < 0)
1.20 xsa 272: fatal("cvs_buf_append failed");
1.1 jfb 273: bp = b->cb_cur + b->cb_len;
1.5 deraadt 274: } else
1.1 jfb 275: rlen = bep - bp;
276: }
277:
278: memcpy(bp, data, rlen);
279: b->cb_len += rlen;
280:
281: return (rlen);
282: }
283:
284: /*
285: * cvs_buf_fappend()
286: *
287: */
288: int
289: cvs_buf_fappend(BUF *b, const char *fmt, ...)
290: {
291: int ret;
292: char *str;
293: va_list vap;
294:
295: va_start(vap, fmt);
1.4 pat 296: ret = vasprintf(&str, fmt, vap);
297: va_end(vap);
1.1 jfb 298:
1.20 xsa 299: if (ret == -1)
300: fatal("cvs_buf_fappend: failed to format data");
1.1 jfb 301:
1.18 xsa 302: ret = cvs_buf_append(b, str, (size_t)ret);
1.19 joris 303: xfree(str);
1.1 jfb 304: return (ret);
305: }
306:
307: /*
1.16 moritz 308: * cvs_buf_len()
1.1 jfb 309: *
310: * Returns the size of the buffer that is being used.
311: */
312: size_t
1.16 moritz 313: cvs_buf_len(BUF *b)
1.1 jfb 314: {
315: return (b->cb_len);
316: }
317:
318: /*
319: * cvs_buf_peek()
320: *
321: * Peek at the contents of the buffer <b> at offset <off>.
322: */
1.17 xsa 323: const void *
1.1 jfb 324: cvs_buf_peek(BUF *b, size_t off)
325: {
326: if (off >= b->cb_len)
327: return (NULL);
328:
329: return (b->cb_buf + off);
330: }
331:
332: /*
1.7 djm 333: * cvs_buf_write_fd()
1.1 jfb 334: *
1.7 djm 335: * Write the contents of the buffer <b> to the specified <fd>
1.1 jfb 336: */
337: int
1.7 djm 338: cvs_buf_write_fd(BUF *b, int fd)
1.1 jfb 339: {
340: u_char *bp;
341: size_t len;
342: ssize_t ret;
343:
344: len = b->cb_len;
345: bp = b->cb_cur;
346:
347: do {
1.16 moritz 348: ret = write(fd, bp, len);
1.1 jfb 349: if (ret == -1) {
1.7 djm 350: if (errno == EINTR || errno == EAGAIN)
351: continue;
1.22 xsa 352: return (-1);
1.1 jfb 353: }
354:
355: len -= (size_t)ret;
356: bp += (size_t)ret;
357: } while (len > 0);
358:
1.7 djm 359: return (0);
360: }
361:
362: /*
363: * cvs_buf_write()
364: *
365: * Write the contents of the buffer <b> to the file whose path is given in
366: * <path>. If the file does not exist, it is created with mode <mode>.
367: */
368: int
369: cvs_buf_write(BUF *b, const char *path, mode_t mode)
370: {
1.22 xsa 371: int fd;
1.7 djm 372:
1.20 xsa 373: if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1)
374: fatal("open: `%s': %s", path, strerror(errno));
1.7 djm 375:
1.22 xsa 376: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 377: (void)unlink(path);
1.22 xsa 378: fatal("cvs_buf_write: cvs_buf_write_fd: `%s'", path);
1.7 djm 379: }
1.1 jfb 380: (void)close(fd);
1.24 joris 381:
382: if (chmod(path, mode) < 0)
383: fatal("cvs_buf_write: chmod failed: %s", strerror(errno));
1.1 jfb 384:
1.22 xsa 385: return (0);
1.1 jfb 386: }
387:
1.7 djm 388: /*
389: * cvs_buf_write_stmp()
390: *
1.13 joris 391: * Write the contents of the buffer <b> to a temporary file whose path is
1.7 djm 392: * specified using <template> (see mkstemp.3). NB. This function will modify
393: * <template>, as per mkstemp
394: */
395: int
396: cvs_buf_write_stmp(BUF *b, char *template, mode_t mode)
397: {
1.22 xsa 398: int fd;
1.7 djm 399:
1.20 xsa 400: if ((fd = mkstemp(template)) == -1)
401: fatal("mkstemp: `%s': %s", template, strerror(errno));
1.7 djm 402:
1.22 xsa 403: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 404: (void)unlink(template);
1.22 xsa 405: fatal("cvs_buf_write_stmp: cvs_buf_write_fd: `%s'", template);
1.7 djm 406: }
407: (void)close(fd);
408:
1.22 xsa 409: return (0);
1.7 djm 410: }
1.1 jfb 411:
412: /*
413: * cvs_buf_grow()
414: *
415: * Grow the buffer <b> by <len> bytes. The contents are unchanged by this
416: * operation regardless of the result.
417: * Returns the new size on success, or -1 on failure.
418: */
419: static ssize_t
420: cvs_buf_grow(BUF *b, size_t len)
421: {
422: void *tmp;
423: size_t diff;
424:
1.8 jfb 425: diff = b->cb_cur - b->cb_buf;
1.19 joris 426: tmp = xrealloc(b->cb_buf, b->cb_size + len);
1.1 jfb 427: b->cb_buf = (u_char *)tmp;
428: b->cb_size += len;
429:
430: /* readjust pointers in case the buffer moved in memory */
431: b->cb_cur = b->cb_buf + diff;
432:
433: return (ssize_t)b->cb_size;
434: }
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