Annotation of src/usr.bin/cvs/buf.c, Revision 1.29
1.29 ! niallo 1: /* $OpenBSD: buf.c,v 1.28 2006/01/02 08:11:56 xsa 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:
1.28 xsa 27: #include "includes.h"
1.1 jfb 28:
29: #include "buf.h"
30: #include "log.h"
1.19 joris 31: #include "xmalloc.h"
1.1 jfb 32:
1.15 xsa 33: #define BUF_INCR 128
1.1 jfb 34:
35: struct cvs_buf {
1.15 xsa 36: u_int cb_flags;
1.1 jfb 37:
38: /* buffer handle and size */
1.15 xsa 39: u_char *cb_buf;
40: size_t cb_size;
1.1 jfb 41:
42: /* start and length of valid data in buffer */
1.15 xsa 43: u_char *cb_cur;
44: size_t cb_len;
1.1 jfb 45: };
46:
1.16 moritz 47: #define SIZE_LEFT(b) (b->cb_size - (size_t)(b->cb_cur - b->cb_buf) \
48: - b->cb_len)
1.1 jfb 49:
1.15 xsa 50: static ssize_t cvs_buf_grow(BUF *, size_t);
1.1 jfb 51:
52: /*
53: * cvs_buf_alloc()
54: *
55: * Create a new buffer structure and return a pointer to it. This structure
56: * uses dynamically-allocated memory and must be freed with cvs_buf_free(),
57: * once the buffer is no longer needed.
58: */
1.15 xsa 59: BUF *
1.1 jfb 60: cvs_buf_alloc(size_t len, u_int flags)
61: {
62: BUF *b;
63:
1.19 joris 64: b = (BUF *)xmalloc(sizeof(*b));
65: b->cb_buf = xmalloc(len);
1.3 joris 66: memset(b->cb_buf, 0, len);
1.1 jfb 67:
68: b->cb_flags = flags;
69: b->cb_size = len;
1.8 jfb 70: b->cb_cur = b->cb_buf;
1.1 jfb 71: b->cb_len = 0;
72:
73: return (b);
74: }
75:
76: /*
77: * cvs_buf_load()
78: *
79: * Open the file specified by <path> and load all of its contents into a
80: * buffer.
1.20 xsa 81: * Returns the loaded buffer on success.
1.1 jfb 82: */
1.15 xsa 83: BUF *
1.1 jfb 84: cvs_buf_load(const char *path, u_int flags)
85: {
86: int fd;
87: ssize_t ret;
88: size_t len;
1.8 jfb 89: u_char *bp;
1.1 jfb 90: struct stat st;
91: BUF *buf;
92:
1.20 xsa 93: if ((fd = open(path, O_RDONLY, 0600)) == -1)
94: fatal("cvs_buf_load: open: `%s': %s", path, strerror(errno));
1.1 jfb 95:
1.20 xsa 96: if (fstat(fd, &st) == -1)
97: fatal("cvs_buf_load: fstat: %s", strerror(errno));
1.1 jfb 98:
1.25 joris 99: buf = cvs_buf_alloc((size_t)st.st_size, flags);
1.1 jfb 100: for (bp = buf->cb_cur; ; bp += (size_t)ret) {
1.16 moritz 101: len = SIZE_LEFT(buf);
1.1 jfb 102: ret = read(fd, bp, len);
103: if (ret == -1) {
1.8 jfb 104: cvs_buf_free(buf);
1.20 xsa 105: fatal("cvs_buf_load: read: %s", strerror(errno));
1.5 deraadt 106: } else if (ret == 0)
1.1 jfb 107: break;
108:
109: buf->cb_len += (size_t)ret;
110: }
111:
112: (void)close(fd);
113:
114: return (buf);
115: }
116:
117: /*
118: * cvs_buf_free()
119: *
120: * Free the buffer <b> and all associated data.
121: */
122: void
123: cvs_buf_free(BUF *b)
124: {
1.19 joris 125: xfree(b->cb_buf);
126: xfree(b);
1.1 jfb 127: }
128:
129: /*
130: * cvs_buf_release()
131: *
132: * Free the buffer <b>'s structural information but do not free the contents
133: * of the buffer. Instead, they are returned and should be freed later using
134: * free().
135: */
1.17 xsa 136: void *
1.1 jfb 137: cvs_buf_release(BUF *b)
138: {
1.8 jfb 139: u_char *tmp;
1.6 tedu 140:
1.1 jfb 141: tmp = b->cb_buf;
1.19 joris 142: xfree(b);
1.1 jfb 143: return (tmp);
144: }
145:
146: /*
147: * cvs_buf_empty()
148: *
149: * Empty the contents of the buffer <b> and reset pointers.
150: */
151: void
152: cvs_buf_empty(BUF *b)
153: {
1.16 moritz 154: memset(b->cb_buf, 0, b->cb_size);
1.8 jfb 155: b->cb_cur = b->cb_buf;
1.1 jfb 156: b->cb_len = 0;
157: }
158:
159: /*
160: * cvs_buf_copy()
161: *
162: * Copy the first <len> bytes of data in the buffer <b> starting at offset
163: * <off> in the destination buffer <dst>, which can accept up to <len> bytes.
164: * Returns the number of bytes successfully copied, or -1 on failure.
165: */
166: ssize_t
167: cvs_buf_copy(BUF *b, size_t off, void *dst, size_t len)
168: {
169: size_t rc;
170:
171: if (off > b->cb_len)
1.21 xsa 172: fatal("cvs_buf_copy failed");
1.1 jfb 173:
174: rc = MIN(len, (b->cb_len - off));
1.16 moritz 175: memcpy(dst, b->cb_buf + off, rc);
1.1 jfb 176:
177: return (ssize_t)rc;
178: }
179:
180: /*
181: * cvs_buf_set()
182: *
1.16 moritz 183: * Set the contents of the buffer <b> at offset <off> to the first <len>
184: * bytes of data found at <src>. If the buffer was not created with
185: * BUF_AUTOEXT, as many bytes as possible will be copied in the buffer.
1.1 jfb 186: */
1.16 moritz 187: ssize_t
1.1 jfb 188: cvs_buf_set(BUF *b, const void *src, size_t len, size_t off)
189: {
1.23 xsa 190: size_t rlen = 0;
1.1 jfb 191:
192: if (b->cb_size < (len + off)) {
1.20 xsa 193: if ((b->cb_flags & BUF_AUTOEXT) &&
194: (cvs_buf_grow(b, len + off - b->cb_size) < 0))
195: fatal("cvs_buf_set failed");
1.1 jfb 196: else
197: rlen = b->cb_size - off;
1.5 deraadt 198: } else
1.1 jfb 199: rlen = len;
200:
201: memcpy((b->cb_buf + off), src, rlen);
202:
203: if (b->cb_len == 0) {
204: b->cb_cur = b->cb_buf + off;
205: b->cb_len = rlen;
206: }
207:
1.16 moritz 208: return (rlen);
1.1 jfb 209: }
210:
211: /*
212: * cvs_buf_putc()
213: *
214: * Append a single character <c> to the end of the buffer <b>.
1.21 xsa 215: * Returns 0 on success.
1.1 jfb 216: */
217: int
218: cvs_buf_putc(BUF *b, int c)
219: {
220: u_char *bp;
221:
222: bp = b->cb_cur + b->cb_len;
223: if (bp == (b->cb_buf + b->cb_size)) {
224: /* extend */
225: if (!(b->cb_flags & BUF_AUTOEXT) ||
1.18 xsa 226: (cvs_buf_grow(b, (size_t)BUF_INCR) < 0))
1.21 xsa 227: fatal("cvs_buf_putc failed");
1.1 jfb 228:
229: /* the buffer might have been moved */
230: bp = b->cb_cur + b->cb_len;
231: }
232: *bp = (u_char)c;
233: b->cb_len++;
234:
235: return (0);
1.29 ! niallo 236: }
! 237:
! 238: /*
! 239: * cvs_buf_getc()
! 240: *
! 241: * Return u_char at buffer position <pos>.
! 242: *
! 243: */
! 244: u_char
! 245: cvs_buf_getc(BUF *b, u_int pos)
! 246: {
! 247: return (b->cb_cur[pos]);
1.1 jfb 248: }
249:
250: /*
251: * cvs_buf_append()
252: *
253: * Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
254: * buffer is too small to accept all data, it will attempt to append as much
255: * data as possible, or if the BUF_AUTOEXT flag is set for the buffer, it
256: * will get resized to an appropriate size to accept all data.
1.27 joris 257: * Returns the number of bytes successfully appended to the buffer.
1.1 jfb 258: */
259: ssize_t
260: cvs_buf_append(BUF *b, const void *data, size_t len)
261: {
262: size_t left, rlen;
1.8 jfb 263: u_char *bp, *bep;
1.1 jfb 264:
265: bp = b->cb_cur + b->cb_len;
266: bep = b->cb_buf + b->cb_size;
267: left = bep - bp;
268: rlen = len;
269:
270: if (left < len) {
271: if (b->cb_flags & BUF_AUTOEXT) {
272: if (cvs_buf_grow(b, len - left) < 0)
1.20 xsa 273: fatal("cvs_buf_append failed");
1.1 jfb 274: bp = b->cb_cur + b->cb_len;
1.5 deraadt 275: } else
1.1 jfb 276: rlen = bep - bp;
277: }
278:
279: memcpy(bp, data, rlen);
280: b->cb_len += rlen;
281:
282: return (rlen);
283: }
284:
285: /*
286: * cvs_buf_fappend()
287: *
288: */
289: int
290: cvs_buf_fappend(BUF *b, const char *fmt, ...)
291: {
292: int ret;
293: char *str;
294: va_list vap;
295:
296: va_start(vap, fmt);
1.4 pat 297: ret = vasprintf(&str, fmt, vap);
298: va_end(vap);
1.1 jfb 299:
1.20 xsa 300: if (ret == -1)
301: fatal("cvs_buf_fappend: failed to format data");
1.1 jfb 302:
1.18 xsa 303: ret = cvs_buf_append(b, str, (size_t)ret);
1.19 joris 304: xfree(str);
1.1 jfb 305: return (ret);
306: }
307:
308: /*
1.16 moritz 309: * cvs_buf_len()
1.1 jfb 310: *
311: * Returns the size of the buffer that is being used.
312: */
313: size_t
1.16 moritz 314: cvs_buf_len(BUF *b)
1.1 jfb 315: {
316: return (b->cb_len);
317: }
318:
319: /*
320: * cvs_buf_peek()
321: *
322: * Peek at the contents of the buffer <b> at offset <off>.
323: */
1.17 xsa 324: const void *
1.1 jfb 325: cvs_buf_peek(BUF *b, size_t off)
326: {
327: if (off >= b->cb_len)
328: return (NULL);
329:
330: return (b->cb_buf + off);
331: }
332:
333: /*
1.7 djm 334: * cvs_buf_write_fd()
1.1 jfb 335: *
1.7 djm 336: * Write the contents of the buffer <b> to the specified <fd>
1.1 jfb 337: */
338: int
1.7 djm 339: cvs_buf_write_fd(BUF *b, int fd)
1.1 jfb 340: {
341: u_char *bp;
342: size_t len;
343: ssize_t ret;
344:
345: len = b->cb_len;
346: bp = b->cb_cur;
347:
348: do {
1.16 moritz 349: ret = write(fd, bp, len);
1.1 jfb 350: if (ret == -1) {
1.7 djm 351: if (errno == EINTR || errno == EAGAIN)
352: continue;
1.22 xsa 353: return (-1);
1.1 jfb 354: }
355:
356: len -= (size_t)ret;
357: bp += (size_t)ret;
358: } while (len > 0);
359:
1.7 djm 360: return (0);
361: }
362:
363: /*
364: * cvs_buf_write()
365: *
366: * Write the contents of the buffer <b> to the file whose path is given in
367: * <path>. If the file does not exist, it is created with mode <mode>.
368: */
369: int
370: cvs_buf_write(BUF *b, const char *path, mode_t mode)
371: {
1.22 xsa 372: int fd;
1.7 djm 373:
1.20 xsa 374: if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1)
375: fatal("open: `%s': %s", path, strerror(errno));
1.7 djm 376:
1.22 xsa 377: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 378: (void)unlink(path);
1.22 xsa 379: fatal("cvs_buf_write: cvs_buf_write_fd: `%s'", path);
1.7 djm 380: }
1.1 jfb 381: (void)close(fd);
1.24 joris 382:
383: if (chmod(path, mode) < 0)
384: fatal("cvs_buf_write: chmod failed: %s", strerror(errno));
1.1 jfb 385:
1.22 xsa 386: return (0);
1.1 jfb 387: }
388:
1.7 djm 389: /*
390: * cvs_buf_write_stmp()
391: *
1.13 joris 392: * Write the contents of the buffer <b> to a temporary file whose path is
1.7 djm 393: * specified using <template> (see mkstemp.3). NB. This function will modify
394: * <template>, as per mkstemp
395: */
396: int
397: cvs_buf_write_stmp(BUF *b, char *template, mode_t mode)
398: {
1.22 xsa 399: int fd;
1.7 djm 400:
1.20 xsa 401: if ((fd = mkstemp(template)) == -1)
402: fatal("mkstemp: `%s': %s", template, strerror(errno));
1.7 djm 403:
1.22 xsa 404: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 405: (void)unlink(template);
1.22 xsa 406: fatal("cvs_buf_write_stmp: cvs_buf_write_fd: `%s'", template);
1.7 djm 407: }
408: (void)close(fd);
409:
1.22 xsa 410: return (0);
1.7 djm 411: }
1.1 jfb 412:
413: /*
414: * cvs_buf_grow()
415: *
416: * Grow the buffer <b> by <len> bytes. The contents are unchanged by this
417: * operation regardless of the result.
418: * Returns the new size on success, or -1 on failure.
419: */
420: static ssize_t
421: cvs_buf_grow(BUF *b, size_t len)
422: {
423: void *tmp;
424: size_t diff;
425:
1.8 jfb 426: diff = b->cb_cur - b->cb_buf;
1.19 joris 427: tmp = xrealloc(b->cb_buf, b->cb_size + len);
1.1 jfb 428: b->cb_buf = (u_char *)tmp;
429: b->cb_size += len;
430:
431: /* readjust pointers in case the buffer moved in memory */
432: b->cb_cur = b->cb_buf + diff;
433:
434: return (ssize_t)b->cb_size;
435: }
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